Korea Electric Power (KEP) 20-F 29 Apr 20 2019 FY Annual report (foreign) Financial data

Document And Entity Information

Document And Entity Information	12 Months Ended
	Dec. 31, 2019shares
Document and entity information [Abstract]
Entity Registrant Name	KOREA ELECTRIC POWER CORP
Trading Symbol	KEP
Entity Central Index Key	0000887225
Document Type	20-F
Document Period End Date	Dec. 31, 2019
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding	641,964,077
Entity Interactive Data Current	Yes
Document Annual Report	true
Document Transition Report	false
Document Shell Company Report	false
Document Registration Statement	false
Security 12b Title	American Depositary Shares
Security Exchange Name	NYSE

Consolidated Statements Of Fina

Consolidated Statements Of Financial Position - KRW (₩) ₩ in Millions		Dec. 31, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents (Notes 5,6,7 and 45)		₩ 1,810,129	₩ 1,358,345
Current financial assets, net (Notes 5,6,9,11,12,13 and 45)		1,586,509	2,359,895
Trade and other receivables, net (Notes 5,8,20,24,45,46 and 47)		7,701,452	7,793,592
Inventories, net (Note 14)		7,050,700	7,188,253
Income tax refund receivables (Note 41)		99,718	143,214
Current non-financial assets (Note 15)		1,206,377	878,888
Assets held for sale (Note 42)		28,116	22,881
Total current assets		19,483,001	19,745,068
Non-current assets
Non-current financial assets, net (Notes 5,6,9,10,11,12,13 and 45)		2,563,498	2,113,613
Non-current trade and other receivables, net (Notes 5,8,20,45,46 and 47)		2,002,297	1,819,845
Property, plant and equipment, net (Notes 18,24,27 and 49)		164,701,827	152,743,194
Investment properties, net (Notes 19 and 27)		158,580	159,559
Goodwill (Notes 16 and 51)		97,977	2,582
Intangible assets other than goodwill, net (Notes 21,27 and 46)		1,069,976	1,225,942
Investments in associates (Notes 4 and 17)		4,251,802	4,064,820
Investments in joint ventures (Notes 4 and 17)		1,663,029	1,813,525
Defined benefit assets, net (Note 25)		1,047	0
Deferred tax assets (Note 41)		1,437,829	1,233,761
Non-current non-financial assets (Note 15)		166,929	327,152
Total non-current assets		178,114,791	165,503,993
Total Assets (Note 4)		197,597,792	185,249,061
Current liabilities
Trade and other payables, net (Notes 5,22,24,45 and 47)		6,649,402	6,405,395
Current financial liabilities, net (Notes 5,12,23,45 and 47)		8,930,903	7,981,879
Income tax payables (Note 41)		358,277	285,420
Current non-financial liabilities (Notes 20,28 and 29)		5,688,353	5,574,041
Current provisions (Notes 26 and 45)		2,604,721	1,594,798
Total current liabilities		24,231,656	21,841,533
Non-current liabilities
Non-current trade and other payables, net (Notes 5,22,24,45 and 47)		6,965,760	2,941,696
Non-current financial liabilities, net (Notes 5,12,23,45 and 47)		59,115,598	53,364,911
Non-current non-financial liabilities (Notes 28 and 29)		8,834,452	8,160,033
Employee benefits liabilities, net (Notes 25 and 45)		1,929,854	1,645,069
Deferred tax liabilities (Note 41)		8,564,775	9,617,309
Non-current provisions (Notes 26 and 45)		19,066,048	16,585,748
Total non-current liabilities		104,476,487	92,314,766
Total liabilities (Note 4)		128,708,143	114,156,299
Equity
Contributed capital (Notes 1,30 and 45)		4,053,578	4,053,578
Share capital		3,209,820	3,209,820
Share premium		843,758	843,758
Retained earnings (Note 31)		49,202,133	51,519,119
Legal reserves	[1]	1,604,910	1,604,910
Voluntary reserves		34,785,425	35,906,267
Unappropriated retained earnings		12,811,798	14,007,942
Other components of equity (Note 34)		14,240,607	14,171,228
Other capital surplus		1,226,364	1,234,825
Accumulated other comprehensive loss		(280,730)	(358,570)
Other equity		13,294,973	13,294,973
Equity attributable to owners of the controlling company		67,496,318	69,743,925
Non-controlling interests (Notes 16 and 33)		1,393,331	1,348,837
Total equity		68,889,649	71,092,762
Total liabilities and equity		₩ 197,597,792	₩ 185,249,061
[1]	The KEPCO Act requires KEPCO to appropriate a legal reserve equal to at least 20 percent of net income for each accounting period until the reserve equals 50 percent of KEPCO's common stock. The legal reserve is not available for cash dividends; however, this reserve may be credited to paid-in capital or offset against accumulated deficit by the resolution of the shareholders.

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of comprehensive income [Abstract]
Sales (Notes 4,35,45 and 47)	₩ 58,568,082	₩ 60,033,062	₩ 59,335,889
Sales of goods	56,894,876	57,897,804	55,772,548
Sales of construction services (Note 20)	1,264,916	1,742,391	3,212,184
Sales of services	408,290	392,867	351,157
Cost of sales (Notes 14,25,43 and 47)	(57,779,835)	(58,207,721)	(52,098,855)
Cost of sales of goods	(55,750,468)	(55,976,628)	(48,454,036)
Cost of sales of construction services	(998,766)	(1,638,869)	(3,047,396)
Cost of sales of services	(1,030,601)	(592,224)	(597,423)
Gross profit	788,247	1,825,341	7,237,034
Selling and administrative expenses (Notes 25,36,43 and 47)	(2,669,576)	(2,627,890)	(2,762,855)
Other income (Note 37)	997,973	969,894	869,118
Other expenses (Note 37)	(241,913)	(231,330)	(180,055)
Other gains (losses), net (Note 38)	(582,258)	(621,124)	156,627
Operating profit (loss) (Note 4)	(1,707,527)	(685,109)	5,319,869
Finance income (Notes 5,12 and 39)	1,009,706	796,870	1,530,618
Finance expenses (Notes 5,12 and 40)	(2,782,156)	(2,470,743)	(3,127,952)
Profit (loss) related to associates, joint ventures and subsidiaries (Notes 4,16 and 17)	214,139	358,163	(108,317)
Share in profit of associates and joint ventures	257,673	473,269	241,537
Gain on disposal of investments in associates and joint ventures	70,094	5,079	609
Gain on disposal of investments in subsidiaries	0	73	0
Share in loss of associates and joint ventures	(90,853)	(110,168)	(323,225)
Loss on disposal of investments in associates and joint ventures	(2)	(2,183)	0
Impairment loss on investments in associates and joint ventures	(22,517)	(7,907)	(27,238)
Loss on disposal of investments in subsidiaries	(256)	0	0
Profit (loss) before income tax	(3,265,838)	(2,000,819)	3,614,218
Income tax benefit (expense) (Note 41)	1,002,303	826,321	(2,172,824)
Profit (loss) for the period	(2,263,535)	(1,174,498)	1,441,394
Other comprehensive income (loss) (Notes 5,12,25,31 and 34)	135,196	(106,925)	(94,716)
Items that will not be reclassified subsequently to profit or loss:
Remeasurements of defined benefit liability, net of tax (Notes 25 and 31)	42,315	(108,169)	170,337
Share in other comprehensive loss of associates and joint ventures, net of tax (Note 31)	(6,789)	(1,153)	10,067
Net change in fair value of financial assets at fair value through other comprehensive income (Note 34)	(11,732)	(34,185)	0
Items that are or may be reclassified subsequently to profit or loss:
Net change in the unrealized fair value of available-for-sale financial assets, net of tax (Note 34)	0	0	(7,098)
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax (Notes 5, 12 and 34)	19,242	211	20,868
Foreign currency translation of foreign operations, net of tax (Note 34)	72,816	(20,717)	(134,196)
Share in other comprehensive income (loss) of associates and joint ventures, net of tax (Note 34)	19,344	57,088	(154,694)
Total comprehensive income (loss) for the period	(2,128,339)	(1,281,423)	1,346,678
Profit (loss) attributable to:
Owners of the controlling company (Note 44)	(2,345,517)	(1,314,567)	1,298,720
Non-controlling interests	81,982	140,069	142,674
Profit (loss) for the period	(2,263,535)	(1,174,498)	1,441,394
Total comprehensive income (loss) attributable to:
Owners of the controlling company	(2,239,147)	(1,426,477)	1,230,194
Non-controlling interests	110,808	145,054	116,484
Other comprehensive income (loss)	₩ (2,128,339)	₩ (1,281,423)	₩ 1,346,678
Earnings (loss) per share (in won) (Note 44)
Basic and diluted earnings per share	₩ (3,654)	₩ (2,048)	₩ 2,023

Consolidated Statements Of Chan

Consolidated Statements Of Changes In Equity - KRW (₩) ₩ in Millions	Total	Equity attributable to owners of parent	Contributed capital	Retained earnings	Other Components Of Equity	Non-controlling interests
Balance at Dec. 31, 2016	₩ 73,050,545	₩ 71,723,693	₩ 4,053,578	₩ 53,173,871	₩ 14,496,244	₩ 1,326,852
Comprehensive income
Profit (loss) for the period	1,441,394	1,298,720	0	1,298,720	0	142,674
Items that will not be reclassified subsequently to profit or loss:
Remeasurements of defined benefit liability, net of tax	170,337	158,991	0	158,991	0	11,346
Share in other comprehensive income (loss) of associates and joint ventures, net of tax	10,067	10,065	0	10,065	0	2
Net change in fair value of financial assets at fair value through other comprehensive income	0
Items that are or may be reclassified subsequently to profit or loss:
Net change in the unrealized fair value of available-for-sale financial assets, net of tax	(7,098)	(7,102)	0	0	(7,102)	4
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax	20,868	19,614	0	0	19,614	1,254
Foreign currency translation of foreign operations, net of tax	(134,196)	(95,103)	0	0	(95,103)	(39,093)
Share in other comprehensive income (loss) of associates and joint ventures, net of tax	(154,694)	(154,991)	0	0	(154,991)	297
Dividends paid	(1,341,341)	(1,271,089)	0	(1,271,089)	0	(70,252)
Issuance of shares capital by subsidiaries	17,003	(1,378)	0	0	(1,378)	18,381
Changes in consolidation scope	7,337	0	0	0	0	7,337
Dividends paid (hybrid bond)	(15,856)	0	0	0	0	(15,856)
Repayment of hybrid bond	(99,750)	0	0	0	0	(99,750)
Other changes in equity	25	25	0	0	25	0
Balance at Dec. 31, 2017	72,964,641	71,681,445	4,053,578	53,370,558	14,257,309	1,283,196
Effect of change in accounting policy	(4,923)	(4,923)	0	71,928	(76,851)	0
Comprehensive income
Profit (loss) for the period	(1,174,498)	(1,314,567)	0	(1,314,567)	0	140,069
Items that will not be reclassified subsequently to profit or loss:
Remeasurements of defined benefit liability, net of tax	(108,169)	(100,495)	0	(100,495)	0	(7,674)
Share in other comprehensive income (loss) of associates and joint ventures, net of tax	(1,153)	(1,153)	0	(1,153)	0	0
Net change in fair value of financial assets at fair value through other comprehensive income	(34,185)	(34,125)	0	0	(34,125)	(60)
Items that are or may be reclassified subsequently to profit or loss:
Net change in the unrealized fair value of available-for-sale financial assets, net of tax	0
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax	211	(1,140)	0	0	(1,140)	1,351
Foreign currency translation of foreign operations, net of tax	(20,717)	(32,086)	0	0	(32,086)	11,369
Share in other comprehensive income (loss) of associates and joint ventures, net of tax	57,088	57,089	0	0	57,089	(1)
Dividends paid	(599,893)	(507,152)	0	(507,152)	0	(92,741)
Issuance of shares capital by subsidiaries	18,215	1,032	0	0	1,032	17,183
Changes in consolidation scope	9,530	0	0	0	0	9,530
Dividends paid (hybrid bond)	(13,385)	0	0	0	0	(13,385)
Balance at Dec. 31, 2018	71,092,762	69,743,925	4,053,578	51,519,119	14,171,228	1,348,837
Comprehensive income
Profit (loss) for the period	(2,263,535)	(2,345,517)	0	(2,345,517)	0	81,982
Items that will not be reclassified subsequently to profit or loss:
Remeasurements of defined benefit liability, net of tax	42,315	36,160	0	36,160	0	6,155
Share in other comprehensive income (loss) of associates and joint ventures, net of tax	(6,789)	(6,789)	0	(6,789)	0	0
Net change in fair value of financial assets at fair value through other comprehensive income	(11,732)	(11,732)	0	0	(11,732)	0
Items that are or may be reclassified subsequently to profit or loss:
Net change in the unrealized fair value of available-for-sale financial assets, net of tax	0
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax	19,242	14,041	0	0	14,041	5,201
Foreign currency translation of foreign operations, net of tax	72,816	55,347	0	0	55,347	17,469
Share in other comprehensive income (loss) of associates and joint ventures, net of tax	19,344	19,343	0	0	19,343	1
Dividends paid	(99,255)	0	0	0	0	(99,255)
Issuance of shares capital by subsidiaries	21,071	0	0	0	0	21,071
Equity transactions between consolidated entities	(8,137)	(8,460)			(8,460)	323
Changes in consolidation scope	24,932	0	0	0	0	24,932
Dividends paid (hybrid bond)	(13,385)	0	0	0	0	(13,385)
Other changes in equity	0	0	0	(840)	840	0
Balance at Dec. 31, 2019	₩ 68,889,649	₩ 67,496,318	₩ 4,053,578	₩ 49,202,133	₩ 14,240,607	₩ 1,393,331

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows provided by operating activities
Profit (loss) for the period	₩ (2,263,535)	₩ (1,174,498)	₩ 1,441,394
Adjustments for:
Income Tax expense (benefit)	(1,002,303)	(826,321)	2,172,824
Depreciation	10,971,825	9,905,856	9,660,039
Amortization	156,915	118,938	113,672
Employee benefit expense	725,120	360,575	391,360
Bad debt expense	16,629	57,468	126,326
Interest expense	2,046,811	1,868,458	1,789,552
Loss on sale of financial assets	2,106	1	2,343
Loss on disposals of property, plant and equipment	72,508	60,704	70,514
Loss on abandonment of property, plant, and equipment	364,233	481,176	424,091
Impairment loss on property, plant and equipment	50,034	710,162	51,067
Impairment loss on intangible assets	513,609	8,112	20
Loss on disposal of intangible assets	827	43	183
Increase to provisions	2,301,215	1,056,994	1,690,120
Loss (gain) on foreign currency translation, net	370,309	243,378	(902,878)
Gain on valuation of financial assets at fair value through profit or loss	(5,575)	(8,495)	0
Loss on valuation of financial assets at fair value through profit or loss	4,513	6,616	0
Valuation and transaction loss (gain) on derivative instruments, net	(403,765)	(300,500)	1,043,628
Share in loss (profit) of associates and joint ventures, net	(166,820)	(363,101)	81,688
Gain on disposal of financial assets	(3,866)	(1,838)	(1,130)
Gain on disposal of property plant, and equipment	(43,784)	(98,077)	(48,316)
Gain on disposal of intangible assets	(206)	(12)	(564)
Gain on disposal of investments in associates and joint ventures	(70,094)	(5,079)	(609)
Loss on disposal of investments in associates and joint ventures	2	2,183	0
Impairment loss on investments in associates and joint ventures	22,517	7,907	27,238
Gain on disposal of investments in subsidiaries	0	(72)	0
Loss on disposal of investments in subsidiaries	256	0	0
Interest income	(268,118)	(223,767)	(206,143)
Dividend income	(13,838)	(12,777)	(11,477)
Impairment loss on available-for-sale financial assets	0	0	2,713
Other inflows (outflows) of cash	128,237	81,317	16,679
Adjustments for Cash flows from operating activities	15,769,297	13,129,849	16,492,940
Changes in:
Trade receivables	95,345	246,755	(218,328)
Non-trade receivables	64,027	154,580	(31,807)
Accrued income	83,589	(484,718)	577,838
Other receivables	(116,583)	(61,961)	(1,271)
Other current assets	(271,986)	(148,509)	37,576
Inventories	(980,216)	(1,771,550)	(1,373,438)
Other non-current assets	(611,066)	(54,148)	(46,079)
Trade payables	(546,159)	478,744	342,126
Non-trade payables	192,506	(292,912)	(214,704)
Accrued expenses	(454,501)	(361,204)	(715,305)
Other payables	0	0	292
Other current liabilities	373,403	250,112	(126,323)
Other non-current liabilities	650,468	287,488	763,958
Investments in associates and joint ventures (dividends received)	215,612	175,175	106,983
Provisions	(1,473,461)	(1,132,969)	(1,390,606)
Payments of employee benefit obligations	(65,242)	(89,253)	(69,489)
Plan assets	(348,386)	(330,064)	(325,080)
Changes in assets and liabilities Cash flows from operating activities	(3,192,650)	(3,134,434)	(2,683,657)
Cash generated from operating activities	10,313,112	8,820,917	15,250,677
Dividends received (available-for-sale financial assets)	24,255	11,182	10,590
Interest paid	(2,027,850)	(1,895,898)	(1,886,303)
Interest received	186,122	194,221	173,226
Income taxes paid	(282,211)	(450,290)	(2,298,296)
Net cash flows from operating activities	8,213,428	6,680,132	11,249,894
Cash flows provided by investing activities
Proceeds from disposals of investments in associates and joint ventures	0	1,617	10,542
Acquisition of investments in associates and joint ventures	(107,821)	(319,425)	(206,753)
Proceeds from sales of property, plant and equipment	522,742	234,138	85,801
Acquisition of property, plant and equipment	(14,000,359)	(12,266,870)	(12,535,958)
Proceeds from sales of intangible assets	7,702	13	1,072
Acquisition of intangible assets	(229,426)	(110,587)	(143,887)
Proceeds from disposals of financial assets	2,783,474	2,419,259	5,296,680
Acquisition of financial assets	(2,165,342)	(2,841,651)	(4,786,717)
Increase in loans	(335,773)	(188,675)	(218,698)
Collection of loans	292,745	100,010	120,967
Increase in deposits	(280,637)	(299,564)	(397,078)
Decrease in deposits	275,314	259,930	110,383
Proceeds from disposals of assets held-for-sale	30,662	18,716	0
Receipt of government grants	21,705	30,416	55,533
Cash outflow from merger	(154,311)	0	0
Net cash inflow (outflow) from changes in consolidation scope	(2,917)	2,141	0
Other cash inflow (outflow) from investing activities, net	(157,116)	(53,769)	1,414
Net cash flows used in investing activities	(13,499,358)	(13,014,301)	(12,606,699)
Cash flows provided by financing activities
Proceeds from (Repayment of) short-term borrowings, Net	188,957	(183,660)	370,328
Proceeds from long-term borrowings and debt securities	13,221,407	14,251,586	10,098,067
Repayment of long-term borrowings and debt securities	(7,068,290)	(8,095,590)	(8,198,882)
Payment of lease liabilities	(573,437)	(134,454)	(122,919)
Settlement of derivative instruments, net	102,146	60,907	33,434
Change in non-controlling interests	17,365	20,113	23,582
Repayment of hybrid bond	0	0	(99,750)
Dividends paid (hybrid bond)	(13,385)	(17,658)	(15,856)
Dividends paid	(99,356)	(599,391)	(1,340,387)
Other cash outflow from financing activities, net	0	(175)	(2,023)
Net cash from financing activities	5,775,407	5,301,678	745,594
Net increase (decrease) in cash and cash equivalents before effect of exchange rate fluctuations	489,477	(1,032,491)	(611,211)
Effect of exchange rate fluctuations on cash held	(37,693)	21,097	(70,403)
Net increase (decrease) in cash and cash equivalents	451,784	(1,011,394)	(681,614)
Cash and cash equivalents at January 1	1,358,345	2,369,739	3,051,353
Cash and cash equivalents at December 31	₩ 1,810,129	₩ 1,358,345	₩ 2,369,739

Reporting Entity (Description o

Reporting Entity (Description of the controlling company)	12 Months Ended
	Dec. 31, 2019
Reporting Entity (Description of the controlling company) [Abstract]
Reporting Entity (Description of the controlling company)	1. Reporting Entity (Description of the controlling company) Korea Electric Power Corporation (“KEPCO”) was incorporated on January 1, 1982 in accordance with the Korea Electric Power Corporation Act (the “KEPCO Act”) to engage in the generation, transmission and distribution of electricity and development of electric power resources in the Republic of Korea. KEPCO also provides power plant construction services. KEPCO’s stock was first listed on the Korea Stock Exchange on August 10, 1989 and subsequently on the New York Stock Exchange on October 27, 1994 through its depository receipts. KEPCO’s headquarters is located in Naju, Jeollanam-do. As of December 31, 2019, KEPCO’s share capital amounts to ￦3,209,820 million and KEPCO’s shareholders are as follows: Number of Percentage of ownership The Government of the Republic of Korea 116,841,794 18.20 % Korea Development Bank 211,235,264 32.90 % Foreign investors 154,843,683 24.12 % Other 159,043,336 24.77 % 641,964,077 100.00 % In accordance with the Restructuring Plan enacted on January 21, 1999 by the Ministry of Trade, Industry and Energy, KEPCO spun off its power generation divisions on April 2, 2001, resulting in the establishment of six power generation subsidiaries.

Basis of Preparation

Basis of Preparation	12 Months Ended
	Dec. 31, 2019
Basis of Preparation [Abstract]
Basis of Preparation	2. Basis of Preparation The consolidated financial statements of KEPCO and its subsidiaries (the “Company”) were approved by the Board of Directors on February 28, 2020 and authorized on April 10, 2020 for the purpose of Form 20-F filing with the Securities and Exchange Commission. (1) Statement of compliance These consolidated financial statements have been prepared in accordance with International Financial Reporting Standards (“IFRS”) as issued by the International Accounting Standards Board (“IASB”). (2) Basis of measurement These consolidated financial statements have been prepared on the historical cost basis, except for the following material items in the consolidated statements of financial position: • financial assets at fair value through profit or loss • financial assets at fair value through other comprehensive income • derivative financial instruments are measured at fair value • liabilities for defined benefit plans are recognized at the net of the total present value of defined benefit obligations less the fair value of plan assets (3) Functional and presentation currency These consolidated financial statements are presented in Korean won (“won”), as won is the main currency used in KEPCO and most of the significant operating subsidiaries. (4) Use of estimates and judgments The preparation of the consolidated financial statements in conformity with IFRS requires management to make judgments, estimates and assumptions that affect the application of accounting policies and the reported amounts of assets, liabilities, income and expenses. Actual results may differ from these estimates. Estimates and underlying assumptions are reviewed on an ongoing basis. Revisions to accounting estimates are recognized in the period in which the estimates are revised and in any future periods affected. The followings are the key assumptions and other key sources of estimation uncertainty at the end of the reporting period, that have a significant risk of causing a material adjustment to the carrying amounts of assets and liabilities within the next financial year. (i) Useful lives of property, plant and equipment, and estimations on provision for decommissioning costs The Company reviews the estimated useful lives of property, plant and equipment at the end of each annual reporting period. Management’s assumptions could affect the determination of estimated economic useful lives. The Company records the fair value of estimated decommissioning costs as a liability in the period in which the Company incurs a legal obligation associated with the retirement of long-lived assets that result from acquisition, construction, development and/or normal use of the assets. The Company is required to record a liability for the dismantling (demolition) of nuclear power plants and disposal of spent fuel and low and intermediate radioactive wastes. The measurement of such liability is subject to change based on change in estimated cash flow, inflation rate, discount rate, and expected timing of decommissioning. (ii) Deferred tax The Company recognizes deferred tax assets and liabilities based on the differences between the financial statement carrying amounts and the tax bases of assets and liabilities of each consolidated taxpaying entity. However, the amount of deferred tax assets may be impaired if the Company determines the estimated future taxable income is not sufficient to realize the deferred tax assets recognized. (iii) Valuations of financial instruments at fair values The Company’s accounting policies and disclosures require the measurement of fair values, for both financial and non-financial assets and liabilities. The Company has established control framework with respect to the measurement of fair values. The valuation team regularly reviews significant unobservable inputs and valuation adjustments. If third party information, such as broker quotes or pricing services, is used to measure fair values, then the valuation team assesses the evidence obtained from the third parties to support the conclusion that such valuations meet the requirements of IFRS including the level in the fair value hierarchy in which such valuation techniques should be classified. When measuring the fair value of an asset or a liability, the Company uses market observable data as far as possible. Fair values are categorized into different levels in a fair value hierarchy based on the inputs used in the valuation techniques as follows. If the inputs used to measure the fair value of an asset or a liability might be categorized in different levels of the fair value hierarchy, then the fair value measurement is categorized in its entirety in the same level of the fair value hierarchy as the lowest level input that is significant to the entire measurement. The Company recognizes transfers between levels of the fair value hierarchy at the end of the reporting period during which the change has occurred. (iv) Defined employee benefit liabilities The Company offers its employees defined benefit plans. The cost of providing benefits is determined using the Projected Unit Credit Method, with actuarial valuations being carried out at the end of each reporting period. For actuarial valuations, certain inputs such as discount rates and future salary increases are estimated. Defined benefit plans contain significant uncertainties in estimations due to its long-term nature (refer to Note 25). (v) Unbilled revenue Electricity delivered but neither metered nor billed is estimated at the reporting date based on the progressive electricity billing system, discounts on electricity bills for government policy purposes and penalties as well as a result of customer usage patterns, customer mix, meter reading schedules, weather, and etc. Unbilled revenue recognized as of December 31, 2018 and 2019 are ￦1,671,117 million and ￦1,580,804 million, respectively. (vi) Construction contracts The Company recognizes revenue over time using the cost-based input method which represents a faithful depiction of the Company’s progress towards complete satisfaction of providing the power plant construction, which has been identified as a single performance obligation. In applying the cost-based input method, it is necessary to use estimates and assumptions related to the Company’s efforts or inputs expected to be incurred. Cost incurred towards contract completion include costs associated with direct materials, labor, and other indirect costs related to contract performance. Judgment is required in estimating the costs expected to incur in completing the construction projects which involves estimating future materials, labor, contingencies and other related costs. Revenue is estimated based on the contractual amount however, it can also be affected by uncertainties resulting from unexpected future events. (vii) Early shutdown of Wolsong unit 1 nuclear power plant and changes in new nuclear power plants construction The 30-year According to the Eighth Basic Plan for Electricity Supply and Demand announced by the Ministry of Trade, Industry and Energy in 2017, Wolsong unit 1 nuclear power plant was expected to go through a comprehensive evaluation for the feasibility of continuous operation including economic efficiency and acceptability of household and community in 2018 in order to decide whether to shut down early. On June 15, 2018, the board of directors of Korea Hydro & Nuclear Power Co., Ltd. (“KHNP”), a subsidiary of KEPCO, has decided to shut down the Wolsong unit 1 on the grounds that its deficit was increasing, and its economic efficiency was low due to the unoptimistic utilization rate. On December 24, 2019, NSSC approved the permanent shutdown of unit 1. In addition, KHNP has also decided to discontinue the construction of Cheonji unit 1 and 2 and Daejin unit 1 and 2 pursuant to the government policy. For this reason, the Company recognized impairment loss, reversal of impairment loss and other expenses during the year 2018 and 2019, as described in Note 18 and Note 50. Among the new nuclear power plants under construction, Shin-Hanul unit 3 and 4, for which approval for power generation business was previously obtained, are not included in the decision to suspend construction of the board of directors of KHNP. However, considering the decision to shut down Wolsong unit 1 and suspended construction of Cheonji unit 1 and 2 and Daejin unit 1 and 2, it is highly likely that the construction of Shin-Hanul unit 3 and 4 will be suspended according to the government’s policy. For this reason, the Company recognized impairment loss as described in Note 18 and Note 50, as the Company believes that there was a significant change in its operating environment during the year ended December 31, 2018. The Korean government plans to refund to the Company for reasonable expenditures incurred in relation to the phase-out Information about critical judgments in applying accounting policies that have the most significant effect on the amounts recognized in the consolidated financial statements is included in the following notes: • Note 17 – Investments in Associates and Joint Ventures • Note 18 – Property, Plant and Equipment • Note 20 – Construction Contracts • Note 45 – Risk Management Information about assumptions and estimation uncertainties that have a significant risk of resulting in a material adjustment within the next financial year is included in the following notes: • Note 25 – Employment Benefits • Note 41 – Income Taxes (5) Changes in accounting policies (i) IFRS 16 ‘Leases’ IFRS 16 replaces existing leases guidance, including IAS 17 ‘Lease’, IFRIC 4 ‘Determining whether an Arrangement contains a Lease’, SIC-15 SIC-27 on-balance Lessor accounting under IFRS 16 is substantially unchanged from IAS 17. Lessors will continue to classify leases as either operating or finance leases using similar principles as in IAS 17. The Company adopted IFRS 16 using the modified retrospective method of adoption with the date of initial application of January 1, 2019. Under this method, the standard is applied retrospectively with the cumulative effect of initially applying the standard recognized at the date of initial application. The Company elected to use the recognition exemptions for lease contracts that, at the commencement date, have a lease term of 12 months or less and do not contain a purchase option (‘short-term leases’), and lease contracts for which the underlying asset is of low value (‘leases of low-value The impacts on the Company’s consolidated statements of financial position on the date of initial application (January 1, 2019) of IFRS 16 are as follows: Carrying amount Adjustment Carrying amount In millions of won Assets Current assets Cash and cash equivalents ￦ 1,358,345 — 1,358,345 Current financial assets, net 2,359,895 — 2,359,895 Trade and other receivables, net 7,793,592 — 7,793,592 Inventories, net 7,188,253 — 7,188,253 Income tax refund receivables 143,214 — 143,214 Current non-financial 878,888 (3,021 ) 875,867 Assets held-for-sale 22,881 — 22,881 Total current assets 19,745,068 (3,021 ) 19,742,047 Non-current Non-current 2,113,613 — 2,113,613 Non-current 1,819,845 (10 ) 1,819,835 Property, plant and equipment, net 152,743,194 4,947,947 157,691,141 Investment properties, net 159,559 — 159,559 Goodwill 2,582 — 2,582 Intangible assets other than goodwill, net 1,225,942 — 1,225,942 Investments in associates 4,064,820 — 4,064,820 Investments in joint ventures 1,813,525 — 1,813,525 Deferred tax assets 1,233,761 — 1,233,761 Non-current non-financial 327,152 (1,332 ) 325,820 Total non-current 165,503,993 4,946,605 170,450,598 Total Assets ￦ 185,249,061 4,943,584 190,192,645 Carrying amount Adjustment Carrying amount In millions of won Liabilities Current liabilities Trade and other payables, net ￦ 6,405,395 510,304 6,915,699 Current financial liabilities, net 7,981,879 — 7,981,879 Income tax payables 285,420 — 285,420 Current non-financial 5,574,041 — 5,574,041 Current provisions 1,594,798 — 1,594,798 Total current liabilities 21,841,533 510,304 22,351,837 Non-current Non-current 2,941,696 4,433,280 7,374,976 Non-current 53,364,911 — 53,364,911 Non-current non-financial 8,160,033 — 8,160,033 Employee benefits liabilities, net 1,645,069 — 1,645,069 Deferred tax liabilities 9,617,309 — 9,617,309 Non-current 16,585,748 — 16,585,748 Total non-current 92,314,766 4,433,280 96,748,046 Total Liabilities(*) ￦ 114,156,299 4,943,584 119,099,883 Equity Contributed capital ￦ 4,053,578 — 4,053,578 Retained earnings 51,519,119 — 51,519,119 Other components of equity 14,171,228 — 14,171,228 Equity attributable to owners of the controlling company 69,743,925 — 69,743,925 Non-controlling 1,348,837 — 1,348,837 Total Equity ￦ 71,092,762 — 71,092,762 Total Liabilities and Equity ￦ 185,249,061 4,943,584 190,192,645 (*) The adjustment from the total liabilities amounting to ￦4,943,584 is a present value of operating lease payment as of December 31, 2018, discounted by the weighted average interest rate of the lessee’s incremental borrowing rates as of January 1, 2019, and deducted by the present value of short-term leases and low-value The Company has lease contracts for various items such as consecutive voyage charter contracts, power purchase agreements (PPA), real estate lease contracts including buildings, switchyard, and land for electric substations, vehicles, and other equipment. Before adoption of IFRS 16, the Company, as a lessee, classified a lease contract as a finance lease if it transferred substantially all of the risks and rewards incidental to ownership of the leased asset to the Company; otherwise as an operating lease. Upon adoption of IFRS 16, the Company applied a single recognition and measurement approach for all leases, except for short-term leases and leases of low-value The significant accounting policies applied by the Company in preparation of its consolidated financial statements are described in Note 3.(9).

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2019
Significant Accounting Policies [Abstract]
Significant Accounting Policies	3. Significant Accounting Policies The significant accounting policies applied by the Company in preparation of its consolidated financial statements are included below. Except as described in Note 2.(5), the Company applied the following significant accounting policies consistently throughout the all periods presented. (1) Basis of consolidation The consolidated financial statements are the financial statements of the Company in which the assets, liabilities, equity, income, expenses and cash flows of KEPCO and its subsidiaries are presented as those of a single economic entity. Subsidiaries are those entities controlled by the Company. The Company controls an entity when it is exposed to, or has rights to, variable returns from its involvement with the entity and has the ability to affect those returns through its power over the entity. Income and expense of a subsidiary acquired or disposed of during the year are included in the consolidated statement of comprehensive income from the effective date of acquisition and up to the effective date of disposal, as appropriate. Total comprehensive income of subsidiaries is attributed to the owners of the Company and to the non-controlling non-controlling When necessary, adjustments are made to the financial statements of subsidiaries to bring their accounting policies into line with those of the Company. Transactions within the Company are eliminated during the consolidation. Changes in the Company’s ownership interests in a subsidiary that do not result in the Company losing control over the subsidiary are accounted for as equity transactions. The carrying amounts of the Company’s interests and the non-controlling non-controlling When the Company loses control of a subsidiary, any gain or loss on disposal is calculated as the difference between (i) the aggregate of the fair value of the consideration received and the fair value of any retained interest and (ii) the previous carrying amount of the assets (including goodwill), and liabilities of the subsidiary and any non-controlling (2) Business combinations A business combination is accounted for by applying the acquisition method, unless it is a combination involving entities or businesses under common control. The consideration transferred in a business combination is measured at fair value, which is calculated as the sum of the acquisition-date fair values of the assets transferred by the Company, liabilities incurred by the Company to the former owners of the acquiree and the equity interests issued by the Company in exchange for control of the acquiree. Acquisition-related costs are generally recognized in profit or loss as incurred. At the acquisition date, the identifiable assets acquired, and the liabilities assumed are recognized at their fair value at the acquisition date, except that: • deferred tax assets or liabilities and liabilities or assets related to employee benefit arrangements are recognized and measured in accordance with IAS 12 ‘Income Taxes’ and IAS 19 ‘Employee Benefits’ respectively; • assets (or disposal groups) that are classified as held for sale in accordance with IFRS 5 ‘Non-current Goodwill is measured as the excess of the sum of the consideration transferred, the amount of any non-controlling non-controlling Non-controlling non-controlling transaction-by-transaction non-controlling The subsequent accounting for changes in the fair value of the contingent consideration that do not qualify as measurement period adjustments depends on how the contingent consideration is classified. Contingent consideration that is classified as equity is not re-measured re-measured When a business combination is achieved in stages, the Company’s previously held equity interest in the acquiree is re-measured If the initial accounting for a business combination is incomplete by the end of the reporting period in which the combination occurs, the Company reports provisional amounts for the items for which the accounting is incomplete. Those provisional amounts are adjusted during the measurement period (see above), or additional assets or liabilities are recognized, to reflect new information obtained about facts and circumstances that existed at the acquisition date that, if known, would have affected the amounts recognized at that date. The assets and liabilities acquired under business combinations under common control are recognized at the carrying amounts recognized previously in the consolidated financial statements of the ultimate parent. The difference between consideration transferred and carrying amounts of net assets acquired is recognized as part of share premium. (3) Investments in associates An associate is an entity over which the Company has significant influence and that is neither a subsidiary nor an interest in a joint venture. Significant influence is the power to participate in the financial and operating policy decisions of the investee but does not control or joint control over those policies. If the Company holds 20% ~ 50% of the voting power of the investee, it is presumed that the Company has significant influence. The results and assets and liabilities of associates are incorporated in these consolidated financial statements using the equity method of accounting. If the investment is classified as held for sale, in which case it is accounted for in accordance with IFRS 5 ‘Non-current Under the equity method, an investment in an associate is initially recognized in the consolidated statement of financial position at cost and adjusted thereafter to recognize the Company’s share of the profit or loss and other comprehensive income of the associate. When the Company’s share of losses of an associate exceeds the Company’s interest in that associate (which includes any long-term interests that, in substance, form part of the Company’s net investment in the associate), the Company discontinues recognizing its share of further losses. Additional losses are recognized only to the extent that the Company has incurred legal or constructive obligations or made payments on behalf of the associate. Any excess of the cost of acquisition over the Company’s share of the net fair value of the identifiable assets, liabilities and contingent liabilities of an associate recognized at the date of acquisition is recognized as goodwill, which is included within the carrying amount of the investment. Any excess of the Company’s share of the net fair value of the identifiable assets, liabilities and contingent liabilities over the cost of acquisition, after reassessment, is recognized immediately in profit or loss. Upon disposal of an associate that results in the Company losing significant influence over that associate, any retained investment is measured at fair value at that date and the fair value is regarded as its fair value on initial recognition as a financial asset in accordance with IFRS 9. The difference between the previous carrying amount of the associate attributable to the retained interest and its fair value is included in the determination of the gain or loss on disposal of the associate. In addition, the Company accounts for all amounts previously recognized in other comprehensive income in relation to that associate on the same basis as would be required if that associate had directly disposed of the related assets or liabilities. Therefore, if a gain or loss previously recognized in other comprehensive income by that associate would be reclassified to profit or loss on the disposal of the related assets or liabilities, the Company reclassifies the gain or loss from equity to profit or loss (as a reclassification adjustment) when it loses significant influence over that associate. The requirements of IAS 28 ‘Investments in Associates and Joint Ventures’ are applied to determine whether it is necessary to recognize any impairment loss with respect to the Company’s investment in an associate. When necessary, the entire carrying amount of the investment (including goodwill) is tested for impairment in accordance with IAS 36 ‘Impairment of Assets’ as a single asset by comparing its recoverable amount (higher of value in use and fair value less costs to sell) with its carrying amount, any impairment loss recognized forms part of the carrying amount of the investment. Any reversal of that impairment loss is recognized in accordance with IAS 36 to the extent that the recoverable amount of the investment subsequently increases. When the Company transacts with its associate, incomes and losses resulting from the transactions with the associate are recognized in the Company’s consolidated financial statements only to the extent of interests in the associate that are not related to the Company. (4) Joint arrangements A joint arrangement is an arrangement of which two or more parties have joint control. Joint control is the contractually agreed sharing of control of an arrangement, which exists only when decisions about the relevant activities require the unanimous consent of the parties sharing control. Joint arrangements are classified into two types—joint operations and joint ventures. A joint operation is a joint arrangement whereby the parties that have joint control of the arrangement (i.e., joint operators) have rights to the assets, and obligations for the liabilities, relating to the arrangement. A joint venture is a joint arrangement whereby the parties that have joint control of the arrangement (i.e., joint ventures) have rights to the net assets of the arrangement. If the Company is a joint operator, the Company is to recognize and measure the assets and liabilities (and recognize the related revenues and expenses) in relation to its interest in the arrangement in accordance with relevant IFRSs applicable to the particular assets, liabilities, revenues and expenses. If the joint arrangement is a joint venture, the Company is to account for that investment using the equity method accounting in accordance with IAS 28 ‘Investment in Associates and Joint Ventures’ (refer to Note 3.(3), except when the Company is applicable to the IFRS 5 ‘Non-current (5) Non-current Non-current non-current When the Company is committed to a sale plan involving loss of control of a subsidiary, all of the assets and liabilities of that subsidiary are classified as held for sale when the criteria described above are met, regardless of whether the Company will retain a non-controlling Non-current (6) Goodwill The Company measures goodwill which acquired in a business combination at the amount recognized at the date on which it obtains control of the acquiree (acquisition date) less any accumulated impairment losses. Goodwill acquired in a business combination is allocated to each cash-generating unit (CGU) that is expected to benefit from the synergies arising from the business acquired. The Company assesses at the end of each reporting period and whenever there is an indication that the asset may be impaired. An impairment loss is recognized if the carrying amount of an asset or a CGU exceeds its recoverable amount. Impairment losses are recognized in profit or loss. Any impairment identified at the CGU level will first reduce the carrying value of goodwill and then be used to reduce the carrying amount of the other assets in the CGU on a pro rata basis. Except for impairment losses in respect of goodwill which are never reversed, an impairment loss is reversed if there has been a change in the estimates used to determine the recoverable amount. An impairment loss is reversed only to the extent that the asset’s carrying amount does not exceed the carrying amount that would have been determined, net of depreciation or amortization, if no impairment loss had been recognized. On disposal of the relevant CGU, the amount of goodwill is included in the determination of the gain or loss on disposal. (7) Revenue from Contracts with Customers The Company recognizes revenue by applying the five-step approach (Step 1: Identify the contract(s) with a customer, Step 2: Identify the performance obligations in the contract, Step 3: Determine the transaction price, Step 4: Allocate the transaction price to the performance obligations in the contract, Step 5: Recognize revenue when the entity satisfied a performance obligation). The Company recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services, excluding amounts collected on behalf of third parties. Also, the Company recognizes revenue when the Company satisfies a performance obligation by transferring a promised good or service to a customer. (i) Sale of goods The Company sells electricity to customers and accounts for the transmission and distribution of electricity as a single performance obligation. The sale of electricity is recognized at a point in time when electricity has been distributed to the customer. The transaction price includes variable consideration due to the progressive electricity billing system, discounts on electricity bills for government policy purposes and penalties as well as a result of customer usage patterns, customer mix, meter reading schedules, weather, etc. Variable consideration is estimated by using the expected value method which predicts the amount of consideration to which the Company will be entitled and is only recognized only to the extent that it is highly probable that a significant reversal in the amount of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is subsequently resolved which is when the customer is billed. (ii) Sale of construction services The Company also provides services for power plant construction and engineering, procurement and construction (“EPC”) where each contract has a single performance obligation and is recognized over time on the estimated progress to completion of the construction using the cost-based input method. The Company believes using the cost-based input method represents a faithful depiction of the transfer of services to the customer. Cost incurred towards contract completion include costs associated with direct materials, labor, and other indirect costs related to contract performance. Judgment is required in estimating the costs expected to incur in completing the construction projects which involves estimating future materials, labor, contingencies and other related costs. Revenue is estimated based on the contractual amount. However, it may be affected by uncertainties resulting from unexpected future events. Revenue may be recognized in advance of billing the customer which results in the recording of a contract asset. Once the Company meets the billing criteria and its rights to consideration become unconditional, the contract asset is then transferred to trade receivable. Billing requirements are generally structured around the completion of certain construction milestones. On some instances, contract liability is recognized when the Company receives consideration before being able to recognize revenue. Once revenue recognition conditions are met, the contract liability is subsequently released to revenue. (iii) Sale of services The Company develops electric power resources including the provision of power generation byproducts and O&M services which are accounted for as a separate performance obligation under each contract. The Company recognizes revenue over time when customers consume the benefits provided by the Company under the terms of the service agreement. (8) Deferred Revenue The Company receives consideration in the form of an item of property, equipment or cash for constructing or acquiring an item of property or equipment in exchange for supplying electricity to its customers. The transaction price is based on the fair value of the consideration received and is initially recorded in deferred revenue included in current and non-current non-financial liabilities of the Company’s consolidated financial position. The Company determines the supply of electricity to be a single performance obligation. Deferred revenue is released to other income over time on a straight-line basis throughout the estimated service period which does not exceed the transferred asset’s useful life. (9) Leases The lessee and the lessor account for each lease component separately from non-lease non-lease non-lease (i) The Company as a lessor In the case of finance leases, the Company recognizes the same amount of the net investment in the lease as finance lease receivables and recognizes interest income using the effective interest method. Income from operating leases is recognized using the straight-line basis over the lease term, and lease opening direct costs incurred during the negotiation and contract phase of the operating lease contract are added to the carrying amount of the lease asset and recognized as expenses over the lease term on a straight-line basis. (ii) The Company as a lessee (a) Leases previously classified as finance leases The Company did not change the initial carrying amounts of recognized assets and liabilities at the date of initial application for leases previously classified as finance leases (i.e., the right-of-use (b) Leases previously accounted for as operating leases The Company recognized right-of-use low-value right-of-use • Lease liabilities At the commencement date of the lease, the Company recognized lease liabilities measured at the present value of lease payments to be made over the lease term. The incremental borrowing rate as a lessee at the date of initial application is 1.81% ~ 4.79%, and the effect of initial adoption are described in Note 2.(5). The Company applied the practical expedient to post-judgment of the possibility of exercising the option of extension or termination when estimating the remaining lease duration. The Company also applied a single discount rate to a portfolio of leases with similar characteristics. • Right-of-use The Company recognized a right-of-use right-of-use Contracts recognized as leases before the date of initial application are accounted for leases regardless of whether they meet the new lease definition or not. After the date of initial application, the Company evaluates whether new lease contracts meet definition of the lease under IFRS 16. The Company also applied the available practical expedients wherein it: • Applied the short-term leases exemptions to leases with lease term that ends within 12 months at the date of initial application • Excluded the initial direct costs from the measurement of the right-of-use • Used hindsight in determining the lease term where the contract contains options to extend or terminate the lease • Applied the low-value (iii) Summary of new accounting policies Set out below are the new accounting policies of the Company upon adoption of IFRS 16, which have been applied from the date of initial application: • Right-of-use The Company recognizes right-of-use Right-of-use re-measurement right-of-use right-of-use Right-of-use • Lease liabilities At the commencement date of the lease, the Company recognizes lease liabilities measured at the present value of lease payments to be made over the lease term. The lease payments include fixed payments (including in-substance In calculating the present value of lease payments, the Company uses its incremental borrowing rate at the lease commencement date if the interest rate implicit in the lease is not readily determinable. After the commencement date, the amount of lease liabilities is increased to reflect the accretion of interest and reduced for the lease payments made. In addition, the carrying amount of lease liabilities is remeasured if there is a modification, a change in the lease term, a change in the in-substance • Short-term leases and leases of low-value The Company applies the short-term leases recognition exemption to its short-term leases of machinery and equipment (i.e., those leases that have a lease term of 12 months or less from the commencement date and do not contain a purchase option). It also applies the leases of low-value low-value Book value and changes in book value of right-of-use (10) Foreign currencies Transactions in foreign currencies are translated to the respective functional currencies of the Company entities at exchange rates at the dates of the transactions. Monetary assets and liabilities denominated in foreign currencies are retranslated to the functional currency using the reporting date’s exchange rate. Non-monetary Exchange differences are recognized in profit or loss in the period in which they arise except for: • Exchange differences on foreign currency borrowings relating to assets under construction for future productive use, which are included in the cost of those assets when they are regarded as an adjustment to interest costs on those foreign currency borrowings; • Exchange differences on transactions entered into in order to hedge certain foreign currency risks (refer to note 3.(24) Derivative financial instruments, including hedge accounting); and • Exchange differences on monetary items receivable from or payable to a foreign operation for which settlement is neither planned nor likely to occur (therefore forming part of the net investment in the foreign operation), which are recognized initially in other comprehensive income and reclassified from equity to profit or loss on disposal or partial disposal of the net investment. For the purpose of presenting financial statements, the assets and liabilities of the Company’s foreign operations are expressed in Korean won using exchange rates prevailing at the end of the reporting period. Income and expense items are translated at the average exchange rates for the period, unless exchange rates fluctuated significantly during that period, in which case the exchange rates at the dates of the transactions are used. Exchange differences arising, if any, are recognized in other comprehensive income and accumulated in equity. When a foreign operation is disposed of, the relevant amount in the translation is transferred to profit or loss as part of the gain or loss on disposal. (11) Borrowing costs The Company capitalizes borrowing costs directly attributable to the acquisition, construction or production of a qualifying asset as part of the cost of that asset. Other borrowing costs are recognized in expense as incurred. A qualifying asset is an asset that requires a substantial period of time to get ready for its intended use or sale. Investment income earned on the temporary investment of specific borrowings pending their expenditure on qualifying assets is deducted from the borrowing costs eligible for capitalization. All other borrowing costs are recognized in profit or loss in the period in which they are incurred. (12) Government grants Government grants are not recognized unless there is reasonable assurance that the Company will comply with the grant’s conditions and that the grant will be received. Benefit from a government loan at a below-market interest rate is treated as a government grant, measured as the difference between proceeds received and the fair value of the loan based on prevailing market interest rates. (i) If the Company received grants related to assets Government grants whose primary condition is that the Company purchase, construct or otherwise acquire long-term assets are deducted in calculating the carrying amount of the asset. The grant is recognized in profit or loss over the life of a depreciable asset as a reduced depreciation expense. (ii) If the Company received grants related to income Government grants which are intended to compensate the Company for expenses incurred are recognized as other income (government grants) in profit or loss over the periods in which the Company recognizes the related costs as expenses. (13) Employee benefits When an employee has rendered service to the Company during a period, the Company recognizes the contribution payable to a defined contribution plan in exchange for that service as a liability (accrued expense). For defined benefit pension plans and other post-employment benefits, the net periodic pension expense is actuarially determined by “Pension Actuarial System” developed by independent actuaries using the projected unit credit method. The present value of the defined benefit obligation is determined by discounting the estimated future cash outflows using interest rates of high-quality corporate bonds that are denominated in the currency in which the benefits will be paid and that have terms to maturity approximating the terms of the related pension liability. However, if there is not a deep market, market yields on government bonds are used. Net defined benefit liability’s measurement is composed of actuarial gains and losses, return on plan assets excluding net interest on net defined benefit liability, and any change in the effect of the asset ceiling, excluding net interest, which are immediately recognized in other comprehensive income. The actuarial gains or losses recognized in other comprehensive income which will not be reclassified into net profit or loss for later periods are immediately recognized in retained earnings. Past service cost will be recognized as expenses upon the earlier of the date of change or reduction to the plan, or the date of recognizing termination benefits. The retirement benefit obligation recognized in the statement of financial position represents the present value of the defined benefit obligation as adjusted for unrecognized actuarial gains and losses and unrecognized past service cost, and as reduced by the fair value of plan assets. Any asset resulting from this calculation is limited to unrecognized actuarial losses and past service cost, plus the present value of available refunds and reductions in future contributions to the plan. (14) Income taxes Income tax expense comprises current and deferred tax. Current tax and deferred tax are recognized in profit or loss except to the extent that it relates to a business combination, or items recognized directly in equity or in other comprehensive income. (i) Current tax Current tax is the expected tax payable or receivable on the taxable profit or loss for the year, using tax rates enacted or substantively enacted at the end of the reporting period and any adjustment to tax payable in respect of previous years. The taxable profit is different from the accounting profit for the period since the taxable profit is calculated excluding the temporary differences, which will be taxable or deductible in determining taxable profit (tax loss) of future periods, and non-taxable non-deductible Current tax assets and liabilities are offset only if, the Company: (a) has a legally enforceable right to set off the recognized amounts; and (b) intends either to settle on a net basis, or to realize the asset and settle the liability simultaneously. (ii) Deferred tax Deferred tax is recognized, using the asset-liability method, in respect of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for taxation purposes. A deferred tax liability is recognized for all taxable temporary differences. A deferred tax asset is recognized for all deductible temporary differences to the extent that it is probable that taxable profit will be available against which they can be utilized. However, deferred tax is not recognized for the following temporary differences: taxable temporary differences arising on the initial recognition of goodwill, or the initial recognition of assets or liabilities in a transaction that is not a business combination and that affects neither accounting profit or loss nor taxable income. In certain circumstances such as when accounting for leases or decommissioning costs of nuclear power plants, the carrying amount of the asset recorded is equal to the liability recognized at initial recognition. When recording its deferred tax balances, the Company considers these assets and liabilities separately on a gross basis. Accordingly, the taxable temporary difference relating to the asset and the deductible temporary difference relating to the liability are separately recognized and presented on a net basis in the financial statements. The measurement of deferred tax liabilities and deferred tax assets reflects the tax consequences that would follow from the manner in which the Company expects, at the end of the reporting period, to recover or settle the carrying amount of its assets and liabilities. Deferred tax assets or deferred tax liabilities on investment properties measured at fair value, unless any contrary evidence exists, are measured using the assumption that the carrying amount of the property will be recovered entirely through sale. The Company recognizes a deferred tax liability for all taxable temporary differences associated with investments in subsidiaries, associates, and interests in joint ventures, except to the extent that the Company is able to control the timing of the reversal of the temporary difference and it is probable that the temporary difference will not reverse in the foreseeable future. The Company recognizes a deferred tax asset for all deductible temporary differences arising from investments in subsidiaries and associates, to the extent that it is probable that the temporary difference will reverse in the foreseeable future and taxable profit will be available against which the temporary difference can be utilized. The carrying amount of a deferred tax asset is reviewed at the end of each reporting period and reduces the carrying amount to the extent that it is no longer probable that sufficient taxable profit will be available to allow the benefit of part or all of that deferred tax asset to be utilized. Deferred tax assets and liabilities are measured at the tax rates that are expected to apply to the period when the asset is realized or the liability is settled, based on tax rates (and tax laws) that have been enacted or substantively enacted by the end of the reporting period. The measurement of deferred tax liabilities and deferred tax assets reflects the tax consequences that would follow from the manner in which the Company expects, at the end of the reporting period to recover or settle the carrying amount of its assets and liabilities. Deferred tax assets and liabilities are offset only if there is a legally enforceable right to offset the related current tax liabilities and assets, and they relate to income taxes levied by the same tax authority and they intend to settle current tax liabilities and assets on a net basis. (iii) Current and deferred tax for the year Current and deferred tax are recognized in profit or loss, except when they relate to items that are recognized in other comprehensive income or directly in equity, in which case, the current and deferred tax are also recognized in other comprehensive income or directly in equity respectively. Where current tax or deferred tax arises from the initial accounting for a business combination, the tax effect is included in the accounting for the business combination. (15) Property, plant and equipment Property, plant and equipment are initially measured at cost and after initial recognition, are carried at cost less accumulated depreciation and accumulated impairment losses. The cost of property, plant and equipment includes expenditures arising directly from the construction or acquisition of the asset, any costs directly attributable to bringing the asset to the location and condition necessary for it to be capable of operating in the manner intended by management and the initial estimate of the costs of dismantling and removing the item and restoring the site on which it is located. Subsequent costs are recognized in the carrying amount of property, plant and equipment at cost or, if appropriate, as separate items if it is probable that future economic benefits associated with the item will flow to the Company and the cost of the item can be measured reliably. The carrying amount of the replaced part is derecognized. The costs of the day-to-day Property, plant and equipment, except for land, are depreciated on a straight-line basis over estimated useful lives that appropriately reflect the pattern in which the asset’s future economic benefits are expected to be consumed. For loaded nuclear fuel related to long-term raw materials and spent nucl

Segment, Geographic and Other I

Segment, Geographic and Other Information	12 Months Ended
	Dec. 31, 2019
Segment, Geographic and Other Information [Abstract]
Segment, Geographic and Other Information	4. Segment, Geographic and Other Information (1) Segment determination and explanation of the measurements The Company’s operating segments are its business components that generate discrete financial information that is reported to and regularly reviewed by the Company’s the chief operating decision maker, the Chief Executive Officer, for the purpose of resource allocation and assessment of segment performance. The Company’s reportable segments are ‘Transmission and distribution’, ‘Electric power generation (Nuclear)’, ‘Electric power generation (Non-nuclear)’, Segment operating profit (loss) is determined the same way that consolidated operating profit is determined under IFRS without any adjustment for corporate allocations. The accounting policies used by each segment are consistent with the accounting policies used in the preparation of the consolidated financial statements. Segment assets and liabilities are determined based on separate financial statements of the entities instead of on a consolidated basis. There are various transactions between the reportable segments, including sales of property, plant and equipment and so on, that are conducted on an arm’s-length basis at market prices that would be applicable to an independent third party. For subsidiaries which are in a different segment from that of its immediate parent company, their carrying amount in separate financial statements is eliminated in the consolidating adjustments in the tables below. In addition, consolidation adjustments in the table below include adjustments of the amount of investment in associates and joint ventures from the cost basis amount reflected in segment assets to that determined using equity method in the consolidated financial statements. (2) Financial information of the segments for the years ended December 31, 2017, 2018 and 2019, respectively, are as follows: 2017 Segment Total Intersegment Revenue Depreciation Interest Interest Profit (loss) Employee Loss on Increase in Operating In millions of won Transmission and distribution ￦ 59,486,766 2,044,160 57,442,606 3,466,410 49,987 737,971 (105,166 ) 158,738 384,595 885,195 1,902,634 Electric power generation (Nuclear) 9,415,752 9,359,468 56,284 3,267,510 21,034 487,503 3,637 80,809 — 801,800 1,347,794 Electric power generation (Non-nuclear) 22,795,816 21,885,251 910,565 2,954,375 18,860 486,176 (6,718 ) 94,075 39,335 171,457 1,523,497 Plant maintenance & engineering service 2,621,440 2,211,716 409,724 109,001 10,801 2,967 (70 ) 87,344 161 219,382 265,593 Others 655,062 138,352 516,710 36,001 130,003 103,782 — 861 — (967 ) 113,296 Consolidation adjustments (35,638,947 ) (35,638,947 ) — (59,586 ) (24,542 ) (28,847 ) — (30,467 ) — (386,747 ) 167,055 ￦ 59,335,889 — 59,335,889 9,773,711 206,143 1,789,552 (108,317 ) 391,360 424,091 1,690,120 5,319,869 Finance income 1,530,618 Finance expense (3,127,952 ) Loss related to associates and joint ventures (108,317 ) Profit before income tax ￦ 3,614,218 2018 Segment Total Intersegment Revenue Depreciation Interest Interest Profitrelated Employee Loss on Increase in Operating In millions of won Transmission and distribution ￦ 59,676,952 1,393,120 58,283,832 3,555,158 77,925 708,329 287,268 144,180 424,774 580,931 (1,814,363 ) Electric power generation (Nuclear) 8,858,717 8,833,787 24,930 3,088,019 30,422 503,161 9,946 76,467 38,886 520,167 357,401 Electric power generation (Non-nuclear) 25,204,085 24,389,816 814,269 3,269,023 29,313 577,441 58,993 91,140 17,516 (227,234 ) 482,418 Plant maintenance & engineering service 2,526,126 2,170,959 355,167 114,030 12,505 4,126 1,956 77,526 — 174,785 314,755 Others 996,300 441,436 554,864 55,513 117,878 119,037 — 1,742 — 356 102,421 Consolidation adjustments (37,229,118 ) (37,229,118 ) — (56,949 ) (44,276 ) (43,636 ) — (30,480 ) — 7,989 (127,741 ) ￦ 60,033,062 — 60,033,062 10,024,794 223,767 1,868,458 358,163 360,575 481,176 1,056,994 (685,109 ) Finance income 796,870 Finance expense (2,470,743 ) Gain related to associates and joint ventures 358,163 Loss before income tax ￦ (2,000,819 ) 2019 Segment Total Intersegment Revenue Depreciation Interest Interest Profit/(loss) Employee Loss on Increase in Operating In millions of won Transmission and distribution ￦ 58,328,372 1,336,725 56,991,647 3,814,428 73,478 777,120 140,757 298,144 350,865 987,828 (2,568,529 ) Electric power generation (Nuclear) 8,937,026 8,908,803 28,223 3,227,695 37,277 511,864 (5,497 ) 132,283 — 672,134 782,511 Electric power generation (Non-nuclear) 24,254,957 23,472,153 782,804 3,955,333 35,626 655,466 77,641 163,626 13,364 766,407 551,287 Plant maintenance & engineering service 2,627,539 2,254,841 372,698 125,546 14,214 2,861 1,237 124,745 — 124,242 312,341 Others 1,049,324 656,614 392,710 127,364 141,262 134,248 — 18,409 4 2,408 (489,585 ) Consolidation adjustments (36,629,136 ) (36,629,136 ) — (121,626 ) (33,739 ) (34,748 ) — (12,087 ) — (251,804 ) (295,552 ) ￦ 58,568,082 — 58,568,082 11,128,740 268,118 2,046,811 214,138 725,120 364,233 2,301,215 (1,707,527 ) Finance income 1,009,706 Finance expense (2,782,156 ) Gain related to associates and joint ventures 214,139 Loss before income tax ￦ (3,265,838 ) (3) Information related to segment assets and segment liabilities as of and for the years ended December 31, 2018 and 2019 are as follows: 2018 Segment Segment assets Investments Acquisition of non-current Segment In millions of won Transmission and distribution ￦ 107,486,379 3,671,897 6,323,504 53,404,610 Electric power generation (Nuclear) 55,792,704 43,038 2,187,077 30,484,104 Electric power generation (Non-nuclear) 49,296,392 2,114,203 3,435,222 27,558,156 Plant maintenance & engineering service 3,431,068 49,207 111,393 1,200,390 Others 7,816,885 — 382,978 3,165,286 Segment totals 223,823,428 5,878,345 12,440,174 115,812,546 Consolidation adjustments: Elimination of inter-segment amounts (41,026,970 ) — (62,717 ) (5,055,737 ) Equity method adjustment 964,234 — — — Deferred taxes 2,131 — — (621 ) Others 1,486,238 — — 3,400,111 (38,574,367 ) — (62,717 ) (1,656,247 ) Consolidated totals ￦ 185,249,061 5,878,345 12,377,457 114,156,299 2019 Segment Segment assets Investments Acquisition of non-current Segment In millions of won Transmission and distribution ￦ 109,809,254 3,716,931 6,340,593 58,350,681 Electric power generation (Nuclear) 59,562,190 59,081 2,574,358 33,909,152 Electric power generation (Non-nuclear) 54,758,933 2,088,581 4,955,784 33,117,193 Plant maintenance & engineering service 3,528,879 50,238 95,810 1,124,855 Others 7,833,516 — 344,795 3,531,496 Segment totals 235,492,772 5,914,831 14,311,340 130,033,377 Consolidation adjustments: Elimination of inter-segment amounts (39,207,636 ) — (81,555 ) (6,654,717 ) Equity method adjustment 1,791,844 — — — Deferred taxes 2,048 — — 5,329,158 Others (481,236 ) — — 325 (37,894,980 ) — (81,555 ) (1,325,234 ) Consolidated totals ￦ 197,597,792 5,914,831 14,229,785 128,708,143 (4) Geographic information Electric sales, the main operations of the Company, are conducted in the Republic of Korea. The following information on revenue from external customers and non-current Geographical unit Revenue from external customers Non-current 2017 2018 2019 2017 2018 2019 In millions of won Domestic ￦ 55,652,807 57,799,991 56,942,128 153,436,810 157,037,428 169,366,365 Overseas(*1) 3,683,082 2,233,071 1,625,954 4,497,535 3,299,346 2,743,755 ￦ 59,335,889 60,033,062 58,568,082 157,934,345 160,336,774 172,110,120 (*1) Middle East and other Asian countries make up the majority of overseas revenue and non-current non-current (*2) Amount excludes financial assets and deferred tax assets. (5) Information on significant customers There is no single customer comprising more than 10% of the Company’s revenue for the years ended December 31, 2017, 2018 and 2019.

Classification of Financial Ins

Classification of Financial Instruments	12 Months Ended
	Dec. 31, 2019
Classification of Financial Instruments [Abstract]
Classification of Financial Instruments	5. Classification of Financial Instruments (1) Classification of financial assets as of December 31, 2018 and 2019 are as follows: 2018 Financial assets Financial assets Financial assets Derivative assets Total In millions of won Current assets Cash and cash equivalents ￦ — — 1,358,345 — 1,358,345 Current financial assets Current financial assets at fair value through profit or loss 313,893 — — — 313,893 Current financial assets at amortized costs — — 11,956 — 11,956 Current derivative assets 13,936 — — 28,171 42,107 Other financial assets — — 1,991,939 — 1,991,939 Trade and other receivables — — 7,793,592 — 7,793,592 327,829 — 11,155,832 28,171 11,511,832 Non-current Non-current Non-current 607,042 — — — 607,042 Non-current — 399,495 — — 399,495 Non-current — — 2,086 — 2,086 Non-current 23,695 — — 36,533 60,228 Other financial assets — — 1,044,762 — 1,044,762 Trade and other receivables — — 1,819,845 — 1,819,845 630,737 399,495 2,866,693 36,533 3,933,458 ￦ 958,566 399,495 14,022,525 64,704 15,445,290 2019 Financial assets Financial assets Financial assets Derivative assets Total In millions of won Current assets Cash and cash equivalents ￦ — — 1,810,129 — 1,810,129 Current financial assets Current financial assets at fair value through profit or loss 131,385 — — — 131,385 Current financial assets at amortized costs — — 12,302 — 12,302 Current derivative assets 21 — — 27,597 27,618 Other financial assets — — 1,415,204 — 1,415,204 Trade and other receivables — — 7,701,452 — 7,701,452 131,406 — 10,939,087 27,597 11,098,090 Non-current Non-current Non-current 615,876 — — — 615,876 Non-current — 379,170 — — 379,170 Non-current — — 1,307 — 1,307 Non-current 165,183 — — 118,232 283,415 Other financial assets — — 1,283,730 — 1,283,730 Trade and other receivables — — 2,002,297 — 2,002,297 781,059 379,170 3,287,334 118,232 4,565,795 ￦ 912,465 379,170 14,226,421 145,829 15,663,885 (2) Classification of financial liabilities as of December 31, 2018 and 2019 are as follows: 2018 Financial liabilities at fair value through profit or loss Financial liabilities Derivative liabilities Total In millions of won Current liabilities Borrowings ￦ — 1,172,624 — 1,172,624 Debt securities — 6,788,824 — 6,788,824 Derivative liabilities 13,706 — 6,725 20,431 Trade and other payables — 6,405,395 — 6,405,395 13,706 14,366,843 6,725 14,387,274 Non-current Borrowings — 3,258,015 — 3,258,015 Debt securities — 49,815,164 — 49,815,164 Derivative liabilities 85,304 — 206,428 291,732 Trade and other payables — 2,941,696 — 2,941,696 85,304 56,014,875 206,428 56,306,607 ￦ 99,010 70,381,718 213,153 70,693,881 2019 Financial liabilities at fair value through profit or loss Financial liabilities Derivative liabilities Total In millions of won Current liabilities Borrowings ￦ — 1,315,134 — 1,315,134 Debt securities — 7,542,705 — 7,542,705 Derivative liabilities 13,286 — 59,778 73,064 Trade and other payables — 6,649,402 — 6,649,402 13,286 15,507,241 59,778 15,580,305 Non-current Borrowings — 3,389,743 — 3,389,743 Debt securities — 55,628,959 — 55,628,959 Derivative liabilities 39,861 — 57,035 96,896 Trade and other payables — 6,965,760 — 6,965,760 39,861 65,984,462 57,035 66,081,358 ￦ 53,147 81,491,703 116,813 81,661,663 (3) Classification of comprehensive income (loss) from financial instruments for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 2018 2019 In millions of won Cash and cash equivalents Interest income ￦ 35,474 40,704 42,861 Financial assets at fair value through profit or loss Interest income — 21,713 29,411 Gain on valuation of derivatives — 34,117 151,604 Gain on transaction of derivatives — 39,114 63,329 Gain on valuation of financial assets — 1,879 1,062 Gain on disposal of financial assets — 1,837 1,760 Financial assets at fair value through profit or loss Interest income 290 — — Gain (loss) on valuation of derivatives (214,100 ) — — Loss on transaction of derivatives (37,266 ) — — Gain on valuation of financial assets 12 — — Financial assets at fair value through other comprehensive income Dividends income — 12,777 13,838 Available-for-sale Dividends income 11,477 — — Impairment loss on available-for-sale (2,713 ) — — Gain (loss) on disposal of available-for-sale (1,213 ) — — Financial assets at amortized cost Interest income — 89 539 Held-to-maturity Interest income 82 — — Loans and receivables Interest income 30,014 21,925 63,448 Trade and other receivables Interest income 102,727 90,390 69,941 Short-term financial instruments Interest income 29,412 41,025 49,070 Long-term financial instruments Interest income 8,144 7,920 12,794 Other financial assets Interest income — 1 54 Derivative assets (applying hedge accounting) Gain (loss) on valuation of derivatives (profit or loss) (41,129 ) 69,799 123,730 Gain on valuation of derivatives (equity, before tax) 2,453 8,600 38,305 Gain (loss) on transaction of derivatives (58,299 ) 34,152 65,651 Financial liabilities at fair value through profit or loss Loss on valuation of derivatives — (4,650 ) 27,686 Gain on transaction of derivatives — 36,046 (493 ) Financial liabilities at fair value through profit or loss Gain (loss) on valuation of derivatives (179,879 ) — — Gain (loss) on transaction of derivatives (27,175 ) — — Financial liabilities carried at amortized cost Interest expense of borrowings and debt securities (1,240,727 ) (1,320,516 ) (1,394,328 ) Loss on retirement of financial liabilities (5 ) — — Interest expense of trade and other payables (57,160 ) (42,830 ) (94,019 ) Interest expense of others (491,665 ) (505,112 ) (558,464 ) Gain (loss) on foreign currency transactions and translations 1,075,215 (356,159 ) (406,175 ) Derivative liabilities (applying hedge accounting) Gain (loss) on valuation of derivatives (profit or loss) (439,559 ) 53,937 14,330 Gain (loss) on valuation of derivatives (equity, before tax) 29,431 (15,029 ) (2,578 ) Gain (loss) on transaction of derivatives (46,221 ) 37,985 (42,072 )

Restricted Deposits

Restricted Deposits	12 Months Ended
	Dec. 31, 2019
Restricted Deposits [Abstract]
Restricted Deposits	6. Restricted Deposits Restricted deposits as of December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Cash and cash equivalents Deposits for government project ￦ 12,747 9,287 Collateral provided for borrowings 100,998 63,198 Collateral provided for lawsuit 3 3 Deposits for transmission regional support program 4,337 3,002 Decommissioning costs of nuclear power plants 604 — Short-term financial instruments Restriction on withdrawal related to ‘win-win 34,000 93,000 Current financial assets at fair value through profit or loss Decommissioning costs of nuclear power plants 29,451 — Non-current Decommissioning costs of nuclear power plants 498,555 541,969 Long-term financial instruments Escrow accounts 69 74 Guarantee deposits for banking accounts at oversea branches 315 326 Collateral provided for borrowings — 11,745 Decommissioning costs of nuclear power plants 245,896 250,464 Funds for developing small and medium enterprises(*) 200,000 200,000 ￦ 1,126,975 1,173,068 (*) Deposits for small and medium enterprises at the Industrial Bank of Korea (IBK) and others for construction of Bitgaram Energy Valley businesses as of December 31, 2018 and 2019.

Cash and Cash Equivalents

Cash and Cash Equivalents	12 Months Ended
	Dec. 31, 2019
Cash and Cash Equivalents [Abstract]
Cash and Cash Equivalents	7. Cash and Cash Equivalents Cash and cash equivalents as of December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Cash ￦ 138 266 Other demand deposits 927,650 1,117,499 Short-term deposits classified as cash equivalents 211,424 527,235 Short-term investments classified as cash equivalents 219,133 165,129 ￦ 1,358,345 1,810,129

Trade and Other Receivables

Trade and Other Receivables	12 Months Ended
	Dec. 31, 2019
Trade and Other Receivables [Abstract]
Trade and Other Receivables	8. Trade and Other Receivables (1) Trade and other receivables as of December 31, 2018 and 2019 are as follows: 2018 Gross Allowance for Present value discount Book In millions of won Current assets Trade receivables ￦ 7,303,065 (215,775 ) — 7,087,290 Other receivables 728,560 (20,231 ) (2,027 ) 706,302 8,031,625 (236,006 ) (2,027 ) 7,793,592 Non-current Trade receivables 415,318 (93 ) (448 ) 414,777 Other receivables 1,496,464 (84,495 ) (6,901 ) 1,405,068 1,911,782 (84,588 ) (7,349 ) 1,819,845 ￦ 9,943,407 (320,594 ) (9,376 ) 9,613,437 2019 Gross Allowance for Present value discount Book In millions of won Current assets Trade receivables ￦ 7,147,683 (208,505 ) — 6,939,178 Other receivables 792,147 (27,579 ) (2,294 ) 762,274 7,939,830 (236,084 ) (2,294 ) 7,701,452 Non-current Trade receivables 338,261 (4,254 ) (382 ) 333,625 Other receivables 1,759,930 (86,576 ) (4,682 ) 1,668,672 2,098,191 (90,830 ) (5,064 ) 2,002,297 ￦ 10,038,021 (326,914 ) (7,358 ) 9,703,749 (2) Other receivables as of December 31, 2018 and 2019 are as follows: 2018 Gross Allowance for Present value Book In millions of won Current assets Non-trade ￦ 298,587 (19,940 ) — 278,647 Accrued income 102,023 — — 102,023 Deposits 228,466 — (2,027 ) 226,439 Finance lease receivables 84,688 (291 ) — 84,397 Others 14,796 — — 14,796 728,560 (20,231 ) (2,027 ) 706,302 Non-current Non-trade 136,432 (77,475 ) — 58,957 Deposits 376,211 — (6,901 ) 369,310 Finance lease receivables 898,658 (842 ) — 897,816 Others 85,163 (6,178 ) — 78,985 1,496,464 (84,495 ) (6,901 ) 1,405,068 ￦ 2,225,024 (104,726 ) (8,928 ) 2,111,370 2019 Gross Allowance for Present value Book In millions of won Current assets Non-trade ￦ 376,438 (27,201 ) — 349,237 Accrued income 68,921 — — 68,921 Deposits 273,887 — (2,294 ) 271,593 Finance lease receivables 60,304 (378 ) — 59,926 Others 12,597 — — 12,597 792,147 (27,579 ) (2,294 ) 762,274 Non-current Non-trade 196,821 (78,654 ) — 118,167 Accrued income 2,222 — — 2,222 Deposits 338,989 — (4,682 ) 334,307 Finance lease receivables 1,118,537 (484 ) — 1,118,053 Others 103,361 (7,438 ) — 95,923 1,759,930 (86,576 ) (4,682 ) 1,668,672 ￦ 2,552,077 (114,155 ) (6,976 ) 2,430,946 (3) Trade and other receivables measured at amortized cost No interest is accrued for trade receivables related to electricity for the duration between the billing date and the payment due dates. However, once trade receivables are overdue, the Company imposes a monthly interest rate of 1.5% on the overdue trade receivables. The Company holds deposits of three months’ expected electricity usage for customers requesting temporary usage and customers with delinquent payments. (4) Aging analysis of trade receivables as of December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Trade receivables: (not overdue) ￦ 7,419,648 7,338,757 Trade receivables: (overdue, not impaired) — — Less than 60 days — — Trade receivables: (impairment reviewed) 298,735 147,187 Less than 60 days 2,525 6,555 60 ~ 90 days 37,266 1,899 90 ~ 120 days 16,033 2,106 120 days ~ 1 year 46,204 37,357 Over 1 year 196,707 99,270 7,718,383 7,485,944 Less: allowance for doubtful accounts (215,868 ) (212,759 ) Less: present value discount (448 ) (382 ) ￦ 7,502,067 7,272,803 At the end of each reporting period, the Company assesses whether the credit to trade receivables is impaired. The Company recognizes loss allowances for trade receivables individually when there is any objective evidence that trade receivables are impaired and significant and classifies the trade receivables that are not individually assessed as the trade receivables subject to be assessed on a collective basis. Also, from January 1, 2018, the Company recognizes loss allowances based on an ‘expected credit loss’ (ECL) model. (5) Aging analysis of other receivables as of December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Other receivables: (not overdue) ￦ 2,075,601 2,327,640 Other receivables: (overdue, not impaired) — — Less than 60 days — — Other receivables: (impairment reviewed) 149,423 224,437 Less than 60 days 24,782 98,220 60 ~ 90 days 1,007 2,034 90 ~ 120 days 10,997 14,135 120 days ~ 1 year 23,991 26,212 Over 1 year 88,646 83,836 2,225,024 2,552,077 Less: allowance for doubtful accounts (104,726 ) (114,155 ) Less: present value discount (8,928 ) (6,976 ) ￦ 2,111,370 2,430,946 At the end of each reporting period, the Company assesses whether the credit to other receivables is impaired. The Company recognizes loss allowances for other receivables individually when there is any objective evidence that trade receivables are impaired and significant, and classifies the other receivables that are not individually assessed as the other receivables subject to be assessed on a collective basis. Also, from January 1, 2018, the Company recognizes loss allowances based on an ‘expected credit loss’ (ECL) model. (6) Changes in the allowance for doubtful accounts for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 2018 2019 Trade Other Trade Other Trade Other In millions of won Beginning balance ￦ 71,985 87,661 173,583 78,008 215,868 104,726 Effect of change in accounting policy — — 6,641 128 — — Loss allowance as at January 1 under IFRS 9 — — 180,224 78,136 215,868 104,726 Bad debt expense 126,714 1,778 41,498 17,817 29,221 19,206 Write-off (32,995 ) (3,129 ) (7,696 ) (244 ) (10,106 ) (1,146 ) Reversal — (2,166 ) (1,726 ) (143 ) (41,940 ) — Others 7,879 (6,136 ) 3,568 9,160 19,716 (8,631 ) Ending balance ￦ 173,583 78,008 215,868 104,726 212,759 114,155

Financial Assets at Fair Value

Financial Assets at Fair Value through Profit or Loss	12 Months Ended
	Dec. 31, 2019
Financial assets at fair value through profit or loss [Abstract]
Financial Assets At Fair Value Through Profit Or Loss	9. Financial Assets at Fair Value through Profit or Loss (1) Financial assets at fair value through profit or loss as of December 31, 2018 and 2019 are as follows: 2018 2019 Current Non-current Current Non-current In millions of won Financial assets at fair value through profit or loss Beneficiary certificate ￦ 100 320,148 894 160,952 Cooperative — 5,052 — 5,155 Other 313,793 83,586 130,491 244,857 313,893 408,786 131,385 410,964 Financial assets designated as at fair value through profit or loss Debt with embedded derivatives — 187,483 — 150,916 Other — 10,773 — 53,996 — 198,256 — 204,912 ￦ 313,893 607,042 131,385 615,876 (2) Details of gain (loss) from financial assets at fair value through profit or loss for the years ended December 31, 2019 and 2018 are as follows: 2018 2019 In millions of won Beneficiary certificate ￦ 6,892 12,458 Cooperative 626 76 Debt with embedded derivatives 4,804 2,697 Other 13,108 17,002 ￦ 25,430 32,233

Financial Assets at Fair Valu_2

Financial Assets at Fair Value through Other Comprehensive Income	12 Months Ended
	Dec. 31, 2019
Financial assets at fair value through other comprehensive income [Abstract]
Financial Assets At Fair Value Through Other Comprehensive Income	10. Financial Assets at Fair Value through Other Comprehensive Income (1) Changes in financial assets at fair value through other comprehensive income for the years ended December 31, 2018 and 2019 are as follows: 2018 Beginning Effect of accounting policy Acquisition Disposal Valuation Impairment Others Ending In millions of won Listed ￦ — 274,453 — (1 ) (63,007 ) — (1,389 ) 210,056 Unlisted — 197,450 — — (12,070 ) — 4,059 189,439 ￦ — 471,903 — (1 ) (75,077 ) — 2,670 399,495 Current financial assets at fair value through other comprehensive income ￦ — — — — — — — — Non-current — 471,903 — (1 ) (75,077 ) — 2,670 399,495 2019 Beginning Acquisition Disposal Valuation Impairment Others Ending In millions of won Listed ￦ 210,055 — — (11,734 ) — 2,880 201,201 Unlisted 189,439 1,876 (19,315 ) 3,715 — 2,254 177,969 ￦ 399,494 1,876 (19,315 ) (8,019 ) — 5,134 379,170 Current financial assets at fair value through other comprehensive income ￦ — — — — — — — Non-current 399,494 1,876 (19,315 ) (8,019 ) — 5,134 379,170 (2) Financial assets at fair value through other comprehensive income as of December 31, 2018 and 2019 are as follows: 2018 Shares Ownership Acquisition Book value Fair value In millions of won Listed Korea District Heating Corp. 2,264,068 19.55 % ￦ 173,201 129,051 129,051 Ssangyong Motor Co., Ltd. 38,568 0.03 % 428 153 153 SM Korea Line Corp. 18 0.00 % 1 — — Namkwang Engineering & Construction Co., Ltd. 121 0.00 % 15 1 1 Bumyang Construction Co., Ltd. 35 0.00 % 2 — — ELCOMTEC Co., Ltd. 32,875 0.04 % 217 61 61 PAN ocean Co., Ltd. 1,492 0.00 % 14 7 7 Dongbu Corp. 955 0.02 % 12 7 7 KSP Co., Ltd. 22,539 0.08 % 24 32 32 STX Heavy Industries Co., Ltd. 5,057 0.13 % 191 29 29 Codes Combine Co., Ltd. 291 0.00 % 1 1 1 PT Adaro Energy Tbk 480,000,000 1.50 % 71,554 44,790 44,790 Energy Fuels Inc. 1,711,814 1.91 % 16,819 5,435 5,435 Bunji Corporation Limited (formerly, Baralaba Coal Company Limited) 99,763 0.07 % 18,445 — — Denison Mines Corp. 58,284,000 10.42 % 84,134 30,122 30,122 Fission 3.0(*6) 75,000 0.14 % — 13 13 Fission Uranium Corp. 800,000 0.16 % 785 354 354 365,843 210,056 210,056 Unlisted Intellectual Discovery Co., Ltd. 1,000,000 8.81 % ￦ 5,000 954 954 Hwan Young Steel Co., Ltd. 10,916 0.14 % 1,092 97 97 SAMBO AUTO. Co., Ltd. 15,066 0.02 % 38 38 38 Mobo Co., Ltd. 504 0.00 % 14 14 14 Dae Kwang Semiconductor Co., Ltd. 589 0.07 % 6 6 6 Sanbon Department Store 828 0.01 % 124 3 3 Miju Steel Mfg. Co., Ltd. 1,097 0.23 % 50 50 50 Sungwon Co., Ltd.(*7) 117 0.07 % 15 15 15 Hana Civil Engineering Co., Ltd. 23 0.00 % 1 1 1 KC Development Co., Ltd. 839 0.02 % 6 6 6 IMHWA Corp. 329 0.11 % 5 5 5 DALIM Special Vehicle Co., Ltd. 58 0.08 % 10 10 10 ASA JEONJU Co., Ltd. 34,846 1.34 % 697 69 69 Moonkyung Silica Co., Ltd. 42 0.56 % — — — Sungkwang Timber Co., Ltd. 9 0.34 % 4 4 4 Yongbo Co., Ltd. 61 0.20 % 3 3 3 HJ Steel Co., Ltd. 218 0.07 % 2 2 2 KS Remicon Co., Ltd. 12 0.04 % 3 3 3 Joongang Platec Co., Ltd. 3,591 0.75 % 72 35 35 Pyungsan SI Ltd. 434 0.01 % 9 9 9 Samgong Development Co., Ltd. 12 0.01 % 7 7 7 Joongang Development Co., Ltd. 540 0.12 % 8 8 8 2018 Shares Ownership Acquisition Book value Fair value In millions of won AJS Co., Ltd. 12,906 0.23 % ￦ 32 32 32 SHIN-E 119 0.13 % 10 — — MSE Co., Ltd. 429 0.13 % 9 9 9 Ilrim Nano Tec Co., Ltd. 1,520 0.07 % 15 15 15 Youngjin Hi-Tech 2,512 0.25 % 126 21 21 Buyoung Co., Ltd. 270 0.00 % 3 3 3 Ilsuk Co., Ltd. 152 0.17 % 10 10 10 Dongyang Telecom Co., Ltd. 1,760 0.01 % 11 11 11 Jongwon Remicon Co., Ltd. 31 0.18 % 13 13 13 Zyle Daewoo Motor Sales Co., Ltd. 22 0.00 % — — — Daewoo Development Co., Ltd. 8 0.00 % — — — Seyang Inc. 537 0.05 % 27 27 27 Seungri Enterprise Co., Ltd. 93 0.05 % 3 3 3 Onggane Food Co., Ltd 5 0.07 % 1 1 1 Shin-E 1,569 0.64 % 111 3 3 Ejung Ad Co., Ltd. 132 0.09 % 3 3 3 Solvus Co., Ltd. 1,056 0.04 % 3 3 3 Myung Co., Ltd. 89 0.05 % 2 2 2 Shinil Engineering Co., Ltd. 887 0.06 % 3 3 3 Biwang Industry Co., Ltd 406 0.04 % 2 2 2 Huimun Co., Ltd. 263 0.26 % 4 4 4 Young Sung Co., Ltd. 89 0.40 % 26 26 26 Yuil Industrial Electronics Co., Ltd. 804 0.32 % 15 15 15 DN TEK Inc. 12,401 0.29 % 61 5 5 Kwang Jin Structure Co., Ltd. 3,072 0.60 % 31 31 31 Woojin Industry Corporation 3 0.00 % 16 16 16 Kwang Sung Industry Co., Ltd. 325 0.35 % 7 7 7 Futech Mold Co., Ltd. 274 0.27 % 14 14 14 Woojoo Environment Ind. Co., Ltd. 101 0.11 % 13 13 13 Hyungji Esquire Co., Ltd. 61 0.02 % 22 22 22 Kolmar Pharma Co., Ltd. 1,426 0.01 % 52 3 3 Morado Co., Ltd. 209 0.04 % 2 2 2 Myung Sung Tex Co., Ltd. 20 0.00 % 2 2 2 Kwang Sung Co., Ltd. 610 0.53 % 31 31 31 Seen Business and Technology co., Ltd. (formerly, EverTechno. Co.,Ltd.) 29,424 0.73 % 148 7 7 Autowel Co.,Ltd. 260 0.38 % 14 14 14 Woobang Construction Co., Ltd. 8 0.00 % 8 8 8 Shin Pyung Co., Ltd. 6 0.03 % 3 3 3 JMC Heavy Industries Co., Ltd. 2,724 0.10 % 27 2 2 Najin Steel Co., Ltd. 37 0.06 % 5 5 5 Sinkwang Industry Co., Ltd. 1,091 1.68 % 5 5 5 Crystal Co., Ltd. 22 0.07 % 2 2 2 2018 Shares Ownership Acquisition Book value Fair value In millions of won Elephant & Friends Co., Ltd. 563 0.61 % ￦ 3 3 3 Mireco Co., Ltd. 109 0.25 % 11 11 11 L&K Industry Co., Ltd. 1,615 0.60 % 24 24 24 JO Tech Co., Ltd. 1,263 0.62 % 25 25 25 Kendae Printing Co., Ltd. 422 0.60 % 21 21 21 Dauning Co., Ltd. 231 0.41 % 6 6 6 Korea Trecision Co., Ltd. 22 0.45 % 5 5 5 Ace Track Co., Ltd. 3,130 1.08 % 219 59 59 Yoo-A 105 0.20 % 11 11 11 Dung Hwan Co., Ltd. 531 0.02 % 5 5 5 Hurim Biocell Co., Ltd. 1,021 0.00 % 5 5 5 Smart Power Co.,Ltd. 133,333 4.35 % 200 200 200 Sunjin Power Tech Co., Ltd. 4,941 0.92 % 247 32 32 Haseung Industries Co.,Ltd. 55 0.62 % 28 28 28 Beer Yeast Korea Inc. 1,388 0.43 % 7 7 7 Korea Bio Red Ginseng Co.,Ltd. 194 0.09 % 10 10 10 B CON Co.,Ltd. 96 1.16 % 6 6 6 SsangMa Machine Co., Ltd. 4 0.05 % 1 1 1 Ace Integration Co., Ltd 105 0.09 % 24 24 24 AceInti Agricultural Co., Ltd. 16 0.02 % 5 5 5 KyungDong Co., Ltd. 130 0.01 % 1 1 1 ChunWon Development Co., Ltd. 193 0.19 % 39 39 39 WonIl Co., Ltd. 999 0.15 % 50 50 50 SungLim Industrial Co., Ltd. 29 0.03 % 1 1 1 Korea Minerals Co., Ltd. 191 0.05 % 134 1 1 HyoDong Development Co., Ltd. 119 0.15 % 24 24 24 Haspe Tech Co., Ltd. 652 0.55 % 20 20 20 JoHyun Co., Ltd. 350 1.56 % 18 18 18 KC Co., Ltd. 5,107 0.17 % 26 26 26 SeongJi Industrial Co.,Ltd. 41 0.05 % 1 1 1 Dong Yang Metal Co., Ltd. 2,951 1.97 % 161 147 147 Seyang Precision Ind.Co., Ltd. 829 0.23 % 41 41 41 Dooriwon Food System Co., Ltd. 13 0.27 % 1 1 1 ShinShin Co., Ltd 339 1.12 % 17 17 17 Kitorang Co., Ltd. 165 0.24 % 49 49 49 Sung Kwang Co., Ltd. 23 0.37 % 6 6 6 Shinheung petrol. Co. Ltd. 699 0.14 % 35 35 35 Force TEC Co., Ltd. 3,501 0.02 % 18 18 18 Samsung Tech Co., Ltd. 486 1.28 % 97 36 36 Tae Hyung Co., Ltd. 28 0.43 % 20 20 20 Samyangplant Co., Ltd. 323 0.60 % 16 16 16 Younil Metal Co., Ltd. 41 0.21 % 21 21 21 Myungjin Tech Co., Ltd. 20 0.54 % 4 4 4 2018 Shares Ownership Acquisition Book value Fair value In millions of won Hankook Precision Ind Co., Ltd. 110 0.06 % ￦ 11 11 11 Borneo International Furniture Co., Ltd.(*4) 4,000 0.16 % 97 13 13 CJ Paradise Co.,Ltd 24 0.02 % 12 12 12 Han Young Technology Company Co.,Ltd. 35 0.00 % — — — STX Offshore & Shipbuilding Co., Ltd 8,622 0.25 % 1,078 1,078 1,078 Ptotronics Co., Ltd. 843 0.42 % 84 6 6 NFT Co., Ltd. 136 0.40 % 8 8 8 Echoroba Co.,Ltd. 157 0.02 % 3 3 3 Hyundaitech Co.,Ltd. 1,363 0.87 % 27 27 27 Dasan Material Co.Ltd. 29 0.04 % 22 22 22 Fish World Co.,Ltd. 47 0.21 % 2 2 2 SG Shinsung Engineering and Construction Co., Ltd. 10 0.00 % 6 6 6 Samdo Industry Electric Co.,Ltd. 48 0.02 % 1 1 1 Taejung Industries Co.,Ltd. 9,268 0.30 % 5 5 5 Shinsei Trading Co., Ltd. 64 0.72 % 6 6 6 Dynamic Co., Ltd. 111 0.19 % 3 3 3 Green Alchemy Co.,Ltd. 38,202 1.48 % 191 17 17 Youone TBM Engineering & Construction Co., Ltd. 615 0.27 % 31 31 31 KM Leatech Co., Ltd. 1,648 0.98 % 8 8 8 Wonil T&I Co., Ltd. 229 0.17 % 23 23 23 Semist Co.,Ltd. 555 0.80 % 3 3 3 DS POWER Co., Ltd. 580,000 2.34 % 2,900 916 916 Sewon Bus Co.,Ltd 12 0.00 % — — — Enertec Co., Ltd. 7,937 0.19 % 44 44 44 Sangji Co., Ltd. 20 0.26 % 4 4 4 Bellie Doughnuts Co., Ltd. 64 0.07 % 4 4 4 Possbell Engineering Co., Ltd. 36 0.64 % 1 1 1 AIRTECH Information communication Co., Ltd 2,379 0.60 % 12 12 12 CST co.,ltd. 4,998 0.28 % 100 100 100 TN Inc. 1,416 2.00 % 71 71 71 Shin kwang Industrial Co., Ltd. 884 0.35 % 55 55 55 Kiscom Co., Ltd. 1,493 0.04 % 1 1 1 Seil Electronics Co.,Ltd. 2,285 0.41 % 286 286 286 Wonil laser Co., Ltd 157 0.37 % 16 16 16 Pyung Hwa Industrial Co.,Ltd. 3,388 3.00 % 85 85 85 Navanakorn Electric Co., Ltd.(*2) 4,442,800 26.93 % 17,216 17,126 17,126 PT. Kedap Saayq 671 10.00 % 18,540 — — Set Holding(*3) 1,100,220 2.50 % 229,255 161,983 161,983 PT. Cirebon Energi Prasarana 22,420 10.00 % 2,612 2,507 2,507 KODE NOVUS 1 LLC(*5) — 10.00 % — — — Choheung packing Co.,Ltd. 61 0.13 % 12 12 12 2018 Shares Ownership Acquisition Book value Fair value In millions of won Jaewoo Co., Ltd. 359 0.24 % ￦ 11 11 11 Wooyang HC Co., Ltd(*8) 1,375 0.01 % 159 159 159 Sungsan Parts Co., Ltd. 629 0.80 % 63 63 63 KMT Co., Ltd. 1,411 0.93 % 21 21 21 TheYeonriji Co., Ltd. 116 0.10 % 6 6 6 Flusys Co., Ltd. 9 0.08 % 2 2 2 DaeSung Frontier Co., Ltd. 2,203 1.11 % 221 221 221 DongSeo Electronics Co., Ltd. 323 0.07 % 16 16 16 Daewoo Display Co., Ltd. 177 0.03 % 5 5 5 Yeong-gwang Remicon Co., Ltd. 15 0.12 % 2 2 2 NTS Co., Ltd. 143 0.22 % 36 36 36 AID CO.,LTD. 1,212 0.57 % 36 36 36 Changwon Eco-friendly 3 0.01 % — — — Kumo Hitech Co., Ltd. 6,697 0.53 % 100 100 100 Kyung Pyo Industry Co., Ltd. 186 0.76 % 19 19 19 Daedong Industry Co., Ltd. 617 0.55 % 46 46 46 Doosung Heavy Industries Co., Ltd. 53 0.06 % 5 5 5 Jangback Testiles Co., Ltd. 494 5.05 % 49 49 49 Samjoo Hightech Co., Ltd. 522 0.08 % 3 3 3 Samkwang Chemical Co., Ltd. 204 1.27 % 51 51 51 Taekwang Industry Co., Ltd. 1,327 0.48 % 93 93 93 Taekwang Precision Co., Ltd. 54 0.47 % 54 54 54 SG Corp. 213 0.54 % 21 21 21 Shinseung Chemical Industy Co., Ltd. 5 0.01 % 60 60 60 KJ Alloy Co., Ltd. 368 0.20 % 7 7 7 SM Hi-tech 22 0.39 % 22 22 22 Keum Mun Industry Co., Ltd. 1,320 0.97 % 330 330 330 Puruen Environment Co., Ltd. 967 1.34 % 19 19 19 Miretech Co., Ltd. 9,111 0.27 % 18 18 18 SIE Co., Ltd. 12 0.02 % 1 1 1 Soongwon Ind. Co., Ltd. 150 0.40 % 53 53 53 Sejin Hightech Co., Ltd. 17,980 0.16 % 18 18 18 Namcheong Corp. 7,096 0.28 % 284 284 284 Eun Sung Enterprise Co. 1,131 0.72 % 17 17 17 Dongdo Basalt Industry Co., Ltd. 182 1.50 % 73 73 73 Shinyoung Textiles Co., Ltd. 523 1.01 % 52 52 52 Bugook Cast Iron Co. 135 0.71 % 14 14 14 Ilwoo Steel Co., Ltd. 41 0.28 % 17 17 17 Dong-un 1,159 6.28 % 81 81 81 Wongwang Door Corp. 575 1.00 % 29 29 29 284,670 189,439 189,439 — ￦ 650,513 399,495 399,495 (*1) The Company used initial cost as their fair value because there was not enough information to determine fair value, and the range of the estimated fair value is wide. (*2) Although the Company holds more than 20% of the equity shares of these investments, the Company is unable to exercise significant influence. (*3) The Company has estimated the fair value of Set Holding by using the discounted cash flow method and has recognized the difference between its fair value and book value as gain or loss on valuation of available-for-sale (*4) The number of shares owned has changed due to capital reduction without refund (3:1), consolidation of stocks (10,000:1), and split of stock (1:2,000) during the year ended December 31, 2018. (*5) As described in note 20, this is reclassified to financial assets at fair value through other comprehensive income due to loss of significant influence of the Company. (*6) The number of shares owned has changed due to the stock merge (4:1) during the year ended December 31, 2018. (*7) The number of shares owned has changed due to the stock merge (5:1) during the year ended December 31, 2018. (*8) The number of shares owned has changed due to the stock merge (10:1) during the year ended December 31, 2018. 2019 Shares Ownership Acquisition Book value Fair value In millions of won Listed Korea District Heating Corp. 2,264,068 19.55 % ￦ 173,201 107,090 107,090 Ssangyong Motor Co., Ltd. 38,568 0.03 % 428 80 80 SM Korea Line Corp. 18 0.00 % 1 — — Namkwang Engineering & Construction Co., Ltd. 121 0.00 % 15 1 1 Bumyang Construction Co., Ltd. 35 0.00 % 2 — — ELCOMTEC Co., Ltd. 32,875 0.04 % 217 52 52 PAN Ocean Co., Ltd. 1,492 0.00 % 14 7 7 Dongbu Corp. 955 0.00 % 12 8 8 KSP Co., Ltd. 22,539 0.06 % 24 40 40 STX Heavy Industries Co., Ltd. 8,639 0.03 % 213 26 26 Codes Combine Co., Ltd. 291 0.00 % 1 1 1 PT Adaro Energy Tbk 480,000,000 1.50 % 65,028 62,026 62,026 Energy Fuels Inc. 1,711,814 1.91 % 16,819 3,764 3,764 Bunji Corporation Limited (formerly, Baralaba Coal Company Limited) 99,763 0.07 % 18,445 — — Denison Mines Corp. 58,284,000 10.42 % 84,134 27,903 27,903 Fission 3.0 75,000 0.14 % — 5 5 Fission Uranium Corp. 800,000 0.16 % 785 199 199 359,339 201,202 201,202 2019 Shares Ownership Acquisition Book value Fair value In millions of won Unlisted Intellectual Discovery Co., Ltd. 1,000,000 6.00 % ￦ 5,000 954 954 Hwan Young Steel Co., Ltd. 10,916 0.14 % 1,092 97 97 SAMBO AUTO. Co., Ltd. 15,066 0.02 % 38 38 38 Mobo Co., Ltd. 504 0.00 % 14 14 14 Dae Kwang Semiconductor Co., Ltd. 589 0.07 % 6 6 6 Sanbon Department Store 828 0.01 % 124 3 3 Miju Steel Mfg. Co., Ltd. 1,097 0.23 % 50 50 50 Sungwon Co., Ltd. 117 0.07 % 15 15 15 Hana Civil Engineering Co., Ltd. 23 0.00 % 1 1 1 KC Development Co., Ltd. 839 0.02 % 6 6 6 IMHWA Corp. 329 0.11 % 5 5 5 DALIM Special Vehicle Co., Ltd. 58 0.08 % 10 10 10 ASA JEONJU Co., Ltd. 34,846 1.34 % 697 69 69 Moonkyung Silica Co., Ltd. 42 0.56 % — — — Sungkwang Timber Co., Ltd. 3 0.08 % 5 5 5 Yongbo Co., Ltd. 61 0.20 % 3 3 3 HJ Steel Co., Ltd. 218 0.07 % 2 2 2 KS Remicon Co., Ltd. 12 0.04 % 3 3 3 Joongang Platec Co., Ltd. 3,591 0.75 % 72 35 35 Pyungsan SI Co., Ltd. 434 0.01 % 9 9 9 Samgong Development Co., Ltd. 12 0.01 % 7 7 7 Joongang Development Co., Ltd. 540 0.12 % 8 8 8 AJS Co., Ltd. 12,906 0.23 % 32 32 32 MSE Co., Ltd. 429 0.13 % 9 9 9 Ilrim Nano Tec Co., Ltd. 1,520 0.07 % 15 15 15 Youngjin Hi-Tech 2,512 0.25 % 126 21 21 Buyoung Co., Ltd. 270 0.00 % 3 3 3 Ilsuk Co., Ltd. 152 0.17 % 10 10 10 Dongyang Telecom Co., Ltd. 1,760 0.01 % 11 11 11 Jongwon Remicon Co., Ltd. 31 0.18 % 13 13 13 Zyle Daewoo Motor Sales Co., Ltd. 22 0.00 % — — — Daewoo Development Co., Ltd. 8 0.00 % — — — Seyang Inc. 537 0.05 % 27 27 27 Seungri Enterprise Co., Ltd. 93 0.05 % 3 3 3 Onggane Food Co., Ltd 5 0.07 % 1 1 1 Shin-E 1,569 0.64 % 111 3 3 Ejung Ad Co., Ltd. 132 0.09 % 3 3 3 Solvus Co., Ltd. 1,056 0.04 % 3 3 3 Myung Co., Ltd. 89 0.05 % 2 2 2 Shinil Engineering Co., Ltd. 887 0.06 % 3 3 3 Biwang Industry Co., Ltd 406 0.04 % 2 2 2 Young Sung Co., Ltd. 89 0.40 % 27 27 27 2019 Shares Ownership Acquisition Book value Fair value In millions of won Yuil Industrial Electronics Co., Ltd. 804 0.32 % ￦ 16 16 16 DN TEK Inc. 12,401 0.29 % 62 6 6 Woojin Industry Corporation 3 0.00 % 16 16 16 Kwang Sung Industry Co., Ltd. 325 0.35 % 7 7 7 Futech Mold Co., Ltd. 274 0.27 % 14 14 14 Woojoo Environment Ind. Co., Ltd. 101 0.11 % 13 13 13 Hyungji Esquire Co., Ltd. 61 0.02 % 22 22 22 Kolmar Pharma Co., Ltd. 1,426 0.01 % 52 3 3 Morado Co., Ltd. 209 0.04 % 2 2 2 Myung Sung Tex Co., Ltd. 20 0.00 % 2 2 2 Kwang Sung Co., Ltd. 610 0.53 % 31 31 31 Seen Business and Technology co., Ltd. 29,424 0.73 % 147 7 7 Woobang Construction Co., Ltd. 8 0.00 % 8 8 8 Shin Pyung Co., Ltd. 6 0.03 % 3 3 3 JMC Heavy Industries Co., Ltd. 2,724 0.10 % 27 2 2 Najin Steel Co., Ltd. 37 0.06 % 5 5 5 Sinkwang Industry Co., Ltd. 1,091 1.68 % 5 5 5 Elephant & Friends Co., Ltd. 563 0.61 % 3 3 3 Mireco Co., Ltd. 109 0.25 % 11 11 11 L&K Industry Co., Ltd. 1,615 0.60 % 24 24 24 JO Tech Co., Ltd. 1,263 0.62 % 25 25 25 Kendae Printing Co., Ltd. 422 0.60 % 21 21 21 Dauning Co., Ltd. 231 0.41 % 6 6 6 Korea Trecision Co., Ltd. 22 0.45 % 5 5 5 Ace Track Co., Ltd. 3,130 1.08 % 219 59 59 Yoo-A 105 0.20 % 11 11 11 Dung Hwan Co., Ltd. 531 0.02 % 5 5 5 Hurim Biocell Co., Ltd. 1,021 0.00 % 5 5 5 Smart Power Co.,Ltd. 133,333 4.14 % 200 200 200 Sunjin Power Tech Co., Ltd. 4,941 0.92 % 247 32 32 Haseung Industries Co.,Ltd. 55 0.62 % 28 28 28 Beer Yeast Korea Inc. 1,388 0.43 % 7 7 7 B CON Co.,Ltd. 96 1.16 % 6 6 6 Ace Integration Co., Ltd 105 0.09 % 23 23 23 AceInti Agricultural Co., Ltd. 16 0.02 % 5 5 5 KyungDong Co., Ltd. 130 0.01 % 1 1 1 ChunWon Development Co., Ltd. 193 0.19 % 39 39 39 SungLim Industrial Co., Ltd. 29 0.03 % 1 1 1 Korea Minerals Co., Ltd. 191 0.05 % 135 1 1 HyoDong Development Co., Ltd. 128 0.15 % 25 25 25 Haspe Tech Co., Ltd. 652 0.55 % 20 20 20 JoHyun Co., Ltd. 350 1.56 % 18 18 18 KC Co., Ltd. 5,107 0.17 % 26 26 26 2019 Shares Ownership Acquisition Book value Fair value In millions of won SeongJi Industrial Co.,Ltd. 41 0.05 % ￦ 1 1 1 Dong Yang Metal Co., Ltd. 2,951 1.97 % 161 148 148 Seyang Precision Ind.Co., Ltd. 829 0.23 % 41 41 41 Dooriwon Food System Co., Ltd. 13 0.27 % 1 1 1 ShinShin Co., Ltd 339 1.12 % 17 17 17 Sung Kwang Co., Ltd. 23 0.37 % 6 6 6 Shinheung petrol. Co., Ltd. 699 0.14 % 35 35 35 Force TEC Co., Ltd. 3,501 0.02 % 18 18 18 Samsung Tech Co., Ltd. 486 1.28 % 97 36 36 Tae Hyung Co., Ltd. 28 0.43 % 20 20 20 Younil Metal Co., Ltd. 41 0.21 % 21 21 21 Hankook Precision Ind Co., Ltd. 110 0.06 % 11 3 3 Borneo International Furniture Co., Ltd. 4,000 0.16 % 97 13 13 CJ Paradise Co.,Ltd 24 0.02 % 12 12 12 Han Young Technology Company Co.,Ltd. 35 0.00 % — — — STX Offshore & Shipbuilding Co., Ltd 8,622 0.25 % 1,078 1,078 1,078 Ptotronics Co., Ltd. 843 0.42 % 84 6 6 NFT Co., Ltd. 136 0.40 % 8 8 8 Echoroba Co.,Ltd. 157 0.02 % 3 3 3 Hyundaitech Co.,Ltd. 1,363 0.87 % 27 27 27 Dasan Material Co., Ltd. 29 0.04 % 22 22 22 Fish World Co.,Ltd. 47 0.21 % 2 2 2 SG Shinsung Engineering and Construction Co., Ltd. 10 0.00 % 6 6 6 Samdo Industry Electric Co.,Ltd. 48 0.02 % 1 1 1 Taejung Industries Co.,Ltd. 9,268 0.30 % 5 5 5 Shinsei Trading Co., Ltd. 64 0.72 % 6 6 6 Dynamic Co., Ltd. 111 0.19 % 3 3 3 Green Alchemy Co.,Ltd. 38,202 1.48 % 191 17 17 Youone TBM Engineering & Construction Co., Ltd. 615 0.27 % 31 31 31 KM Leatech Co., Ltd. 1,648 0.98 % 8 8 8 Semist Co.,Ltd. 555 0.80 % 3 3 3 Sewon Bus Co.,Ltd 12 0.00 % — — — Enertec Co., Ltd. 7,937 0.19 % 44 44 44 Sangji Co., Ltd. 20 0.26 % 4 4 4 Bellie Doughnuts Co., Ltd. 64 0.07 % 4 4 4 Possbell Engineering Co., Ltd. 36 0.64 % 1 1 1 AIRTECH Information communication Co., Ltd 2,379 0.60 % 12 12 12 Shin kwang Industrial Co., Ltd. 884 0.35 % 55 55 55 Kiscom Co., Ltd. 1,493 0.04 % 1 1 1 Wonil laser Co., Ltd 157 0.37 % 16 16 16 2019 Shares Ownership Acquisition Book value Fair value In millions of won Pyung Hwa Industrial Co.,Ltd. 3,388 3.00 % ￦ 85 85 85 PT. Kedap Saayq 671 10.00 % 18,540 — — Set Holding(*2) 1,100,220 2.50 % 229,255 166,863 166,863 PT. Cirebon Energi Prasarana 22,420 10.00 % 2,612 2,596 2,596 Choheung Packing Co., Ltd. 61 0.13 % 12 12 12 Jaewoo Co., Ltd. 359 0.24 % 11 11 11 Wooyang HC Co., Ltd 1,375 0.01 % 159 159 159 Sungsan Parts Co., Ltd. 629 0.80 % 63 63 63 KMT Co., Ltd. 1,411 0.93 % 21 21 21 TheYeonriji Co., Ltd. 116 0.10 % 6 6 6 Flusys Co., Ltd. 9 0.08 % 2 2 2 DongSeo Electronics Co., Ltd. 323 0.07 % 16 16 16 Daewoo Display Co., Ltd. 177 0.03 % 5 5 5 Yeong-gwang Remicon Co., Ltd. 15 0.12 % 2 2 2 NTS Co., Ltd. 143 0.22 % 36 36 36 AID Co., Ltd. 1,212 0.57 % 36 36 36 Changwon Eco-friendly 3 0.01 % — — — Kumo Hitech Co., Ltd. 6,697 0.53 % 100 100 100 Kyung Pyo Industry Co., Ltd. 186 0.76 % 19 19 19 Daedong Industry Co., Ltd. 617 0.55 % 46 46 46 Doosung Heavy Industries Co., Ltd. 53 0.06 % 5 5 5 Samjoo Hightech Co., Ltd. 522 0.08 % 3 3 3 Samkwang Chemical Co., Ltd. 204 1.27 % 51 51 51 SG Corp. 213 0.54 % 21 21 21 Shinseung Chemical Industy Co., Ltd. 5 0.01 % 60 60 60 KJ Alloy Co., Ltd. 368 0.20 % 7 7 7 SM Hi-tech 22 0.39 % 22 22 22 Keum Mun Industry Co., Ltd. 1,320 0.97 % 330 56 56 Puruen Environment Co., Ltd. 967 1.34 % 19 19 19 Miretech Co., Ltd. 9,111 0.27 % 18 18 18 SIE Co., Ltd. 12 0.02 % 1 1 1 Sejin Hightech Co., Ltd. 17,980 0.16 % 18 18 18 Namcheong Corp. 7,096 0.28 % 284 11 11 Eun Sung Enterprise Co. 1,131 0.72 % 17 17 17 Dongdo Basalt Industry Co., Ltd. 182 1.50 % 73 73 73 Shinyoung Textiles Co., Ltd. 523 1.01 % 52 23 23 Bugook Cast Iron Co. 135 0.71 % 14 14 14 Ilwoo Steel Co., Ltd. 41 0.28 % 17 17 17 Dong-un 1,159 6.28 % 81 81 81 Wongwang Door Corp. 575 1.00 % 29 29 29 Seobu Highway Solar Co., Ltd. 19,460 10.00 % 192 192 192 Dongbu Highway Solar Co., Ltd. 19,020 4.99 % 192 192 192 Muan sunshine solar power plant 298,300 19.00 % 1,492 1,492 1,492 2019 Shares Ownership Acquisition Book value Fair value In millions of won Mansu Co.,Ltd. 344 0.25 % ￦ 15 15 15 Eanskorea Co., Ltd. 39 0.05 % 2 2 2 Youngdongseafood Co., Ltd. 165 0.33 % 8 8 8 Hyunwoo Winstar Co., Ltd. 1 0.00 % — — — Sehwa Diecasting Co., Ltd. 299 1.66 % 44 44 44 Sungchang Tech Co., Ltd. 159 0.31 % 10 10 10 Yuchang Industry Co., Ltd. 90 0.11 % 5 5 5 Jeongpum Co., Ltd. 322 0.35 % 16 16 16 Korea Steel Power Co., Ltd. 2,761 1.88 % 55 55 55 DMC Co., Ltd. 5,831 0.02 % 38 38 38 Amanex Co., Ltd. 10 0.02 % 9 9 9 Dae-A Leisure Co., Ltd. 23 0.00 % 4 4 4 Caffe Bene Co.,Ltd. 1,908 0.03 % 2 2 2 Daechang HRSG Co.,Ltd. 618 0.12 % 62 62 62 Shinjin International Corp. 4 0.01 % 1 1 1 Daewoon Shell Tech Co., Ltd. 666 2.81 % 33 33 33 Jinhung Packaging Co.,Ltd 4,329 3.02 % 9 22 22 Donglim Eng Co., Ltd. 26 0.11 % 3 3 3 SIP Co., Ltd. 274 0.55 % 7 7 7 Clizen Co., Ltd. 615 0.34 % 31 31 31 DAEDONGMILLENNIUM Co., Ltd. 159 0.42 % 32 32 32 Daeji Product Co., Ltd. 15 0.05 % 1 — — Cheong Hae Myeong Ga Co.,Ltd 1,867 0.11 % 5 5 5 Shinhan Sangi Co., Ltd. 29 0.20 % 4 4 4 Jaein Circuit Co., Ltd. 498 1.12 % 65 65 65 SSET Co., Ltd. 181 0.30 % 18 18 18 Sewon PM Tech Co., Ltd. 963 1.11 % 48 48 48 Dawon Yuhwa Co., Ltd. 506 1.94 % 25 25 25 Ogokbaekkwa Co., Ltd. 101 0.12 % 1 1 1 Shinwonn Toptech Co., Ltd. 834 0.51 % 83 83 83 KMLC Co., Ltd. 281 0.14 % 22 22 22 Seinfood Co., Ltd. 13 0.17 % 7 7 7 TaeSung Eco-Tech. Co., Ltd. 1,368 4.55 % 34 34 34 Kukex Inc. 639 0.05 % 3 3 3 Youngshin Plu Co., Ltd. 104 0.12 % 5 5 5 Chang won Engineering Co., Ltd. 22 0.00 % 4 4 4 Samsung Silup Co., Ltd. 47 0.19 % 5 5 5 Samwon Bio Tech Co., Ltd. 390 0.25 % 6 6 6 IZU KOREA Co. Ltd. 48 0.00 % 2 2 2 Dongdo CNP Co., Ltd. 234 0.36 % 6 6 6 Hando Precision Co.,Ltd 38 0.26 % 4 4 4 Dae Bang Industry Co.,Ltd. 115 0.13 % 6 6 6 S.I.T. Co.,Ltd 2,213 0.44 % 22 22 22 2019 Shares Ownership Acquisition Book value Fair value In millions of won Taejin Hiech Co., Ltd. 78 0.26 % ￦ 3 3 3 Headone Co.,Ltd. 69 0.12 % 7 7 7 Enaindustry Co., Ltd. 201 0.09 % 141 141 141 TCT Co., Ltd. 3,277 0.55 % 82 82 82 E-Won Solutech Co., Ltd. 158 0.16 % 40 40 40 MJT Co., Ltd. 1,013 0.20 % 51 51 51 KPL Circuit Co., Ltd. 283 0.08 % 14 14 14 Road Solar Co., Ltd. 12 0.00 % — — — Sung Ae Co., Ltd. 190 0.80 % 10 10 10 Han Mi Flexible Co.,Ltd. 143 0.20 % 43 43 43 Samhwa Casting Co. Ltd. 200 0.00 % 100 100 100 Millennium PNT Co., Ltd. 227 0.37 % 6 6 6 GN Chem Co., Ltd. 40 0.07 % 1 1 1 GW Industry Co., Ltd. 505 0.07 % 51 51 51 TM Construction co. Ltd 4 0.00 % — — — Dae Myung Co., Ltd 114 0.08 % 3 3 3 Nanomicart Co., Ltd. 176 1.06 % 35 35 35 Young San Heavy Industries Co., Ltd. 74 0.11 % 7 7 7 Samchungwon Co., Ltd. 15 0.24 % 2 2 2 Wooyang Frozen Foods Co., Ltd. 66 0.82 % 27 27 27 Nanomic Co., Ltd. 94 0.63 % 38 38 38 Dong Hwan Co., Ltd. 25 0.02 % 1 1 1 266,717 177,968 177,968 ￦ 626,056 379,170 379,170 (*1) The Company used initial cost as their fair value because there was not enough information to determine fair value, and the range of the estimated fair value is wide. (*2) The Company has estimated the fair value of Set Holding by using the discounted cash flow method and has recognized the difference between its fair value and book value as gain or loss on valuation of financial assets at FVOCI in other comprehensive income or loss for the year ended December 31, 2019.

Financial Assets at Amortized C

Financial Assets at Amortized Cost	12 Months Ended
	Dec. 31, 2019
Financial Assets at Amortized Cost [Abstract]
Financial Assets at Amortized Cost	11. Financial Assets at Amortized Cost Financial assets at amortized cost as of December 31, 2018 and 2019 are as follows: 2018 Financial assets at amortized cost Government grants Allowance for doubtful accounts Others Book value In millions of won Government bonds ￦ 3,042 — — — 3,042 Others 11,000 — — — 11,000 ￦ 14,042 — — — 14,042 Current ￦ 11,956 — — — 11,956 Non-current 2,086 — — — 2,086 2019 Financial assets at amortized cost Government grants Allowance for doubtful accounts Others Book value In millions of won Government bonds ￦ 1,609 — — — 1,609 Others 12,000 — — — 12,000 ￦ 13,609 — — — 13,609 Current ￦ 12,302 — — — 12,302 Non-current 1,307 — — — 1,307

Derivatives

Derivatives	12 Months Ended
	Dec. 31, 2019
Derivatives [Abstract]
Derivatives	12. Derivatives (1) Derivatives as of December 31, 2018 and 2019 are as follows: 2018 2019 Current Non-current Current Non-current In millions of won Derivative assets Currency forward ￦ 2,128 12,606 21 43,931 Currency swap 39,979 43,436 27,597 229,258 Interest rate swap — 2,342 — 7,592 Others(*1) — 1,844 — 2,634 ￦ 42,107 60,228 27,618 283,415 Derivative liabilities Currency forward ￦ 1,956 — 7,081 — Currency swap 14,881 233,690 59,327 45,184 Interest rate swap 1,439 58,042 451 50,756 Others(*2,3) 2,155 — 6,205 956 ￦ 20,431 291,732 73,064 96,896 (*1) The Company had a put option to sell shares of DS POWER Co., Ltd. and the fair value of the option is recorded in ‘Others’ in the prior year. The Company sold their shares during the year ended December 31, 2019. As described in Note 16, the Company has a right to purchase the shares of KOSPO Youngnam Power Co., Ltd., a subsidiary of the Company, and the amount is the fair value of the stock option. (*2) The Company has an obligation to settle the convertible preferred stock to financial investors pursuant to the settlement contract with Samcheok Eco Materials Co., Ltd., and the fair value of the obligation is recorded in ‘Others’. (*3) The Company has granted stock option to Chester Solar IV SpA, a joint venture of the Company, and 4 other third party investors and recognized its fair value as other derivative liabilities. (2) Currency forward contracts which are not designated as hedging instruments as of December 31, 2019 are as follows: Contract date Maturity date Contract amounts Contract exchange rate (in won) Counterparty Pay Receive In millions of won and thousands of foreign currencies except contract exchange rate Hana Bank 2014.04.10 2021.07.12 ￦ 55,120 USD 52,000 ￦ 1,060.00 Hana Bank 2014.04.28 2021.07.12 50,784 USD 48,000 1,058.00 Bank of America 2014.04.29 2021.07.12 105,400 USD 100,000 1,054.00 Hana Bank 2014.05.09 2021.07.12 104,600 USD 100,000 1,046.00 Hana Bank 2017.12.22 2021.07.12 105,079 USD 100,000 1,050.79 Korea Development Bank 2017.12.27 2021.07.12 104,849 USD 100,000 1,048.49 Citibank 2019.12.30 2020.01.23 12,943 USD 11,167 1,159.10 Standard Chartered 2019.12.17 2020.01.02 73,871 EUR 56,800 1,300.57 Nonghyup Bank 2019.12.02 2020.01.03 9,436 USD 8,000 1,179.55 Mizuho Bank 2019.12.03 2020.01.06 9,482 USD 8,000 1,185.25 Hana Bank 2019.12.04 2020.01.07 8,350 USD 7,000 1,192.82 Kookmin Bank 2019.12.05 2020.01.09 11,895 USD 10,000 1,189.45 CCB 2019.12.05 2020.01.09 11,895 USD 10,000 1,189.50 Standard Chartered 2019.12.06 2020.01.10 11,891 USD 10,000 1,189.05 Credit Agricole 2019.12.09 2020.01.13 11,885 USD 10,000 1,188.47 Hana Bank 2019.12.10 2020.01.14 11,912 USD 10,000 1,191.23 Korea Development Bank 2019.12.11 2020.01.15 11,925 USD 10,000 1,192.50 Nonghyup Bank 2019.12.11 2020.01.15 5,962 USD 5,000 1,192.45 Mizuho Bank 2019.12.11 2020.01.15 5,963 USD 5,000 1,192.50 CCB 2019.12.12 2020.01.16 7,118 USD 6,000 1,186.35 Morgan Stanley 2019.12.16 2020.01.17 5,854 USD 5,000 1,170.85 Woori Bank 2019.12.19 2020.01.22 11,636 USD 10,000 1,163.55 Shinhan Bank 2019.12.19 2020.01.22 11,635 USD 10,000 1,163.45 CCB 2019.12.27 2020.01.31 11,597 USD 10,000 1,159.65 Kookmin Bank 2019.12.30 2020.02.03 5,786 USD 5,000 1,157.20 Shinhan Bank 2019.12.18 2020.01.07 9,901 USD 8,500 1,164.86 Hana Bank 2019.12.13 2020.01.07 4,678 USD 4,000 1,169.45 Hana Bank 2019.12.20 2020.01.07 8,136 USD 7,000 1,162.23 BNP Paribas 2019.12.27 2020.01.13 3,480 USD 3,000 1,160.10 Societe Generale 2019.12.27 2020.01.13 8,701 USD 7,500 1,160.10 Korea Development Bank 2019.12.30 2020.01.23 4,630 USD 4,000 1,157.40 BNP Paribas 2019.12.12 2020.01.16 ￦ 4,739 USD 4,000 ￦ 1,184.85 Mizuho Bank 2019.12.12 2020.01.16 3,558 USD 3,000 1,186.00 MUFG 2019.12.17 2020.01.21 5,823 USD 5,000 1,164.60 Nova Scotia 2019.12.17 2020.01.21 5,824 USD 5,000 1,164.70 BNP Paribas 2019.12.20 2020.01.22 2,290 USD 1,975 1,159.48 Nonghyup Bank 2019.12.20 2020.01.22 11,605 USD 10,000 1,160.50 Nova Scotia 2019.12.30 2020.02.03 5,778 USD 5,000 1,155.65 Mizuho Bank 2019.12.30 2020.02.03 5,777 USD 5,000 1,155.30 HSBC 2019.12.13 2020.09.10 46,580 USD 40,000 1,164.50 Nova Scotia 2019.12.13 2020.09.10 34,959 USD 30,000 1,165.30 Nova Scotia 2019.12.16 2020.12.03 11,657 USD 10,000 1,165.70 Nonghyup Bank 2019.12.16 2020.12.03 23,324 USD 20,000 1,166.20 Mizuho Bank 2019.12.17 2020.01.10 10,537 USD 9,000 1,170.80 Mizuho Bank 2019.12.19 2020.01.13 9,314 USD 8,000 1,164.30 Mizuho Bank 2019.12.24 2020.01.04 5,228 USD 4,500 1,161.85 HSBC 2019.12.26 2020.01.23 10,443 USD 9,000 1,160.30 Mizuho Bank 2019.12.30 2020.01.23 4,624 USD 4,000 1,155.90 Standard Chartered 2019.12.03 2020.01.06 315 USD 266 1,186.05 Nova Scotia 2019.12.06 2020.01.10 4,393 USD 3,700 1,187.35 Credit Agricole 2019.12.06 2020.01.10 4,761 USD 4,000 1,190.35 Nova Scotia 2019.12.10 2020.01.13 1,491 USD 1,250 1,192.70 Standard Chartered 2019.12.12 2020.01.16 8,303 USD 7,000 1,186.10 Credit Agricole 2019.12.12 2020.01.16 5,930 USD 5,000 1,185.95 Societe Generale 2019.12.12 2020.01.16 5,931 USD 5,000 1,186.20 Nova Scotia 2019.12.12 2020.01.16 6,525 USD 5,500 1,186.30 Standard Chartered 2019.12.16 2020.01.21 9,367 USD 8,000 1,170.90 Nova Scotia 2019.12.17 2020.01.21 4,648 USD 4,000 1,162.00 Hana Bank 2019.12.19 2020.01.23 6,055 USD 5,200 1,164.40 Woori Bank 2019.12.20 2020.01.28 9,414 USD 8,100 1,162.20 Shinhan Bank 2019.12.20 2020.01.28 4,939 USD 4,250 1,162.15 Shinhan Bank 2019.12.20 2020.01.28 5,806 USD 5,000 1,161.25 Shinhan Bank 2019.12.26 2020.01.30 7,539 USD 6,500 1,159.85 Woori Bank 2019.12.26 2020.01.30 4,060 USD 3,500 1,159.90 Shinhan Bank 2019.12.30 2020.02.03 4,049 USD 3,500 1,156.80 Hana Bank 2019.07.31 2020.07.14 4,993 USD 4,257 1,173.00 (3) Currency swap contracts which are not designated as hedging instruments as of December 31, 2019 are as follows: Counterparty Contract year Contract amount Contract interest rate Contract (in won, Pay Receive Pay Receive In millions of won and thousands of foreign currencies except contract exchange rate information Standard Chartered 2014~2029 ￦ 102,470 USD 100,000 3.14% 3.57% ￦ 1,024.70 Societe Generale 2014~2024 105,017 USD 100,000 4.92% 5.13% 1,050.17 Hana Bank 2015~2024 107,970 USD 100,000 4.75% 5.13% 1,079.70 Credit Agricole 2015~2024 94,219 USD 86,920 4.85% 5.13% 1,083.97 Woori Bank 2019~2027 21,708 USD 19,417 5.04% 6.75% 1,118.00 Woori Bank 2019~2024 296,000 USD 250,000 1.21% 2.50% 1,184.00 Korea Development Bank 2019~2024 177,600 USD 150,000 1.24% 2.50% 1,184.00 Hana Bank 2019~2024 118,400 USD 100,000 1.24% 2.50% 1,184.00 Citibank 2012~2022 112,930 USD 100,000 2.79% 3.00% 1,129.30 JP Morgan 2012~2022 112,930 USD 100,000 2.79% 3.00% 1,129.30 Bank of America 2012~2022 112,930 USD 100,000 2.79% 3.00% 1,129.30 Shinhan Bank 2016~2022 112,930 USD 100,000 2.79% 3.00% 1,129.30 HSBC 2012~2022 111,770 USD 100,000 2.89% 3.00% 1,117.70 Hana Bank 2012~2022 111,770 USD 100,000 2.87% 3.00% 1,117.70 Standard Chartered 2012~2022 111,770 USD 100,000 2.89% 3.00% 1,117.70 Deutsche Bank 2012~2022 55,885 USD 50,000 2.79% 3.00% 1,117.70 Nomura 2015~2025 111,190 USD 100,000 2.60% 3.25% 1,111.90 Korea Development Bank 2015~2025 111,190 USD 100,000 2.62% 3.25% 1,111.90 Woori Bank 2015~2025 55,595 USD 50,000 2.62% 3.25% 1,111.90 Hana Bank 2015~2025 55,595 USD 50,000 2.62% 3.25% 1,111.90 Woori Bank 2017~2027 111,610 USD 100,000 2.25% 3.13% 1,116.10 Korea Development Bank 2017~2027 111,610 USD 100,000 2.31% 3.13% 1,116.10 Hana Bank 2017~2027 111,610 USD 100,000 2.31% 3.13% 1,116.10 Korea Development Bank 2018~2028 108,600 HKD 800,000 2.69% 3.35% 135.75 Shinhan Bank 2018~2028 115,388 HKD 850,000 2.66% 3.35% 135.75 Korea Development Bank 2018~2023 170,280 USD 150,000 2.15% 3.75% 1,135.20 Woori Bank 2018~2023 170,280 USD 150,000 2.18% 3.75% 1,135.20 Hana Bank 2018~2023 113,520 USD 100,000 2.17% 3.75% 1,135.20 Shinhan Bank 2018~2023 227,040 USD 200,000 2.17% 3.75% 1,135.20 Citibank 2019~2024 239,956 CHF 200,000 1.44% 0.00% 1,199.78 Korea Development Bank 2019~2027 119,978 CHF 100,000 1.43% 0.05% 1,199.78 HSBC 2019~2024 USD 205,500 AUD 300,000 3M Libor+0.78% 3M BBSW+0.97% 0.69 (4) Currency swap contracts which are designated as hedging instruments as of December 31, 2019 are as follows: Counterparty Contract Contract amount Contract interest rate Contract (in won, Pay Receive Pay Receive In millions of won and thousands of foreign currencies except contract exchange rate information HSBC 2014~2020 ￦ 99,901 AUD 100,000 3.52% 5.75% ￦ 999.01 HSBC 2014~2020 100,482 AUD 100,000 3.48% 5.75% 1,004.82 Standard Chartered 2013~2020 USD 117,250 AUD 125,000 3M Libor + 1.25% 5.75% 0.94 Standard Chartered 2014~2020 126,032 USD 117,250 3.55% 3M Libor + 1.25% 1,074.90 Korea Development Bank 2017~2020 114,580 USD 100,000 1.75% 2.38% 1,145.80 Hana Bank 2017~2020 114,580 USD 100,000 1.75% 2.38% 1,145.80 Export-import bank of Korea 2017~2020 114,580 USD 100,000 1.75% 2.38% 1,145.80 Korea Development Bank 2016~2021 121,000 USD 100,000 2.15% 2.50% 1,210.00 Morgan Stanley 2016~2021 121,000 USD 100,000 3M Libor + 2.10% 2.50% 1,210.00 BNP Paribas 2016~2021 121,000 USD 100,000 3M Libor + 2.10% 2.50% 1,210.00 Nomura 2017~2037 52,457 EUR 40,000 2.60% 1.70% 1,311.42 Nomura 2017~2037 59,423 SEK 450,000 2.62% 2.36% 132.05 Korea Development Bank 2019~2022 112,650 USD 100,000 1.80% 3.38% 1,126.50 Kookmin Bank 2019~2022 112,650 USD 100,000 1.80% 3.38% 1,126.50 Woori Bank 2019~2022 112,650 USD 100,000 1.80% 3.38% 1,126.50 Korea Development Bank 2018~2023 320,880 USD 300,000 2.03% 3.75% 1,069.60 BNP Paribas 2019~2024 111,841 CHF 100,000 1.78% 0.13% 1,118.41 Kookmin Bank 2019~2024 111,841 CHF 100,000 1.78% 0.13% 1,118.41 Korea Development Bank 2019~2022 117,340 USD 100,000 1.06% 2.38% 1,173.40 Hana Bank 2019~2022 117,340 USD 100,000 1.06% 2.38% 1,173.40 Kookmin Bank 2019~2022 117,340 USD 100,000 1.06% 2.38% 1,173.40 Hana Bank 2018~2021 212,960 USD 200,000 2.10% 3.00% 1,064.80 Korea Development Bank 2018~2021 212,960 USD 200,000 2.10% 3.00% 1,064.80 Credit Agricole 2014~2020 110,680 USD 100,000 2.29% 2.50% 1,106.80 Societe Generale 2014~2020 55,340 USD 50,000 2.16% 2.50% 1,106.80 Hana Bank 2014~2020 55,340 USD 50,000 2.16% 2.50% 1,106.80 Hana Bank 2014~2020 55,340 USD 50,000 2.21% 2.50% 1,106.80 Standard Chartered 2014~2020 55,340 USD 50,000 2.21% 2.50% 1,106.80 HSBC 2014~2020 55,340 USD 50,000 2.21% 2.50% 1,106.80 Nomura 2014~2020 55,340 USD 50,000 2.21% 2.50% 1,106.80 BNP Paribas 2014~2020 55,340 USD 50,000 2.21% 2.50% 1,106.80 HSBC 2014~2020 55,340 USD 50,000 2.21% 2.50% 1,106.80 Hana Bank 2017~2022 226,600 USD 200,000 1.94% 2.63% 1,133.00 Korea Development Bank 2017~2022 113,300 USD 100,000 1.94% 2.63% 1,133.00 Nomura 2017~2022 113,300 USD 100,000 1.95% 2.63% 1,133.00 Woori Bank 2017~2022 56,650 USD 50,000 1.95% 2.63% 1,133.00 Kookmin Bank 2017~2022 56,650 USD 50,000 1.95% 2.63% 1,133.00 Korea Development Bank 2018~2023 ￦ 169,335 USD 150,000 2.26% 3.88% ￦ 1,128.90 Woori Bank 2018~2023 169,335 USD 150,000 2.26% 3.88% 1,128.90 Credit Agricole 2018~2023 112,890 USD 100,000 2.26% 3.88% 1,128.90 Hana Bank 2018~2023 56,445 USD 50,000 2.26% 3.88% 1,128.90 Kookmin Bank 2018~2023 56,445 USD 50,000 2.26% 3.88% 1,128.90 (5) Interest rate swap contracts which are not designated as hedging instruments as of December 31, 2019 are as follows: Counterparty Contract Contract amount Contract interest rate per annum Pay Receive In millions of Hana Bank 2017~2022 ￦ 100,000 2.01% 3M CD + 0.24% Hana Bank 2017~2022 100,000 2.06% 3M CD + 0.27% Nomura(*1) 2017~2037 30,000 2.05% 3.08% Hana Bank 2017~2021 200,000 2.45% 3M CD + 0.32% Nomura(*2) 2018~2038 30,000 2.56% 3.75% Hana Bank 2018~2023 200,000 2.15% 3M CD + 0.19% Hana Bank 2018~2023 200,000 2.17% 3M CD + 0.19% Hana Bank 2018~2023 150,000 2.03% 3M CD + 0.21% Hana Bank 2019~2024 200,000 1.87% 3M CD + 0.13% Societe Generale 2017~2022 200,000 3M Libor + 3.44% 3.77% Nomura 2017~2027 52,457 3M Libor + 2.25% 2.60% Nomura 2017~2027 59,423 3M Libor + 2.27% 2.62% Export-Import Bank of Korea 2015~2031 USD 15,893 2.67% 6M USD Libor ING Bank 2015~2031 USD 7,861 2.67% 6M USD Libor BNP Paribas 2015~2031 USD 7,861 2.67% 6M USD Libor (*1) 2.05% of the contract paying interest rate is applied for five years from the date of issuance, and 3M CD + 0.10% is applied thereafter. Depending on exercise of counterparty’s right, it can be reimbursed before the due on the same day of every year starting from September 18, 2022. (*2) 2.56% of the contract paying interest rate is applied for five years from the date of issuance, and 3M CD + 0.10% is applied thereafter. Depending on exercise of counterparty’s right, it can be reimbursed before the due on the same day of every year starting from June 15, 2023. (6) Interest rate swap contracts which are designated as hedging instruments as of December 31, 2019 are as follows: Counterparty Contract Contract amount Contract interest rate per annum Pay Receive In millions of BNP Paribas 2009~2027 USD 92,120 4.16% 6M USD Libor KFW 2009~2027 USD 92,120 4.16% 6M USD Libor Export-Import Bank of Korea 2016~2036 USD 80,514 3.00% 6M USD Libor (7) Gain and loss on valuation and transaction of derivatives for the years ended December 31, 2017, 2018 and 2019 are as follows and included in finance income and expenses in the consolidated statements of comprehensive income (loss): Net income effects of Net income effects of Other comprehensive 2017 2018 2019 2017 2018 2019 2017 2018 2019 In millions of won Currency forward ￦ (41,889 ) 12,632 24,265 (28,223 ) 23,991 12,488 — — — Currency swap (843,747 ) 145,088 310,732 (137,376 ) 123,670 110,813 26,810 (12,516 ) 38,802 Interest rate swap 6,909 (2,949 ) (16,231 ) (3,362 ) (364 ) (36,886 ) 5,074 6,087 (3,075 ) Other derivatives 4,060 (1,568 ) (1,416 ) — — — — — — ￦ (874,667 ) 153,203 317,350 (168,961 ) 147,297 86,415 31,884 (6,429 ) 35,727 (*) For the year ended December 31, 2019, the net gain on valuation of derivatives designated as cash flow hedge of ￦19,242 million, net of tax, is included in other comprehensive income or loss.

Other Financial Assets

Other Financial Assets	12 Months Ended
	Dec. 31, 2019
Other Financial Assets [Abstract]
Other Financial Assets	13. Other Financial Assets (1) Other financial assets as of December 31, 2018 and 2019 are as follows: 2018 2019 Current Non-current Current Non-current In millions of won Loans and receivables ￦ 123,657 639,673 64,111 725,755 Less: Allowance for doubtful accounts (12 ) (4,940 ) (31 ) (15,063 ) Less: Present value discount (992 ) (38,712 ) (847 ) (35,218 ) Long-term / short-term financial instruments(*) 1,869,286 448,741 1,351,971 608,256 ￦ 1,991,939 1,044,762 1,415,204 1,283,730 (*) From prior year, certain financial assets at fair value previously recognized as other financial assets is reclassified to financial assets at fair value through profit or loss upon the adoption of IFRS 9 ‘Financial Instruments’. (2) Loans and receivables as of December 31, 2018 and 2019 are as follows: 2018 Face value Allowance for Present value Carrying value In millions of won Short-term loans and receivables Loans for tuition ￦ 33,333 — (992 ) 32,341 Loans for housing 15,572 — — 15,572 Fisheries loan 320 — — 320 Other loans 74,432 (12 ) — 74,420 123,657 (12 ) (992 ) 122,653 Long-term loans and receivables Loans for tuition 414,893 — (38,659 ) 376,234 Loans for housing 167,723 — — 167,723 Loans for related parties 46,798 (4,930 ) — 41,868 Fisheries loan 640 — (53 ) 587 Other loans 9,619 (10 ) — 9,609 639,673 (4,940 ) (38,712 ) 596,021 ￦ 763,330 (4,952 ) (39,704 ) 718,674 2019 Face value Allowance for Present value Carrying value In millions of won Short-term loans and receivables Loans for tuition ￦ 33,636 — (847 ) 32,789 Loans for housing 17,113 — — 17,113 Other loans 13,362 (31 ) — 13,331 64,111 (31 ) (847 ) 63,233 Long-term loans and receivables Loans for tuition 419,905 — (35,197 ) 384,708 Loans for housing 199,454 — — 199,454 Loans for related parties 89,132 (4,930 ) — 84,202 Other loans 17,264 (10,133 ) (21 ) 7,110 725,755 (15,063 ) (35,218 ) 675,474 ￦ 789,866 (15,094 ) (36,065 ) 738,707 (3) Changes in the allowance for doubtful accounts of loans for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 2018 2019 In millions of won Beginning balance ￦ 4,532 8,948 4,952 Bad debt expense 2,465 22 10,142 Other 1,951 (4,018 ) — Ending balance ￦ 8,948 4,952 15,094 (4) Long-term and short-term financial instruments as of December 31, 2018 and 2019 are as follows: 2018 2019 Current Non-current Current Non-current In millions of won Time deposits ￦ 1,602,285 63,358 1,034,971 257,857 CP — — 40,000 — CD 10,000 — 15,000 — RP — — 40,000 — Others 257,001 385,383 222,000 350,399 ￦ 1,869,286 448,741 1,351,971 608,256

Inventories

Inventories	12 Months Ended
	Dec. 31, 2019
Inventories [Abstract]
Inventories	14. Inventories Inventories as of December 31, 2018 and 2019 are as follows: 2018 Acquisition cost Valuation allowance Book value In millions of won Raw materials ￦ 3,886,739 (2,609 ) 3,884,130 Work-in-progress 189,907 (1,028 ) 188,879 Finished goods 50,526 — 50,526 Supplies 1,858,751 (3,907 ) 1,854,844 Inventories-in-transit 1,196,113 — 1,196,113 Other inventories 13,761 — 13,761 ￦ 7,195,797 (7,544 ) 7,188,253 2019 Acquisition cost Valuation allowance Book value In millions of won Raw materials ￦ 3,790,443 (1,430 ) 3,789,013 Merchandises 340 — 340 Work-in-progress 165,073 — 165,073 Finished goods 58,280 — 58,280 Supplies 2,121,363 (4,369 ) 2,116,994 Inventories-in-transit 906,267 — 906,267 Other inventories 14,733 — 14,733 ￦ 7,056,499 (5,799 ) 7,050,700 The reversals of the allowance for loss on inventory valuation due to increase in the net realizable value of inventories deducted from cost of sales for the years ended December 31, 2017, 2018 and 2019 were ￦437 million , ￦3,723 million and ￦4,872 million, respectively. The amounts of loss from inventory valuation included in other gains or losses for the years ended December 31, 2017, 2018 and 2019 were ￦3,875 million, ￦1,953 million and ￦3,127 million, respectively.

Non-Financial Assets

Non-Financial Assets	12 Months Ended
	Dec. 31, 2019
Non-Financial Assets [Abstract]
Non-Financial Assets	15. Non-Financial Non-financial 2018 2019 Current Non-current Current Non-current In millions of won Advanced payment ￦ 156,073 160,628 147,784 2,694 Prepaid expenses(*1) 290,944 90,449 308,017 84,421 Others(*2) 431,871 76,075 750,576 79,814 ￦ 878,888 327,152 1,206,377 166,929 (*1) Prepaid expenses of ￦4,353 million as of December 31, 2018 was recorded as right-of-assets (*2) Details of others as of December 31, 2018 and 2019 are as follows: 2018 2019 Current Non-current Current Non-current In millions of won Greenhouse gas emissions rights ￦ 93,749 — 437,562 — Other quick assets, etc.(*3) 338,122 76,075 313,014 79,814 ￦ 431,871 76,075 750,576 79,814 (*3) The Company recognized ￦92,128 million of its rights in connection with the securities of Orano Expansion as non-current non-financial

Consolidated Subsidiaries

Consolidated Subsidiaries	12 Months Ended
	Dec. 31, 2019
Consolidated Subsidiaries [Abstract]
Consolidated Subsidiaries	16. Consolidated Subsidiaries (1) Consolidated subsidiaries as of December 31, 2018 and 2019 are as follows: Percentage of ownership (%) Subsidiaries Key operation activities Location 2018 2019 Korea Hydro & Nuclear Power Co., Ltd. Power generation KOREA 100.00 % 100.00 % Korea South-East Power Co., Ltd. Power generation KOREA 100.00 % 100.00 % Korea Midland Power Co., Ltd. Power generation KOREA 100.00 % 100.00 % Korea Western Power Co., Ltd. Power generation KOREA 100.00 % 100.00 % Korea Southern Power Co., Ltd. Power generation KOREA 100.00 % 100.00 % Korea East-West Power Co., Ltd. Power generation KOREA 100.00 % 100.00 % KEPCO Engineering & Construction Company, Inc.(*1) Architectural engineering for utility plant and others KOREA 65.77 % 65.77 % KEPCO Plant Service & Engineering Co., Ltd. Utility plant maintenance and others KOREA 51.00 % 51.00 % KEPCO Nuclear Fuel Co., Ltd. Nuclear fuel KOREA 96.36 % 96.36 % KEPCO KDN Co., Ltd. Electric power information technology and others KOREA 100.00 % 100.00 % Garolim Tidal Power Plant Co., Ltd.(*6) Power generation KOREA 49.00 % — KEPCO International HongKong Ltd. Holding company HONG KONG 100.00 % 100.00 % KEPCO International Philippines Inc. Holding company PHILIPPINES 100.00 % 100.00 % KEPCO Gansu International Ltd. Holding company HONG KONG 100.00 % 100.00 % KEPCO Philippines Holdings Inc. Holding company PHILIPPINES 100.00 % 100.00 % KEPCO Philippines Corporation Operation of utility plant PHILIPPINES 100.00 % 100.00 % KEPCO Ilijan Corporation Construction and operation of utility plant PHILIPPINES 51.00 % 51.00 % KEPCO Lebanon SARL Operation of utility plant LEBANON 100.00 % 100.00 % KEPCO Neimenggu International Ltd. Holding company HONG KONG 100.00 % 100.00 % KEPCO Shanxi International Ltd. Holding company HONG KONG 100.00 % 100.00 % KOMIPO Global Pte Ltd. Holding company SINGAPORE 100.00 % 100.00 % KEPCO Netherlands B.V. Holding company NETHERLANDS 100.00 % 100.00 % KOREA Imouraren Uranium Investment Corp. Holding company FRANCE 100.00 % 100.00 % KEPCO Australia Pty., Ltd. Resources development AUSTRALIA 100.00 % 100.00 % KOSEP Australia Pty., Ltd. Resources development AUSTRALIA 100.00 % 100.00 % KOMIPO Australia Pty., Ltd. Resources development AUSTRALIA 100.00 % 100.00 % KOWEPO Australia Pty., Ltd. Resources development AUSTRALIA 100.00 % 100.00 % KOSPO Australia Pty., Ltd. Resources development AUSTRALIA 100.00 % 100.00 % KEPCO Middle East Holding Company Holding company BAHRAIN 100.00 % 100.00 % Qatrana Electric Power Company Construction and operation of utility plant JORDAN 80.00 % 80.00 % KHNP Canada Energy, Ltd. Holding company CANADA 100.00 % 100.00 % KEPCO Bylong Australia Pty., Ltd. Resources development AUSTRALIA 100.00 % 100.00 % Korea Waterbury Uranium Limited Partnership Resources development CANADA 80.00 % 80.00 % Korea Electric Power Nigeria Ltd.(*7) Operation of utility plant NIGERIA 100.00 % — KEPCO Holdings de Mexico Holding company MEXICO 100.00 % 100.00 % KST Electric Power Company Construction and operation of utility plant MEXICO 56.00 % 56.00 % KEPCO Energy Service Company Operation of utility plant MEXICO 100.00 % 100.00 % KEPCO Netherlands S3 B.V. Holding company NETHERLANDS 100.00 % 100.00 % PT. KOMIPO Pembangkitan Jawa Bali Operation of utility plant INDONESIA 51.00 % 51.00 % PT. Cirebon Power Service(*2) Operation of utility plant INDONESIA 27.50 % 27.50 % KOWEPO International Corporation Operation of utility plant PHILIPPINES 99.99 % 99.99 % KOSPO Jordan, LLC Operation of utility plant JORDAN 100.00 % 100.00 % EWP Philippines Corporation Holding company PHILIPPINES 100.00 % 100.00 % EWP America Inc. Holding company USA 100.00 % 100.00 % EWP Renewable Corporation Holding company USA 100.00 % 100.00 % DG Fairhaven Power, LLC Power generation USA 100.00 % 100.00 % DG Whitefield, LLC Power generation USA 100.00 % 100.00 % Springfield Power, LLC Power generation USA 100.00 % 100.00 % KNF Canada Energy Limited Holding company CANADA 100.00 % 100.00 % EWP Barbados 1 SRL Holding company BARBADOS 100.00 % 100.00 % California Power Holdings, LLC Power generation USA 100.00 % 100.00 % Gyeonggi Green Energy Co., Ltd. Power generation KOREA 62.01 % 62.01 % PT. Tanggamus Electric Power Power generation INDONESIA 52.50 % 52.50 % Gyeongju Wind Power Co., Ltd. Power generation KOREA 70.00 % 70.00 % KOMIPO America Inc. Holding company USA 100.00 % 100.00 % EWPRC Biomass Holdings, LLC Holding company USA 100.00 % 100.00 % KOSEP USA, INC. Power generation USA 100.00 % 100.00 % PT. EWP Indonesia Holding company INDONESIA 99.96 % 99.96 % KEPCO Netherlands J3 B.V. Holding company NETHERLANDS 100.00 % 100.00 % Korea Offshore Wind Power Co., Ltd. Power generation KOREA 100.00 % 100.00 % Global One Pioneer B.V. Holding company NETHERLANDS 100.00 % 100.00 % Global Energy Pioneer B.V. Holding company NETHERLANDS 100.00 % 100.00 % Mira Power Limited(*3) Power generation PAKISTAN 76.00 % 76.00 % KOSEP Material Co., Ltd. Recycling fly ashes KOREA 86.22 % 86.22 % Commerce and Industry Energy Co., Ltd.(*4) Power generation KOREA 59.03 % 85.00 % KEPCO Singapore Holdings Pte., Ltd.(*7) Holding company SINGAPORE 100.00 % — KEPCO KPS Philippines Corp. Utility plant maintenance and others PHILIPPINES 99.99 % 99.99 % KOSPO Chile SpA Holding company CHILE 100.00 % 100.00 % PT. KOWEPO Sumsel Operation And Maintenance Services Utility plant maintenance and others INDONESIA 95.00 % 95.00 % HeeMang Sunlight Power Co., Ltd. Operation of utility plant KOREA 100.00 % 100.00 % Fujeij Wind Power Company Operation of utility plant JORDAN 100.00 % 100.00 % KOSPO Youngnam Power Co., Ltd. Operation of utility plant KOREA 50.00 % 50.00 % VI Carbon Professional Private Special Asset Investment Trust 1 Holding company KOREA 96.67 % 96.67 % Chitose Solar Power Plant LLC Power generation JAPAN 80.10 % 80.10 % KEPCO Energy Solution Co. Ltd. Energy service KOREA 100.00 % 100.00 % Solar School Plant Co., Ltd. Power generation KOREA 100.00 % 100.00 % KOSPO Power Services Limitada Utility plant maintenance and others CHILE 65.00 % 65.00 % Energy New Industry Specialized Investment Private Investment Trust Holding company KOREA 99.01 % 99.01 % KOEN Bylong Pty., Ltd. Resources development AUSTRALIA 100.00 % 100.00 % KOMIPO Bylong Pty., Ltd. Resources development AUSTRALIA 100.00 % 100.00 % KOWEPO Bylong Pty., Ltd. Resources development AUSTRALIA 100.00 % 100.00 % KOSPO Bylong Pty., Ltd. Resources development AUSTRALIA 100.00 % 100.00 % EWP Bylong Pty., Ltd. Resources development AUSTRALIA 100.00 % 100.00 % KOWEPO Lao International Utility plant maintenance and others LAOS 100.00 % 100.00 % KEPCO US Inc. Holding company USA 100.00 % 100.00 % KEPCO Alamosa LLC Holding company USA 50.10 % 50.10 % KEPCO Solar of Alamosa, LLC (formerly, Cogentrix of Alamosa, LLC) Power generation USA 100.00 % 100.00 % KEPCO-LG Holding company USA 70.00 % 70.00 % Mangilao Investment LLC Holding company USA 100.00 % 100.00 % KEPCO-LG Power generation USA 100.00 % 100.00 % Jeju Hanlim Offshore Wind Co., Ltd. Power generation KOREA 75.99 % 75.99 % PT. Siborpa Eco Power Construction and operation of utility plant INDONESIA 55.00 % 55.00 % BSK E-New Holding company KOREA 81.67 % 81.67 % e-New Holding company KOREA 76.11 % 76.11 % Songhyun e-New Holding company KOREA 80.65 % 80.65 % PT. Korea Energy Indonesia Utility plant maintenance and others INDONESIA 95.00 % 95.00 % KOLAT SpA Utility plant maintenance and others CHILE 100.00 % 100.00 % KEPCO California, LLC Holding company USA 100.00 % 100.00 % KEPCO Mojave Holdings, LLC Holding company USA 100.00 % 100.00 % Incheon Fuel Cell Co., Ltd. Power generation KOREA 60.00 % 60.00 % KOEN Service Co., Ltd. Facility maintenance and service KOREA 100.00 % 100.00 % KOMIPO Service Co., Ltd. Facility maintenance and service KOREA 100.00 % 100.00 % KOWEPO Service Co., Ltd. Facility maintenance and service KOREA 100.00 % 100.00 % KOSPO Service Co., Ltd. Facility maintenance and service KOREA 100.00 % 100.00 % EWP Service Co., Ltd. Facility maintenance and service KOREA 100.00 % 100.00 % PT. KOMIPO Energy Indonesia Utility plant maintenance and others INDONESIA 95.00 % 95.00 % KNF Partners Co., Ltd. Facility maintenance KOREA — 100.00 % KOSPO USA Inc. Holding company USA — 100.00 % Nambu USA LLC Holding company USA — 100.00 % Tamra Offshore Wind Power Co., Ltd.(*5) Power generation KOREA — 63.00 % KEPCO MCS Co., Ltd. Electric meter reading and others KOREA — 100.00 % KEPCO FMS Co., Ltd. Security service and others KOREA — 100.00 % Firstkeepers Co., Ltd. Facility maintenance KOREA — 100.00 % Secutec Co., Ltd. Security service KOREA — 100.00 % SE Green Energy Co., Ltd.(*5) Power generation KOREA — 84.80 % KEPCO Mangilao America LLC Holding company USA — 100.00 % Mangilao Intermediate Holdings LLC Holding company USA — 100.00 % KEPCO CSC Co., Ltd. Facility maintenance KOREA — 100.00 % KOAK Power Limited Facility maintenance PAKISTAN — 100.00 % KOMIPO Europe B.V. Holding company SWEDEN — 100.00 % Haenanum Energy Fund Holding company KOREA — 99.64 % Paju Ecoenergy Co., Ltd. Power generation KOREA — 89.00 % (*1) Considering treasury stocks, the effective percentage of ownership is 66.08%. (*2) The effective percentage of ownership is less than 50%. However, this subsidiary is included in the consolidated financial statements as the Company obtained the majority of the voting power through the shareholders’ agreement. (*3) As of the reporting date, the annual reporting period of all subsidiaries is December 31, except for Mira Power Limited which is November 30. (*4) The Company guarantees a certain return on investment related to Commerce and Industry Energy Co., Ltd. for the financial investors. The financial investors have a right to sell their shares to the Company which can be exercised 84 months after the date of investment. Accordingly, the purchase price including the return on investment is classified as a liability. (*5) The entity was reclassified from an associate to a subsidiary due to additional acquisition of interest during the year ended December 31, 2019. (*6) The liquidation process is in progress by the appointment of a liquidator, and the Company has been reclassified the invested amount as assets held for sale as of December 31, 2019. (*7) The liquidation process has been completed during the year ended December 31, 2019. (*8) The Company does not hold a stake, but it is included in subsidiaries because the Company has control over KEPCO-LG (2) Subsidiaries newly included in or excluded from consolidation for the year ended December 31, 2019 are as follows: Subsidiaries included in consolidation during the year ended December 31, 2019. Subsidiary Reason KNF Partners Co., Ltd. Newly established KOSPO USA Inc. Newly established Nambu USA LLC Newly established Tamra Offshore Wind Power Co., Ltd. Additional acquisition KEPCO MCS Co., Ltd. Newly established KEPCO FMS Co., Ltd. Newly established Firstkeepers Co., Ltd. Newly established Secutec Co., Ltd. Newly established SE Green Energy Co., Ltd. Additional acquisition KEPCO Mangilao America LLC Newly established Mangilao Intermediate Holdings LLC Newly established KEPCO CSC Co., Ltd. Newly established KOAK Power Limited Newly established KOMIPO Europe B.V. Newly established Haenanum Energy Fund Newly established Paju Ecoenergy Co., Ltd. Newly established Subsidiaries excluded from consolidation during the year ended December 31, 2019. Subsidiary Reason KEPCO Singapore Holdings Pte., Ltd. Liquidated Korea Electric Power Nigeria Ltd. Liquidated Garolim Tidal Power Plant Co., Ltd. Under liquidation process (3) Summary of financial information of consolidated subsidiaries as of and for the years ended December 31, 2018 and 2019 are as follows: 2018 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the year In millions of won Korea Hydro & Nuclear Power Co., Ltd. ￦ 55,792,704 30,484,104 8,858,717 (137,613 ) Korea South-East Power Co., Ltd. 9,997,758 4,948,553 5,521,038 25,736 Korea Midland Power Co., Ltd. 10,839,218 7,088,013 4,368,467 (38,142 ) Korea Western Power Co., Ltd. 9,902,752 5,965,410 4,841,261 (28,157 ) Korea Southern Power Co., Ltd. 9,810,985 5,463,721 5,539,793 55,439 Korea East-West Power Co., Ltd. 8,744,380 4,092,460 4,933,525 3,345 KEPCO Engineering & Construction Company, Inc. 771,480 310,100 433,701 12,937 KEPCO Plant Service & Engineering Co., Ltd. 1,275,365 296,428 1,239,604 160,791 KEPCO Nuclear Fuel Co., Ltd. 817,416 434,439 230,667 15,835 KEPCO KDN Co., Ltd. 566,807 159,423 622,154 60,016 2018 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the year In millions of won Garolim Tidal Power Plant Co., Ltd. ￦ 608 345 — (11 ) KEPCO International HongKong Ltd. 140,101 1 — 3,307 KEPCO International Philippines Inc. 107,948 1,475 — 52,539 KEPCO Gansu International Ltd. 12,047 515 — (24 ) KEPCO Philippines Holdings Inc. 188,551 9,775 — 53,219 KEPCO Philippines Corporation 6,394 213 — 54 KEPCO Ilijan Corporation 431,444 53,413 99,844 49,631 KEPCO Lebanon SARL 1,509 9,686 — 413 KEPCO Neimenggu International Ltd. 194,336 — — 20,829 KEPCO Shanxi International Ltd. 519,991 201,732 — 290 KOMIPO Global Pte Ltd. 250,456 961 — 11,478 KEPCO Netherlands B.V. 130,460 77 — 26,550 KOREA Imouraren Uranium Investment Corp. 63,517 171 — (89,852 ) KEPCO Australia Pty., Ltd. 439,719 14 — 49 KOSEP Australia Pty., Ltd. 37,057 2,832 20,294 7,315 KOMIPO Australia Pty., Ltd. 39,066 4,659 20,294 7,193 KOWEPO Australia Pty., Ltd. 39,341 4,702 20,294 7,316 KOSPO Australia Pty., Ltd. 36,525 3,585 20,294 9,520 KEPCO Middle East Holding Company 101,201 92,862 — 3,043 Qatrana Electric Power Company 484,383 326,486 18,766 21,170 KHNP Canada Energy, Ltd. 49,776 35 — (26 ) KEPCO Bylong Australia Pty., Ltd. 254,398 315,921 — (29,573 ) Korea Waterbury Uranium Limited Partnership 20,890 142 — (74 ) Korea Electric Power Nigeria Ltd. 112 39 727 (93 ) KEPCO Holdings de Mexico 248 57 — (11 ) KST Electric Power Company 535,807 457,867 109,735 10,274 KEPCO Energy Service Company 1,940 1,454 5,117 (232 ) KEPCO Netherlands S3 B.V. 46,518 38 — 1,226 PT. KOMIPO Pembangkitan Jawa Bali 11,405 5,472 20,320 3,925 PT. Cirebon Power Service 1,588 273 7,228 177 KOWEPO International Corporation — 8 — — KOSPO Jordan LLC 16,315 3,432 34,371 1,907 EWP Philippines Corporation 1,684 829 — (11 ) EWP America Inc.(*1) 72,525 4,903 29,557 (4,483 ) KNF Canada Energy Limited 1,801 20 — (45 ) EWP Barbados 1 SRL 268,033 1,581 688 11,221 Gyeonggi Green Energy Co., Ltd. 293,812 185,043 96,442 25,121 PT. Tanggamus Electric Power 216,321 187,502 26,832 9,338 Gyeongju Wind Power Co., Ltd. 122,303 83,348 21,906 8,803 2018 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the year In millions of won KOMIPO America Inc. ￦ 10,092 572 — (885 ) KOSEP USA, Inc. 1 4,857 — 4,341 PT. EWP Indonesia 7,444 14 — 3,138 KEPCO Netherlands J3 B.V. 115,978 77 — (104 ) Korea Offshore Wind Power Co., Ltd. 216,114 36,377 — (8,473 ) Global One Pioneer B.V. 162 87 — (113 ) Global Energy Pioneer B.V. 325 74 — (102 ) Mira Power Limited 277,525 213,104 — (980 ) KOSEP Material Co., Ltd. 2,862 1,249 3,240 377 Commerce and Industry Energy Co., Ltd. 92,872 88,009 27,937 (6,091 ) KEPCO Singapore Holdings Pte., Ltd. 582 9 — (31 ) KEPCO KPS Philippines Corp. 7,501 358 4,815 766 KOSPO Chile SpA 139,814 57,502 — 1,016 PT. KOWEPO Sumsel Operation And Maintenance Services 1,313 394 4,343 (654 ) HeeMang Sunlight Power Co., Ltd. 10,915 7,626 146 (192 ) Fujeij Wind Power Company 217,796 212,435 — (1,033 ) KOSPO Youngnam Power Co., Ltd. 413,472 325,589 369,669 8,155 VI Carbon Professional Private Special Asset Investment Trust 1 (formally, HI Carbon Professional Private Special Asset) 3,002 — — 12 Chitose Solar Power Plant LLC 115,505 105,079 15,022 872 KEPCO Energy Solution Co., Ltd. 304,103 849 5,584 2,532 Solar School Plant Co., Ltd. 204,282 1,366 1,149 2,033 KOSPO Power Services Limitada 3,045 596 9,610 1,132 Energy New Industry Specialized Investment Private Investment Trust(*2) 66,498 1,014 — (1,140 ) KOEN Bylong Pty., Ltd. 5,544 26 — (10 ) KOMIPO Bylong Pty., Ltd. 5,544 26 — (25 ) KOWEPO Bylong Pty., Ltd. 5,544 26 — — KOSPO Bylong Pty., Ltd. 5,544 26 — (25 ) EWP Bylong Pty., Ltd. 5,544 16 — (15 ) KOWEPO Lao International 3,800 1,015 2,899 895 KEPCO US Inc. 16,640 — — 6 KEPCO Alamosa LLC 32,346 79 750 (688 ) KEPCO Solar of Alamosa, LLC (formerly, Cogentrix of Alamosa, LLC) 64,223 48,819 9,015 200 KEPCO-LG 25,642 27,197 — (1,144 ) Mangilao Investment LLC 25,641 — — — KEPCO-LG 25,406 146 — (104 ) 2018 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the year In millions of won Jeju Hanlim Offshore Wind Co., Ltd. ￦ 16,557 328 — (925 ) PT. Siborpa Eco Power 12,363 141 — (1,771 ) PT. Korea Energy Indonesia 1,183 60 1,459 223 KOLAT SpA 38,362 474 585 (186 ) KEPCO California, LLC 42,171 21 — (332 ) KEPCO Mojave Holdings, LLC 103,189 65,730 — (3,959 ) Incheon Fuel Cell Co., Ltd. 23,626 415 — (201 ) KOEN Service Co., Ltd. 583 31 — (48 ) KOMIPO Service Co., Ltd. 576 17 — (41 ) KOWEPO Service Co., Ltd. 750 227 — (77 ) KOSPO Service Co., Ltd. 576 6 — (30 ) EWP Service Co., Ltd. 667 97 — (30 ) PT. KOMIPO Energy Indonesia 2,236 — — — (*1) Financial information of EWP America Inc. includes that of six other subsidiaries, EWP Renewable Corporation, DG Fairhaven Power, LLC, DG Whitefield, LLC, Springfield Power, LLC, California Power Holdings, LLC, and EWPRC Biomass Holdings, LLC. (*2) Financial information of Energy New Industry Specialized Investment Private Investment Trust includes that of three other subsidiaries, BSK E-New e-New e-New 2019 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the year In millions of won Korea Hydro & Nuclear Power Co., Ltd. ￦ 59,570,219 33,917,275 8,969,072 306,007 Korea South-East Power Co., Ltd. 10,938,358 5,866,642 5,385,387 41,006 Korea Midland Power Co., Ltd. 12,684,828 8,977,766 4,479,707 (28,449 ) Korea Western Power Co., Ltd. 10,514,438 6,637,451 4,448,992 (46,061 ) Korea Southern Power Co., Ltd. 10,884,799 6,608,301 5,084,907 (41,342 ) Korea East-West Power Co., Ltd. 9,724,311 5,022,921 4,855,964 56,698 KEPCO Engineering & Construction Company, Inc. 735,207 242,994 448,635 26,398 KEPCO Plant Service & Engineering Co., Ltd. 1,356,983 294,757 1,244,613 157,737 KEPCO Nuclear Fuel Co., Ltd. 831,604 429,799 309,055 24,618 KEPCO KDN Co., Ltd. 604,458 159,807 625,567 42,205 KEPCO International HongKong Ltd. 138,942 633 — 3,330 KEPCO International Philippines Inc. 107,224 371 — 67,991 KEPCO Gansu International Ltd. 10,448 545 — (20 ) KEPCO Philippines Holdings Inc. 200,503 6,656 — 66,200 KEPCO Philippines Corporation 6,706 332 — (52 ) KEPCO Ilijan Corporation 371,377 56,156 95,072 40,818 KEPCO Lebanon SARL ￦ 1,835 9,786 — 255 KEPCO Neimenggu International Ltd. 200,858 — — (354 ) KEPCO Shanxi International Ltd. 538,604 208,895 — 151 KOMIPO Global Pte Ltd. 269,302 463 — 10,400 KEPCO Netherlands B.V. 122,577 101 — 948 KOREA Imouraren Uranium Investment Corp. 14,173 111 — (49,716 ) KEPCO Australia Pty., Ltd. 364 14 — (395,914 ) KOSEP Australia Pty., Ltd. 32,782 2,911 15,514 3,935 KOMIPO Australia Pty., Ltd. 40,898 2,909 15,514 3,766 KOWEPO Australia Pty., Ltd. 44,182 5,772 15,514 2,761 KOSPO Australia Pty., Ltd. 37,254 5,012 15,514 2,638 KEPCO Middle East Holding Company 102,164 87,834 — 5,934 Qatrana Electric Power Company 490,723 322,857 20,773 21,807 KHNP Canada Energy, Ltd. 44,639 43 — (10 ) KEPCO Bylong Australia Pty., Ltd. 45,207 355,163 — (220,909 ) Korea Waterbury Uranium Limited Partnership 20,717 167 — (77 ) KEPCO Holdings de Mexico 187 25 — (14 ) KST Electric Power Company 539,952 449,459 55,783 (20,797 ) KEPCO Energy Service Company 2,262 1,995 5,984 (481 ) KEPCO Netherlands S3 B.V. 50,352 49 — 2,637 PT. KOMIPO Pembangkitan Jawa Bali 12,391 5,719 18,722 4,312 PT. Cirebon Power Service 2,089 313 8,049 406 KOWEPO International Corporation — 10 — (2 ) KOSPO Jordan, LLC 17,489 1,521 10,878 2,634 EWP Philippines Corporation 1,691 888 — (111 ) EWP America Inc.(*1) 66,622 2,619 21,719 (6,497 ) KNF Canada Energy Limited 1,933 24 — (48 ) EWP Barbados 1 SRL 279,295 1,031 2,914 2,368 Gyeonggi Green Energy Co., Ltd. 194,425 159,078 13,717 (73,394 ) PT. Tanggamus Electric Power 228,601 195,826 2,256 (4,529 ) Gyeongju Wind Power Co., Ltd. 113,745 75,427 15,548 3,384 KOMIPO America Inc. 9,424 593 118 (1,033 ) KOSEP USA, Inc. 1 5,147 — (119 ) PT. EWP Indonesia 34,455 5 — 5,124 KEPCO Netherlands J3 B.V. 120,006 74 — (79 ) Korea Offshore Wind Power Co., Ltd. 284,495 117,527 — (12,768 ) Global One Pioneer B.V. 180 73 — (86 ) Global Energy Pioneer B.V. 348 80 — (90 ) Mira Power Limited 356,111 285,577 — (971 ) KOSEP Material Co., Ltd. 2,788 1,186 3,357 22 Commerce and Industry Energy Co., Ltd. 90,637 43,985 32,728 (7,532 ) KEPCO KPS Philippines Corp. 5,198 1,341 6,246 2 KOSPO Chile SpA ￦ 134,827 49,183 — (456 ) PT. KOWEPO Sumsel Operation And Maintenance Services 135 262 — (1,104 ) HeeMang Sunlight Power Co., Ltd. 12,185 8,545 643 75 Fujeij Wind Power Company 218,333 196,964 — 5,515 KOSPO Youngnam Power Co., Ltd. 398,495 307,226 318,338 3,514 VI Carbon Professional Private Special Asset Investment Trust 1 3,002 — — 12 Chitose Solar Power Plant LLC 121,457 106,254 17,103 5,480 KEPCO Energy Solution Co., Ltd. 308,188 2,142 2,843 2,805 Solar School Plant Co., Ltd. 208,730 3,269 1,962 2,553 KOSPO Power Services Limitada 3,244 1,564 10,013 452 Energy New Industry Specialized Investment Private Investment Trust(*2) 100,116 17,359 2,418 (7,735 ) KOEN Bylong Pty., Ltd. — 39 — (14 ) KOMIPO Bylong Pty., Ltd. 4 43 — (14 ) KOWEPO Bylong Pty., Ltd. 4 40 — (12 ) KOSPO Bylong Pty., Ltd. 4 40 — (12 ) EWP Bylong Pty., Ltd. 4 40 — (12 ) KOWEPO Lao International 5,430 575 4,308 1,584 KEPCO US Inc. 17,231 — — — KEPCO Alamosa LLC 33,515 183 145 (311 ) KEPCO Solar of Alamosa, LLC (formerly, Cogentrix of Alamosa, LLC) 65,468 50,348 8,739 (1,902 ) KEPCO-LG 27,439 30,287 — (1,240 ) Mangilao Investment LLC 39,972 — — — KEPCO-LG 39,373 11 — (524 ) Jeju Hanlim Offshore Wind Co., Ltd. 14,328 558 — (2,459 ) PT. Siborpa Eco Power 11,574 71 — (1,165 ) PT. Korea Energy Indonesia 1,592 121 2,462 323 KOLAT SpA 31,178 167 656 (296 ) KEPCO California, LLC 44,074 936 358 (513 ) KEPCO Mojave Holdings, LLC 103,815 69,544 — (4,215 ) Incheon Fuel Cell Co., Ltd. 22,669 475 — (1,010 ) KOEN Service Co., Ltd. 5,347 4,252 25,890 543 KOMIPO Service Co., Ltd. 3,327 2,622 24,556 146 KOWEPO Service Co., Ltd. 4,228 3,302 23,982 389 KOSPO Service Co., Ltd. 3,493 2,788 18,741 135 EWP Service Co., Ltd. 4,786 4,064 20,837 162 PT. KOMIPO Energy Indonesia 2,647 196 1,392 79 KNF partners Co., Ltd. 1,378 890 3,383 187 KOSPO USA Inc. 5,896 127 — (1,408 ) Nambu USA LLC ￦ 245 1 — 245 Tamra Offshore Wind Power Co., Ltd. 156,708 121,724 19,670 1,154 KEPCO MCS Co., Ltd. 26,510 22,151 129,393 3,408 KEPCO FMS Co., Ltd. 11,336 10,638 37,627 198 Firstkeepers Co., Ltd. 1,552 2,800 121 (2,239 ) Secutec Co., Ltd. 322 229 — (597 ) SE Green Energy Co., Ltd. 132,727 105,619 — 816 KEPCO Mangilao America LLC — — — — Mangilao Intermediate Holdings LLC 13,220 12,774 — (66 ) KEPCO CSC Co., Ltd. 837 51 — (14 ) KOAK Power Limited 15,930 — — — KOMIPO Europe B.V. 7,362 — — (286 ) Haenanum Energy Fund 28,101 1 — 1 Paju Ecoenergy Co., Ltd. 53,839 — — — (*1) Financial information of EWP America Inc. includes that of six other subsidiaries, EWP Renewable Corporation, DG Fairhaven Power, LLC, DG Whitefield, LLC, Springfield Power, LLC, California Power Holdings, LLC, and EWPRC Biomass Holdings, LLC. (*2) Financial information of Energy New Industry Specialized Investment Private Investment Trust includes that of three other subsidiaries, BSK E-New e-New e-New (4) Significant restrictions on abilities to subsidiaries are as follows: Company Nature and extent of any significant restrictions Gyeonggi Green Energy Co., Ltd. Acquisition or disposal of assets of more than ￦35 billion, change in the capacity of cogeneration units (except for the change due to performance improvement of equipment, maintenance) will require unanimous consent of all directors of the company. KOSPO Youngnam Power Co., Ltd. Dividends can only be paid when all conditions of the loan agreement are satisfied, or prior written consent of financial institutions is obtained. Company’s shares cannot be wholly or partially transferred without prior written consent of financial institutions. Incheon Fuel Cell Co., Ltd. Acquisition or disposal of assets of more than ￦20 billion, change in the capacity of cogeneration units (except for the change due to performance improvement of equipment, maintenance) will require unanimous consent of all directors of the company. (5) As of December 31, 2019, the Company has following entitlements in relation to its subsidiaries as per its shareholder’s agreements: Company Nature and extent of any significant restrictions KOSPO Youngnam Power Co., Ltd. The Company holds the right to purchase all shares held by the financial investors of KOSPO Youngnam Power Co., Ltd., a subsidiary of the Company, at face value of the issued shares on the 7th and 12th years from the Company’s establishment date. (6) Details of non-controlling 2017 Description KEPCO Ilijan KEPCO Plant KEPCO Construction Others Total In millions of won Percentage of ownership 49.00 % 49.00 % 33.92 % Current assets ￦ 160,588 623,934 257,529 1,269,175 2,311,226 Non-current 314,036 571,152 504,637 2,588,833 3,978,658 Current liabilities (21,546 ) (278,562 ) (221,860 ) (394,320 ) (916,288 ) Non-current (36,255 ) (16,127 ) (83,274 ) (2,014,925 ) (2,150,581 ) Net assets 416,823 900,397 457,032 1,448,763 3,223,015 Book value of non-controlling 204,243 441,194 155,025 612,245 1,412,707 Sales 109,183 1,232,113 490,193 719,087 2,550,576 Profit for the period 66,320 135,482 21,222 66,419 289,443 Profit for the period attributable to non-controlling 32,497 66,386 7,199 20,447 126,529 Cash flows from operating activities 123,534 129,801 62,578 60,021 375,934 Cash flows from investing activities (5,276 ) (193,408 ) (8,622 ) (409,353 ) (616,659 ) Cash flows from financing activities before dividends to non-controlling (44,442 ) (15,606 ) (55,504 ) 339,432 223,880 Dividends to non-controlling (48,855 ) (14,994 ) (1,419 ) (20,840 ) (86,108 ) Effect of exchange rate fluctuation (7,432 ) (1,267 ) (101 ) (24,206 ) (33,006 ) Net increase (decrease) of cash and cash equivalents 17,529 (95,474 ) (3,068 ) (54,946 ) (135,959 ) 2018 Description KEPCO Ilijan KEPCO Plant KEPCO Construction Others Total In millions of won Percentage of ownership 49.00 % 49.00 % 33.92 % Current assets ￦ 163,622 628,725 281,390 956,928 2,030,665 Non-current 267,822 646,640 490,090 2,760,500 4,165,052 Current liabilities (16,819 ) (270,097 ) (248,402 ) (559,552 ) (1,094,870 ) Non-current (36,594 ) (26,331 ) (61,698 ) (1,933,583 ) (2,058,206 ) Net assets 378,031 978,937 461,380 1,224,293 3,042,641 Book value of non-controlling 185,235 479,679 156,500 680,963 1,502,377 Sales 99,844 1,239,604 433,701 966,037 2,739,186 Profit for the period 49,631 160,791 12,937 92,457 315,816 Profit for the period attributable to non-controlling 24,319 78,788 4,388 28,475 135,970 Cash flows from operating activities 92,822 129,700 81,042 110,448 414,012 Cash flows from investing activities (4,452 ) (123,593 ) (50,569 ) 35,167 (143,447 ) Cash flows from financing activities before dividends to non-controlling (53,733 ) (33,737 ) (14,591 ) (374,669 ) (476,730 ) Dividends to non-controlling (51,626 ) (32,414 ) (2,839 ) (23,452 ) (110,331 ) Effect of exchange rate fluctuation 2,840 (124 ) 31 1,304 4,051 Net increase (decrease) of cash and cash equivalents (14,149 ) (60,168 ) 13,074 (251,202 ) (312,445 ) 2019 Description KEPCO Ilijan KEPCO Plant KEPCO Construction Others Total In millions of won Percentage of ownership 49.00 % 49.00 % 33.92 % Current assets ￦ 173,931 779,764 257,593 864,596 2,075,884 Non-current 197,446 577,219 477,614 3,169,317 4,421,596 Current liabilities (11,990 ) (247,737 ) (223,522 ) (450,311 ) (933,560 ) Non-current (44,166 ) (47,020 ) (19,472 ) (2,193,501 ) (2,304,159 ) Net assets 315,221 1,062,226 492,213 1,390,101 3,259,761 Book value of non-controlling 154,458 520,491 166,959 551,423 1,393,331 Sales 95,072 1,244,613 448,635 855,023 2,643,343 Profit for the period 40,818 157,737 26,398 (48,963 ) 175,990 Profit for the period attributable to non-controlling 20,001 77,291 8,954 (24,264 ) 81,982 Cash flows from operating activities 101,707 164,373 27,081 219,450 512,611 Cash flows from investing activities 4,458 (89,159 ) 47,219 (356,434 ) (393,916 ) Cash flows from financing activities before dividends to non-controlling (68,678 ) (44,332 ) (34,632 ) 223,233 75,591 Dividends to non-controlling (48,750 ) (39,466 ) (1,807 ) (9,233 ) (99,256 ) Effect of exchange rate fluctuation 2,111 (593 ) (14 ) 2,501 4,005 Net increase (decrease) of cash and cash equivalents (9,152 ) (9,177 ) 37,847 79,517 99,035 (7) Changes in goodwill (i) Details of goodwill as of December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Acquisition cost ￦ 2,582 97,977 Less: Accumulated impairment — — Carrying book value ￦ 2,582 97,977 (ii) Changes in goodwill for the years ended December 31, 2018 and 2019 are as follows: 2018 Beginning Increase Decrease Ending In millions of won Acquisition cost ￦ 2,582 — — 2,582 Less: Accumulated impairment — — — — Carrying book value 2,582 — — 2,582 2019 Beginning Increase Decrease Ending In millions of won Acquisition cost ￦ 2,582 95,395 — 97,977 Less: Accumulated impairment — — — — Carrying book value 2,582 95,395 — 97,977 (8) Disposals of subsidiaries The Company has completed liquidation process of KEPCO Singapore Holdings Pte., Ltd., and Korea Electric Power Nigeria Ltd., and is in the process of liquidating Garolim Tidal Power Plant Co., Ltd., as of December 31, 2019. (i) The fair value of proceeds from disposal as of December 31, 2017, 2018 and 2019, respectively, are as follows: 2017 2018 2019 In millions of won Consideration received in cash ￦ — 160 4 ￦ — 160 4 (ii) The carrying value of assets and liabilities of subsidiaries as of the date the Company lost its control during the years ended December 31, 2017, 2018 and 2019, respectively, are as follows: 2017 2018 2019 In millions of won Assets Cash and cash equivalents ￦ — 175 97 Trade and other receivables — 11 — Other non-financial — — 1 PP&E and intangible assets — — 2 Liabilities Trade and other payables — (28 ) (3 ) Other non-financial — — (24 ) ￦ — 158 73 (iii) Gain on disposals of subsidiaries for the years ended December 31, 2017, 2018 and 2019, respectively, are as follows: 2017 2018 2019 In millions of won Fair value of sale price ￦ — 160 4 Net assets disposed — (158 ) (73 ) Non-controlling — — — Realization of unrealized gain — 70 (187 ) Other comprehensive income — — — Gain (loss) on disposals of subsidiaries(*1) ￦ — 72 (256 ) (*1) Gain (loss) on disposals of subsidiaries is included in the consolidated statements of comprehensive income (loss). (iv) Net cash flow from disposals of subsidiaries for the years ended December 31, 2017, 2018 and 2019, respectively, are as follows: 2017 2018 2019 In millions of won Consideration received in cash ￦ — 160 4 Less: cash held by disposed subsidiaries — (175 ) (97 ) Net cash flow ￦ — (15 ) (93 ) (9) Cash dividends received from subsidiaries for the years ended December 31, 2017, 2018 and 2019, respectively, are as follows: Subsidiaries 2017 2018 2019 In millions of won Korea Hydro & Nuclear Power Co., Ltd. ￦ 543,072 281,234 — Korea South-East Power Co., Ltd. 106,546 33,928 7,143 Korea Midland Power Co., Ltd. 54,305 26,581 — Korea Western Power Co., Ltd. 66,992 28,996 — Korea Southern Power Co., Ltd. 60,630 25,780 15,277 Korea East-West Power Co., Ltd. 94,430 61,408 985 KEPCO Engineering & Construction Company, Inc. 2,765 5,531 3,519 KEPCO Plant Service & Engineering Co., Ltd. 15,607 33,739 41,084 KEPCO Nuclear Fuel Co., Ltd. 3,231 1,077 4,219 KEPCO KDN Co., Ltd. 4,352 13,888 19,136 KEPCO International HongKong Ltd. 4,304 23,314 10,243 KEPCO International Philippines Inc. 44,906 52,507 70,480 KEPCO Ilijan Corporation 50,849 53,900 65,776 KEPCO Philippines Holdings Inc. 26,023 — 63,522 KOSEP Australia Pty., Ltd. — — 8,120 KOSPO Australia Pty., Ltd. — — 4,335 Qatrana Electric Power Company 5,939 6,240 10,313 KEPCO KPS Philippines Corp. — — 3,854 Tamra Offshore Wind Power Co., Ltd. — — 4,823 KEPCO Netherlands S3 B.V. — 3,115 874 PT. KOMIPO Pembangkitan Jawa Bali 3,188 20,658 1,971 KEPCO Netherlands J3 B.V. — 12,090 — Gyeongju Wind Power Co., Ltd. — — 2,800 Energy New Industry Specialized Investment Private Investment Trust 291 — — HI Carbon Professional Private Special Asset Investment T

Investments in Associates and J

Investments in Associates and Joint Ventures	12 Months Ended
	Dec. 31, 2019
Investments in Associates and Joint Ventures [Abstract]
Investments in Associates and Joint Ventures	17. Investments in Associates and Joint Ventures (1) Investments in associates and joint ventures as of December 31, 2018 and 2019 are as follows: 2018 Investees Key operation activities Location Percentage of Acquisition Book In millions of won <Associates> Korea Gas Corporation(*1) Importing and wholesaling LNG KOREA 20.47 % ￦ 94,500 1,701,848 Korea Electric Power Industrial Development Co., Ltd. Electricity metering and others KOREA 29.00 % 4,727 21,838 YTN Co., Ltd. Broadcasting KOREA 21.43 % 59,000 40,338 Cheongna Energy Co., Ltd. Generating and distributing vapor and hot/cold water KOREA 43.90 % 48,353 3,465 Gangwon Wind Power Co., Ltd.(*2) Power generation KOREA 15.00 % 5,725 13,220 Hyundai Green Power Co., Ltd. Power generation KOREA 29.00 % 88,885 127,160 Korea Power Exchange(*5) Management of power market and others KOREA 100.00 % 127,839 251,802 AMEC Partners Korea Ltd.(*3) Resources development KOREA 19.00 % 707 209 Hyundai Energy Co., Ltd.(*8) Power generation KOREA 30.66 % 71,070 — Ecollite Co., Ltd. Artificial light-weight aggregate KOREA 36.10 % 1,516 — Taebaek Wind Power Co., Ltd. Power generation KOREA 25.00 % 3,810 5,665 Taeback Guinemi Wind Power Co., Ltd. Power generation KOREA 25.00 % 3,420 2,569 Pyeongchang Wind Power Co., Ltd. Power generation KOREA 25.00 % 3,875 5,419 Daeryun Power Co., Ltd.(*3) Power generation KOREA 9.34 % 40,854 26,099 Changjuk Wind Power Co., Ltd. Power generation KOREA 30.00 % 3,801 8,086 KNH Solar Co., Ltd. Power generation KOREA 27.00 % 1,296 2,337 SPC Power Corporation Power generation PHILIPPINES 38.00 % 20,635 57,558 Gemeng International Energy Co., Ltd. Power generation CHINA 34.00 % 413,153 647,010 PT. Cirebon Electric Power Power generation INDONESIA 27.50 % 40,365 108,628 KNOC Nigerian East Oil Co., Ltd.(*4) Resources development NIGERIA 14.63 % 12 — KNOC Nigerian West Oil Co., Ltd.(*4) Resources development NIGERIA 14.63 % 12 — PT Wampu Electric Power Power generation INDONESIA 46.00 % 21,292 31,097 PT. Bayan Resources TBK Resources development INDONESIA 20.00 % 615,860 511,646 S-Power Power generation KOREA 49.00 % 132,300 114,566 Pioneer Gas Power Limited(*7) Power generation INDIA 38.50 % 49,831 20,395 Eurasia Energy Holdings Power generation and resources development RUSSIA 40.00 % 461 — Xe-Pian Xe-Namnoy Power generation LAOS 25.00 % 84,374 77,165 Hadong Mineral Fiber Co., Ltd.(*3) Recycling fly ashes KOREA 8.33 % 50 — Green Biomass Co., Ltd.(*10) Power generation KOREA 8.80 % 714 115 PT. Mutiara Jawa Manufacturing and operating floating coal terminal INDONESIA 29.00 % 2,978 365 Samcheok Eco Materials Co., Ltd.(*9) Recycling fly ashes KOREA 2.35 % 686 — Noeul Green Energy Co., Ltd. Power generation KOREA 29.00 % 1,740 8,015 Naepo Green Energy Co., Ltd. Power generation KOREA 41.67 % 29,200 — Goseong Green Energy Co., Ltd.(*2) Power generation KOREA 1.12 % 2,900 2,459 Gangneung Eco Power Co., Ltd.(*2) Power generation KOREA 1.61 % 2,900 2,495 Shin Pyeongtaek Power Co., Ltd. Power generation KOREA 40.00 % 72,000 67,600 Heang Bok Do Si Photovoltaic Power Co., Ltd. Power generation KOREA 28.00 % 194 202 Dongducheon Dream Power Co., Ltd.(*14) Power generation KOREA 33.61 % 148,105 76,386 Jinbhuvish Power Generation Pvt. Ltd.(*2) Power generation INDIA 5.16 % ￦ 9,000 — SE Green Energy Co., Ltd. Power generation KOREA 47.76 % 3,821 3,366 Daegu Photovoltaic Co., Ltd. Power generation KOREA 29.00 % 1,230 2,002 Jeongam Wind Power Co., Ltd. Power generation KOREA 40.00 % 5,580 4,589 Korea Power Engineering Service Co., Ltd. Construction and service KOREA 29.00 % 290 4,333 Busan Green Energy Co., Ltd. Power generation KOREA 29.00 % 5,243 12,537 Gunsan Bio Energy Co., Ltd.(*2) Power generation KOREA 18.87 % 1,000 — Korea Electric Vehicle Charging Service Electric vehicle charge service KOREA 28.00 % 2,800 1,593 Ulleungdo Natural Energy Co., Ltd. Renewable power generation KOREA 29.85 % 8,000 4,628 Korea Nuclear Partners Co., Ltd. Electric material agency KOREA 29.00 % 290 175 Tamra Offshore Wind Power Co., Ltd. Power generation KOREA 27.00 % 8,910 10,401 Korea Electric Power Corporation Fund(*11) Developing electric enterprises KOREA 98.09 % 51,500 47,189 Energy Infra Asset Management Co., Ltd.(*3) Asset management KOREA 9.90 % 297 665 Daegu clean Energy Co., Ltd. Renewable power generation KOREA 28.00 % 140 17 YaksuESS Co., Ltd Installing ESS related equipment KOREA 29.00 % 210 460 Nepal Water & Energy Development Company Private Limited(*13) Construction and operation of utility plant NEPAL 57.67 % 33,577 30,961 Gwangyang Green Energy Co., Ltd. Power generation KOREA 20.00 % 2,000 1,206 PND solar., Ltd Power generation KOREA 29.00 % 1,250 1,020 Hyundai Eco Energy Co., Ltd.(*2) Power generation KOREA 19.00 % 3,610 3,388 YeongGwang Yaksu Wind Electric. Co., Ltd(*2) Power generation KOREA 9.63 % 533 533 2,338,421 4,064,820 <Joint ventures> KEPCO-Uhde Inc.(*6) Power generation KOREA 52.80 % 11,355 188 Eco Biomass Energy Sdn. Bhd.(*6) Power generation MALAYSIA 61.53 % 14,439 — Shuweihat Asia Power Investment B.V. Holding company NETHERLANDS 49.00 % 44,405 27,251 Shuweihat Asia Operation & Maintenance Company(*6) Maintenance of utility plant CAYMAN 55.00 % 30 792 Waterbury Lake Uranium L.P. Resources development CANADA 34.07 % 26,602 19,032 ASM-BG Power generation BULGARIA 50.00 % 16,101 21,379 RES Technology AD Power generation BULGARIA 50.00 % 15,595 15,209 KV Holdings, Inc. Power generation PHILIPPINES 40.00 % 2,103 1,918 KEPCO SPC Power Corporation(*6) Construction and operation of utility plant PHILIPPINES 75.20 % 94,579 208,306 Gansu Datang Yumen Wind Power Co., Ltd. Power generation CHINA 40.00 % 16,621 9,981 Datang Chifeng Renewable Power Co., Ltd. Power generation CHINA 40.00 % 121,928 166,162 Datang KEPCO Chaoyang Renewable Power Co., Ltd. Power generation CHINA 40.00 % ￦ 10,858 39,442 Rabigh Electricity Company Power generation SAUDI ARABIA 40.00 % 109,743 105,328 Rabigh Operation & Maintenance Company Limited Maintenance of utility plant SAUDI ARABIA 40.00 % 70 5,834 Jamaica Public Service Company Limited Power generation JAMAICA 40.00 % 301,910 239,632 KW Nuclear Components Co., Ltd. Manufacturing KOREA 45.00 % 833 7,708 Busan Shinho Solar Power Co., Ltd. Power generation KOREA 25.00 % 2,100 4,761 GS Donghae Electric Power Co., Ltd. Power generation KOREA 34.00 % 204,000 240,591 Global Trade Of Power System Co., Ltd. Exporting products and technology of small or medium business by proxy KOREA 29.00 % 290 515 Expressway Solar-light Power Generation Co., Ltd. Power generation KOREA 29.00 % 1,856 2,676 Daejung Offshore Wind Power Co., Ltd. Power generation KOREA 49.90 % 5,190 2,669 Amman Asia Electric Power Company(*6) Power generation JORDAN 60.00 % 111,476 177,357 KAPES, Inc.(*6) R&D KOREA 51.00 % 5,629 9,079 Dangjin Eco Power Co., Ltd. Power generation KOREA 34.00 % 61,540 19,912 Honam Wind Power Co., Ltd. Power generation KOREA 29.00 % 3,480 4,860 Chun-cheon Energy Co., Ltd. Power generation KOREA 29.90 % 52,700 42,505 Yeonggwangbaeksu Wind Power Co., Ltd.(*3) Power generation KOREA 15.00 % 3,000 2,843 Nghi Son 2 Power LLC Power generation VIETNAM 50.00 % 2,781 — Kelar S.A(*6) Power generation CHILE 65.00 % 78,060 72,824 PT. Tanjung Power Indonesia Power generation INDONESIA 35.00 % 746 7,081 Incheon New Power Co., Ltd. Power generation KOREA 29.00 % 461 579 Seokmun Energy Co., Ltd. Power generation KOREA 29.00 % 15,370 16,751 Daehan Wind Power PSC Power generation JORDAN 50.00 % 3,191 1,632 Barakah One Company(*12) Power generation UAE 18.00 % 118 3,807 Nawah Energy Company(*12) Operation of utility plant UAE 18.00 % 296 274 MOMENTUM International thermonuclear experimental reactor construction management FRANCE 33.33 % 1 582 Daegu Green Power Co., Ltd. Power generation KOREA 29.00 % 46,225 41,110 Yeonggwang Wind Power Co., Ltd. Power generation KOREA 41.00 % 15,375 15,304 Chester Solar IV SpA(*6) Power generation CHILE 81.82 % 1,700 1,851 Chester Solar V SpA(*6) Power generation CHILE 81.82 % 525 474 Diego de Almagro Solar SpA(*6) Power generation CHILE 81.82 % 2,091 1,663 South Jamaica Power Company Limited Power generation JAMAICA 20.00 % 16,231 16,124 Daesan Green Energy Co., Ltd. Power generation KOREA 35.00 % 17,850 17,433 RE Holiday Holdings LLC Power generation USA 50.00 % 42,948 51,094 RE Pioneer Holdings LLC Power generation USA 50.00 % 27,891 38,898 RE Barren Ridge 1 Holdings LLC Power generation USA 50.00 % 28,021 41,415 RE Astoria 2 LandCo LLC Power generation USA 50.00 % 5,188 5,410 RE Barren Ridge LandCo LLC Power generation USA 50.00 % 2,187 1,898 Laurel SpA(*6) Power generation CHILE 81.82 % ￦ 1,222 921 KIAMCO KOWEPO Bannerton Hold Co Pty Ltd(*3) Power generation AUSTRALIA 12.37 % 4,095 3,940 Chile Solar JV SpA Power generation CHILE 50.00 % 36,654 36,865 Taebaek Gadeoksan Wind Power Co., Ltd. Power generation KOREA 46.58 % 8,500 8,508 Cheong-Song Noraesan Wind Power Co., Ltd. Power generation KOREA 24.76 % 2,073 2,073 Chester Solar I SpA(*6) Power generation CHILE 81.82 % 1,181 1,181 Solar Philippines Calatagan Corporation Power generation PHILIPPINES 38.00 % 47,903 47,903 1,647,317 1,813,525 ￦ 3,985,738 5,878,345 (*1) The effective percentage of ownership is 21.57% considering treasury stocks. (*2) The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint directors to the board of directors of the entity, and by strict decision criteria of the Company’s financial and operating policy of the board of directors. (*3) The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint a director to the board of directors of the entity. (*4) The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint one out of four members of the steering committee of the entity. Moreover, the Company has significant financial transactions, which can affect its influence on the entity. (*5) The effective percentage of ownership is 100%. However, the Government regulates the Company’s ability to make operating and financial decisions over the entity, as the Government requires maintaining arms-length transactions between KPX and the Company’s other subsidiaries. The Company can exercise significant influence by its right to nominate directors to the board of directors of the entity. (*6) The effective percentage of ownership is more than 50%. However, according to the shareholders’ agreement, all critical financial and operating decisions must be agreed to by all ownership parties. For this reason, the entities are classified as joint ventures. (*7) As of reporting date, the annual reporting period of all associates and joint ventures ends on December 31, except for Pioneer Gas Power Limited whose reporting period ends on March 31. (*8) As of December 31, 2018, 15.64% of ownership of Hyundai Energy Co., Ltd. is held by NH Power ll Co., Ltd. and NH Bank. According to the shareholders’ agreement reached on March 2011, not only does the Company have a call option to acquire the investment in Hyundai Energy Co., Ltd. from NH Power ll Co., Ltd. and NH Bank with a certain rate of return, NH Power ll Co., Ltd. and NH Bank also have put options to dispose of their investment to the Company. In connection with this agreement, the Company applied the equity method on the investment in Hyundai Energy Co., Ltd. with 46.30% of ownership. (*9) The Company’s effective percentage of ownership excluding the redeemable convertible preferred stock is 25.54%. (*10) The effective percentage of ownership is less than 20% but the Company can exercise significant influence by virtue of its contractual right to appoint a director to the board of directors of the entity and the fact that the dominant portion of the investee’s sales transactions is generated from the Company. (*11) The effective percentage of ownership is more than 50% but the Company does not hold control over relevant business while it exercises significant influence by participating in the Investment Decision Committee. For this reason, the entity is classified as an associate. (*12) The effective percentage of ownership is less than 20% but the Company has joint control over the entity as decisions on the major activities require the unanimous consent of the parties that collectively control the entity. (*13) The effective percentage of ownership is more than 50% but the Company does not hold control over the entity according to the shareholders’ agreement. For this reason, the entity is classified as an associate. (*14) The effective percentage of ownership is 34.01% considering redeemable convertible preferred stock. 2019 Investees Key operation activities Location Percentage of Acquisition Book value In millions of won <Associates> Korea Gas Corporation(*1) Importing and wholesaling LNG KOREA 20.47 % ￦ 94,500 1,693,967 Korea Electric Power Industrial Development Co., Ltd. Electricity metering and others KOREA 29.00 % 4,727 25,393 YTN Co., Ltd. Broadcasting KOREA 21.43 % 59,000 39,747 Cheongna Energy Co., Ltd. Generating and distributing vapor and hot/cold water KOREA 43.90 % 48,353 1,411 Gangwon Wind Power Co., Ltd.(*2) Power generation KOREA 15.00 % 5,725 12,327 Hyundai Green Power Co., Ltd. Power generation KOREA 29.00 % 88,885 124,253 Korea Power Exchange(*5) Management of power market and others KOREA 100.00 % 127,839 258,899 Hyundai Energy Co., Ltd.(*8) Power generation KOREA 30.66 % 71,070 — Ecollite Co., Ltd. Artificial light-weight aggregate KOREA 36.10 % 1,516 — Taebaek Wind Power Co., Ltd. Power generation KOREA 25.00 % 3,810 7,039 Taeback Guinemi Wind Power Co., Ltd. Power generation KOREA 25.00 % 3,420 2,553 Pyeongchang Wind Power Co., Ltd. Power generation KOREA 25.00 % 3,875 5,877 Daeryun Power Co., Ltd.(*3) Power generation KOREA 9.34 % 40,854 26,247 Changjuk Wind Power Co., Ltd. Power generation KOREA 30.00 % 3,801 8,520 KNH Solar Co., Ltd. Power generation KOREA 27.00 % 1,296 2,382 SPC Power Corporation Power generation PHILIPPINES 38.00 % 20,635 63,583 Gemeng International Energy Co., Ltd. Power generation CHINA 34.00 % 413,153 670,896 PT. Cirebon Electric Power Power generation INDONESIA 27.50 % 40,365 123,425 KNOC Nigerian East Oil Co., Ltd.(*4) Resources development NIGERIA 14.63 % 12 — KNOC Nigerian West Oil Co., Ltd.(*4) Resources development NIGERIA 14.63 % 12 — PT Wampu Electric Power Power generation INDONESIA 46.00 % 21,292 29,355 PT. Bayan Resources TBK Resources development INDONESIA 20.00 % 615,860 445,141 S-Power Power generation KOREA 49.00 % 132,300 115,784 Pioneer Gas Power Limited(*7) Power generation INDIA 38.50 % 49,831 — Eurasia Energy Holdings Power generation and resources development RUSSIA 40.00 % 461 — Xe-Pian Xe-Namnoy Power generation LAOS 25.00 % 87,426 72,935 Hadong Mineral Fiber Co., Ltd.(*3) Recycling fly ashes KOREA 8.33 % 50 — Green Biomass Co., Ltd.(*10) Power generation KOREA 7.85 % 714 108 PT. Mutiara Jawa Manufacturing and operating floating coal terminal INDONESIA 29.00 % 2,978 1,438 Samcheok Eco Materials Co., Ltd.(*9) Recycling fly ashes KOREA 2.35 % 686 — Noeul Green Energy Co., Ltd. Power generation KOREA 29.00 % 1,740 6,610 Naepo Green Energy Co., Ltd. Power generation KOREA 41.67 % 29,200 — Goseong Green Energy Co., Ltd.(*2) Power generation KOREA 1.12 % 2,900 2,340 Gangneung Eco Power Co., Ltd.(*2) Power generation KOREA 1.61 % ￦ 2,900 2,430 Shin Pyeongtaek Power Co., Ltd. Power generation KOREA 40.00 % 72,000 66,956 Heang Bok Do Si Photovoltaic Power Co., Ltd. Power generation KOREA 28.00 % 194 215 Dongducheon Dream Power Co., Ltd.(*14) Power generation KOREA 33.61 % 148,105 76,547 Jinbhuvish Power Generation Pvt. Ltd.(*2) Power generation INDIA 5.16 % 9,000 — Daejung Offshore Wind Power Co., Ltd.(*16) Power generation KOREA 49.90 % 5,190 2,361 GS Donghae Electric Power Co., Ltd.(*16) Power generation KOREA 34.00 % 204,000 255,983 Daegu Photovoltaic Co., Ltd. Power generation KOREA 29.00 % 1,230 2,060 Busan Green Energy Co., Ltd. Power generation KOREA 29.00 % 5,243 10,637 Gunsan Bio Energy Co., Ltd.(*2) Power generation KOREA 18.87 % 1,000 — Korea Electric Vehicle Charging Service Electric vehicle charge service KOREA 28.00 % 2,800 1,063 Korea Nuclear Partners Co., Ltd. Electric material agency KOREA 29.00 % 290 — Korea Electric Power Corporation Fund(*11) Developing electric enterprises KOREA 98.09 % 51,500 41,126 Energy Infra Asset Management Co., Ltd.(*3) Asset management KOREA 9.90 % 297 791 Daegu clean Energy Co., Ltd. Renewable power generation KOREA 28.00 % 140 13 YaksuESS Co., Ltd Installing ESS related equipment KOREA 29.00 % 210 516 Nepal Water & Energy Development Company Private Limited(*13) Construction and operation of utility plant NEPAL 57.76 % 35,571 31,145 Gwangyang Green Energy Co., Ltd. Power generation KOREA 20.00 % 2,000 948 PND solar., Ltd Power generation KOREA 29.00 % 1,250 1,144 Hyundai Eco Energy Co., Ltd.(*2) Power generation KOREA 19.00 % 3,610 3,781 YeongGwang Yaksu Wind Electric. Co., Ltd(*2) Power generation KOREA 9.63 % 533 386 Green Energy Electricity Generation Co., Ltd. Power generation KOREA 29.00 % 1,189 163 Korea Energy Solutions Co., Ltd. R & D KOREA 20.00 % 300 259 ITR Co., Ltd. R & D KOREA 20.00 % 50 33 Structure test network Co., Ltd. Technical testing and consulting KOREA 20.00 % 25 21 Namjeongsusang Solar Power Operation Co., Ltd.(*18) Power generation KOREA 15.00 % 969 812 Indeck Niles Development, LLC(*23) Power generation USA 50.00 % — — Indeck Niles Asset Management, LLC Power generation USA 33.33 % — 87 Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1 Holding company KOREA 49.00 % 7,105 7,126 Suwon New Power Co., Ltd. Power generation KOREA 39.90 % 798 798 KPGE Inc. Power generation materials business KOREA 29.00 % ￦ 287 287 Gwangbaek Solar Power Investment Co., Ltd.(*21) Power generation KOREA 19.00 % 2,054 2,054 Goduk Clean Energy Co., Ltd.(*20) Fuel cell generation KOREA 61.00 % 1,830 1,830 2,539,956 4,251,802 <Joint ventures> KEPCO-Uhde Inc.(*6) Power generation KOREA 52.80 % 11,355 134 Shuweihat Asia Power Investment B.V. Holding company NETHERLANDS 49.00 % 44,405 18,318 Shuweihat Asia Operation & Maintenance Company(*6) Maintenance of utility plant CAYMAN 55.00 % 30 1,408 Waterbury Lake Uranium L.P. Resources development CANADA 33.48 % 26,602 20,562 ASM-BG Power generation BULGARIA 50.00 % 16,101 19,376 RES Technology AD Power generation BULGARIA 50.00 % 15,595 16,248 KV Holdings, Inc. Power generation PHILIPPINES 40.00 % 2,103 2,441 KEPCO SPC Power Corporation(*6) Construction and operation of utility plant PHILIPPINES 75.20 % 94,579 214,794 Gansu Datang Yumen Wind Power Co., Ltd. Power generation CHINA 40.00 % 16,621 8,149 Datang Chifeng Renewable Power Co., Ltd. Power generation CHINA 40.00 % 121,928 185,307 Datang KEPCO Chaoyang Renewable Power Co., Ltd. Power generation CHINA 40.00 % 10,858 41,024 Rabigh Electricity Company Power generation SAUDI ARABIA 40.00 % 109,743 109,096 Rabigh Operation & Maintenance Company Limited Maintenance of utility plant SAUDI ARABIA 40.00 % 70 6,879 Jamaica Public Service Company Limited Power generation JAMAICA 40.00 % 301,910 253,607 KW Nuclear Components Co., Ltd. Manufacturing KOREA 45.00 % 833 9,052 Busan Shinho Solar Power Co., Ltd. Power generation KOREA 25.00 % 2,100 5,045 Global Trade Of Power System Co., Ltd. Exporting products and technology of small or medium business by proxy KOREA 29.00 % 290 571 Expressway Solar-light Power Generation Co., Ltd. Power generation KOREA 29.00 % 1,856 2,883 Amman Asia Electric Power Company(*6) Power generation JORDAN 60.00 % 111,476 192,164 KAPES, Inc.(*6) R&D KOREA 51.00 % 5,629 10,832 Honam Wind Power Co., Ltd. Power generation KOREA 29.00 % 3,480 4,375 Jeongam Wind Power Co., Ltd.(*16) Power generation KOREA 40.00 % 5,580 4,437 Korea Power Engineering Service Co., Ltd.(*16) Construction and service KOREA 29.00 % 290 4,902 Chun-cheon Energy Co., Ltd. Power generation KOREA 29.90 % 52,700 34,872 Yeonggwangbaeksu Wind Power Co., Ltd.(*3) Power generation KOREA 15.00 % 3,000 3,040 Nghi Son 2 Power LLC Power generation VIETNAM 50.00 % 2,781 — Kelar S.A(*6) Power generation CHILE 65.00 % ￦ 78,060 70,462 PT. Tanjung Power Indonesia Power generation INDONESIA 35.00 % 26,892 34,327 Incheon New Power Co., Ltd. Power generation KOREA 29.00 % 461 — Seokmun Energy Co., Ltd. Power generation KOREA 29.00 % 15,370 17,342 Daehan Wind Power PSC Power generation JORDAN 50.00 % 3,191 1,757 Barakah One Company(*12) Power generation UAE 18.00 % 118 — Nawah Energy Company(*12) Operation of utility plant UAE 18.00 % 296 285 MOMENTUM International thermonuclear experimental reactor construction management FRANCE 33.33 % 1 553 Daegu Green Power Co., Ltd. Power generation KOREA 29.00 % 46,225 22,824 Yeonggwang Wind Power Co., Ltd. Power generation KOREA 46.00 % 17,475 17,627 Chester Solar IV SpA Power generation CHILE 45.00 % 1,700 672 Chester Solar V SpA Power generation CHILE 45.00 % 525 146 Diego de Almagro Solar SpA Power generation CHILE 45.00 % 2,091 1,035 South Jamaica Power Company Limited Power generation JAMAICA 20.00 % 20,521 13,863 Daesan Green Energy Co., Ltd. Power generation KOREA 35.00 % 17,850 17,182 RE Holiday Holdings LLC Power generation USA 50.00 % 42,948 42,070 RE Pioneer Holdings LLC Power generation USA 50.00 % 27,891 31,156 RE Barren Ridge 1 Holdings LLC Power generation USA 50.00 % 28,021 42,916 RE Astoria 2 LandCo LLC Power generation USA 50.00 % 5,188 5,602 RE Barren Ridge LandCo LLC Power generation USA 50.00 % 2,187 1,966 Laurel SpA Power generation CHILE 45.00 % 1,222 595 KIAMCO KOWEPO Bannerton Hold Co Pty Ltd(*3) Power generation AUSTRALIA 12.37 % 4,095 4,024 Chile Solar JV SpA Power generation CHILE 50.00 % 37,689 34,859 Taebaek Gadeoksan Wind Power Co., Ltd. Power generation KOREA 37.78 % 8,500 7,846 Cheong-Song Noraesan Wind Power Co., Ltd. Power generation KOREA 29.01 % 3,200 3,043 Chester Solar I SpA Power generation CHILE 45.00 % 1,181 1,157 Solar Philippines Calatagan Corporation Power generation PHILIPPINES 38.00 % 47,903 48,930 Saemangeum Solar Power Co., Ltd.(*22) Power generation KOREA 81.00 % 10,000 8,324 Chungsongmeon BongSan wind power Co., Ltd. Power generation KOREA 29.00 % 2,900 2,764 Jaeun Resident Wind Power Plant Co., Ltd. Power generation KOREA 29.00 % 2,494 2,198 DE Energia SpA Power generation CHILE 49.00 % 8,364 8,665 Dangjin Eco Power Co., Ltd. (newly)(*15) Power generation KOREA 34.00 % 25,661 25,661 Haemodum Solar Co., Ltd. Power generation KOREA 49.00 % 2,940 2,940 Yangyang Wind Power Co., Ltd.(*17) Power generation KOREA 99.54 % 10,800 10,800 HORUS SOLAR, S.A. DE C.V.(*19) Renewable power generation MEXICO 14.95 % 3,403 3,403 RECURSOS SOLARES PV DE MEXICO II, S.A. DE C.V.(*19) Renewable power generation MEXICO 14.95 % ￦ 672 672 SUNMEX RENOVABLES, S.A. DE C.V.(*19) Renewable power generation MEXICO 14.95 % 222 222 Stavro Holding II AB Holding company SWEDEN 20.00 % 5,524 5,625 1,475,696 1,663,029 ￦ 4,015,652 5,914,831 (*1) The effective percentage of ownership is 21.57% considering treasury stocks. (*2) The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint directors to the board of directors of the entity, and by strict decision criteria of the Company’s financial and operating policy of the board of directors. (*3) The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint a director to the board of directors of the entity. (*4) The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint one out of four members of the steering committee of the entity. Moreover, the Company has significant financial transactions, which can affect its influence on the entity. (*5) The effective percentage of ownership is 100%. However, the Government regulates the Company’s ability to make operating and financial decisions over the entity, as the Government requires maintaining arms-length transactions between KPX and the Company’s other subsidiaries. The Company can exercise significant influence by virtue of right to nominate directors to the board of directors of the entity. (*6) The effective percentage of ownership is more than 50%. However, according to the shareholders’ agreement, all critical financial and operating decisions must be agreed to by all ownership parties. For this reason, the entities are classified as joint ventures. (*7) As of reporting date, the annual reporting period of all associates and joint ventures ends on December 31, except for Pioneer Gas Power Limited whose reporting period ends on March 31. (*8) As of December 31, 2019, 15.64% of ownership of Hyundai Energy Co., Ltd. is held by NH Power ll Co., Ltd. and NH Bank. According to the shareholders’ agreement reached on March 2011, not only does the Company have a call option to acquire the investment in Hyundai Energy Co., Ltd. from NH Power ll Co., Ltd. and NH Bank with a certain rate of return, NH Power ll Co., Ltd. and NH Bank also have put options to dispose of their investment to the Company. In connection with this agreement, the Company applied the equity method on the investment in Hyundai Energy Co., Ltd. with 46.30% of ownership. (*9) The Company’s effective percentage of ownership excluding the redeemable convertible preferred stock is 25.54%. (*10) The effective percentage of ownership is less than 20% but the Company can exercise significant influence by virtue of its contractual right to appoint a director to the board of directors of the entity and the fact that the dominant portion of the investee’s sales transactions is generated from the Company. (*11) The effective percentage of ownership is more than 50% but the Company does not hold control over relevant business while it exercises significant influence by participating in the Investment Decision Committee. For this reason, the entity is classified as an associate. (*12) The effective percentage of ownership is less than 20% but the Company has joint control over the entity as decisions on the major activities require the unanimous consent of the parties that collectively control the entity. (*13) The effective percentage of ownership is more than 50% but the Company does not hold control over the entity according to the shareholders’ agreement. For this reason, the entity is classified as an associate. (*14) The effective percentage of ownership is 34.01% considering the conversion of redeemable convertible preferred stock into ordinary stock. (*15) Eumseong Natural Gas Power Co., Ltd. and Dangjin Eco Solar Power Co., Ltd. were established by spin-off spin-off, (*16) Daejung Offshore Wind Power Co., Ltd. and GS Donghae Electric Power Co., Ltd. are reclassified from joint ventures to associates, and Jeongam Wind Power Co., Ltd. and Korea Power Engineering Service Co., Ltd. are reclassified from associates to joint ventures during the year ended December 31, 2019. (*17) The temporary percentage of ownership is more than 50% due to differences in the timing of the payment. The Company is expected to exert significant influence after payment is completed in the first quarter of 2020. (*18) The effective percentage of ownership is less than 20%. However, the Company considers the major decision-making body to be the general decision of the board of directors, and the general decision of the board of directors can be passed only by two directors. For this reason, the entities are classified as an associate. (*19) The effective percentage of ownership is less than 20%. However, according to the shareholders’ agreement, decisions on the major activities must be agreed to by all ownership parties. For this reason, the entities are classified as joint ventures. (*20) The effective percentage of ownership is 61%. However, it seems the Company doesn’t have power on the Goduk Clean Energy Co., Ltd. due to its proportion to make decisions, which is less than 50%. The Company can exercise significant influence on the entity by participating in the board of directors and others. Therefore, the entity is classified as an associate. (*21) The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint a director to the board of directors of the entity. (*22) The effective percentage of ownership is more than 50%. However, according to the shareholders’ agreement, all operation related decisions must be agreed by all ownership parties. For this reason, the entity is classified as a joint venture. (*23) Although the investment amount is not paid as of December 31, 2019, the Company has an investment agreement on 50% of the interests. the Company can exercise significant influence by virtue of its contractual right to appoint a director to the board of directors of the entity. (2) The fair value of associates which are actively traded on an open market and have a readily available market value as of December 31, 2018 and 2019 are as follows: Investees 2018 2019 In millions of won <Associates> Korea Electric Power Industrial Development Co., Ltd. ￦ 33,609 33,089 Korea Gas Corporation(*) 910,980 715,365 YTN Co., Ltd. 18,900 18,450 SPC Power Corporation 72,710 117,230 PT. Bayan Resources TBK 1,017,601 880,860 (*) An indicator of impairment has been identified for the Company’s investment in Korea Gas Corporation (‘‘KOGAS’’) for the years ended December 31, 2018 and 2019 as management determined that the carrying amount of the investment in KOGAS at ￦1,701,848 million and ￦1,693,967 million respectively were significantly higher than its fair value. Accordingly, management has assessed the recoverable amount of the investment by estimating the Company’s share of the present value of the estimated future cash flows expected to be generated by KOGAS. The carrying amount of KOGAS as at December 31, 2018 and 2019 are supported by the recoverable amount determination and as such, no impairment has been recognized for the years ended December 31, 2018 and 2019. The recoverable amount estimate is most sensitive to assumptions regarding long-term revenue forecasts as well as the discount rate: • Revenue forecasts: price and volume of gas sold are based on the long-term natural gas supply and demand programs approved by the Ministry of Trade, Industry & Energy. • Discount rate: the discount rate is derived using the weighted average cost of capital methodology adjusted for any risks that are not reflected in the underlying cash flows. A real post-tax discount rate of 4.80% and 4.70% was applied to post-tax cash flows respectively as at December 31, 2018 and 2019. Changes in circumstances may affect the assumptions used to determine recoverable amount and could result in an impairment of KOGAS at future reporting dates. (3) Changes in investments in associates and joint ventures for the years ended December 31, 2018 and 2019 are as follows: 2018 Investees Beginning Acquisition Disposal Dividends Share of Other (loss) Others Ending In millions of won <Associates> Korea Gas Corporation ￦ 1,618,868 — — — 107,952 (24,843 ) (129 ) 1,701,848 Korea Electric Power Industrial Development Co., Ltd. 21,838 — — (1,872 ) 2,584 (102 ) (610 ) 21,838 YTN Co., Ltd. 40,606 — — (180 ) 545 (186 ) (447 ) 40,338 Cheongna Energy Co., Ltd. 8,337 — — — (4,872 ) — — 3,465 Gangwon Wind Power Co., Ltd. 13,855 — — (2,272 ) 1,637 — — 13,220 Hyundai Green Power Co., Ltd. 114,806 — — (8,889 ) 21,243 — — 127,160 Korea Power Exchange 237,631 — — — 16,031 — (1,860 ) 251,802 AMEC Partners Korea Ltd. 215 — — — (6 ) — — 209 Hyundai Energy Co., Ltd. — — — — — — — — Ecollite Co., Ltd. — — — — — — — — Taebaek Wind Power Co., Ltd. 5,319 — — (196 ) 542 — — 5,665 Taeback Guinemi Wind Power Co., Ltd. 3,089 — — — (520 ) — — 2,569 Pyeongchang Wind Power Co., Ltd. 4,136 — — — 1,283 — — 5,419 Daeryun Power Co., Ltd.(*5) 25,113 — — — (189 ) 184 991 26,099 Changjuk Wind Power Co., Ltd. 7,515 — — (416 ) 987 — — 8,086 KNH Solar Co., Ltd. 2,218 — — — 119 — — 2,337 SPC Power Corporation 52,283 — — (9,549 ) 4,235 10,578 11 57,558 Gemeng International Energy Co., Ltd. 649,973 — — (11,246 ) 15,156 (6,873 ) — 647,010 PT. Cirebon Electric Power 97,410 — — (4,432 ) 9,385 6,265 — 108,628 KNOC Nigerian East Oil Co., Ltd. — — — — 2,615 (471 ) (2

Property, Plant and Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	18. Property, Plant and Equipment (1) Property, plant and equipment as of December 31, 2018 and 2019 are as follows: 2018 Acquisition cost Government grants Accumulated depreciation Accumulated losses Book value In millions of won Land ￦ 13,554,292 (21,968 ) — — 13,532,324 Buildings 19,431,536 (63,189 ) (7,494,176 ) (3,669 ) 11,870,502 Structures 66,335,506 (190,854 ) (23,615,312 ) (8,399 ) 42,520,941 Machinery 82,047,823 (173,242 ) (34,151,878 ) (439,350 ) 47,283,353 Ships 3,655 — (3,353 ) — 302 Vehicles 287,954 (4,220 ) (215,649 ) (116 ) 67,969 Equipment 1,558,309 (418 ) (1,175,408 ) (42 ) 382,441 Tools 1,073,145 (675 ) (880,432 ) (38 ) 192,000 Construction-in- 29,026,880 (54,740 ) — (205,713 ) 28,766,427 Finance lease assets 2,390,701 (26 ) (2,194,971 ) — 195,704 Asset retirement costs 9,424,181 — (3,706,004 ) (146,423 ) 5,571,754 Others 11,875,394 — (9,515,917 ) — 2,359,477 ￦ 237,009,376 (509,332 ) (82,953,100 ) (803,750 ) 152,743,194 2019 Acquisition cost Government grants Accumulated depreciation Accumulated losses Book value In millions of won Land ￦ 13,848,063 (21,817 ) — — 13,826,246 Buildings 20,756,351 (61,920 ) (8,305,683 ) (4,962 ) 12,383,786 Structures 70,900,343 (186,554 ) (25,711,840 ) (9,633 ) 44,992,316 Machinery 89,224,339 (158,907 ) (38,865,392 ) (451,647 ) 49,748,393 Ships 3,104 — (2,903 ) — 201 Vehicles 309,829 (2,275 ) (239,128 ) (116 ) 68,310 Equipment 1,716,210 (241 ) (1,342,053 ) (42 ) 373,874 Tools 1,098,127 (403 ) (934,023 ) (40 ) 163,661 Construction-in-progress 28,584,806 (61,211 ) — (165,336 ) 28,358,259 Right-of-use 7,574,010 — (2,790,437 ) — 4,783,573 Asset retirement costs 11,690,188 — (4,169,238 ) (146,423 ) 7,374,527 Others 12,955,782 — (10,327,101 ) — 2,628,681 ￦ 258,661,152 (493,328 ) (92,687,798 ) (778,199 ) 164,701,827 (2) Changes in property, plant and equipment for the years ended December 31, 2018 and 2019 are as follows: 2018 Beginning Acquisition Disposal Depreciation Impairment(*1) Others Ending balance In millions of won Land ￦ 13,318,542 2,254 (18,240 ) — — 251,736 13,554,292 (Government grants) (21,968 ) — — — — — (21,968 ) Buildings 12,053,526 10,156 (8,545 ) (767,845 ) (1,896 ) 648,295 11,933,691 (Government grants) (63,539 ) (4,213 ) 31 6,836 — (2,304 ) (63,189 ) Structures 44,104,778 11,123 (587,278 ) (2,476,278 ) (360 ) 1,659,810 42,711,795 (Government grants) (196,414 ) — 3,270 10,292 — (8,002 ) (190,854 ) Machinery(*2) 46,875,798 460,676 (250,159 ) (4,973,252 ) (393,839 ) 5,737,371 47,456,595 (Government grants) (183,188 ) (1,185 ) 823 18,099 — (7,791 ) (173,242 ) Ships 403 — — (103 ) — 2 302 Vehicles 81,038 2,774 (402 ) (32,620 ) — 21,399 72,189 (Government grants) (6,322 ) (45 ) — 2,146 — 1 (4,220 ) Equipment 420,672 36,884 (265 ) (187,821 ) (36 ) 113,425 382,859 (Government grants) (761 ) (22 ) — 365 — — (418 ) Tools 200,663 12,331 (268 ) (83,283 ) (6 ) 63,238 192,675 (Government grants) (1,027 ) (44 ) — 432 — (36 ) (675 ) Construction-in-progress 25,572,541 11,749,397 (47,463 ) — (167,603 ) (8,285,705 ) 28,821,167 (Government grants) (49,084 ) (23,895 ) — — — 18,239 (54,740 ) Finance lease assets 297,679 — — (101,888 ) — (61 ) 195,730 (Government grants) (27 ) — — 1 — — (26 ) Asset retirement costs 6,039,484 1,988 — (610,435 ) (146,424 ) 287,141 5,571,754 Others 2,439,620 8,691 (715 ) (709,579 ) — 621,460 2,359,477 ￦ 150,882,414 12,266,870 (909,211 ) (9,904,933 ) (710,164 ) 1,118,218 152,743,194 (*1) Korea Hydro & Nuclear Power Co., Ltd. And Korea Western Power Co., Ltd., 100% owned subsidiaries, have determined that there are impairment indicators for the shutdowns of certain power generation units and fire, and performed an impairment test over the individual assets. As a result, the Company recognized the amount of the carrying amount in excess of its recoverable amount as an impairment loss in the consolidated statements of comprehensive income. (*2) As described in Note 26, the amount of acquisition of machinery includes ￦204,787 million of that the Company believes the possibility of economic benefit outflow is probable on the request for additional construction costs of Hyundai E&C, GS Engineering & Construction Corp. and Hansol SeenTec Co., Ltd. 2019 Beginning Effect of change Acquisition Disposal Depreciation Impairment Others Ending balance In millions of won Land ￦ 13,554,292 — 40,752 (29,205 ) — (25,626 ) 307,850 13,848,063 (Government grants) (21,968 ) — — 151 — — — (21,817 ) Buildings 11,933,691 — 3,195 (23,409 ) (821,680 ) (1,293 ) 1,355,202 12,445,706 (Government grants) (63,189 ) — (592 ) — 6,214 — (4,353 ) (61,920 ) Structures 42,711,795 — 1,663 (470,230 ) (2,399,283 ) (1,234 ) 5,336,159 45,178,870 (Government grants) (190,854 ) — — 2,405 9,373 — (7,478 ) (186,554 ) Machinery 47,456,595 — 326,606 (248,951 ) (5,452,669 ) (12,247 ) 7,837,966 49,907,300 (Government grants) (173,242 ) — (1,050 ) 635 17,993 — (3,243 ) (158,907 ) Ships 302 — — — (100 ) — (1 ) 201 Vehicles 72,189 — 3,789 4,558 (33,650 ) — 23,699 70,585 (Government grants) (4,220 ) — (228 ) 5 2,170 — (2 ) (2,275 ) Equipment 382,859 — 47,532 (162 ) (199,376 ) (227 ) 143,489 374,115 (Government grants) (418 ) — (81 ) — 262 — (4 ) (241 ) Tools 192,675 — 20,956 (31 ) (87,708 ) — 38,172 164,064 (Government grants) (675 ) — — — 281 — (9 ) (403 ) Construction-in-progress 28,821,167 — 13,544,091 (199,853 ) — (8,828 ) (13,737,107 ) 28,419,470 (Government grants) (54,740 ) — 12,338 — — — (18,809 ) (61,211 ) Finance lease assets 195,730 (195,730 ) — — — — — — (Government grants) (26 ) 26 — — — — — — Right-of-use — 5,143,651 220,996 — (581,074 ) — — 4,783,573 Asset retirement costs 5,571,754 — — — (626,856 ) — 2,429,629 7,374,527 Others 2,359,477 — 1,388 (221 ) (800,653 ) (581 ) 1,069,271 2,628,681 ￦ 152,743,194 4,947,947 14,221,355 (964,308 ) (10,966,756 ) (50,036 ) 4,770,431 164,701,827 (*1) KEPCO Bylong Australia Pty., Ltd., 100% owned subsidiary, performed an impairment test over its land and others. The Company recognized the amount of the carrying amount in excess of its recoverable amount as an impairment loss. (*2) ‘Others’ include the amounts of assets acquired by the business combination. (see Note 51) (*3) ‘Others’ include immaterial amounts which have been reclassed from Construction-in-progress (*4) As described in Note 2, the Company recognized impairment loss of ￦3,819 million related to Wolsong unit 1, Shin-Hanul unit 3 and 4 and reversal of impairment loss of ￦16,693 million related to Wolsong unit 1.

Investment Properties

Investment Properties	12 Months Ended
	Dec. 31, 2019
Investment Properties [Abstract]
Investment Properties	19. Investment Properties (1) Investment properties as of December 31, 2018 and 2019 are as follows: 2018 Acquisition Government Accumulated Book value In millions of won Land ￦ 139,940 — — 139,940 Buildings 34,801 (50 ) (15,132 ) 19,619 ￦ 174,741 (50 ) (15,132 ) 159,559 2019 Acquisition Government Accumulated Book value In millions of won Land ￦ 129,897 — — 129,897 Buildings 64,590 (13 ) (35,894 ) 28,683 ￦ 194,487 (13 ) (35,894 ) 158,580 (2) Changes in investment properties for the years ended December 31, 2018 and 2019 are as follows: 2018 Beginning Depreciation Others Ending In millions of won Land ￦ 264,205 — (124,265 ) 139,940 Buildings 20,592 (924 ) 1 19,669 (Government grants) (83 ) 1 32 (50 ) ￦ 284,714 (923 ) (124,232 ) 159,559 2019 Beginning Depreciation Others(*) Ending In millions of won Land ￦ 139,940 — (10,043 ) 129,897 Buildings 19,669 (5,070 ) 14,097 28,696 (Government grants) (50 ) 1 36 (13 ) ￦ 159,559 (5,069 ) 4,090 158,580 (*) As described in Note 42, the Company reclassified land and buildings amounting to ￦2,765 million and ￦19,369 million, respectively, from assets held-for-sale (3) Income and expenses related to investment properties for the years ended December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Rental income ￦ 9,494 9,782 Operating and maintenance expenses related to rental income (923 ) (1,257 ) Operating and maintenance expenses not related to rental income — (3,812 ) ￦ 8,571 4,713 (4) Fair value of investment properties as of December 31, 2018 and 2019 are as follows: 2018 2019 Book value Fair value Book value Fair value In millions of won Land ￦ 139,940 167,178 129,897 202,042 Buildings 19,619 23,276 28,683 38,046 ￦ 159,559 190,454 158,580 240,088 The fair values of the investment properties as of the reporting date were determined in consideration of the fluctuation on the publicly announced individual land price after the IFRS transition date (January 1, 2010). (5) All of the Company’s investment property is held under freehold interests.

Construction Services Contracts

Construction Services Contracts	12 Months Ended
	Dec. 31, 2019
Construction Services Contracts [Abstract]
Construction Services Contracts	20. Construction Contracts (1) Changes in total contract amount in which revenue is not yet recognized for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 Beginning balance Increase Recognized as revenue Ending In millions of won Nuclear power plant construction in UAE and others ￦ 7,236,888 151,891 (3,212,184 ) 4,176,595 (*) For the year ended December 31, 2017, the increased balance of contracts from new orders and other is ￦438,142 million and the decreased balance of contracts due to changes in scope of construction work is ￦286,251 million. 2018 Beginning balance Increase Recognized as revenue Ending In millions of won Nuclear power plant construction in UAE and others ￦ 4,176,595 1,186,584 (1,742,391 ) 3,620,788 (*) For the year ended December 31, 2018, the increased balance of contracts from new orders and foreign exchange impact is ￦1,207,097 million and the decreased balance of contracts due to changes in scope of construction work is ￦20,513 million. 2019 Beginning balance Increase Recognized as revenue Ending In millions of won Nuclear power plant construction in UAE and others ￦ 3,620,788 379,269 (1,264,916 ) 2,735,141 (*) For the year ended December 31, 2019, the increased balance of contracts from new orders and foreign exchange impact is ￦390,224 million and the decreased balance of contracts due to changes in scope of construction work is ￦10,955 million. (2) Accumulated earned revenue, expense and others related to the Company’s construction contracts as of December 31, 2018 and 2019 are as follows: 2018 Accumulated earned revenue Accumulated expense Accumulated profit Unearned advance receipts In millions of won Nuclear power plant construction in UAE and others ￦ 19,801,220 18,651,188 1,150,032 — 2019 Accumulated earned revenue Accumulated expense Accumulated profit Unearned advance receipts In millions of won Nuclear power plant construction in UAE and others ￦ 20,971,487 19,566,647 1,404,840 — (3) Gross amount due from customers recognized as contract assets and due to customers recognized as contract liabilities for contract work as of December 31, 2018 and 2019 are as follows: 2018 2019 Contract Contract Contract Contract In millions of won Nuclear power plant construction in UAE and others ￦ 36,232 350,460 53,827 73,420 (*1) Included in trade and other receivables, net, in the consolidated statements of financial position. The balance of receivables from construction contracts are ￦35,218 million and ￦46,489 million, as of December 31, 2018 and 2019, respectively. (*2) Included in non-financial

Intangible Assets other than Go

Intangible Assets other than Goodwill	12 Months Ended
	Dec. 31, 2019
Intangible Assets other than Goodwill [Abstract]
Intangible Assets other than Goodwill	21. Intangible Assets other than Goodwill (1) Intangible assets as of December 31, 2018 and 2019 are as follows: 2018 Acquisition Government Accumulated Accumulated Book value In millions of won Software ￦ 619,662 (420 ) (461,981 ) — 157,261 Licenses and franchises 3,398 — (3,398 ) — — Copyrights, patents rights and other industrial rights 97,033 — (29,921 ) — 67,112 Mining rights 561,945 — (27,421 ) — 534,524 Development expenditures 878,462 (2,110 ) (785,976 ) — 90,376 Intangible assets under development 83,381 (10,564 ) — (12,845 ) 59,972 Usage rights of donated assets and other 459,682 — (372,671 ) — 87,011 Leasehold rights 25,482 — (19,930 ) — 5,552 Greenhouse gas emissions rights 7,050 — — — 7,050 Others 333,621 — (104,486 ) (12,051 ) 217,084 ￦ 3,069,716 (13,094 ) (1,805,784 ) (24,896 ) 1,225,942 2019 Acquisition Government Accumulated Accumulated Book value In millions of won Software ￦ 707,731 (235 ) (542,736 ) — 164,760 Licenses and franchises 3,398 — (3,398 ) — — Copyrights, patents rights and other industrial rights 102,828 — (40,389 ) (9,178 ) 53,261 Mining rights 584,969 — (28,456 ) (512,790 ) 43,723 Development expenditures 916,834 (1,492 ) (822,972 ) (19 ) 92,351 Intangible assets under development 73,335 (11,029 ) — (12,845 ) 49,461 Usage rights of donated assets and other 582,825 — (389,664 ) — 193,161 Leasehold rights 25,989 — (20,671 ) — 5,318 Greenhouse gas emissions rights 41,656 — — — 41,656 Others 557,749 (79 ) (119,446 ) (11,939 ) 426,285 ￦ 3,597,314 (12,835 ) (1,967,732 ) (546,771 ) 1,069,976 (2) Changes in intangible assets for the years ended December 31, 2018 and 2019 are as follows: 2018 Beginning Acquisition Disposal Amortization Impairment(*) Others Ending In millions of won Software ￦ 125,891 10,861 (1 ) (53,755 ) — 74,685 157,681 (Government grants) (486 ) — — 254 — (188 ) (420 ) Copyrights, patents rights and other industrial rights 23,981 28 — (8,665 ) (13 ) 51,781 67,112 Mining rights 539,633 29,687 — (3,186 ) — (31,610 ) 534,524 Development expenditures 84,518 823 — (27,100 ) — 34,245 92,486 (Government grants) (3,702 ) — — 1,591 — 1 (2,110 ) Intangible assets under development 139,910 67,383 — — (8,912 ) (127,845 ) 70,536 (Government grants) (10,540 ) — — — 799 (823 ) (10,564 ) Usage rights of donated assets and other 101,658 — — (13,307 ) — (1,340 ) 87,011 (Government grants) (11 ) — — 11 — — — Leasehold rights 5,044 — — (667 ) — 1,175 5,552 Greenhouse gas emissions rights — — — — — 7,050 7,050 Others 181,225 1,805 (8 ) (14,114 ) (14 ) 48,190 217,084 (Government grants) — — — — — — — ￦ 1,187,121 110,587 (9 ) (118,938 ) (8,140 ) 55,321 1,225,942 (*) Includes ￦8,104 million of impairment loss on the intangible assets under development in relation to the technology development of heat transfer tube owned by KEPCO Nuclear Fuel Co., Ltd., 96.36% owned subsidiary. 2019 Beginning Acquisition Disposal Amortization Impairment(*1) Others(*2) Ending In millions of won Software ￦ 157,681 42,694 (774 ) (81,883 ) — 47,277 164,995 (Government grants) (420 ) — — 202 — (17 ) (235 ) Copyrights, patents rights and other industrial rights 67,112 171 (325 ) (9,196 ) — (4,501 ) 53,261 Mining rights 534,524 8,742 — (7,186 ) (513,519 ) 21,162 43,723 Development expenditures 92,486 687 — (28,901 ) (68 ) 29,639 93,843 (Government grants) (2,110 ) — — 833 — (215 ) (1,492 ) Intangible assets under development 70,536 56,082 — — — (66,128 ) 60,490 (Government grants) (10,564 ) — — — — (465 ) (11,029 ) Usage rights of donated assets and other 87,011 — — (15,632 ) — 121,782 193,161 (Government grants) — — — — — — — Leasehold rights 5,552 — — (741 ) — 507 5,318 Greenhouse gas emissions rights 7,050 118,743 (7,058 ) — — (77,079 ) 41,656 Others 217,084 2,307 (164 ) (14,413 ) (22 ) 221,572 426,364 (Government grants) — — — 2 — (81 ) (79 ) ￦ 1,225,942 229,426 (8,321 ) (156,915 ) (513,609 ) 293,453 1,069,976 (*1) KEPCO Australia Pty., Ltd. and KEPCO Bylong Australia Pty., Ltd., 100% owned subsidiaries, performed an impairment test over the mining rights and the Company recognized the amount of the carrying amount in excess of its recoverable amount as an impairment loss. (*2) ‘Others’ include the business rights amounting to ￦172,434 million increased from the business combination between Korea East-West Power Co., Ltd. and Eumseong Natural Gas Power Co., Ltd. (see note 51) (3) Significant specific intangible assets as of December 31, 2018 and 2019 are as follows: 2018 Type Description Currency Amount Remaining useful lives In millions of won and thousands of Australian dollars Software ERP system and others KRW 783 2 years and 2 months ~ 2 years and 4 months Electricity sales information system KRW 6,477 4 years Copyrights, patents rights and other industrial rights Smart technology verification and standard design project conducting right KRW 9,256 3 years and 9 months Contributions to ARP NRC DC KRW 46,594 9 years Mining rights Mining right of Bylong mine AUD 401,225 — (*) Development expenditures Electricity sales information system KRW 22,337 3 years and 3 months Usage rights of donated assets and others Sejong Haengbogdosi sharing charge Dangjin power plant load facility usage right KRW KRW 35,923 7 years and 11 months 2 years and 3 months Others Occupancy and use of public waters KRW 97,858 18 years and 1 month (*) Mining rights are amortized using the units-of-production 2019 Type Description Currency Amount Remaining useful lives In millions of won and thousands of Australian dollars Software ERP system and others KRW 432 1 year and 2 months ~ 1 year and 4 months Electricity sales information system KRW 4,824 3 years Copyrights, patents rights and other industrial rights Smart technology verification and standard design project conducting right KRW 6,787 2 years and 9 months Contributions to ARP NRC DC KRW 34,755 8 years Mining rights Mining right of Bylong mine AUD — — (*) Development expenditures Electricity sales information system KRW 15,283 2 years and 3 months Usage rights of donated assets and others Sejong Haengbogdosi sharing charge Dangjin power plant load facility usage right KRW KRW 31,385 7,870 6 years and 11 months 1 year and 3 months Others Occupancy and use of public waters KRW 92,446 17 years and 1 month Business rights KRW 171,955 29 years and 11 months (*) The carrying amount of mining right does not exist, because KEPCO Australia Pty., Ltd. and KEPCO Bylong Australia Pty., Ltd. recognized impairment losses in full during the year ended December 31, 2019. (4) For the years ended December 31, 2017, 2018 and 2019, the Company recognized research and development expenses of 721,437 million, 723,888 million and 735,715 million, respectively.

Trade and Other Payables

Trade and Other Payables	12 Months Ended
	Dec. 31, 2019
Trade and Other Payables [Abstract]
Trade and Other Payables	22. Trade and Other Payables Trade and other payables as of December 31, 2018 and 2019 are as follows: 2018 2019 Current Non-current Current Non-current In millions of won Trade payables ￦ 3,411,830 — 2,859,721 — Other trade payables 1,630,860 2,626,876 1,952,659 2,446,714 Accrued expenses 1,127,796 1,859 1,028,869 2,033 Leasehold deposits received 1,949 1,084 2,571 709 Other deposits received 169,317 72,453 163,382 68,702 Lease liabilities — — 635,349 4,434,784 Finance lease liabilities 57,200 226,606 — — Dividends payable 6,443 — 6,851 — Others(*) — 12,818 — 12,818 ￦ 6,405,395 2,941,696 6,649,402 6,965,760 (*) Details of others as of December 31, 2018 and 2019 are as follows: 2018 2019 Current Non-current Current Non-current In millions of won Advance received from local governments ￦ — 5,818 — 5,818 Others — 7,000 — 7,000 ￦ — 12,818 — 12,818

Borrowings and Debt Securities

Borrowings and Debt Securities	12 Months Ended
	Dec. 31, 2019
Borrowings and Debt Securities [Abstract]
Borrowings and Debt Securities	23. Borrowings and Debt Securities (1) Borrowings and debt securities as of December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Current liabilities Short-term borrowings ￦ 860,602 1,098,555 Current portion of long-term borrowings 312,994 217,579 Current portion of debt securities 6,790,778 7,545,485 Less : Current portion of discount on long-term borrowings (972 ) (1,000 ) Less : Current portion of discount on debt securities (1,974 ) (2,780 ) Add : Current portion of premium on debt securities 20 — 7,961,448 8,857,839 Non-current Long-term borrowings 3,280,015 3,411,052 Debt securities 49,905,077 55,716,183 Less : Discount on long-term borrowings (22,000 ) (21,309 ) Less : Discount on debt securities (89,913 ) (88,920 ) Add: Premium on debt securities — 1,696 53,073,179 59,018,702 ￦ 61,034,627 67,876,541 (2) Repayment schedule of borrowings and debt securities as of December 31, 2018 and 2019 are as follows: 2018 Type Borrowings Debt Securities In millions of won Less than 1 year ￦ 1,173,596 6,790,778 1~ 5 years 1,911,226 30,175,734 Over 5 years 1,368,789 19,729,343 ￦ 4,453,611 56,695,855 2019 Type Borrowings Debt Securities In millions of won Less than 1 year ￦ 1,316,134 7,545,485 1~ 5 years 2,113,404 31,552,963 Over 5 years 1,297,648 24,163,220 ￦ 4,727,186 63,261,668 (3) Short-term borrowings as of December 31, 2018 and 2019 are as follows: 2018 Type Creditor Interest rate (%) Maturity Foreign currency Local currency In millions of won and thousands of foreign currencies Local short-term KTB Investment and 2.05~2.51 2019.01.04~ 2019.02.20 — ￦ 674,000 Foreign short-term SCNT and others 4.60~6.50 2019.12.03 USD 8,955 10,013 Foreign short-term BDO Unibank 6.59 2020.12.17(*) PHP 450,000 9,581 Local bank overdraft Nonghyup Bank 2.59~3.09 2019.01.10~ 2019.12.31 — 142,773 Local bank overdraft Woori Bank Standard overdraft 2019.02.26 — 24,235 ￦ 860,602 2019 Type Creditor Interest rate (%) Maturity Foreign currency Local currency In millions of won and thousands of foreign currencies Local short-term DB financial investment and others 2.00~2.20 2020.01.13~ — ￦ 280,000 Foreign short-term LG-CNS 4.60 2020.06.30 USD 23,699 27,439 Foreign short-term BDO Unibank 3.92 2020.12.20 PHP 225,000 5,130 Foreign short-term Mizuho Bank 4.60 2020.06.30 USD 11,027 12,767 Electronic short-term Mirae asset daewoo and others 1.72~2.20 2020.01.10~ — 400,000 Local bank overdraft Korea development Bank and others 1.98~2.75 2020.01.01~ — 373,219 ￦ 1,098,555 (*) The contractual maturity is 2020 but is classified as short-term borrowing due to intention of early payment in 3 months after borrowing. (4) Long-term borrowings as of December 31, 2018 and 2019 are as follows: 2018 Type Interest rate (%) Maturity Foreign currency Local currency In millions of won and thousands of foreign currencies Local long-term borrowings Korea Development Bank Others 0.50 2019~2044 — ￦ 4,154 Facility 2.45~4.60 2023~2028 — 66,793 Operating funds 2.59~3.56 2020~2021 — 67,000 Operating funds 1yr KoFC bond 2020 — 14,000 Hana Bank Commercial Paper 3M CD+0.19~0.32 2021~2023 — 950,000 Facility 4.60 2028 — 13,781 Facility 3yr KTB rate-1.25 2019~2028 — 8,072 IBK PF Refinancing CD+1.25 2030 — 22,500 Export-Import Bank of Korea Project loans 1.50 2026 — 22,096 Operating funds 2.21 2020 — 35,000 Korea Energy Agency Development of power resources 3yr KTB rate-2.25 2023~2025 — 5,558 Facility 3yr KTB rate-2.25 2019~2024 — 2,589 Project loans — 2023 — 1,197 Others KTB rate -2.25 2024~2028 — 17,347 Shinhan Bank Collateral borrowing 2.32 2019 — 30,000 Facility CB rate+1.10 2028 — 20,672 Others 3.95 2035 — 103,851 Others Standard overdraft 2035 — 103,851 Kookmin Bank Facility 3.16 2020 — 10,000 Facility MOR+0.79 2023 — 30,333 Others Facility 1.75~4.60 2026~2036 — 168,080 Facility CB rate+1.10~1.60 2023~2036 — 52,810 PF Refinancing 4.10 2030 — 62,500 Others 4.50~7.90 2022~2039 — 102,347 1,914,531 Foreign long-term borrowings Korea Energy Agency Project loans — 2021~2023 USD 8,744 9,776 Export-Import Bank of Korea and others Direct loan and others 1M Libor+1.80~ 3.20 2036 USD 123,909 138,542 Direct loan and others 3M Libor+2.75~ 3.70 2027 JOD 158,524 249,783 Commercial loan and others 3M Libor+1.50~ 2.50 2030~2033 USD 277,538 310,315 PF Loan 6M Libor+1.70~ 2.50 2032 USD 126,798 141,773 Others 3.88 2021 USD 278,105 310,427 SCNT and others Shareholder’s loan 8.00 2031 JOD 4,853 7,647 Shareholder’s loan 6.50~8.00 2023 USD 44,680 49,956 PT PJB Shareholder’s loan 12.75 2019 IDR 5,569,304 428 Samsung Life Insurance and others Syndicated Loan 3.10 2032 JPY 5,286,835 53,565 Woori Bank and others Syndicated Loan JPY 6M Libor+2.00 2032 JPY 3,410,381 34,553 SMBC and others Equity Bridge Loan 1M Libor+0.90 2019 USD 44,019 49,218 IFC and others Others 6M Libor+5.00 2031 PKR 25,900,420 206,944 Federal Financing Bank and others PF loan 2.39~13.00 2031~2038 USD 102,322 114,406 Others Others — 2019 USD 1,025 1,145 1,678,478 3,593,009 Less : Discount on long-term borrowings (22,972 ) Less : Current portion of long-term borrowings (312,994 ) Add : Current portion of discount on long-term borrowings 972 ￦ 3,258,015 2019 Type Interest rate (%) Maturity Foreign currency Local currency In millions of won and thousands of foreign currencies Local long-term borrowings Korea Development Bank Others 0.50 2020~2044 — ￦ 3,500 Facility 2.50~4.60 2023~2028 — 59,845 Operating funds 2.33~3.04 2020~2022 — 55,000 Operating funds 1yr KoFC bond rate +0.95 2020~2022 — 24,000 Hana Bank Commercial Paper 3M CD+0.13~0.32 2021~2024 — 1,150,000 Facility 4.60 2028 — 12,466 Facility 3yr KTB rate-1.25 2020~2028 — 6,699 IBK PF Refinancing CD+1.25 2030 — 10,497 Export-Import Bank of Korea Project loans 1.50 2026 — 19,150 Operating funds 2.21 2020 — 35,000 Korea Energy Agency Development of power resources 3yr KTB rate-2.25 2023~2025 — 4,350 Facility 3yr KTB rate-2.25 2020~2024 — 2,058 Project loans — 2023 — 1,197 Others KTB rate-2.25 2024~2028 — 15,696 Shinhan Bank Facility CB rate+1.10 2028 — 18,698 Others 3.95 2035 — 99,146 Others Standard overdraft rate+1.00 2035 — 99,146 Kookmin Bank Facility 3.16 2020 — 10,000 Facility MOR+0.79 2023 — 23,333 Others Facility 1.75~6.80 2026~2036 — 390,044 Facility CB rate+1.10~1.60 Standard overdraft rate+2.45 2023~2036 — 111,834 PF Refinancing 4.10 2030 — 29,159 Others 4.50~7.90 2022~2039 — 102,348 2,283,166 Foreign long-term borrowings Korea Energy Agency Project loans — 2021~2023 USD 8,744 10,123 Export-Import Bank of Korea and others Direct loan and others 1M Libor+1.80~3.20 2036 USD 101,912 117,994 Direct loan and others 3M Libor+2.75~3.70 2027 JOD 146,380 239,039 PF Loan 6M Libor+2.50~2.70 2032 USD 118,684 137,412 Others 3.88 2021 USD 289,709 334,685 SCNT and others Shareholder’s loan 6.50~8.00 2023 USD 13,000 15,051 Shareholder’s loan 8.00 2031 JOD 4,853 7,925 Samsung Life Insurance and others Syndicated Loan 3.10 2032 JPY 4,981,038 52,972 Woori Bank and others Syndicated Loan JPY 6M Libor+2.00 2032 JPY 3,213,121 34,171 IFC and others Others 6M Libor+5.00 2031 PKR 37,252,930 278,652 Federal Financing Bank and others PF Loan 2.39~13.00 2031~2038 USD 101,380 117,377 Others Others — — USD 57 64 1,345,465 3,628,631 Less : Discount on long-term borrowings (22,309 ) Less : Current portion of long-term borrowings (217,579 ) Add : Current portion of discount on long-term borrowings 1,000 ￦ 3,389,743 (5) Local debt securities as of December 31, 2018 and 2019 are as follows: Issue date Maturity Interest 2018 2019 In millions of won Electricity Bonds 2010.04.08~ 2019.12.30 2020.01.12~ 2049.10.24 1.32~5.26 ￦ 24,480,000 28,450,000 Corporate Bonds(*) 2009.10.16~ 2019.12.19 2020.02.22~ 2049.12.19 1.29~6.00 23,223,228 24,463,577 47,703,228 52,913,577 Less : Discount on local debt securities (41,247 ) (42,274 ) Less : Current portion of local debt securities (5,330,000 ) (6,340,000 ) Add : Current portion of discount on local debt securities 1,035 1,409 ￦ 42,333,016 46,532,712 (*) Corporate bonds of HeeMang Sunlight Power Co., Ltd. amounting to ￦2,697 million can be redeemed every March 31 after five years from its issue date, March 31, 2016. (6) Foreign debt securities as of December 31, 2018 and 2019 are as follows: 2018 Type Issue date Maturity Interest rate (%) Foreign currency Local currency In millions of won and thousands of foreign currencies FY-96 1996.04.01~ 1996.12.06 2026.12.01~ 2096.04.01 6.00~8.37 USD 249,071 ￦ 278,488 FY-97 1997.01.31~ 1997.08.04 2027.02.01~ 2027.08.01 6.75~7.00 USD 314,717 351,885 FY-04 2004.04.23 2034.04.23 5.13 USD 286,920 320,805 FY-11 2011.07.13 2021.07.13 4.75 USD 500,000 559,050 FY-12 2012.09.19 2022.09.19 3.00 USD 750,000 838,575 FY-13 2013.09.26~ 2013.10.23 2019.03.26~ 2019.04.23 1.50~1.63 CHF 400,000 454,488 FY-13 2013.09.25 2020.09.25 5.75 AUD 325,000 256,038 FY-14 2014.02.11~ 2014.12.02 2019.02.11~ 2029.07.30 2.38~3.57 USD 1,500,000 1,677,150 FY-15 2015.06.15 2025.06.15 3.25 USD 300,000 335,430 FY-16 2016.01.21 2021.07.21 2.50 USD 300,000 335,430 FY-17 2017.04.12~ 2017.07.25 2020.04.12~ 2027.07.25 2.38~3.13 USD 1,100,000 1,229,910 FY-17 2017.10.30 2037.10.30 1.70 EUR 40,000 51,166 FY-17 2017.11.16 2037.11.16 2.36 SEK 450,000 56,061 FY-18 2018.01.29~ 2018.07.25 2021.01.29~ 2023.07.25 3.00~3.88 USD 1,800,000 2,012,580 FY-18 2018.03.13 2028.03.13 3.35 HKD 1,650,000 235,571 8,992,627 Less : Discount on foreign debt securities (50,640 ) Add : Premium on foreign debt securities 20 Less : Current portion of foreign debt securities (1,460,778 ) Add : Current portion of discount on foreign debt securities 939 Less: Current portion of premium on foreign debt securities (20 ) ￦ 7,482,148 2019 Type Issue date Maturity Interest rate (%) Foreign currency Local currency In millions of won and thousands of foreign currencies FY-96 1996.04.01~ 1996.12.06 2026.12.01~ 2096.04.01 6.00~7.95 USD 249,074 ￦ 288,379 FY-97 1997.01.31~ 1997.08.04 2027.02.01~ 2027.08.01 6.75~7.00 USD 314,717 364,379 FY-04 2004.04.23 2034.04.23 5.13 USD 286,920 332,196 FY-11 2011.07.13 2021.07.13 4.75 USD 500,000 578,900 FY-12 2012.09.19 2022.09.19 3.00 USD 750,000 868,350 FY-13 2013.09.25 2020.09.25 5.75 AUD 325,000 263,361 FY-14 2014.07.30~ 2014.12.02 2020.06.02~ 2029.07.30 2.50~3.57 USD 600,000 694,680 FY-15 2015.06.15 2025.06.15 3.25 USD 300,000 347,340 FY-16 2016.01.21 2021.07.21 2.50 USD 300,000 347,340 FY-17 2017.04.12~ 2017.07.25 2020.04.12~ 2027.07.25 2.38~3.13 USD 1,100,000 1,273,580 FY-17 2017.10.30 2037.10.30 1.70 EUR 40,000 51,897 FY-17 2017.11.16 2037.11.16 2.36 SEK 450,000 55,737 FY-18 2018.01.29~ 2018.07.25 2021.01.29~ 2023.07.25 3.00~3.88 USD 1,800,000 2,084,040 FY-18 2018.03.13 2028.03.13 3.35 HKD 1,650,000 245,289 FY-19 2019.01.22~ 2019.06.24 2022.01.22~ 2024.06.24 2.50~3.38 USD 800,000 926,240 FY-19 2019.02.27 2024.02.27 0.13 CHF 200,000 239,104 FY-19 2019.07.19 2024.07.19~ 2027.07.19 0~0.05 CHF 300,000 358,656 FY-19 2019.07.22 2022.07.22 2.38 USD 300,000 347,340 FY-19 2019.10.31 2024.10.30 3M BBSW+97bp AUD 300,000 243,102 FY-19 2019.12.19 2037.12.31 3.3~5.7 USD 378,460 438,181 10,348,091 Less : Discount on foreign debt securities (49,426 ) Add : Premium on foreign debt securities 1,696 Less : Current portion of foreign debt securities (1,205,485 ) Add : Current portion of discount on foreign debt securities 1,371 ￦ 9,096,247 (7) Changes in borrowings and debt securities for the years ended December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Beginning balance ￦ 54,747,392 61,034,627 Cash flow 5,972,336 6,342,074 Effect of exchange rate fluctuations 322,515 494,414 Increase from the business combination — 2,900 Others (7,616 ) 2,526 Ending balance ￦ 61,034,627 67,876,541

Leases

Leases	12 Months Ended
	Dec. 31, 2019
Presentation of leases for lessee [Abstract]
Disclosure of leases	24. Lease 1) Company as a lessee (1) Lease contracts The Company had recognized finance lease assets and liabilities only for those lease contracts classified as finance lease contracts under IAS 17 ‘Lease’. However, upon adoption of IFRS 16 ‘Lease’, the Company additionally recognized right-of-use The Company applies the short-term leases recognition exemption to its lease contracts that have a lease term of 12 months or less from the commencement date, and recognized ￦20,127 million as expense for the year ended December 31, 2019. The Company also applies the leases of low-value The Company has lease contracts for various items such as consecutive voyage charter contracts, power purchase agreements (PPA), real estate lease contracts including buildings, switchyard, and land for electric substation, vehicles, and other equipment. (2) Right-of-use 2019 Acquisition cost Government grants Accumulated depreciation Book value In millions of won Land ￦ 693,103 — (49,029 ) 644,074 Buildings 54,980 — (20,403 ) 34,577 Structures 28,198 — (2,554 ) 25,644 Machinery 1,308 — (484 ) 824 Ships 4,113,754 — (425,465 ) 3,688,289 Vehicles 20,817 — (7,109 ) 13,708 Others(*) 2,661,850 — (2,285,393 ) 376,457 ￦ 7,574,010 — (2,790,437 ) 4,783,573 (*) Including power purchase agreements (“PPA”) with GS EPS and two other LNG combined power suppliers. (3) Changes in right-of-use Beginning Changes in Increase Depreciation Ending balance In millions of won Land ￦ — 684,386 8,717 (49,029 ) 644,074 Buildings — 36,874 18,106 (20,403 ) 34,577 Structures — 20,840 7,358 (2,554 ) 25,644 Machinery — — 1,308 (484 ) 824 Ships — 3,986,947 126,807 (425,465 ) 3,688,289 Vehicles — 11,258 9,559 (7,109 ) 13,708 Others(*) — 403,346 49,141 (76,030 ) 376,457 ￦ — 5,143,651 220,996 (581,074 ) 4,783,573 (*) Including transferred amount of ￦195,704 million, which was classified as finance lease assets as of December 31, 2018. (4) Lease liabilities as of December 31, 2018 and December 31, 2019 are as follows: 2018 Minimum lease Present value of In millions of won Less than 1 year ￦ 87,709 57,200 1 ~ 5 years 228,783 170,676 More than 5 years 65,250 55,930 ￦ 381,742 283,806 2019 In millions of won Less than 1 year ￦ 686,445 1 ~ 5 years 2,334,883 More than 5 years 2,735,681 5,757,009 Less : Discount (686,876 ) Present value of lease payment ￦ 5,070,133 (5) The details of the liquidity classification of lease liabilities (Prior year : finance lease liabilities) as of December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Current lease liabilities ￦ 57,200 635,349 Non-current 226,606 4,434,784 ￦ 283,806 5,070,133 (6) Changes in lease liabilities for the years ended December 31, 2018 and 2019 are as follows: 2018 Beginning Acquisition Decrease Ending In millions of won Finance lease liabilities ￦ 418,260 — (134,454 ) 283,806 2019 Beginning Changes in Increase Decrease Interest Others(*) Ending In millions of won Lease liabilities ￦ 283,806 4,943,584 218,800 (659,387 ) 85,950 197,380 5,070,133 (*) Including translation effect of foreign currency lease liabilities and others. (7) Details of expense relating to lease contracts as lessee for the year ended December 31, 2019 are as follows: 2019 In millions of won Depreciation of right-of-use ￦ 581,074 Interest expenses of lease liabilities 85,950 Leases expenses for short-term leases 20,127 Leases expenses for leases of low-value 1,616 Variable lease payments (15,912 ) ￦ 672,855 (8) Minimum lease payment and contingent rent payment recognized as an expense as a lessee for the year ended December 31, 2018 are as follows: 2018 In millions of won Minimum lease payment ￦ 111,530 Contingent rent payment (18,872 ) ￦ 92,658 (9) The total cash outflow related to the lease contract, including cash outflows due to short-term leases and leases of low-value 665,218 million. 2) Company as a lessor (1) Finance lease contracts The Company entered into power purchase agreements (“PPA”) with Jordan Electric Power Company to provide a 373MW level Qatrana gas combined power plant over a 25-year lease term, and an 89.1MW level Fujeij wind power plant over a 20-year lease term. Also, the Company has provided fly-ash (2) Profit and loss related to finance lease: 2019 In millions of won Finance income on the net investment in the lease ￦ 97,392 (3) Maturity analysis of the lease payments receivable and reconciliation of the undiscounted lease payments to the net investment in the lease as of December 31, 2019 are as follows: 2019 In millions of won Less than 1 year ￦ 173,093 1 ~ 2 years 150,895 2 ~ 3 years 150,596 3 ~ 4 years 149,364 4 ~ 5 years 145,964 More than 5 years 1,740,652 2,510,564 Less : Unearned finance income (1,331,723 ) Net investment in the lease ￦ 1,178,841 The implicit interest rate for a lease term is determined on the lease contract date. The implicit interest rate of the finance lease contracts is from 3.5% up to 16.48% per year as of December 31, 2019. (prior year : 3.5% ~ 9.12%) (4) Finance lease receivables as of December 31,2018 are as follows: 2018 Minimum lease Present value of In millions of won Less than 1 year ￦ 124,918 84,688 1 ~ 5 years 467,518 223,622 More than 5 years 1,333,016 675,036 ￦ 1,925,452 983,346 (5) Changes in the allowance for doubtful accounts of finance lease receivables for the year ended December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Beginning balance ￦ — 1,133 Bad debt expense 1,133 — Reversal of allowance for doubtful accounts — (271 ) Ending balance ￦ 1,133 862

Employment Benefits

Employment Benefits	12 Months Ended
	Dec. 31, 2019
Employment Benefits [Abstract]
Employment Benefits	25. Employment Benefits (1) Employment benefit obligations as of December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Net defined benefit asset ￦ — (1,047 ) Net defined benefit obligations 1,638,785 1,925,134 Other long-term employee benefit obligations 6,284 4,720 ￦ 1,645,069 1,928,807 (2) Principal assumptions on actuarial valuation as of December 31, 2018 and 2019 are as follows: 2018 2019 Discount rate 2.24%~2.90% 1.92%~2.05% Future salary and benefit levels 4.88% 4.39% Weighted average duration 13.71 years 13.23 years (3) Details of expense relating to defined benefit plans for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 2018 2019 In millions of won Current service cost ￦ 392,820 369,899 440,300 Interest cost 79,524 87,687 83,619 Expected return on plan assets (31,307 ) (42,135 ) (41,597 ) Past service cost — — 301,442 Loss from settlement (1,055 ) (767 ) (2,017 ) ￦ 439,982 414,684 781,747 Expenses as described above are recognized in those items below in the financial statements. 2017 2018 2019 In millions of won Cost of sales ￦ 332,249 308,672 580,623 Selling and administrative expenses 59,111 51,903 120,455 Others (Construction-in-progress 48,622 54,109 80,669 ￦ 439,982 414,684 781,747 In addition, for the years ended December 31, 2017, 2018 and 2019, employee benefit obligations expenses of ￦65,603 million, ￦66,833 million and ￦71,844 million, respectively, are recognized as cost of sales, and ￦11,983 million, ￦13,204 million and ￦12,775 million, respectively, are recognized as selling and administrative expenses, and ￦13,332 million, ￦14,189 million and ￦13,893 million, respectively, are recognized as construction-in-progress (4) Details of defined benefit obligations as of December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Present value of defined benefit obligation from funded plans ￦ 3,414,116 4,035,400 Fair value of plan assets (1,775,331 ) (2,111,313 ) 1,638,785 1,924,087 Present value of defined benefit obligation from unfunded plans — — Net liabilities incurred from defined benefit plans ￦ 1,638,785 1,924,087 (5) Changes in the present value of defined benefit obligations for the years ended December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Beginning balance ￦ 2,951,842 3,414,116 Current service cost 369,899 440,300 Interest cost(*) 87,687 83,619 Remeasurement component 154,939 (93,736 ) Past service cost — 301,442 Loss from settlement (767 ) (2,018 ) Actual payments (149,454 ) (108,057 ) Others (30 ) (266 ) Ending balance ￦ 3,414,116 4,035,400 (*) Corporate bond (AAA rated) yield at year-end (6) Changes in the fair value of plan assets for the years ended December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Beginning balance ￦ 1,475,641 1,775,331 Expected return 42,135 41,597 Remeasurement component (12,308 ) (11,186 ) Contributions by the employers 330,064 348,386 Actual payments (60,201 ) (42,815 ) Ending balance ￦ 1,775,331 2,111,313 In addition, loss on accumulated remeasurement component amounting to ￦219,381 million and ￦117,779 million has been recognized as other comprehensive income or loss for the years ended December 31, 2018 and 2019, respectively. (7) Details of the fair value of plan assets as of December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Equity instruments ￦ 96,823 189,235 Debt instruments 510,184 648,265 Bank deposit 275,518 199,743 Others 892,806 1,074,070 ￦ 1,775,331 2,111,313 For the years ended December 31, 2018 and 2019, actual returns on plan assets amounted to ￦29,827 million and ￦30,411 million, respectively. (8) Remeasurement component recognized in other comprehensive income (loss) for the years ended December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Actuarial gain from changes in financial assumptions ￦ 186,428 (2,916 ) Experience adjustments, etc. (31,489 ) (90,820 ) Expected return 12,308 11,186 ￦ 167,247 (82,550 ) Remeasurement component recognized as other comprehensive income or loss is recorded in retained earnings.

Provisions

Provisions	12 Months Ended
	Dec. 31, 2019
Provisions [Abstract]
Provisions	26. Provisions (1) Provisions as of December 31, 2018 and 2019 are as follows: 2018 2019 Current Non-current Current Non-current In millions of won Employment benefits Provisions for employment benefits ￦ 976,347 — 975,619 — Litigation Litigation provisions 40,157 37,636 39,177 49,221 Decommissioning cost Nuclear plants — 13,388,134 — 15,994,039 Spent fuel — 1,291,354 401,741 953,539 Radioactive waste 4,310 1,680,698 77,053 1,811,029 PCBs — 147,668 — 152,981 Other recovery provisions — 10,477 — 10,773 Others Power plant regional support program 137,668 — 140,133 — Transmission regional support program 151,698 — 139,785 — Provisions for tax 6,845 — — — Provisions for financial guarantee 1,320 14,266 111 81,246 Provisions for RPS 93,919 — 2,889 — Provisions for greenhouse gas emissions obligations 136,187 — 682,459 — Others 46,347 15,515 145,754 13,220 ￦ 1,594,798 16,585,748 2,604,721 19,066,048 (2) Changes in provisions for the years ended December 31, 2018 and 2019 are as follows: 2018 Beginning Increase in Payment Reversal Others Ending balance In millions of won Employment benefits Provisions for employment benefits ￦ 913,787 912,440 (843,281 ) (6,599 ) — 976,347 Litigation Litigation provisions(*) 73,576 234,517 (216,187 ) (13,847 ) (266 ) 77,793 Decommissioning cost Nuclear plants 13,007,228 411,316 (30,410 ) — — 13,388,134 Spent fuel 1,339,046 435,007 (482,699 ) — — 1,291,354 Radioactive waste 1,638,371 112,815 (66,178 ) — — 1,685,008 PCBs 180,087 4,600 (13,758 ) (23,261 ) — 147,668 Other recovery provisions 6,659 2,125 — — 1,693 10,477 Others Power plant regional support program 153,756 46,366 (71,978 ) — 9,524 137,668 Transmission regional support program 243,365 141,661 (233,328 ) — — 151,698 Provisions for tax 61 6,821 — — (37 ) 6,845 Provisions for financial guarantee 23,475 1,179 (67 ) (8,432 ) (569 ) 15,586 Provisions for RPS 271,624 297,802 (475,507 ) — — 93,919 Provisions for greenhouse gas emissions obligations 414,252 131,860 (350,356 ) (59,569 ) — 136,187 Others 96,925 44,732 (82,632 ) (745 ) 3,582 61,862 ￦ 18,362,212 2,783,241 (2,866,381 ) (112,453 ) 13,927 18,180,546 (*) As described in Note 50.(1), the Company believes that the possibility of economic benefit outflow is probable on the request for additional construction costs of Hyundai E&C, GS Engineering & Construction Corp. and Hansol SeenTec Co., Ltd. For this reason, the Company recognized ￦204,787 million of provision in addition to property, plant and equipment. 2019 Beginning Increase in Payment Reversal Others Ending balance In millions of won Employment benefits Provisions for employment benefits ￦ 976,347 900,033 (879,980 ) (20,781 ) — 975,619 Litigation Litigation provisions 77,793 59,366 (17,236 ) (31,525 ) — 88,398 Decommissioning cost Nuclear plants 13,388,134 2,639,562 (33,657 ) — — 15,994,039 Spent fuel 1,291,354 440,029 (376,103 ) — — 1,355,280 Radioactive waste 1,685,008 209,551 (6,787 ) — 310 1,888,082 PCBs 147,668 14,251 (8,938 ) — — 152,981 Other recovery provisions 10,477 2,020 (2,033 ) — 309 10,773 Others Power plant regional support program 137,668 41,341 (48,390 ) — 9,514 140,133 Transmission regional support program 151,698 169,616 (181,529 ) — — 139,785 Provisions for tax 6,845 — — (6,847 ) 2 — Provisions for financial guarantee 15,586 83,910 (16,589 ) (1,551 ) 1 81,357 Provisions for RPS 93,919 222,119 (313,149 ) — — 2,889 Provisions for greenhouse gas emissions obligations 136,187 724,002 (152,463 ) (25,267 ) — 682,459 Others 61,862 113,751 (16,217 ) (833 ) 411 158,974 ￦ 18,180,546 5,619,551 (2,053,071 ) (86,804 ) 10,547 21,670,769

Government Grants

Government Grants	12 Months Ended
	Dec. 31, 2019
Government grants [Abstract]
Government Grants	27. Government Grants (1) Government grants as of December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Land ￦ (21,968 ) (21,817 ) Buildings (63,189 ) (61,920 ) Structures (190,854 ) (186,554 ) Machinery (173,242 ) (158,907 ) Vehicles (4,220 ) (2,275 ) Equipment (418 ) (241 ) Tools (675 ) (403 ) Construction-in-progress (54,740 ) (61,211 ) Finance lease assets (26 ) — Investment properties (50 ) (13 ) Software (420 ) (235 ) Development expenditures (2,110 ) (1,492 ) Intangible assets under development (10,564 ) (11,029 ) Other intangible assets other than goodwill — (79 ) ￦ (522,476 ) (506,176 ) (2) Changes in government grants for the years ended December 31, 2018 and 2019 are as follows: 2018 Beginning Receipt Acquisition Offset the Disposal Others Ending In millions of won Cash ￦ — (30,416 ) — — — 30,416 — Land (21,968 ) — — — — — (21,968 ) Buildings (63,539 ) — — 6,836 31 (6,517 ) (63,189 ) Structures (196,414 ) — — 10,292 3,270 (8,002 ) (190,854 ) Machinery (183,188 ) — — 18,099 823 (8,976 ) (173,242 ) Vehicles (6,322 ) — — 2,146 — (44 ) (4,220 ) Equipment (761 ) — — 365 — (22 ) (418 ) Tools (1,027 ) — — 432 — (80 ) (675 ) Construction-in-progress (49,084 ) — 18,239 — — (23,895 ) (54,740 ) Finance lease assets (27 ) — — 1 — — (26 ) Investment properties (83 ) — — 1 — 32 (50 ) Software (486 ) — — 254 — (188 ) (420 ) Development expenditures (3,702 ) — — 1,591 — 1 (2,110 ) Intangible assets under development (10,540 ) — — — — (24 ) (10,564 ) Usage rights of donated assets and other (11 ) — — 11 — — — ￦ (537,152 ) (30,416 ) 18,239 40,028 4,124 (17,299 ) (522,476 ) 2019 Beginning Receipt Acquisition Offset the Disposal Others Ending In millions of won Cash ￦ — (21,705 ) — — — 21,705 — Land (21,968 ) — — — 151 — (21,817 ) Buildings (63,189 ) — — 6,214 — (4,945 ) (61,920 ) Structures (190,854 ) — — 9,373 2,405 (7,478 ) (186,554 ) Machinery (173,242 ) — — 17,993 635 (4,293 ) (158,907 ) Vehicles (4,220 ) — — 2,170 5 (230 ) (2,275 ) Equipment (418 ) — — 262 — (85 ) (241 ) Tools (675 ) — — 281 — (9 ) (403 ) Construction-in-progress (54,740 ) — 12,338 — — (18,809 ) (61,211 ) Finance lease assets (26 ) — — — — 26 — Investment properties (50 ) — — 1 — 36 (13 ) Software (420 ) — — 202 — (17 ) (235 ) Development expenditures (2,110 ) — — 833 — (215 ) (1,492 ) Intangible assets under development (10,564 ) — — — — (465 ) (11,029 ) Others — — — 2 — (81 ) (79 ) ￦ (522,476 ) (21,705 ) 12,338 37,331 3,196 (14,860 ) (506,176 )

Deferred Revenues

Deferred Revenues	12 Months Ended
	Dec. 31, 2019
Deferred Revenues [Abstract]
Deferred Revenues	28. Deferred Revenues Deferred revenue for the years ended December 31, 2018 and 2019 are as follows which included in current and non-current non-financial 2018 2019 In millions of won Beginning balance ￦ 8,325,181 8,606,563 Increase during the current year 875,930 1,199,783 Recognized as revenue during the current year (594,548 ) (604,808 ) Ending balance ￦ 8,606,563 9,201,538

Non-financial Liabilities

Non-financial Liabilities	12 Months Ended
	Dec. 31, 2019
Other Liabilities Disclosure [Abstract]
Non-financial Liabilities	29. Non-financial Non-financial 2018 2019 Current Non-current Current Non-current In millions of won Advance received ￦ 3,724,238 80,937 3,825,240 192,863 Unearned revenue 63,038 4,690 30,988 6,589 Deferred revenue 556,072 8,050,491 590,928 8,610,610 Withholdings 172,454 10,856 160,977 10,901 Others 1,058,239 13,059 1,080,220 13,489 ￦ 5,574,041 8,160,033 5,688,353 8,834,452

Contributed Capital

Contributed Capital	12 Months Ended
	Dec. 31, 2019
Disclosure of classes of share capital [Abstract]
Contributed Capital	30. Contributed Capital (1) Details of shares issued as of December 31, 2018 and 2019 are as follows: 2018 Shares authorized Shares issued Par value per share (in won) Owned by Owned by Total In millions of won except share information Common shares 1,200,000,000 641,964,077 ￦ 5,000 1,640,385 1,569,435 3,209,820 (*) Korea Development Bank’s interest of ￦1,056,176 million is included. 2019 Shares authorized Shares issued Par value per share (in won) Owned by Owned by Total In millions of won except share information Common shares 1,200,000,000 641,964,077 ￦ 5,000 1,640,385 1,569,435 3,209,820 (*) Korea Development Bank’s interest of ￦1,056,176 million is included. (2) Details in number of outstanding capital stock for the years ended December 31, 2018 and 2019 are as follows. 2018 2019 Number of shares Beginning balance 641,964,077 641,964,077 Ending balance 641,964,077 641,964,077 (3) Details of share premium as of December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Share premium ￦ 843,758 843,758

Retained Earnings and Dividends

Retained Earnings and Dividends Paid	12 Months Ended
	Dec. 31, 2019
Disclosure of Retained Earnings and Dividends Paid [Abstract]
Retained Earnings and Dividends Paid	31. Retained Earnings and Dividends Paid (1) Details of retained earnings as of December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Legal reserve(*) ￦ 1,604,910 1,604,910 Voluntary reserves 35,906,267 34,785,425 Retained earnings before appropriations 14,007,942 12,811,798 Retained earnings ￦ 51,519,119 49,202,133 (*) The KEPCO Act requires KEPCO to appropriate a legal reserve equal to at least 20 percent of net income for each accounting period until the reserve equals 50 percent of KEPCO’s common stock. The legal reserve is not available for cash dividends; however, this reserve may be credited to paid-in (2) Details of voluntary reserves as of December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Reserve for investment on social overhead capital ￦ 5,277,449 5,277,449 Reserve for research and human development(*) 330,000 330,000 Reserve for business expansion 30,088,818 28,967,976 Reserve for equalizing dividends 210,000 210,000 ￦ 35,906,267 34,785,425 (*) The reserve for research and human development is appropriated by KEPCO to use as qualified tax credits to reduce corporate tax liabilities. The reserve is available for cash dividends for a certain period as defined by the Restriction of Special Taxation Act of Korea. (3) Changes in retained earnings for the years ended December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Beginning balance ￦ 53,370,558 51,519,119 Effect of change in accounting policy 71,928 — Net profit (loss) for the period attributed to owner of the Company (1,314,567 ) (2,345,517 ) Changes in equity method retained earnings (1,153 ) (6,789 ) Remeasurements of defined benefit liability, net of tax (100,495 ) 36,160 Transfer of gain (loss) on valuation of financial assets through other comprehensive income — (840 ) Dividends paid (507,152 ) — Ending balance ￦ 51,519,119 49,202,133 (4) Dividends paid for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 In millions of won Number of shares issued Number of treasury stocks Number of shares eligible for dividends Dividends paid per share Dividends paid (In won) Common shares 641,964,077 — 641,964,077 ￦ 1,980 1,271,089 2018 In millions of won Number of shares issued Number of treasury stocks Number of shares eligible for dividends Dividends paid per share Dividends paid (In won) Common shares 641,964,077 — 641,964,077 ￦ 790 507,152 2019 In millions of won Number of shares issued Number of treasury stocks Number of shares eligible for dividends Dividends paid per share Dividends paid (In won) Common shares 641,964,077 — 641,964,077 ￦ — — (5) Changes in retained earnings of investments in associates and joint ventures for the years ended December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Beginning balance ￦ 5,122 3,969 Changes (1,153 ) (6,789 ) Ending balance ￦ 3,969 (2,820 ) (6) Changes in remeasurement components for the years ended December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Beginning balance ￦ (43,513 ) (219,381 ) Changes (154,198 ) 76,395 Income tax effect 53,703 (40,235 ) Transfer to reserve for business expansion (75,373 ) 65,442 Ending balance ￦ (219,381 ) (117,779 )

Statement of Appropriation of R

Statement of Appropriation of Retained Earnings	12 Months Ended
	Dec. 31, 2019
Statement of Appropriation of Retained Earnings [Abstract]
Statement of Appropriation of Retained Earnings	32. Statement of Disposition of Deficit For the year ended December 31, 2018, KEPCO’s retained earnings were appropriated on March 22, 2019. For the year ended December 31, 2019, KEPCO’s deficits were appropriated on March 27, 2020. Statements of disposition of deficit and appropriation of retained earnings of KEPCO, the controlling company, for the years ended December 31, 2018 and 2019, respectively, are as follows: 2018 2019 In millions of won except for I.   Retained earnings before appropriations (undisposed deficit) Unappropriated retained earnings carried over from prior years ￦ — — Effect of change in accounting policy 39,813 — Net income (loss) (1,095,213 ) (2,594,957 ) Remeasurements of the defined benefit plan (65,442 ) (11,402 ) (1,120,842 ) (2,606,359 ) II. Transfer from voluntary reserves 1,120,842 2,606,359 III.  Subtotal (I+II) — — IV.  Appropriations of retained earnings — — V. Unappropriated retained earnings to be carried over forward to subsequent year — —

Hybrid Bonds

Hybrid Bonds	12 Months Ended
	Dec. 31, 2019
Hybrid Bonds [Abstract]
Hybrid Bonds	33. Hybrid Bonds Hybrid bonds classified as equity (non-controlling Issuer Hybrid bond Issued date Maturity Yield (%) 2018 2019 In millions of won Korea South-East Power Co., Ltd. 1st hybrid bond 2012.12.07 2042.12.06 4.38 ￦ 170,000 170,000 Korea South-East Power Co., Ltd. 2nd hybrid bond 2012.12.07 2042.12.06 4.44 230,000 230,000 Expense of issuance (1,090 ) (1,090 ) ￦ 398,910 398,910 Although these instruments have contractual maturity dates, the contractual agreements allow these subsidiaries to indefinitely extend the maturity dates and defer the payment of interest without modification to the other terms of the instruments. When the Company decides not to pay dividends on ordinary shares, they are not required to pay interest on the hybrid bonds. Substantially, as these instruments have no contractual obligation to pay principal and interest, these instruments have been classified as equity (non-controlling

Other Components of Equity

Other Components of Equity	12 Months Ended
	Dec. 31, 2019
Other Components of Equity [Abstract]
Other Components of Equity	34. Other Components of Equity (1) Other components of equity of the parent as of December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Other capital surplus ￦ 1,234,825 1,226,364 Accumulated other comprehensive loss (358,570 ) (280,730 ) Other equity 13,294,973 13,294,973 ￦ 14,171,228 14,240,607 (2) Changes in other capital surplus for the years ended December 31, 2018 and 2019 are as follows: 2018 2019 Gains on treasury stocks Others Subtotal Gains on disposal of treasury stocks Others Subtotal In millions of won Beginning balance ￦ 387,524 846,269 1,233,793 387,524 847,301 1,234,825 Issuance of share capital of subsidiary — 1,032 1,032 — — — Others — — — — (8,461 ) (8,461 ) Ending balance ￦ 387,524 847,301 1,234,825 387,524 838,840 1,226,364 (3) Changes in accumulated other comprehensive income (loss) for the years ended December 31, 2018 and 2019 are as follows: 2018 Financial asset at fair value through other comprehensive income valuation reserve Shares in other income of investments in associates and Reserve for overseas translation credit Reserve for gain (loss) on derivatives Total In millions of won Beginning balance ￦ 29,268 66,464 (318,159 ) (49,030 ) (271,457 ) Effect of change in accounting Policy (76,851 ) — — — (76,851 ) Changes in the unrealized fair value of financial assets at FVOCI, net of tax (34,125 ) — — — (34,125 ) Shares in other comprehensive income of associates and joint ventures, net of tax — 57,089 — — 57,089 Foreign currency translation of foreign operations, net of tax — — (32,086 ) — (32,086 ) Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax — — — (1,140 ) (1,140 ) Ending balance ￦ (81,708 ) 123,553 (350,245 ) (50,170 ) (358,570 ) 2019 Financial asset at fair value through other comprehensive income valuation reserve Shares in other income of investments in associates and Reserve for overseas translation credit Reserve for gain (loss) on derivatives Total In millions of won Beginning balance ￦ (81,708 ) 123,553 (350,245 ) (50,170 ) (358,570 ) Changes in the unrealized fair value of financial assets at FVOCI, net of tax (10,891 ) — — — (10,891 ) Shares in other comprehensive income of associates and joint ventures, net of tax — 19,343 — — 19,343 Foreign currency translation of foreign operations, net of tax — — 55,347 — 55,347 Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax — — — 14,041 14,041 Ending balance ￦ (92,599 ) 142,896 (294,898 ) (36,129 ) (280,730 ) (4) Details of changes in other equity for the years ended December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Statutory revaluation reserve ￦ 13,295,098 13,295,098 Changes in other equity (125 ) (125 ) ￦ 13,294,973 13,294,973

Sales

Sales	12 Months Ended
	Dec. 31, 2019
Revenue [Abstract]
Sales	35. Sales Details of sales for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 2018 2019 Domestic Overseas Domestic Overseas Domestic Overseas In millions of won [Type of goods and services] Sales of goods ￦ 55,373,316 399,232 57,514,866 382,938 56,609,330 285,546 Electricity 54,649,882 — 56,842,011 — 55,939,001 — Heat supply 205,838 — 216,117 — 220,948 — Others 517,596 399,232 456,738 382,938 449,381 285,546 Sales related to rendering of services 186,990 164,167 176,539 216,328 222,106 186,184 Sales of construction services 92,501 3,119,683 108,586 1,633,805 110,692 1,154,224 ￦ 55,652,807 3,683,082 57,799,991 2,233,071 56,942,128 1,625,954 [Timing of revenue recognition] Performance obligations satisfied at a point in time ￦ 55,373,316 399,232 57,514,866 382,938 56,609,330 285,546 Performance obligations satisfied over time 279,491 3,283,850 285,125 1,850,133 332,798 1,340,408 ￦ 55,652,807 3,683,082 57,799,991 2,233,071 56,942,128 1,625,954

Selling and Administrative Expe

Selling and Administrative Expenses	12 Months Ended
	Dec. 31, 2019
Selling, general and administrative expense [Abstract]
Selling and Administrative Expenses	36. Selling and Administrative Expenses (1) Selling and administrative expenses for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 2018 2019 In millions of won Salaries ￦ 735,383 757,819 775,204 Retirement benefit expense 71,094 65,107 157,272 Welfare and benefit expense 179,406 132,089 120,463 Insurance expense 15,414 12,181 12,427 Depreciation 190,245 214,499 232,510 Amortization of intangible assets 44,990 54,153 76,547 Bad debt expense 126,714 39,784 (12,719 ) Commission 673,740 714,096 632,849 Advertising expense 114,519 30,894 34,453 Training expense 7,027 6,277 7,174 Vehicle maintenance expense 9,998 10,148 9,525 Publishing expense 3,672 3,307 3,414 Business promotion expense 3,700 2,785 3,038 Rent expense 38,380 42,851 40,505 Telecommunication expense 24,916 23,505 8,451 Transportation expense 495 686 865 Taxes and dues 48,395 46,424 58,666 Expendable supplies expense 7,731 6,166 6,682 Water, light and heating expense 10,545 12,629 11,867 Repairs and maintenance expense 63,477 62,580 88,576 Ordinary development expense 211,417 215,494 224,463 Travel expense 16,658 14,363 15,652 Clothing expense 8,410 10,108 9,369 Survey and analysis expense 698 705 848 Membership fee 1,122 1,043 969 Others 154,709 148,197 150,506 ￦ 2,762,855 2,627,890 2,669,576 (2) Other selling and administrative expenses for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 2018 2019 In millions of won Accommodation development expenses ￦ 55,799 52,822 53,945 Miscellaneous wages 32,300 32,447 39,794 Litigation and filing expenses 11,881 12,853 21,768 Compensation for damages 12,297 19,193 (1,924 ) Outsourcing expenses 2,647 3,036 3,293 Reward expenses 2,786 2,713 2,858 Overseas market development expenses 1,876 1,361 1,997 Others 35,123 23,772 28,775 ￦ 154,709 148,197 150,506

Other Income and Expense

Other Income and Expense	12 Months Ended
	Dec. 31, 2019
Disclosure of other operating income (expense) [Abstract]
Other Income and Expense	37. Other Income and Expenses (1) Other income for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 2018 2019 In millions of won Reversal of other provisions ￦ 35,265 12,700 16,542 Reversal of other allowance for doubtful accounts 2,166 143 — Gains on government grants 430 482 281 Gains on assets contributed 4,218 17,336 6,921 Gains on liabilities exempted 3,166 10,303 916 Compensation and reparations revenue 89,196 89,901 113,292 Revenue from research contracts 12,580 6,818 5,276 Income related to transfer of assets from customers 478,973 594,548 604,808 Rental income 192,136 186,631 191,088 Others 50,988 51,032 58,849 ￦ 869,118 969,894 997,973 (2) Details of “others” included in other income for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 2018 2019 In millions of won Refund of claim for rectification ￦ 9,655 8,933 1,969 Adjustment of research project 3,884 2,267 3,294 Maintenance expenses on lease building 135 176 153 Training expenses 3,045 3,220 3,167 Deposit redemption 34 7 436 Reversal of expenses on litigation 360 753 9,926 Revenue on royalty fee 2,888 6,909 — Reimbursement of insurance fee 1,498 7,145 610 Gains on guarantee contracts 456 39 135 Others 29,033 21,583 39,159 ￦ 50,988 51,032 58,849 (3) Other expenses for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 2018 2019 In millions of won Compensation and indemnification expense ￦ 37 23,437 403 Accretion expenses of other provisions 7,535 41,924 7,939 Depreciation expenses on investment properties 1,176 923 5,069 Depreciation expenses on idle assets 6,644 6,547 6,542 Other bad debt expense 1,778 17,827 29,348 Donations 119,421 63,743 64,752 Others 43,464 76,929 127,860 ￦ 180,055 231,330 241,913 (4) Details of “others” included in other expenses for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 2018 2019 In millions of won Operating expenses related to the idle assets ￦ 136 47 49 Research grants 1,180 461 399 Supporting expenses on farming and fishing village 11,956 13,537 13,991 Operating expenses on fitness center 3,498 4,788 5,234 Expenses on adjustment of research and development grants 806 404 554 Taxes and dues 2,270 199 188 Expenses on R&D supporting 5,459 53 67 Others 18,159 57,440 107,378 ￦ 43,464 76,929 127,860

Other Gains (Losses)

Other Gains (Losses)	12 Months Ended
	Dec. 31, 2019
Other Gains (Losses) [Abstract]
Other Gains (Losses)	38. Other Gains (Losses) (1) Composition of other gains (losses) for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 2018 2019 In millions of won Other gains Gains on disposal of property, plant, and equipment ￦ 48,316 98,077 43,784 Gains on disposal of intangible assets 564 12 206 Reversal of impairment loss on property, plant and equipment — — 16,692 Reversal of impairment loss on intangible assets 54 17 — Gains on foreign currency translation 20,485 14,905 16,340 Gains on foreign currency transaction 93,151 47,297 53,152 Gains on insurance proceeds 400 — 17,410 Others 269,562 221,556 238,688 Other losses Losses on disposal of property, plant and equipment (70,514 ) (60,704 ) (72,508 ) Losses on disposal of intangible assets (183 ) (43 ) (827 ) Impairment loss on property, plant and equipment (51,067 ) (710,162 ) (50,034 ) Impairment loss on intangible assets (20 ) (8,112 ) (513,609 ) Impairment loss on other non-current — (87,024 ) (49,620 ) Losses on foreign currency translation (25,495 ) (7,678 ) (8,757 ) Losses on foreign currency transaction (36,241 ) (65,366 ) (55,283 ) Others (92,385 ) (63,899 ) (217,892 ) ￦ 156,627 (621,124 ) (582,258 ) (2) Details of “others” included in other gains for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 2018 2019 In millions of won Gains on disposal of inventories ￦ 6,024 6,350 3,424 Gains on proxy collection of TV license fee 39,711 40,450 41,013 Gains on compensation of impaired electric poles 1,526 1,166 1,372 Gains on compensation for infringement on contract 18,990 3,648 — Gains on harbor facilities dues 3,025 3,803 3,741 Gains on technical fees 2,105 2,026 3,044 Reversal of occupation development training fees 1,697 1,602 1,472 Gains on disposal of waste 4,261 4,232 5,317 Gains on insurance 10,410 22,382 812 Gains on tax rebate 2,161 542 341 Gains on other commission 4,790 4,347 1,111 Gains on disposal of assets held-for-sale — — 23,778 Others 174,862 131,008 153,263 ￦ 269,562 221,556 238,688 (3) Details of “others” included in other losses for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 2018 2019 In millions of won Losses on valuation of inventories ￦ 3,875 1,953 3,127 Losses on disposal of inventories 3,273 3,555 10,456 Losses due to disaster 5,374 2,129 7,635 Losses on rounding adjustment of electric charge surtax 1,253 1,265 1,268 Losses on adjustments of levies 1 — — Forfeit of taxes and dues 656 — — Others 77,953 54,997 195,406 ￦ 92,385 63,899 217,892

Finance Income

Finance Income	12 Months Ended
	Dec. 31, 2019
Finance income [Abstract]
Finance Income	39. Finance Income (1) Finance income for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 2018 2019 In millions of won Interest income ￦ 206,143 223,767 268,118 Dividends income 11,477 12,777 13,838 Gains on disposal of financial assets 1,130 1,838 3,866 Gains on valuation of financial assets at fair value through profit or loss 12 8,495 5,575 Gains on valuation of derivatives 16,165 199,943 362,735 Gains on transaction of derivatives 29,257 179,745 157,961 Gains on foreign currency translation 1,115,832 143,254 175,839 Gains on foreign currency transactions 150,602 27,051 21,774 ￦ 1,530,618 796,870 1,009,706 (2) Details of interest income included in finance income for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 2018 2019 In millions of won Cash and cash equivalents ￦ 35,474 40,704 42,861 Financial assets at fair value through profit or loss 290 21,713 29,411 Financial assets at amortized cost — 89 539 Held-to-maturity 82 — — Loans 30,014 21,925 63,448 Short-term financial instrument 29,412 41,025 49,070 Long-term financial instrument 8,144 7,920 12,794 Other financial assets — 1 54 Trade and other receivables 102,727 90,390 69,941 ￦ 206,143 223,767 268,118

Finance Expenses

Finance Expenses	12 Months Ended
	Dec. 31, 2019
Finance Expenses [Abstract]
Finance Expenses	40. Finance Expenses (1) Finance expenses for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 2018 2019 In millions of won Interest expense ￦ 1,789,552 1,868,458 2,046,811 Losses on sale of financial assets 2,343 1 2,106 Losses on valuation of financial assets at fair value through profit or loss — 6,616 4,513 Impairment of available-for-sale 2,713 — — Losses on valuation of derivatives 890,832 46,740 45,385 Losses on transaction of derivatives 198,218 32,448 71,546 Losses on foreign currency translation 207,944 393,859 553,731 Losses on foreign currency transaction 35,175 121,763 55,509 Losses on repayment of financial liabilities 5 — — Other 1,170 858 2,555 ￦ 3,127,952 2,470,743 2,782,156 (2) Details of interest expense included in finance expenses for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 2018 2019 In millions of won Trade and other payables ￦ 57,160 42,830 94,019 Short-term borrowings 35,891 32,545 42,971 Long-term borrowings 87,011 92,243 119,806 Debt securities 1,698,232 1,771,544 1,827,511 Other financial liabilities 491,665 505,112 558,464 2,369,959 2,444,274 2,642,771 Less: Capitalized borrowing costs (580,407 ) (575,816 ) (595,960 ) ￦ 1,789,552 1,868,458 2,046,811 Capitalization rates for the years ended December 31, 2017, 2018 and 2019 are 2.30%~3.60%, 2.17%~3.86% and 2.37%~3.44%, respectively.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2019
Income tax expense (benefit) [Abstract]
Income Taxes	41. Income Taxes (1) Income tax expense (benefit) for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 2018 2019 In millions of won Current income tax expense Payment of income tax ￦ 881,583 378,715 538,223 Adjustment in respect of prior years due to change in estimate 4,484 (195,648 ) (176,441 ) Current income tax directly recognized in equity (56,098 ) 101,528 (53,302 ) Effect of change in accounting policy — 1,780 — 829,969 286,375 308,480 Deferred tax expense Generation and realization of temporary differences 1,283,012 (495,658 ) (636,984 ) Changes of unrecognized tax losses, tax credit and temporary differences for prior periods 44,573 (28,509 ) (22,469 ) Changes in deferred tax on tax losses carryforwards — (572,305 ) (582,011 ) Tax credit carryforwards 15,270 (16,224 ) (71,306 ) Amount due to change in tax rate or regulations — — 1,987 1,342,855 (1,112,696 ) (1,310,783 ) Income tax expense (benefit) ￦ 2,172,824 (826,321 ) (1,002,303 ) (2) Reconciliation between actual income tax expense and amount computed by applying the statutory tax rate to income before income taxes for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 2018 2019 In millions of won Profit (loss) before income tax ￦ 3,614,218 (2,000,819 ) (3,265,838 ) Income tax expense (benefit) computed at applicable tax rate(*1) 874,641 (550,225 ) (898,105 ) Adjustments Effect of applying gradual tax rate (5,082 ) (1,408 ) 10,362 Effect of non-taxable (32,032 ) (1,705 ) (9,990 ) Effect of non-deductible 15,032 40,151 12,197 Effect of tax losses that are not recognized as deferred tax asset — 2,086 57,490 Effects of tax credits and deduction (161,069 ) (39,471 ) (76,983 ) Recognition (reversal) of unrecognized deferred tax asset, net 44,573 (28,509 ) (22,469 ) Effect of change in deferred tax due to change in tax rate 1,055,154 261 16,848 Deferred tax related to investments in subsidiaries and associates 394,145 (52,618 ) 147,598 Others, net (17,022 ) 765 (62,810 ) 1,293,699 (80,448 ) 72,243 Adjustment in respect of prior years due to change in estimate 4,484 (195,648 ) (176,440 ) Income tax expense (benefit) ￦ 2,172,824 (826,321 ) (1,002,302 ) Effective tax rate 60 % (*2 ) (*2 ) (*1) Applicable tax rate is 24.2% as of December 31, 2017, and 27.5% as of December 31, 2018 and 2019. (*2) The effective tax rate for the year ended December 31, 2018 and 2019 is not calculated for income tax benefit. (3) Income tax directly adjusted to shareholders’ equity (except for accumulated other comprehensive income (loss)) for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 2018 2019 In millions of won Dividends of hybrid bond ￦ 5,248 4,273 3,432 Effect of change in effective tax rate (25 ) — — ￦ 5,223 4,273 3,432 (4) Income tax recognized as other comprehensive income (loss) for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 2018 2019 In millions of won Income tax recognized as other comprehensive income (loss) Gain (loss) on valuation of financial assets at fair value through other comprehensive income ￦ — 35,798 (4,217 ) Loss on valuation of available-for-sale (2,551 ) — — Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax (11,016 ) 6,639 (15,642 ) Remeasurement of defined benefit obligations (80,645 ) 53,703 (40,235 ) Investments in associates 8,649 6,592 4,275 Others 24,242 (5,477 ) (914 ) ￦ (61,321 ) 97,255 (56,733 ) (5) Changes in deferred tax assets (liabilities) recognized in the statements of financial position for the years ended December 31, 2018 and 2019 are as follows: 2018 Beginning balance Amounts Amount Amounts recognized directly in equity Ending balance In millions of won Deferred tax on temporary differences Employee benefits ￦ 498,694 42,144 53,703 — 594,541 Cash flow hedge 65,445 (32,623 ) 6,639 — 39,461 Investments in associates or subsidiaries (8,668,016 ) (5,447 ) 6,592 — (8,666,871 ) Property, plant and equipment (6,860,440 ) 337,662 — — (6,522,778 ) Finance lease (426,949 ) (26,125 ) — — (453,074 ) Intangible assets 7,648 (1,593 ) — — 6,055 Financial assets at fair value through profit or loss 890 (871 ) — — 19 Financial assets at fair value through other comprehensive income (8,843 ) (1,379 ) 35,798 — 25,576 Deferred revenue 230,711 (10,969 ) — — 219,742 Provisions 4,822,833 (21,887 ) — — 4,800,946 Doubtful receivables 59 — — — 59 Other finance liabilities 32,755 2,465 — 4,273 39,493 Gains or losses on foreign exchange translation (1,354 ) 28,434 — — 27,080 Allowance for doubtful accounts 42,931 15,825 — — 58,756 Accrued income (1,825 ) (1,089 ) — — (2,914 ) Special deduction for property, plant and equipment (200,927 ) (10,819 ) — — (211,746 ) Reserve for research and human development (3,041 ) 3,041 — — — Others 952,754 105,869 (5,477 ) — 1,053,146 (9,516,675 ) 422,638 97,255 4,273 (8,992,509 ) Deferred tax on unused tax losses and tax credit Unused tax losses — 554,457 — — 554,457 Excess of donation limit — 17,848 — — 17,848 Tax credit 20,431 16,225 — — 36,656 20,431 588,530 — — 608,961 ￦ (9,496,244 ) 1,011,168 97,255 4,273 (8,383,548 ) 2019 Beginning balance Amounts Amount Amounts recognized directly in equity Others(*) Ending balance In millions of won Deferred tax on temporary differences Employee benefits ￦ 594,541 94,541 (40,235 ) — — 648,847 Cash flow hedge 39,461 (23,977 ) (15,642 ) (841 ) — (999 ) Investments in associates or subsidiaries (8,666,871 ) (3,131 ) 4,275 — — (8,665,727 ) Property, plant and equipment (6,522,778 ) (592,440 ) — — — (7,115,218 ) Finance lease (453,074 ) 292,631 — — — (160,443 ) Intangible assets 6,055 (20,232 ) — — (41,729 ) (55,906 ) Financial assets at fair value through profit or loss 19 322 — — — 341 Financial assets at fair value through other comprehensive income 25,576 (3,114 ) (4,217 ) — — 18,245 Deferred revenue 219,742 (6,739 ) — — — 213,003 Provisions 4,800,946 655,973 — — — 5,456,919 Doubtful receivables 59 — — — — 59 Other finance liabilities 39,493 (4,402 ) — 4,273 — 39,364 Gains or losses on foreign exchange translation 27,080 30,881 — — — 57,961 Allowance for doubtful accounts 58,756 (1,149 ) — — — 57,607 Accrued income (2,914 ) (1,462 ) — — — (4,376 ) Special deduction for property, plant and equipment (211,746 ) (3,627 ) — — — (215,373 ) Others 1,053,146 290,484 (914 ) — — 1,342,716 (8,992,509 ) 704,559 (56,733 ) 3,432 (41,729 ) (8,382,980 ) Deferred tax on unused tax losses and tax credit Unused tax losses 554,457 557,356 — — — 1,111,813 Excess of donation limit 17,848 18,847 — — — 36,695 Tax credit 36,656 70,870 — — — 107,526 608,961 647,073 — — — 1,256,034 ￦ (8,383,548 ) 1,351,632 (56,733 ) 3,432 (41,729 ) (7,126,946 ) (*) ‘Others’ include amount changed due to business combination. (see Note 51) (6) Deferred tax assets (liabilities) recognized in the statements of financial position as of December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Deferred tax assets ￦ 1,233,761 1,437,829 Deferred tax liabilities (9,617,309 ) (8,564,775 ) ￦ (8,383,548 ) (7,126,946 ) (7) Details of deductible temporary differences, tax losses and unused tax credits for which no deferred tax assets were recognized as of December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Deductible temporary differences ￦ 442,391 541,449

Assets Held-for-Sale

Assets Held-for-Sale	12 Months Ended
	Dec. 31, 2019
Assets Held-for-Sale [Abstract]
Assets Held-for-Sale	42. Assets Held-for-Sale Assets held-for-sale 2018 2019 In millions of won Land(*1) ￦ 2,765 23,002 Building(*1) 19,369 193 Investments(*2, 3, 4) 747 4,921 ￦ 22,881 28,116 (*1) The board of directors of KEPCO Engineering & Construction Company, Inc., a subsidiary of the Company, determined to dispose the premises in Yongin as part of the government’s plan to relocate state-run held-for-sale. held-for-sale (*2) Ulleungdo Natural Energy Co., Ltd. was in the process of liquidating its business as of December 31, 2019 and has been reclassified to assets held-for-sale, (*3) Garolim Tidal Power Plant Co., Ltd. was in the process of liquidating its business as of December 31, 2019 and has been reclassified to assets held-for-sale, (*4) As of December 31, 2018, the Company reclassified investment of its subsidiary, KOWEPO India Private Limited, as assets held-for-sale due to the decision to liquidate the company. The liquidation process was completed during the year ended December 31, 2019.

Expenses Classified by Nature

Expenses Classified by Nature	12 Months Ended
	Dec. 31, 2019
Expenses Classified by Nature [Abstract]
Expenses Classified by Nature	43. Expenses Classified by Nature Expenses classified by nature for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 Selling and Cost of sales Total In millions of won Raw materials used ￦ — 15,924,707 15,924,707 Salaries 735,383 3,479,591 4,214,974 Retirement benefit expense 71,094 397,852 468,946 Welfare and benefit expense 179,406 543,738 723,144 Insurance expense 15,414 90,677 106,091 Depreciation 190,245 9,461,974 9,652,219 Amortization of intangible assets 44,990 68,682 113,672 Bad debt expense 126,714 — 126,714 Commission 673,740 469,695 1,143,435 Advertising expense 114,519 10,917 125,436 Training expense 7,027 14,362 21,389 Vehicle maintenance expense 9,998 7,468 17,466 Publishing expense 3,672 4,248 7,920 Business promotion expense 3,700 4,973 8,673 Rent expense 38,380 148,509 186,889 Telecommunication expense 24,916 73,956 98,872 Transportation expense 495 9,145 9,640 Taxes and dues 48,395 437,643 486,038 Expendable supplies expense 7,731 31,994 39,725 Water, light and heating expense 10,545 30,150 40,695 Repairs and maintenance expense 63,477 2,047,943 2,111,420 Ordinary development expense 211,417 510,020 721,437 Travel expense 16,658 69,015 85,673 Clothing expense 8,410 4,985 13,395 Survey and analysis expense 698 3,661 4,359 Membership fee 1,122 8,482 9,604 Power purchase — 14,264,331 14,264,331 Others 154,709 3,980,137 4,134,846 ￦ 2,762,855 52,098,855 54,861,710 2018 Selling and Cost of sales Total In millions of won Raw materials used ￦ — 19,537,928 19,537,928 Salaries 757,819 3,478,804 4,236,623 Retirement benefit expense 65,107 375,505 440,612 Welfare and benefit expense 132,089 464,483 596,572 Insurance expense 12,181 93,876 106,057 Depreciation 214,499 9,683,887 9,898,386 Amortization of intangible assets 54,153 64,785 118,938 Bad debt expense 39,784 — 39,784 Commission 714,096 475,188 1,189,284 Advertising expense 30,894 9,419 40,313 Training expense 6,277 14,096 20,373 Vehicle maintenance expense 10,148 7,809 17,957 Publishing expense 3,307 3,530 6,837 Business promotion expense 2,785 3,860 6,645 Rent expense 42,851 171,132 213,983 Telecommunication expense 23,505 82,568 106,073 Transportation expense 686 4,537 5,223 Taxes and dues 46,424 440,317 486,741 Expendable supplies expense 6,166 31,844 38,010 Water, light and heating expense 12,629 34,640 47,269 Repairs and maintenance expense 62,580 2,156,668 2,219,248 Ordinary development expense 215,494 508,394 723,888 Travel expense 14,363 67,064 81,427 Clothing expense 10,108 4,368 14,476 Survey and analysis expense 705 3,929 4,634 Membership fee 1,043 11,563 12,606 Power purchase — 18,307,289 18,307,289 Others 148,197 2,170,238 2,318,435 ￦ 2,627,890 58,207,721 60,835,611 2019 Selling and Cost of sales Total In millions of won Raw materials used ￦ — 17,084,029 17,084,029 Salaries 775,204 3,834,772 4,609,976 Retirement benefit expense 157,272 652,467 809,739 Welfare and benefit expense 120,463 443,482 563,945 Insurance expense 12,427 93,702 106,129 Depreciation 232,510 10,734,246 10,966,756 Amortization of intangible assets 76,547 80,368 156,915 Bad debt expense (12,719 ) — (12,719 ) Commission 632,849 378,861 1,011,710 Advertising expense 34,453 9,852 44,305 Training expense 7,174 16,903 24,077 Vehicle maintenance expense 9,525 7,652 17,177 Publishing expense 3,414 3,423 6,837 Business promotion expense 3,038 3,981 7,019 Rent expense 40,505 176,413 216,918 Telecommunication expense 8,451 11,034 19,485 Transportation expense 865 4,555 5,420 Taxes and dues 58,666 481,684 540,350 Expendable supplies expense 6,682 32,999 39,681 Water, light and heating expense 11,867 32,378 44,245 Repairs and maintenance expense 88,576 2,210,278 2,298,854 Ordinary development expense 224,463 511,252 735,715 Travel expense 15,652 68,581 84,233 Clothing expense 9,369 7,539 16,908 Survey and analysis expense 848 3,949 4,797 Membership fee 969 12,730 13,699 Power purchase — 18,269,732 18,269,732 Others 150,506 2,612,973 2,763,479 ￦ 2,669,576 57,779,835 60,449,411

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2019
Earnings per share [Abstract]
Earnings per share	44. Earnings (Loss) Per Share (1) Basic earnings (loss) per share for the years ended December 31, 2017, 2018 and 2019 are as follows: Type 2017 2018 2019 In won Basic earnings (loss) per share ￦ 2,023 (2,048 ) (3,654 ) (2) Diluted earnings (loss) per share for the years ended December 31, 2017, 2018 and 2019 are as follows: Type 2017 2018 2019 In won Diluted earnings (loss) per share ￦ 2,023 (2,048 ) (3,654 ) (3) Basic earnings (loss) per share Net profit (loss) for the period and weighted average number of common shares used in the calculation of basic earnings (loss) per share for the years ended December 31, 2017, 2018 and 2019 are as follows: Type 2017 2018 2019 In millions of won except number of shares Net profit (loss) attributable to controlling interest ￦ 1,298,720 (1,314,567 ) (2,345,517 ) Profit (loss) used in the calculation of total basic earnings (loss) per share 1,298,720 (1,314,567 ) (2,345,517 ) Weighted average number of common shares 641,964,077 641,964,077 641,964,077 (4) Diluted earnings (loss) per share Diluted earnings (loss) per share is calculated by applying adjusted weighted average number of common shares under the assumption that all dilutive potential common shares are converted to common shares. Earnings (loss) used in the calculation of total diluted earnings per share for the years ended December 31, 2017, 2018 and 2019 are as follows: Type 2017 2018 2019 In millions of won Profit (loss) used in the calculation of total diluted earnings (loss) per share ￦ 1,298,720 (1,314,567 ) (2,345,517 ) Weighted average common shares used in calculating diluted earnings (loss) per share are adjusted from weighted average common shares used in calculating basic earnings (loss) per share. Detailed information of the adjustment for the years ended December 31, 2017, 2018 and 2019 are as follows: Type 2017 2018 2019 In number of shares Weighted average number of common shares 641,964,077 641,964,077 641,964,077 Diluted weighted average number of shares 641,964,077 641,964,077 641,964,077 (5) There are no potential dilutive instruments, thus diluted earnings (loss) per share are same as basic earnings (loss) per share for the years ended December 31, 2017, 2018 and 2019.

Risk Management

Risk Management	12 Months Ended
	Dec. 31, 2019
Risk Management [Abstract]
Risk Management	45. Risk Management (1) Capital risk management The Company manages its capital to ensure that entities in the Company will be able to continue while maximizing the return to shareholder through the optimization of the debt and equity balance. The capital structure of the Company consists of net debt (offset by cash and cash equivalents) and equity. The Company’s overall capital risk management strategy remains consistent with the prior year. Details of the Company’s capital management accounts as of December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Total borrowings and debt securities ￦ 61,034,627 67,876,541 Cash and cash equivalents 1,358,345 1,810,129 Net borrowings and debt securities 59,676,282 66,066,412 Total shareholders’ equity 71,092,762 68,889,649 Debt to equity ratio 83.94 % 95.90 % (2) Financial risk management The Company is exposed to various risks related to its financial instruments, such as, market risk (currency risk, interest rate risk, price risk), credit risk. The Company monitors and manages the financial risks relating to the operations of the Company through internal risk reports which analyze exposures by degree and magnitude of risks. The Company uses derivative financial instruments to hedge certain risk exposures. The Company’s overall financial risk management strategy remains consistent with the prior year. (i) Credit risk Credit risk is the risk of finance loss to the Company if a customer or counterparty to a financial instrument fails to meet its contractual obligations, and arises primarily from the sales activities, securities and derivatives. In addition, credit risk exposure may exist within financial guarantees and unused line of credits. As these financial institutions the Company makes transactions with are reputable financial institutions, the credit risk from them are considered limited. The Company decides credit transaction limits based on evaluation of client’s credit, through information obtained from the credit bureau and disclosed financial position at committing contracts. ① Credit risk management Electricity sales, the main operations of the Company are the necessity for daily life and industrial activities of Korean nationals and have importance as one of the national key industries. The Company dominates the domestic market supplying electricity to customers. The Company is not exposed to significant credit risk as customers of the Company are diverse and are from various industries and areas. The Company uses publicly available information and its own internal data related to trade receivables, to rate its major customers and to measure the credit risk that a counter party will default on a contractual obligation. For the incurred but not recognized loss, it is measured considering overdue period. ② Impairment and allowance account In accordance with the Company policies, individual material financial assets are assessed on a regular basis, trade receivables that are assessed not to be impaired individually are, in addition, assessed for impairment on a collective basis. Value of the acquired collateral (including the confirmation of feasibility) and estimated collectable amounts are included in this assessment. Allowance for bad debts assessed on a collective basis are recognized for (i) the group of assets which individually are not material and (ii) incurred but not recognized losses that are assessed using statistical methods, judgment and past experience. Book values of the financial assets represent the maximum exposed amounts of the credit risk. Details of the Company’s level of maximum exposure to credit risk as of December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Cash and cash equivalents ￦ 1,358,345 1,810,129 Financial assets at fair value through profit or loss 920,935 747,261 Derivative assets (trading) 37,631 165,204 Financial assets at amortized cost 14,042 13,609 Loans 718,674 738,707 Long-term/short-term financial instruments 2,318,027 1,960,227 Derivative assets (applying hedge accounting) 64,704 145,829 Trade and other receivables 9,613,437 9,703,749 Financial guarantee contracts(*) 1,310,817 3,338,566 (*) Maximum exposure associated with the financial guarantee contracts is the maximum amounts of the obligation. As of the reporting date, there are no financial assets and non-financial (ii) Market risk Market risk is the risk that the Company’s fair values of the financial instruments or future cash flows are affected by the changes in the market. Market risk consists of interest rate risk, currency risk and other price risk. (iii) Sensitivity analysis Significant assets and liabilities with uncertainties in underlying assumptions ① Defined benefit obligation A sensitivity analysis of defined benefit obligation assuming a 1% increase and decrease movements in the actuarial valuation assumptions as of December 31, 2018 and 2019 are as follows: 2018 2019 Type Accounts 1% Increase 1% Decrease 1% Increase 1% Decrease In millions of won Future salary increases Increase (decrease) in defined benefit obligation ￦ 416,956 (363,820 ) 442,748 (386,147 ) Discount rate Increase (decrease) in defined benefit obligation (377,221 ) 445,833 (402,099 ) 475,765 Changes of employee benefits assuming a 1% increase and decrease movements in discount rate on plan asset for the years ended December 31, 2018 and 2019 are ￦14,646 million and ￦17,734 million, respectively. ② Provisions Changes in provisions due to movements in underlying assumptions as of December 31, 2018 and 2019 are as follows: Type Accounts 2018 2019 PCBs Inflation rate 1.27 % 1.09 % Discount rate 2.18 % 1.97 % Nuclear plants Inflation rate 1.21 % 1.10 % Discount rate 2.94 % 2.43 % Spent fuel Inflation rate 2.93 % 2.93 % Discount rate 4.49 % 4.49 % A sensitivity analysis of provisions assuming a 0.1% increase and decrease movements in the underlying assumptions as of December 31, 2018 and 2019 are as follows: 2018 2019 Type Accounts 0.1% Increase 0.1% Decrease 0.1% Increase 0.1% Decrease In millions of won Discount rate PCBs ￦ (623 ) 627 (527 ) 530 Nuclear plants (256,513 ) 263,595 (316,184 ) 325,828 Spent fuel (49,182 ) 51,098 (51,607 ) 53,621 Inflation rate PCBs 632 (629 ) 534 (532 ) Nuclear plants 294,984 (287,110 ) 346,082 (336,182 ) Spent fuel 51,837 (49,961 ) 54,396 (52,424 ) Management judgment effected by uncertainties in underlying assumptions ① Foreign currency risk The Company undertakes transactions denominated in foreign currencies; consequently, exposures to exchange rate fluctuations arise. The carrying amounts of the Company’s foreign currency denominated monetary assets and monetary liabilities as of December 31, 2018 and 2019 are as follows: Assets Liabilities Type 2018 2019 2018 2019 In thousands of foreign currencies AED 10,513 57,403 5,890 40,061 AUD 143 143 717,712 1,036,785 BDT 71,575 85,547 1,175 635 BWP 1,214 1,437 — — CAD 96 86 4 3,112 CHF — — 400,000 500,753 CNY — — 26,140 26,140 CZK — — — 243 EUR 337 208 105,673 111,199 GBP — — 1 191 GHS 25,794 — — — HKD — — 1,650,000 1,648,815 IDR 60,568 376,136 206,935 219,801 INR 1,228,795 1,244,170 183,963 210,232 JOD 2,764 1,516 5 147 JPY 35,935 109,970 390,921 314,402 KZT 319 319 — — MGA 3,318,447 3,858,201 170,641 133,403 MMK 25,208 29,651 — — PHP 709,285 175,210 66,985 130,073 PKR 305,542 354,361 3,588 4,366 SAR 2,024 2,653 — 480 SEK — — 450,000 449,072 USD 1,422,510 1,227,054 8,103,602 9,963,928 UYU 39,898 58,781 4,253 8,213 VND — 418,998 — 1,375 ZAR 170 450 4 6 A sensitivity analysis on the Company’s income for the period assuming a 10% increase and decrease in currency exchange rates as of December 31, 2018 and 2019 are as follows: 2018 2019 Type 10% Increase 10% Decrease 10% Increase 10% Decrease In millions of won Increase (decrease) of profit before income tax ￦ (887,561 ) 887,561 (1,197,530 ) 1,197,530 Increase (decrease) of shareholder’s equity(*) (887,561 ) 887,561 (1,197,530 ) 1,197,530 (*) The effect on the shareholders’ equity excluding the impact of income taxes. The sensitivity analysis above is conducted for monetary assets and liabilities denominated in foreign currencies other than functional currency, without consideration of hedge effect of related derivatives, as of December 31, 2018 and 2019. To manage its foreign currency risk related to foreign currency denominated receivables and payables, the Company has a policy to enter into currency forward agreements. In addition, to manage its foreign currency risk related to foreign currency denominated expected sales transactions and purchase transactions, the Company enters into cross-currency swap agreements. ② Interest rate risk The Company is exposed to interest rate risk due to its borrowing with floating interest rates. A 1% increase or decrease is used when reporting interest rate risk internally to key management personnel and represents management’s assessment of the reasonably possible change in interest rates. The Company’s borrowings and debt securities with floating interest rates as of December 31, 2018 and 2019 are as follows: Type 2018 2019 In millions of won Short-term borrowings ￦ 24,235 — Long-term borrowings 2,358,860 2,273,579 Debt securities — 243,102 ￦ 2,383,095 2,516,681 A sensitivity analysis on the Company’s long-term borrowings and debt securities assuming a 1% increase and decrease in interest rates, without consideration of hedge effect of related derivatives for the years ended December 31, 2018 and 2019 are as follows: 2018 2019 Type 1% Increase 1% Decrease 1% Increase 1% Decrease In millions of won Increase (decrease) of profit before income tax ￦ (23,831 ) 23,831 (25,167 ) 25,167 Increase (decrease) of shareholder’s equity(*) (23,831 ) 23,831 (25,167 ) 25,167 (*) The effect on the shareholders’ equity excluding the impact of income taxes. To manage its interest rate risks, the Company enters into certain interest swap agreements or maintains an appropriate mix of fixed and floating rate borrowings. ③ Electricity rates risk The Company is exposed to electricity rates risk due to the rate regulation of the government which considers the effect of electricity rate on the national economy. A sensitivity analysis on the Company’s income for the period assuming a 1% increase and decrease in price of electricity for the years ended December 31, 2018 and 2019 are as follows: 2018 2019 Type 1% Increase 1% Decrease 1% Increase 1% Decrease In millions of won Increase (decrease) of profit before income tax ￦ 568,420 (568,420 ) 559,390 (559,390 ) Increase (decrease) of shareholder’s equity(*) 568,420 (568,420 ) 559,390 (559,390 ) (*) The effect on the shareholders’ equity excluding the impact of income taxes. (iv) Liquidity risk The Company has established an appropriate liquidity risk management framework for the management of the Company’s short, medium and long-term funding and liquidity management requirements. The Company manages liquidity risk by continuously monitoring forecasted and actual cash flows, and by matching the maturity profiles of financial assets and liabilities. In addition, the Company has established credit lines on its trade financing and bank overdrafts, and through payment guarantees it has received, it maintains an adequate credit (borrowing) line. In addition, the Company has the ability to utilize excess cash or long-term borrowings for major construction investments. The following table shows the details of maturities of non-derivative non-derivative 2018 Type Less than 1 year 1~2 Years 2~5 Years More than 5 years Total In millions of won Borrowings and debt securities ￦ 10,204,471 9,274,378 28,143,311 25,312,534 72,934,694 Finance lease liabilities 87,709 87,709 141,074 65,250 381,742 Trade and other payables 6,348,195 150,479 375,661 2,188,950 9,063,285 Financial guarantee contracts(*) 91,722 855,488 363,607 — 1,310,817 ￦ 16,732,097 10,368,054 29,023,653 27,566,734 83,690,538 2019 Type Less than 1 year 1~2 Years 2~5 Years More than 5 years Total In millions of won Borrowings and debt securities ￦ 10,660,737 10,997,510 27,881,873 30,859,669 80,399,789 Lease liabilities 686,445 617,449 1,717,434 2,735,681 5,757,009 Trade and other payables 6,014,054 382,809 971,469 1,176,697 8,545,029 Financial guarantee contracts(*) 937,091 302,186 32,314 2,066,975 3,338,566 ￦ 18,298,327 12,299,954 30,603,090 36,839,022 98,040,393 (*) This represents the total guarantee amounts associated with the financial guarantee contracts. Financial guarantee liabilities which are recognized as of December 31, 2018 and 2019 are ￦15,586 million and ￦81,357 million, respectively. The expected maturities for non-derivative 2018 Type Less than 1 year 1~5 Years More than 5 years Other(*) Total In millions of won Cash and cash equivalents ￦ 1,358,345 — — — 1,358,345 Financial assets at fair value through other comprehensive income — — — 399,495 399,495 Financial assets at amortized cost 11,956 2,086 — — 14,042 Loans 123,646 314,744 319,988 — 758,378 Long-term/short-term financial instruments 1,869,286 278,899 164,057 5,785 2,318,027 Financial assets at fair value through profit or loss 313,893 81,828 483,398 41,816 920,935 Trade and other receivables 7,795,619 1,067,800 701,743 57,651 9,622,813 ￦ 11,472,745 1,745,357 1,669,186 504,747 15,392,035 2019 Type Less than 1 year 1~5 Years More than 5 years Other(*) Total In millions of won Cash and cash equivalents ￦ 1,810,129 — — — 1,810,129 Financial assets at fair value through other comprehensive income — — — 379,170 379,170 Financial assets at amortized cost 12,302 1,307 — — 13,609 Loans 64,081 346,583 336,502 27,606 774,772 Long-term/short-term financial instruments 1,351,971 269,863 — 338,393 1,960,227 Financial assets at fair value through profit or loss 131,385 79 — 615,797 747,261 Trade and other receivables 7,703,746 980,951 818,431 207,979 9,711,107 ￦ 11,073,614 1,598,783 1,154,933 1,568,945 15,396,275 (*) The maturities cannot be presently determined. Derivative liabilities classified by maturity periods which from reporting date to maturity dates as per the contracts as of December 31, 2018 and 2019 are as follows: 2018 Type Less than 1 year 1~2 Years 2~5 Years More than 5 years Total In millions of won Net settlement —Trading ￦ — — — — — Gross settlement —Trading 5,734 16,565 28,283 40,124 90,706 —Hedging 5,154 (43,447 ) 71,840 (40,917 ) (7,370 ) ￦ 10,888 (26,882 ) 100,123 (793 ) 83,336 2019 Type Less than 1 year 1~2 Years 2~5 Years More than 5 years Total In millions of won Net settlement —Trading ￦ (3,017 ) — — — (3,017 ) Gross settlement —Trading (15,011 ) (8,295 ) (39,654 ) 4,235 (58,725 ) —Hedging (59,846 ) (21,466 ) (1,914 ) (33,588 ) (116,814 ) ￦ (77,874 ) (29,761 ) (41,568 ) (29,353 ) (178,556 ) (3) Fair value risk The fair value of the Company’s actively-traded financial instruments (i.e., FVTPL, FVOCI, etc.) is based on the traded market-price as of the reporting period end. The fair value of the Company’s financial assets is the amount which the asset could be exchanged for or the amount a liability could be settled for. The fair values of financial instruments where no active market exists or where quoted prices are not otherwise available are determined by using valuation techniques. Valuation techniques include using recent arm’s length market transactions between knowledgeable, willing parties, if available, reference to the current fair value of another instrument that is substantially the same, discounted cash flow analysis and option pricing models. If there is a valuation technique commonly used by market participants to price the instrument and that technique has been demonstrated to provide reliable estimates of prices obtained in actual market transactions, the Company uses that technique. For trade receivables and payables, the Company considers the carrying value net of impairment as fair value. While for disclosure purposes, the fair value of financial liabilities are estimated by discounting the financial instruments with similar contractual cash flows based on the effective interest method. (i) Fair value and book value of financial assets and liabilities as of December 31, 2018 and 2019 are as follows: 2018 2019 Type Book value Fair value Book value Fair value In millions of won Assets recognized at fair value Financial assets at fair value through other comprehensive income ￦ 399,495 399,495 379,170 379,170 Derivative assets (trading) 37,631 37,631 165,204 165,204 Derivative assets (applying hedge accounting) 64,704 64,704 145,829 145,829 Financial assets at fair value through profit or loss 920,935 920,935 747,261 747,261 ￦ 1,422,765 1,422,765 1,437,464 1,437,464 Assets carried at amortized cost Financial assets at amortized cost ￦ 14,042 14,042 13,609 13,609 Loans and receivables 718,674 718,674 738,707 738,707 Long-term financial instruments 448,741 448,741 608,256 608,256 Short-term financial instruments 1,869,286 1,869,286 1,351,971 1,351,971 Trade and other receivables 9,613,437 9,613,437 9,703,749 9,703,749 Cash and cash equivalents 1,358,345 1,358,345 1,810,129 1,810,129 ￦ 14,022,525 14,022,525 14,226,421 14,226,421 Liabilities recognized at fair value Derivative liabilities (trading) ￦ 99,010 99,010 53,147 53,147 Derivative liabilities (applying hedge accounting) 213,153 213,153 116,813 116,813 ￦ 312,163 312,163 169,960 169,960 Liabilities carried at amortized cost Secured borrowings ￦ 741,029 741,029 227,135 227,135 Unsecured bond 56,603,988 58,804,070 63,171,664 66,917,421 Lease liabilities — — 5,070,133 5,070,133 Finance lease liabilities 283,806 283,806 — — Unsecured borrowings 3,522,602 3,950,517 4,104,523 4,113,955 Trade and other payables(*) 9,063,285 9,063,285 8,545,029 8,545,029 Bank overdraft 167,008 167,008 373,219 373,219 ￦ 70,381,718 73,009,715 81,491,703 85,246,892 (*) Excludes lease liabilities (current year) and finance lease liabilities (prior year) (ii) Interest rates used for determining fair value The interest rates used to discount estimated cash flows, when applicable, are based on the government yield curve at the reporting date plus an adequate credit spread. The discount rate used for calculating fair value as of December 31, 2018 and 2019 are as follows: Type 2018 2019 Derivatives 0.02% ~ 4.16% 0.01% ~ 4.16% Borrowings and debt securities 0.51% ~ 5.14% 0.17% ~ 3.90% Lease 3.50% ~ 10.83% 1.38% ~ 10.83% (iii) Fair value hierarchy The following table provides an analysis of financial instruments that are measured subsequent to initial recognition at fair value, classified as Level 1, 2 or 3, based on the degree to which the fair value is observable. Level 1: Unadjusted quoted prices in active markets for identical assets or liabilities; Level 2: Inputs other than quoted prices that are observable for the asset or liability either directly or indirectly; and Level 3: Inputs that are not based on observable market data. Fair values of financial instruments by hierarchy level as of December 31, 2018 and 2019 are as follows: 2018 Type Level 1 Level 2 Level 3 Total In millions of won Financial assets at fair value Financial assets at fair value through other comprehensive income ￦ 210,056 — 189,439 399,495 Derivative assets — 100,490 1,845 102,335 Financial assets at fair value through profit or loss 106,600 809,283 5,052 920,935 ￦ 316,656 909,773 196,336 1,422,765 Financial liabilities at fair value Derivative liabilities ￦ — 310,008 2,155 312,163 2019 Type Level 1 Level 2 Level 3 Total In millions of won Financial assets at fair value Financial assets at fair value through other comprehensive income ￦ 201,202 — 177,968 379,170 Derivative assets — 308,399 2,634 311,033 Financial assets at fair value through profit or loss — 742,105 5,156 747,261 ￦ 201,202 1,050,504 185,758 1,437,464 Financial liabilities at fair value Derivative liabilities ￦ — 169,960 — 169,960 The fair value of financial assets (FVTPL and FVOCI) publicly traded is measured at the closing bid price quoted at the end of the reporting period. Meanwhile, the fair value of unquoted financial assets (FVTPL and FVOCI) is calculated using the valuation results from an external pricing service in which weighted average borrowing rates of interest of evaluated companies are used as a discount rate. The fair value of derivatives is measured using valuation model which is determined at the present value of estimated future cash flows discounted at current market interest rate. Changes of financial assets and liabilities which are classified as level 3 for the years ended December 31, 2018 and 2019 are as follows: 2018 Beginning Effect of Acquisition Reclassified Valuation Disposal Foreign Ending In millions of won Financial assets at fair value Financial assets at fair value through profit or loss Cooperative ￦ — 5,038 — — 14 — — 5,052 Financial assets at fair Unlisted securities — 197,450 — — (11,744 ) (326 ) 4,059 189,439 2019 Beginning Effect of Acquisition Reclassified Valuation Disposal Foreign Ending In millions of won Financial assets at fair value Financial assets at fair value through profit or loss Cooperative ￦ 5,052 — 40 — 64 — — 5,156 Financial assets at fair value through other comprehensive income Unlisted securities 189,439 — 1,876 — 3,715 (19,315 ) 2,253 177,968

Service Concession Arrangements

Service Concession Arrangements	12 Months Ended
	Dec. 31, 2019
Service Concession Arrangements [Abstract]
Service Concession Arrangements	46. Service Concession Arrangements (1) Gas Complex (i) Significant terms and concession period of the arrangement The Company has entered into a contract with National Power Corporation (the “NPC”), based in the Republic of the Philippines whereby the Company can collect the electricity rates which are composed of fixed costs and variable costs during the concession period from 2002 to 2022 after building, rehabilitating, and operating the power plant. (ii) Rights and classification of the arrangement The Company has the rights to use and own the power plant during the concession period from 2002 to 2022. At the end of the concession period, the Company has an obligation to transfer its ownership of the power plant to NPC. (iii) The Company’s expected future collections of service concession arrangements as of December 31, 2019 are as follows: Type Amounts In millions of won Less than 1 year ￦ 120,937 1~ 2 years 120,937 2~ 3 years 50,390 ￦ 292,264 (2) Hydroelectric Power Generation at Semangka, Indonesia (BOT) (i) Significant terms and concession period of the arrangement The Company has entered into a contract with PT. Perusahaan Listrik Negara (the “PLN”) whereby the Company provides electricity generated and charge tariff rates designed to recover capital cost, fixed O&M cost, water usage cost, variable O&M cost and special facilities cost during the concession period after building, rehabilitating, and operating the power plant for approximately 30 years (2018~2048) subsequent to the completion of plant construction. (ii) Rights and classification of the arrangement The Company has the rights to use and own the power plant during the concession period from 2018 to 2048. At the end of the concession period, PNL has an option to take over the ownership of the power plant from the Company. (iii) The Company’s expected future collections of service concession arrangements as of December 31, 2019 are as follows: Type Amounts In millions of won Less than 1 year ￦ 28,921 1~ 2 years 28,853 2~ 3 years 28,885 Over 3 years 587,972 ￦ 674,631

Related Parties

Related Parties	12 Months Ended
	Dec. 31, 2019
Related Parties [Abstract]
Related Parties	47. Related Parties (1) Related parties of the Company as of December 31, 2019 are as follows: Type Related party Parent Republic of Korea government Subsidiaries (119 subsidiaries) Korea Hydro & Nuclear Power Co., Ltd., Korea South-East Power Co., Ltd., Korea Midland Power Co., Ltd., Korea Western Power Co., Ltd., Korea Southern Power Co., Ltd., Korea East-West Power Co., Ltd., KEPCO Engineering & Construction Company, Inc., KEPCO Plant Service & Engineering Co., Ltd., KEPCO Nuclear Fuel Co., Ltd., KEPCO KDN Co., Ltd., Gyeonggi Green Energy Co., Ltd., Korea Offshore Wind Power Co., Ltd., KOSEP Material Co., Ltd., KEPCO International HongKong Ltd., KEPCO International Philippines Inc., KEPCO Philippines Corporation, KEPCO Ilijan Corporation, KEPCO Gansu International Ltd., KEPCO Philippines Holdings Inc., KEPCO Lebanon SARL, KEPCO Neimenggu International Ltd., KEPCO Australia Pty., Ltd., KEPCO Shanxi International Ltd., KOMIPO Global Pte Ltd., KOSEP Australia Pty., Ltd., KOMIPO Australia Pty., Ltd., KOWEPO Australia Pty., Ltd., KOSPO Australia Pty., Ltd., KEPCO Netherlands B.V., KOREA Imouraren Uranium Investment Corp., KEPCO Middle East Holding Company, Qatrana Electric Power Company, KOWEPO International Corporation, KOSPO Jordan LLC, Korea Waterbury Uranium Limited Partnership, PT. Cirebon Power Service, EWP America Inc., KHNP Canada Energy, Ltd., KEPCO Bylong Australia Pty., Ltd., KNF Canada Energy Limited, KEPCO Holdings de Mexico, KST Electric Power Company S.A.P.I. de C.V., KEPCO Energy Service Company, KEPCO Netherlands S3 B.V., PT. KOMIPO Pembangkitan Jawa Bali, EWP Barbados 1 SRL, PT. Tanggamus Electric Power, KOMIPO America Inc., KOSEP USA, Inc., PT. EWP Indonesia, KEPCO Netherlands J3 B.V., Global One Pioneer B.V., Global Energy Pioneer B.V., Mira Power Limited, EWP Philippines Corporation, KEPCO KPS Philippines Corp., KOSPO Chile SpA, PT. KOWEPO Sumsel Operation And Maintenance Services, Commerce and Industry Energy Co., Ltd., Gyeongju Wind Power Co., Ltd., California Power Holdings, LLC, DG Fairhaven Power, LLC, DG Whitefield, LLC, EWP Renewable Corporation, EWPRC Biomass Holdings, LLC, Springfield Power, LLC, HeeMang Sunlight Power Co., Ltd., Fujeij Wind Power Company, KOSPO Youngnam Power Co., Ltd., VI Carbon Professional Private Special Asset Investment Trust 1, Chitose Solar Power Plant LLC., Solar School Plant Co., Ltd., KEPCO Energy Solution Co., Ltd., KOSPO Power Services Limitada, KOEN Bylong Pty., Ltd., KOWEPO Bylong Pty., Ltd., KOSPO Bylong Pty., Ltd., EWP Bylong Pty., Ltd., KOWEPO Lao International, KOMIPO Bylong Pty., Ltd., Energy New Industry Specialized Investment Private Investment Trust., KEPCO US Inc., KEPCO Alamosa LLC, KEPCO Solar of Alamosa, LLC (formerly, Cogentrix of Alamosa, LLC), KEPCO-LG KEPCO-LG e-New e-New E-New Associates (66 associates) Dongducheon Dream Power Co., Ltd., Korea Gas Corporation, Daegu Photovoltaic Co., Ltd., Haeng Bok Do Si Photovoltaic Power Co., Ltd., Korea Electric Power Industrial Development Co., Ltd., Goseong Green Energy Co., Ltd., Gangneung Eco Power Co., Ltd., Shin Pyeongtaek Power Co., Ltd., Naepo Green Energy Co., Ltd., Noeul Green Energy Co., Ltd., YTN Co., Ltd., Cheongna Energy Co., Ltd., Samcheok Eco Materials Co., Ltd., Gangwon Wind Power Co., Ltd., Gwangyang Green Energy Co., Ltd., Hyundai Green Power Co., Ltd., Korea Power Exchange, Hyundai Energy Co., Ltd., Ecollite Co., Ltd., Taebaek Wind Power Co., Ltd., Taebaek Guinemi Wind Power Co., Ltd., Pyeongchang Wind Power Co., Ltd., Daeryun Power Co., Ltd., Changjuk Wind Power Co., Ltd., KNH Solar Co., Ltd., S-Power Xe-Pian Xe-Namnoy Suwon New Power Co., Ltd., KPG Co., Ltd., Gwangbaek Solar Power Investment Co., Ltd., Goduk Clean Energy Co., Ltd. Joint ventures (64 joint ventures) Daegu Green Power Co., Ltd., KEPCO SPC Power Corporation, KAPES, Inc., Honam Wind Power Co., Ltd., Jeongam Wind Power Co., Ltd., Korea Power Engineering Service Co., Ltd., Seokmun Energy Co., Ltd., Incheon New Power Co., Ltd., Chun-cheon Energy Co., Ltd., Yeonggwangbaeksu Wind Power Co., Ltd., KW Nuclear Components Co., Ltd., KEPCO-Uhde Inc., Busan Shinho Solar Power Co., Ltd., Global Trade Of Power System Co., Ltd., Expressway Solar-light Power Generation Co., Ltd., Gansu Datang Yumen Wind Power Co., Ltd., Datang Chifeng Renewable Power Co., Ltd., Rabigh Electricity Company, Rabigh Operation & Maintenance Company Limited, Datang KEPCO Chaoyang Renewable Power Co., Ltd., Shuweihat Asia Power Investment B.V., Shuweihat Asia Operation & Maintenance Company, Waterbury Lake Uranium L.P., ASM-BG Others (3 others) Korea Development Bank, Ulleungdo Natural Energy Co., Ltd., Garolim Tidal Power Plant Co., Ltd. (2) Transactions between the Company and its subsidiaries are eliminated during the consolidation and are not disclosed in notes. (3) Related party transactions for the years ended December 31, 2017, 2018 and 2019 are as follows: <Sales and Others> Sales and others Company name Transaction type 2017 2018 2019 In millions of won <Associates> Dongducheon Dream Power Co., Ltd. Electricity sales ￦ 17,041 6,093 7,071 Korea Gas Corporation Electricity sales 88,011 99,933 116,484 Daejung Offshore Wind Power Co., Ltd. Electricity sales 1 1 1 Daegu Photovoltaic Co., Ltd. Electricity sales 349 128 327 KS Solar Co., Ltd. Electricity sales 5 — — Heang Bok Do Si Photovoltaic Power Co., Ltd. Electricity sales 2 2 2 Korea Electric Power Industrial Development Co., Ltd. Service 14,044 10,422 11,085 Goseong Green Energy Co., Ltd. Electricity sales 24,069 10,024 19,245 Gangneung Eco Power Co., Ltd. Service 2,391 4,928 7,446 Shin Pyeongtaek Power Co., Ltd. Electricity sales 9,025 8,468 21,218 Naepo Green Energy Co., Ltd. Electricity sales 185 160 154 Noeul Green Energy Co., Ltd. Electricity sales 32 30 30 Samcheok Eco Materials Co., Ltd. Electricity sales 237 605 627 YTN Co., Ltd. Electricity sales 1,987 2,043 2,257 Busan Green Energy Co., Ltd. Electricity sales 120 19 18 Gunsan Bio Energy Co., Ltd. Electricity sales — 3,611 4,755 Korea Electric Vehicle Charging Service Electricity sales 700 578 1,029 Tamra Offshore Wind Power Co., Ltd. Electricity sales ￦ 55 58 — Daegu clean Energy Co., Ltd. Electricity sales 421 126 — Cheongna Energy Co., Ltd. Service 7,980 11,688 9,922 Gangwon Wind Power Co., Ltd. Electricity sales 994 2,402 2,433 Gwangyang Green Energy Co., Ltd. Electricity sales — 874 122 Hyundai Green Power Co., Ltd. Design service 14,280 14,031 13,106 Korea Power Exchange Service 8,446 6,854 7,670 Hyundai Energy Co., Ltd. Service 15,627 1,718 3,437 Taebaek Wind Power Co., Ltd. Service 813 614 991 Taeback Guinemi Wind Power Co., Ltd. Electricity sales — — 77 Pyeongchang Wind Power Co., Ltd. Design service 1,176 1,166 1,189 Daeryun Power Co., Ltd. Electricity sales 1,796 1,731 1,879 Changjuk Wind Power Co., Ltd. Electricity sales 788 758 927 GS Donghae Power Co., Ltd. Electricity sales 11,204 7,238 15,792 KNH Solar Co., Ltd. Electricity sales 17 17 17 S-Power Service 12,852 9,118 6,535 PND solar Co., Ltd Electricity sales — 12 407 Hyundai Ecoenergy Co., Ltd. Electricity sales — — 117 YeongGwang Yaksu Wind Electric. Co., Ltd. Electricity sales — — 81 Korea Energy Solution Co., Ltd. Electricity sales — — 52 Suwon New Power Co., Ltd. Electricity sales — — 5,606 9 Associates (Overseas) Electricity sales and others 21,864 60,318 98,450 <Joint ventures> Daegu Green Power Co., Ltd. Electricity sales 1,131 1,022 1,151 KAPES, Inc. Commission 1,420 648 504 Dangjin Eco Power Co., Ltd. Technical fee 670 3,424 4 Honam Wind Power Co., Ltd. Electricity sales 552 415 657 Jeongam Wind Power Co., Ltd. Electricity sales 30 724 1,198 Korea Power Engineering Service Co., Ltd. Service 1,317 840 348 Seokmun Energy Co., Ltd. Service 1,765 1,897 1,495 Incheon New Power Co., Ltd. Construction revenue 539 568 354 Chun-cheon Energy Co., Ltd. Electricity sales 4,855 2,471 2,397 Yeonggwangbaeksu Wind Power Co., Ltd. Electricity sales 1,654 1,540 1,744 Yeonggwang Wind Power Co., Ltd. Electricity sales — 46 705 KW Nuclear Components Co., Ltd. Service 644 839 721 KEPCO-Uhde Inc. Service 34 17 15 Busan Shinho Solar Power Co., Ltd. Electricity sales 87 362 452 Daesan Green Energy Co., Ltd. Electricity sales — — 39 Cheong-Song Noraesan Wind Power Co., Ltd. Electricity sales — — 6 Saemangeum Solar Power Co., Ltd. Service — — 2,230 Jaeun Resident Wind Power Plant Co., Ltd. Electricity sales — — 105 25 Joint ventures (Overseas) Electricity sales and others 131,343 206,054 1,275,279 <Others> Yeongwol Energy Station Co., Ltd. Service 830 373 — DS POWER Co., Ltd. Service 5,819 565 — Ulleungdo Natural Energy Co., Ltd. Service 1,013 292 — Korea Development Bank Electricity sales 3,239 3,524 3,948 Interest income 1,685 4,438 2,091 <Purchase and Others> Purchase and others Company name Transaction type 2017 2018 2019 In millions of won <Associates> Dongducheon Dream Power Co., Ltd. Electricity purchase ￦ 813,440 828,547 689,510 Korea Gas Corporation Purchase of power generation 3,245,519 5,191,243 4,049,486 Daegu Photovoltaic Co., Ltd. REC purchase 3,646 3,745 3,626 KS Solar Co., Ltd. REC purchase 900 — — Heang Bok Do Si Photovoltaic Power Co., Ltd. Rental fee and others 570 455 450 Korea Electric Power Industrial Development Co., Ltd. Electricity metering service 289,293 261,668 245,057 Goseong Green Energy Co., Ltd. Electricity purchase — — 32 Gangneung Eco Power Co., Ltd. Service — 19 — Shin Pyeongtaek Power Co., Ltd. Electricity purchase — — 119,162 Noeul Green Energy Co., Ltd. REC purchase 15,862 18,282 22,767 Samcheok Eco Materials Co., Ltd. Electricity purchase 14 3,819 9,425 YTN Co., Ltd. Electricity purchase 731 322 333 Busan Green Energy Co., Ltd. Electricity purchase 12,189 25,123 13,811 Gunsan Bio Energy Co., Ltd. Electricity purchase — — 3,022 Korea Electric Vehicle Charging Service Electricity purchase 1,093 605 536 Tamra Offshore Wind Power Co., Ltd. Electricity purchase 2,105 8,371 — Cheongna Energy Co., Ltd. Service 59 58 58,747 YaksuESS Co., Ltd Service — — 1,191 Gangwon Wind Power Co., Ltd. Electricity purchase 25,968 25,407 24,116 Hyundai Green Power Co., Ltd. Electricity purchase 458,378 480,815 507,662 Korea Power Exchange Trading Fees 207,855 137,489 120,509 Hyundai Energy Co., Ltd. Electricity purchase 87,607 3,445 2,847 Taebaek Wind Power Co., Ltd. REC purchase 6,534 8,582 7,070 Taeback Guinemi Wind Power Co., Ltd. Electricity purchase — — 349 Pyeongchang Wind Power Co., Ltd. Service 4,033 6,994 5,188 Daeryun Power Co., Ltd. Electricity purchase 146,189 184,063 144,862 Changjuk Wind Power Co., Ltd. Electricity purchase 6,981 7,929 6,994 GS Donghae Electric Power Co., Ltd. Electricity purchase 351,367 780,233 681,379 KNH Solar Co., Ltd. Electricity purchase 3,947 3,586 3,377 S-Power Electricity purchase 457,329 507,875 522,469 Hadong Mineral Fiber Co., Ltd. Service — 60 — Green Biomass Co., Ltd. Woodchip purchase 1,345 440 — YeongGwang Yaksu Wind Electric. Co., Ltd Electricity purchase — 2,437 6,511 PND solar., Ltd Service — — 557 Hyundai Ecoenergy Co., Ltd. Electricity purchase — — 6,810 Korea Energy Solution Co., Ltd. Electricity purchase — — 15 9 Associates (Overseas) Electricity purchase and 72 31 — <Joint ventures> Daegu Green Power Co., Ltd. Electricity purchase 252,024 287,008 296,464 KAPES, Inc. Service 164,165 77,758 142,511 Honam Wind Power Co., Ltd. Electricity purchase 5,962 7,700 5,306 Korea Power Engineering Service Co., Ltd. Service 1,292 1,765 1,774 Seokmun Energy Co., Ltd. REC purchase 21,674 31,759 26,370 Chun-cheon Energy Co., Ltd. REC purchase 194,136 320,954 313,471 Yeonggwangbaeksu Wind Power Co., Ltd. Electricity purchase 11,124 11,366 11,739 Yeonggwang Wind Power Co., Ltd. Electricity purchase — — 11,940 Busan Shinho Solar Power Co., Ltd. REC purchase 7,984 7,901 7,843 Global Trade Of Power System Co., Ltd. Service 414 565 502 Expressway Solar-light Power Generation Co., Ltd. Electricity purchase 2,941 3,513 3,067 25 Joint ventures (Overseas) Electricity purchase and 2,785 1,404 7,232 <Others> Yeongwol Energy Station Co., Ltd. REC purchase 14,256 4,019 — Ulleungdo Natural Energy Co., Ltd. Service 119 63 — Korea Development Bank Interest expense 4,573 5,043 4,063 Dividend paid 418,407 166,876 20 (4) Receivables and payables arising from related party transactions as of December 31, 2018 and 2019 are as follows: Receivables Payables Company name Type 2018 2019 2018 2019 In millions of won <Associates> Dongducheon Dream Power Co., Ltd. Trade receivables ￦ 332 323 — — Non-trade receivables and others 298 267 — — Trade payables — — 74,651 85,920 Non-trade payables and others — — 10 12 Korea Gas Corporation Trade receivables 9,439 9,267 — — Non-trade receivables and others 498 38 — — Trade payables — — 601,092 462,138 Non-trade payables and others — — 314 560 Daegu Photovoltaic Co., Ltd. Trade payables — — 83 69 Korea Power Engineering Service Co., Ltd. Trade receivables — 74 — — Korea Electric Power Industrial Development Co., Ltd. Trade receivables 278 243 — — Non-trade receivables and others 51 43 — — Trade payables — — — 3,756 Non-trade payables and others — — 13,102 3,827 Goseong Green Energy Co., Ltd. Trade receivables — 103 — — Non-trade receivables and others — 5,285 — — Non-trade payables and others — — 43,020 65,626 Gangneung Eco Power Co., Ltd. Trade receivables 1 115 — — Non-trade receivables and others 99 65 — — Shin Pyeongtaek Power Co., Ltd. Trade receivables 123 1,013 — — Non-trade receivables and others 242 2,281 — — Trade payables — — — 64,696 Non-trade payables and others — — 82 61 Naepo Green Energy Co., Ltd. Trade receivables 17 18 — — Noeul Green Energy Co., Ltd. Trade receivables 3 3 — — Non-trade payables and others — — 8,774 1,855 Samcheok Eco Materials Co., Ltd. Trade receivables 61 59 — — YTN Co., Ltd. Trade receivables 98 97 — — Non-trade payables and others — — 11 — Busan Green Energy Co., Ltd. Trade receivables 1 1 — — Non-trade payables and others — — 10,882 606 Gunsan Bio Energy Co., Ltd. Non-trade receivables and others 3,458 — — — Korea Electric Vehicle Charging Service Trade receivables 69 137 — — Non-trade receivables and others 354 529 — — Non-trade payables and others — — 56 — Daegu Clean Energy Co., Ltd. Non-trade receivables and others 17 — — — Cheongna Energy Co., Ltd. Trade receivables 183 1,074 — — Yaksu ESS Co., Ltd. Trade payables — — — 525 Gangwon Wind Power Co., Ltd. Trade receivables 10 7 — — Trade payables — — 2,547 2,979 Gwangyang Green Energy Co., Ltd. Non-trade receivables and others — 1,334 — — Hyundai Green Power Co., Ltd. Trade receivables 390 502 — — Trade payables — — 38,072 41,587 Korea Power Exchange Trade receivables 847 1,142 — — Non-trade receivables and others 229 114 — — Non-trade payables and others — — 1,214 4,160 Hyundai Energy Co., Ltd. Trade receivables 57 128 — — Non-trade receivables and others 9,664 12,532 — — Trade payables — — 259 175 Non-trade payables and others — — 8,021 9,178 Receivables Payables Company name Type 2018 2019 2018 2019 In millions of won <Associates> Ecollite Co., Ltd. Non-trade receivables and others ￦ 210 210 — — Taebaek Wind Power Co., Ltd. Trade payables — — 453 358 Non-trade — — 291 243 Taebaek Guinemi Wind Power Co., Ltd. Non-trade — 2 — — Trade payables — — — 190 Pyeongchang Wind Power Co., Ltd. Trade receivables 4 4 — — Non-trade — — 25 — Daeryun Power Co., Ltd. Trade receivables 178 144 — — Trade payables — — 15,845 19,843 Changjuk Wind Power Co., Ltd. Trade payables — — 455 447 Non-trade — — 273 280 GS Donghae Electric power Co., Ltd. Trade receivables 245 175 — — Non-trade receivables and others 2,537 367 — — Trade payables — — 69,820 69,811 Non-trade — — 59 16 KNH Solar Co., Ltd. Trade receivables 1 1 — — S-Power Trade receivables 922 89 — — Non-trade 34 43 — — Trade payables — — 56,897 53,705 Non-trade — — 16 — PND solar., Ltd. Trade receivables 3 — — — Hyundai Ecoenergy Co., Ltd. Trade receivables — 16 — — YeongGwang Yaksu Wind Electric. Co., Ltd. Trade receivables — 5 — — Trade payables — — 2,679 — Cheong-Song Noraesan Wind Power Co., Ltd. Trade receivables — 1 — — Suwon New Power Co., Ltd. Non-trade — 2,939 — — 4 Associates (Overseas) Non-trade 455 1,112 — — <Joint ventures> Daegu Green Power Co., Ltd. Trade receivables 110 113 — — Non-trade 12 1 — — Trade payables — — 32,609 28,980 KAPES, Inc. Trade receivables — 1 — — Non-trade 253 — — — Non-trade — — 338 50,738 Dangjin Eco Power Co., Ltd. Trade receivables — 2 — — Non-trade 18 — — — Honam Wind Power Co., Ltd. Trade payables — — 432 347 Non-trade — — 3,573 1,671 Jeongam Wind Power Co., Ltd. Trade receivables 151 165 — — Non-trade — — 2 6 Korea Power Engineering Service Co., Ltd. Non-trade — 74 — — Seokmun Energy Co., Ltd. Trade receivables ￦ 39 51 — — Non-trade 303 136 — — Non-trade — — 5,043 4,750 Incheon New Power Co., Ltd. Trade receivables 128 — — — Chun-cheon Energy Co., Ltd. Trade receivables 20 260 — — Non-trade 308 5,362 — — Trade payables — — 33,796 23,438 <Joint ventures> Yeonggwangbaeksu Wind Power Co., Ltd. Trade receivables 7 6 — — Non-trade — 157 — — Trade payables — — 736 671 Non-trade — — 789 1,526 Yeonggwang Wind Power Co., Ltd. Trade receivables 10 10 — — Non-trade — 54 — — Non-trade — — — 2,432 KW Nuclear Components Co., Ltd. Trade receivables 4 4 — — Non-trade receivables and others 31 15 — — KEPCO-Uhde Inc. Non-trade — — 4 9 Busan Shinho Solar Power Co., Ltd. Trade receivables 2 2 — — Trade payables — — 175 148 Non-trade — — 717 733 Daesan Green Energy Co., Ltd. Trade receivables — 6 — — Cheong-Song Noraesan Wind Power Co., Ltd. Trade receivables — 1 — — Saemangeum Solar Power Co., Ltd. Non-trade — 2,197 — — 14 Joint ventures (Overseas) Trade receivables 30,208 51,700 — — Non-trade 740 13,652 — — Non-trade — — 18,379 87,404 <Others> Korea Development Bank Accrued interest income 1,147 1,630 — — Non-trade 12,125 146,416 — — Non-trade — — 218 152 Derivatives 27,306 41,368 18,095 6,531 (5) Loans and others arising from related party transactions as of December 31, 2018 and 2019 are as follows: Type Company name Beginning Loans Collection Others Ending balance In millions of won Associates KNOC Nigerian East Oil Co., Ltd., KNOC Nigerian West Oil Co., Ltd. ￦ 27,634 132 — 910 28,676 (Allowance for doubtful accounts) (6,065 ) — — (1,260 ) (7,325 ) Associates PT. Cirebon Electric Power 8,696 — (8,900 ) 782 578 Associates Xe-Pian Xe-Namnoy 1,413 20,148 — (606 ) 20,955 Associates PT. Wampu Electric Power 14,880 — — 1,622 16,502 Associates Gunsan Bio Energy Co., Ltd. 9,396 3,000 — — 12,396 (Allowance for doubtful accounts) — (10,128 ) — — (10,128 ) Associates Hyundai Energy Co., Ltd. ￦ 2,465 — — — 2,465 (Allowance for doubtful accounts) (2,465 ) — — — (2,465 ) Joint ventures Recursos Solares PV de Mexico II SA DE CV — 1,054 — 1 1,055 Joint ventures Horus Solar SA DE CV — 3,320 — 3 3,323 Joint ventures SUNMEX RENOVABLES SA DE CV — 144 — — 144 Joint ventures Kelar S.A 48,694 — (8,320 ) 1,784 42,158 Joint ventures Chester Solar IV SpA — 1,688 (1,688 ) — — Joint ventures Chester Solar V SpA — 535 (535 ) — — Joint ventures Diego de Almagro Solar SpA — 2,101 (2,101 ) — — Joint ventures Chun-cheon Energy Co., Ltd. 616 4,441 — — 5,057 Joint ventures Dangjin Eco Power Co., Ltd. (before the spin-off) — 2,600 (2,600 ) — — Joint ventures DE energia SpA — 6,799 — (167 ) 6,632 Joint ventures Eumseong Natural Gas Power Co., Ltd.(*1) — 20,000 (20,000 ) — — ￦ 105,264 55,834 (44,144 ) 3,069 120,023 (*1) Eumseong Natural Gas Power Co., Ltd. was established by spin-off (6) Borrowings arising from related party transactions as of December 31, 2018 and 2019 are as follows: Related parties Type Beginning balance Borrowings Repayment Others Ending balance In millions of won Korea Development Bank Facility ￦ 66,793 5,700 (12,648 ) — 59,845 Others 4,154 — (654 ) — 3,500 Operating funds 81,000 172,442 (73,992 ) (450 ) 179,000 Syndicated Loan 17,277 — (1,055 ) 863 17,085 (7) Guarantees provided to associates or joint ventures as of December 31, 2019 are as follows: Primary guarantor Principal obligor Type of guarantees Credit limit Guarantee In millions of Korea Electric Power Corporation Shuweihat Asia Operation & Maintenance Company Performance guarantees USD 11,000 Shuweihat Asia Power Investment B.V. Korea Electric Power Corporation Rabigh Operation & Maintenance Company Limited Performance guarantees and others USD 1,387 Rabigh Electricity Company Korea Electric Power Corporation Nghi Son 2 Power LLC Performance guarantees USD 70,000 SMBC Ho Chi Minh and others Korea Electric Power Corporation Barakah One Company Debt guarantees USD 900,000 Export-Import Bank of Korea and others Performance guarantees and others USD 4,430,240 Korea Electric Power Corporation RE Holiday Holdings LLC Performance guarantees USD 223,000 EPS Renewables Holdings, LLC, Santander Bank and others Korea Electric Power Corporation RE Pioneer Holdings LLC Performance guarantees USD 170,000 EPS Renewables Holdings, LLC, Santander Bank and others Korea Electric Power Corporation RE Barren Ridge 1 Holdings LLC Performance guarantees USD 149,000 EPS Renewables Holdings, LLC, Santander Bank and others Korea Electric Power Corporation Rabigh Electricity Company Performance guarantees SAR 6,508 Hana Bank Korea Electric Power Corporation Debt guarantees SAR 80,000 Korea Electric Power Corporation Shuweihat Asia Power Investment B.V. Performance guarantees USD 100,000 ING Bank Korea Electric Power Corporation Amman Asia Electric Power Company Korea Western Power Co., Ltd. Cheongna Energy Co., Ltd. Collateralized money invested KRW 1,411 Hana Bank and others Guarantees for supplemental funding and others(*1) — Korea Western Power Co., Ltd. Xe-Pian Xe-Namnoy Payment guarantees for business reserve USD 2,500 Krung Thai Bank Collateralized money invested KRW 72,935 Impounding bonus guarantees USD 5,000 SK E&C Korea Western Power Co., Ltd. Rabigh Operation & Maintenance Company Limited Performance guarantees and others SAR 5,600 Saudi Arabia British Bank Korea Western Power Co., Ltd. Daegu Photovoltaic Co., Ltd. Collateralized money invested KRW 2,060 Korea Development Bank Korea Western Power Co., Ltd. Dongducheon Dream Power Co., Ltd. Collateralized money invested(*7) KRW 41,531 Kookmin Bank and others Debt guarantees KRW 20,300 BNK Securities and others Korea Western Power Co., Ltd. PT. Mutiara Jawa Collateralized money invested KRW 1,438 Woori Bank Nonghyup Bank Korea Western Power Co., Ltd. Haeng Bok Do Si Photovoltaic Power Co., Ltd. Collateralized money invested KRW 215 Korea Western Power Co., Ltd. Shin Pyeongtaek Power Co., Ltd. Collateralized money invested KRW 66,956 Kookmin Bank Guarantees for supplemental funding(*1) — Kookmin Bank and others Korea East-West Power Co., Ltd. Busan Shinho Solar Power Co., Ltd. Collateralized money invested KRW 5,045 Korea Development Bank and others Korea East-West Power Co., Ltd. Seokmun Energy Co., Ltd. Collateralized money invested KRW 17,342 Kookmin Bank and others Guarantees for supplemental funding(*1) — Korea East-West Power Co., Ltd. Chun-cheon Energy Co., Ltd. Collateralized money invested KRW 34,872 Kookmin Bank and others Guarantees for supplemental funding(*1) KRW 20,000 Korea East-West Power Co., Ltd. Honam Wind Power Co., Ltd. Collateralized money invested KRW 4,375 Shinhan Bank and others Guarantees for supplemental funding(*1) — Korea East-West Power Co., Ltd. GS Donghae Electric Power Co., Ltd. Collateralized money invested KRW 255,983 Korea Development Bank and others Guarantees for supplemental funding(*1) — Korea East-West Power Co., Ltd. Yeonggwangbaeksu Wind Power Co., Ltd. Collateralized money invested KRW 3,040 Kookmin Bank and others Korea East-West Power Co., Ltd. Yeonggwang Wind Power Co., Ltd. Collateralized money invested KRW 17,627 KDB Capital Corporation and others Guarantees for supplemental funding(*1) — Korea East-West Power Co., Ltd. Daesan Green Energy Co., Ltd. Collateralized money invested KRW 17,182 IBK Guarantees for supplemental funding(*1) KRW 18,989 IBK Korea East-West Power Co., Ltd. Taebaek Gadeoksan Wind Power Co., Ltd. Collateralized money invested KRW 7,846 Samsung Fire & Marine Insurance Co., Ltd. and others Korea East-West Power Co., Ltd. PT. Tanjung Power Indonesia Debt guarantees USD 24,544 Sumitomo Mitsui Banking Corporation Other guarantees USD 3,150 PT Adaro Indonesia Guarantees for supplemental funding(*1) — Sumitomo Mitsui Banking Corporation and others Collateralized money invested KRW 34,327 MUFG and others Korea East-West Power Co., Ltd. South Jamaica Power Company Limited Performance guarantees USD 14,400 Societe Generale Collateralized money invested KRW 13,863 JCSD Trustee Services Limited and others EWP Barbados 1 SRL South Jamaica Power Company Limited Guarantees for supplemental funding(*1, 3) — JCSD Trustee Services Limited and others Korea East-West Power Co., Ltd. DE Energia SpA Collateralized money invested KRW 8,665 Mirae Asset Daewoo Co., Ltd. and others Korea East-West Power Co., Ltd. Debt guarantees KRW 6,632 Korea Southern Power Co., Ltd. KNH Solar Co., Ltd. Collateralized money invested KRW 2,382 Shinhan Bank and Kyobo Life Insurance Co., Ltd. Performance guarantees and guarantees for supplemental funding(*1) — Korea Southern Power Co., Ltd. Daeryun Power Co., Ltd. Collateralized money invested KRW 26,247 Korea Development Bank and others Guarantees for supplemental funding and others(*1) KRW 8,000 Korea Southern Power Co., Ltd. Daegu Green Power Co., Ltd. Collateralized money invested KRW 22,824 Shinhan Bank and others Performance guarantees — Korea Southern Power Co., Ltd. Kelar S.A Performance guarantees USD 61,692 Hana Bank, MUFG Korea Southern Power Co., Ltd. Daehan Wind Power PSC Debt guarantees(*9) USD 16,000 Shinhan Bank Performance guarantees USD 3,600 Debt guarantees(*9) USD 240 Performance Debt guarantees(*9) USD 1,898 Hana Bank Korea Southern Power Co., Ltd. Pyeongchang Wind Power Co., Ltd. Collateralized money invested KRW 5,877 Woori Bank and Shinhan Bank and others Performance guarantees — Korea Southern Power Co., Ltd. Taebaek Guinemi Wind Power Co., Ltd. Collateralized money invested KRW 2,553 IBK Guarantees for supplemental funding(*1) — Korea Southern Power Co., Ltd. Jeongam Wind Power Co., Ltd. Guarantees for supplemental funding(*1) and performance guarantees — SK Securities.Co., LTD., KDB Capital Corporation, and others Collateralized money invested KRW 4,437 Korea Southern Power Co., Ltd. Taebaek Wind Power Co., Ltd. Guarantees for supplemental funding(*1) — Shinhan Bank and others Korea Southern Power Co., Ltd. Samcheok Eco Materials Co., Ltd. Payment guarantees(*4,7) — SEM Investment Co., Ltd. Kospo Chile SpA Kelar S.A. Collateralized money invested KRW 70,462 Export-Import Bank of Korea and others Chester Solar I SpA Collateralized money invested KRW 1,157 IBK Chester Solar IV SpA Collateralized money invested KRW 672 Chester Solar V SpA Collateralized money invested KRW 146 Diego de Almagro Solar Spa Collateralized money invested KRW 1,035 Laurel SpA Collateralized money invested KRW 595 Korea Midland Power Co., Ltd. YeongGwang Yaksu Wind Electric. Co., Ltd. Collateralized money invested KRW 386 IBK and others Korea Midland Power Co., Ltd. Hyundai Green Power Co., Ltd. Collateralized money invested KRW 124,253 Korea Development Bank and others Korea Midland Power Co., Ltd. PT. Cirebon Electric Power Debt guarantees USD 11,248 Mizuho Bank Korea Midland Power Co., Ltd. PT. Wampu Electric Power Debt guarantees USD 4,854 SMBC Korea Midland Power Co., Ltd. Green Energy Electricity Generation Co., Ltd. Collateralized money invested KRW 163 IBK Guarantees for supplemental funding and others(*1) — IBK and others Korea Midland Power Co., Ltd. YaksuESS Co., Ltd. Collateralized money invested KRW 516 IBK Korea Midland Power Co., Ltd. Namjeongsusang Solar Power Operatin Co., Ltd. Collateralized money invested KRW 812 IBK Korea Midland Power Co., Ltd. Gwangbaek Solar Power Investment Co., Ltd. Collateralized money invested KRW 2,054 IBK Korea South-East Power Co., Ltd. Hyundai Energy Co., Ltd. Collateralized money invested(*5) — IBK Guarantees for supplemental funding and others(*1,6) KRW 76,800 NH investment & securities Co., Ltd. and others Korea South-East Power Co., Ltd. S-Power Collateralized money invested KRW 115,784 Korea Development Bank and others Korea South-East Power Co., Ltd. RES Technology AD Collateralized money invested KRW 16,248 UniCredit Bulbank and others Korea South-East Power Co., Ltd. ASM-BG Collateralized money invested KRW 19,376 UniCredit Bulbank and others Korea South-East Power Co., Ltd. Expressway Solar-light Power Generation Co., Ltd. Guarantees for supplemental funding(*1,2) KRW 2,500 Woori Bank Korea South-East Power Co., Ltd. Goseong Green Energy Co., Ltd. Collateralized money invested KRW 2,340 Kyobo Life Insurance Co., Ltd. and others Korea South-East Power Co., Ltd. Gangneung Eco Power Co., Ltd. Collateralized money invested KRW 2,430 Kyobo Life Insurance Co., Ltd. and others Korea South-East Power Co., Ltd. PND solar., Ltd. Collateralized money invested KRW 1,144 IBK Korea South-East Power Co., Ltd. Hyundai Eco Energy Co., Ltd. Collateralized money invested KRW 3,781 Samsung Life Insurance and others Korea South-East Power Co., Ltd. Jaeun Resident Wind Power Plant Co., Ltd. Collateralized money invested KRW 2,198 IBK Korea South-East Power Co., Ltd. Cheongsong Myeonbongsan Wind Power Plant Co., Ltd. Collateralized money invested KRW 2,764 Kyobo Life Insurance Co., Ltd. and others Korea Hydro & Nuclear Power Co., Ltd. Noeul Green Energy Co., Ltd. Collateralized money invested KRW 6,611 Hana Bank and others Guarantees for supplemental funding(*1) — Korea Hydro & Nuclear Power Co., Ltd. Busan Green Energy Co., Ltd. Collateralized money invested KRW 10,636 Shinhan Bank and others Korea Hydro & Nuclear Power Co., Ltd. Cheong-Song Noraesan Wind Power Co., Ltd. Collateralized money invested KRW 3,044 Woori Bank and others Guarantees for supplemental funding(*1) — KEPCO Plant Service & Engineering Co., Ltd. Incheon New Power Co., Ltd. Collateralized money invested(*8) — Shinhan Bank Guarantees for supplemental funding(*1) — (*1) The Company guarantees to provide supplemental funding for business with respect to excessive business expenses or insufficient repayment of borrowings. (*2) The Company has granted the right to Hana Financial Investment Co., Ltd., as an agent for the creditors to Expressway Solar-light Power Generation Co., Ltd. (“ESPG”), to the effect that in the event of acceleration of ESPG’s payment obligations under certain borrowings to such creditors, Hana Financial may demand the Company to dispose of shares in ESPG held by the Company and apply the resulting proceeds to repayment of ESPG’s obligations. (*3) This includes a guarantee for the shareholder’s capital payment in connection with the business of 190MW gas complex thermal power plant in Jamaica. EWP Barbados 1 SRL’s capital contribution amount is USD 18,400,000 and there is no residual guarantee amount among total collateral limit. (*4) Controlling and non-controlling pre-emption (*5) The Company recognized an impairment loss on all of the equity securities of Hyundai Energy Co., Ltd. in prior years, and the acquisition cost of the securities provided as collateral is ￦47,067 million. (*6) Pursuant to the guarantee agreement, the Company recognized other provisions of ￦28,717 million as the possibility of economic benefit outflow to fulfill the obligation was deemed probable and the amount could be reasonably estimated. (*7) The common stocks of Dongducheon Dream Power Co., Ltd. held by the Company were pledged as collateral. (*8) The Company recognized an impairment loss on all of the equity securities of Incheon New Power Co., Ltd. during the year ended December 31,2019, and the acquisition cost of the securities provided as collateral is ￦461 million. (*9) The Company provided a payment guarantee to Daehan Wind Power PSC for reimbursement of Equity Bridge Loan(EBL), opening LC for Debt Service Reserve Account(DSRA), guarantee for the swap termination costs and others. (8) As of December 31, 2019, there is no financial guarantee contract provided by related parties. (9) Derivatives transactions with related parties as of December 31, 2019 are as follows: (i) Currency Swap Counterparty Contract Contract Amount Contract interest rate per annum Contract exchange rate Pay Receive Pay (%) Receive (%) In millions of won and thousands of foreign currencies Korea Development Bank 2019~2024 ￦ 177,600 USD 150,000 1.24 % 2.50 % ￦ 1,184.00 2015~2025 111,190 USD 100,000 2.62 % 3.25 % 1,111.90 2017~2027 111,610 USD 100,000 2.31 % 3.13 % 1,116.10 2018~2028 108,600 HKD 800,000 2.69 % 3.35 % 135.75 2018~2023 170,280 USD 150,000

Non-Cash Transactions

Non-Cash Transactions	12 Months Ended
	Dec. 31, 2019
Non-Cash Transactions [Abstract]
Non-Cash Transactions	48. Non-Cash (1) Significant non-cash Transactions 2017 2018 2019 In millions of won Transfer from construction-in-progress ￦ 13,676,233 8,656,252 14,052,094 Recognition of asset retirement cost and related provision for decommissioning costs 2,494,802 310,272 2,425,668 Transfer from provision for disposal of spent nuclear fuel to accrued expenses 342,861 482,699 376,103 Transfer from long-term borrowings and debt securities to current portion of long-term borrowings and debt securities — 7,100,846 7,759,284 Transfer of right-of-use — — 5,364,647 (2) Changes in liabilities incurred from financing activities for the years ended December 31, 2018, and 2019 are as follows: 2018 Non-cash Beginning Cash flows Increase Changes in Effect of Increase Ending balance In millions of won Borrowings and debt securities ￦ 54,747,392 5,972,336 — — 314,899 — 61,034,627 Finance lease liabilities 418,260 (134,454 ) — — — — 283,806 ￦ 55,165,652 5,837,882 — — 314,899 — 61,318,433 2019 Non-cash Beginning Cash flows Increase Changes in Effect of Increase Ending balance In millions of won Borrowings and debt securities ￦ 61,034,626 6,342,074 — — 496,940 2,900 67,876,540 Lease liabilities 283,806 (573,437 ) 218,800 4,943,584 197,380 — 5,070,133 ￦ 61,318,432 5,766,877 218,800 4,943,584 694,080 2,900 72,946,673

Commitments for Expenditure

Commitments for Expenditure	12 Months Ended
	Dec. 31, 2019
Commitments for Expenditure [Abstract]
Commitments for Expenditure	49. Commitments for Expenditure (1) The commitments for acquisition of property, plant and equipment as of December 31, 2018 and 2019 are as follows: 2018 2019 Contracts Amounts Balance Amounts Balance In millions of won Purchase of cable (PVC, 1C, 2000SQ) 153,000M and others (Shin-Bupyung-Youngseo) ￦ 56,183 37,309 56,408 24,721 Purchase of cable (PVC, 1C, 2500SQ) 103,374M and others (Bukdangjin-Shin-Tangjung) 44,315 31,801 45,390 32,876 Purchase of GIS (362kV, 6300A, 63kA) 23CB – Youngseo S/S 34,500 34,500 36,143 36,143 Purchase of GIS (362kV, 6300A, 63kA) 26CB – Hwasung S/S 29,143 18,194 40,010 15,300 Purchase of GIS (362kV, 6300A, 63kA) 27CB – Kwangyang S/S 37,694 10,491 37,744 9,700 Purchase of Concrete Poles (10M, 350KGF) 121,900 and 6 others 133,387 13,343 — — Purchase of cable (TR CNCE-W/AL, 66,240 38,998 66,240 — Purchase of cable (FR CNCO-W, 57,475 48,598 59,716 37,249 Purchase of switch (Eco) 9,360 units 40,631 34,797 40,631 24,031 Purchase of cable (TR CNCE-W/AL, — — 36,063 6,243 Construction of Shin-Kori units (#3,4) 7,363,514 3,211 7,498,951 — Construction of Shin-Kori units (#5,6) 8,625,387 5,930,099 8,625,387 4,479,956 Construction of Shin-Hanul units (#1,2) 7,982,342 355,704 8,306,149 — Other 27 contracts 269,681 161,243 352,710 122,890 Service of designing Seoul Combined units (#1,2) 29,996 4,744 30,778 2,119 Purchase of main machine for construction of Seoul Combined units (#1,2) 365,164 51,165 331,249 15,918 Construction of Seoul Combined units (#1,2) 285,890 27,125 387,722 31,150 Purchase of smoke eliminating machine for construction of Shin-Boryeong units (#1,2) 172,609 13,986 157,618 — Service of designing Shin-Boryeong units (#1,2) 120,199 1,076 120,668 888 Purchase of main machine for construction of Shin-Boryeong units (#1,2) 866,065 4,981 816,317 4,955 Purchase of furnace for construction of Shin-Seocheon thermal power plant 305,209 74,631 305,209 43,388 Purchase of turbine generator for construction of Shin-Seocheon thermal power plant 104,402 57,968 105,226 10,736 Electricity construction of Shin-Seocheon thermal power plant 217,848 174,122 231,196 87,874 Purchase of main machine for Jeju LNG combined 166,287 11,272 166,287 12,088 Service of designing Taean IGCC plant units 46,001 3,161 46,101 2,332 Service of designing Taean units (#9,10) 112,344 13,338 112,483 12,862 Purchase of furnace for construction of Taean units (#9,10) 556,504 18,502 556,206 17,579 Purchase of turbine generator for construction of Taean units (#9,10) 214,462 10,422 214,208 10,857 Purchase of coal handling machine for construction of Taean (#9,10) and IGCC units (conditional contract for installation) 205,764 282 205,764 282 Purchase of oxygen plant for construction of Taean IGCC units 96,068 1,552 97,345 1,630 Purchase of gas turbine and turbine equipment of Gimpo combined heat & power plant — — 104,600 104,600 Purchase of coal handling machine for construction of Samcheok units (#1,2) 307,925 48,736 282,927 42,785 Purchase of furnace for construction of Samcheok units (#1,2) 1,092,287 12,215 1,066,824 11,771 Purchase of turbine main equipment for Samcheok units (#1,2) 212,188 348 223,550 132 Purchase of main equipment for Namjeju 146,594 134,949 138,486 84,982 (2) As of December 31, 2019, details of contracts for inventory purchase commitment are as follows: The Company imports all of its uranium ore concentrates from sources outside Korea (including the United States, United Kingdom, Kazakhstan, France, Russia, South Africa, Canada and Australia) which are paid for with currencies other than Won, primarily in U.S. dollars. In order to ensure stable supply, the Company entered into long-term and medium-term contracts with various suppliers, and supplements such supplies with purchases of fuels on spot markets. The long-term and medium-term contract periods vary among contractors and the stages of fuel manufacturing process. Contract prices for processing of uranium are generally based on market prices. Contract periods for ore concentrates, conversion, enrichment and design and fabrication are as follows: Type Periods Contracted quantity Concentrate 2019 ~ 2030 38,990 Ton U3O8 Transformed 2019 ~ 2030 21,969 Ton U Enrichment 2019 ~ 2030 17,060 Ton SWU Molded (Light) 2019 ~ 2020 756 Ton U Molded (Medium)) 2019 ~ 2020 401 Ton U Molded (Initial core) 2019 ~ 2022 415 Ton U

Contingencies and Commitments

Contingencies and Commitments	12 Months Ended
	Dec. 31, 2019
Contingencies and Commitments [Abstract]
Contingencies and Commitments	50. Contingencies and Commitments (1) Ongoing litigations and claims related with contingent liabilities and contingent assets as of December 31, 2018 and 2019 are as follows: 2018 2019 Number Claim Number Claim In millions of won As the defendant 570 ￦ 673,882 586 ￦ 697,835 As the plaintiff 174 793,491 199 707,287 As of December 31, 2019, among the litigations mentioned above, there are ongoing litigations of KHNP, a subsidiary of KEPCO, against KEPCO Engineering & Construction Company, Inc., a subsidiary of KEPCO, as a co-defendant A group of plaintiffs (consisting of 2,167 individuals) filed a lawsuit against NSSC (Nuclear Safety and Security Commission) regarding NSSC’s approval on May 18, 2015 of extending the operation of Wolsong unit 1 nuclear power plant. The appeal was ongoing as of December 31, 2019. Also, Greenpeace and others filed an administrative litigation against NSSC requesting cancelation of the construction permit of Shin-Kori unit 5 and 6 in September 12, 2016 and lost the lawsuit in February 14, 2019. They appealed the case in March 18, 2019. The Company joined these litigations as a stakeholder after obtaining permission from the Court. As of December 31, 2019, in connection with Shin-Hanul unit 3 & 4, the Company has received communications from a vendor for costs incurred for the preliminary work of the main equipment and associated compensation due to the discontinuation of the construction. The Company does not believe that it has a present obligation to this vendor, and that it is probable that the Company will prevail if a lawsuit is filed against the Company. In addition, the Company cannot reliably estimate the potential economic outflow related to the obligation as of December 31, 2019. The long-term service contract between Gyeonggi Green Energy Co., Ltd. (Gyeonggi Green Energy) and its fuel cell supplier expired during the year ended December 31, 2018. Gyeonggi Green Energy had been in negotiations to renew the contract as the creditors requested, and, as a result, Gyeonggi Green Energy renewed the long-term service contract with fuel cell supplier on August 30, 2019. Accordingly, the Company has obtained approval from the creditors for long-term service contracts with the fuel cell supplier. The Company is the defendant against a number of claims. The following is potentially significant ongoing claims pertaining to the Company: In December 2013, the Supreme Court of Korea ruled that regular bonuses also fall under the category of ordinary wages on the condition that those bonuses are paid regularly and uniformly. Also, the Supreme Court ruled that employees are entitled to retroactively demand certain wages based on the new ordinary wages that include regular bonuses as additional wages. However, the request may be limited to the extent of the principle of good faith. The Company believes that the possibility of economic benefit outflow is probable on the ongoing and the expected lawsuit. For this reason, the Company recognized ￦28,579 million of other provision in relation to the lawsuit as of December 31, 2019. In addition to the abovementioned significant ongoing claims, there are 15 arbitration cases pertaining to the Company as of December 31, 2019 and the significant arbitration cases for the year ended December 31, 2019 are as follows: ① KEPCO and KEPCO KDN Co., Ltd., a subsidiary of KEPCO, have been accused of breach of contract in relation to ERP software, which is provided by SAP Korea Ltd. The litigation was filed in the International Chamber of Commerce International Court of Arbitration, but the Company has not recognized any provision because the probability of economic benefit outflow is remote and the related amount cannot be reliably estimated. ② In 2016, Hyundai E&C, GS Engineering & Construction Corp. and Hansol SeenTec Co., Ltd. filed an arbitration against the Company to the Korea Commercial Arbitration Board in relation to the request for additional construction costs. As described in Note 26.(2), the Company recognized the litigation provisions of ￦204,787 million in relation to this arbitration case and made the payment according to the results of this arbitration during the year ended December 31, 2018. ③ In 2016, Halla Corporation filed an arbitration against the Company to the Korea Commercial Arbitration Board in relation to the request for additional construction costs and the Company filed an arbitration against Halla Corporation to the Korea Commercial Arbitration Board in relation to the request for a penalty payment for the delayed construction work. The Company has recognized ￦19,754 million as a provision for the best estimate of the expenditure required to fulfill its obligations in relation to this arbitration as of December 31, 2019. After the reporting period, the Company has recognized reversal of the provision amounting to ￦19,754 million according to the settlement from the authority. ④ The Company has filed for arbitration against IL KWANG E&C Co., Ltd. to the Korea Commercial Arbitration Board, in relation to damage claims received as of December 31, 2019. ⑤ In relation to the electric power IT modernization project in Kerala, India, Enzen, a subcontractor, filed an arbitration against the Company to the Indian Council of Arbitration due to disagreements in the contract, but the Company has not recognized any provision because the amount and timing of economic benefit outflow cannot be reasonably estimated. (2) Guarantees of payments and commitments provided to other companies as of December 31, 2018 and 2019 are as follows: ① The Company has outstanding borrowings with a limit of USD 275,600 thousand from its creditors such as International Finance Corporation. Regarding the borrowing contract, the Company has guaranteed capital contribution of USD 69,808 thousand and additional contribution up to USD 19,000 thousand for contingencies, if any. Moreover, for one of the electricity purchasers, Central Power Purchasing Agency Guarantee Ltd., the Company has provided payment guarantee up to USD 2,777 thousand, in case of construction delay or insufficient contract volume after commencement of the construction. ② The Company has provided PT. Perusahaan Listrik Negara performance guarantee up to USD 2,293 thousand and investment guarantee up to USD 43,500 thousand to Mizuho bank and others in proportion to its ownership in the electricity purchase contract with PT. Cirebon Energi Prasarana in relation to the second electric power generation business in Cirebon, Indonesia. ③ The Company has provided MUFG Bank, Ltd. (MUFG) (formerly, the Bank of Tokyo Mitsubishi UFJ. Ltd. (BTMU)) borrowing guarantee up to USD 41,258 thousand proportion to its ownership in the equity bridge loan guarantee with PT. Cirebon Energi Prasarana in relation to the second electric power generation business in Cirebon, Indonesia. ④ The Company has provided the Export-Import Bank of Korea, BNP Paribas and ING Bank guarantee of mutual investment of USD 2,192 thousand, which is equivalent to the ownership interest of PT BS Energy and PT Nusantara Hydro Alam, in order to guarantee the expenses related to hydroelectric power business of Tanggamus, Indonesia. ⑤ The Company has provided the Export-Import Bank of Korea and SMBC guarantee of mutual investment of USD 401 thousand, which is equivalent to the ownership interest of PT Mega Power Mandiri, in order to guarantee the expenses related to hydroelectric power business of PT. Wampu Electric Power, an associate of the Company. ⑥ The Company provides the DekaBank with an investment guarantee of EUR 13,800 thousand to Stavro Vind AB, to enter into a loan contract for the Sweden Wind Power (Stavro) construction operation project. ⑦ The Company is obligated to complete the construction of the waste oil refining for power generation business of Next energy Co.,Ltd. (contract amount : ￦14,700 million) as a construction company. The Company is liable to compensate to financial institution agents for the liquidated damages in case of incompletion of the construction. Also, the Company has made performance guarantee agreement with Next energy Co.,Ltd. after the completion of the construction, which obliges the Company to provide supplemental funding if the amount of power generated or the operation time of the power plant does not reach the agreed level. The Company expected outflow of resources is probable due to guarantee of completing the construction. Hence, the Company recognized revenue over time after deducting ￦5,244 million as the variable consideration for the contract amount of the project. (3) Credit lines provided by financial institutions as of December 31, 2019 are as follows: Commitments Financial institutions Currency Limited amount Used amount In millions of won and thousands of foreign Commitments on Bank-overdraft Nonghyup Bank and others KRW 1,825,500 373,219 Commitments on Bank-daylight overdraft Nonghyup Bank and others KRW 280,000 — Limit amount available for CP Hana Bank and others KRW 1,250,000 1,150,000 Limit amount available for card Hana Bank and others KRW 51,904 6,686 Banco de Oro PHP 5,000 3,000 Loan limit Kookmin Bank and others KRW 1,050,503 685,429 DBS Bank and others USD 2,492,700 14,400 Certification of payment on payables from foreign country Nonghyup Bank USD 4,680 3,892 Certification of payment on L/C Shinhan Bank KRW 7,749 — Shinhan Bank and others USD 1,051,334 171,975 Societe Generale MYR 2,500 2,500 Certification of Performance guarantee on contract Seoul Guarantee Insurance and others KRW 84,011 66,892 First Abu Dhabi Bank and others USD 596,862 465,093 Korea Development Bank and others JPY 637,495 637,495 Hana Bank and others EUR 4,158 4,158 Hana Bank and others INR 191,883 191,883 Hana Bank CAD 464 464 Shinhan Bank ZAR 55,730 55,730 Certification of bidding Hana Bank USD 10,000 197 Advance payment bond, Warranty bond, Retention bond and others Seoul Guarantee Insurance KRW 44,047 44,047 Export-Import Bank of Korea and others USD 714,654 649,402 Hana Bank SAR 86,508 86,508 SMBC Bank QAR 15,000 15,000 Others Nonghyup Bank and others KRW 537,064 47,638 Export-Import Bank of Korea and others USD 1,562,194 1,315,378 Shinhan Bank JPY 381,210 381,210 Standard Chartered AED 50 50 Inclusive credit Hana Bank KRW 8,000 772 Hana Bank and others USD 30,975 17,502 Shinhan Bank INR 92,348 92,348 Trade finance BNP Paribas and others USD 700,000 — (4) As of December 31, 2019, blank check and assets provided as collaterals or pledges to financial institutions by the Company are follows: Guarantor Guarantee Type of guarantee Currency Amount Description In millions of won and thousands of foreign currencies Mira Power Limited International Finance Corporation and others Property, plant and equipment and others USD 275,600 Collateral for borrowings(*1) Tamra Offshore Wind Power Co., Ltd. Kyobo Life Insurance Co., Ltd. and others Property, plant and equipment and others KRW 171,600 Collateral for borrowings(*2) SE Green Energy Co., Ltd. DB Insurance Co., Ltd. and others Property, plant and equipment and others KRW 149,500 Collateral for borrowings(*2) Gyeonggi Green Energy Co., Ltd. Korea Development Bank and others Cash and cash equivalents KRW 327,080 Collateral for borrowings(*2) Commerce and Industry Energy Co., Ltd. IBK and others Land, buildings, structures and machinery and others KRW 110,500 Collateral for borrowings(*2) KOSPO Youngnam Power Co., Ltd. Shinhan Bank and others Cash and cash equivalents KRW 396,120 Collateral for borrowings(*2) Gyeongju Wind Power Co., Ltd. Samsung Fire & Marine Insurance Co., Ltd. and Others Property, plant and equipment and others KRW 110,240 Collateral for borrowings (*2) Korea Offshore Wind Power Co., Ltd. Woori Bank and Others Utility plant and others KRW 293,400 Collateral for borrowings(*2) Qatrana Electric Power Company The Islamic Development Bank and others Finance lease receivable and property, plant and equipment and others JOD 236,570 Collateral for borrowings(*1) KST Electric Power Company The Export—Import Bank of Korea and others Finance lease receivable and property, plant and equipment and others USD 401,277 Collateral for debt securities(*1) (*1) This is based on the amount of loan commitment limit. (*2) As of December 31, 2019, the Company has established guarantees for pledge for transfer of rights of long-term borrowings, pledge for insurance claims, pledge for shares, etc. The Company has ￦1,197 million of project loans from Korea Energy Agency as of December 31, 2019. The Company has provided a blank check as a repayment guarantee. (5) The Company temporarily suspended operations of the Gangneung hydroelectric generating plant, with a carrying amount of ￦75,634 million as of December 31, 2019, to improve the quality of water used in generating electricity. The expenses related to the suspension of operations of ￦49 million and depreciation on the idle assets of ￦6,542 million are recorded in other expenses for the year ended December 31, 2019. Regarding the improvement of water quality, the results of damages compensation for the local residents cannot be reasonably estimated, and the Company is in negotiations with Gangneung City and related stakeholders to restart the Gangneung hydroelectric generating plant as of December 31, 2019. (6) Due to the Korean government’s announcement of suspension of operation in the Gaeseong Industrial District, it is uncertain if the Company can exercise the property rights for the Company’s facility in the Gaeseong Industrial District as of December 31, 2019. The book value of facility is ￦16,611 million and the amount of trade receivables related to the companies residing in Gaeseong industrial complex is ￦2,911 million. The outcome of this event cannot be reasonably estimated as of December 31, 2019. (7) In connection with the electric power IT modernization project in Kerala, India, negotiations are underway due to disagreements in the contract regarding the existence and the scope of a warranty obligation. However, the Company has not recognized any provision because the amount and timing of economic benefit outflow cannot be reasonably estimated as of December 31, 2019. 51. Business Combination (1) The details of business combinations that occurred for the year ended December 31, 2019 are as follows: Company Key operation Date of Transfer In millions of won Eumseong Natural Gas Power Co., Ltd. Power generation 2019.12.23 225,758 Eumseong Natural Gas Power Co., Ltd. was established in August 2019 by spin-off (2) Details of the transfer price at fair value given by the acquirer of the business combination for the year ended December 31, 2019 are as follows: Type Amounts In millions of won Cash and cash equivalents ￦ 156,700 Other trade payables 10,000 Fair value of the shares owned before the acquisition 59,058 ￦ 225,758 (3) The fair values of assets and liabilities acquired through the business combination at the acquisition date for the year ended December 31, 2019 are as follows: Type Amounts In millions of won Fair value of the identifiable assets ￦ Current assets Cash and cash equivalents 2,389 Trade and other receivables 55 Non-current Property, plant and equipment 54 Intangible assets 172,434 Other assets 60 Fair value of the identifiable liabilities Current liabilities Borrowings (2,900 ) Non-current Deferred tax liabilities (41,729 ) ￦ 130,363

Business Combination

Business Combination	12 Months Ended
	Dec. 31, 2019
Disclosure of detailed information about business combination [Abstract]
Disclosure of business combinations	51. Business Combination (1) The details of business combinations that occurred for the year ended December 31, 2019 are as follows: Company Key operation Date of Transfer In millions of won Eumseong Natural Gas Power Co., Ltd. Power generation 2019.12.23 225,758 Eumseong Natural Gas Power Co., Ltd. was established in August 2019 by spin-off (2) Details of the transfer price at fair value given by the acquirer of the business combination for the year ended December 31, 2019 are as follows: Type Amounts In millions of won Cash and cash equivalents ￦ 156,700 Other trade payables 10,000 Fair value of the shares owned before the acquisition 59,058 ￦ 225,758 (3) The fair values of assets and liabilities acquired through the business combination at the acquisition date for the year ended December 31, 2019 are as follows: Type Amounts In millions of won Fair value of the identifiable assets ￦ Current assets Cash and cash equivalents 2,389 Trade and other receivables 55 Non-current Property, plant and equipment 54 Intangible assets 172,434 Other assets 60 Fair value of the identifiable liabilities Current liabilities Borrowings (2,900 ) Non-current Deferred tax liabilities (41,729 ) ￦ 130,363 (4) Details of goodwill resulting from the business combination for the year ended December 31, 2019 are as follows: Type Amounts In millions of won Fair value of transfer price ￦ 225,758 Less : Fair value of the identifiable net assets (130,363 ) ￦ 95,395 Goodwill arose from the business combination due to the transfer price including the premium to obtain control paid in order to acquire Eumseong Natural Gas Power Co., Ltd. It also includes expectation of synergy effect and future growth in profits derived from business combination with LNG combined power generation project. These business rights can be separated from goodwill which satisfies the recognition requirements and thus the business rights have been recognized as a separate intangible asset. On the contrary, the expected benefits such as direct fuel acquisition and reduce costs for O&M did not satisfy the recognition requirements for identifiable intangible assets and thus were not recognized separately from the goodwill. (5) Net cash outflows from the business combination for the year ended December 31, 2019 are as follows: Type Amounts In millions of won Cash paid for the acquisition ￦ 156,700 Less : Cash and cash equivalents received (2,389 ) ￦ 154,311 (6) Fees for legal service, due diligence and others relating to the business combination amounted to 24 million. The fees were excluded from the transfer price and recognized as selling and administrative expenses in the statement of comprehensive income (loss) for the year ended December 31, 2019. (7) There is no sale or net profit included in the statement of comprehensive income (loss) for the year ended December 31,2019, in relation to additional business launched by Eumseong Natural Gas Power Co., Ltd.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2019
Subsequent Events [Abstract]
Subsequent Events	52. Subsequent Events (1) Subsequent to December 31, 2019, Korea South-East Power Co., Ltd., Korea Midland Power Co., Ltd. and Korea Hydro & Nuclear Power Co., Ltd. issued a foreign bond and corporate bonds for funding debt repayment, facility investments, and operations as follows: Company Type Issue date Maturity Interest rate Amount In millions of won and thousands of foreign currencies Korea South-East Power Co., Ltd. Foreign bond 2020.02.03 2025.02.03 2.13 % USD 300,000 Korea Midland Power Co., Ltd. #54-1 non-guaranteed 2020.02.25 2040.02.25 1.53 % KRW 50,000 #54-2 non-guaranteed 2020.02.25 2050.02.25 1.53 % KRW 120,000 #55 non-guaranteed 2020.03.18 2040.03.18 1.59 % KRW 80,000 Korea Hydro & Nuclear Power Co., Ltd. #55-1 non-guaranteed 2020.04.02 2040.04.02 1.80 % KRW 50,000 #55-2 non-guaranteed 2020.04.02 2050.04.02 1.80 % KRW 50,000 (2) Subsequent to December 31, 2019, Korea Western Power Co., Ltd. borrowed foreign short-term borrowings for funding operations. Details of the foreign short-term borrowings are as follows: Company Type Issue date Maturity Interest rate Amount Thousands of foreign currencies Korea Western Power Co., Ltd. Foreign short-term borrowings 2020.02.06 2020.05.06 1.97 % USD 24,658 Foreign short-term borrowings 2020.02.26 2020.05.26 1.86 % USD 7,329

Basis of Preparation (Policies)

Basis of Preparation (Policies)	12 Months Ended
	Dec. 31, 2019
Basis of Preparation [Abstract]
Statement of compliance	These consolidated financial statements have been prepared in accordance with International Financial Reporting Standards (“IFRS”) as issued by the International Accounting Standards Board (“IASB”).
Basis of measurement	Basis of measurement These consolidated financial statements have been prepared on the historical cost basis, except for the following material items in the consolidated statements of financial position: • financial assets at fair value through profit or loss • financial assets at fair value through other comprehensive income • derivative financial instruments are measured at fair value • liabilities for defined benefit plans are recognized at the net of the total present value of defined benefit obligations less the fair value of plan assets
Functional and presentation currency	Functional and presentation currency These consolidated financial statements are presented in Korean won (“won”), as won is the main currency used in KEPCO and most of the significant operating subsidiaries.
Use of estimates and judgments	Use of estimates and judgments The preparation of the consolidated financial statements in conformity with IFRS requires management to make judgments, estimates and assumptions that affect the application of accounting policies and the reported amounts of assets, liabilities, income and expenses. Actual results may differ from these estimates. Estimates and underlying assumptions are reviewed on an ongoing basis. Revisions to accounting estimates are recognized in the period in which the estimates are revised and in any future periods affected. The followings are the key assumptions and other key sources of estimation uncertainty at the end of the reporting period, that have a significant risk of causing a material adjustment to the carrying amounts of assets and liabilities within the next financial year. (i) Useful lives of property, plant and equipment, and estimations on provision for decommissioning costs The Company reviews the estimated useful lives of property, plant and equipment at the end of each annual reporting period. Management’s assumptions could affect the determination of estimated economic useful lives. The Company records the fair value of estimated decommissioning costs as a liability in the period in which the Company incurs a legal obligation associated with the retirement of long-lived assets that result from acquisition, construction, development and/or normal use of the assets. The Company is required to record a liability for the dismantling (demolition) of nuclear power plants and disposal of spent fuel and low and intermediate radioactive wastes. The measurement of such liability is subject to change based on change in estimated cash flow, inflation rate, discount rate, and expected timing of decommissioning. (ii) Deferred tax The Company recognizes deferred tax assets and liabilities based on the differences between the financial statement carrying amounts and the tax bases of assets and liabilities of each consolidated taxpaying entity. However, the amount of deferred tax assets may be impaired if the Company determines the estimated future taxable income is not sufficient to realize the deferred tax assets recognized. (iii) Valuations of financial instruments at fair values The Company’s accounting policies and disclosures require the measurement of fair values, for both financial and non-financial assets and liabilities. The Company has established control framework with respect to the measurement of fair values. The valuation team regularly reviews significant unobservable inputs and valuation adjustments. If third party information, such as broker quotes or pricing services, is used to measure fair values, then the valuation team assesses the evidence obtained from the third parties to support the conclusion that such valuations meet the requirements of IFRS including the level in the fair value hierarchy in which such valuation techniques should be classified. When measuring the fair value of an asset or a liability, the Company uses market observable data as far as possible. Fair values are categorized into different levels in a fair value hierarchy based on the inputs used in the valuation techniques as follows. If the inputs used to measure the fair value of an asset or a liability might be categorized in different levels of the fair value hierarchy, then the fair value measurement is categorized in its entirety in the same level of the fair value hierarchy as the lowest level input that is significant to the entire measurement. The Company recognizes transfers between levels of the fair value hierarchy at the end of the reporting period during which the change has occurred. (iv) Defined employee benefit liabilities The Company offers its employees defined benefit plans. The cost of providing benefits is determined using the Projected Unit Credit Method, with actuarial valuations being carried out at the end of each reporting period. For actuarial valuations, certain inputs such as discount rates and future salary increases are estimated. Defined benefit plans contain significant uncertainties in estimations due to its long-term nature (refer to Note 25). (v) Unbilled revenue Electricity delivered but neither metered nor billed is estimated at the reporting date based on the progressive electricity billing system, discounts on electricity bills for government policy purposes and penalties as well as a result of customer usage patterns, customer mix, meter reading schedules, weather, and etc. Unbilled revenue recognized as of December 31, 2018 and 2019 are ￦1,671,117 million and ￦1,580,804 million, respectively. (vi) Construction contracts The Company recognizes revenue over time using the cost-based input method which represents a faithful depiction of the Company’s progress towards complete satisfaction of providing the power plant construction, which has been identified as a single performance obligation. In applying the cost-based input method, it is necessary to use estimates and assumptions related to the Company’s efforts or inputs expected to be incurred. Cost incurred towards contract completion include costs associated with direct materials, labor, and other indirect costs related to contract performance. Judgment is required in estimating the costs expected to incur in completing the construction projects which involves estimating future materials, labor, contingencies and other related costs. Revenue is estimated based on the contractual amount however, it can also be affected by uncertainties resulting from unexpected future events. (vii) Early shutdown of Wolsong unit 1 nuclear power plant and changes in new nuclear power plants construction The 30-year According to the Eighth Basic Plan for Electricity Supply and Demand announced by the Ministry of Trade, Industry and Energy in 2017, Wolsong unit 1 nuclear power plant was expected to go through a comprehensive evaluation for the feasibility of continuous operation including economic efficiency and acceptability of household and community in 2018 in order to decide whether to shut down early. On June 15, 2018, the board of directors of Korea Hydro & Nuclear Power Co., Ltd. (“KHNP”), a subsidiary of KEPCO, has decided to shut down the Wolsong unit 1 on the grounds that its deficit was increasing, and its economic efficiency was low due to the unoptimistic utilization rate. On December 24, 2019, NSSC approved the permanent shutdown of unit 1. In addition, KHNP has also decided to discontinue the construction of Cheonji unit 1 and 2 and Daejin unit 1 and 2 pursuant to the government policy. For this reason, the Company recognized impairment loss, reversal of impairment loss and other expenses during the year 2018 and 2019, as described in Note 18 and Note 50. Among the new nuclear power plants under construction, Shin-Hanul unit 3 and 4, for which approval for power generation business was previously obtained, are not included in the decision to suspend construction of the board of directors of KHNP. However, considering the decision to shut down Wolsong unit 1 and suspended construction of Cheonji unit 1 and 2 and Daejin unit 1 and 2, it is highly likely that the construction of Shin-Hanul unit 3 and 4 will be suspended according to the government’s policy. For this reason, the Company recognized impairment loss as described in Note 18 and Note 50, as the Company believes that there was a significant change in its operating environment during the year ended December 31, 2018. The Korean government plans to refund to the Company for reasonable expenditures incurred in relation to the phase-out Information about critical judgments in applying accounting policies that have the most significant effect on the amounts recognized in the consolidated financial statements is included in the following notes: • Note 17 – Investments in Associates and Joint Ventures • Note 18 – Property, Plant and Equipment • Note 20 – Construction Contracts • Note 45 – Risk Management Information about assumptions and estimation uncertainties that have a significant risk of resulting in a material adjustment within the next financial year is included in the following notes: • Note 25 – Employment Benefits • Note 41 – Income Taxes
Changes in accounting policies	Changes in accounting policies (i) IFRS 16 ‘Leases’ IFRS 16 replaces existing leases guidance, including IAS 17 ‘Lease’, IFRIC 4 ‘Determining whether an Arrangement contains a Lease’, SIC-15 SIC-27 on-balance Lessor accounting under IFRS 16 is substantially unchanged from IAS 17. Lessors will continue to classify leases as either operating or finance leases using similar principles as in IAS 17. The Company adopted IFRS 16 using the modified retrospective method of adoption with the date of initial application of January 1, 2019. Under this method, the standard is applied retrospectively with the cumulative effect of initially applying the standard recognized at the date of initial application. The Company elected to use the recognition exemptions for lease contracts that, at the commencement date, have a lease term of 12 months or less and do not contain a purchase option (‘short-term leases’), and lease contracts for which the underlying asset is of low value (‘leases of low-value The impacts on the Company’s consolidated statements of financial position on the date of initial application (January 1, 2019) of IFRS 16 are as follows: Carrying amount Adjustment Carrying amount In millions of won Assets Current assets Cash and cash equivalents ￦ 1,358,345 — 1,358,345 Current financial assets, net 2,359,895 — 2,359,895 Trade and other receivables, net 7,793,592 — 7,793,592 Inventories, net 7,188,253 — 7,188,253 Income tax refund receivables 143,214 — 143,214 Current non-financial 878,888 (3,021 ) 875,867 Assets held-for-sale 22,881 — 22,881 Total current assets 19,745,068 (3,021 ) 19,742,047 Non-current Non-current 2,113,613 — 2,113,613 Non-current 1,819,845 (10 ) 1,819,835 Property, plant and equipment, net 152,743,194 4,947,947 157,691,141 Investment properties, net 159,559 — 159,559 Goodwill 2,582 — 2,582 Intangible assets other than goodwill, net 1,225,942 — 1,225,942 Investments in associates 4,064,820 — 4,064,820 Investments in joint ventures 1,813,525 — 1,813,525 Deferred tax assets 1,233,761 — 1,233,761 Non-current non-financial 327,152 (1,332 ) 325,820 Total non-current 165,503,993 4,946,605 170,450,598 Total Assets ￦ 185,249,061 4,943,584 190,192,645 Carrying amount Adjustment Carrying amount In millions of won Liabilities Current liabilities Trade and other payables, net ￦ 6,405,395 510,304 6,915,699 Current financial liabilities, net 7,981,879 — 7,981,879 Income tax payables 285,420 — 285,420 Current non-financial 5,574,041 — 5,574,041 Current provisions 1,594,798 — 1,594,798 Total current liabilities 21,841,533 510,304 22,351,837 Non-current Non-current 2,941,696 4,433,280 7,374,976 Non-current 53,364,911 — 53,364,911 Non-current non-financial 8,160,033 — 8,160,033 Employee benefits liabilities, net 1,645,069 — 1,645,069 Deferred tax liabilities 9,617,309 — 9,617,309 Non-current 16,585,748 — 16,585,748 Total non-current 92,314,766 4,433,280 96,748,046 Total Liabilities(*) ￦ 114,156,299 4,943,584 119,099,883 Equity Contributed capital ￦ 4,053,578 — 4,053,578 Retained earnings 51,519,119 — 51,519,119 Other components of equity 14,171,228 — 14,171,228 Equity attributable to owners of the controlling company 69,743,925 — 69,743,925 Non-controlling 1,348,837 — 1,348,837 Total Equity ￦ 71,092,762 — 71,092,762 Total Liabilities and Equity ￦ 185,249,061 4,943,584 190,192,645 (*) The adjustment from the total liabilities amounting to ￦4,943,584 is a present value of operating lease payment as of December 31, 2018, discounted by the weighted average interest rate of the lessee’s incremental borrowing rates as of January 1, 2019, and deducted by the present value of short-term leases and low-value The Company has lease contracts for various items such as consecutive voyage charter contracts, power purchase agreements (PPA), real estate lease contracts including buildings, switchyard, and land for electric substations, vehicles, and other equipment. Before adoption of IFRS 16, the Company, as a lessee, classified a lease contract as a finance lease if it transferred substantially all of the risks and rewards incidental to ownership of the leased asset to the Company; otherwise as an operating lease. Upon adoption of IFRS 16, the Company applied a single recognition and measurement approach for all leases, except for short-term leases and leases of low-value The significant accounting policies applied by the Company in preparation of its consolidated financial statements are described in Note 3.(9).

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2019
Significant Accounting Policies [Abstract]
Basis of consolidation	Basis of consolidation The consolidated financial statements are the financial statements of the Company in which the assets, liabilities, equity, income, expenses and cash flows of KEPCO and its subsidiaries are presented as those of a single economic entity. Subsidiaries are those entities controlled by the Company. The Company controls an entity when it is exposed to, or has rights to, variable returns from its involvement with the entity and has the ability to affect those returns through its power over the entity. Income and expense of a subsidiary acquired or disposed of during the year are included in the consolidated statement of comprehensive income from the effective date of acquisition and up to the effective date of disposal, as appropriate. Total comprehensive income of subsidiaries is attributed to the owners of the Company and to the non-controlling non-controlling When necessary, adjustments are made to the financial statements of subsidiaries to bring their accounting policies into line with those of the Company. Transactions within the Company are eliminated during the consolidation. Changes in the Company’s ownership interests in a subsidiary that do not result in the Company losing control over the subsidiary are accounted for as equity transactions. The carrying amounts of the Company’s interests and the non-controlling non-controlling When the Company loses control of a subsidiary, any gain or loss on disposal is calculated as the difference between (i) the aggregate of the fair value of the consideration received and the fair value of any retained interest and (ii) the previous carrying amount of the assets (including goodwill), and liabilities of the subsidiary and any non-controlling
Business combinations	Business combinations A business combination is accounted for by applying the acquisition method, unless it is a combination involving entities or businesses under common control. The consideration transferred in a business combination is measured at fair value, which is calculated as the sum of the acquisition-date fair values of the assets transferred by the Company, liabilities incurred by the Company to the former owners of the acquiree and the equity interests issued by the Company in exchange for control of the acquiree. Acquisition-related costs are generally recognized in profit or loss as incurred. At the acquisition date, the identifiable assets acquired, and the liabilities assumed are recognized at their fair value at the acquisition date, except that: • deferred tax assets or liabilities and liabilities or assets related to employee benefit arrangements are recognized and measured in accordance with IAS 12 ‘Income Taxes’ and IAS 19 ‘Employee Benefits’ respectively; • assets (or disposal groups) that are classified as held for sale in accordance with IFRS 5 ‘Non-current Goodwill is measured as the excess of the sum of the consideration transferred, the amount of any non-controlling non-controlling Non-controlling non-controlling transaction-by-transaction non-controlling The subsequent accounting for changes in the fair value of the contingent consideration that do not qualify as measurement period adjustments depends on how the contingent consideration is classified. Contingent consideration that is classified as equity is not re-measured re-measured When a business combination is achieved in stages, the Company’s previously held equity interest in the acquiree is re-measured If the initial accounting for a business combination is incomplete by the end of the reporting period in which the combination occurs, the Company reports provisional amounts for the items for which the accounting is incomplete. Those provisional amounts are adjusted during the measurement period (see above), or additional assets or liabilities are recognized, to reflect new information obtained about facts and circumstances that existed at the acquisition date that, if known, would have affected the amounts recognized at that date. The assets and liabilities acquired under business combinations under common control are recognized at the carrying amounts recognized previously in the consolidated financial statements of the ultimate parent. The difference between consideration transferred and carrying amounts of net assets acquired is recognized as part of share premium.
Investments in associates	An associate is an entity over which the Company has significant influence and that is neither a subsidiary nor an interest in a joint venture. Significant influence is the power to participate in the financial and operating policy decisions of the investee but does not control or joint control over those policies. If the Company holds 20% ~ 50% of the voting power of the investee, it is presumed that the Company has significant influence. The results and assets and liabilities of associates are incorporated in these consolidated financial statements using the equity method of accounting. If the investment is classified as held for sale, in which case it is accounted for in accordance with IFRS 5 ‘Non-current Under the equity method, an investment in an associate is initially recognized in the consolidated statement of financial position at cost and adjusted thereafter to recognize the Company’s share of the profit or loss and other comprehensive income of the associate. When the Company’s share of losses of an associate exceeds the Company’s interest in that associate (which includes any long-term interests that, in substance, form part of the Company’s net investment in the associate), the Company discontinues recognizing its share of further losses. Additional losses are recognized only to the extent that the Company has incurred legal or constructive obligations or made payments on behalf of the associate. Any excess of the cost of acquisition over the Company’s share of the net fair value of the identifiable assets, liabilities and contingent liabilities of an associate recognized at the date of acquisition is recognized as goodwill, which is included within the carrying amount of the investment. Any excess of the Company’s share of the net fair value of the identifiable assets, liabilities and contingent liabilities over the cost of acquisition, after reassessment, is recognized immediately in profit or loss. Upon disposal of an associate that results in the Company losing significant influence over that associate, any retained investment is measured at fair value at that date and the fair value is regarded as its fair value on initial recognition as a financial asset in accordance with IFRS 9. The difference between the previous carrying amount of the associate attributable to the retained interest and its fair value is included in the determination of the gain or loss on disposal of the associate. In addition, the Company accounts for all amounts previously recognized in other comprehensive income in relation to that associate on the same basis as would be required if that associate had directly disposed of the related assets or liabilities. Therefore, if a gain or loss previously recognized in other comprehensive income by that associate would be reclassified to profit or loss on the disposal of the related assets or liabilities, the Company reclassifies the gain or loss from equity to profit or loss (as a reclassification adjustment) when it loses significant influence over that associate. The requirements of IAS 28 ‘Investments in Associates and Joint Ventures’ are applied to determine whether it is necessary to recognize any impairment loss with respect to the Company’s investment in an associate. When necessary, the entire carrying amount of the investment (including goodwill) is tested for impairment in accordance with IAS 36 ‘Impairment of Assets’ as a single asset by comparing its recoverable amount (higher of value in use and fair value less costs to sell) with its carrying amount, any impairment loss recognized forms part of the carrying amount of the investment. Any reversal of that impairment loss is recognized in accordance with IAS 36 to the extent that the recoverable amount of the investment subsequently increases. When the Company transacts with its associate, incomes and losses resulting from the transactions with the associate are recognized in the Company’s consolidated financial statements only to the extent of interests in the associate that are not related to the Company.
Joint arrangements	Joint arrangements A joint arrangement is an arrangement of which two or more parties have joint control. Joint control is the contractually agreed sharing of control of an arrangement, which exists only when decisions about the relevant activities require the unanimous consent of the parties sharing control. Joint arrangements are classified into two types—joint operations and joint ventures. A joint operation is a joint arrangement whereby the parties that have joint control of the arrangement (i.e., joint operators) have rights to the assets, and obligations for the liabilities, relating to the arrangement. A joint venture is a joint arrangement whereby the parties that have joint control of the arrangement (i.e., joint ventures) have rights to the net assets of the arrangement. If the Company is a joint operator, the Company is to recognize and measure the assets and liabilities (and recognize the related revenues and expenses) in relation to its interest in the arrangement in accordance with relevant IFRSs applicable to the particular assets, liabilities, revenues and expenses. If the joint arrangement is a joint venture, the Company is to account for that investment using the equity method accounting in accordance with IAS 28 ‘Investment in Associates and Joint Ventures’ (refer to Note 3.(3), except when the Company is applicable to the IFRS 5 ‘Non-current
Non-current assets held for sale	Non-current Non-current non-current When the Company is committed to a sale plan involving loss of control of a subsidiary, all of the assets and liabilities of that subsidiary are classified as held for sale when the criteria described above are met, regardless of whether the Company will retain a non-controlling Non-current
Goodwill	Goodwill The Company measures goodwill which acquired in a business combination at the amount recognized at the date on which it obtains control of the acquiree (acquisition date) less any accumulated impairment losses. Goodwill acquired in a business combination is allocated to each cash-generating unit (CGU) that is expected to benefit from the synergies arising from the business acquired. The Company assesses at the end of each reporting period and whenever there is an indication that the asset may be impaired. An impairment loss is recognized if the carrying amount of an asset or a CGU exceeds its recoverable amount. Impairment losses are recognized in profit or loss. Any impairment identified at the CGU level will first reduce the carrying value of goodwill and then be used to reduce the carrying amount of the other assets in the CGU on a pro rata basis. Except for impairment losses in respect of goodwill which are never reversed, an impairment loss is reversed if there has been a change in the estimates used to determine the recoverable amount. An impairment loss is reversed only to the extent that the asset’s carrying amount does not exceed the carrying amount that would have been determined, net of depreciation or amortization, if no impairment loss had been recognized. On disposal of the relevant CGU, the amount of goodwill is included in the determination of the gain or loss on disposal.
Revenue from Contracts with Customers	Revenue from Contracts with Customers The Company recognizes revenue by applying the five-step approach (Step 1: Identify the contract(s) with a customer, Step 2: Identify the performance obligations in the contract, Step 3: Determine the transaction price, Step 4: Allocate the transaction price to the performance obligations in the contract, Step 5: Recognize revenue when the entity satisfied a performance obligation). The Company recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services, excluding amounts collected on behalf of third parties. Also, the Company recognizes revenue when the Company satisfies a performance obligation by transferring a promised good or service to a customer. (i) Sale of goods The Company sells electricity to customers and accounts for the transmission and distribution of electricity as a single performance obligation. The sale of electricity is recognized at a point in time when electricity has been distributed to the customer. The transaction price includes variable consideration due to the progressive electricity billing system, discounts on electricity bills for government policy purposes and penalties as well as a result of customer usage patterns, customer mix, meter reading schedules, weather, etc. Variable consideration is estimated by using the expected value method which predicts the amount of consideration to which the Company will be entitled and is only recognized only to the extent that it is highly probable that a significant reversal in the amount of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is subsequently resolved which is when the customer is billed. (ii) Sale of construction services The Company also provides services for power plant construction and engineering, procurement and construction (“EPC”) where each contract has a single performance obligation and is recognized over time on the estimated progress to completion of the construction using the cost-based input method. The Company believes using the cost-based input method represents a faithful depiction of the transfer of services to the customer. Cost incurred towards contract completion include costs associated with direct materials, labor, and other indirect costs related to contract performance. Judgment is required in estimating the costs expected to incur in completing the construction projects which involves estimating future materials, labor, contingencies and other related costs. Revenue is estimated based on the contractual amount. However, it may be affected by uncertainties resulting from unexpected future events. Revenue may be recognized in advance of billing the customer which results in the recording of a contract asset. Once the Company meets the billing criteria and its rights to consideration become unconditional, the contract asset is then transferred to trade receivable. Billing requirements are generally structured around the completion of certain construction milestones. On some instances, contract liability is recognized when the Company receives consideration before being able to recognize revenue. Once revenue recognition conditions are met, the contract liability is subsequently released to revenue. (iii) Sale of services The Company develops electric power resources including the provision of power generation byproducts and O&M services which are accounted for as a separate performance obligation under each contract. The Company recognizes revenue over time when customers consume the benefits provided by the Company under the terms of the service agreement.
Deferred Revenue	Deferred Revenue The Company receives consideration in the form of an item of property, equipment or cash for constructing or acquiring an item of property or equipment in exchange for supplying electricity to its customers. The transaction price is based on the fair value of the consideration received and is initially recorded in deferred revenue included in current and non-current non-financial liabilities of the Company’s consolidated financial position. The Company determines the supply of electricity to be a single performance obligation. Deferred revenue is released to other income over time on a straight-line basis throughout the estimated service period which does not exceed the transferred asset’s useful life.
Leases	Leases The lessee and the lessor account for each lease component separately from non-lease non-lease non-lease (i) The Company as a lessor In the case of finance leases, the Company recognizes the same amount of the net investment in the lease as finance lease receivables and recognizes interest income using the effective interest method. Income from operating leases is recognized using the straight-line basis over the lease term, and lease opening direct costs incurred during the negotiation and contract phase of the operating lease contract are added to the carrying amount of the lease asset and recognized as expenses over the lease term on a straight-line basis. (ii) The Company as a lessee (a) Leases previously classified as finance leases The Company did not change the initial carrying amounts of recognized assets and liabilities at the date of initial application for leases previously classified as finance leases (i.e., the right-of-use (b) Leases previously accounted for as operating leases The Company recognized right-of-use low-value right-of-use • Lease liabilities At the commencement date of the lease, the Company recognized lease liabilities measured at the present value of lease payments to be made over the lease term. The incremental borrowing rate as a lessee at the date of initial application is 1.81% ~ 4.79%, and the effect of initial adoption are described in Note 2.(5). The Company applied the practical expedient to post-judgment of the possibility of exercising the option of extension or termination when estimating the remaining lease duration. The Company also applied a single discount rate to a portfolio of leases with similar characteristics. • Right-of-use The Company recognized a right-of-use right-of-use Contracts recognized as leases before the date of initial application are accounted for leases regardless of whether they meet the new lease definition or not. After the date of initial application, the Company evaluates whether new lease contracts meet definition of the lease under IFRS 16. The Company also applied the available practical expedients wherein it: • Applied the short-term leases exemptions to leases with lease term that ends within 12 months at the date of initial application • Excluded the initial direct costs from the measurement of the right-of-use • Used hindsight in determining the lease term where the contract contains options to extend or terminate the lease • Applied the low-value (iii) Summary of new accounting policies Set out below are the new accounting policies of the Company upon adoption of IFRS 16, which have been applied from the date of initial application: • Right-of-use The Company recognizes right-of-use Right-of-use re-measurement right-of-use right-of-use Right-of-use • Lease liabilities At the commencement date of the lease, the Company recognizes lease liabilities measured at the present value of lease payments to be made over the lease term. The lease payments include fixed payments (including in-substance In calculating the present value of lease payments, the Company uses its incremental borrowing rate at the lease commencement date if the interest rate implicit in the lease is not readily determinable. After the commencement date, the amount of lease liabilities is increased to reflect the accretion of interest and reduced for the lease payments made. In addition, the carrying amount of lease liabilities is remeasured if there is a modification, a change in the lease term, a change in the in-substance • Short-term leases and leases of low-value The Company applies the short-term leases recognition exemption to its short-term leases of machinery and equipment (i.e., those leases that have a lease term of 12 months or less from the commencement date and do not contain a purchase option). It also applies the leases of low-value low-value Book value and changes in book value of right-of-use
Foreign currencies	Foreign currencies Transactions in foreign currencies are translated to the respective functional currencies of the Company entities at exchange rates at the dates of the transactions. Monetary assets and liabilities denominated in foreign currencies are retranslated to the functional currency using the reporting date’s exchange rate. Non-monetary Exchange differences are recognized in profit or loss in the period in which they arise except for: • Exchange differences on foreign currency borrowings relating to assets under construction for future productive use, which are included in the cost of those assets when they are regarded as an adjustment to interest costs on those foreign currency borrowings; • Exchange differences on transactions entered into in order to hedge certain foreign currency risks (refer to note 3.(24) Derivative financial instruments, including hedge accounting); and • Exchange differences on monetary items receivable from or payable to a foreign operation for which settlement is neither planned nor likely to occur (therefore forming part of the net investment in the foreign operation), which are recognized initially in other comprehensive income and reclassified from equity to profit or loss on disposal or partial disposal of the net investment. For the purpose of presenting financial statements, the assets and liabilities of the Company’s foreign operations are expressed in Korean won using exchange rates prevailing at the end of the reporting period. Income and expense items are translated at the average exchange rates for the period, unless exchange rates fluctuated significantly during that period, in which case the exchange rates at the dates of the transactions are used. Exchange differences arising, if any, are recognized in other comprehensive income and accumulated in equity. When a foreign operation is disposed of, the relevant amount in the translation is transferred to profit or loss as part of the gain or loss on disposal.
Borrowing costs	Borrowing costs The Company capitalizes borrowing costs directly attributable to the acquisition, construction or production of a qualifying asset as part of the cost of that asset. Other borrowing costs are recognized in expense as incurred. A qualifying asset is an asset that requires a substantial period of time to get ready for its intended use or sale. Investment income earned on the temporary investment of specific borrowings pending their expenditure on qualifying assets is deducted from the borrowing costs eligible for capitalization. All other borrowing costs are recognized in profit or loss in the period in which they are incurred.
Government grants	Government grants Government grants are not recognized unless there is reasonable assurance that the Company will comply with the grant’s conditions and that the grant will be received. Benefit from a government loan at a below-market interest rate is treated as a government grant, measured as the difference between proceeds received and the fair value of the loan based on prevailing market interest rates. (i) If the Company received grants related to assets Government grants whose primary condition is that the Company purchase, construct or otherwise acquire long-term assets are deducted in calculating the carrying amount of the asset. The grant is recognized in profit or loss over the life of a depreciable asset as a reduced depreciation expense. (ii) If the Company received grants related to income Government grants which are intended to compensate the Company for expenses incurred are recognized as other income (government grants) in profit or loss over the periods in which the Company recognizes the related costs as expenses.
Employee benefits	Employee benefits When an employee has rendered service to the Company during a period, the Company recognizes the contribution payable to a defined contribution plan in exchange for that service as a liability (accrued expense). For defined benefit pension plans and other post-employment benefits, the net periodic pension expense is actuarially determined by “Pension Actuarial System” developed by independent actuaries using the projected unit credit method. The present value of the defined benefit obligation is determined by discounting the estimated future cash outflows using interest rates of high-quality corporate bonds that are denominated in the currency in which the benefits will be paid and that have terms to maturity approximating the terms of the related pension liability. However, if there is not a deep market, market yields on government bonds are used. Net defined benefit liability’s measurement is composed of actuarial gains and losses, return on plan assets excluding net interest on net defined benefit liability, and any change in the effect of the asset ceiling, excluding net interest, which are immediately recognized in other comprehensive income. The actuarial gains or losses recognized in other comprehensive income which will not be reclassified into net profit or loss for later periods are immediately recognized in retained earnings. Past service cost will be recognized as expenses upon the earlier of the date of change or reduction to the plan, or the date of recognizing termination benefits. The retirement benefit obligation recognized in the statement of financial position represents the present value of the defined benefit obligation as adjusted for unrecognized actuarial gains and losses and unrecognized past service cost, and as reduced by the fair value of plan assets. Any asset resulting from this calculation is limited to unrecognized actuarial losses and past service cost, plus the present value of available refunds and reductions in future contributions to the plan.
Income taxes	Income taxes Income tax expense comprises current and deferred tax. Current tax and deferred tax are recognized in profit or loss except to the extent that it relates to a business combination, or items recognized directly in equity or in other comprehensive income. (i) Current tax Current tax is the expected tax payable or receivable on the taxable profit or loss for the year, using tax rates enacted or substantively enacted at the end of the reporting period and any adjustment to tax payable in respect of previous years. The taxable profit is different from the accounting profit for the period since the taxable profit is calculated excluding the temporary differences, which will be taxable or deductible in determining taxable profit (tax loss) of future periods, and non-taxable non-deductible Current tax assets and liabilities are offset only if, the Company: (a) has a legally enforceable right to set off the recognized amounts; and (b) intends either to settle on a net basis, or to realize the asset and settle the liability simultaneously. (ii) Deferred tax Deferred tax is recognized, using the asset-liability method, in respect of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for taxation purposes. A deferred tax liability is recognized for all taxable temporary differences. A deferred tax asset is recognized for all deductible temporary differences to the extent that it is probable that taxable profit will be available against which they can be utilized. However, deferred tax is not recognized for the following temporary differences: taxable temporary differences arising on the initial recognition of goodwill, or the initial recognition of assets or liabilities in a transaction that is not a business combination and that affects neither accounting profit or loss nor taxable income. In certain circumstances such as when accounting for leases or decommissioning costs of nuclear power plants, the carrying amount of the asset recorded is equal to the liability recognized at initial recognition. When recording its deferred tax balances, the Company considers these assets and liabilities separately on a gross basis. Accordingly, the taxable temporary difference relating to the asset and the deductible temporary difference relating to the liability are separately recognized and presented on a net basis in the financial statements. The measurement of deferred tax liabilities and deferred tax assets reflects the tax consequences that would follow from the manner in which the Company expects, at the end of the reporting period, to recover or settle the carrying amount of its assets and liabilities. Deferred tax assets or deferred tax liabilities on investment properties measured at fair value, unless any contrary evidence exists, are measured using the assumption that the carrying amount of the property will be recovered entirely through sale. The Company recognizes a deferred tax liability for all taxable temporary differences associated with investments in subsidiaries, associates, and interests in joint ventures, except to the extent that the Company is able to control the timing of the reversal of the temporary difference and it is probable that the temporary difference will not reverse in the foreseeable future. The Company recognizes a deferred tax asset for all deductible temporary differences arising from investments in subsidiaries and associates, to the extent that it is probable that the temporary difference will reverse in the foreseeable future and taxable profit will be available against which the temporary difference can be utilized. The carrying amount of a deferred tax asset is reviewed at the end of each reporting period and reduces the carrying amount to the extent that it is no longer probable that sufficient taxable profit will be available to allow the benefit of part or all of that deferred tax asset to be utilized. Deferred tax assets and liabilities are measured at the tax rates that are expected to apply to the period when the asset is realized or the liability is settled, based on tax rates (and tax laws) that have been enacted or substantively enacted by the end of the reporting period. The measurement of deferred tax liabilities and deferred tax assets reflects the tax consequences that would follow from the manner in which the Company expects, at the end of the reporting period to recover or settle the carrying amount of its assets and liabilities. Deferred tax assets and liabilities are offset only if there is a legally enforceable right to offset the related current tax liabilities and assets, and they relate to income taxes levied by the same tax authority and they intend to settle current tax liabilities and assets on a net basis. (iii) Current and deferred tax for the year Current and deferred tax are recognized in profit or loss, except when they relate to items that are recognized in other comprehensive income or directly in equity, in which case, the current and deferred tax are also recognized in other comprehensive income or directly in equity respectively. Where current tax or deferred tax arises from the initial accounting for a business combination, the tax effect is included in the accounting for the business combination.
Property, plant and equipment	Property, plant and equipment Property, plant and equipment are initially measured at cost and after initial recognition, are carried at cost less accumulated depreciation and accumulated impairment losses. The cost of property, plant and equipment includes expenditures arising directly from the construction or acquisition of the asset, any costs directly attributable to bringing the asset to the location and condition necessary for it to be capable of operating in the manner intended by management and the initial estimate of the costs of dismantling and removing the item and restoring the site on which it is located. Subsequent costs are recognized in the carrying amount of property, plant and equipment at cost or, if appropriate, as separate items if it is probable that future economic benefits associated with the item will flow to the Company and the cost of the item can be measured reliably. The carrying amount of the replaced part is derecognized. The costs of the day-to-day Property, plant and equipment, except for land, are depreciated on a straight-line basis over estimated useful lives that appropriately reflect the pattern in which the asset’s future economic benefits are expected to be consumed. For loaded nuclear fuel related to long-term raw materials and spent nuclear fuels related to asset retirement costs, the Company uses the unit-of-production The estimated useful lives of the Company’s property, plant and equipment are as follows: Useful lives (years) Buildings 8 ~ 40 Structures 8 ~ 50 Machinery 2 ~ 32 Vehicles 3 ~ 8 Loaded heavy water 30 Asset retirement costs 18, 30, 40, 60 Right-of-use 1 ~ 32 Ships 9 Others 4 ~ 15 A component that is significant compared to the total cost of property, plant and equipment is depreciated over its separate useful life. Depreciation methods, residual values and useful lives of property, plant and equipment are reviewed at the end of each reporting period and if change is deemed appropriate, it is treated as a change in accounting estimate. Property, plant and equipment are derecognized on disposal, or when no future economic benefits are expected from its use or disposal. Gains or losses arising from derecognition of a property, plant and equipment, measured as the difference between the net disposal proceeds and the carrying amount of the asset, are recognized in profit or loss when the asset is derecognized.
Investment property	Investment property Property held for the purpose of earning rentals or benefiting from capital appreciation is classified as investment property. Investment property is initially measured at its cost. Transaction costs are included in the initial measurement. Subsequently, investment property is carried at depreciated cost less any accumulated impairment losses. Subsequent costs are recognized in the carrying amount of investment property at cost or, if appropriate, as separate items if it is probable that future economic benefits associated with the item will flow to the Company and the cost of the item can be measured reliably. The carrying amount of the replaced part is derecognized. The costs of the day-to-day Investment property except for land, are depreciated on a straight-line basis over 8 ~ 40 years as estimated useful lives. The estimated useful lives, residual values and depreciation method are reviewed at the end of each reporting period, with the effect of any changes in estimate accounted for on a prospective basis. An investment property is derecognized upon disposal or when the investment property is permanently withdrawn from use and no future economic benefits are expected from the disposal. Any gain or loss arising on derecognition of the property (calculated as the difference between the net disposal proceeds and the carrying amount of the asset) is included in profit or loss in the period in which the property is derecognized.
Intangible assets	Intangible assets (i) Intangible assets acquired separately Intangible assets with finite useful lives that are acquired separately are carried at cost less accumulated amortization and accumulated impairment losses. Amortization is recognized on a straight-line basis over their estimated useful lives. The estimated useful life and amortization method are reviewed at the end of each reporting period, with the effect of any changes in estimate being accounted for on a prospective basis. Intangible assets with indefinite useful lives that are acquired separately are carried at cost less accumulated impairment losses. (ii) Research and development Expenditure on research activities is recognized as an expense in the period in which it is incurred. An internally-generated intangible asset arising from development (or from the development phase of an internal project) is recognized if, and only if, all of the following have been demonstrated: • The technical feasibility of completing the intangible asset so that it will be available for use or sale; • The intention to complete the intangible asset and use or sell it; • The ability to use or sell the intangible asset; • How the intangible asset will generate probable future economic benefits; • The availability of adequate technical, financial and other resources to complete the development and to use or sell the intangible asset; and • The ability to measure reliably the expenditure attributable to the intangible asset during its development. The amount initially recognized for internally-generated intangible assets is the sum of the expenditure incurred from the date when the intangible asset first meets the recognition criteria listed above. When the development expenditure does not meet the criteria listed above, an internally-generated intangible asset cannot be recognized and the expenditure is recognized in profit or loss in the period in which it is incurred. Internally-generated intangible assets are reported at cost less accumulated amortization and accumulated impairment losses. The estimated useful lives and amortization methods of the Company’s intangible assets are as follows: Useful lives (years) Amortization methods Usage rights for donated assets 10 ~ 30 Straight line Software 4, 5 Straight line Industrial rights 5 ~ 10 Straight line Development expenses 5 Straight line Leasehold rights 10 Straight line Others 3 ~ 50 or indefinite Straight line Mining right — Unit of production (iii) Intangible assets acquired in a business combination Intangible assets that are acquired in a business combination are recognized separately from goodwill are initially recognized at their fair value at the acquisition date. Subsequent to initial recognition, intangible assets acquired in a business combination are reported at cost less accumulated amortization and accumulated impairment losses, on the same basis as intangible assets that are acquired separately. (iv) Derecognition of intangible assets An intangible asset is derecognized on disposal, or when no future economic benefits are expected from its use or disposal. Gains or losses arising from derecognition of an intangible asset are measured as the difference between the net disposal proceeds and the carrying amount of the asset, and are recognized in gain or loss when the asset is derecognized.
Greenhouse gas emissions rights (allowances) and obligations	Greenhouse gas emissions rights (allowances) and obligations In connection with Enforcement of Allocation and Trading of Greenhouse Gas Emissions Allowances, the Company applies the following accounting policies for greenhouse gas emissions rights and obligations. (i) Greenhouse gas emissions rights Greenhouse gas emissions rights consist of the allowances received free of charge from the government and the ones purchased. The cost of the greenhouse gas emissions rights includes expenditures arising directly from the acquisition and any other costs incurred during normal course of the acquisition. Greenhouse gas emissions rights are held by the Company to fulfill the legal obligation and recorded as intangible assets. To the extent that the portion to be submitted to the government within one year from the end of reporting period, the greenhouse gas emissions rights are classified as current assets. Greenhouse gas emissions rights recorded as intangible assets are initially measured at cost and substantially remeasured at cost less accumulated impairment losses. Greenhouse gas emissions rights are derecognized on submission to the government or when no future economic benefits are expected from its use or disposal. (ii) Greenhouse gas emissions obligations Greenhouse gas emissions obligations are the Company’s present legal obligation to submit the greenhouse gas emissions allowances to the government and recognized when an outflow of resources is probable and a reliable estimate can be made of the amount of the obligation. Greenhouse gas emissions obligations are measured as the sum of the carrying amount of the allocated rights that will be submitted to the government and the best estimate of expenditure required to settle the obligation at the end of the reporting period for any excess emission.
Impairment of non-financial assets other than goodwill	Impairment of non-financial At the end of each reporting period, the Company reviews the carrying amounts of its tangible and intangible assets with definite useful lives to determine whether there is any indication that those assets may have been impaired. If any such indication exists, the recoverable amount of the asset is estimated in order to determine the extent of the impairment loss (if any). Where it is not possible to estimate the recoverable amount of an individual asset, the Company estimates the recoverable amount of the cash-generating unit to which the asset belongs. Where a reasonable and consistent basis of allocation can be identified, corporate assets are also allocated to individual cash-generating units, or otherwise they are allocated to the smallest Group of cash-generating units for which a reasonable and consistent allocation basis can be identified. Intangible assets with indefinite useful lives and intangible assets not yet available for use are tested for impairment at least annually, and whenever there is an indication that the asset may be impaired. Recoverable amount is the higher of fair value less costs to sell and value in use. In assessing value in use, the estimated future cash flows are discounted to their present value using a pre-tax If the recoverable amount of an asset (or a cash-generating unit) is estimated to be less than its carrying amount, the carrying amount of the asset (or the cash-generating unit) is reduced to its recoverable amount. An impairment loss is recognized immediately in profit or loss. When an impairment loss subsequently reverses, the carrying amount of the asset (or a cash-generating unit) is increased to the revised estimate of its recoverable amount, to the extent the increased carrying amount does not exceed the carrying amount that would have been determined had no impairment loss been recognized for the asset (or cash-generating unit) in prior years. A reversal of an impairment loss is recognized immediately in profit or loss.
Inventories	Inventories Inventories are measured at the lower of cost and net realizable value. Cost of inventories for inventories in transit are measured by using specific identification method. Cost of inventories, except for those in transit, are measured under the weighted average method and consists of the purchase price, cost of conversion and other costs incurred in bringing the inventories to their present location and condition. Net realizable value is the estimated selling price in the ordinary course of business, less the estimated costs of completion and selling expenses. The amount of any write-down of inventories to net realizable value and all losses of inventories are recognized as an expense in the period the write-down or loss occurs. The amount of any reversal of any write-down of inventories, arising from an increase in net realizable value, are recognized as a reduction in the amount of inventories recognized as an expense in the period in which the reversal occurs.
Provisions	Provisions Provisions are recognized when the Company has a present legal or constructive obligation as a result of a past event, it is probable that an outflow of resources embodying economic benefits will be required to settle the obligation and a reliable estimate can be made of the amount of the obligation. The risks and uncertainties that inevitably surround many events and circumstances are taken into account in reaching the best estimate of a provision. Where the effect of the time value of money is material, provisions are determined at the present value of the expected future cash flows. Where some or all of the expenditures required to settle a provision are expected to be reimbursed by another party, the reimbursement shall be recognized when, and only when, it is virtually certain that reimbursement will be received if the entity settles the obligation. The reimbursement shall be treated as a separate asset. Provisions are reviewed at the end of each reporting period and adjusted to reflect the current best estimates. If it is no longer probable that an outflow of resources embodying economic benefits will be required to settle the obligation, the provision is reversed. (i) Provision for employment benefits The Company determines the provision for employment benefits as the incentive payments based on the results of the individual performance evaluation or management assessment. (ii) Provision for decommissioning costs of nuclear power plants The Company records the fair value of estimated decommissioning costs as a liability in the period in which the Company incurs a legal obligation associated with retirement of long-lived assets that result from acquisition, construction, development and/or normal use of the assets. Accretion expense consists of period-to-period (iii) Provision for disposal of spent nuclear fuel Under the Radioactive Waste Management Act, the Company is levied to pay the spent nuclear fuel fund for the management of spent nuclear fuel. The Company recognizes the provision of present value of the payments. (iv) Provision for low and intermediate radioactive wastes Under the Radioactive Waste Management Act, the Company recognizes the provision for the disposal of low and intermediate radioactive wastes in best estimate of the expenditure required to settle the present obligation. (v) Provision for Polychlorinated Biphenyls (“PCBs”) Under the regulation of Persistent Organic Pollutants Management Act, enacted in 2007, the Company is required to remove PCBs, a toxin, from the insulating oil of its transformers by 2025. As a result of the enactments, the Company is required to inspect the PCBs contents of transformers and dispose of PCBs in excess of safety standards under the legally settled procedures. The Company’s estimates and assumptions used to determine fair value can be affected by many factors, such as the estimated costs of inspection and disposal, inflation rate, discount rate, regulations and the general economy. (vi) Provisions for power plant regional support program Power plant regional support programs consist of scholarship programs to local students, local economy support programs, local culture support programs, environment development programs, and local welfare programs. The Company recognizes the provision in relation to power plant regional support program. (vii) Provisions for transmission and transformation facilities-neighboring areas support program The Company has present obligation to conduct transmission and transformation facilities-neighboring areas support program under Act on assistance to transmission and transformation facilities-neighboring areas. The Company recognizes the provision of estimated amount to fulfill the obligation. (viii) Renewable Portfolio Standard (“RPS”) provisions RPS program is required to generate a specified percentage of total electricity to be generated in the form of renewable energy and provisions are recognized for the governmental regulations to require the production of energies from renewable energy sources such as solar, wind and biomass.
Financial instruments	Financial instruments The Company recognizes financial assets and financial liabilities in the statement of financial position when the Company becomes a party to the contractual provisions of the instrument. Upon initial recognition, financial assets and financial liabilities are measured at their fair value plus, in the case of a financial asset or financial liabilities not at fair value through profit or loss, transaction costs that are directly attributable to the asset’s acquisition or issuance. (i) Classification and measurement of financial assets The Company classifies financial assets into three principal categories; measured at amortized cost, fair value through other comprehensive income (FVOCI) and fair value through profit or loss (FVTPL) based on the business model in which assets are managed and their cash flow characteristics. The company assesses the hybrid financial instrument in which derivatives embedded as whole for classification. Cash flow characteristics Business model Solely payments of Other than SPPI To collect contractual cash flows Amortized cost Both collecting contractual cash flows and selling financial assets FVOCI (*1) FVTPL (*2) To sell financial assets FVTPL (*1) To eliminate or reduce an accounting mismatch, the Company may elect to recognize the amount of change in fair value in profit or loss. (*2) On initial recognition of an equity investment that is not held for trading, the Company may irrevocably elect to present subsequent changes in the investment’s fair value in OCI. ① A financial asset is measured at amortized cost if it meets both of the following conditions and is not designated as at FVTPL: 1) it is held within a business model whose objective is to hold assets to collect contractual cash flows; and 2) its contractual terms of the financial asset give rise on specified dates to cash flows that are solely payments of principal and interest on the principal amount outstanding. ② A financial asset is measured at FVOCI if it meets both of the following conditions and is not designated as at FVTPL: 1) it is held within a business model whose objective is achieved by both collecting contractual cash flows and selling financial assets; and 2) its contractual terms of the financial asset give rise on specified dates to cash flow that are solely payments of principal and interest on the principal amount outstanding. ③ All financial assets not classified as measured at amortized cost or FVOCI as described above are measured at FVTPL. On initial recognition of equity investment that is not held for trading, the Company may irrevocably elect to present subsequent changes in fair value in OCI, and will not reclassify (recycle) those items in OCI to profit or loss subsequently. (ii) Classification and measurement of financial liabilities Financial liabilities are classified as FVTPL or other financial liabilities. ① A financial liability is classified as at FVTPL if it is classified as held-for-trading, ② A non-derivative (iii) Impairment: Financial assets and contract assets The Company applies a forward-looking ‘expected credit loss’ (ECL) model for debt instruments, lease receivables, contractual assets, loan commitments and financial guarantee contracts. The Company recognizes loss allowances measured on either of the 12-month Classification Loss allowances Stage 1 Credit risk has not increased significantly since the initial recognition 12-month ECL: ECLs that resulted from possible default events within the 12 months after the reporting date Stage 2 Credit risk has increased significantly since the initial recognition Lifetime ECL: ECL that resulted from all possible default events over the expected life of a financial instrument Stage 3 Credit-impaired Under IFRS 9, the Company always measures the loss allowance at an amount equal to lifetime expected credit losses for trade receivables or contract assets that result from transactions that are within the scope of IFRS 15 and that do not contain a significant financing component in accordance with IFRS 15 and if the trade receivables or contract assets include a significant financing component, the Company may choose as its accounting policy to measure the loss allowance at an amount equal to lifetime expected credit losses. The Company has chosen to measure the loss allowance at an amount equal to lifetime expected credit losses for the trade receivables, contract assets and lease receivables that contain a significant financing component. (iv) Derecognition The Company derecognizes a financial asset when the contractual rights to the cash flows from the financial asset expire, or it transfers the rights to receive the contractual cash flows in a transaction in which substantially all of the risks and rewards of ownership of the financial asset are transferred or in which the Company neither transfers nor retains substantially all of the risks and rewards of ownership and it does not retain control of the financial asset. The Company enters into transactions whereby it transfers assets recognized in its statement of financial position, but retains either all or substantially all of the risks and rewards of the transferred assets. In these cases, the transferred assets are not derecognized. The Company derecognizes a financial liability when its contractual obligations are discharged or cancelled or expire. On derecognition of a financial liability, the difference between the carrying amount extinguished and the consideration paid (including any non-cash
Service Concession Arrangements	Service Concession Arrangements The Company recognizes revenues from construction services and operating services related to service concession arrangements in accordance with IFRS 15 ‘Revenue from Contracts with Customers’. The Company recognizes a financial asset to the extent that it has an unconditional contractual right to receive cash or another financial asset for the construction services and an intangible asset to the extent that it receives a right (license) to charge users of the public service. Borrowing costs attributable to the arrangement are recognized as an expense in the period in which they are incurred unless the Company has a contractual right to receive an intangible asset (a right to charge users of the public service). In this case, borrowing costs attributable to the arrangement are capitalized during the construction phase of the arrangement.
Derivative financial instruments, including hedge accounting	Derivative financial instruments, including hedge accounting The Company enters into a variety of derivative financial instruments to manage its exposure to interest rate and foreign exchange rate risk, including foreign exchange forward contracts, interest rate swaps and cross currency swaps and others. Derivatives are initially recognized at fair value. Subsequent to initial recognition, derivatives are measured at fair value. The resulting gain or loss is recognized in profit or loss immediately unless the derivative is designated and effective as a hedging instrument, in such case the timing of the recognition in profit or loss depends on the nature of the hedge relationship. A derivative with a positive fair value is recognized as a financial asset; a derivative with a negative fair value is recognized as a financial liability. A derivative is presented as a non-current non-current (i) Separable embedded derivatives Derivatives embedded in other financial instruments or other host contracts are treated as separate derivatives when their risks and characteristics are not closely related to those of the host contracts and when the host contracts are not measured at FVTPL. An embedded derivative is presented as a non-current non-current (ii) Hedge accounting The Company designates certain hedging instruments, which include derivatives, embedded derivatives and non-derivatives At the inception of the hedge relationship, the entity documents the relationship between the hedging instrument and the hedged item, along with its risk management objectives and its strategy for undertaking various hedge transactions. Furthermore, at the inception of the hedge and on an ongoing basis, the Company documents whether the hedging instrument is highly effective in offsetting changes in fair values or cash flows of the hedged item. (iii) Fair value hedges Changes in the fair value of derivatives that are designated and qualify as fair value hedges are recognized in profit or loss immediately, together with any changes in the fair value of the hedged asset or liability that are attributable to the hedged risk. The changes in the fair value of the hedging instrument and the change in the hedged item attributable to the hedged risk relating to the hedged items are recognized in the consolidated statements of comprehensive income. Hedge accounting is discontinued when the Company revokes the hedging relationship, when the hedging instrument expires or is sold, terminated, or exercised, or when it no longer qualifies for hedge accounting. The fair value adjustment to the carrying amount of the hedged item arising from the hedged risk is amortized and recognized as profit or loss from that date. (iv) Cash flow hedges The effective portion of changes in the fair value of derivatives that are designated and qualify as cash flow hedges is recognized in other comprehensive income. The gain or loss relating to the ineffective portion is recognized immediately in profit or loss, and is included in the ‘finance income and expense’. Amounts previously recognized in other comprehensive income and accumulated in equity are reclassified to profit or loss in the periods when the hedged item is recognized in profit or loss, in the same line of the consolidated statement of comprehensive income as the recognized hedged item. However, when the forecast transaction that is hedged results in the recognition of a non-financial non-financial non-financial non-financial Hedge accounting is discontinued when the Company revokes the hedging relationship, when the hedging instrument expires or is sold, terminated, or exercised, or it no longer qualifies for hedge accounting. Any gain or loss accumulated in equity at that time remains in equity and is recognized when the forecast transaction is ultimately recognized in profit or loss. When a forecast transaction is no longer expected to occur, the gain or loss accumulated in equity is recognized immediately in profit or loss.

Reporting Entity (Description_2

Reporting Entity (Description of the controlling company) (Tables)	12 Months Ended
	Dec. 31, 2019
Reporting Entity (Description of the controlling company) [Abstract]
The Company's shareholders	As of December 31, 2019, KEPCO’s share capital amounts to ￦3,209,820 million and KEPCO’s shareholders are as follows: Number of Percentage of ownership The Government of the Republic of Korea 116,841,794 18.20 % Korea Development Bank 211,235,264 32.90 % Foreign investors 154,843,683 24.12 % Other 159,043,336 24.77 % 641,964,077 100.00 %

Basis of Preparation (Tables)

Basis of Preparation (Tables)	12 Months Ended
	Dec. 31, 2019
Basis of Preparation [Abstract]
Explanation of initial application of IFRS 16	The impacts on the Company’s consolidated statements of financial position on the date of initial application (January 1, 2019) of IFRS 16 are as follows: Carrying amount Adjustment Carrying amount In millions of won Assets Current assets Cash and cash equivalents ￦ 1,358,345 — 1,358,345 Current financial assets, net 2,359,895 — 2,359,895 Trade and other receivables, net 7,793,592 — 7,793,592 Inventories, net 7,188,253 — 7,188,253 Income tax refund receivables 143,214 — 143,214 Current non-financial 878,888 (3,021 ) 875,867 Assets held-for-sale 22,881 — 22,881 Total current assets 19,745,068 (3,021 ) 19,742,047 Non-current Non-current 2,113,613 — 2,113,613 Non-current 1,819,845 (10 ) 1,819,835 Property, plant and equipment, net 152,743,194 4,947,947 157,691,141 Investment properties, net 159,559 — 159,559 Goodwill 2,582 — 2,582 Intangible assets other than goodwill, net 1,225,942 — 1,225,942 Investments in associates 4,064,820 — 4,064,820 Investments in joint ventures 1,813,525 — 1,813,525 Deferred tax assets 1,233,761 — 1,233,761 Non-current non-financial 327,152 (1,332 ) 325,820 Total non-current 165,503,993 4,946,605 170,450,598 Total Assets ￦ 185,249,061 4,943,584 190,192,645 Carrying amount Adjustment Carrying amount In millions of won Liabilities Current liabilities Trade and other payables, net ￦ 6,405,395 510,304 6,915,699 Current financial liabilities, net 7,981,879 — 7,981,879 Income tax payables 285,420 — 285,420 Current non-financial 5,574,041 — 5,574,041 Current provisions 1,594,798 — 1,594,798 Total current liabilities 21,841,533 510,304 22,351,837 Non-current Non-current 2,941,696 4,433,280 7,374,976 Non-current 53,364,911 — 53,364,911 Non-current non-financial 8,160,033 — 8,160,033 Employee benefits liabilities, net 1,645,069 — 1,645,069 Deferred tax liabilities 9,617,309 — 9,617,309 Non-current 16,585,748 — 16,585,748 Total non-current 92,314,766 4,433,280 96,748,046 Total Liabilities(*) ￦ 114,156,299 4,943,584 119,099,883 Equity Contributed capital ￦ 4,053,578 — 4,053,578 Retained earnings 51,519,119 — 51,519,119 Other components of equity 14,171,228 — 14,171,228 Equity attributable to owners of the controlling company 69,743,925 — 69,743,925 Non-controlling 1,348,837 — 1,348,837 Total Equity ￦ 71,092,762 — 71,092,762 Total Liabilities and Equity ￦ 185,249,061 4,943,584 190,192,645 (*) The adjustment from the total liabilities amounting to ￦4,943,584 is a present value of operating lease payment as of December 31, 2018, discounted by the weighted average interest rate of the lessee’s incremental borrowing rates as of January 1, 2019, and deducted by the present value of short-term leases and low-value

Significant Accounting Polici_3

Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2019
Significant Accounting Policies [Abstract]
Property, plant and equipment, estimated useful lives	The estimated useful lives of the Company’s property, plant and equipment are as follows: Useful lives (years) Buildings 8 ~ 40 Structures 8 ~ 50 Machinery 2 ~ 32 Vehicles 3 ~ 8 Loaded heavy water 30 Asset retirement costs 18, 30, 40, 60 Right-of-use 1 ~ 32 Ships 9 Others 4 ~ 15
Intangible assets, estimated useful lives	The estimated useful lives and amortization methods of the Company’s intangible assets are as follows: Useful lives (years) Amortization methods Usage rights for donated assets 10 ~ 30 Straight line Software 4, 5 Straight line Industrial rights 5 ~ 10 Straight line Development expenses 5 Straight line Leasehold rights 10 Straight line Others 3 ~ 50 or indefinite Straight line Mining right — Unit of production

Segment, Geographic and Other_2

Segment, Geographic and Other Information (Tables)	12 Months Ended
	Dec. 31, 2019
Segment, Geographic and Other Information [Abstract]
Segment determination and explanation of the measurements	Segment determination and explanation of the measurements The Company’s operating segments are its business components that generate discrete financial information that is reported to and regularly reviewed by the Company’s the chief operating decision maker, the Chief Executive Officer, for the purpose of resource allocation and assessment of segment performance. The Company’s reportable segments are ‘Transmission and distribution’, ‘Electric power generation (Nuclear)’, ‘Electric power generation (Non-nuclear)’, Segment operating profit (loss) is determined the same way that consolidated operating profit is determined under IFRS without any adjustment for corporate allocations. The accounting policies used by each segment are consistent with the accounting policies used in the preparation of the consolidated financial statements. Segment assets and liabilities are determined based on separate financial statements of the entities instead of on a consolidated basis. There are various transactions between the reportable segments, including sales of property, plant and equipment and so on, that are conducted on an arm’s-length basis at market prices that would be applicable to an independent third party. For subsidiaries which are in a different segment from that of its immediate parent company, their carrying amount in separate financial statements is eliminated in the consolidating adjustments in the tables below. In addition, consolidation adjustments in the table below include adjustments of the amount of investment in associates and joint ventures from the cost basis amount reflected in segment assets to that determined using equity method in the consolidated financial statements.
Financial information of the segments	Financial information of the segments for the years ended December 31, 2017, 2018 and 2019, respectively, are as follows: 2017 Segment Total Intersegment Revenue Depreciation Interest Interest Profit (loss) Employee Loss on Increase in Operating In millions of won Transmission and distribution ￦ 59,486,766 2,044,160 57,442,606 3,466,410 49,987 737,971 (105,166 ) 158,738 384,595 885,195 1,902,634 Electric power generation (Nuclear) 9,415,752 9,359,468 56,284 3,267,510 21,034 487,503 3,637 80,809 — 801,800 1,347,794 Electric power generation (Non-nuclear) 22,795,816 21,885,251 910,565 2,954,375 18,860 486,176 (6,718 ) 94,075 39,335 171,457 1,523,497 Plant maintenance & engineering service 2,621,440 2,211,716 409,724 109,001 10,801 2,967 (70 ) 87,344 161 219,382 265,593 Others 655,062 138,352 516,710 36,001 130,003 103,782 — 861 — (967 ) 113,296 Consolidation adjustments (35,638,947 ) (35,638,947 ) — (59,586 ) (24,542 ) (28,847 ) — (30,467 ) — (386,747 ) 167,055 ￦ 59,335,889 — 59,335,889 9,773,711 206,143 1,789,552 (108,317 ) 391,360 424,091 1,690,120 5,319,869 Finance income 1,530,618 Finance expense (3,127,952 ) Loss related to associates and joint ventures (108,317 ) Profit before income tax ￦ 3,614,218 2018 Segment Total Intersegment Revenue Depreciation Interest Interest Profitrelated Employee Loss on Increase in Operating In millions of won Transmission and distribution ￦ 59,676,952 1,393,120 58,283,832 3,555,158 77,925 708,329 287,268 144,180 424,774 580,931 (1,814,363 ) Electric power generation (Nuclear) 8,858,717 8,833,787 24,930 3,088,019 30,422 503,161 9,946 76,467 38,886 520,167 357,401 Electric power generation (Non-nuclear) 25,204,085 24,389,816 814,269 3,269,023 29,313 577,441 58,993 91,140 17,516 (227,234 ) 482,418 Plant maintenance & engineering service 2,526,126 2,170,959 355,167 114,030 12,505 4,126 1,956 77,526 — 174,785 314,755 Others 996,300 441,436 554,864 55,513 117,878 119,037 — 1,742 — 356 102,421 Consolidation adjustments (37,229,118 ) (37,229,118 ) — (56,949 ) (44,276 ) (43,636 ) — (30,480 ) — 7,989 (127,741 ) ￦ 60,033,062 — 60,033,062 10,024,794 223,767 1,868,458 358,163 360,575 481,176 1,056,994 (685,109 ) Finance income 796,870 Finance expense (2,470,743 ) Gain related to associates and joint ventures 358,163 Loss before income tax ￦ (2,000,819 ) 2019 Segment Total Intersegment Revenue Depreciation Interest Interest Profit/(loss) Employee Loss on Increase in Operating In millions of won Transmission and distribution ￦ 58,328,372 1,336,725 56,991,647 3,814,428 73,478 777,120 140,757 298,144 350,865 987,828 (2,568,529 ) Electric power generation (Nuclear) 8,937,026 8,908,803 28,223 3,227,695 37,277 511,864 (5,497 ) 132,283 — 672,134 782,511 Electric power generation (Non-nuclear) 24,254,957 23,472,153 782,804 3,955,333 35,626 655,466 77,641 163,626 13,364 766,407 551,287 Plant maintenance & engineering service 2,627,539 2,254,841 372,698 125,546 14,214 2,861 1,237 124,745 — 124,242 312,341 Others 1,049,324 656,614 392,710 127,364 141,262 134,248 — 18,409 4 2,408 (489,585 ) Consolidation adjustments (36,629,136 ) (36,629,136 ) — (121,626 ) (33,739 ) (34,748 ) — (12,087 ) — (251,804 ) (295,552 ) ￦ 58,568,082 — 58,568,082 11,128,740 268,118 2,046,811 214,138 725,120 364,233 2,301,215 (1,707,527 ) Finance income 1,009,706 Finance expense (2,782,156 ) Gain related to associates and joint ventures 214,139 Loss before income tax ￦ (3,265,838 )
Information related to segment assets and liabilities	Information related to segment assets and segment liabilities as of and for the years ended December 31, 2018 and 2019 are as follows: 2018 Segment Segment assets Investments Acquisition of non-current Segment In millions of won Transmission and distribution ￦ 107,486,379 3,671,897 6,323,504 53,404,610 Electric power generation (Nuclear) 55,792,704 43,038 2,187,077 30,484,104 Electric power generation (Non-nuclear) 49,296,392 2,114,203 3,435,222 27,558,156 Plant maintenance & engineering service 3,431,068 49,207 111,393 1,200,390 Others 7,816,885 — 382,978 3,165,286 Segment totals 223,823,428 5,878,345 12,440,174 115,812,546 Consolidation adjustments: Elimination of inter-segment amounts (41,026,970 ) — (62,717 ) (5,055,737 ) Equity method adjustment 964,234 — — — Deferred taxes 2,131 — — (621 ) Others 1,486,238 — — 3,400,111 (38,574,367 ) — (62,717 ) (1,656,247 ) Consolidated totals ￦ 185,249,061 5,878,345 12,377,457 114,156,299 2019 Segment Segment assets Investments Acquisition of non-current Segment In millions of won Transmission and distribution ￦ 109,809,254 3,716,931 6,340,593 58,350,681 Electric power generation (Nuclear) 59,562,190 59,081 2,574,358 33,909,152 Electric power generation (Non-nuclear) 54,758,933 2,088,581 4,955,784 33,117,193 Plant maintenance & engineering service 3,528,879 50,238 95,810 1,124,855 Others 7,833,516 — 344,795 3,531,496 Segment totals 235,492,772 5,914,831 14,311,340 130,033,377 Consolidation adjustments: Elimination of inter-segment amounts (39,207,636 ) — (81,555 ) (6,654,717 ) Equity method adjustment 1,791,844 — — — Deferred taxes 2,048 — — 5,329,158 Others (481,236 ) — — 325 (37,894,980 ) — (81,555 ) (1,325,234 ) Consolidated totals ￦ 197,597,792 5,914,831 14,229,785 128,708,143
Geographic information	Electric sales, the main operations of the Company, are conducted in the Republic of Korea. The following information on revenue from external customers and non-current Geographical unit Revenue from external customers Non-current 2017 2018 2019 2017 2018 2019 In millions of won Domestic ￦ 55,652,807 57,799,991 56,942,128 153,436,810 157,037,428 169,366,365 Overseas(*1) 3,683,082 2,233,071 1,625,954 4,497,535 3,299,346 2,743,755 ￦ 59,335,889 60,033,062 58,568,082 157,934,345 160,336,774 172,110,120 (*1) Middle East and other Asian countries make up the majority of overseas revenue and non-current non-current (*2) Amount excludes financial assets and deferred tax assets.
Information on significant customers	There is no single customer comprising more than 10% of the Company’s revenue for the years ended December 31, 2017, 2018 and 2019.

Classification of Financial I_2

Classification of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2019
Classification of Financial Instruments [Abstract]
Classification of financial assets	Classification of financial assets as of December 31, 2018 and 2019 are as follows: 2018 Financial assets Financial assets Financial assets Derivative assets Total In millions of won Current assets Cash and cash equivalents ￦ — — 1,358,345 — 1,358,345 Current financial assets Current financial assets at fair value through profit or loss 313,893 — — — 313,893 Current financial assets at amortized costs — — 11,956 — 11,956 Current derivative assets 13,936 — — 28,171 42,107 Other financial assets — — 1,991,939 — 1,991,939 Trade and other receivables — — 7,793,592 — 7,793,592 327,829 — 11,155,832 28,171 11,511,832 Non-current Non-current Non-current 607,042 — — — 607,042 Non-current — 399,495 — — 399,495 Non-current — — 2,086 — 2,086 Non-current 23,695 — — 36,533 60,228 Other financial assets — — 1,044,762 — 1,044,762 Trade and other receivables — — 1,819,845 — 1,819,845 630,737 399,495 2,866,693 36,533 3,933,458 ￦ 958,566 399,495 14,022,525 64,704 15,445,290 2019 Financial assets Financial assets Financial assets Derivative assets Total In millions of won Current assets Cash and cash equivalents ￦ — — 1,810,129 — 1,810,129 Current financial assets Current financial assets at fair value through profit or loss 131,385 — — — 131,385 Current financial assets at amortized costs — — 12,302 — 12,302 Current derivative assets 21 — — 27,597 27,618 Other financial assets — — 1,415,204 — 1,415,204 Trade and other receivables — — 7,701,452 — 7,701,452 131,406 — 10,939,087 27,597 11,098,090 Non-current Non-current Non-current 615,876 — — — 615,876 Non-current — 379,170 — — 379,170 Non-current — — 1,307 — 1,307 Non-current 165,183 — — 118,232 283,415 Other financial assets — — 1,283,730 — 1,283,730 Trade and other receivables — — 2,002,297 — 2,002,297 781,059 379,170 3,287,334 118,232 4,565,795 ￦ 912,465 379,170 14,226,421 145,829 15,663,885
Classification of financial liabilities	Classification of financial liabilities as of December 31, 2018 and 2019 are as follows: 2018 Financial liabilities at fair value through profit or loss Financial liabilities Derivative liabilities Total In millions of won Current liabilities Borrowings ￦ — 1,172,624 — 1,172,624 Debt securities — 6,788,824 — 6,788,824 Derivative liabilities 13,706 — 6,725 20,431 Trade and other payables — 6,405,395 — 6,405,395 13,706 14,366,843 6,725 14,387,274 Non-current Borrowings — 3,258,015 — 3,258,015 Debt securities — 49,815,164 — 49,815,164 Derivative liabilities 85,304 — 206,428 291,732 Trade and other payables — 2,941,696 — 2,941,696 85,304 56,014,875 206,428 56,306,607 ￦ 99,010 70,381,718 213,153 70,693,881 2019 Financial liabilities at fair value through profit or loss Financial liabilities Derivative liabilities Total In millions of won Current liabilities Borrowings ￦ — 1,315,134 — 1,315,134 Debt securities — 7,542,705 — 7,542,705 Derivative liabilities 13,286 — 59,778 73,064 Trade and other payables — 6,649,402 — 6,649,402 13,286 15,507,241 59,778 15,580,305 Non-current Borrowings — 3,389,743 — 3,389,743 Debt securities — 55,628,959 — 55,628,959 Derivative liabilities 39,861 — 57,035 96,896 Trade and other payables — 6,965,760 — 6,965,760 39,861 65,984,462 57,035 66,081,358 ￦ 53,147 81,491,703 116,813 81,661,663
Classification of comprehensive income (loss) from financial instruments	Classification of comprehensive income (loss) from financial instruments for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 2018 2019 In millions of won Cash and cash equivalents Interest income ￦ 35,474 40,704 42,861 Financial assets at fair value through profit or loss Interest income — 21,713 29,411 Gain on valuation of derivatives — 34,117 151,604 Gain on transaction of derivatives — 39,114 63,329 Gain on valuation of financial assets — 1,879 1,062 Gain on disposal of financial assets — 1,837 1,760 Financial assets at fair value through profit or loss Interest income 290 — — Gain (loss) on valuation of derivatives (214,100 ) — — Loss on transaction of derivatives (37,266 ) — — Gain on valuation of financial assets 12 — — Financial assets at fair value through other comprehensive income Dividends income — 12,777 13,838 Available-for-sale Dividends income 11,477 — — Impairment loss on available-for-sale (2,713 ) — — Gain (loss) on disposal of available-for-sale (1,213 ) — — Financial assets at amortized cost Interest income — 89 539 Held-to-maturity Interest income 82 — — Loans and receivables Interest income 30,014 21,925 63,448 Trade and other receivables Interest income 102,727 90,390 69,941 Short-term financial instruments Interest income 29,412 41,025 49,070 Long-term financial instruments Interest income 8,144 7,920 12,794 Other financial assets Interest income — 1 54 Derivative assets (applying hedge accounting) Gain (loss) on valuation of derivatives (profit or loss) (41,129 ) 69,799 123,730 Gain on valuation of derivatives (equity, before tax) 2,453 8,600 38,305 Gain (loss) on transaction of derivatives (58,299 ) 34,152 65,651 Financial liabilities at fair value through profit or loss Loss on valuation of derivatives — (4,650 ) 27,686 Gain on transaction of derivatives — 36,046 (493 ) Financial liabilities at fair value through profit or loss Gain (loss) on valuation of derivatives (179,879 ) — — Gain (loss) on transaction of derivatives (27,175 ) — — Financial liabilities carried at amortized cost Interest expense of borrowings and debt securities (1,240,727 ) (1,320,516 ) (1,394,328 ) Loss on retirement of financial liabilities (5 ) — — Interest expense of trade and other payables (57,160 ) (42,830 ) (94,019 ) Interest expense of others (491,665 ) (505,112 ) (558,464 ) Gain (loss) on foreign currency transactions and translations 1,075,215 (356,159 ) (406,175 ) Derivative liabilities (applying hedge accounting) Gain (loss) on valuation of derivatives (profit or loss) (439,559 ) 53,937 14,330 Gain (loss) on valuation of derivatives (equity, before tax) 29,431 (15,029 ) (2,578 ) Gain (loss) on transaction of derivatives (46,221 ) 37,985 (42,072 )

Restricted Deposits (Tables)

Restricted Deposits (Tables)	12 Months Ended
	Dec. 31, 2019
Restricted Deposits [Abstract]
Restricted Deposits	Restricted deposits as of December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Cash and cash equivalents Deposits for government project ￦ 12,747 9,287 Collateral provided for borrowings 100,998 63,198 Collateral provided for lawsuit 3 3 Deposits for transmission regional support program 4,337 3,002 Decommissioning costs of nuclear power plants 604 — Short-term financial instruments Restriction on withdrawal related to ‘win-win 34,000 93,000 Current financial assets at fair value through profit or loss Decommissioning costs of nuclear power plants 29,451 — Non-current Decommissioning costs of nuclear power plants 498,555 541,969 Long-term financial instruments Escrow accounts 69 74 Guarantee deposits for banking accounts at oversea branches 315 326 Collateral provided for borrowings — 11,745 Decommissioning costs of nuclear power plants 245,896 250,464 Funds for developing small and medium enterprises(*) 200,000 200,000 ￦ 1,126,975 1,173,068 (*) Deposits for small and medium enterprises at the Industrial Bank of Korea (IBK) and others for construction of Bitgaram Energy Valley businesses as of December 31, 2018 and 2019.

Cash and Cash Equivalents (Tabl

Cash and Cash Equivalents (Tables)	12 Months Ended
	Dec. 31, 2019
Cash and Cash Equivalents [Abstract]
Cash and Cash Equivalents	Cash and cash equivalents as of December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Cash ￦ 138 266 Other demand deposits 927,650 1,117,499 Short-term deposits classified as cash equivalents 211,424 527,235 Short-term investments classified as cash equivalents 219,133 165,129 ￦ 1,358,345 1,810,129

Trade and Other Receivables (Ta

Trade and Other Receivables (Tables)	12 Months Ended
	Dec. 31, 2019
Trade and Other Receivables [Abstract]
Trade and Other Receivables	Trade and other receivables as of December 31, 2018 and 2019 are as follows: 2018 Gross Allowance for Present value discount Book In millions of won Current assets Trade receivables ￦ 7,303,065 (215,775 ) — 7,087,290 Other receivables 728,560 (20,231 ) (2,027 ) 706,302 8,031,625 (236,006 ) (2,027 ) 7,793,592 Non-current Trade receivables 415,318 (93 ) (448 ) 414,777 Other receivables 1,496,464 (84,495 ) (6,901 ) 1,405,068 1,911,782 (84,588 ) (7,349 ) 1,819,845 ￦ 9,943,407 (320,594 ) (9,376 ) 9,613,437 2019 Gross Allowance for Present value discount Book In millions of won Current assets Trade receivables ￦ 7,147,683 (208,505 ) — 6,939,178 Other receivables 792,147 (27,579 ) (2,294 ) 762,274 7,939,830 (236,084 ) (2,294 ) 7,701,452 Non-current Trade receivables 338,261 (4,254 ) (382 ) 333,625 Other receivables 1,759,930 (86,576 ) (4,682 ) 1,668,672 2,098,191 (90,830 ) (5,064 ) 2,002,297 ￦ 10,038,021 (326,914 ) (7,358 ) 9,703,749
Other receivables	Other receivables as of December 31, 2018 and 2019 are as follows: 2018 Gross Allowance for Present value Book In millions of won Current assets Non-trade ￦ 298,587 (19,940 ) — 278,647 Accrued income 102,023 — — 102,023 Deposits 228,466 — (2,027 ) 226,439 Finance lease receivables 84,688 (291 ) — 84,397 Others 14,796 — — 14,796 728,560 (20,231 ) (2,027 ) 706,302 Non-current Non-trade 136,432 (77,475 ) — 58,957 Deposits 376,211 — (6,901 ) 369,310 Finance lease receivables 898,658 (842 ) — 897,816 Others 85,163 (6,178 ) — 78,985 1,496,464 (84,495 ) (6,901 ) 1,405,068 ￦ 2,225,024 (104,726 ) (8,928 ) 2,111,370 2019 Gross Allowance for Present value Book In millions of won Current assets Non-trade ￦ 376,438 (27,201 ) — 349,237 Accrued income 68,921 — — 68,921 Deposits 273,887 — (2,294 ) 271,593 Finance lease receivables 60,304 (378 ) — 59,926 Others 12,597 — — 12,597 792,147 (27,579 ) (2,294 ) 762,274 Non-current Non-trade 196,821 (78,654 ) — 118,167 Accrued income 2,222 — — 2,222 Deposits 338,989 — (4,682 ) 334,307 Finance lease receivables 1,118,537 (484 ) — 1,118,053 Others 103,361 (7,438 ) — 95,923 1,759,930 (86,576 ) (4,682 ) 1,668,672 ￦ 2,552,077 (114,155 ) (6,976 ) 2,430,946
Aging analysis of trade receivables	Aging analysis of trade receivables as of December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Trade receivables: (not overdue) ￦ 7,419,648 7,338,757 Trade receivables: (overdue, not impaired) — — Less than 60 days — — Trade receivables: (impairment reviewed) 298,735 147,187 Less than 60 days 2,525 6,555 60 ~ 90 days 37,266 1,899 90 ~ 120 days 16,033 2,106 120 days ~ 1 year 46,204 37,357 Over 1 year 196,707 99,270 7,718,383 7,485,944 Less: allowance for doubtful accounts (215,868 ) (212,759 ) Less: present value discount (448 ) (382 ) ￦ 7,502,067 7,272,803 At the end of each reporting period, the Company assesses whether the credit to trade receivables is impaired. The Company recognizes loss allowances for trade receivables individually when there is any objective evidence that trade receivables are impaired and significant and classifies the trade receivables that are not individually assessed as the trade receivables subject to be assessed on a collective basis. Also, from January 1, 2018, the Company recognizes loss allowances based on an ‘expected credit loss’ (ECL) model.
Aging analysis of other receivables	Aging analysis of other receivables as of December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Other receivables: (not overdue) ￦ 2,075,601 2,327,640 Other receivables: (overdue, not impaired) — — Less than 60 days — — Other receivables: (impairment reviewed) 149,423 224,437 Less than 60 days 24,782 98,220 60 ~ 90 days 1,007 2,034 90 ~ 120 days 10,997 14,135 120 days ~ 1 year 23,991 26,212 Over 1 year 88,646 83,836 2,225,024 2,552,077 Less: allowance for doubtful accounts (104,726 ) (114,155 ) Less: present value discount (8,928 ) (6,976 ) ￦ 2,111,370 2,430,946 At the end of each reporting period, the Company assesses whether the credit to other receivables is impaired. The Company recognizes loss allowances for other receivables individually when there is any objective evidence that trade receivables are impaired and significant, and classifies the other receivables that are not individually assessed as the other receivables subject to be assessed on a collective basis. Also, from January 1, 2018, the Company recognizes loss allowances based on an ‘expected credit loss’ (ECL) model.
Changes in the allowance for doubtful accounts	Changes in the allowance for doubtful accounts for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 2018 2019 Trade Other Trade Other Trade Other In millions of won Beginning balance ￦ 71,985 87,661 173,583 78,008 215,868 104,726 Effect of change in accounting policy — — 6,641 128 — — Loss allowance as at January 1 under IFRS 9 — — 180,224 78,136 215,868 104,726 Bad debt expense 126,714 1,778 41,498 17,817 29,221 19,206 Write-off (32,995 ) (3,129 ) (7,696 ) (244 ) (10,106 ) (1,146 ) Reversal — (2,166 ) (1,726 ) (143 ) (41,940 ) — Others 7,879 (6,136 ) 3,568 9,160 19,716 (8,631 ) Ending balance ￦ 173,583 78,008 215,868 104,726 212,759 114,155

Financial Assets at Fair Valu_3

Financial Assets at Fair Value through Profit or Loss (Tables)	12 Months Ended
	Dec. 31, 2019
Financial assets at fair value through profit or loss [Abstract]
Financial Assets at Fair Value through Profit or Loss	Financial assets at fair value through profit or loss as of December 31, 2018 and 2019 are as follows: 2018 2019 Current Non-current Current Non-current In millions of won Financial assets at fair value through profit or loss Beneficiary certificate ￦ 100 320,148 894 160,952 Cooperative — 5,052 — 5,155 Other 313,793 83,586 130,491 244,857 313,893 408,786 131,385 410,964 Financial assets designated as at fair value through profit or loss Debt with embedded derivatives — 187,483 — 150,916 Other — 10,773 — 53,996 — 198,256 — 204,912 ￦ 313,893 607,042 131,385 615,876
Gains (losses) on financial assets at fair value through profit or loss	Details of gain (loss) from financial assets at fair value through profit or loss for the years ended December 31, 2019 and 2018 are as follows: 2018 2019 In millions of won Beneficiary certificate ￦ 6,892 12,458 Cooperative 626 76 Debt with embedded derivatives 4,804 2,697 Other 13,108 17,002 ￦ 25,430 32,233

Financial Assets at Fair Valu_4

Financial Assets at Fair Value through Other Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2019
Financial assets at fair value through other comprehensive income [Abstract]
Changes in financial assets at fair value through other comprehensive income	Changes in financial assets at fair value through other comprehensive income for the years ended December 31, 2018 and 2019 are as follows: 2018 Beginning Effect of accounting policy Acquisition Disposal Valuation Impairment Others Ending In millions of won Listed ￦ — 274,453 — (1 ) (63,007 ) — (1,389 ) 210,056 Unlisted — 197,450 — — (12,070 ) — 4,059 189,439 ￦ — 471,903 — (1 ) (75,077 ) — 2,670 399,495 Current financial assets at fair value through other comprehensive income ￦ — — — — — — — — Non-current — 471,903 — (1 ) (75,077 ) — 2,670 399,495 2019 Beginning Acquisition Disposal Valuation Impairment Others Ending In millions of won Listed ￦ 210,055 — — (11,734 ) — 2,880 201,201 Unlisted 189,439 1,876 (19,315 ) 3,715 — 2,254 177,969 ￦ 399,494 1,876 (19,315 ) (8,019 ) — 5,134 379,170 Current financial assets at fair value through other comprehensive income ￦ — — — — — — — Non-current 399,494 1,876 (19,315 ) (8,019 ) — 5,134 379,170
Financial Assets at Fair Value through Other Comprehensive Income	Financial assets at fair value through other comprehensive income as of December 31, 2018 and 2019 are as follows: 2018 Shares Ownership Acquisition Book value Fair value In millions of won Listed Korea District Heating Corp. 2,264,068 19.55 % ￦ 173,201 129,051 129,051 Ssangyong Motor Co., Ltd. 38,568 0.03 % 428 153 153 SM Korea Line Corp. 18 0.00 % 1 — — Namkwang Engineering & Construction Co., Ltd. 121 0.00 % 15 1 1 Bumyang Construction Co., Ltd. 35 0.00 % 2 — — ELCOMTEC Co., Ltd. 32,875 0.04 % 217 61 61 PAN ocean Co., Ltd. 1,492 0.00 % 14 7 7 Dongbu Corp. 955 0.02 % 12 7 7 KSP Co., Ltd. 22,539 0.08 % 24 32 32 STX Heavy Industries Co., Ltd. 5,057 0.13 % 191 29 29 Codes Combine Co., Ltd. 291 0.00 % 1 1 1 PT Adaro Energy Tbk 480,000,000 1.50 % 71,554 44,790 44,790 Energy Fuels Inc. 1,711,814 1.91 % 16,819 5,435 5,435 Bunji Corporation Limited (formerly, Baralaba Coal Company Limited) 99,763 0.07 % 18,445 — — Denison Mines Corp. 58,284,000 10.42 % 84,134 30,122 30,122 Fission 3.0(*6) 75,000 0.14 % — 13 13 Fission Uranium Corp. 800,000 0.16 % 785 354 354 365,843 210,056 210,056 Unlisted Intellectual Discovery Co., Ltd. 1,000,000 8.81 % ￦ 5,000 954 954 Hwan Young Steel Co., Ltd. 10,916 0.14 % 1,092 97 97 SAMBO AUTO. Co., Ltd. 15,066 0.02 % 38 38 38 Mobo Co., Ltd. 504 0.00 % 14 14 14 Dae Kwang Semiconductor Co., Ltd. 589 0.07 % 6 6 6 Sanbon Department Store 828 0.01 % 124 3 3 Miju Steel Mfg. Co., Ltd. 1,097 0.23 % 50 50 50 Sungwon Co., Ltd.(*7) 117 0.07 % 15 15 15 Hana Civil Engineering Co., Ltd. 23 0.00 % 1 1 1 KC Development Co., Ltd. 839 0.02 % 6 6 6 IMHWA Corp. 329 0.11 % 5 5 5 DALIM Special Vehicle Co., Ltd. 58 0.08 % 10 10 10 ASA JEONJU Co., Ltd. 34,846 1.34 % 697 69 69 Moonkyung Silica Co., Ltd. 42 0.56 % — — — Sungkwang Timber Co., Ltd. 9 0.34 % 4 4 4 Yongbo Co., Ltd. 61 0.20 % 3 3 3 HJ Steel Co., Ltd. 218 0.07 % 2 2 2 KS Remicon Co., Ltd. 12 0.04 % 3 3 3 Joongang Platec Co., Ltd. 3,591 0.75 % 72 35 35 Pyungsan SI Ltd. 434 0.01 % 9 9 9 Samgong Development Co., Ltd. 12 0.01 % 7 7 7 Joongang Development Co., Ltd. 540 0.12 % 8 8 8 2018 Shares Ownership Acquisition Book value Fair value In millions of won AJS Co., Ltd. 12,906 0.23 % ￦ 32 32 32 SHIN-E 119 0.13 % 10 — — MSE Co., Ltd. 429 0.13 % 9 9 9 Ilrim Nano Tec Co., Ltd. 1,520 0.07 % 15 15 15 Youngjin Hi-Tech 2,512 0.25 % 126 21 21 Buyoung Co., Ltd. 270 0.00 % 3 3 3 Ilsuk Co., Ltd. 152 0.17 % 10 10 10 Dongyang Telecom Co., Ltd. 1,760 0.01 % 11 11 11 Jongwon Remicon Co., Ltd. 31 0.18 % 13 13 13 Zyle Daewoo Motor Sales Co., Ltd. 22 0.00 % — — — Daewoo Development Co., Ltd. 8 0.00 % — — — Seyang Inc. 537 0.05 % 27 27 27 Seungri Enterprise Co., Ltd. 93 0.05 % 3 3 3 Onggane Food Co., Ltd 5 0.07 % 1 1 1 Shin-E 1,569 0.64 % 111 3 3 Ejung Ad Co., Ltd. 132 0.09 % 3 3 3 Solvus Co., Ltd. 1,056 0.04 % 3 3 3 Myung Co., Ltd. 89 0.05 % 2 2 2 Shinil Engineering Co., Ltd. 887 0.06 % 3 3 3 Biwang Industry Co., Ltd 406 0.04 % 2 2 2 Huimun Co., Ltd. 263 0.26 % 4 4 4 Young Sung Co., Ltd. 89 0.40 % 26 26 26 Yuil Industrial Electronics Co., Ltd. 804 0.32 % 15 15 15 DN TEK Inc. 12,401 0.29 % 61 5 5 Kwang Jin Structure Co., Ltd. 3,072 0.60 % 31 31 31 Woojin Industry Corporation 3 0.00 % 16 16 16 Kwang Sung Industry Co., Ltd. 325 0.35 % 7 7 7 Futech Mold Co., Ltd. 274 0.27 % 14 14 14 Woojoo Environment Ind. Co., Ltd. 101 0.11 % 13 13 13 Hyungji Esquire Co., Ltd. 61 0.02 % 22 22 22 Kolmar Pharma Co., Ltd. 1,426 0.01 % 52 3 3 Morado Co., Ltd. 209 0.04 % 2 2 2 Myung Sung Tex Co., Ltd. 20 0.00 % 2 2 2 Kwang Sung Co., Ltd. 610 0.53 % 31 31 31 Seen Business and Technology co., Ltd. (formerly, EverTechno. Co.,Ltd.) 29,424 0.73 % 148 7 7 Autowel Co.,Ltd. 260 0.38 % 14 14 14 Woobang Construction Co., Ltd. 8 0.00 % 8 8 8 Shin Pyung Co., Ltd. 6 0.03 % 3 3 3 JMC Heavy Industries Co., Ltd. 2,724 0.10 % 27 2 2 Najin Steel Co., Ltd. 37 0.06 % 5 5 5 Sinkwang Industry Co., Ltd. 1,091 1.68 % 5 5 5 Crystal Co., Ltd. 22 0.07 % 2 2 2 2018 Shares Ownership Acquisition Book value Fair value In millions of won Elephant & Friends Co., Ltd. 563 0.61 % ￦ 3 3 3 Mireco Co., Ltd. 109 0.25 % 11 11 11 L&K Industry Co., Ltd. 1,615 0.60 % 24 24 24 JO Tech Co., Ltd. 1,263 0.62 % 25 25 25 Kendae Printing Co., Ltd. 422 0.60 % 21 21 21 Dauning Co., Ltd. 231 0.41 % 6 6 6 Korea Trecision Co., Ltd. 22 0.45 % 5 5 5 Ace Track Co., Ltd. 3,130 1.08 % 219 59 59 Yoo-A 105 0.20 % 11 11 11 Dung Hwan Co., Ltd. 531 0.02 % 5 5 5 Hurim Biocell Co., Ltd. 1,021 0.00 % 5 5 5 Smart Power Co.,Ltd. 133,333 4.35 % 200 200 200 Sunjin Power Tech Co., Ltd. 4,941 0.92 % 247 32 32 Haseung Industries Co.,Ltd. 55 0.62 % 28 28 28 Beer Yeast Korea Inc. 1,388 0.43 % 7 7 7 Korea Bio Red Ginseng Co.,Ltd. 194 0.09 % 10 10 10 B CON Co.,Ltd. 96 1.16 % 6 6 6 SsangMa Machine Co., Ltd. 4 0.05 % 1 1 1 Ace Integration Co., Ltd 105 0.09 % 24 24 24 AceInti Agricultural Co., Ltd. 16 0.02 % 5 5 5 KyungDong Co., Ltd. 130 0.01 % 1 1 1 ChunWon Development Co., Ltd. 193 0.19 % 39 39 39 WonIl Co., Ltd. 999 0.15 % 50 50 50 SungLim Industrial Co., Ltd. 29 0.03 % 1 1 1 Korea Minerals Co., Ltd. 191 0.05 % 134 1 1 HyoDong Development Co., Ltd. 119 0.15 % 24 24 24 Haspe Tech Co., Ltd. 652 0.55 % 20 20 20 JoHyun Co., Ltd. 350 1.56 % 18 18 18 KC Co., Ltd. 5,107 0.17 % 26 26 26 SeongJi Industrial Co.,Ltd. 41 0.05 % 1 1 1 Dong Yang Metal Co., Ltd. 2,951 1.97 % 161 147 147 Seyang Precision Ind.Co., Ltd. 829 0.23 % 41 41 41 Dooriwon Food System Co., Ltd. 13 0.27 % 1 1 1 ShinShin Co., Ltd 339 1.12 % 17 17 17 Kitorang Co., Ltd. 165 0.24 % 49 49 49 Sung Kwang Co., Ltd. 23 0.37 % 6 6 6 Shinheung petrol. Co. Ltd. 699 0.14 % 35 35 35 Force TEC Co., Ltd. 3,501 0.02 % 18 18 18 Samsung Tech Co., Ltd. 486 1.28 % 97 36 36 Tae Hyung Co., Ltd. 28 0.43 % 20 20 20 Samyangplant Co., Ltd. 323 0.60 % 16 16 16 Younil Metal Co., Ltd. 41 0.21 % 21 21 21 Myungjin Tech Co., Ltd. 20 0.54 % 4 4 4 2018 Shares Ownership Acquisition Book value Fair value In millions of won Hankook Precision Ind Co., Ltd. 110 0.06 % ￦ 11 11 11 Borneo International Furniture Co., Ltd.(*4) 4,000 0.16 % 97 13 13 CJ Paradise Co.,Ltd 24 0.02 % 12 12 12 Han Young Technology Company Co.,Ltd. 35 0.00 % — — — STX Offshore & Shipbuilding Co., Ltd 8,622 0.25 % 1,078 1,078 1,078 Ptotronics Co., Ltd. 843 0.42 % 84 6 6 NFT Co., Ltd. 136 0.40 % 8 8 8 Echoroba Co.,Ltd. 157 0.02 % 3 3 3 Hyundaitech Co.,Ltd. 1,363 0.87 % 27 27 27 Dasan Material Co.Ltd. 29 0.04 % 22 22 22 Fish World Co.,Ltd. 47 0.21 % 2 2 2 SG Shinsung Engineering and Construction Co., Ltd. 10 0.00 % 6 6 6 Samdo Industry Electric Co.,Ltd. 48 0.02 % 1 1 1 Taejung Industries Co.,Ltd. 9,268 0.30 % 5 5 5 Shinsei Trading Co., Ltd. 64 0.72 % 6 6 6 Dynamic Co., Ltd. 111 0.19 % 3 3 3 Green Alchemy Co.,Ltd. 38,202 1.48 % 191 17 17 Youone TBM Engineering & Construction Co., Ltd. 615 0.27 % 31 31 31 KM Leatech Co., Ltd. 1,648 0.98 % 8 8 8 Wonil T&I Co., Ltd. 229 0.17 % 23 23 23 Semist Co.,Ltd. 555 0.80 % 3 3 3 DS POWER Co., Ltd. 580,000 2.34 % 2,900 916 916 Sewon Bus Co.,Ltd 12 0.00 % — — — Enertec Co., Ltd. 7,937 0.19 % 44 44 44 Sangji Co., Ltd. 20 0.26 % 4 4 4 Bellie Doughnuts Co., Ltd. 64 0.07 % 4 4 4 Possbell Engineering Co., Ltd. 36 0.64 % 1 1 1 AIRTECH Information communication Co., Ltd 2,379 0.60 % 12 12 12 CST co.,ltd. 4,998 0.28 % 100 100 100 TN Inc. 1,416 2.00 % 71 71 71 Shin kwang Industrial Co., Ltd. 884 0.35 % 55 55 55 Kiscom Co., Ltd. 1,493 0.04 % 1 1 1 Seil Electronics Co.,Ltd. 2,285 0.41 % 286 286 286 Wonil laser Co., Ltd 157 0.37 % 16 16 16 Pyung Hwa Industrial Co.,Ltd. 3,388 3.00 % 85 85 85 Navanakorn Electric Co., Ltd.(*2) 4,442,800 26.93 % 17,216 17,126 17,126 PT. Kedap Saayq 671 10.00 % 18,540 — — Set Holding(*3) 1,100,220 2.50 % 229,255 161,983 161,983 PT. Cirebon Energi Prasarana 22,420 10.00 % 2,612 2,507 2,507 KODE NOVUS 1 LLC(*5) — 10.00 % — — — Choheung packing Co.,Ltd. 61 0.13 % 12 12 12 2018 Shares Ownership Acquisition Book value Fair value In millions of won Jaewoo Co., Ltd. 359 0.24 % ￦ 11 11 11 Wooyang HC Co., Ltd(*8) 1,375 0.01 % 159 159 159 Sungsan Parts Co., Ltd. 629 0.80 % 63 63 63 KMT Co., Ltd. 1,411 0.93 % 21 21 21 TheYeonriji Co., Ltd. 116 0.10 % 6 6 6 Flusys Co., Ltd. 9 0.08 % 2 2 2 DaeSung Frontier Co., Ltd. 2,203 1.11 % 221 221 221 DongSeo Electronics Co., Ltd. 323 0.07 % 16 16 16 Daewoo Display Co., Ltd. 177 0.03 % 5 5 5 Yeong-gwang Remicon Co., Ltd. 15 0.12 % 2 2 2 NTS Co., Ltd. 143 0.22 % 36 36 36 AID CO.,LTD. 1,212 0.57 % 36 36 36 Changwon Eco-friendly 3 0.01 % — — — Kumo Hitech Co., Ltd. 6,697 0.53 % 100 100 100 Kyung Pyo Industry Co., Ltd. 186 0.76 % 19 19 19 Daedong Industry Co., Ltd. 617 0.55 % 46 46 46 Doosung Heavy Industries Co., Ltd. 53 0.06 % 5 5 5 Jangback Testiles Co., Ltd. 494 5.05 % 49 49 49 Samjoo Hightech Co., Ltd. 522 0.08 % 3 3 3 Samkwang Chemical Co., Ltd. 204 1.27 % 51 51 51 Taekwang Industry Co., Ltd. 1,327 0.48 % 93 93 93 Taekwang Precision Co., Ltd. 54 0.47 % 54 54 54 SG Corp. 213 0.54 % 21 21 21 Shinseung Chemical Industy Co., Ltd. 5 0.01 % 60 60 60 KJ Alloy Co., Ltd. 368 0.20 % 7 7 7 SM Hi-tech 22 0.39 % 22 22 22 Keum Mun Industry Co., Ltd. 1,320 0.97 % 330 330 330 Puruen Environment Co., Ltd. 967 1.34 % 19 19 19 Miretech Co., Ltd. 9,111 0.27 % 18 18 18 SIE Co., Ltd. 12 0.02 % 1 1 1 Soongwon Ind. Co., Ltd. 150 0.40 % 53 53 53 Sejin Hightech Co., Ltd. 17,980 0.16 % 18 18 18 Namcheong Corp. 7,096 0.28 % 284 284 284 Eun Sung Enterprise Co. 1,131 0.72 % 17 17 17 Dongdo Basalt Industry Co., Ltd. 182 1.50 % 73 73 73 Shinyoung Textiles Co., Ltd. 523 1.01 % 52 52 52 Bugook Cast Iron Co. 135 0.71 % 14 14 14 Ilwoo Steel Co., Ltd. 41 0.28 % 17 17 17 Dong-un 1,159 6.28 % 81 81 81 Wongwang Door Corp. 575 1.00 % 29 29 29 284,670 189,439 189,439 — ￦ 650,513 399,495 399,495 (*1) The Company used initial cost as their fair value because there was not enough information to determine fair value, and the range of the estimated fair value is wide. (*2) Although the Company holds more than 20% of the equity shares of these investments, the Company is unable to exercise significant influence. (*3) The Company has estimated the fair value of Set Holding by using the discounted cash flow method and has recognized the difference between its fair value and book value as gain or loss on valuation of available-for-sale (*4) The number of shares owned has changed due to capital reduction without refund (3:1), consolidation of stocks (10,000:1), and split of stock (1:2,000) during the year ended December 31, 2018. (*5) As described in note 20, this is reclassified to financial assets at fair value through other comprehensive income due to loss of significant influence of the Company. (*6) The number of shares owned has changed due to the stock merge (4:1) during the year ended December 31, 2018. (*7) The number of shares owned has changed due to the stock merge (5:1) during the year ended December 31, 2018. (*8) The number of shares owned has changed due to the stock merge (10:1) during the year ended December 31, 2018. 2019 Shares Ownership Acquisition Book value Fair value In millions of won Listed Korea District Heating Corp. 2,264,068 19.55 % ￦ 173,201 107,090 107,090 Ssangyong Motor Co., Ltd. 38,568 0.03 % 428 80 80 SM Korea Line Corp. 18 0.00 % 1 — — Namkwang Engineering & Construction Co., Ltd. 121 0.00 % 15 1 1 Bumyang Construction Co., Ltd. 35 0.00 % 2 — — ELCOMTEC Co., Ltd. 32,875 0.04 % 217 52 52 PAN Ocean Co., Ltd. 1,492 0.00 % 14 7 7 Dongbu Corp. 955 0.00 % 12 8 8 KSP Co., Ltd. 22,539 0.06 % 24 40 40 STX Heavy Industries Co., Ltd. 8,639 0.03 % 213 26 26 Codes Combine Co., Ltd. 291 0.00 % 1 1 1 PT Adaro Energy Tbk 480,000,000 1.50 % 65,028 62,026 62,026 Energy Fuels Inc. 1,711,814 1.91 % 16,819 3,764 3,764 Bunji Corporation Limited (formerly, Baralaba Coal Company Limited) 99,763 0.07 % 18,445 — — Denison Mines Corp. 58,284,000 10.42 % 84,134 27,903 27,903 Fission 3.0 75,000 0.14 % — 5 5 Fission Uranium Corp. 800,000 0.16 % 785 199 199 359,339 201,202 201,202 2019 Shares Ownership Acquisition Book value Fair value In millions of won Unlisted Intellectual Discovery Co., Ltd. 1,000,000 6.00 % ￦ 5,000 954 954 Hwan Young Steel Co., Ltd. 10,916 0.14 % 1,092 97 97 SAMBO AUTO. Co., Ltd. 15,066 0.02 % 38 38 38 Mobo Co., Ltd. 504 0.00 % 14 14 14 Dae Kwang Semiconductor Co., Ltd. 589 0.07 % 6 6 6 Sanbon Department Store 828 0.01 % 124 3 3 Miju Steel Mfg. Co., Ltd. 1,097 0.23 % 50 50 50 Sungwon Co., Ltd. 117 0.07 % 15 15 15 Hana Civil Engineering Co., Ltd. 23 0.00 % 1 1 1 KC Development Co., Ltd. 839 0.02 % 6 6 6 IMHWA Corp. 329 0.11 % 5 5 5 DALIM Special Vehicle Co., Ltd. 58 0.08 % 10 10 10 ASA JEONJU Co., Ltd. 34,846 1.34 % 697 69 69 Moonkyung Silica Co., Ltd. 42 0.56 % — — — Sungkwang Timber Co., Ltd. 3 0.08 % 5 5 5 Yongbo Co., Ltd. 61 0.20 % 3 3 3 HJ Steel Co., Ltd. 218 0.07 % 2 2 2 KS Remicon Co., Ltd. 12 0.04 % 3 3 3 Joongang Platec Co., Ltd. 3,591 0.75 % 72 35 35 Pyungsan SI Co., Ltd. 434 0.01 % 9 9 9 Samgong Development Co., Ltd. 12 0.01 % 7 7 7 Joongang Development Co., Ltd. 540 0.12 % 8 8 8 AJS Co., Ltd. 12,906 0.23 % 32 32 32 MSE Co., Ltd. 429 0.13 % 9 9 9 Ilrim Nano Tec Co., Ltd. 1,520 0.07 % 15 15 15 Youngjin Hi-Tech 2,512 0.25 % 126 21 21 Buyoung Co., Ltd. 270 0.00 % 3 3 3 Ilsuk Co., Ltd. 152 0.17 % 10 10 10 Dongyang Telecom Co., Ltd. 1,760 0.01 % 11 11 11 Jongwon Remicon Co., Ltd. 31 0.18 % 13 13 13 Zyle Daewoo Motor Sales Co., Ltd. 22 0.00 % — — — Daewoo Development Co., Ltd. 8 0.00 % — — — Seyang Inc. 537 0.05 % 27 27 27 Seungri Enterprise Co., Ltd. 93 0.05 % 3 3 3 Onggane Food Co., Ltd 5 0.07 % 1 1 1 Shin-E 1,569 0.64 % 111 3 3 Ejung Ad Co., Ltd. 132 0.09 % 3 3 3 Solvus Co., Ltd. 1,056 0.04 % 3 3 3 Myung Co., Ltd. 89 0.05 % 2 2 2 Shinil Engineering Co., Ltd. 887 0.06 % 3 3 3 Biwang Industry Co., Ltd 406 0.04 % 2 2 2 Young Sung Co., Ltd. 89 0.40 % 27 27 27 2019 Shares Ownership Acquisition Book value Fair value In millions of won Yuil Industrial Electronics Co., Ltd. 804 0.32 % ￦ 16 16 16 DN TEK Inc. 12,401 0.29 % 62 6 6 Woojin Industry Corporation 3 0.00 % 16 16 16 Kwang Sung Industry Co., Ltd. 325 0.35 % 7 7 7 Futech Mold Co., Ltd. 274 0.27 % 14 14 14 Woojoo Environment Ind. Co., Ltd. 101 0.11 % 13 13 13 Hyungji Esquire Co., Ltd. 61 0.02 % 22 22 22 Kolmar Pharma Co., Ltd. 1,426 0.01 % 52 3 3 Morado Co., Ltd. 209 0.04 % 2 2 2 Myung Sung Tex Co., Ltd. 20 0.00 % 2 2 2 Kwang Sung Co., Ltd. 610 0.53 % 31 31 31 Seen Business and Technology co., Ltd. 29,424 0.73 % 147 7 7 Woobang Construction Co., Ltd. 8 0.00 % 8 8 8 Shin Pyung Co., Ltd. 6 0.03 % 3 3 3 JMC Heavy Industries Co., Ltd. 2,724 0.10 % 27 2 2 Najin Steel Co., Ltd. 37 0.06 % 5 5 5 Sinkwang Industry Co., Ltd. 1,091 1.68 % 5 5 5 Elephant & Friends Co., Ltd. 563 0.61 % 3 3 3 Mireco Co., Ltd. 109 0.25 % 11 11 11 L&K Industry Co., Ltd. 1,615 0.60 % 24 24 24 JO Tech Co., Ltd. 1,263 0.62 % 25 25 25 Kendae Printing Co., Ltd. 422 0.60 % 21 21 21 Dauning Co., Ltd. 231 0.41 % 6 6 6 Korea Trecision Co., Ltd. 22 0.45 % 5 5 5 Ace Track Co., Ltd. 3,130 1.08 % 219 59 59 Yoo-A 105 0.20 % 11 11 11 Dung Hwan Co., Ltd. 531 0.02 % 5 5 5 Hurim Biocell Co., Ltd. 1,021 0.00 % 5 5 5 Smart Power Co.,Ltd. 133,333 4.14 % 200 200 200 Sunjin Power Tech Co., Ltd. 4,941 0.92 % 247 32 32 Haseung Industries Co.,Ltd. 55 0.62 % 28 28 28 Beer Yeast Korea Inc. 1,388 0.43 % 7 7 7 B CON Co.,Ltd. 96 1.16 % 6 6 6 Ace Integration Co., Ltd 105 0.09 % 23 23 23 AceInti Agricultural Co., Ltd. 16 0.02 % 5 5 5 KyungDong Co., Ltd. 130 0.01 % 1 1 1 ChunWon Development Co., Ltd. 193 0.19 % 39 39 39 SungLim Industrial Co., Ltd. 29 0.03 % 1 1 1 Korea Minerals Co., Ltd. 191 0.05 % 135 1 1 HyoDong Development Co., Ltd. 128 0.15 % 25 25 25 Haspe Tech Co., Ltd. 652 0.55 % 20 20 20 JoHyun Co., Ltd. 350 1.56 % 18 18 18 KC Co., Ltd. 5,107 0.17 % 26 26 26 2019 Shares Ownership Acquisition Book value Fair value In millions of won SeongJi Industrial Co.,Ltd. 41 0.05 % ￦ 1 1 1 Dong Yang Metal Co., Ltd. 2,951 1.97 % 161 148 148 Seyang Precision Ind.Co., Ltd. 829 0.23 % 41 41 41 Dooriwon Food System Co., Ltd. 13 0.27 % 1 1 1 ShinShin Co., Ltd 339 1.12 % 17 17 17 Sung Kwang Co., Ltd. 23 0.37 % 6 6 6 Shinheung petrol. Co., Ltd. 699 0.14 % 35 35 35 Force TEC Co., Ltd. 3,501 0.02 % 18 18 18 Samsung Tech Co., Ltd. 486 1.28 % 97 36 36 Tae Hyung Co., Ltd. 28 0.43 % 20 20 20 Younil Metal Co., Ltd. 41 0.21 % 21 21 21 Hankook Precision Ind Co., Ltd. 110 0.06 % 11 3 3 Borneo International Furniture Co., Ltd. 4,000 0.16 % 97 13 13 CJ Paradise Co.,Ltd 24 0.02 % 12 12 12 Han Young Technology Company Co.,Ltd. 35 0.00 % — — — STX Offshore & Shipbuilding Co., Ltd 8,622 0.25 % 1,078 1,078 1,078 Ptotronics Co., Ltd. 843 0.42 % 84 6 6 NFT Co., Ltd. 136 0.40 % 8 8 8 Echoroba Co.,Ltd. 157 0.02 % 3 3 3 Hyundaitech Co.,Ltd. 1,363 0.87 % 27 27 27 Dasan Material Co., Ltd. 29 0.04 % 22 22 22 Fish World Co.,Ltd. 47 0.21 % 2 2 2 SG Shinsung Engineering and Construction Co., Ltd. 10 0.00 % 6 6 6 Samdo Industry Electric Co.,Ltd. 48 0.02 % 1 1 1 Taejung Industries Co.,Ltd. 9,268 0.30 % 5 5 5 Shinsei Trading Co., Ltd. 64 0.72 % 6 6 6 Dynamic Co., Ltd. 111 0.19 % 3 3 3 Green Alchemy Co.,Ltd. 38,202 1.48 % 191 17 17 Youone TBM Engineering & Construction Co., Ltd. 615 0.27 % 31 31 31 KM Leatech Co., Ltd. 1,648 0.98 % 8 8 8 Semist Co.,Ltd. 555 0.80 % 3 3 3 Sewon Bus Co.,Ltd 12 0.00 % — — — Enertec Co., Ltd. 7,937 0.19 % 44 44 44 Sangji Co., Ltd. 20 0.26 % 4 4 4 Bellie Doughnuts Co., Ltd. 64 0.07 % 4 4 4 Possbell Engineering Co., Ltd. 36 0.64 % 1 1 1 AIRTECH Information communication Co., Ltd 2,379 0.60 % 12 12 12 Shin kwang Industrial Co., Ltd. 884 0.35 % 55 55 55 Kiscom Co., Ltd. 1,493 0.04 % 1 1 1 Wonil laser Co., Ltd 157 0.37 % 16 16 16 2019 Shares Ownership Acquisition Book value Fair value In millions of won Pyung Hwa Industrial Co.,Ltd. 3,388 3.00 % ￦ 85 85 85 PT. Kedap Saayq 671 10.00 % 18,540 — — Set Holding(*2) 1,100,220 2.50 % 229,255 166,863 166,863 PT. Cirebon Energi Prasarana 22,420 10.00 % 2,612 2,596 2,596 Choheung Packing Co., Ltd. 61 0.13 % 12 12 12 Jaewoo Co., Ltd. 359 0.24 % 11 11 11 Wooyang HC Co., Ltd 1,375 0.01 % 159 159 159 Sungsan Parts Co., Ltd. 629 0.80 % 63 63 63 KMT Co., Ltd. 1,411 0.93 % 21 21 21 TheYeonriji Co., Ltd. 116 0.10 % 6 6 6 Flusys Co., Ltd. 9 0.08 % 2 2 2 DongSeo Electronics Co., Ltd. 323 0.07 % 16 16 16 Daewoo Display Co., Ltd. 177 0.03 % 5 5 5 Yeong-gwang Remicon Co., Ltd. 15 0.12 % 2 2 2 NTS Co., Ltd. 143 0.22 % 36 36 36 AID Co., Ltd. 1,212 0.57 % 36 36 36 Changwon Eco-friendly 3 0.01 % — — — Kumo Hitech Co., Ltd. 6,697 0.53 % 100 100 100 Kyung Pyo Industry Co., Ltd. 186 0.76 % 19 19 19 Daedong Industry Co., Ltd. 617 0.55 % 46 46 46 Doosung Heavy Industries Co., Ltd. 53 0.06 % 5 5 5 Samjoo Hightech Co., Ltd. 522 0.08 % 3 3 3 Samkwang Chemical Co., Ltd. 204 1.27 % 51 51 51 SG Corp. 213 0.54 % 21 21 21 Shinseung Chemical Industy Co., Ltd. 5 0.01 % 60 60 60 KJ Alloy Co., Ltd. 368 0.20 % 7 7 7 SM Hi-tech 22 0.39 % 22 22 22 Keum Mun Industry Co., Ltd. 1,320 0.97 % 330 56 56 Puruen Environment Co., Ltd. 967 1.34 % 19 19 19 Miretech Co., Ltd. 9,111 0.27 % 18 18 18 SIE Co., Ltd. 12 0.02 % 1 1 1 Sejin Hightech Co., Ltd. 17,980 0.16 % 18 18 18 Namcheong Corp. 7,096 0.28 % 284 11 11 Eun Sung Enterprise Co. 1,131 0.72 % 17 17 17 Dongdo Basalt Industry Co., Ltd. 182 1.50 % 73 73 73 Shinyoung Textiles Co., Ltd. 523 1.01 % 52 23 23 Bugook Cast Iron Co. 135 0.71 % 14 14 14 Ilwoo Steel Co., Ltd. 41 0.28 % 17 17 17 Dong-un 1,159 6.28 % 81 81 81 Wongwang Door Corp. 575 1.00 % 29 29 29 Seobu Highway Solar Co., Ltd. 19,460 10.00 % 192 192 192 Dongbu Highway Solar Co., Ltd. 19,020 4.99 % 192 192 192 Muan sunshine solar power plant 298,300 19.00 % 1,492 1,492 1,492 2019 Shares Ownership Acquisition Book value Fair value In millions of won Mansu Co.,Ltd. 344 0.25 % ￦ 15 15 15 Eanskorea Co., Ltd. 39 0.05 % 2 2 2 Youngdongseafood Co., Ltd. 165 0.33 % 8 8 8 Hyunwoo Winstar Co., Ltd. 1 0.00 % — — — Sehwa Diecasting Co., Ltd. 299 1.66 % 44 44 44 Sungchang Tech Co., Ltd. 159 0.31 % 10 10 10 Yuchang Industry Co., Ltd. 90 0.11 % 5 5 5 Jeongpum Co., Ltd. 322 0.35 % 16 16 16 Korea Steel Power Co., Ltd. 2,761 1.88 % 55 55 55 DMC Co., Ltd. 5,831 0.02 % 38 38 38 Amanex Co., Ltd. 10 0.02 % 9 9 9 Dae-A Leisure Co., Ltd. 23 0.00 % 4 4 4 Caffe Bene Co.,Ltd. 1,908 0.03 % 2 2 2 Daechang HRSG Co.,Ltd. 618 0.12 % 62 62 62 Shinjin International Corp. 4 0.01 % 1 1 1 Daewoon Shell Tech Co., Ltd. 666 2.81 % 33 33 33 Jinhung Packaging Co.,Ltd 4,329 3.02 % 9 22 22 Donglim Eng Co., Ltd. 26 0.11 % 3 3 3 SIP Co., Ltd. 274 0.55 % 7 7 7 Clizen Co., Ltd. 615 0.34 % 31 31 31 DAEDONGMILLENNIUM Co., Ltd. 159 0.42 % 32 32 32 Daeji Product Co., Ltd. 15 0.05 % 1 — — Cheong Hae Myeong Ga Co.,Ltd 1,867 0.11 % 5 5 5 Shinhan Sangi Co., Ltd. 29 0.20 % 4 4 4 Jaein Circuit Co., Ltd. 498 1.12 % 65 65 65 SSET Co., Ltd. 181 0.30 % 18 18 18 Sewon PM Tech Co., Ltd. 963 1.11 % 48 48 48 Dawon Yuhwa Co., Ltd. 506 1.94 % 25 25 25 Ogokbaekkwa Co., Ltd. 101 0.12 % 1 1 1 Shinwonn Toptech Co., Ltd. 834 0.51 % 83 83 83 KMLC Co., Ltd. 281 0.14 % 22 22 22 Seinfood Co., Ltd. 13 0.17 % 7 7 7 TaeSung Eco-Tech. Co., Ltd. 1,368 4.55 % 34 34 34 Kukex Inc. 639 0.05 % 3 3 3 Youngshin Plu Co., Ltd. 104 0.12 % 5 5 5 Chang won Engineering Co., Ltd. 22 0.00 % 4 4 4 Samsung Silup Co., Ltd. 47 0.19 % 5 5 5 Samwon Bio Tech Co., Ltd. 390 0.25 % 6 6 6 IZU KOREA Co. Ltd. 48 0.00 % 2 2 2 Dongdo CNP Co., Ltd. 234 0.36 % 6 6 6 Hando Precision Co.,Ltd 38 0.26 % 4 4 4 Dae Bang Industry Co.,Ltd. 115 0.13 % 6 6 6 S.I.T. Co.,Ltd 2,213 0.44 % 22 22 22 2019 Shares Ownership Acquisition Book value Fair value In millions of won Taejin Hiech Co., Ltd. 78 0.26 % ￦ 3 3 3 Headone Co.,Ltd. 69 0.12 % 7 7 7 Enaindustry Co., Ltd. 201 0.09 % 141 141 141 TCT Co., Ltd. 3,277 0.55 % 82 82 82 E-Won Solutech Co., Ltd. 158 0.16 % 40 40 40 MJT Co., Ltd. 1,013 0.20 % 51 51 51 KPL Circuit Co., Ltd. 283 0.08 % 14 14 14 Road Solar Co., Ltd. 12 0.00 % — — — Sung Ae Co., Ltd. 190 0.80 % 10 10 10 Han Mi Flexible Co.,Ltd. 143 0.20 % 43 43 43 Samhwa Casting Co. Ltd. 200 0.00 % 100 100 100 Millennium PNT Co., Ltd. 227 0.37 % 6 6 6 GN Chem Co., Ltd. 40 0.07 % 1 1 1 GW Industry Co., Ltd. 505 0.07 % 51 51 51 TM Construction co. Ltd 4 0.00 % — — — Dae Myung Co., Ltd 114 0.08 % 3 3 3 Nanomicart Co., Ltd. 176 1.06 % 35 35 35 Young San Heavy Industries Co., Ltd. 74 0.11 % 7 7 7 Samchungwon Co., Ltd. 15 0.24 % 2 2 2 Wooyang Frozen Foods Co., Ltd. 66 0.82 % 27 27 27 Nanomic Co., Ltd. 94 0.63 % 38 38 38 Dong Hwan Co., Ltd. 25 0.02 % 1 1 1 266,717 177,968 177,968 ￦ 626,056 379,170 379,170 (*1) The Company used initial cost as their fair value because there was not enough information to determine fair value, and the range of the estimated fair value is wide. (*2) The Company has estimated the fair value of Set Holding by using the discounted cash flow method and has recognized the difference between its fair value and book value as gain or loss on valuation of financial assets at FVOCI in other comprehensive income or loss for the year ended December 31, 2019.

Financial Assets at Amortized_2

Financial Assets at Amortized Cost (Tables)	12 Months Ended
	Dec. 31, 2019
Financial Assets at Amortized Cost [Abstract]
Financial Assets at Amortized Cost	Financial assets at amortized cost as of December 31, 2018 and 2019 are as follows: 2018 Financial assets at amortized cost Government grants Allowance for doubtful accounts Others Book value In millions of won Government bonds ￦ 3,042 — — — 3,042 Others 11,000 — — — 11,000 ￦ 14,042 — — — 14,042 Current ￦ 11,956 — — — 11,956 Non-current 2,086 — — — 2,086 2019 Financial assets at amortized cost Government grants Allowance for doubtful accounts Others Book value In millions of won Government bonds ￦ 1,609 — — — 1,609 Others 12,000 — — — 12,000 ￦ 13,609 — — — 13,609 Current ￦ 12,302 — — — 12,302 Non-current 1,307 — — — 1,307

Derivatives (Tables)

Derivatives (Tables)	12 Months Ended
	Dec. 31, 2019
Derivatives [Abstract]
Derivatives	2018 2019 Current Non-current Current Non-current In millions of won Derivative assets Currency forward ￦ 2,128 12,606 21 43,931 Currency swap 39,979 43,436 27,597 229,258 Interest rate swap — 2,342 — 7,592 Others(*1) — 1,844 — 2,634 ￦ 42,107 60,228 27,618 283,415 Derivative liabilities Currency forward ￦ 1,956 — 7,081 — Currency swap 14,881 233,690 59,327 45,184 Interest rate swap 1,439 58,042 451 50,756 Others(*2,3) 2,155 — 6,205 956 ￦ 20,431 291,732 73,064 96,896 (*1) The Company had a put option to sell shares of DS POWER Co., Ltd. and the fair value of the option is recorded in ‘Others’ in the prior year. The Company sold their shares during the year ended December 31, 2019. As described in Note 16, the Company has a right to purchase the shares of KOSPO Youngnam Power Co., Ltd., a subsidiary of the Company, and the amount is the fair value of the stock option. (*2) The Company has an obligation to settle the convertible preferred stock to financial investors pursuant to the settlement contract with Samcheok Eco Materials Co., Ltd., and the fair value of the obligation is recorded in ‘Others’. (*3) The Company has granted stock option to Chester Solar IV SpA, a joint venture of the Company, and 4 other third party investors and recognized its fair value as other derivative liabilities.
Currency forward contracts which are not designated as hedge instruments	Currency forward contracts which are not designated as hedging instruments as of December 31, 2019 are as follows: Contract date Maturity date Contract amounts Contract exchange rate (in won) Counterparty Pay Receive In millions of won and thousands of foreign currencies except contract exchange rate Hana Bank 2014.04.10 2021.07.12 ￦ 55,120 USD 52,000 ￦ 1,060.00 Hana Bank 2014.04.28 2021.07.12 50,784 USD 48,000 1,058.00 Bank of America 2014.04.29 2021.07.12 105,400 USD 100,000 1,054.00 Hana Bank 2014.05.09 2021.07.12 104,600 USD 100,000 1,046.00 Hana Bank 2017.12.22 2021.07.12 105,079 USD 100,000 1,050.79 Korea Development Bank 2017.12.27 2021.07.12 104,849 USD 100,000 1,048.49 Citibank 2019.12.30 2020.01.23 12,943 USD 11,167 1,159.10 Standard Chartered 2019.12.17 2020.01.02 73,871 EUR 56,800 1,300.57 Nonghyup Bank 2019.12.02 2020.01.03 9,436 USD 8,000 1,179.55 Mizuho Bank 2019.12.03 2020.01.06 9,482 USD 8,000 1,185.25 Hana Bank 2019.12.04 2020.01.07 8,350 USD 7,000 1,192.82 Kookmin Bank 2019.12.05 2020.01.09 11,895 USD 10,000 1,189.45 CCB 2019.12.05 2020.01.09 11,895 USD 10,000 1,189.50 Standard Chartered 2019.12.06 2020.01.10 11,891 USD 10,000 1,189.05 Credit Agricole 2019.12.09 2020.01.13 11,885 USD 10,000 1,188.47 Hana Bank 2019.12.10 2020.01.14 11,912 USD 10,000 1,191.23 Korea Development Bank 2019.12.11 2020.01.15 11,925 USD 10,000 1,192.50 Nonghyup Bank 2019.12.11 2020.01.15 5,962 USD 5,000 1,192.45 Mizuho Bank 2019.12.11 2020.01.15 5,963 USD 5,000 1,192.50 CCB 2019.12.12 2020.01.16 7,118 USD 6,000 1,186.35 Morgan Stanley 2019.12.16 2020.01.17 5,854 USD 5,000 1,170.85 Woori Bank 2019.12.19 2020.01.22 11,636 USD 10,000 1,163.55 Shinhan Bank 2019.12.19 2020.01.22 11,635 USD 10,000 1,163.45 CCB 2019.12.27 2020.01.31 11,597 USD 10,000 1,159.65 Kookmin Bank 2019.12.30 2020.02.03 5,786 USD 5,000 1,157.20 Shinhan Bank 2019.12.18 2020.01.07 9,901 USD 8,500 1,164.86 Hana Bank 2019.12.13 2020.01.07 4,678 USD 4,000 1,169.45 Hana Bank 2019.12.20 2020.01.07 8,136 USD 7,000 1,162.23 BNP Paribas 2019.12.27 2020.01.13 3,480 USD 3,000 1,160.10 Societe Generale 2019.12.27 2020.01.13 8,701 USD 7,500 1,160.10 Korea Development Bank 2019.12.30 2020.01.23 4,630 USD 4,000 1,157.40 BNP Paribas 2019.12.12 2020.01.16 ￦ 4,739 USD 4,000 ￦ 1,184.85 Mizuho Bank 2019.12.12 2020.01.16 3,558 USD 3,000 1,186.00 MUFG 2019.12.17 2020.01.21 5,823 USD 5,000 1,164.60 Nova Scotia 2019.12.17 2020.01.21 5,824 USD 5,000 1,164.70 BNP Paribas 2019.12.20 2020.01.22 2,290 USD 1,975 1,159.48 Nonghyup Bank 2019.12.20 2020.01.22 11,605 USD 10,000 1,160.50 Nova Scotia 2019.12.30 2020.02.03 5,778 USD 5,000 1,155.65 Mizuho Bank 2019.12.30 2020.02.03 5,777 USD 5,000 1,155.30 HSBC 2019.12.13 2020.09.10 46,580 USD 40,000 1,164.50 Nova Scotia 2019.12.13 2020.09.10 34,959 USD 30,000 1,165.30 Nova Scotia 2019.12.16 2020.12.03 11,657 USD 10,000 1,165.70 Nonghyup Bank 2019.12.16 2020.12.03 23,324 USD 20,000 1,166.20 Mizuho Bank 2019.12.17 2020.01.10 10,537 USD 9,000 1,170.80 Mizuho Bank 2019.12.19 2020.01.13 9,314 USD 8,000 1,164.30 Mizuho Bank 2019.12.24 2020.01.04 5,228 USD 4,500 1,161.85 HSBC 2019.12.26 2020.01.23 10,443 USD 9,000 1,160.30 Mizuho Bank 2019.12.30 2020.01.23 4,624 USD 4,000 1,155.90 Standard Chartered 2019.12.03 2020.01.06 315 USD 266 1,186.05 Nova Scotia 2019.12.06 2020.01.10 4,393 USD 3,700 1,187.35 Credit Agricole 2019.12.06 2020.01.10 4,761 USD 4,000 1,190.35 Nova Scotia 2019.12.10 2020.01.13 1,491 USD 1,250 1,192.70 Standard Chartered 2019.12.12 2020.01.16 8,303 USD 7,000 1,186.10 Credit Agricole 2019.12.12 2020.01.16 5,930 USD 5,000 1,185.95 Societe Generale 2019.12.12 2020.01.16 5,931 USD 5,000 1,186.20 Nova Scotia 2019.12.12 2020.01.16 6,525 USD 5,500 1,186.30 Standard Chartered 2019.12.16 2020.01.21 9,367 USD 8,000 1,170.90 Nova Scotia 2019.12.17 2020.01.21 4,648 USD 4,000 1,162.00 Hana Bank 2019.12.19 2020.01.23 6,055 USD 5,200 1,164.40 Woori Bank 2019.12.20 2020.01.28 9,414 USD 8,100 1,162.20 Shinhan Bank 2019.12.20 2020.01.28 4,939 USD 4,250 1,162.15 Shinhan Bank 2019.12.20 2020.01.28 5,806 USD 5,000 1,161.25 Shinhan Bank 2019.12.26 2020.01.30 7,539 USD 6,500 1,159.85 Woori Bank 2019.12.26 2020.01.30 4,060 USD 3,500 1,159.90 Shinhan Bank 2019.12.30 2020.02.03 4,049 USD 3,500 1,156.80 Hana Bank 2019.07.31 2020.07.14 4,993 USD 4,257 1,173.00
Currency swap contracts which are not designated as hedge instruments	Currency swap contracts which are not designated as hedging instruments as of December 31, 2019 are as follows: Counterparty Contract year Contract amount Contract interest rate Contract (in won, Pay Receive Pay Receive In millions of won and thousands of foreign currencies except contract exchange rate information Standard Chartered 2014~2029 ￦ 102,470 USD 100,000 3.14% 3.57% ￦ 1,024.70 Societe Generale 2014~2024 105,017 USD 100,000 4.92% 5.13% 1,050.17 Hana Bank 2015~2024 107,970 USD 100,000 4.75% 5.13% 1,079.70 Credit Agricole 2015~2024 94,219 USD 86,920 4.85% 5.13% 1,083.97 Woori Bank 2019~2027 21,708 USD 19,417 5.04% 6.75% 1,118.00 Woori Bank 2019~2024 296,000 USD 250,000 1.21% 2.50% 1,184.00 Korea Development Bank 2019~2024 177,600 USD 150,000 1.24% 2.50% 1,184.00 Hana Bank 2019~2024 118,400 USD 100,000 1.24% 2.50% 1,184.00 Citibank 2012~2022 112,930 USD 100,000 2.79% 3.00% 1,129.30 JP Morgan 2012~2022 112,930 USD 100,000 2.79% 3.00% 1,129.30 Bank of America 2012~2022 112,930 USD 100,000 2.79% 3.00% 1,129.30 Shinhan Bank 2016~2022 112,930 USD 100,000 2.79% 3.00% 1,129.30 HSBC 2012~2022 111,770 USD 100,000 2.89% 3.00% 1,117.70 Hana Bank 2012~2022 111,770 USD 100,000 2.87% 3.00% 1,117.70 Standard Chartered 2012~2022 111,770 USD 100,000 2.89% 3.00% 1,117.70 Deutsche Bank 2012~2022 55,885 USD 50,000 2.79% 3.00% 1,117.70 Nomura 2015~2025 111,190 USD 100,000 2.60% 3.25% 1,111.90 Korea Development Bank 2015~2025 111,190 USD 100,000 2.62% 3.25% 1,111.90 Woori Bank 2015~2025 55,595 USD 50,000 2.62% 3.25% 1,111.90 Hana Bank 2015~2025 55,595 USD 50,000 2.62% 3.25% 1,111.90 Woori Bank 2017~2027 111,610 USD 100,000 2.25% 3.13% 1,116.10 Korea Development Bank 2017~2027 111,610 USD 100,000 2.31% 3.13% 1,116.10 Hana Bank 2017~2027 111,610 USD 100,000 2.31% 3.13% 1,116.10 Korea Development Bank 2018~2028 108,600 HKD 800,000 2.69% 3.35% 135.75 Shinhan Bank 2018~2028 115,388 HKD 850,000 2.66% 3.35% 135.75 Korea Development Bank 2018~2023 170,280 USD 150,000 2.15% 3.75% 1,135.20 Woori Bank 2018~2023 170,280 USD 150,000 2.18% 3.75% 1,135.20 Hana Bank 2018~2023 113,520 USD 100,000 2.17% 3.75% 1,135.20 Shinhan Bank 2018~2023 227,040 USD 200,000 2.17% 3.75% 1,135.20 Citibank 2019~2024 239,956 CHF 200,000 1.44% 0.00% 1,199.78 Korea Development Bank 2019~2027 119,978 CHF 100,000 1.43% 0.05% 1,199.78 HSBC 2019~2024 USD 205,500 AUD 300,000 3M Libor+0.78% 3M BBSW+0.97% 0.69
Currency swap contracts which are designated as hedge instruments	Currency swap contracts which are designated as hedging instruments as of December 31, 2019 are as follows: Counterparty Contract Contract amount Contract interest rate Contract (in won, Pay Receive Pay Receive In millions of won and thousands of foreign currencies except contract exchange rate information HSBC 2014~2020 ￦ 99,901 AUD 100,000 3.52% 5.75% ￦ 999.01 HSBC 2014~2020 100,482 AUD 100,000 3.48% 5.75% 1,004.82 Standard Chartered 2013~2020 USD 117,250 AUD 125,000 3M Libor + 1.25% 5.75% 0.94 Standard Chartered 2014~2020 126,032 USD 117,250 3.55% 3M Libor + 1.25% 1,074.90 Korea Development Bank 2017~2020 114,580 USD 100,000 1.75% 2.38% 1,145.80 Hana Bank 2017~2020 114,580 USD 100,000 1.75% 2.38% 1,145.80 Export-import bank of Korea 2017~2020 114,580 USD 100,000 1.75% 2.38% 1,145.80 Korea Development Bank 2016~2021 121,000 USD 100,000 2.15% 2.50% 1,210.00 Morgan Stanley 2016~2021 121,000 USD 100,000 3M Libor + 2.10% 2.50% 1,210.00 BNP Paribas 2016~2021 121,000 USD 100,000 3M Libor + 2.10% 2.50% 1,210.00 Nomura 2017~2037 52,457 EUR 40,000 2.60% 1.70% 1,311.42 Nomura 2017~2037 59,423 SEK 450,000 2.62% 2.36% 132.05 Korea Development Bank 2019~2022 112,650 USD 100,000 1.80% 3.38% 1,126.50 Kookmin Bank 2019~2022 112,650 USD 100,000 1.80% 3.38% 1,126.50 Woori Bank 2019~2022 112,650 USD 100,000 1.80% 3.38% 1,126.50 Korea Development Bank 2018~2023 320,880 USD 300,000 2.03% 3.75% 1,069.60 BNP Paribas 2019~2024 111,841 CHF 100,000 1.78% 0.13% 1,118.41 Kookmin Bank 2019~2024 111,841 CHF 100,000 1.78% 0.13% 1,118.41 Korea Development Bank 2019~2022 117,340 USD 100,000 1.06% 2.38% 1,173.40 Hana Bank 2019~2022 117,340 USD 100,000 1.06% 2.38% 1,173.40 Kookmin Bank 2019~2022 117,340 USD 100,000 1.06% 2.38% 1,173.40 Hana Bank 2018~2021 212,960 USD 200,000 2.10% 3.00% 1,064.80 Korea Development Bank 2018~2021 212,960 USD 200,000 2.10% 3.00% 1,064.80 Credit Agricole 2014~2020 110,680 USD 100,000 2.29% 2.50% 1,106.80 Societe Generale 2014~2020 55,340 USD 50,000 2.16% 2.50% 1,106.80 Hana Bank 2014~2020 55,340 USD 50,000 2.16% 2.50% 1,106.80 Hana Bank 2014~2020 55,340 USD 50,000 2.21% 2.50% 1,106.80 Standard Chartered 2014~2020 55,340 USD 50,000 2.21% 2.50% 1,106.80 HSBC 2014~2020 55,340 USD 50,000 2.21% 2.50% 1,106.80 Nomura 2014~2020 55,340 USD 50,000 2.21% 2.50% 1,106.80 BNP Paribas 2014~2020 55,340 USD 50,000 2.21% 2.50% 1,106.80 HSBC 2014~2020 55,340 USD 50,000 2.21% 2.50% 1,106.80 Hana Bank 2017~2022 226,600 USD 200,000 1.94% 2.63% 1,133.00 Korea Development Bank 2017~2022 113,300 USD 100,000 1.94% 2.63% 1,133.00 Nomura 2017~2022 113,300 USD 100,000 1.95% 2.63% 1,133.00 Woori Bank 2017~2022 56,650 USD 50,000 1.95% 2.63% 1,133.00 Kookmin Bank 2017~2022 56,650 USD 50,000 1.95% 2.63% 1,133.00 Korea Development Bank 2018~2023 ￦ 169,335 USD 150,000 2.26% 3.88% ￦ 1,128.90 Woori Bank 2018~2023 169,335 USD 150,000 2.26% 3.88% 1,128.90 Credit Agricole 2018~2023 112,890 USD 100,000 2.26% 3.88% 1,128.90 Hana Bank 2018~2023 56,445 USD 50,000 2.26% 3.88% 1,128.90 Kookmin Bank 2018~2023 56,445 USD 50,000 2.26% 3.88% 1,128.90
Interest rate swap contracts which are not designated as hedge instruments	Interest rate swap contracts which are not designated as hedging instruments as of December 31, 2019 are as follows: Counterparty Contract Contract amount Contract interest rate per annum Pay Receive In millions of Hana Bank 2017~2022 ￦ 100,000 2.01% 3M CD + 0.24% Hana Bank 2017~2022 100,000 2.06% 3M CD + 0.27% Nomura(*1) 2017~2037 30,000 2.05% 3.08% Hana Bank 2017~2021 200,000 2.45% 3M CD + 0.32% Nomura(*2) 2018~2038 30,000 2.56% 3.75% Hana Bank 2018~2023 200,000 2.15% 3M CD + 0.19% Hana Bank 2018~2023 200,000 2.17% 3M CD + 0.19% Hana Bank 2018~2023 150,000 2.03% 3M CD + 0.21% Hana Bank 2019~2024 200,000 1.87% 3M CD + 0.13% Societe Generale 2017~2022 200,000 3M Libor + 3.44% 3.77% Nomura 2017~2027 52,457 3M Libor + 2.25% 2.60% Nomura 2017~2027 59,423 3M Libor + 2.27% 2.62% Export-Import Bank of Korea 2015~2031 USD 15,893 2.67% 6M USD Libor ING Bank 2015~2031 USD 7,861 2.67% 6M USD Libor BNP Paribas 2015~2031 USD 7,861 2.67% 6M USD Libor (*1) 2.05% of the contract paying interest rate is applied for five years from the date of issuance, and 3M CD + 0.10% is applied thereafter. Depending on exercise of counterparty’s right, it can be reimbursed before the due on the same day of every year starting from September 18, 2022. (*2) 2.56% of the contract paying interest rate is applied for five years from the date of issuance, and 3M CD + 0.10% is applied thereafter. Depending on exercise of counterparty’s right, it can be reimbursed before the due on the same day of every year starting from June 15, 2023.
Interest rate swap contracts which are designated as hedge instruments	Interest rate swap contracts which are designated as hedging instruments as of December 31, 2019 are as follows: Counterparty Contract Contract amount Contract interest rate per annum Pay Receive In millions of BNP Paribas 2009~2027 USD 92,120 4.16% 6M USD Libor KFW 2009~2027 USD 92,120 4.16% 6M USD Libor Export-Import Bank of Korea 2016~2036 USD 80,514 3.00% 6M USD Libor
Gain and loss on valuation and transaction of derivatives	Gain and loss on valuation and transaction of derivatives for the years ended December 31, 2017, 2018 and 2019 are as follows and included in finance income and expenses in the consolidated statements of comprehensive income (loss): Net income effects of Net income effects of Other comprehensive 2017 2018 2019 2017 2018 2019 2017 2018 2019 In millions of won Currency forward ￦ (41,889 ) 12,632 24,265 (28,223 ) 23,991 12,488 — — — Currency swap (843,747 ) 145,088 310,732 (137,376 ) 123,670 110,813 26,810 (12,516 ) 38,802 Interest rate swap 6,909 (2,949 ) (16,231 ) (3,362 ) (364 ) (36,886 ) 5,074 6,087 (3,075 ) Other derivatives 4,060 (1,568 ) (1,416 ) — — — — — — ￦ (874,667 ) 153,203 317,350 (168,961 ) 147,297 86,415 31,884 (6,429 ) 35,727 (*) For the year ended December 31, 2019, the net gain on valuation of derivatives designated as cash flow hedge of ￦19,242 million, net of tax, is included in other comprehensive income or loss.

Other Financial Assets (Tables)

Other Financial Assets (Tables)	12 Months Ended
	Dec. 31, 2019
Other Financial Assets [Abstract]
Other Financial Assets	Other financial assets as of December 31, 2018 and 2019 are as follows: 2018 2019 Current Non-current Current Non-current In millions of won Loans and receivables ￦ 123,657 639,673 64,111 725,755 Less: Allowance for doubtful accounts (12 ) (4,940 ) (31 ) (15,063 ) Less: Present value discount (992 ) (38,712 ) (847 ) (35,218 ) Long-term / short-term financial instruments(*) 1,869,286 448,741 1,351,971 608,256 ￦ 1,991,939 1,044,762 1,415,204 1,283,730 (*) From prior year, certain financial assets at fair value previously recognized as other financial assets is reclassified to financial assets at fair value through profit or loss upon the adoption of IFRS 9 ‘Financial Instruments’.
Loans and receivables	Loans and receivables as of December 31, 2018 and 2019 are as follows: 2018 Face value Allowance for Present value Carrying value In millions of won Short-term loans and receivables Loans for tuition ￦ 33,333 — (992 ) 32,341 Loans for housing 15,572 — — 15,572 Fisheries loan 320 — — 320 Other loans 74,432 (12 ) — 74,420 123,657 (12 ) (992 ) 122,653 Long-term loans and receivables Loans for tuition 414,893 — (38,659 ) 376,234 Loans for housing 167,723 — — 167,723 Loans for related parties 46,798 (4,930 ) — 41,868 Fisheries loan 640 — (53 ) 587 Other loans 9,619 (10 ) — 9,609 639,673 (4,940 ) (38,712 ) 596,021 ￦ 763,330 (4,952 ) (39,704 ) 718,674 2019 Face value Allowance for Present value Carrying value In millions of won Short-term loans and receivables Loans for tuition ￦ 33,636 — (847 ) 32,789 Loans for housing 17,113 — — 17,113 Other loans 13,362 (31 ) — 13,331 64,111 (31 ) (847 ) 63,233 Long-term loans and receivables Loans for tuition 419,905 — (35,197 ) 384,708 Loans for housing 199,454 — — 199,454 Loans for related parties 89,132 (4,930 ) — 84,202 Other loans 17,264 (10,133 ) (21 ) 7,110 725,755 (15,063 ) (35,218 ) 675,474 ￦ 789,866 (15,094 ) (36,065 ) 738,707
Changes in the allowance for doubtful accounts of loans and receivables	Changes in the allowance for doubtful accounts of loans for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 2018 2019 In millions of won Beginning balance ￦ 4,532 8,948 4,952 Bad debt expense 2,465 22 10,142 Other 1,951 (4,018 ) — Ending balance ￦ 8,948 4,952 15,094
Long-term and short-term financial instruments	Long-term and short-term financial instruments as of December 31, 2018 and 2019 are as follows: 2018 2019 Current Non-current Current Non-current In millions of won Time deposits ￦ 1,602,285 63,358 1,034,971 257,857 CP — — 40,000 — CD 10,000 — 15,000 — RP — — 40,000 — Others 257,001 385,383 222,000 350,399 ￦ 1,869,286 448,741 1,351,971 608,256

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2019
Inventories [Abstract]
Inventories	Inventories as of December 31, 2018 and 2019 are as follows: 2018 Acquisition cost Valuation allowance Book value In millions of won Raw materials ￦ 3,886,739 (2,609 ) 3,884,130 Work-in-progress 189,907 (1,028 ) 188,879 Finished goods 50,526 — 50,526 Supplies 1,858,751 (3,907 ) 1,854,844 Inventories-in-transit 1,196,113 — 1,196,113 Other inventories 13,761 — 13,761 ￦ 7,195,797 (7,544 ) 7,188,253 2019 Acquisition cost Valuation allowance Book value In millions of won Raw materials ￦ 3,790,443 (1,430 ) 3,789,013 Merchandises 340 — 340 Work-in-progress 165,073 — 165,073 Finished goods 58,280 — 58,280 Supplies 2,121,363 (4,369 ) 2,116,994 Inventories-in-transit 906,267 — 906,267 Other inventories 14,733 — 14,733 ￦ 7,056,499 (5,799 ) 7,050,700 The reversals of the allowance for loss on inventory valuation due to increase in the net realizable value of inventories deducted from cost of sales for the years ended December 31, 2017, 2018 and 2019 were ￦437 million , ￦3,723 million and ￦4,872 million, respectively. The amounts of loss from inventory valuation included in other gains or losses for the years ended December 31, 2017, 2018 and 2019 were ￦3,875 million, ￦1,953 million and ￦3,127 million, respectively.

Non-Financial Assets (Tables)

Non-Financial Assets (Tables)	12 Months Ended
	Dec. 31, 2019
Non-Financial Assets [Abstract]
Non-Financial Assets	Non-financial 2018 2019 Current Non-current Current Non-current In millions of won Advanced payment ￦ 156,073 160,628 147,784 2,694 Prepaid expenses(*1) 290,944 90,449 308,017 84,421 Others(*2) 431,871 76,075 750,576 79,814 ￦ 878,888 327,152 1,206,377 166,929 (*1) Prepaid expenses of ￦4,353 million as of December 31, 2018 was recorded as right-of-assets (*2) Details of others as of December 31, 2018 and 2019 are as follows: 2018 2019 Current Non-current Current Non-current In millions of won Greenhouse gas emissions rights ￦ 93,749 — 437,562 — Other quick assets, etc.(*3) 338,122 76,075 313,014 79,814 ￦ 431,871 76,075 750,576 79,814 (*3) The Company recognized ￦92,128 million of its rights in connection with the securities of Orano Expansion as non-current non-financial

Consolidated Subsidiaries (Tabl

Consolidated Subsidiaries (Tables)	12 Months Ended
	Dec. 31, 2019
Consolidated Subsidiaries [Abstract]
Consolidated Subsidiaries	Consolidated subsidiaries as of December 31, 2018 and 2019 are as follows: Percentage of ownership (%) Subsidiaries Key operation activities Location 2018 2019 Korea Hydro & Nuclear Power Co., Ltd. Power generation KOREA 100.00 % 100.00 % Korea South-East Power Co., Ltd. Power generation KOREA 100.00 % 100.00 % Korea Midland Power Co., Ltd. Power generation KOREA 100.00 % 100.00 % Korea Western Power Co., Ltd. Power generation KOREA 100.00 % 100.00 % Korea Southern Power Co., Ltd. Power generation KOREA 100.00 % 100.00 % Korea East-West Power Co., Ltd. Power generation KOREA 100.00 % 100.00 % KEPCO Engineering & Construction Company, Inc.(*1) Architectural engineering for utility plant and others KOREA 65.77 % 65.77 % KEPCO Plant Service & Engineering Co., Ltd. Utility plant maintenance and others KOREA 51.00 % 51.00 % KEPCO Nuclear Fuel Co., Ltd. Nuclear fuel KOREA 96.36 % 96.36 % KEPCO KDN Co., Ltd. Electric power information technology and others KOREA 100.00 % 100.00 % Garolim Tidal Power Plant Co., Ltd.(*6) Power generation KOREA 49.00 % — KEPCO International HongKong Ltd. Holding company HONG KONG 100.00 % 100.00 % KEPCO International Philippines Inc. Holding company PHILIPPINES 100.00 % 100.00 % KEPCO Gansu International Ltd. Holding company HONG KONG 100.00 % 100.00 % KEPCO Philippines Holdings Inc. Holding company PHILIPPINES 100.00 % 100.00 % KEPCO Philippines Corporation Operation of utility plant PHILIPPINES 100.00 % 100.00 % KEPCO Ilijan Corporation Construction and operation of utility plant PHILIPPINES 51.00 % 51.00 % KEPCO Lebanon SARL Operation of utility plant LEBANON 100.00 % 100.00 % KEPCO Neimenggu International Ltd. Holding company HONG KONG 100.00 % 100.00 % KEPCO Shanxi International Ltd. Holding company HONG KONG 100.00 % 100.00 % KOMIPO Global Pte Ltd. Holding company SINGAPORE 100.00 % 100.00 % KEPCO Netherlands B.V. Holding company NETHERLANDS 100.00 % 100.00 % KOREA Imouraren Uranium Investment Corp. Holding company FRANCE 100.00 % 100.00 % KEPCO Australia Pty., Ltd. Resources development AUSTRALIA 100.00 % 100.00 % KOSEP Australia Pty., Ltd. Resources development AUSTRALIA 100.00 % 100.00 % KOMIPO Australia Pty., Ltd. Resources development AUSTRALIA 100.00 % 100.00 % KOWEPO Australia Pty., Ltd. Resources development AUSTRALIA 100.00 % 100.00 % KOSPO Australia Pty., Ltd. Resources development AUSTRALIA 100.00 % 100.00 % KEPCO Middle East Holding Company Holding company BAHRAIN 100.00 % 100.00 % Qatrana Electric Power Company Construction and operation of utility plant JORDAN 80.00 % 80.00 % KHNP Canada Energy, Ltd. Holding company CANADA 100.00 % 100.00 % KEPCO Bylong Australia Pty., Ltd. Resources development AUSTRALIA 100.00 % 100.00 % Korea Waterbury Uranium Limited Partnership Resources development CANADA 80.00 % 80.00 % Korea Electric Power Nigeria Ltd.(*7) Operation of utility plant NIGERIA 100.00 % — KEPCO Holdings de Mexico Holding company MEXICO 100.00 % 100.00 % KST Electric Power Company Construction and operation of utility plant MEXICO 56.00 % 56.00 % KEPCO Energy Service Company Operation of utility plant MEXICO 100.00 % 100.00 % KEPCO Netherlands S3 B.V. Holding company NETHERLANDS 100.00 % 100.00 % PT. KOMIPO Pembangkitan Jawa Bali Operation of utility plant INDONESIA 51.00 % 51.00 % PT. Cirebon Power Service(*2) Operation of utility plant INDONESIA 27.50 % 27.50 % KOWEPO International Corporation Operation of utility plant PHILIPPINES 99.99 % 99.99 % KOSPO Jordan, LLC Operation of utility plant JORDAN 100.00 % 100.00 % EWP Philippines Corporation Holding company PHILIPPINES 100.00 % 100.00 % EWP America Inc. Holding company USA 100.00 % 100.00 % EWP Renewable Corporation Holding company USA 100.00 % 100.00 % DG Fairhaven Power, LLC Power generation USA 100.00 % 100.00 % DG Whitefield, LLC Power generation USA 100.00 % 100.00 % Springfield Power, LLC Power generation USA 100.00 % 100.00 % KNF Canada Energy Limited Holding company CANADA 100.00 % 100.00 % EWP Barbados 1 SRL Holding company BARBADOS 100.00 % 100.00 % California Power Holdings, LLC Power generation USA 100.00 % 100.00 % Gyeonggi Green Energy Co., Ltd. Power generation KOREA 62.01 % 62.01 % PT. Tanggamus Electric Power Power generation INDONESIA 52.50 % 52.50 % Gyeongju Wind Power Co., Ltd. Power generation KOREA 70.00 % 70.00 % KOMIPO America Inc. Holding company USA 100.00 % 100.00 % EWPRC Biomass Holdings, LLC Holding company USA 100.00 % 100.00 % KOSEP USA, INC. Power generation USA 100.00 % 100.00 % PT. EWP Indonesia Holding company INDONESIA 99.96 % 99.96 % KEPCO Netherlands J3 B.V. Holding company NETHERLANDS 100.00 % 100.00 % Korea Offshore Wind Power Co., Ltd. Power generation KOREA 100.00 % 100.00 % Global One Pioneer B.V. Holding company NETHERLANDS 100.00 % 100.00 % Global Energy Pioneer B.V. Holding company NETHERLANDS 100.00 % 100.00 % Mira Power Limited(*3) Power generation PAKISTAN 76.00 % 76.00 % KOSEP Material Co., Ltd. Recycling fly ashes KOREA 86.22 % 86.22 % Commerce and Industry Energy Co., Ltd.(*4) Power generation KOREA 59.03 % 85.00 % KEPCO Singapore Holdings Pte., Ltd.(*7) Holding company SINGAPORE 100.00 % — KEPCO KPS Philippines Corp. Utility plant maintenance and others PHILIPPINES 99.99 % 99.99 % KOSPO Chile SpA Holding company CHILE 100.00 % 100.00 % PT. KOWEPO Sumsel Operation And Maintenance Services Utility plant maintenance and others INDONESIA 95.00 % 95.00 % HeeMang Sunlight Power Co., Ltd. Operation of utility plant KOREA 100.00 % 100.00 % Fujeij Wind Power Company Operation of utility plant JORDAN 100.00 % 100.00 % KOSPO Youngnam Power Co., Ltd. Operation of utility plant KOREA 50.00 % 50.00 % VI Carbon Professional Private Special Asset Investment Trust 1 Holding company KOREA 96.67 % 96.67 % Chitose Solar Power Plant LLC Power generation JAPAN 80.10 % 80.10 % KEPCO Energy Solution Co. Ltd. Energy service KOREA 100.00 % 100.00 % Solar School Plant Co., Ltd. Power generation KOREA 100.00 % 100.00 % KOSPO Power Services Limitada Utility plant maintenance and others CHILE 65.00 % 65.00 % Energy New Industry Specialized Investment Private Investment Trust Holding company KOREA 99.01 % 99.01 % KOEN Bylong Pty., Ltd. Resources development AUSTRALIA 100.00 % 100.00 % KOMIPO Bylong Pty., Ltd. Resources development AUSTRALIA 100.00 % 100.00 % KOWEPO Bylong Pty., Ltd. Resources development AUSTRALIA 100.00 % 100.00 % KOSPO Bylong Pty., Ltd. Resources development AUSTRALIA 100.00 % 100.00 % EWP Bylong Pty., Ltd. Resources development AUSTRALIA 100.00 % 100.00 % KOWEPO Lao International Utility plant maintenance and others LAOS 100.00 % 100.00 % KEPCO US Inc. Holding company USA 100.00 % 100.00 % KEPCO Alamosa LLC Holding company USA 50.10 % 50.10 % KEPCO Solar of Alamosa, LLC (formerly, Cogentrix of Alamosa, LLC) Power generation USA 100.00 % 100.00 % KEPCO-LG Holding company USA 70.00 % 70.00 % Mangilao Investment LLC Holding company USA 100.00 % 100.00 % KEPCO-LG Power generation USA 100.00 % 100.00 % Jeju Hanlim Offshore Wind Co., Ltd. Power generation KOREA 75.99 % 75.99 % PT. Siborpa Eco Power Construction and operation of utility plant INDONESIA 55.00 % 55.00 % BSK E-New Holding company KOREA 81.67 % 81.67 % e-New Holding company KOREA 76.11 % 76.11 % Songhyun e-New Holding company KOREA 80.65 % 80.65 % PT. Korea Energy Indonesia Utility plant maintenance and others INDONESIA 95.00 % 95.00 % KOLAT SpA Utility plant maintenance and others CHILE 100.00 % 100.00 % KEPCO California, LLC Holding company USA 100.00 % 100.00 % KEPCO Mojave Holdings, LLC Holding company USA 100.00 % 100.00 % Incheon Fuel Cell Co., Ltd. Power generation KOREA 60.00 % 60.00 % KOEN Service Co., Ltd. Facility maintenance and service KOREA 100.00 % 100.00 % KOMIPO Service Co., Ltd. Facility maintenance and service KOREA 100.00 % 100.00 % KOWEPO Service Co., Ltd. Facility maintenance and service KOREA 100.00 % 100.00 % KOSPO Service Co., Ltd. Facility maintenance and service KOREA 100.00 % 100.00 % EWP Service Co., Ltd. Facility maintenance and service KOREA 100.00 % 100.00 % PT. KOMIPO Energy Indonesia Utility plant maintenance and others INDONESIA 95.00 % 95.00 % KNF Partners Co., Ltd. Facility maintenance KOREA — 100.00 % KOSPO USA Inc. Holding company USA — 100.00 % Nambu USA LLC Holding company USA — 100.00 % Tamra Offshore Wind Power Co., Ltd.(*5) Power generation KOREA — 63.00 % KEPCO MCS Co., Ltd. Electric meter reading and others KOREA — 100.00 % KEPCO FMS Co., Ltd. Security service and others KOREA — 100.00 % Firstkeepers Co., Ltd. Facility maintenance KOREA — 100.00 % Secutec Co., Ltd. Security service KOREA — 100.00 % SE Green Energy Co., Ltd.(*5) Power generation KOREA — 84.80 % KEPCO Mangilao America LLC Holding company USA — 100.00 % Mangilao Intermediate Holdings LLC Holding company USA — 100.00 % KEPCO CSC Co., Ltd. Facility maintenance KOREA — 100.00 % KOAK Power Limited Facility maintenance PAKISTAN — 100.00 % KOMIPO Europe B.V. Holding company SWEDEN — 100.00 % Haenanum Energy Fund Holding company KOREA — 99.64 % Paju Ecoenergy Co., Ltd. Power generation KOREA — 89.00 % (*1) Considering treasury stocks, the effective percentage of ownership is 66.08%. (*2) The effective percentage of ownership is less than 50%. However, this subsidiary is included in the consolidated financial statements as the Company obtained the majority of the voting power through the shareholders’ agreement. (*3) As of the reporting date, the annual reporting period of all subsidiaries is December 31, except for Mira Power Limited which is November 30. (*4) The Company guarantees a certain return on investment related to Commerce and Industry Energy Co., Ltd. for the financial investors. The financial investors have a right to sell their shares to the Company which can be exercised 84 months after the date of investment. Accordingly, the purchase price including the return on investment is classified as a liability. (*5) The entity was reclassified from an associate to a subsidiary due to additional acquisition of interest during the year ended December 31, 2019. (*6) The liquidation process is in progress by the appointment of a liquidator, and the Company has been reclassified the invested amount as assets held for sale as of December 31, 2019. (*7) The liquidation process has been completed during the year ended December 31, 2019. (*8) The Company does not hold a stake, but it is included in subsidiaries because the Company has control over KEPCO-LG
Subsidiaries newly included in or excluded from consolidation	Subsidiaries newly included in or excluded from consolidation for the year ended December 31, 2019 are as follows: Subsidiaries included in consolidation during the year ended December 31, 2019. Subsidiary Reason KNF Partners Co., Ltd. Newly established KOSPO USA Inc. Newly established Nambu USA LLC Newly established Tamra Offshore Wind Power Co., Ltd. Additional acquisition KEPCO MCS Co., Ltd. Newly established KEPCO FMS Co., Ltd. Newly established Firstkeepers Co., Ltd. Newly established Secutec Co., Ltd. Newly established SE Green Energy Co., Ltd. Additional acquisition KEPCO Mangilao America LLC Newly established Mangilao Intermediate Holdings LLC Newly established KEPCO CSC Co., Ltd. Newly established KOAK Power Limited Newly established KOMIPO Europe B.V. Newly established Haenanum Energy Fund Newly established Paju Ecoenergy Co., Ltd. Newly established Subsidiaries excluded from consolidation during the year ended December 31, 2019. Subsidiary Reason KEPCO Singapore Holdings Pte., Ltd. Liquidated Korea Electric Power Nigeria Ltd. Liquidated Garolim Tidal Power Plant Co., Ltd. Under liquidation process
Summary of financial information of consolidated subsidiaries	Summary of financial information of consolidated subsidiaries as of and for the years ended December 31, 2018 and 2019 are as follows: 2018 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the year In millions of won Korea Hydro & Nuclear Power Co., Ltd. ￦ 55,792,704 30,484,104 8,858,717 (137,613 ) Korea South-East Power Co., Ltd. 9,997,758 4,948,553 5,521,038 25,736 Korea Midland Power Co., Ltd. 10,839,218 7,088,013 4,368,467 (38,142 ) Korea Western Power Co., Ltd. 9,902,752 5,965,410 4,841,261 (28,157 ) Korea Southern Power Co., Ltd. 9,810,985 5,463,721 5,539,793 55,439 Korea East-West Power Co., Ltd. 8,744,380 4,092,460 4,933,525 3,345 KEPCO Engineering & Construction Company, Inc. 771,480 310,100 433,701 12,937 KEPCO Plant Service & Engineering Co., Ltd. 1,275,365 296,428 1,239,604 160,791 KEPCO Nuclear Fuel Co., Ltd. 817,416 434,439 230,667 15,835 KEPCO KDN Co., Ltd. 566,807 159,423 622,154 60,016 2018 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the year In millions of won Garolim Tidal Power Plant Co., Ltd. ￦ 608 345 — (11 ) KEPCO International HongKong Ltd. 140,101 1 — 3,307 KEPCO International Philippines Inc. 107,948 1,475 — 52,539 KEPCO Gansu International Ltd. 12,047 515 — (24 ) KEPCO Philippines Holdings Inc. 188,551 9,775 — 53,219 KEPCO Philippines Corporation 6,394 213 — 54 KEPCO Ilijan Corporation 431,444 53,413 99,844 49,631 KEPCO Lebanon SARL 1,509 9,686 — 413 KEPCO Neimenggu International Ltd. 194,336 — — 20,829 KEPCO Shanxi International Ltd. 519,991 201,732 — 290 KOMIPO Global Pte Ltd. 250,456 961 — 11,478 KEPCO Netherlands B.V. 130,460 77 — 26,550 KOREA Imouraren Uranium Investment Corp. 63,517 171 — (89,852 ) KEPCO Australia Pty., Ltd. 439,719 14 — 49 KOSEP Australia Pty., Ltd. 37,057 2,832 20,294 7,315 KOMIPO Australia Pty., Ltd. 39,066 4,659 20,294 7,193 KOWEPO Australia Pty., Ltd. 39,341 4,702 20,294 7,316 KOSPO Australia Pty., Ltd. 36,525 3,585 20,294 9,520 KEPCO Middle East Holding Company 101,201 92,862 — 3,043 Qatrana Electric Power Company 484,383 326,486 18,766 21,170 KHNP Canada Energy, Ltd. 49,776 35 — (26 ) KEPCO Bylong Australia Pty., Ltd. 254,398 315,921 — (29,573 ) Korea Waterbury Uranium Limited Partnership 20,890 142 — (74 ) Korea Electric Power Nigeria Ltd. 112 39 727 (93 ) KEPCO Holdings de Mexico 248 57 — (11 ) KST Electric Power Company 535,807 457,867 109,735 10,274 KEPCO Energy Service Company 1,940 1,454 5,117 (232 ) KEPCO Netherlands S3 B.V. 46,518 38 — 1,226 PT. KOMIPO Pembangkitan Jawa Bali 11,405 5,472 20,320 3,925 PT. Cirebon Power Service 1,588 273 7,228 177 KOWEPO International Corporation — 8 — — KOSPO Jordan LLC 16,315 3,432 34,371 1,907 EWP Philippines Corporation 1,684 829 — (11 ) EWP America Inc.(*1) 72,525 4,903 29,557 (4,483 ) KNF Canada Energy Limited 1,801 20 — (45 ) EWP Barbados 1 SRL 268,033 1,581 688 11,221 Gyeonggi Green Energy Co., Ltd. 293,812 185,043 96,442 25,121 PT. Tanggamus Electric Power 216,321 187,502 26,832 9,338 Gyeongju Wind Power Co., Ltd. 122,303 83,348 21,906 8,803 2018 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the year In millions of won KOMIPO America Inc. ￦ 10,092 572 — (885 ) KOSEP USA, Inc. 1 4,857 — 4,341 PT. EWP Indonesia 7,444 14 — 3,138 KEPCO Netherlands J3 B.V. 115,978 77 — (104 ) Korea Offshore Wind Power Co., Ltd. 216,114 36,377 — (8,473 ) Global One Pioneer B.V. 162 87 — (113 ) Global Energy Pioneer B.V. 325 74 — (102 ) Mira Power Limited 277,525 213,104 — (980 ) KOSEP Material Co., Ltd. 2,862 1,249 3,240 377 Commerce and Industry Energy Co., Ltd. 92,872 88,009 27,937 (6,091 ) KEPCO Singapore Holdings Pte., Ltd. 582 9 — (31 ) KEPCO KPS Philippines Corp. 7,501 358 4,815 766 KOSPO Chile SpA 139,814 57,502 — 1,016 PT. KOWEPO Sumsel Operation And Maintenance Services 1,313 394 4,343 (654 ) HeeMang Sunlight Power Co., Ltd. 10,915 7,626 146 (192 ) Fujeij Wind Power Company 217,796 212,435 — (1,033 ) KOSPO Youngnam Power Co., Ltd. 413,472 325,589 369,669 8,155 VI Carbon Professional Private Special Asset Investment Trust 1 (formally, HI Carbon Professional Private Special Asset) 3,002 — — 12 Chitose Solar Power Plant LLC 115,505 105,079 15,022 872 KEPCO Energy Solution Co., Ltd. 304,103 849 5,584 2,532 Solar School Plant Co., Ltd. 204,282 1,366 1,149 2,033 KOSPO Power Services Limitada 3,045 596 9,610 1,132 Energy New Industry Specialized Investment Private Investment Trust(*2) 66,498 1,014 — (1,140 ) KOEN Bylong Pty., Ltd. 5,544 26 — (10 ) KOMIPO Bylong Pty., Ltd. 5,544 26 — (25 ) KOWEPO Bylong Pty., Ltd. 5,544 26 — — KOSPO Bylong Pty., Ltd. 5,544 26 — (25 ) EWP Bylong Pty., Ltd. 5,544 16 — (15 ) KOWEPO Lao International 3,800 1,015 2,899 895 KEPCO US Inc. 16,640 — — 6 KEPCO Alamosa LLC 32,346 79 750 (688 ) KEPCO Solar of Alamosa, LLC (formerly, Cogentrix of Alamosa, LLC) 64,223 48,819 9,015 200 KEPCO-LG 25,642 27,197 — (1,144 ) Mangilao Investment LLC 25,641 — — — KEPCO-LG 25,406 146 — (104 ) 2018 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the year In millions of won Jeju Hanlim Offshore Wind Co., Ltd. ￦ 16,557 328 — (925 ) PT. Siborpa Eco Power 12,363 141 — (1,771 ) PT. Korea Energy Indonesia 1,183 60 1,459 223 KOLAT SpA 38,362 474 585 (186 ) KEPCO California, LLC 42,171 21 — (332 ) KEPCO Mojave Holdings, LLC 103,189 65,730 — (3,959 ) Incheon Fuel Cell Co., Ltd. 23,626 415 — (201 ) KOEN Service Co., Ltd. 583 31 — (48 ) KOMIPO Service Co., Ltd. 576 17 — (41 ) KOWEPO Service Co., Ltd. 750 227 — (77 ) KOSPO Service Co., Ltd. 576 6 — (30 ) EWP Service Co., Ltd. 667 97 — (30 ) PT. KOMIPO Energy Indonesia 2,236 — — — (*1) Financial information of EWP America Inc. includes that of six other subsidiaries, EWP Renewable Corporation, DG Fairhaven Power, LLC, DG Whitefield, LLC, Springfield Power, LLC, California Power Holdings, LLC, and EWPRC Biomass Holdings, LLC. (*2) Financial information of Energy New Industry Specialized Investment Private Investment Trust includes that of three other subsidiaries, BSK E-New e-New e-New 2019 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the year In millions of won Korea Hydro & Nuclear Power Co., Ltd. ￦ 59,570,219 33,917,275 8,969,072 306,007 Korea South-East Power Co., Ltd. 10,938,358 5,866,642 5,385,387 41,006 Korea Midland Power Co., Ltd. 12,684,828 8,977,766 4,479,707 (28,449 ) Korea Western Power Co., Ltd. 10,514,438 6,637,451 4,448,992 (46,061 ) Korea Southern Power Co., Ltd. 10,884,799 6,608,301 5,084,907 (41,342 ) Korea East-West Power Co., Ltd. 9,724,311 5,022,921 4,855,964 56,698 KEPCO Engineering & Construction Company, Inc. 735,207 242,994 448,635 26,398 KEPCO Plant Service & Engineering Co., Ltd. 1,356,983 294,757 1,244,613 157,737 KEPCO Nuclear Fuel Co., Ltd. 831,604 429,799 309,055 24,618 KEPCO KDN Co., Ltd. 604,458 159,807 625,567 42,205 KEPCO International HongKong Ltd. 138,942 633 — 3,330 KEPCO International Philippines Inc. 107,224 371 — 67,991 KEPCO Gansu International Ltd. 10,448 545 — (20 ) KEPCO Philippines Holdings Inc. 200,503 6,656 — 66,200 KEPCO Philippines Corporation 6,706 332 — (52 ) KEPCO Ilijan Corporation 371,377 56,156 95,072 40,818 KEPCO Lebanon SARL ￦ 1,835 9,786 — 255 KEPCO Neimenggu International Ltd. 200,858 — — (354 ) KEPCO Shanxi International Ltd. 538,604 208,895 — 151 KOMIPO Global Pte Ltd. 269,302 463 — 10,400 KEPCO Netherlands B.V. 122,577 101 — 948 KOREA Imouraren Uranium Investment Corp. 14,173 111 — (49,716 ) KEPCO Australia Pty., Ltd. 364 14 — (395,914 ) KOSEP Australia Pty., Ltd. 32,782 2,911 15,514 3,935 KOMIPO Australia Pty., Ltd. 40,898 2,909 15,514 3,766 KOWEPO Australia Pty., Ltd. 44,182 5,772 15,514 2,761 KOSPO Australia Pty., Ltd. 37,254 5,012 15,514 2,638 KEPCO Middle East Holding Company 102,164 87,834 — 5,934 Qatrana Electric Power Company 490,723 322,857 20,773 21,807 KHNP Canada Energy, Ltd. 44,639 43 — (10 ) KEPCO Bylong Australia Pty., Ltd. 45,207 355,163 — (220,909 ) Korea Waterbury Uranium Limited Partnership 20,717 167 — (77 ) KEPCO Holdings de Mexico 187 25 — (14 ) KST Electric Power Company 539,952 449,459 55,783 (20,797 ) KEPCO Energy Service Company 2,262 1,995 5,984 (481 ) KEPCO Netherlands S3 B.V. 50,352 49 — 2,637 PT. KOMIPO Pembangkitan Jawa Bali 12,391 5,719 18,722 4,312 PT. Cirebon Power Service 2,089 313 8,049 406 KOWEPO International Corporation — 10 — (2 ) KOSPO Jordan, LLC 17,489 1,521 10,878 2,634 EWP Philippines Corporation 1,691 888 — (111 ) EWP America Inc.(*1) 66,622 2,619 21,719 (6,497 ) KNF Canada Energy Limited 1,933 24 — (48 ) EWP Barbados 1 SRL 279,295 1,031 2,914 2,368 Gyeonggi Green Energy Co., Ltd. 194,425 159,078 13,717 (73,394 ) PT. Tanggamus Electric Power 228,601 195,826 2,256 (4,529 ) Gyeongju Wind Power Co., Ltd. 113,745 75,427 15,548 3,384 KOMIPO America Inc. 9,424 593 118 (1,033 ) KOSEP USA, Inc. 1 5,147 — (119 ) PT. EWP Indonesia 34,455 5 — 5,124 KEPCO Netherlands J3 B.V. 120,006 74 — (79 ) Korea Offshore Wind Power Co., Ltd. 284,495 117,527 — (12,768 ) Global One Pioneer B.V. 180 73 — (86 ) Global Energy Pioneer B.V. 348 80 — (90 ) Mira Power Limited 356,111 285,577 — (971 ) KOSEP Material Co., Ltd. 2,788 1,186 3,357 22 Commerce and Industry Energy Co., Ltd. 90,637 43,985 32,728 (7,532 ) KEPCO KPS Philippines Corp. 5,198 1,341 6,246 2 KOSPO Chile SpA ￦ 134,827 49,183 — (456 ) PT. KOWEPO Sumsel Operation And Maintenance Services 135 262 — (1,104 ) HeeMang Sunlight Power Co., Ltd. 12,185 8,545 643 75 Fujeij Wind Power Company 218,333 196,964 — 5,515 KOSPO Youngnam Power Co., Ltd. 398,495 307,226 318,338 3,514 VI Carbon Professional Private Special Asset Investment Trust 1 3,002 — — 12 Chitose Solar Power Plant LLC 121,457 106,254 17,103 5,480 KEPCO Energy Solution Co., Ltd. 308,188 2,142 2,843 2,805 Solar School Plant Co., Ltd. 208,730 3,269 1,962 2,553 KOSPO Power Services Limitada 3,244 1,564 10,013 452 Energy New Industry Specialized Investment Private Investment Trust(*2) 100,116 17,359 2,418 (7,735 ) KOEN Bylong Pty., Ltd. — 39 — (14 ) KOMIPO Bylong Pty., Ltd. 4 43 — (14 ) KOWEPO Bylong Pty., Ltd. 4 40 — (12 ) KOSPO Bylong Pty., Ltd. 4 40 — (12 ) EWP Bylong Pty., Ltd. 4 40 — (12 ) KOWEPO Lao International 5,430 575 4,308 1,584 KEPCO US Inc. 17,231 — — — KEPCO Alamosa LLC 33,515 183 145 (311 ) KEPCO Solar of Alamosa, LLC (formerly, Cogentrix of Alamosa, LLC) 65,468 50,348 8,739 (1,902 ) KEPCO-LG 27,439 30,287 — (1,240 ) Mangilao Investment LLC 39,972 — — — KEPCO-LG 39,373 11 — (524 ) Jeju Hanlim Offshore Wind Co., Ltd. 14,328 558 — (2,459 ) PT. Siborpa Eco Power 11,574 71 — (1,165 ) PT. Korea Energy Indonesia 1,592 121 2,462 323 KOLAT SpA 31,178 167 656 (296 ) KEPCO California, LLC 44,074 936 358 (513 ) KEPCO Mojave Holdings, LLC 103,815 69,544 — (4,215 ) Incheon Fuel Cell Co., Ltd. 22,669 475 — (1,010 ) KOEN Service Co., Ltd. 5,347 4,252 25,890 543 KOMIPO Service Co., Ltd. 3,327 2,622 24,556 146 KOWEPO Service Co., Ltd. 4,228 3,302 23,982 389 KOSPO Service Co., Ltd. 3,493 2,788 18,741 135 EWP Service Co., Ltd. 4,786 4,064 20,837 162 PT. KOMIPO Energy Indonesia 2,647 196 1,392 79 KNF partners Co., Ltd. 1,378 890 3,383 187 KOSPO USA Inc. 5,896 127 — (1,408 ) Nambu USA LLC ￦ 245 1 — 245 Tamra Offshore Wind Power Co., Ltd. 156,708 121,724 19,670 1,154 KEPCO MCS Co., Ltd. 26,510 22,151 129,393 3,408 KEPCO FMS Co., Ltd. 11,336 10,638 37,627 198 Firstkeepers Co., Ltd. 1,552 2,800 121 (2,239 ) Secutec Co., Ltd. 322 229 — (597 ) SE Green Energy Co., Ltd. 132,727 105,619 — 816 KEPCO Mangilao America LLC — — — — Mangilao Intermediate Holdings LLC 13,220 12,774 — (66 ) KEPCO CSC Co., Ltd. 837 51 — (14 ) KOAK Power Limited 15,930 — — — KOMIPO Europe B.V. 7,362 — — (286 ) Haenanum Energy Fund 28,101 1 — 1 Paju Ecoenergy Co., Ltd. 53,839 — — — (*1) Financial information of EWP America Inc. includes that of six other subsidiaries, EWP Renewable Corporation, DG Fairhaven Power, LLC, DG Whitefield, LLC, Springfield Power, LLC, California Power Holdings, LLC, and EWPRC Biomass Holdings, LLC. (*2) Financial information of Energy New Industry Specialized Investment Private Investment Trust includes that of three other subsidiaries, BSK E-New e-New e-New
Significant restrictions on abilities to subsidiaries	Significant restrictions on abilities to subsidiaries are as follows: Company Nature and extent of any significant restrictions Gyeonggi Green Energy Co., Ltd. Acquisition or disposal of assets of more than ￦35 billion, change in the capacity of cogeneration units (except for the change due to performance improvement of equipment, maintenance) will require unanimous consent of all directors of the company. KOSPO Youngnam Power Co., Ltd. Dividends can only be paid when all conditions of the loan agreement are satisfied, or prior written consent of financial institutions is obtained. Company’s shares cannot be wholly or partially transferred without prior written consent of financial institutions. Incheon Fuel Cell Co., Ltd. Acquisition or disposal of assets of more than ￦20 billion, change in the capacity of cogeneration units (except for the change due to performance improvement of equipment, maintenance) will require unanimous consent of all directors of the company.
Details of non-controlling interest prior to intra-group eliminations	Details of non-controlling 2017 Description KEPCO Ilijan KEPCO Plant KEPCO Construction Others Total In millions of won Percentage of ownership 49.00 % 49.00 % 33.92 % Current assets ￦ 160,588 623,934 257,529 1,269,175 2,311,226 Non-current 314,036 571,152 504,637 2,588,833 3,978,658 Current liabilities (21,546 ) (278,562 ) (221,860 ) (394,320 ) (916,288 ) Non-current (36,255 ) (16,127 ) (83,274 ) (2,014,925 ) (2,150,581 ) Net assets 416,823 900,397 457,032 1,448,763 3,223,015 Book value of non-controlling 204,243 441,194 155,025 612,245 1,412,707 Sales 109,183 1,232,113 490,193 719,087 2,550,576 Profit for the period 66,320 135,482 21,222 66,419 289,443 Profit for the period attributable to non-controlling 32,497 66,386 7,199 20,447 126,529 Cash flows from operating activities 123,534 129,801 62,578 60,021 375,934 Cash flows from investing activities (5,276 ) (193,408 ) (8,622 ) (409,353 ) (616,659 ) Cash flows from financing activities before dividends to non-controlling (44,442 ) (15,606 ) (55,504 ) 339,432 223,880 Dividends to non-controlling (48,855 ) (14,994 ) (1,419 ) (20,840 ) (86,108 ) Effect of exchange rate fluctuation (7,432 ) (1,267 ) (101 ) (24,206 ) (33,006 ) Net increase (decrease) of cash and cash equivalents 17,529 (95,474 ) (3,068 ) (54,946 ) (135,959 ) 2018 Description KEPCO Ilijan KEPCO Plant KEPCO Construction Others Total In millions of won Percentage of ownership 49.00 % 49.00 % 33.92 % Current assets ￦ 163,622 628,725 281,390 956,928 2,030,665 Non-current 267,822 646,640 490,090 2,760,500 4,165,052 Current liabilities (16,819 ) (270,097 ) (248,402 ) (559,552 ) (1,094,870 ) Non-current (36,594 ) (26,331 ) (61,698 ) (1,933,583 ) (2,058,206 ) Net assets 378,031 978,937 461,380 1,224,293 3,042,641 Book value of non-controlling 185,235 479,679 156,500 680,963 1,502,377 Sales 99,844 1,239,604 433,701 966,037 2,739,186 Profit for the period 49,631 160,791 12,937 92,457 315,816 Profit for the period attributable to non-controlling 24,319 78,788 4,388 28,475 135,970 Cash flows from operating activities 92,822 129,700 81,042 110,448 414,012 Cash flows from investing activities (4,452 ) (123,593 ) (50,569 ) 35,167 (143,447 ) Cash flows from financing activities before dividends to non-controlling (53,733 ) (33,737 ) (14,591 ) (374,669 ) (476,730 ) Dividends to non-controlling (51,626 ) (32,414 ) (2,839 ) (23,452 ) (110,331 ) Effect of exchange rate fluctuation 2,840 (124 ) 31 1,304 4,051 Net increase (decrease) of cash and cash equivalents (14,149 ) (60,168 ) 13,074 (251,202 ) (312,445 ) 2019 Description KEPCO Ilijan KEPCO Plant KEPCO Construction Others Total In millions of won Percentage of ownership 49.00 % 49.00 % 33.92 % Current assets ￦ 173,931 779,764 257,593 864,596 2,075,884 Non-current 197,446 577,219 477,614 3,169,317 4,421,596 Current liabilities (11,990 ) (247,737 ) (223,522 ) (450,311 ) (933,560 ) Non-current (44,166 ) (47,020 ) (19,472 ) (2,193,501 ) (2,304,159 ) Net assets 315,221 1,062,226 492,213 1,390,101 3,259,761 Book value of non-controlling 154,458 520,491 166,959 551,423 1,393,331 Sales 95,072 1,244,613 448,635 855,023 2,643,343 Profit for the period 40,818 157,737 26,398 (48,963 ) 175,990 Profit for the period attributable to non-controlling 20,001 77,291 8,954 (24,264 ) 81,982 Cash flows from operating activities 101,707 164,373 27,081 219,450 512,611 Cash flows from investing activities 4,458 (89,159 ) 47,219 (356,434 ) (393,916 ) Cash flows from financing activities before dividends to non-controlling (68,678 ) (44,332 ) (34,632 ) 223,233 75,591 Dividends to non-controlling (48,750 ) (39,466 ) (1,807 ) (9,233 ) (99,256 ) Effect of exchange rate fluctuation 2,111 (593 ) (14 ) 2,501 4,005 Net increase (decrease) of cash and cash equivalents (9,152 ) (9,177 ) 37,847 79,517 99,035
Changes in goodwill	Changes in goodwill (i) Details of goodwill as of December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Acquisition cost ￦ 2,582 97,977 Less: Accumulated impairment — — Carrying book value ￦ 2,582 97,977 (ii) Changes in goodwill for the years ended December 31, 2018 and 2019 are as follows: 2018 Beginning Increase Decrease Ending In millions of won Acquisition cost ￦ 2,582 — — 2,582 Less: Accumulated impairment — — — — Carrying book value 2,582 — — 2,582 2019 Beginning Increase Decrease Ending In millions of won Acquisition cost ￦ 2,582 95,395 — 97,977 Less: Accumulated impairment — — — — Carrying book value 2,582 95,395 — 97,977
Disposals of subsidiaries	The Company has completed liquidation process of KEPCO Singapore Holdings Pte., Ltd., and Korea Electric Power Nigeria Ltd., and is in the process of liquidating Garolim Tidal Power Plant Co., Ltd., as of December 31, 2019. (i) The fair value of proceeds from disposal as of December 31, 2017, 2018 and 2019, respectively, are as follows: 2017 2018 2019 In millions of won Consideration received in cash ￦ — 160 4 ￦ — 160 4 (ii) The carrying value of assets and liabilities of subsidiaries as of the date the Company lost its control during the years ended December 31, 2017, 2018 and 2019, respectively, are as follows: 2017 2018 2019 In millions of won Assets Cash and cash equivalents ￦ — 175 97 Trade and other receivables — 11 — Other non-financial — — 1 PP&E and intangible assets — — 2 Liabilities Trade and other payables — (28 ) (3 ) Other non-financial — — (24 ) ￦ — 158 73 (iii) Gain on disposals of subsidiaries for the years ended December 31, 2017, 2018 and 2019, respectively, are as follows: 2017 2018 2019 In millions of won Fair value of sale price ￦ — 160 4 Net assets disposed — (158 ) (73 ) Non-controlling — — — Realization of unrealized gain — 70 (187 ) Other comprehensive income — — — Gain (loss) on disposals of subsidiaries(*1) ￦ — 72 (256 ) (*1) Gain (loss) on disposals of subsidiaries is included in the consolidated statements of comprehensive income (loss). (iv) Net cash flow from disposals of subsidiaries for the years ended December 31, 2017, 2018 and 2019, respectively, are as follows: 2017 2018 2019 In millions of won Consideration received in cash ￦ — 160 4 Less: cash held by disposed subsidiaries — (175 ) (97 ) Net cash flow ￦ — (15 ) (93 )
Cash dividends received from subsidiaries	Cash dividends received from subsidiaries for the years ended December 31, 2017, 2018 and 2019, respectively, are as follows: Subsidiaries 2017 2018 2019 In millions of won Korea Hydro & Nuclear Power Co., Ltd. ￦ 543,072 281,234 — Korea South-East Power Co., Ltd. 106,546 33,928 7,143 Korea Midland Power Co., Ltd. 54,305 26,581 — Korea Western Power Co., Ltd. 66,992 28,996 — Korea Southern Power Co., Ltd. 60,630 25,780 15,277 Korea East-West Power Co., Ltd. 94,430 61,408 985 KEPCO Engineering & Construction Company, Inc. 2,765 5,531 3,519 KEPCO Plant Service & Engineering Co., Ltd. 15,607 33,739 41,084 KEPCO Nuclear Fuel Co., Ltd. 3,231 1,077 4,219 KEPCO KDN Co., Ltd. 4,352 13,888 19,136 KEPCO International HongKong Ltd. 4,304 23,314 10,243 KEPCO International Philippines Inc. 44,906 52,507 70,480 KEPCO Ilijan Corporation 50,849 53,900 65,776 KEPCO Philippines Holdings Inc. 26,023 — 63,522 KOSEP Australia Pty., Ltd. — — 8,120 KOSPO Australia Pty., Ltd. — — 4,335 Qatrana Electric Power Company 5,939 6,240 10,313 KEPCO KPS Philippines Corp. — — 3,854 Tamra Offshore Wind Power Co., Ltd. — — 4,823 KEPCO Netherlands S3 B.V. — 3,115 874 PT. KOMIPO Pembangkitan Jawa Bali 3,188 20,658 1,971 KEPCO Netherlands J3 B.V. — 12,090 — Gyeongju Wind Power Co., Ltd. — — 2,800 Energy New Industry Specialized Investment Private Investment Trust 291 — — HI Carbon Professional Private Special Asset Investment Trust 1 11 11 11 KOSPO Power Services Limitada 425 993 745 Cogentrix Solar Services, LLC 344 — — KEPCO Netherlands B.V. — 17,424 13,266 PT. Cirebon Power Service — 382 — Chitose Solar Power Plant LLC — 1,986 814 ￦ 1,088,210 704,782 353,310

Investments in Associates and_2

Investments in Associates and Joint Ventures (Tables)	12 Months Ended
	Dec. 31, 2019
Investments in Associates and Joint Ventures [Abstract]
Investments in Associates and Joint Ventures	Investments in associates and joint ventures as of December 31, 2018 and 2019 are as follows: 2018 Investees Key operation activities Location Percentage of Acquisition Book In millions of won <Associates> Korea Gas Corporation(*1) Importing and wholesaling LNG KOREA 20.47 % ￦ 94,500 1,701,848 Korea Electric Power Industrial Development Co., Ltd. Electricity metering and others KOREA 29.00 % 4,727 21,838 YTN Co., Ltd. Broadcasting KOREA 21.43 % 59,000 40,338 Cheongna Energy Co., Ltd. Generating and distributing vapor and hot/cold water KOREA 43.90 % 48,353 3,465 Gangwon Wind Power Co., Ltd.(*2) Power generation KOREA 15.00 % 5,725 13,220 Hyundai Green Power Co., Ltd. Power generation KOREA 29.00 % 88,885 127,160 Korea Power Exchange(*5) Management of power market and others KOREA 100.00 % 127,839 251,802 AMEC Partners Korea Ltd.(*3) Resources development KOREA 19.00 % 707 209 Hyundai Energy Co., Ltd.(*8) Power generation KOREA 30.66 % 71,070 — Ecollite Co., Ltd. Artificial light-weight aggregate KOREA 36.10 % 1,516 — Taebaek Wind Power Co., Ltd. Power generation KOREA 25.00 % 3,810 5,665 Taeback Guinemi Wind Power Co., Ltd. Power generation KOREA 25.00 % 3,420 2,569 Pyeongchang Wind Power Co., Ltd. Power generation KOREA 25.00 % 3,875 5,419 Daeryun Power Co., Ltd.(*3) Power generation KOREA 9.34 % 40,854 26,099 Changjuk Wind Power Co., Ltd. Power generation KOREA 30.00 % 3,801 8,086 KNH Solar Co., Ltd. Power generation KOREA 27.00 % 1,296 2,337 SPC Power Corporation Power generation PHILIPPINES 38.00 % 20,635 57,558 Gemeng International Energy Co., Ltd. Power generation CHINA 34.00 % 413,153 647,010 PT. Cirebon Electric Power Power generation INDONESIA 27.50 % 40,365 108,628 KNOC Nigerian East Oil Co., Ltd.(*4) Resources development NIGERIA 14.63 % 12 — KNOC Nigerian West Oil Co., Ltd.(*4) Resources development NIGERIA 14.63 % 12 — PT Wampu Electric Power Power generation INDONESIA 46.00 % 21,292 31,097 PT. Bayan Resources TBK Resources development INDONESIA 20.00 % 615,860 511,646 S-Power Power generation KOREA 49.00 % 132,300 114,566 Pioneer Gas Power Limited(*7) Power generation INDIA 38.50 % 49,831 20,395 Eurasia Energy Holdings Power generation and resources development RUSSIA 40.00 % 461 — Xe-Pian Xe-Namnoy Power generation LAOS 25.00 % 84,374 77,165 Hadong Mineral Fiber Co., Ltd.(*3) Recycling fly ashes KOREA 8.33 % 50 — Green Biomass Co., Ltd.(*10) Power generation KOREA 8.80 % 714 115 PT. Mutiara Jawa Manufacturing and operating floating coal terminal INDONESIA 29.00 % 2,978 365 Samcheok Eco Materials Co., Ltd.(*9) Recycling fly ashes KOREA 2.35 % 686 — Noeul Green Energy Co., Ltd. Power generation KOREA 29.00 % 1,740 8,015 Naepo Green Energy Co., Ltd. Power generation KOREA 41.67 % 29,200 — Goseong Green Energy Co., Ltd.(*2) Power generation KOREA 1.12 % 2,900 2,459 Gangneung Eco Power Co., Ltd.(*2) Power generation KOREA 1.61 % 2,900 2,495 Shin Pyeongtaek Power Co., Ltd. Power generation KOREA 40.00 % 72,000 67,600 Heang Bok Do Si Photovoltaic Power Co., Ltd. Power generation KOREA 28.00 % 194 202 Dongducheon Dream Power Co., Ltd.(*14) Power generation KOREA 33.61 % 148,105 76,386 Jinbhuvish Power Generation Pvt. Ltd.(*2) Power generation INDIA 5.16 % ￦ 9,000 — SE Green Energy Co., Ltd. Power generation KOREA 47.76 % 3,821 3,366 Daegu Photovoltaic Co., Ltd. Power generation KOREA 29.00 % 1,230 2,002 Jeongam Wind Power Co., Ltd. Power generation KOREA 40.00 % 5,580 4,589 Korea Power Engineering Service Co., Ltd. Construction and service KOREA 29.00 % 290 4,333 Busan Green Energy Co., Ltd. Power generation KOREA 29.00 % 5,243 12,537 Gunsan Bio Energy Co., Ltd.(*2) Power generation KOREA 18.87 % 1,000 — Korea Electric Vehicle Charging Service Electric vehicle charge service KOREA 28.00 % 2,800 1,593 Ulleungdo Natural Energy Co., Ltd. Renewable power generation KOREA 29.85 % 8,000 4,628 Korea Nuclear Partners Co., Ltd. Electric material agency KOREA 29.00 % 290 175 Tamra Offshore Wind Power Co., Ltd. Power generation KOREA 27.00 % 8,910 10,401 Korea Electric Power Corporation Fund(*11) Developing electric enterprises KOREA 98.09 % 51,500 47,189 Energy Infra Asset Management Co., Ltd.(*3) Asset management KOREA 9.90 % 297 665 Daegu clean Energy Co., Ltd. Renewable power generation KOREA 28.00 % 140 17 YaksuESS Co., Ltd Installing ESS related equipment KOREA 29.00 % 210 460 Nepal Water & Energy Development Company Private Limited(*13) Construction and operation of utility plant NEPAL 57.67 % 33,577 30,961 Gwangyang Green Energy Co., Ltd. Power generation KOREA 20.00 % 2,000 1,206 PND solar., Ltd Power generation KOREA 29.00 % 1,250 1,020 Hyundai Eco Energy Co., Ltd.(*2) Power generation KOREA 19.00 % 3,610 3,388 YeongGwang Yaksu Wind Electric. Co., Ltd(*2) Power generation KOREA 9.63 % 533 533 2,338,421 4,064,820 <Joint ventures> KEPCO-Uhde Inc.(*6) Power generation KOREA 52.80 % 11,355 188 Eco Biomass Energy Sdn. Bhd.(*6) Power generation MALAYSIA 61.53 % 14,439 — Shuweihat Asia Power Investment B.V. Holding company NETHERLANDS 49.00 % 44,405 27,251 Shuweihat Asia Operation & Maintenance Company(*6) Maintenance of utility plant CAYMAN 55.00 % 30 792 Waterbury Lake Uranium L.P. Resources development CANADA 34.07 % 26,602 19,032 ASM-BG Power generation BULGARIA 50.00 % 16,101 21,379 RES Technology AD Power generation BULGARIA 50.00 % 15,595 15,209 KV Holdings, Inc. Power generation PHILIPPINES 40.00 % 2,103 1,918 KEPCO SPC Power Corporation(*6) Construction and operation of utility plant PHILIPPINES 75.20 % 94,579 208,306 Gansu Datang Yumen Wind Power Co., Ltd. Power generation CHINA 40.00 % 16,621 9,981 Datang Chifeng Renewable Power Co., Ltd. Power generation CHINA 40.00 % 121,928 166,162 Datang KEPCO Chaoyang Renewable Power Co., Ltd. Power generation CHINA 40.00 % ￦ 10,858 39,442 Rabigh Electricity Company Power generation SAUDI ARABIA 40.00 % 109,743 105,328 Rabigh Operation & Maintenance Company Limited Maintenance of utility plant SAUDI ARABIA 40.00 % 70 5,834 Jamaica Public Service Company Limited Power generation JAMAICA 40.00 % 301,910 239,632 KW Nuclear Components Co., Ltd. Manufacturing KOREA 45.00 % 833 7,708 Busan Shinho Solar Power Co., Ltd. Power generation KOREA 25.00 % 2,100 4,761 GS Donghae Electric Power Co., Ltd. Power generation KOREA 34.00 % 204,000 240,591 Global Trade Of Power System Co., Ltd. Exporting products and technology of small or medium business by proxy KOREA 29.00 % 290 515 Expressway Solar-light Power Generation Co., Ltd. Power generation KOREA 29.00 % 1,856 2,676 Daejung Offshore Wind Power Co., Ltd. Power generation KOREA 49.90 % 5,190 2,669 Amman Asia Electric Power Company(*6) Power generation JORDAN 60.00 % 111,476 177,357 KAPES, Inc.(*6) R&D KOREA 51.00 % 5,629 9,079 Dangjin Eco Power Co., Ltd. Power generation KOREA 34.00 % 61,540 19,912 Honam Wind Power Co., Ltd. Power generation KOREA 29.00 % 3,480 4,860 Chun-cheon Energy Co., Ltd. Power generation KOREA 29.90 % 52,700 42,505 Yeonggwangbaeksu Wind Power Co., Ltd.(*3) Power generation KOREA 15.00 % 3,000 2,843 Nghi Son 2 Power LLC Power generation VIETNAM 50.00 % 2,781 — Kelar S.A(*6) Power generation CHILE 65.00 % 78,060 72,824 PT. Tanjung Power Indonesia Power generation INDONESIA 35.00 % 746 7,081 Incheon New Power Co., Ltd. Power generation KOREA 29.00 % 461 579 Seokmun Energy Co., Ltd. Power generation KOREA 29.00 % 15,370 16,751 Daehan Wind Power PSC Power generation JORDAN 50.00 % 3,191 1,632 Barakah One Company(*12) Power generation UAE 18.00 % 118 3,807 Nawah Energy Company(*12) Operation of utility plant UAE 18.00 % 296 274 MOMENTUM International thermonuclear experimental reactor construction management FRANCE 33.33 % 1 582 Daegu Green Power Co., Ltd. Power generation KOREA 29.00 % 46,225 41,110 Yeonggwang Wind Power Co., Ltd. Power generation KOREA 41.00 % 15,375 15,304 Chester Solar IV SpA(*6) Power generation CHILE 81.82 % 1,700 1,851 Chester Solar V SpA(*6) Power generation CHILE 81.82 % 525 474 Diego de Almagro Solar SpA(*6) Power generation CHILE 81.82 % 2,091 1,663 South Jamaica Power Company Limited Power generation JAMAICA 20.00 % 16,231 16,124 Daesan Green Energy Co., Ltd. Power generation KOREA 35.00 % 17,850 17,433 RE Holiday Holdings LLC Power generation USA 50.00 % 42,948 51,094 RE Pioneer Holdings LLC Power generation USA 50.00 % 27,891 38,898 RE Barren Ridge 1 Holdings LLC Power generation USA 50.00 % 28,021 41,415 RE Astoria 2 LandCo LLC Power generation USA 50.00 % 5,188 5,410 RE Barren Ridge LandCo LLC Power generation USA 50.00 % 2,187 1,898 Laurel SpA(*6) Power generation CHILE 81.82 % ￦ 1,222 921 KIAMCO KOWEPO Bannerton Hold Co Pty Ltd(*3) Power generation AUSTRALIA 12.37 % 4,095 3,940 Chile Solar JV SpA Power generation CHILE 50.00 % 36,654 36,865 Taebaek Gadeoksan Wind Power Co., Ltd. Power generation KOREA 46.58 % 8,500 8,508 Cheong-Song Noraesan Wind Power Co., Ltd. Power generation KOREA 24.76 % 2,073 2,073 Chester Solar I SpA(*6) Power generation CHILE 81.82 % 1,181 1,181 Solar Philippines Calatagan Corporation Power generation PHILIPPINES 38.00 % 47,903 47,903 1,647,317 1,813,525 ￦ 3,985,738 5,878,345 (*1) The effective percentage of ownership is 21.57% considering treasury stocks. (*2) The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint directors to the board of directors of the entity, and by strict decision criteria of the Company’s financial and operating policy of the board of directors. (*3) The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint a director to the board of directors of the entity. (*4) The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint one out of four members of the steering committee of the entity. Moreover, the Company has significant financial transactions, which can affect its influence on the entity. (*5) The effective percentage of ownership is 100%. However, the Government regulates the Company’s ability to make operating and financial decisions over the entity, as the Government requires maintaining arms-length transactions between KPX and the Company’s other subsidiaries. The Company can exercise significant influence by its right to nominate directors to the board of directors of the entity. (*6) The effective percentage of ownership is more than 50%. However, according to the shareholders’ agreement, all critical financial and operating decisions must be agreed to by all ownership parties. For this reason, the entities are classified as joint ventures. (*7) As of reporting date, the annual reporting period of all associates and joint ventures ends on December 31, except for Pioneer Gas Power Limited whose reporting period ends on March 31. (*8) As of December 31, 2018, 15.64% of ownership of Hyundai Energy Co., Ltd. is held by NH Power ll Co., Ltd. and NH Bank. According to the shareholders’ agreement reached on March 2011, not only does the Company have a call option to acquire the investment in Hyundai Energy Co., Ltd. from NH Power ll Co., Ltd. and NH Bank with a certain rate of return, NH Power ll Co., Ltd. and NH Bank also have put options to dispose of their investment to the Company. In connection with this agreement, the Company applied the equity method on the investment in Hyundai Energy Co., Ltd. with 46.30% of ownership. (*9) The Company’s effective percentage of ownership excluding the redeemable convertible preferred stock is 25.54%. (*10) The effective percentage of ownership is less than 20% but the Company can exercise significant influence by virtue of its contractual right to appoint a director to the board of directors of the entity and the fact that the dominant portion of the investee’s sales transactions is generated from the Company. (*11) The effective percentage of ownership is more than 50% but the Company does not hold control over relevant business while it exercises significant influence by participating in the Investment Decision Committee. For this reason, the entity is classified as an associate. (*12) The effective percentage of ownership is less than 20% but the Company has joint control over the entity as decisions on the major activities require the unanimous consent of the parties that collectively control the entity. (*13) The effective percentage of ownership is more than 50% but the Company does not hold control over the entity according to the shareholders’ agreement. For this reason, the entity is classified as an associate. (*14) The effective percentage of ownership is 34.01% considering redeemable convertible preferred stock. 2019 Investees Key operation activities Location Percentage of Acquisition Book value In millions of won <Associates> Korea Gas Corporation(*1) Importing and wholesaling LNG KOREA 20.47 % ￦ 94,500 1,693,967 Korea Electric Power Industrial Development Co., Ltd. Electricity metering and others KOREA 29.00 % 4,727 25,393 YTN Co., Ltd. Broadcasting KOREA 21.43 % 59,000 39,747 Cheongna Energy Co., Ltd. Generating and distributing vapor and hot/cold water KOREA 43.90 % 48,353 1,411 Gangwon Wind Power Co., Ltd.(*2) Power generation KOREA 15.00 % 5,725 12,327 Hyundai Green Power Co., Ltd. Power generation KOREA 29.00 % 88,885 124,253 Korea Power Exchange(*5) Management of power market and others KOREA 100.00 % 127,839 258,899 Hyundai Energy Co., Ltd.(*8) Power generation KOREA 30.66 % 71,070 — Ecollite Co., Ltd. Artificial light-weight aggregate KOREA 36.10 % 1,516 — Taebaek Wind Power Co., Ltd. Power generation KOREA 25.00 % 3,810 7,039 Taeback Guinemi Wind Power Co., Ltd. Power generation KOREA 25.00 % 3,420 2,553 Pyeongchang Wind Power Co., Ltd. Power generation KOREA 25.00 % 3,875 5,877 Daeryun Power Co., Ltd.(*3) Power generation KOREA 9.34 % 40,854 26,247 Changjuk Wind Power Co., Ltd. Power generation KOREA 30.00 % 3,801 8,520 KNH Solar Co., Ltd. Power generation KOREA 27.00 % 1,296 2,382 SPC Power Corporation Power generation PHILIPPINES 38.00 % 20,635 63,583 Gemeng International Energy Co., Ltd. Power generation CHINA 34.00 % 413,153 670,896 PT. Cirebon Electric Power Power generation INDONESIA 27.50 % 40,365 123,425 KNOC Nigerian East Oil Co., Ltd.(*4) Resources development NIGERIA 14.63 % 12 — KNOC Nigerian West Oil Co., Ltd.(*4) Resources development NIGERIA 14.63 % 12 — PT Wampu Electric Power Power generation INDONESIA 46.00 % 21,292 29,355 PT. Bayan Resources TBK Resources development INDONESIA 20.00 % 615,860 445,141 S-Power Power generation KOREA 49.00 % 132,300 115,784 Pioneer Gas Power Limited(*7) Power generation INDIA 38.50 % 49,831 — Eurasia Energy Holdings Power generation and resources development RUSSIA 40.00 % 461 — Xe-Pian Xe-Namnoy Power generation LAOS 25.00 % 87,426 72,935 Hadong Mineral Fiber Co., Ltd.(*3) Recycling fly ashes KOREA 8.33 % 50 — Green Biomass Co., Ltd.(*10) Power generation KOREA 7.85 % 714 108 PT. Mutiara Jawa Manufacturing and operating floating coal terminal INDONESIA 29.00 % 2,978 1,438 Samcheok Eco Materials Co., Ltd.(*9) Recycling fly ashes KOREA 2.35 % 686 — Noeul Green Energy Co., Ltd. Power generation KOREA 29.00 % 1,740 6,610 Naepo Green Energy Co., Ltd. Power generation KOREA 41.67 % 29,200 — Goseong Green Energy Co., Ltd.(*2) Power generation KOREA 1.12 % 2,900 2,340 Gangneung Eco Power Co., Ltd.(*2) Power generation KOREA 1.61 % ￦ 2,900 2,430 Shin Pyeongtaek Power Co., Ltd. Power generation KOREA 40.00 % 72,000 66,956 Heang Bok Do Si Photovoltaic Power Co., Ltd. Power generation KOREA 28.00 % 194 215 Dongducheon Dream Power Co., Ltd.(*14) Power generation KOREA 33.61 % 148,105 76,547 Jinbhuvish Power Generation Pvt. Ltd.(*2) Power generation INDIA 5.16 % 9,000 — Daejung Offshore Wind Power Co., Ltd.(*16) Power generation KOREA 49.90 % 5,190 2,361 GS Donghae Electric Power Co., Ltd.(*16) Power generation KOREA 34.00 % 204,000 255,983 Daegu Photovoltaic Co., Ltd. Power generation KOREA 29.00 % 1,230 2,060 Busan Green Energy Co., Ltd. Power generation KOREA 29.00 % 5,243 10,637 Gunsan Bio Energy Co., Ltd.(*2) Power generation KOREA 18.87 % 1,000 — Korea Electric Vehicle Charging Service Electric vehicle charge service KOREA 28.00 % 2,800 1,063 Korea Nuclear Partners Co., Ltd. Electric material agency KOREA 29.00 % 290 — Korea Electric Power Corporation Fund(*11) Developing electric enterprises KOREA 98.09 % 51,500 41,126 Energy Infra Asset Management Co., Ltd.(*3) Asset management KOREA 9.90 % 297 791 Daegu clean Energy Co., Ltd. Renewable power generation KOREA 28.00 % 140 13 YaksuESS Co., Ltd Installing ESS related equipment KOREA 29.00 % 210 516 Nepal Water & Energy Development Company Private Limited(*13) Construction and operation of utility plant NEPAL 57.76 % 35,571 31,145 Gwangyang Green Energy Co., Ltd. Power generation KOREA 20.00 % 2,000 948 PND solar., Ltd Power generation KOREA 29.00 % 1,250 1,144 Hyundai Eco Energy Co., Ltd.(*2) Power generation KOREA 19.00 % 3,610 3,781 YeongGwang Yaksu Wind Electric. Co., Ltd(*2) Power generation KOREA 9.63 % 533 386 Green Energy Electricity Generation Co., Ltd. Power generation KOREA 29.00 % 1,189 163 Korea Energy Solutions Co., Ltd. R & D KOREA 20.00 % 300 259 ITR Co., Ltd. R & D KOREA 20.00 % 50 33 Structure test network Co., Ltd. Technical testing and consulting KOREA 20.00 % 25 21 Namjeongsusang Solar Power Operation Co., Ltd.(*18) Power generation KOREA 15.00 % 969 812 Indeck Niles Development, LLC(*23) Power generation USA 50.00 % — — Indeck Niles Asset Management, LLC Power generation USA 33.33 % — 87 Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1 Holding company KOREA 49.00 % 7,105 7,126 Suwon New Power Co., Ltd. Power generation KOREA 39.90 % 798 798 KPGE Inc. Power generation materials business KOREA 29.00 % ￦ 287 287 Gwangbaek Solar Power Investment Co., Ltd.(*21) Power generation KOREA 19.00 % 2,054 2,054 Goduk Clean Energy Co., Ltd.(*20) Fuel cell generation KOREA 61.00 % 1,830 1,830 2,539,956 4,251,802 <Joint ventures> KEPCO-Uhde Inc.(*6) Power generation KOREA 52.80 % 11,355 134 Shuweihat Asia Power Investment B.V. Holding company NETHERLANDS 49.00 % 44,405 18,318 Shuweihat Asia Operation & Maintenance Company(*6) Maintenance of utility plant CAYMAN 55.00 % 30 1,408 Waterbury Lake Uranium L.P. Resources development CANADA 33.48 % 26,602 20,562 ASM-BG Power generation BULGARIA 50.00 % 16,101 19,376 RES Technology AD Power generation BULGARIA 50.00 % 15,595 16,248 KV Holdings, Inc. Power generation PHILIPPINES 40.00 % 2,103 2,441 KEPCO SPC Power Corporation(*6) Construction and operation of utility plant PHILIPPINES 75.20 % 94,579 214,794 Gansu Datang Yumen Wind Power Co., Ltd. Power generation CHINA 40.00 % 16,621 8,149 Datang Chifeng Renewable Power Co., Ltd. Power generation CHINA 40.00 % 121,928 185,307 Datang KEPCO Chaoyang Renewable Power Co., Ltd. Power generation CHINA 40.00 % 10,858 41,024 Rabigh Electricity Company Power generation SAUDI ARABIA 40.00 % 109,743 109,096 Rabigh Operation & Maintenance Company Limited Maintenance of utility plant SAUDI ARABIA 40.00 % 70 6,879 Jamaica Public Service Company Limited Power generation JAMAICA 40.00 % 301,910 253,607 KW Nuclear Components Co., Ltd. Manufacturing KOREA 45.00 % 833 9,052 Busan Shinho Solar Power Co., Ltd. Power generation KOREA 25.00 % 2,100 5,045 Global Trade Of Power System Co., Ltd. Exporting products and technology of small or medium business by proxy KOREA 29.00 % 290 571 Expressway Solar-light Power Generation Co., Ltd. Power generation KOREA 29.00 % 1,856 2,883 Amman Asia Electric Power Company(*6) Power generation JORDAN 60.00 % 111,476 192,164 KAPES, Inc.(*6) R&D KOREA 51.00 % 5,629 10,832 Honam Wind Power Co., Ltd. Power generation KOREA 29.00 % 3,480 4,375 Jeongam Wind Power Co., Ltd.(*16) Power generation KOREA 40.00 % 5,580 4,437 Korea Power Engineering Service Co., Ltd.(*16) Construction and service KOREA 29.00 % 290 4,902 Chun-cheon Energy Co., Ltd. Power generation KOREA 29.90 % 52,700 34,872 Yeonggwangbaeksu Wind Power Co., Ltd.(*3) Power generation KOREA 15.00 % 3,000 3,040 Nghi Son 2 Power LLC Power generation VIETNAM 50.00 % 2,781 — Kelar S.A(*6) Power generation CHILE 65.00 % ￦ 78,060 70,462 PT. Tanjung Power Indonesia Power generation INDONESIA 35.00 % 26,892 34,327 Incheon New Power Co., Ltd. Power generation KOREA 29.00 % 461 — Seokmun Energy Co., Ltd. Power generation KOREA 29.00 % 15,370 17,342 Daehan Wind Power PSC Power generation JORDAN 50.00 % 3,191 1,757 Barakah One Company(*12) Power generation UAE 18.00 % 118 — Nawah Energy Company(*12) Operation of utility plant UAE 18.00 % 296 285 MOMENTUM International thermonuclear experimental reactor construction management FRANCE 33.33 % 1 553 Daegu Green Power Co., Ltd. Power generation KOREA 29.00 % 46,225 22,824 Yeonggwang Wind Power Co., Ltd. Power generation KOREA 46.00 % 17,475 17,627 Chester Solar IV SpA Power generation CHILE 45.00 % 1,700 672 Chester Solar V SpA Power generation CHILE 45.00 % 525 146 Diego de Almagro Solar SpA Power generation CHILE 45.00 % 2,091 1,035 South Jamaica Power Company Limited Power generation JAMAICA 20.00 % 20,521 13,863 Daesan Green Energy Co., Ltd. Power generation KOREA 35.00 % 17,850 17,182 RE Holiday Holdings LLC Power generation USA 50.00 % 42,948 42,070 RE Pioneer Holdings LLC Power generation USA 50.00 % 27,891 31,156 RE Barren Ridge 1 Holdings LLC Power generation USA 50.00 % 28,021 42,916 RE Astoria 2 LandCo LLC Power generation USA 50.00 % 5,188 5,602 RE Barren Ridge LandCo LLC Power generation USA 50.00 % 2,187 1,966 Laurel SpA Power generation CHILE 45.00 % 1,222 595 KIAMCO KOWEPO Bannerton Hold Co Pty Ltd(*3) Power generation AUSTRALIA 12.37 % 4,095 4,024 Chile Solar JV SpA Power generation CHILE 50.00 % 37,689 34,859 Taebaek Gadeoksan Wind Power Co., Ltd. Power generation KOREA 37.78 % 8,500 7,846 Cheong-Song Noraesan Wind Power Co., Ltd. Power generation KOREA 29.01 % 3,200 3,043 Chester Solar I SpA Power generation CHILE 45.00 % 1,181 1,157 Solar Philippines Calatagan Corporation Power generation PHILIPPINES 38.00 % 47,903 48,930 Saemangeum Solar Power Co., Ltd.(*22) Power generation KOREA 81.00 % 10,000 8,324 Chungsongmeon BongSan wind power Co., Ltd. Power generation KOREA 29.00 % 2,900 2,764 Jaeun Resident Wind Power Plant Co., Ltd. Power generation KOREA 29.00 % 2,494 2,198 DE Energia SpA Power generation CHILE 49.00 % 8,364 8,665 Dangjin Eco Power Co., Ltd. (newly)(*15) Power generation KOREA 34.00 % 25,661 25,661 Haemodum Solar Co., Ltd. Power generation KOREA 49.00 % 2,940 2,940 Yangyang Wind Power Co., Ltd.(*17) Power generation KOREA 99.54 % 10,800 10,800 HORUS SOLAR, S.A. DE C.V.(*19) Renewable power generation MEXICO 14.95 % 3,403 3,403 RECURSOS SOLARES PV DE MEXICO II, S.A. DE C.V.(*19) Renewable power generation MEXICO 14.95 % ￦ 672 672 SUNMEX RENOVABLES, S.A. DE C.V.(*19) Renewable power generation MEXICO 14.95 % 222 222 Stavro Holding II AB Holding company SWEDEN 20.00 % 5,524 5,625 1,475,696 1,663,029 ￦ 4,015,652 5,914,831 (*1) The effective percentage of ownership is 21.57% considering treasury stocks. (*2) The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint directors to the board of directors of the entity, and by strict decision criteria of the Company’s financial and operating policy of the board of directors. (*3) The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint a director to the board of directors of the entity. (*4) The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint one out of four members of the steering committee of the entity. Moreover, the Company has significant financial transactions, which can affect its influence on the entity. (*5) The effective percentage of ownership is 100%. However, the Government regulates the Company’s ability to make operating and financial decisions over the entity, as the Government requires maintaining arms-length transactions between KPX and the Company’s other subsidiaries. The Company can exercise significant influence by virtue of right to nominate directors to the board of directors of the entity. (*6) The effective percentage of ownership is more than 50%. However, according to the shareholders’ agreement, all critical financial and operating decisions must be agreed to by all ownership parties. For this reason, the entities are classified as joint ventures. (*7) As of reporting date, the annual reporting period of all associates and joint ventures ends on December 31, except for Pioneer Gas Power Limited whose reporting period ends on March 31. (*8) As of December 31, 2019, 15.64% of ownership of Hyundai Energy Co., Ltd. is held by NH Power ll Co., Ltd. and NH Bank. According to the shareholders’ agreement reached on March 2011, not only does the Company have a call option to acquire the investment in Hyundai Energy Co., Ltd. from NH Power ll Co., Ltd. and NH Bank with a certain rate of return, NH Power ll Co., Ltd. and NH Bank also have put options to dispose of their investment to the Company. In connection with this agreement, the Company applied the equity method on the investment in Hyundai Energy Co., Ltd. with 46.30% of ownership. (*9) The Company’s effective percentage of ownership excluding the redeemable convertible preferred stock is 25.54%. (*10) The effective percentage of ownership is less than 20% but the Company can exercise significant influence by virtue of its contractual right to appoint a director to the board of directors of the entity and the fact that the dominant portion of the investee’s sales transactions is generated from the Company. (*11) The effective percentage of ownership is more than 50% but the Company does not hold control over relevant business while it exercises significant influence by participating in the Investment Decision Committee. For this reason, the entity is classified as an associate. (*12) The effective percentage of ownership is less than 20% but the Company has joint control over the entity as decisions on the major activities require the unanimous consent of the parties that collectively control the entity. (*13) The effective percentage of ownership is more than 50% but the Company does not hold control over the entity according to the shareholders’ agreement. For this reason, the entity is classified as an associate. (*14) The effective percentage of ownership is 34.01% considering the conversion of redeemable convertible preferred stock into ordinary stock. (*15) Eumseong Natural Gas Power Co., Ltd. and Dangjin Eco Solar Power Co., Ltd. were established by spin-off spin-off, (*16) Daejung Offshore Wind Power Co., Ltd. and GS Donghae Electric Power Co., Ltd. are reclassified from joint ventures to associates, and Jeongam Wind Power Co., Ltd. and Korea Power Engineering Service Co., Ltd. are reclassified from associates to joint ventures during the year ended December 31, 2019. (*17) The temporary percentage of ownership is more than 50% due to differences in the timing of the payment. The Company is expected to exert significant influence after payment is completed in the first quarter of 2020. (*18) The effective percentage of ownership is less than 20%. However, the Company considers the major decision-making body to be the general decision of the board of directors, and the general decision of the board of directors can be passed only by two directors. For this reason, the entities are classified as an associate. (*19) The effective percentage of ownership is less than 20%. However, according to the shareholders’ agreement, decisions on the major activities must be agreed to by all ownership parties. For this reason, the entities are classified as joint ventures. (*20) The effective percentage of ownership is 61%. However, it seems the Company doesn’t have power on the Goduk Clean Energy Co., Ltd. due to its proportion to make decisions, which is less than 50%. The Company can exercise significant influence on the entity by participating in the board of directors and others. Therefore, the entity is classified as an associate. (*21) The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint a director to the board of directors of the entity. (*22) The effective percentage of ownership is more than 50%. However, according to the shareholders’ agreement, all operation related decisions must be agreed by all ownership parties. For this reason, the entity is classified as a joint venture. (*23) Although the investment amount is not paid as of December 31, 2019, the Company has an investment agreement on 50% of the interests. the Company can exercise significant influence by virtue of its contractual right to appoint a director to the board of directors of the entity.
The fair value of associates	The fair value of associates which are actively traded on an open market and have a readily available market value as of December 31, 2018 and 2019 are as follows: Investees 2018 2019 In millions of won <Associates> Korea Electric Power Industrial Development Co., Ltd. ￦ 33,609 33,089 Korea Gas Corporation(*) 910,980 715,365 YTN Co., Ltd. 18,900 18,450 SPC Power Corporation 72,710 117,230 PT. Bayan Resources TBK 1,017,601 880,860 (*) An indicator of impairment has been identified for the Company’s investment in Korea Gas Corporation (‘‘KOGAS’’) for the years ended December 31, 2018 and 2019 as management determined that the carrying amount of the investment in KOGAS at ￦1,701,848 million and ￦1,693,967 million respectively were significantly higher than its fair value. Accordingly, management has assessed the recoverable amount of the investment by estimating the Company’s share of the present value of the estimated future cash flows expected to be generated by KOGAS. The carrying amount of KOGAS as at December 31, 2018 and 2019 are supported by the recoverable amount determination and as such, no impairment has been recognized for the years ended December 31, 2018 and 2019. The recoverable amount estimate is most sensitive to assumptions regarding long-term revenue forecasts as well as the discount rate: • Revenue forecasts: price and volume of gas sold are based on the long-term natural gas supply and demand programs approved by the Ministry of Trade, Industry & Energy. • Discount rate: the discount rate is derived using the weighted average cost of capital methodology adjusted for any risks that are not reflected in the underlying cash flows. A real post-tax discount rate of 4.80% and 4.70% was applied to post-tax cash flows respectively as at December 31, 2018 and 2019. Changes in circumstances may affect the assumptions used to determine recoverable amount and could result in an impairment of KOGAS at future reporting dates.
Changes in investments in associates and joint ventures	Changes in investments in associates and joint ventures for the years ended December 31, 2018 and 2019 are as follows: 2018 Investees Beginning Acquisition Disposal Dividends Share of Other (loss) Others Ending In millions of won <Associates> Korea Gas Corporation ￦ 1,618,868 — — — 107,952 (24,843 ) (129 ) 1,701,848 Korea Electric Power Industrial Development Co., Ltd. 21,838 — — (1,872 ) 2,584 (102 ) (610 ) 21,838 YTN Co., Ltd. 40,606 — — (180 ) 545 (186 ) (447 ) 40,338 Cheongna Energy Co., Ltd. 8,337 — — — (4,872 ) — — 3,465 Gangwon Wind Power Co., Ltd. 13,855 — — (2,272 ) 1,637 — — 13,220 Hyundai Green Power Co., Ltd. 114,806 — — (8,889 ) 21,243 — — 127,160 Korea Power Exchange 237,631 — — — 16,031 — (1,860 ) 251,802 AMEC Partners Korea Ltd. 215 — — — (6 ) — — 209 Hyundai Energy Co., Ltd. — — — — — — — — Ecollite Co., Ltd. — — — — — — — — Taebaek Wind Power Co., Ltd. 5,319 — — (196 ) 542 — — 5,665 Taeback Guinemi Wind Power Co., Ltd. 3,089 — — — (520 ) — — 2,569 Pyeongchang Wind Power Co., Ltd. 4,136 — — — 1,283 — — 5,419 Daeryun Power Co., Ltd.(*5) 25,113 — — — (189 ) 184 991 26,099 Changjuk Wind Power Co., Ltd. 7,515 — — (416 ) 987 — — 8,086 KNH Solar Co., Ltd. 2,218 — — — 119 — — 2,337 SPC Power Corporation 52,283 — — (9,549 ) 4,235 10,578 11 57,558 Gemeng International Energy Co., Ltd. 649,973 — — (11,246 ) 15,156 (6,873 ) — 647,010 PT. Cirebon Electric Power 97,410 — — (4,432 ) 9,385 6,265 — 108,628 KNOC Nigerian East Oil Co., Ltd. — — — — 2,615 (471 ) (2,144 ) — KNOC Nigerian West Oil Co., Ltd. — — — — 2,342 (414 ) (1,928 ) — PT Wampu Electric Power 29,403 — — — 408 1,286 — 31,097 PT. Bayan Resources TBK 451,831 — — (33,651 ) 74,776 18,690 — 511,646 S-Power ￦ 116,945 — — — (2,326 ) — (53 ) 114,566 Pioneer Gas Power Limited 38,659 — — — (17,684 ) (580 ) — 20,395 Eurasia Energy Holdings — — — — — — — — Xe-Pian Xe-Namnoy 61,779 12,893 — — (479 ) 2,972 — 77,165 Hadong Mineral Fiber Co., Ltd. — — — — — — — — Green Biomass Co., Ltd. 208 — — — (93 ) — — 115 PT. Mutiara Jawa — — — — 349 16 — 365 Samcheok Eco Materials Co., Ltd. — — — — — — — — Noeul Green Energy Co., Ltd. 2,067 — — — 5,687 — 261 8,015 Naepo Green Energy Co., Ltd.(*4) 20,598 — — — (13,511 ) — (7,087 ) — Goseong Green Energy Co., Ltd. 2,597 — — — (138 ) — — 2,459 Gangneung Eco Power Co., Ltd. 2,583 — — — (88 ) — — 2,495 Shin Pyeongtaek Power Co., Ltd. 34,903 28,080 — — (2,946 ) 6,673 890 67,600 Heang Bok Do Si Photovoltaic Power Co., Ltd. 187 — — — 15 — — 202 Dongducheon Dream Power Co., Ltd. 53,233 36,971 — — (13,824 ) — 6 76,386 Jinbhuvish Power Generation Pvt. Ltd. — — — — — — — — SE Green Energy Co., Ltd. 3,476 — — — (110 ) — — 3,366 Daegu Photovoltaic Co., Ltd. 1,718 — — (128 ) 412 — — 2,002 Jeongam Wind Power Co., Ltd. 3,763 — — — 826 — — 4,589 Korea Power Engineering Service Co., Ltd. 3,659 — — (218 ) 929 — (37 ) 4,333 Busan Green Energy Co., Ltd. 7,363 — — — 5,037 — 137 12,537 Gunsan Bio Energy Co., Ltd. — — — — — — — — Korea Electric Vehicle Charging Service 1,749 196 — — (352 ) — — 1,593 Ulleungdo Natural Energy Co., Ltd. 6,370 — — — (1,749 ) — 7 4,628 Korea Nuclear Partners Co., Ltd. 383 — — — (208 ) — — 175 Tamra Offshore Wind Power Co., Ltd. 8,560 — — — 1,841 — — 10,401 Korea Electric Power Corporation Fund 47,974 — — — (505 ) (280 ) — 47,189 Energy Infra Asset Management Co., Ltd. 476 — — — 189 — — 665 Daegu clean Energy Co., Ltd. 11 — — — 6 — — 17 YaksuESS Co., Ltd 194 — — — 266 — — 460 Nepal Water & Energy Development Company Private Limited 30,498 — — — (770 ) 1,233 — 30,961 Gwangyang Green Energy Co., Ltd. 1,772 — — — (566 ) — — 1,206 PND solar., Ltd 1,250 — — — (230 ) — — 1,020 Hyundai Eco Energy Co., Ltd. — 3,610 — — (222 ) — — 3,388 YeongGwang Yaksu Wind Electric. Co., Ltd — 533 — — — — — 533 3,837,421 82,283 — (73,049 ) 216,009 14,148 (11,992 ) 4,064,820 <Joint ventures> KEPCO-Uhde Inc. 258 — — — (70 ) — — 188 Eco Biomass Energy Sdn. Bhd. — — — — — — — — Datang Chaoyang Renewable Power Co., Ltd.(*3) ￦ 27,262 — — — 743 1,009 (29,014 ) — Shuweihat Asia Power Investment B.V. 15,675 — (1,632 ) (499 ) 3,075 10,632 — 27,251 Shuweihat Asia Operation & Maintenance Company 663 — — (859 ) 946 42 — 792 Waterbury Lake Uranium L.P. 19,781 — — — (3 ) (746 ) — 19,032 ASM-BG 21,202 — — (1,039 ) 2,236 (1,020 ) — 21,379 RES Technology AD 14,375 — — — 812 22 — 15,209 KV Holdings, Inc. 1,918 — — (735 ) 772 (37 ) — 1,918 KEPCO SPC Power Corporation 217,094 — — (41,601 ) 44,909 (12,092 ) (4 ) 208,306 Gansu Datang Yumen Wind Power Co., Ltd. 10,840 — — — (818 ) (41 ) — 9,981 Datang Chifeng Renewable Power Co., Ltd. 171,055 — — (18,859 ) 14,808 (842 ) — 166,162 Datang KEPCO Chaoyang Renewable Power Co., Ltd.(*3) 11,060 — — — 582 (1,214 ) 29,014 39,442 Rabigh Electricity Company 99,356 — — (29,067 ) 13,305 22,371 (637 ) 105,328 Rabigh Operation & Maintenance Company Limited 3,987 — — (1,147 ) 2,820 174 — 5,834 Jamaica Public Service Company Limited 221,153 — — (4,472 ) 13,099 9,852 — 239,632 KW Nuclear Components Co., Ltd. 6,703 — — (208 ) 1,213 — — 7,708 Busan Shinho Solar Power Co., Ltd. 4,346 — — (340 ) 755 — — 4,761 GS Donghae Electric Power Co., Ltd. 220,727 — — — 20,061 — (197 ) 240,591 Global Trade Of Power System Co., Ltd. 577 — — — (62 ) — — 515 Expressway Solar-light Power Generation Co., Ltd. 2,463 — — — 213 — — 2,676 KODE NOVUS I LLC(*1) — — — — — 1,374 (1,374 ) — KODE NOVUS II LLC(*2) — — — — — 810 (810 ) — Daejung Offshore Wind Power Co., Ltd. 2,969 — — — (300 ) — — 2,669 Amman Asia Electric Power Company 145,676 — — — 19,604 12,077 — 177,357 KAPES, Inc. 7,476 — — — 1,543 — 60 9,079 Dangjin Eco Power Co., Ltd. 57,928 — — — (38,042 ) (65 ) 91 19,912 Honam Wind Power Co., Ltd. 4,302 — — (348 ) 906 — — 4,860 Chun-cheon Energy Co., Ltd. 48,118 — — — (5,613 ) — — 42,505 Yeonggwangbaeksu Wind Power Co., Ltd. 2,734 — — — 109 — — 2,843 Nghi Son 2 Power LLC 183 — — — 2,657 (2,840 ) — — Kelar S.A 67,233 — — — 2,732 2,859 — 72,824 PT. Tanjung Power Indonesia 1,776 — — — 3,373 1,928 4 7,081 Incheon New Power Co., Ltd. 619 — — (41 ) 1 — — 579 Seokmun Energy Co., Ltd. 13,786 — — — 2,965 — — 16,751 Daehan Wind Power PSC — 2,288 — — (1,311 ) 37 618 1,632 Barakah One Company 626 — — — 2,162 1,019 — 3,807 Nawah Energy Company 258 — — — 4 12 — 274 MOMENTUM 391 — — — 195 (4 ) — 582 Daegu Green Power Co., Ltd. ￦ 42,391 — — — (1,283 ) — 2 41,110 Yeonggwang Wind Power Co., Ltd. 15,294 — — — 10 — — 15,304 Chester Solar IV SpA 1,700 — — — 301 (150 ) — 1,851 Chester Solar V SpA 525 — — — (21 ) (30 ) — 474 Diego de Almagro Solar SpA 2,091 — — — (299 ) (129 ) — 1,663 South Jamaica Power Company Limited 6,704 9,141 — — (184 ) 463 — 16,124 Daesan Green Energy Co., Ltd. — 17,850 — — (417 ) — — 17,433 RE Holiday Holdings LLC — 42,948 — (112 ) 8,055 203 — 51,094 RE Pioneer Holdings LLC — 27,891 — (979 ) 11,585 401 — 38,898 RE Barren Ridge 1 Holdings LLC — 28,021 — (1,114 ) 13,994 514 — 41,415 RE Astoria 2 LandCo LLC — 5,188 — (504 ) 866 (140 ) — 5,410 RE Barren Ridge LandCo LLC — 2,187 — (202 ) (25 ) (62 ) — 1,898 Laurel SpA — 1,222 — — (309 ) 8 — 921 KIAMCO KOWEPO Bannerton Hold Co Pty Ltd — 4,095 — — (23 ) (132 ) — 3,940 Chile Solar JV SpA — 36,654 — — 4,453 (5,278 ) 1,036 36,865 Taebaek Gadeoksan Wind Power Co., Ltd. — 8,500 — — 8 — — 8,508 Cheong-Song Noraesan Wind Power Co., Ltd. — 2,073 — — — — — 2,073 Chester Solar I SpA — 1,181 — — — — — 1,181 Solar Philippines Calatagan Corporation — 47,903 — — — — — 47,903 1,493,275 237,142 (1,632 ) (102,126 ) 147,092 40,985 (1,211 ) 1,813,525 ￦ 5,330,696 319,425 (1,632 ) (175,175 ) 363,101 55,133 (13,203 ) 5,878,345 (*1) The Company reclassified its shares of KODE NOVUS I LLC to financial assets at FVOCI during the year ended December 31, 2018 due to non-participation (*2) The Company sold all of its shares of KODE NOVUS II LLC during the year ended December 31, 2018. (*3) Datang Chaoyang Renewable Power Co., Ltd. was merged with Datang KEPCO Chaoyang Renewable Power Co., Ltd. during the year ended December 31, 2018. (*4) It was determined that there is objective evidence of impairment due to prolonged operating losses. As a result, the Company recognized an impairment loss of ￦7,087 million in impairment loss on investments in associates and joint ventures for the year ended December 31, 2018. (*5) It was determined that there is objective evidence of impairment due to prolonged operating losses. As a result, the Company recognized an impairment loss of ￦820 million in impairment loss on investments in associates and joint ventures for the year ended December 31, 2018. 2019 Investees Beginning Acquisition Disposal Dividends Share of Other Others Ending In millions of won <Associates> Korea Gas Corporation ￦ 1,701,848 — — (25,704 ) 8,511 12,687 (3,375 ) 1,693,967 Korea Electric Power Industrial Development Co., Ltd. 21,838 — — (1,598 ) 5,002 — 151 25,393 YTN Co., Ltd. 40,338 — — (180 ) (449 ) 5 33 39,747 Cheongna Energy Co., Ltd. 3,465 — — — (2,054 ) — — 1,411 Gangwon Wind Power Co., Ltd. 13,220 — — (2,272 ) 1,379 — — 12,327 Hyundai Green Power Co., Ltd. 127,160 — — (8,889 ) 5,982 — — 124,253 Korea Power Exchange 251,802 — — — 10,907 — (3,810 ) 258,899 AMEC Partners Korea Ltd. 209 — — — — 3 (212 ) — Hyundai Energy Co., Ltd. — — — — — — — — Ecollite Co., Ltd. — — — — — — — — Taebaek Wind Power Co., Ltd. 5,665 — — — 1,374 — — 7,039 Taeback Guinemi Wind Power Co., Ltd. 2,569 — — — (16 ) — — 2,553 Pyeongchang Wind Power Co., Ltd. 5,419 — — — 458 — — 5,877 Daeryun Power Co., Ltd. 26,099 — — — 173 — (25 ) 26,247 Changjuk Wind Power Co., Ltd. 8,086 — — — 434 — — 8,520 KNH Solar Co., Ltd. 2,337 — — — 45 — — 2,382 SPC Power Corporation 57,558 — — (14,229 ) 5,929 14,286 39 63,583 Gemeng International Energy Co., Ltd. 647,010 — — (11,468 ) 26,300 9,209 (155 ) 670,896 PT. Cirebon Electric Power 108,628 — — — 11,079 (65 ) 3,783 123,425 KNOC Nigerian East Oil Co., Ltd. — — — — (27 ) (380 ) 407 — KNOC Nigerian West Oil Co., Ltd. — — — — (29 ) (349 ) 378 — PT Wampu Electric Power 31,097 — — — (2,867 ) 2 1,123 29,355 PT. Bayan Resources TBK 511,646 — — (71,100 ) 6,181 (1,586 ) — 445,141 S-Power 114,566 — — — 1,218 — — 115,784 Pioneer Gas Power Limited 20,395 — — — (20,784 ) 389 — — Eurasia Energy Holdings — — — — — — — — Xe-Pian Xe-Namnoy 77,165 3,052 — — (10,210 ) 2,928 — 72,935 Hadong Mineral Fiber Co., Ltd. — — — — — — — — Green Biomass Co., Ltd. 115 — — — (73 ) — 66 108 PT. Mutiara Jawa 365 — — — 1,031 42 — 1,438 Samcheok Eco Materials Co., Ltd. — — — — — — — — Noeul Green Energy Co., Ltd. 8,015 — — — (1,395 ) — (10 ) 6,610 Naepo Green Energy Co., Ltd. — — — — — — — — Goseong Green Energy Co., Ltd. 2,459 — — — (119 ) — — 2,340 Gangneung Eco Power Co., Ltd. 2,495 — — — (65 ) — — 2,430 Shin Pyeongtaek Power Co., Ltd. 67,600 — — — (827 ) 198 (15 ) 66,956 Heang Bok Do Si Photovoltaic Power Co., Ltd. 202 — — — 13 — — 215 Dongducheon Dream Power Co., Ltd. 76,386 — — — 441 — (280 ) 76,547 Jinbhuvish Power Generation Pvt. Ltd. — — — — — — — — Daejung Offshore Wind Power Co., Ltd. ￦ — — — — — — 2,361 2,361 GS Donghae Electric Power Co., Ltd. — — — — — — 255,983 255,983 SE Green Energy Co., Ltd. 3,366 — — — — (75 ) (3,291 ) — Daegu Photovoltaic Co., Ltd. 2,002 — — (327 ) 385 — — 2,060 Jeongam Wind Power Co., Ltd. 4,589 — — — (152 ) — (4,437 ) — Korea Power Engineering Service Co., Ltd. 4,333 — — — 508 — (4,841 ) — Busan Green Energy Co., Ltd. 12,537 — — — (1,884 ) — (16 ) 10,637 Gunsan Bio Energy Co., Ltd. — — — — — — — — Korea Electric Vehicle Charging Service 1,593 — — — (515 ) — (15 ) 1,063 Ulleungdo Natural Energy Co., Ltd. 4,628 — — — (1 ) — (4,627 ) — Korea Nuclear Partners Co., Ltd.(*1) 175 — — — (79 ) — (96 ) — Tamra Offshore Wind Power Co., Ltd. 10,401 — — — — — (10,401 ) — Korea Electric Power Corporation Fund 47,189 — — — (6,931 ) 868 — 41,126 Energy Infra Asset Management Co., Ltd. 665 — — — 126 — — 791 Daegu clean Energy Co., Ltd. 17 — — — (4 ) — — 13 YaksuESS Co., Ltd 460 — — — 56 — — 516 Nepal Water & Energy Development Company Private Limited 30,961 — — — (854 ) 1,038 — 31,145 Gwangyang Green Energy Co., Ltd. 1,206 — — — (258 ) — — 948 PND solar., Ltd 1,020 — — — 124 — — 1,144 Hyundai Eco Energy Co., Ltd. 3,388 — — — 393 — — 3,781 YeongGwang Yaksu Wind Electric. Co., Ltd 533 — — — (147 ) — — 386 Green Energy Electricity Generation Co., Ltd. — 1,189 — — (1,026 ) — — 163 Korea Energy Solutions Co., Ltd. — 300 — — (41 ) — — 259 ITR Co., Ltd. — 50 — — (17 ) — — 33 Structure test network Co., Ltd. — 25 — — (4 ) — — 21 Namjeongsusang Solar Power Operation Co., Ltd. — 969 — — (157 ) — — 812 Indeck Niles Development, LLC — — — — — — — — Indeck Niles Asset Management, LLC — — — (245 ) 333 (1 ) — 87 Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1 — 7,105 — — 21 — — 7,126 Suwon New Power Co., Ltd. — 798 — — — — — 798 KPGE Inc. — 287 — — — — — 287 Gwangbaek Solar Power Investment Co., Ltd. — 2,054 — — — — — 2,054 Goduk Clean Energy Co., Ltd. — 1,830 — — — — — 1,830 ￦ 4,064,820 17,659 — (136,012 ) 37,418 39,199 228,718 4,251,802 <Joint ventures> KEPCO-Uhde Inc. ￦ 188 — — — (54 ) — — 134 Eco Biomass Energy Sdn. Bhd. — — — — — — — — Shuweihat Asia Power Investment B.V. 27,251 — — (2,176 ) 5,288 (12,045 ) — 18,318 Shuweihat Asia Operation & Maintenance Company 792 — — (907 ) 1,040 (1 ) 484 1,408 Waterbury Lake Uranium L.P. 19,032 — — — 22 1,508 — 20,562 ASM-BG 21,379 — — (4,760 ) 2,442 315 — 19,376 RES Technology AD 15,209 — — — 963 76 — 16,248 KV Holdings, Inc. 1,918 — — (372 ) 751 144 — 2,441 KEPCO SPC Power Corporation 208,306 — — (45,349 ) 48,043 3,781 13 214,794 Gansu Datang Yumen Wind Power Co., Ltd. 9,981 — — — (2,050 ) 218 — 8,149 Datang Chifeng Renewable Power Co., Ltd. 166,162 — — — 16,325 2,820 — 185,307 Datang KEPCO Chaoyang Renewable Power Co., Ltd. 39,442 — — — 875 707 — 41,024 Rabigh Electricity Company 105,328 — — — 4,355 (1,734 ) 1,147 109,096 Rabigh Operation & Maintenance Company Limited 5,834 — — (2,222 ) 3,070 197 — 6,879 Jamaica Public Service Company Limited 239,632 — — (4,631 ) 10,166 8,440 — 253,607 KW Nuclear Components Co., Ltd. 7,708 — — (208 ) 1,552 — — 9,052 Busan Shinho Solar Power Co., Ltd. 4,761 — — (430 ) 714 — — 5,045 GS Donghae Electric Power Co., Ltd. 240,591 — — (10,200 ) 25,787 — (256,178 ) — Global Trade Of Power System Co., Ltd. 515 — — — 56 — — 571 Expressway Solar-light Power Generation Co., Ltd. 2,676 — — — 207 — — 2,883 Daejung Offshore Wind Power Co., Ltd. 2,669 — — — (308 ) — (2,361 ) — Amman Asia Electric Power Company 177,357 — — — 20,648 (5,841 ) — 192,164 KAPES, Inc. 9,079 — — — 1,767 — (14 ) 10,832 Dangjin Eco Power Co., Ltd. 19,912 — (5,359 ) — (657 ) 16 (13,912 ) — Honam Wind Power Co., Ltd. 4,860 — — (587 ) 102 — — 4,375 Jeongam Wind Power Co., Ltd. — — — — — — 4,437 4,437 Korea Power Engineering Service Co., Ltd. — — — — — — 4,902 4,902 Chun-cheon Energy Co., Ltd.(*3) 42,505 — — — (7,385 ) — (248 ) 34,872 Yeonggwangbaeksu Wind Power Co., Ltd. 2,843 — — — 197 — — 3,040 Nghi Son 2 Power LLC — — — — — — — — Kelar S.A 72,824 — — — 3,435 (8,416 ) 2,619 70,462 PT. Tanjung Power Indonesia 7,081 26,146 — — 5,601 (4,489 ) (12 ) 34,327 Incheon New Power Co., Ltd.(*4) 579 — — — (232 ) — (347 ) — Seokmun Energy Co., Ltd. 16,751 — — — 591 — — 17,342 Daehan Wind Power PSC ￦ 1,632 — — — 66 59 — 1,757 Barakah One Company 3,807 — — — (2,668 ) (1,139 ) — — Nawah Energy Company 274 — — — — 11 — 285 MOMENTUM 582 — — (411 ) 380 2 — 553 Daegu Green Power Co., Ltd.(*2) 41,110 — — — 3,599 — (21,885 ) 22,824 Yeonggwang Wind Power Co., Ltd. 15,304 2,100 — — 223 — — 17,627 Chester Solar IV SpA 1,851 — — — (1,746 ) (55 ) 622 672 Chester Solar V SpA 474 — — — (619 ) (6 ) 297 146 Diego de Almagro Solar SpA 1,663 — — — (1,014 ) (86 ) 472 1,035 South Jamaica Power Company Limited 16,124 4,290 — — (7,131 ) 580 — 13,863 Daesan Green Energy Co., Ltd. 17,433 — — — (251 ) — — 17,182 RE Holiday Holdings LLC 51,094 — — — (6,525 ) (2,500 ) 1 42,070 RE Pioneer Holdings LLC 38,898 — — (939 ) (5,507 ) (1,296 ) — 31,156 RE Barren Ridge 1 Holdings LLC 41,415 — — (1,152 ) 4,609 (1,957 ) 1 42,916 RE Astoria 2 LandCo LLC 5,410 — — (430 ) 430 192 — 5,602 RE Barren Ridge LandCo LLC 1,898 — — (194 ) 172 90 — 1,966 Laurel SpA 921 — — — (665 ) (82 ) 421 595 KIAMCO KOWEPO Bannerton Hold Co Pty Ltd 3,940 — — — (28 ) 112 — 4,024 Chile Solar JV SpA 36,865 — — — 842 (2,849 ) 1 34,859 Taebaek Gadeoksan Wind Power Co., Ltd. 8,508 — — — (651 ) (9 ) (2 ) 7,846 Cheong-Song Noraesan Wind Power Co., Ltd. 2,073 1,127 — — (153 ) (4 ) — 3,043 Chester Solar I SpA 1,181 — — — (112 ) (79 ) 167 1,157 Solar Philippines Calatagan Corporation 47,903 — — (4,633 ) 4,305 1,355 — 48,930 Saemangeum Solar Power Co., Ltd. — 10,000 — — (1,676 ) — — 8,324 Chungsongmeon BongSan wind power Co., Ltd. — 2,900 — — (136 ) — — 2,764 Jaeun Resident Wind Power Plant Co., Ltd — 2,494 — — (296 ) — — 2,198 DE Energia SpA — 8,364 — — 647 (346 ) — 8,665 Eumseong Natural Gas Power Co., Ltd. — — — — — — — — Dangjin Eco Power Co., Ltd. (newly) — 9,180 — — — — 16,481 25,661 Haemodum Solar Co., Ltd. — 2,940 — — — — — 2,940 Yangyang Wind Power Co., Ltd. — 10,800 — — — — — 10,800 HORUS SOLAR, S.A. DE C.V. — 3,403 — — — — — 3,403 RECURSOS SOLARES PV DE MEXICO II, S.A. DE C.V. — 672 — — — — — 672 SUNMEX RENOVABLES, S.A. DE C.V. — 222 — — — — — 222 Stavro Holding II AB — 5,524 — — (4 ) 122 (17 ) 5,625 1,813,525 90,162 (5,359 ) (79,601 ) 129,402 (22,189 ) (262,911 ) 1,663,029 ￦ 5,878,345 107,821 (5,359 ) (215,613 ) 166,820 17,010 (34,193 ) 5,914,831 (*1) It was determined that there is objective evidence of impairment due to prolonged operating losses. As a result, the Company recognized an impairment loss of ￦96 million in impairment loss on investments in associates and joint ventures for the year ended December 31, 2019. (*2) It was determined that there is objective evidence of impairment due to prolonged operating losses. As a result, the Company recognized an impairment loss of ￦21,827 million in impairment loss on investments in associates and joint ventures for the year ended December 31, 2019. (*3) It was determined that there is objective evidence of impairment due to prolonged operating losses. As a result, the Company recognized an impairment loss of ￦248 million in impairment loss on investments in associates and joint ventures for the year ended December 31, 2019. (*4) It was determined that there is objective evidence of impairment due to prolonged operating losses. As a result, the Company recognized an impairment loss of ￦347 million in impairment loss on investments in associates and joint ventures for the year ended December 31, 2019.
Summary of financial information of associates and joint ventures	Summary of financial information of associates and joint ventures as of and for the years ended December 31, 2018 and 2019 are as follows: 2018 Investees Total assets Total liabilities Sales Profit (loss) for the year In millions of won <Associates> Korea Gas Corporation(*1) ￦ 39,689,692 31,186,488 26,185,038 523,480 Korea Electric Power Industrial Development Co., Ltd. 144,425 69,123 325,694 9,987 YTN Co., Ltd. 286,964 98,682 132,382 1,587 Cheongna Energy Co., Ltd. 431,234 428,921 64,594 (11,110 ) Gangwon Wind Power Co., Ltd. 89,614 1,805 25,407 10,926 Hyundai Green Power Co., Ltd. 1,127,220 688,738 501,798 66,925 Korea Power Exchange 304,318 52,516 108,571 16,031 AMEC Partners Korea Ltd. 1,113 14 — (26 ) Hyundai Energy Co., Ltd. 470,818 527,590 101,998 (33,947 ) Ecollite Co., Ltd. 1,944 312 — (68 ) Taebaek Wind Power Co., Ltd. 36,986 14,325 8,233 2,170 Taeback Guinemi Wind Power Co., Ltd. 10,929 653 — (2,082 ) Pyeongchang Wind Power Co., Ltd. 82,038 60,362 12,615 4,249 Daeryun Power Co., Ltd. 798,569 510,358 62,252 (4,958 ) Changjuk Wind Power Co., Ltd. 33,148 6,194 7,929 3,291 KNH Solar Co., Ltd. 22,598 13,942 3,586 439 SPC Power Corporation 225,599 16,819 50,317 37,355 Gemeng International Energy Co., Ltd. 7,155,937 4,420,561 1,921,367 120,558 PT. Cirebon Electric Power 876,069 481,061 274,962 33,144 KNOC Nigerian East Oil Co., Ltd. 78,841 152,017 — (398 ) KNOC Nigerian West Oil Co., Ltd. 70,437 137,663 — (400 ) PT Wampu Electric Power ￦ 223,009 155,406 13,463 4,624 PT. Bayan Resources TBK 1,388,199 566,890 1,707,387 521,666 S-Power 825,354 588,022 551,378 (6,185 ) Pioneer Gas Power Limited 311,742 316,810 — (45,934 ) Eurasia Energy Holdings 572 1,020 — — Xe-Pian Xe-Namnoy 1,015,013 702,187 — (1,214 ) Hadong Mineral Fiber Co., Ltd. 203 231 — — Green Biomass Co., Ltd. 4,411 3,107 909 (1,057 ) PT. Mutiara Jawa 24,022 22,763 14,393 3,917 Samcheok Eco Materials Co., Ltd. 24,391 2,921 4,135 (1,836 ) Noeul Green Energy Co., Ltd. 147,886 120,249 58,686 19,453 Naepo Green Energy Co., Ltd. 93,194 76,190 6,459 (6,623 ) Goseong Green Energy Co., Ltd. 1,891,662 1,659,415 — (7,323 ) Gangneung Eco Power Co., Ltd. 813,938 651,621 — (4,194 ) Shin Pyeongtaek Power Co., Ltd. 674,100 511,582 — 682 Heang Bok Do Si Photovoltaic Power Co., Ltd. 2,630 1,915 455 52 Dongducheon Dream Power Co., Ltd. 1,512,510 1,244,178 828,430 (22,864 ) Jinbhuvish Power Generation Pvt. Ltd. 63,163 13,044 — — SE Green Energy Co., Ltd. 7,048 — — (230 ) Daegu Photovoltaic Co., Ltd. 16,828 9,923 3,695 1,645 Jeongam Wind Power Co., Ltd. 93,444 81,971 1,559 2,154 Korea Power Engineering Service Co., Ltd. 18,609 3,666 20,809 3,207 Busan Green Energy Co., Ltd. 195,227 151,995 77,011 17,370 Gunsan Bio Energy Co., Ltd. 8,990 20,660 — (4,420 ) Korea Electric Vehicle Charging Service 15,019 9,328 8,615 (1,056 ) Ulleungdo Natural Energy Co., Ltd. 17,134 1,625 — (5,855 ) Korea Nuclear Partners Co., Ltd. 615 12 80 (707 ) Tamra Offshore Wind Power Co., Ltd. 170,238 131,717 21,701 4,077 Korea Electric Power Corporation Fund 48,280 176 1,315 (649 ) Energy Infra Asset Management Co., Ltd. 7,225 507 5,757 2,193 Daegu clean Energy Co., Ltd. 389 328 — (190 ) YaksuESS Co., Ltd 7,525 5,944 2,094 1,259 Nepal Water & Energy Development Company Private Limited 55,453 4,249 — (984 ) Gwangyang Green Energy Co., Ltd. 29,234 23,293 — (2,831 ) PND solar., Ltd 42,283 39,297 1,094 (795 ) Hyundai Eco Energy Co., Ltd. 165,555 148,852 — (2,193 ) YeongGwang Yaksu Wind Electric. Co., Ltd 46,027 43,606 7,604 (493 ) <Joint ventures> KEPCO-Uhde Inc. ￦ 403 34 18 (139 ) Eco Biomass Energy Sdn. Bhd. — — — — Shuweihat Asia Power Investment B.V. 55,614 — — (187 ) Shuweihat Asia Operation & Maintenance Company 1,472 31 2,391 1,719 Waterbury Lake Uranium L.P. 55,933 64 — — ASM-BG 84,924 42,166 12,745 4,406 RES Technology AD 69,609 39,192 7,879 1,567 KV Holdings, Inc. 4,795 — 8 1,257 KEPCO SPC Power Corporation 312,093 35,091 184,046 59,543 Gansu Datang Yumen Wind Power Co., Ltd. 79,354 54,402 8,323 (2,046 ) Datang Chifeng Renewable Power Co., Ltd. 751,551 336,024 117,270 37,159 Datang KEPCO Chaoyang Renewable Power Co., Ltd. 190,951 92,347 18,824 2,557 Rabigh Electricity Company 2,448,690 2,003,050 274,184 38,789 Rabigh Operation & Maintenance Company Limited 26,172 11,587 26,387 7,173 Jamaica Public Service Company Limited 1,396,421 827,837 992,677 32,507 KW Nuclear Components Co., Ltd. 24,598 7,077 6,031 2,543 Busan Shinho Solar Power Co., Ltd. 45,538 26,494 7,901 3,018 GS Donghae Electric Power Co., Ltd. 2,259,129 1,551,509 787,425 58,976 Global Trade Of Power System Co., Ltd. 2,039 263 1,368 (134 ) Expressway Solar-light Power Generation Co., Ltd. 18,443 9,215 2,986 692 Daejung Offshore Wind Power Co., Ltd. 6,440 1,091 — (590 ) Amman Asia Electric Power Company 792,532 496,791 23,676 32,674 KAPES, Inc. 82,494 64,691 57,047 4,710 Dangjin Eco Power Co., Ltd. 51,125 260 — (111,789 ) Honam Wind Power Co., Ltd. 43,713 27,066 7,700 3,122 Chun-cheon Energy Co., Ltd. 666,050 523,904 320,950 (19,133 ) Yeonggwangbaeksu Wind Power Co., Ltd. 99,368 80,450 11,366 734 Nghi Son 2 Power LLC 477,947 561,266 144,381 8,979 Kelar S.A 626,206 518,135 87,507 8,587 PT. Tanjung Power Indonesia 505,551 485,321 109,029 9,717 Incheon New Power Co., Ltd. 6,559 4,563 2,687 3 Seokmun Energy Co., Ltd. 253,544 195,782 50,052 10,224 Daehan Wind Power PSC 33,081 29,817 — (1,799 ) Barakah One Company 21,480,187 21,459,035 — (3,062 ) Nawah Energy Company ￦ 70,386 68,864 — — MOMENTUM 7,476 5,730 16,933 520 Daegu Green Power Co., Ltd. 591,263 523,972 291,734 (4,424 ) Yeonggwang Wind Power Co., Ltd. 255,777 219,013 — (145 ) Chester Solar IV SpA 15,307 13,114 1,415 609 Chester Solar V SpA 4,759 4,324 298 (19 ) Diego de Almagro Solar SpA 21,317 19,399 78 (340 ) South Jamaica Power Company Limited 294,341 213,723 — (932 ) Daesan Green Energy Co., Ltd. 52,582 2,774 — (1,192 ) RE Holiday Holdings LLC 334,742 232,553 9,451 1,319 RE Pioneer Holdings LLC 252,512 174,717 12,364 6,544 RE Barren Ridge 1 Holdings LLC 221,304 138,473 10,567 8,625 RE Astoria 2 Land Co LLC 11,030 210 619 583 RE Barren Ridge Land Co LLC 3,881 84 248 230 Laurel SpA 5,475 4,572 — (369 ) KIAMCO KOWEPO Bannerton Hold Co Pty Ltd 31,958 173 — (222 ) Chile Solar JV SpA 73,740 10 73 8,906 Taebaek Gadeoksan Wind Power Co., Ltd. 18,766 499 — 18 Cheong-Song Noraesan Wind Power Co., Ltd. 8,221 24 — — Chester Solar I SpA 1,712 562 — (81 ) Solar Philippines Calatagan Corporation 121,650 51,219 16,689 8,732 (*1) The profit recognized for the years ended December 31, 2018 and 2019 are reduced by of the associate entity’s net income attributable to non-controlling 2019 Investees Total assets Total liabilities Sales Profit (loss) for the year In millions of won <Associates> Korea Gas Corporation(*1) ￦ 39,311,855 31,165,334 24,982,640 38,764 Korea Electric Power Industrial Development Co., Ltd. 186,434 98,872 306,026 17,467 YTN Co., Ltd. 281,699 96,211 127,782 (1,230 ) Cheongna Energy Co., Ltd. 383,034 383,288 68,626 (2,567 ) Gangwon Wind Power Co., Ltd. 83,528 1,674 24,116 9,380 Hyundai Green Power Co., Ltd. 1,086,738 658,279 507,653 26,222 Korea Power Exchange 315,683 54,926 107,034 8,268 Hyundai Energy Co., Ltd. 465,238 549,940 91,842 (27,882 ) Ecollite Co., Ltd. 1,838 304 — (97 ) Taebaek Wind Power Co., Ltd. 36,182 8,027 6,177 5,494 Taeback Guinemi Wind Power Co., Ltd. ￦ 35,061 24,847 349 (61 ) Pyeongchang Wind Power Co., Ltd. 79,756 56,248 10,713 2,010 Daeryun Power Co., Ltd. 802,546 512,757 163,129 1,836 Changjuk Wind Power Co., Ltd. 29,875 1,476 6,076 1,447 KNH Solar Co., Ltd. 20,465 11,641 3,377 278 SPC Power Corporation 250,544 22,459 63,218 39,876 Gemeng International Energy Co., Ltd. 6,758,957 4,785,740 2,024,730 95,435 PT. Cirebon Electric Power 852,457 403,639 277,370 39,581 KNOC Nigerian East Oil Co., Ltd. 58,402 134,361 — (182 ) KNOC Nigerian West Oil Co., Ltd. 54,275 124,086 — (180 ) PT Wampu Electric Power 222,266 158,451 18,165 (2,315 ) PT. Bayan Resources TBK 1,302,637 622,576 1,707,387 252,855 S-Power 805,622 566,025 576,554 2,319 Pioneer Gas Power Limited 309,059 367,399 — (54,501 ) Eurasia Energy Holdings 592 1,056 — — Xe-Pian Xe-Namnoy 1,194,125 898,023 6,731 (40,437 ) Hadong Mineral Fiber Co., Ltd. 203 231 — — Green Biomass Co., Ltd. 3,866 2,487 17 (925 ) PT. Mutiara Jawa 26,109 21,150 11,196 3,396 Samcheok Eco Materials Co., Ltd. 26,625 3,209 10,876 1,946 Noeul Green Energy Co., Ltd. 137,370 114,578 36,435 (4,810 ) Naepo Green Energy Co., Ltd. 77,070 99,345 6,572 (31,577 ) Goseong Green Energy Co., Ltd. 3,399,058 3,177,210 — (10,276 ) Gangneung Eco Power Co., Ltd. 1,362,692 1,204,202 — (3,830 ) Shin Pyeongtaek Power Co., Ltd. 981,387 807,107 119,162 11,847 Heang Bok Do Si Photovoltaic Power Co., Ltd. 2,483 1,722 454 47 Dongducheon Dream Power Co., Ltd. 1,474,224 1,206,478 689,414 2,849 Jinbhuvish Power Generation Pvt. Ltd. 64,111 13,240 — — Daejung Offshore Wind Power Co., Ltd. 6,181 1,450 — (617 ) GS Donghae Electric Power Co., Ltd. 2,301,774 1,548,883 688,055 75,842 Daegu Photovoltaic Co., Ltd. 15,486 8,385 3,639 1,442 Busan Green Energy Co., Ltd. 173,537 136,857 52,256 (6,496 ) Gunsan Bio Energy Co., Ltd. 10,614 28,062 — (5,777 ) Korea Electric Vehicle Charging Service 12,810 9,013 8,428 (1,841 ) Korea Nuclear Partners Co., Ltd. 928 375 1,441 (50 ) Korea Electric Power Corporation Fund 42,162 239 127 (5,430 ) Energy Infra Asset Management Co., Ltd. 8,712 721 5,118 1,415 Daegu clean Energy Co., Ltd. 371 323 — (14 ) YaksuESS Co., Ltd 7,325 5,551 1,191 363 Nepal Water & Energy Development Company Private Limited ￦ 78,309 26,783 — (1,380 ) Gwangyang Green Energy Co., Ltd. 28,816 24,164 — (1,007 ) PND solar., Ltd 40,941 37,526 6,908 1,665 Hyundai Eco Energy Co., Ltd. 209,395 190,622 13,343 1,306 YeongGwang Yaksu Wind Electric. Co., Ltd 46,488 45,594 6,511 (1,510 ) Green Energy Electricity Generation Co., Ltd. 33,937 36,060 — (5,923 ) Korea Energy Solutions Co., Ltd. 1,285 18 134 (233 ) ITR Co., Ltd. 376 214 167 (88 ) Structure test network Co., Ltd. 89 249 76 (72 ) Namjeongsusang Solar Power Operation Co., Ltd. 34,595 29,310 — (1,149 ) Indeck Niles Development, LLC 49,465 174 — (25,430 ) Indeck Niles Asset Management, LLC 271 9 1,513 753 Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1 14,559 15 59 44 Suwon New Power Co., Ltd. 2,000 — — — KPGE Inc. 984 — — (6 ) Gwangbaek Solar Power Investment Co., Ltd. 193,464 183,063 7,635 (355 ) Goduk Clean Energy Co., Ltd. 3,000 — — — <Joint ventures> KEPCO-Uhde Inc. 270 7 — (107 ) Shuweihat Asia Power Investment B.V. 37,389 5 — (159 ) Shuweihat Asia Operation & Maintenance Company 2,605 45 2,570 1,892 Waterbury Lake Uranium L.P. 61,548 4 — — ASM-BG 78,191 39,439 13,200 4,894 RES Technology AD 66,821 34,325 8,384 1,914 KV Holdings, Inc. 6,101 — 25 1,876 KEPCO SPC Power Corporation 308,274 22,643 187,867 64,152 Gansu Datang Yumen Wind Power Co., Ltd. 77,313 56,941 6,106 (5,175 ) Datang Chifeng Renewable Power Co., Ltd. 765,598 302,329 122,398 40,371 Datang KEPCO Chaoyang Renewable Power Co., Ltd. 189,157 86,596 23,910 2,188 Rabigh Electricity Company 2,538,719 2,100,347 208,514 1,567 Rabigh Operation & Maintenance Company Limited 36,121 18,923 23,777 7,203 Jamaica Public Service Company Limited 1,543,049 940,609 1,035,399 32,828 KW Nuclear Components Co., Ltd. 31,326 10,820 11,305 3,837 Busan Shinho Solar Power Co., Ltd. 42,318 22,137 7,843 2,856 Global Trade Of Power System Co., Ltd. ￦ 2,993 1,025 3,323 134 Expressway Solar-light Power Generation Co., Ltd. 17,653 7,712 2,991 709 Amman Asia Electric Power Company 821,997 501,723 23,866 34,424 KAPES, Inc. 124,396 103,158 93,831 3,465 Honam Wind Power Co., Ltd. 39,680 24,703 5,365 354 Jeongam Wind Power Co., Ltd. 94,134 83,041 11,644 2,005 Korea Power Engineering Service Co., Ltd. 19,052 2,150 12,284 1,749 Chun-cheon Energy Co., Ltd. 607,823 490,375 313,438 (24,490 ) Yeonggwangbaeksu Wind Power Co., Ltd. 99,552 79,322 11,739 1,342 Nghi Son 2 Power LLC 1,589,928 1,795,578 1,008,326 71,803 Kelar S.A 634,633 530,335 86,702 8,867 PT. Tanjung Power Indonesia 654,365 556,287 109,825 16,489 Incheon New Power Co., Ltd. 4,749 3,553 1,951 (800 ) Seokmun Energy Co., Ltd. 242,332 182,533 44,733 2,606 Daehan Wind Power PSC 89,904 86,390 — (767 ) Barakah One Company 24,330,632 24,546,421 — (112,114 ) Nawah Energy Company 120,987 119,405 — 3 MOMENTUM 8,904 7,245 21,171 1,099 Daegu Green Power Co., Ltd. 579,593 500,092 301,339 4,899 Yeonggwang Wind Power Co., Ltd. 262,610 225,361 24,256 (2,032 ) Chester Solar IV SpA 13,443 12,079 1,590 (1,057 ) Chester Solar V SpA 4,677 4,625 519 (402 ) Diego de Almagro Solar SpA 18,984 16,901 1,954 (1,104 ) South Jamaica Power Company Limited 364,347 295,029 7,224 (35,650 ) Daesan Green Energy Co., Ltd. 232,170 183,079 — (717 ) RE Holiday Holdings LLC 331,862 247,722 18,744 (345 ) RE Pioneer Holdings LLC 246,571 184,258 12,207 (1,912 ) RE Barren Ridge 1 Holdings LLC 209,850 124,017 10,384 7,630 RE Astoria 2 Land Co LLC 11,422 217 656 651 RE Barren Ridge Land Co LLC 4,019 87 262 260 Laurel SpA 12,979 12,076 961 (1,130 ) KIAMCO KOWEPO Bannerton Hold Co Pty Ltd 32,883 425 — (232 ) Chile Solar JV SpA 69,903 186 591 1,686 Taebaek Gadeoksan Wind Power Co., Ltd. 70,270 49,500 — (1,602 ) Cheong-Song Noraesan Wind Power Co., Ltd. 51,247 40,969 — (549 ) Chester Solar I SpA 7,859 5,842 — (204 ) Solar Philippines Calatagan Corporation 98,577 47,956 18,720 11,331 Saemangeum Solar Power Co., Ltd. 13,740 3,270 — (1,875 ) Chungsongmeon BongSan wind power Co., Ltd. ￦ 27,659 24,272 — (1,365 ) Jaeun Resident Wind Power Plant Co., Ltd 31,402 23,823 — (844 ) DE Energia SpA 64,959 50,971 1,254 (2,645 ) Dangjin Eco Power Co., Ltd. (newly) 99,907 25,436 107 (737 ) Haemodum Solar Co., Ltd. 7,237 1,237 — — Yangyang Wind Power Co., Ltd. 10,764 — — (11 ) HORUS SOLAR, S.A. DE C.V. 10,566 8,503 — (7 ) RECURSOS SOLARES PV DE MEXICO II, S.A. DE C.V. 3,848 2,885 — 22 SUNMEX RENOVABLES, S.A. DE C.V. 3,170 2,171 — 13 Stavro Holding II AB 28,141 13 — (18 ) (*1) The profit recognized for the years ended December 31, 2018 and 2019 are reduced by the associate entity’s net income attributable to non-controlling
Financial information of associates and joint ventures in consolidated financial statements	Financial information of associates and joint ventures reconciled to the Company’s investments in consolidated financial statements as of December 31, 2018 and 2019 are as follows: 2018 Investees Net assets Percentage Share in net assets Investment differential Intercompany transaction Others Book value In millions of won <Associates> Korea Gas Corporation ￦ 8,503,204 21.57 % 1,834,141 — — (132,293 ) 1,701,848 Korea Electric Power Industrial Development Co., Ltd. 75,302 29.00 % 21,838 — — — 21,838 YTN Co., Ltd. 188,282 21.43 % 40,346 — (6 ) (2 ) 40,338 Cheongna Energy Co., Ltd. 2,313 43.90 % 1,015 2,584 (134 ) — 3,465 Gangwon Wind Power Co., Ltd. 87,809 15.00 % 13,171 — — 49 13,220 Hyundai Green Power Co., Ltd. 438,482 29.00 % 127,160 — — — 127,160 Korea Power Exchange 251,802 100.00 % 251,802 — — — 251,802 AMEC Partners Korea Ltd. 1,099 19.00 % 209 — — — 209 Hyundai Energy Co., Ltd. (56,772 ) 46.30 % (26,285 ) — (996 ) 27,281 — Ecollite Co., Ltd. 1,632 36.10 % 589 — — (589 ) — Taebaek Wind Power Co., Ltd. 22,661 25.00 % 5,665 — — — 5,665 Taeback Guinemi Wind Power Co., Ltd. 10,276 25.00 % 2,569 — — — 2,569 Pyeongchang Wind Power Co., Ltd. 21,676 25.00 % 5,419 — — — 5,419 Daeryun Power Co., Ltd. 288,211 9.34 % 26,919 — — (820 ) 26,099 Changjuk Wind Power Co., Ltd. 26,954 30.00 % 8,086 — — — 8,086 KNH Solar Co., Ltd. 8,656 27.00 % 2,337 — — — 2,337 SPC Power Corporation 208,780 38.00 % 79,336 — — (21,778 ) 57,558 Gemeng International Energy Co., Ltd. 2,735,376 34.00 % 930,028 — — (283,018 ) 647,010 PT. Cirebon Electric Power 395,008 27.50 % 108,628 — — — 108,628 KNOC Nigerian East Oil Co., Ltd. ￦ (73,176 ) 14.63 % (10,706 ) — — 10,706 — KNOC Nigerian West Oil Co., Ltd. (67,226 ) 14.63 % (9,835 ) — — 9,835 — PT Wampu Electric Power 67,603 46.00 % 31,097 — — — 31,097 PT. Bayan Resources TBK 821,309 20.00 % 164,262 423,763 — (76,379 ) 511,646 S-Power 237,332 49.00 % 116,293 — (1,727 ) — 114,566 Pioneer Gas Power Limited (5,068 ) 38.50 % (1,951 ) 22,278 — 68 20,395 Eurasia Energy Holdings (448 ) 40.00 % (179 ) — — 179 — Xe-Pian Xe-Namnoy 312,826 25.00 % 78,207 253 (1,006 ) (289 ) 77,165 Hadong Mineral Fiber Co., Ltd. (28 ) 8.33 % (2 ) — — 2 — Green Biomass Co., Ltd. 1,304 8.80 % 115 — — — 115 PT. Mutiara Jawa 1,259 29.00 % 365 — — — 365 Samcheok Eco Materials Co., Ltd. 21,470 2.35 % 505 — — (505 ) — Noeul Green Energy Co., Ltd. 27,637 29.00 % 8,015 — — — 8,015 Naepo Green Energy Co., Ltd. 17,004 41.67 % 7,085 — — (7,085 ) — Goseong Green Energy Co., Ltd. 232,247 1.12 % 2,590 — (131 ) — 2,459 Gangneung Eco Power Co., Ltd. 162,317 1.61 % 2,615 — (120 ) — 2,495 Shin Pyeongtaek Power Co., Ltd. 162,518 40.00 % 65,007 12,800 (10,207 ) — 67,600 Heang Bok Do Si Photovoltaic Power Co., Ltd. 715 28.00 % 200 — — 2 202 Dongducheon Dream Power Co., Ltd. 268,332 34.01 % 91,260 1,757 (4,049 ) (12,582 ) 76,386 Jinbhuvish Power Generation Pvt. Ltd. 50,119 5.16 % 2,586 — — (2,586 ) — SE Green Energy Co., Ltd. 7,048 47.76 % 3,366 — — — 3,366 Daegu Photovoltaic Co., Ltd. 6,905 29.00 % 2,002 — — — 2,002 Jeongam Wind Power Co., Ltd. 11,473 40.00 % 4,589 — — — 4,589 Korea Power Engineering Service Co., Ltd. 14,943 29.00 % 4,333 — — — 4,333 Busan Green Energy Co., Ltd. 43,232 29.00 % 12,537 — — — 12,537 Gunsan Bio Energy Co., Ltd. (11,670 ) 18.87 % (2,202 ) — — 2,202 — Korea Electric Vehicle Charging Service 5,691 28.00 % 1,593 — — — 1,593 Ulleungdo Natural Energy Co., Ltd. 15,509 29.85 % 4,629 — — (1 ) 4,628 Korea Nuclear Partners Co., Ltd. 603 29.00 % 175 — — — 175 Tamra Offshore Wind Power Co., Ltd. 38,521 27.00 % 10,401 — — — 10,401 Korea Electric Power Corporation Fund 48,104 98.09 % 47,185 — — 4 47,189 Energy Infra Asset Management Co., Ltd. 6,718 9.90 % 665 — — — 665 Daegu clean Energy Co., Ltd. 61 28.00 % 17 — — — 17 YaksuESS Co., Ltd 1,581 29.00 % 458 — — 2 460 Nepal Water & Energy Development Company Private Limited 51,204 57.67 % 29,529 972 — 460 30,961 Gwangyang Green Energy Co., Ltd. 5,941 20.00 % 1,188 18 — — 1,206 PND solar., Ltd 2,986 29.00 % 866 154 — — 1,020 Hyundai Eco Energy Co., Ltd. 16,703 19.00 % 3,174 214 — — 3,388 YeongGwang Yaksu Wind Electric. Co., Ltd 2,421 9.63 % 233 300 — — 533 <Joint ventures> KEPCO-Uhde Inc. 369 50.85 % 188 — — — 188 Eco Biomass Energy Sdn. Bhd. — 61.53 % — — — — — Shuweihat Asia Power Investment B.V. ￦ 55,614 49.00 % 27,251 — — — 27,251 Shuweihat Asia Operation & Maintenance Company 1,441 55.00 % 793 — — (1 ) 792 Waterbury Lake Uranium L.P. 55,869 34.07 % 19,032 — — — 19,032 ASM-BG 42,758 50.00 % 21,379 — — — 21,379 RES Technology AD 30,417 50.00 % 15,209 — — — 15,209 KV Holdings, Inc. 4,795 40.00 % 1,918 — — — 1,918 KEPCO SPC Power Corporation 277,002 75.20 % 208,306 — — — 208,306 Gansu Datang Yumen Wind Power Co., Ltd. 24,952 40.00 % 9,981 — — — 9,981 Datang Chifeng Renewable Power Co., Ltd. 415,527 40.00 % 166,211 — — (49 ) 166,162 Datang KEPCO Chaoyang Renewable Power Co., Ltd. 98,604 40.00 % 39,442 — — — 39,442 Rabigh Electricity Company 445,640 40.00 % 178,256 — (70,977 ) (1,951 ) 105,328 Rabigh Operation & Maintenance Company Limited 14,585 40.00 % 5,834 — — — 5,834 Jamaica Public Service Company Limited 568,584 40.00 % 227,434 (80,161 ) — 92,359 239,632 KW Nuclear Components Co., Ltd. 17,521 45.00 % 7,884 — — (176 ) 7,708 Busan Shinho Solar Power Co., Ltd. 19,044 25.00 % 4,761 — — — 4,761 GS Donghae Electric Power Co., Ltd. 707,620 34.00 % 240,591 — — — 240,591 Global Trade Of Power System Co., Ltd. 1,776 29.00 % 515 — — — 515 Expressway Solar-light Power Generation Co., Ltd. 9,228 29.00 % 2,676 — — — 2,676 Daejung Offshore Wind Power Co., Ltd. 5,349 49.90 % 2,669 — — — 2,669 Amman Asia Electric Power Company 295,741 60.00 % 177,445 — — (88 ) 177,357 KAPES, Inc. 17,803 51.00 % 9,079 — — — 9,079 Dangjin Eco Power Co., Ltd. 50,865 34.00 % 17,294 2,618 — — 19,912 Honam Wind Power Co., Ltd. 16,647 29.00 % 4,828 32 — — 4,860 Chun-cheon Energy Co., Ltd. 142,146 29.90 % 42,502 3 — — 42,505 Yeonggwangbaeksu Wind Power Co., Ltd. 18,918 15.00 % 2,837 6 — — 2,843 Nghi Son 2 Power LLC (83,319 ) 50.00 % (41,660 ) — — 41,660 — Kelar S.A 108,071 65.00 % 70,246 2,470 — 108 72,824 PT. Tanjung Power Indonesia 20,230 35.00 % 7,081 — — — 7,081 Incheon New Power Co., Ltd. 1,996 29.00 % 579 — — — 579 Seokmun Energy Co., Ltd. 57,762 29.00 % 16,751 — — — 16,751 Daehan Wind Power PSC 3,264 50.00 % 1,632 — — — 1,632 Barakah One Company 21,152 18.00 % 3,807 — — — 3,807 Nawah Energy Company 1,522 18.00 % 274 — — — 274 MOMENTUM 1,746 33.33 % 582 — — — 582 Daegu Green Power Co., Ltd. 67,291 29.00 % 19,514 84 — 21,512 41,110 Yeonggwang Wind Power Co., Ltd. 36,764 41.00 % 15,074 230 — — 15,304 Chester Solar IV SpA 2,193 81.82 % 1,794 57 — — 1,851 Chester Solar V SpA 435 81.82 % 356 118 — — 474 Diego de Almagro Solar SpA 1,918 81.82 % 1,569 94 — — 1,663 South Jamaica Power Company Limited ￦ 80,618 20.00 % 16,124 — — — 16,124 Daesan Green Energy Co., Ltd. 49,808 35.00 % 17,433 — — — 17,433 RE Holiday Holdings LLC 102,189 50.00 % 51,094 — — — 51,094 RE Pioneer Holdings LLC 77,795 50.00 % 38,898 — — — 38,898 RE Barren Ridge 1 Holdings LLC 82,831 50.00 % 41,415 — — — 41,415 RE Astoria 2 LandCo LLC 10,820 50.00 % 5,410 — — — 5,410 RE Barren Ridge LandCo LLC 3,797 50.00 % 1,898 — — — 1,898 Laurel SpA 903 81.82 % 739 182 — — 921 KIAMCO KOWEPO Bannerton Hold Co Pty Ltd 31,785 12.37 % 3,931 9 — — 3,940 Chile Solar JV SpA 73,730 50.00 % 36,865 — — — 36,865 Taebaek Gadeoksan Wind Power Co., Ltd. 18,267 46.58 % 8,508 — — — 8,508 Cheong-Song Noraesan Wind Power Co., Ltd. 8,197 24.76 % 2,029 44 — — 2,073 Chester Solar I SpA 1,150 81.82 % 940 241 — — 1,181 Solar Philippines Calatagan Corporation 70,431 38.00 % 26,764 21,139 — — 47,903 (*) The percentage of ownership shown above is after considering the treasury stocks and others. 2019 Investees Net assets Percentage of Share in net Investment differential Intercompany transaction Others Book value In millions of won <Associates> Korea Gas Corporation ￦ 8,146,521 21.57 % 1,757,205 — — (63,238 ) 1,693,967 Korea Electric Power Industrial Development Co., Ltd. 87,562 29.00 % 25,393 — — — 25,393 YTN Co., Ltd. 185,488 21.43 % 39,747 — — — 39,747 Cheongna Energy Co., Ltd. (254 ) 43.90 % (112 ) 2,584 (1,061 ) — 1,411 Gangwon Wind Power Co., Ltd. 81,854 15.00 % 12,278 49 — — 12,327 Hyundai Green Power Co., Ltd. 428,459 29.00 % 124,253 — — — 124,253 Korea Power Exchange 260,757 100.00 % 260,757 — — (1,858 ) 258,899 Hyundai Energy Co., Ltd. (84,702 ) 46.30 % (39,217 ) — (954 ) 40,171 — Ecollite Co., Ltd. 1,534 36.10 % 554 — — (554 ) — Taebaek Wind Power Co., Ltd. 28,155 25.00 % 7,039 — — — 7,039 Taeback Guinemi Wind Power Co., Ltd. 10,214 25.00 % 2,553 — — — 2,553 Pyeongchang Wind Power Co., Ltd. 23,508 25.00 % 5,877 — — — 5,877 Daeryun Power Co., Ltd. 289,789 9.34 % 27,066 — — (819 ) 26,247 Changjuk Wind Power Co., Ltd. 28,399 30.00 % 8,520 — — — 8,520 KNH Solar Co., Ltd. 8,824 27.00 % 2,382 — — — 2,382 SPC Power Corporation 228,085 38.00 % 86,672 — — (23,089 ) 63,583 Gemeng International Energy Co., Ltd. 1,973,217 34.00 % 670,896 — — — 670,896 PT. Cirebon Electric Power 448,818 27.50 % 123,425 — — — 123,425 KNOC Nigerian East Oil Co., Ltd. (75,959 ) 14.63 % (11,113 ) — — 11,113 — KNOC Nigerian West Oil Co., Ltd. (69,811 ) 14.63 % (10,213 ) — — 10,213 — PT Wampu Electric Power 63,815 46.00 % 29,355 — — — 29,355 PT. Bayan Resources TBK ￦ 680,061 20.00 % 136,012 385,508 — (76,379 ) 445,141 S-Power 239,597 49.00 % 117,403 — (1,619 ) — 115,784 Pioneer Gas Power Limited (58,340 ) 38.50 % (22,459 ) 22,278 — 181 — Eurasia Energy Holdings (464 ) 40.00 % (186 ) — — 186 — Xe-Pian Xe-Namnoy 296,102 25.00 % 74,026 305 (1,106 ) (290 ) 72,935 Hadong Mineral Fiber Co., Ltd. (28 ) 8.33 % (2 ) — — 2 — Green Biomass Co., Ltd. 1,379 7.85 % 108 — — — 108 PT. Mutiara Jawa 4,959 29.00 % 1,438 — — — 1,438 Samcheok Eco Materials Co., Ltd. 23,416 25.54 % 5,980 — — (5,980 ) — Noeul Green Energy Co., Ltd. 22,792 29.00 % 6,610 — — — 6,610 Naepo Green Energy Co., Ltd. (22,275 ) 41.67 % (9,281 ) 2 — 9,279 — Goseong Green Energy Co., Ltd. 221,848 1.12 % 2,474 — (134 ) — 2,340 Gangneung Eco Power Co., Ltd. 158,490 1.61 % 2,553 — (123 ) — 2,430 Shin Pyeongtaek Power Co., Ltd. 174,280 40.00 % 69,712 12,800 (15,556 ) — 66,956 Heang Bok Do Si Photovoltaic Power Co., Ltd. 761 28.00 % 213 — — 2 215 Dongducheon Dream Power Co., Ltd. 267,746 34.01 % 91,060 1,757 (3,688 ) (12,582 ) 76,547 Jinbhuvish Power Generation Pvt. Ltd. 50,871 5.16 % 2,625 — — (2,625 ) — Daejung Offshore Wind Power Co., Ltd. 4,731 49.90 % 2,361 — — — 2,361 GS Donghae Electric Power Co., Ltd. 752,891 34.00 % 255,983 — — — 255,983 Daegu Photovoltaic Co., Ltd. 7,101 29.00 % 2,060 — — — 2,060 Busan Green Energy Co., Ltd. 36,680 29.00 % 10,637 — — — 10,637 Gunsan Bio Energy Co., Ltd. (17,448 ) 18.87 % (3,292 ) — — 3,292 — Korea Electric Vehicle Charging Service 3,797 28.00 % 1,063 — — — 1,063 Korea Nuclear Partners Co., Ltd. 553 29.00 % 160 — — (160 ) — Korea Electric Power Corporation Fund 41,923 98.09 % 41,122 — — 4 41,126 Energy Infra Asset Management Co., Ltd. 7,991 9.90 % 791 — — — 791 Daegu clean Energy Co., Ltd. 48 28.00 % 13 — — — 13 YaksuESS Co., Ltd 1,774 29.00 % 514 2 — — 516 Nepal Water & Energy Development Company Private Limited 51,526 58.59 % 30,173 972 — — 31,145 Gwangyang Green Energy Co., Ltd. 4,652 20.00 % 930 18 — — 948 PND solar., Ltd 3,415 29.00 % 990 154 — — 1,144 Hyundai Eco Energy Co., Ltd. 18,773 19.00 % 3,567 214 — — 3,781 YeongGwang Yaksu Wind Electric. Co., Ltd 894 9.63 % 86 300 — — 386 Green Energy Electricity Generation Co., Ltd. (2,123 ) 29.00 % (616 ) 779 — — 163 Korea Energy Solutions Co., Ltd. 1,267 20.00 % 253 6 — — 259 ITR Co., Ltd. 162 20.00 % 32 1 — — 33 Structure test network Co., Ltd. (160 ) 20.00 % (32 ) 53 — — 21 Namjeongsusang Solar Power Operation Co., Ltd. 5,285 15.00 % 793 19 — — 812 Indeck Niles Development, LLC 49,291 50.00 % 24,646 — — (24,646 ) — Indeck Niles Asset Management, LLC 262 33.33 % 87 — — — 87 Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1 14,544 49.00 % 7,126 — — — 7,126 Suwon New Power Co., Ltd. 2,000 33.10 % 662 — — 136 798 KPGE Inc. 984 29.00 % 285 — — 2 287 Gwangbaek Solar Power Investment Co., Ltd. 10,401 19.00 % 1,976 78 — — 2,054 Goduk Clean Energy Co., Ltd. 3,000 61.00 % 1,830 — — — 1,830 <Joint ventures> KEPCO-Uhde Inc. ￦ 263 50.80 % 134 — — — 134 Shuweihat Asia Power Investment B.V. 37,384 49.00 % 18,318 — — — 18,318 Shuweihat Asia Operation & Maintenance Company 2,560 55.00 % 1,408 — — — 1,408 Waterbury Lake Uranium L.P. 61,544 33.41 % 20,562 — — — 20,562 ASM-BG 38,752 50.00 % 19,376 — — — 19,376 RES Technology AD 32,496 50.00 % 16,248 — — — 16,248 KV Holdings, Inc. 6,101 40.00 % 2,441 — — — 2,441 KEPCO SPC Power Corporation 285,631 75.20 % 214,794 — — — 214,794 Gansu Datang Yumen Wind Power Co., Ltd. 20,372 40.00 % 8,149 — — — 8,149 Datang Chifeng Renewable Power Co., Ltd. 463,269 40.00 % 185,307 — — — 185,307 Datang KEPCO Chaoyang Renewable Power Co., Ltd. 102,561 40.00 % 41,024 — — — 41,024 Rabigh Electricity Company 438,372 40.00 % 175,349 — (65,450 ) (803 ) 109,096 Rabigh Operation & Maintenance Company Limited 17,198 40.00 % 6,879 — — — 6,879 Jamaica Public Service Company Limited 602,440 40.00 % 240,976 (80,161 ) — 92,792 253,607 KW Nuclear Components Co., Ltd. 20,506 45.00 % 9,228 — — (176 ) 9,052 Busan Shinho Solar Power Co., Ltd. 20,181 25.00 % 5,045 — — — 5,045 Global Trade Of Power System Co., Ltd. 1,968 29.00 % 571 — — — 571 Expressway Solar-light Power Generation Co., Ltd. 9,941 29.00 % 2,883 — — — 2,883 Amman Asia Electric Power Company 320,274 60.00 % 192,164 — — — 192,164 KAPES, Inc. 21,238 51.00 % 10,832 — — — 10,832 Honam Wind Power Co., Ltd. 14,977 29.00 % 4,343 32 — — 4,375 Jeongam Wind Power Co., Ltd. 11,093 40.00 % 4,437 — — — 4,437 Korea Power Engineering Service Co., Ltd. 16,902 29.00 % 4,902 — — — 4,902 Chun-cheon Energy Co., Ltd. 117,448 29.90 % 35,117 — — (245 ) 34,872 Yeonggwangbaeksu Wind Power Co., Ltd. 20,230 15.00 % 3,035 5 — — 3,040 Nghi Son 2 Power LLC (205,650 ) 50.00 % (102,825 ) — — 102,825 — Kelar S.A 104,298 65.00 % 67,794 2,668 — — 70,462 PT. Tanjung Power Indonesia 98,078 35.00 % 34,327 — — — 34,327 Incheon New Power Co., Ltd. 1,196 29.00 % 347 — — (347 ) — Seokmun Energy Co., Ltd. 59,799 29.00 % 17,342 — — — 17,342 Daehan Wind Power PSC 3,514 50.00 % 1,757 — — — 1,757 Barakah One Company (215,789 ) 18.00 % (38,842 ) — (77,254 ) 116,096 — Nawah Energy Company 1,582 18.00 % 285 — — — 285 MOMENTUM 1,659 33.33 % 553 — — — 553 Daegu Green Power Co., Ltd. 79,501 54.24 % 43,124 84 — (20,384 ) 22,824 Yeonggwang Wind Power Co., Ltd. 37,249 46.00 % 17,135 492 — — 17,627 Chester Solar IV SpA 1,364 45.00 % 614 58 — — 672 Chester Solar V SpA 52 45.00 % 23 123 — — 146 Diego de Almagro Solar SpA 2,083 45.00 % 937 98 — — 1,035 South Jamaica Power Company Limited 69,318 20.00 % 13,863 — — — 13,863 Daesan Green Energy Co., Ltd. 49,091 35.00 % 17,182 — — — 17,182 RE Holiday Holdings LLC 84,140 50.00 % 42,070 — — — 42,070 RE Pioneer Holdings LLC 62,313 50.00 % 31,156 — — — 31,156 RE Barren Ridge 1 Holdings LLC ￦ 85,833 50.00 % 42,916 — — — 42,916 RE Astoria 2 LandCo LLC 11,205 50.00 % 5,602 — — — 5,602 RE Barren Ridge LandCo LLC 3,932 50.00 % 1,966 — — — 1,966 Laurel SpA 903 45.00 % 406 189 — — 595 KIAMCO KOWEPO Bannerton Hold Co Pty Ltd 32,458 12.37 % 4,015 9 — — 4,024 Chile Solar JV SpA 69,717 50.00 % 34,859 — — — 34,859 Taebaek Gadeoksan Wind Power Co., Ltd. 20,770 37.78 % 7,846 — — — 7,846 Cheong-Song Noraesan Wind Power Co., Ltd. 10,278 29.01 % 2,982 61 — — 3,043 Chester Solar I SpA 2,017 45.00 % 908 249 — — 1,157 Solar Philippines Calatagan Corporation 50,621 38.00 % 19,236 29,694 — — 48,930 Saemangeum Solar Power Co., Ltd. 10,470 81.00 % 8,481 — — (157 ) 8,324 Chungsongmeon BongSan wind power Co., Ltd. 3,387 29.00 % 982 1,782 — — 2,764 Jaeun Resident Wind Power Plant Co., Ltd 7,579 29.00 % 2,198 — — — 2,198 DE Energia SpA 13,988 49.00 % 6,854 — — 1,811 8,665 Dangjin Eco Power Co., Ltd. (newly) 74,471 34.00 % 25,320 341 — — 25,661 Haemodum Solar Co., Ltd. 6,000 49.00 % 2,940 — — — 2,940 Yangyang Wind Power Co., Ltd. 10,764 99.54 % 10,714 86 — — 10,800 HORUS SOLAR, S.A. DE C.V. 2,063 14.95 % 308 3,095 — — 3,403 RECURSOS SOLARES PV DE MEXICO II, S.A. DE C.V. 963 14.95 % 144 528 — — 672 SUNMEX RENOVABLES, S.A. DE C.V. 999 14.95 % 149 73 — — 222 Stavro Holding II AB 28,128 20.00 % 5,625 — — — 5,625 (*) The percentage of ownership shown above is after considering the treasury stocks and others.
Unrecognized equity interest in investments in associates and joint ventures	As of December 31, 2018, and 2019, unrecognized equity interest in investments in associates and joint ventures whose book value has been reduced to zero due to accumulated losses are as follows: 2018 2019 Unrecognized Accumulated unrecognized Unrecognized Accumulated unrecognized In millions of won Hadong Mineral Fiber Co., Ltd. ￦ — 2 — 2 PT. Mutiara Jawa (746 ) — — — Eurasia Energy Holdings 7 179 6 185 Gunsan Bio Energy Co., Ltd. 916 2,202 1,090 3,292 Daehan Wind Power PSC (412 ) — — — Hyundai Energy Co., Ltd. 25,841 25,841 12,890 38,731 Nghi Son 2 Power LLC 41,659 41,659 61,165 102,824 Samcheok Eco Materials Co., Ltd. 1,285 1,285 (497 ) 788 Naepo Green Energy Co., Ltd. — — 9,281 9,281 Barakah One Company — — 116,096 116,096 Pioneer Gas Power Limited — — 114 114
Shareholders' agreements on investments in associates and joint ventures	As of December 31, 2019, shareholders’ agreements on investments in associates and joint ventures that may cause future economic resource or cash outflows are as follows: (i) Gemeng International Energy Co., Ltd. Gemeng International Energy Co., Ltd. issued put options on 8% of its shares to its financial investors, KEPCO Woori Sprott PEF (NPS Co-Pa (ii) Hyundai Energy Co., Ltd. The Company had placed guarantees for a fixed return on the investment to NH Power II Co., Ltd. and National Agricultural Cooperative Federation (“NACF”) and had obtained the rights to acquire the investment securities in return preferentially. In addition, NH Power II Co., Ltd. and NACF have a right, which can be exercised for 30 days starting from 2 months to 1 month prior to 17 years after the termination date of the contract to sell their shares to the Company. (iii) Taebaek Wind Power Co., Ltd. In the case where non-controlling (iv) Pyeongchang Wind Power Co., Ltd. In the case where non-controlling (v) Jeongam Wind Power Co., Ltd. In the case where non-controlling (vi) Daegu Green Power Co., Ltd. The Company has a right to purchase all the shares of Daegu Green Power Co., Ltd. held by the financial investors at the yield-based transfer amount agreed with the shareholders.The Company can exercise its right 5, 10 and 13 years after the date of the investment. The Company has a right to purchase all or part of the shares of Daegu Green Power Co., Ltd. held by Lotte Engineering & Construction Co. at the yield-based transfer amount agreed with the shareholders. (vii) Taebaek Guinemi Wind Power Co., Ltd. At the commencement of the operation of the facility, the Company has a right to purchase all or part of the shares from the shareholders at fair value. (viii) Hyundai Green Power Co., Ltd. As of December 31, 2019, Hyundai Green Power Co., Ltd., an associate of the Company, which engages in the byproduct gas power generating business, entered into a project financing agreement with a limit of ￦919.2 billion with Korea Development Bank and others. At a certain period in the future, the Company has call option against the financial investors (Korea Development Bank and others) and also has an obligation to purchase its shares when claimed by the financial investors. At a certain period in the future, the Company has put option against Hyundai Steel Company and a third party designated by Hyundai Steel Company (collectively, “Hyundai Steel Company”), the operating investor of Hyundai Green Power Co., Ltd., according to the conditions of the agreement and also has an obligation to sell its shares upon request from Hyundai Steel Company. (ix) YeongGwang Yaksu Wind Electric. Co., Ltd. As of December 31, 2019, YeongGwang Yaksu Wind Electric. Co., Ltd., an associate of the Company, which engages in the wind power generating business in YeongGwang, Jeonra-namdo, and entered into a project financing agreement with a limit of ￦46 billion IBK and others. The Company set the shares of YeongGwang Yaksu Wind Electric. Co., Ltd. as a collateral for the project financing to the lenders. (x) Yeonggwang Wind Power Co., Ltd. In case the Company intends to purchase all or part of the shares from Daehan Green Energy Co., Ltd., which is a non-controlling (xi) Chester Solar I SpA According to the shareholders’ agreement, the Company has an obligation to purchase the shares at the agreed yield-based transfer price on the agreed date of exercise. According to the shareholders’ agreement, when Sprott Chile SolarISpA intends to sell its shares. (xii) Chester Solar IV SpA According to the shareholders’ agreement, the Company has an obligation to purchase the shares at the agreed yield-based transfer price on the agreed date of exercise. According to the shareholders’ agreement, when Sprott Chile SolarISpA intends to sell its shares. (xiii) Chester Solar V SpA According to the shareholders’ agreement, the Company has an obligation to purchase the shares at the agreed yield-based transfer price on the agreed date of exercise. According to the shareholders’ agreement, when Sprott Chile SolarISpA intends to sell its shares. (xiv) Diego de Almagro Solar SpA According to the shareholders’ agreement, the Company has an obligation to purchase the shares at the agreed yield-based transfer price on the agreed date of exercise. According to the shareholders’ agreement, when Sprott Chile SolarISpA intends to sell its shares. (xv) Laurel SpA According to the shareholders’ agreement, the Company has an obligation to purchase the shares at the agreed yield-based transfer price on the agreed date of exercise. According to the shareholders’ agreement, when Sprott Chile Solar I SpA intends to sell its shares.
Significant restrictions on its abilities to associates or joint ventures	Significant restrictions on the Company’s abilities on associates or joint ventures are as follows: Company Nature and extent of any significant restrictions Daegu Green Power Co., Ltd. Dividends can only be paid when all conditions of the loan agreement are satisfied, or prior written consent of financial institutions is obtained. Shares cannot be wholly or partially transferred without prior written consent of financial institutions is obtained. Taebaek Wind Power Co., Ltd. Financial institutions can reject or defer an approval with regard to the request for fund executions on subordinated loans of shareholders in order to pay senior loans based on the loan agreement. Dividends can only be paid when all conditions of the loan agreement are satisfied, or prior written consent of financial institutions is obtained. Shares cannot be wholly or partially transferred without prior written consent of financial institutions is obtained. Pyeongchang Wind Power Co., Ltd. Principals on subordinated loans or dividends can only be paid when all conditions of the loan agreement are satisfied, or prior written consent of financial institutions is obtained. Shares cannot be wholly or partially transferred without prior written consent of financial institutions is obtained. Daeryun Power Co., Ltd. Principals on subordinated loans or dividends can only be paid when all conditions of the loan agreement are satisfied, or prior written consent of financial institutions is obtained and Shares cannot be wholly or partially transferred without consent of the majority of lenders is obtained. KNH Solar Co., Ltd. Principal and interest, dividends to shareholders cannot be paid without written consent of financial institutions. Also, Shares cannot be wholly or partially transferred without consent of other shareholders is obtained. Jeongam Wind Power Co., Ltd. Dividends can only be paid when all conditions of the loan agreement are satisfied and reimbursement to the lender can be restricted depending on the priority of the loans. Also, Shares cannot be wholly or partially transferred without consent of the stakeholders is obtained. Korea Power Engineering Service Co., Ltd. Shares cannot be wholly or partially transferred without consent of the board of directors is obtained. Daehan Wind Power PSC Dividends can only be paid when all conditions of the loan agreement are satisfied. Also, Shares cannot be wholly or partially transferred without consent of the stakeholders is obtained. Daejung Offshore Wind Power Co., Ltd. Before the commencement of the operation, shares cannot be wholly or partially transferred without consent of the stakeholders is obtained. Naepo Green Energy Co., Ltd. Shares cannot be wholly or partially transferred without consent of the stakeholders is obtained. Samcheok Eco Materials Co., Ltd. Dividends can only be paid when all conditions of the shareholder’s agreement are satisfied. Also, shares cannot be wholly or partially transferred without consent of the stakeholders is obtained. KPGE Inc. Shares cannot be wholly or partially transferred without consent of the stakeholders is obtained. Taebaek Guinemi Wind Power Co., Ltd. Dividends can only be paid when all conditions of the shareholder’s agreement are satisfied. Also, shares cannot be wholly or partially transferred without consent of the stakeholders is obtained. Indeck Niles Asset Management, LLC Shares cannot be wholly or partially transferred without consent of the stakeholders is obtained. Indeck Niles Development, LLC Shares cannot be wholly or partially transferred without consent of the stakeholders is obtained. Chester Solar IV SpA Shares cannot be wholly or partially transferred without consent of the stakeholders is obtained. Chester Solar V SpA Shares cannot be wholly or partially transferred without consent of the stakeholders is obtained. Diego de Almagro Solar Spa Shares cannot be wholly or partially transferred without consent of the stakeholders is obtained. Laurel SpA Shares cannot be wholly or partially transferred without consent of the stakeholders is obtained. Kelar S.A. Dividends can only be paid when all conditions of the loan agreement are satisfied. Also, Shares cannot be wholly or partially transferred without consent of the stakeholders is obtained.

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	2018 Acquisition cost Government grants Accumulated depreciation Accumulated losses Book value In millions of won Land ￦ 13,554,292 (21,968 ) — — 13,532,324 Buildings 19,431,536 (63,189 ) (7,494,176 ) (3,669 ) 11,870,502 Structures 66,335,506 (190,854 ) (23,615,312 ) (8,399 ) 42,520,941 Machinery 82,047,823 (173,242 ) (34,151,878 ) (439,350 ) 47,283,353 Ships 3,655 — (3,353 ) — 302 Vehicles 287,954 (4,220 ) (215,649 ) (116 ) 67,969 Equipment 1,558,309 (418 ) (1,175,408 ) (42 ) 382,441 Tools 1,073,145 (675 ) (880,432 ) (38 ) 192,000 Construction-in- 29,026,880 (54,740 ) — (205,713 ) 28,766,427 Finance lease assets 2,390,701 (26 ) (2,194,971 ) — 195,704 Asset retirement costs 9,424,181 — (3,706,004 ) (146,423 ) 5,571,754 Others 11,875,394 — (9,515,917 ) — 2,359,477 ￦ 237,009,376 (509,332 ) (82,953,100 ) (803,750 ) 152,743,194 2019 Acquisition cost Government grants Accumulated depreciation Accumulated losses Book value In millions of won Land ￦ 13,848,063 (21,817 ) — — 13,826,246 Buildings 20,756,351 (61,920 ) (8,305,683 ) (4,962 ) 12,383,786 Structures 70,900,343 (186,554 ) (25,711,840 ) (9,633 ) 44,992,316 Machinery 89,224,339 (158,907 ) (38,865,392 ) (451,647 ) 49,748,393 Ships 3,104 — (2,903 ) — 201 Vehicles 309,829 (2,275 ) (239,128 ) (116 ) 68,310 Equipment 1,716,210 (241 ) (1,342,053 ) (42 ) 373,874 Tools 1,098,127 (403 ) (934,023 ) (40 ) 163,661 Construction-in-progress 28,584,806 (61,211 ) — (165,336 ) 28,358,259 Right-of-use 7,574,010 — (2,790,437 ) — 4,783,573 Asset retirement costs 11,690,188 — (4,169,238 ) (146,423 ) 7,374,527 Others 12,955,782 — (10,327,101 ) — 2,628,681 ￦ 258,661,152 (493,328 ) (92,687,798 ) (778,199 ) 164,701,827
Changes in property, plant and equipment	Changes in property, plant and equipment for the years ended December 31, 2018 and 2019 are as follows: 2018 Beginning Acquisition Disposal Depreciation Impairment(*1) Others Ending balance In millions of won Land ￦ 13,318,542 2,254 (18,240 ) — — 251,736 13,554,292 (Government grants) (21,968 ) — — — — — (21,968 ) Buildings 12,053,526 10,156 (8,545 ) (767,845 ) (1,896 ) 648,295 11,933,691 (Government grants) (63,539 ) (4,213 ) 31 6,836 — (2,304 ) (63,189 ) Structures 44,104,778 11,123 (587,278 ) (2,476,278 ) (360 ) 1,659,810 42,711,795 (Government grants) (196,414 ) — 3,270 10,292 — (8,002 ) (190,854 ) Machinery(*2) 46,875,798 460,676 (250,159 ) (4,973,252 ) (393,839 ) 5,737,371 47,456,595 (Government grants) (183,188 ) (1,185 ) 823 18,099 — (7,791 ) (173,242 ) Ships 403 — — (103 ) — 2 302 Vehicles 81,038 2,774 (402 ) (32,620 ) — 21,399 72,189 (Government grants) (6,322 ) (45 ) — 2,146 — 1 (4,220 ) Equipment 420,672 36,884 (265 ) (187,821 ) (36 ) 113,425 382,859 (Government grants) (761 ) (22 ) — 365 — — (418 ) Tools 200,663 12,331 (268 ) (83,283 ) (6 ) 63,238 192,675 (Government grants) (1,027 ) (44 ) — 432 — (36 ) (675 ) Construction-in-progress 25,572,541 11,749,397 (47,463 ) — (167,603 ) (8,285,705 ) 28,821,167 (Government grants) (49,084 ) (23,895 ) — — — 18,239 (54,740 ) Finance lease assets 297,679 — — (101,888 ) — (61 ) 195,730 (Government grants) (27 ) — — 1 — — (26 ) Asset retirement costs 6,039,484 1,988 — (610,435 ) (146,424 ) 287,141 5,571,754 Others 2,439,620 8,691 (715 ) (709,579 ) — 621,460 2,359,477 ￦ 150,882,414 12,266,870 (909,211 ) (9,904,933 ) (710,164 ) 1,118,218 152,743,194 (*1) Korea Hydro & Nuclear Power Co., Ltd. And Korea Western Power Co., Ltd., 100% owned subsidiaries, have determined that there are impairment indicators for the shutdowns of certain power generation units and fire, and performed an impairment test over the individual assets. As a result, the Company recognized the amount of the carrying amount in excess of its recoverable amount as an impairment loss in the consolidated statements of comprehensive income. (*2) As described in Note 26, the amount of acquisition of machinery includes ￦204,787 million of that the Company believes the possibility of economic benefit outflow is probable on the request for additional construction costs of Hyundai E&C, GS Engineering & Construction Corp. and Hansol SeenTec Co., Ltd. 2019 Beginning Effect of change Acquisition Disposal Depreciation Impairment Others Ending balance In millions of won Land ￦ 13,554,292 — 40,752 (29,205 ) — (25,626 ) 307,850 13,848,063 (Government grants) (21,968 ) — — 151 — — — (21,817 ) Buildings 11,933,691 — 3,195 (23,409 ) (821,680 ) (1,293 ) 1,355,202 12,445,706 (Government grants) (63,189 ) — (592 ) — 6,214 — (4,353 ) (61,920 ) Structures 42,711,795 — 1,663 (470,230 ) (2,399,283 ) (1,234 ) 5,336,159 45,178,870 (Government grants) (190,854 ) — — 2,405 9,373 — (7,478 ) (186,554 ) Machinery 47,456,595 — 326,606 (248,951 ) (5,452,669 ) (12,247 ) 7,837,966 49,907,300 (Government grants) (173,242 ) — (1,050 ) 635 17,993 — (3,243 ) (158,907 ) Ships 302 — — — (100 ) — (1 ) 201 Vehicles 72,189 — 3,789 4,558 (33,650 ) — 23,699 70,585 (Government grants) (4,220 ) — (228 ) 5 2,170 — (2 ) (2,275 ) Equipment 382,859 — 47,532 (162 ) (199,376 ) (227 ) 143,489 374,115 (Government grants) (418 ) — (81 ) — 262 — (4 ) (241 ) Tools 192,675 — 20,956 (31 ) (87,708 ) — 38,172 164,064 (Government grants) (675 ) — — — 281 — (9 ) (403 ) Construction-in-progress 28,821,167 — 13,544,091 (199,853 ) — (8,828 ) (13,737,107 ) 28,419,470 (Government grants) (54,740 ) — 12,338 — — — (18,809 ) (61,211 ) Finance lease assets 195,730 (195,730 ) — — — — — — (Government grants) (26 ) 26 — — — — — — Right-of-use — 5,143,651 220,996 — (581,074 ) — — 4,783,573 Asset retirement costs 5,571,754 — — — (626,856 ) — 2,429,629 7,374,527 Others 2,359,477 — 1,388 (221 ) (800,653 ) (581 ) 1,069,271 2,628,681 ￦ 152,743,194 4,947,947 14,221,355 (964,308 ) (10,966,756 ) (50,036 ) 4,770,431 164,701,827 (*1) KEPCO Bylong Australia Pty., Ltd., 100% owned subsidiary, performed an impairment test over its land and others. The Company recognized the amount of the carrying amount in excess of its recoverable amount as an impairment loss. (*2) ‘Others’ include the amounts of assets acquired by the business combination. (see Note 51) (*3) ‘Others’ include immaterial amounts which have been reclassed from Construction-in-progress (*4) As described in Note 2, the Company recognized impairment loss of ￦3,819 million related to Wolsong unit 1, Shin-Hanul unit 3 and 4 and reversal of impairment loss of ￦16,693 million related to Wolsong unit 1.

Investment Properties (Tables)

Investment Properties (Tables)	12 Months Ended
	Dec. 31, 2019
Investment Properties [Abstract]
Investment Properties	Investment properties as of December 31, 2018 and 2019 are as follows: 2018 Acquisition Government Accumulated Book value In millions of won Land ￦ 139,940 — — 139,940 Buildings 34,801 (50 ) (15,132 ) 19,619 ￦ 174,741 (50 ) (15,132 ) 159,559 2019 Acquisition Government Accumulated Book value In millions of won Land ￦ 129,897 — — 129,897 Buildings 64,590 (13 ) (35,894 ) 28,683 ￦ 194,487 (13 ) (35,894 ) 158,580
Changes in investment properties	Changes in investment properties for the years ended December 31, 2018 and 2019 are as follows: 2018 Beginning Depreciation Others Ending In millions of won Land ￦ 264,205 — (124,265 ) 139,940 Buildings 20,592 (924 ) 1 19,669 (Government grants) (83 ) 1 32 (50 ) ￦ 284,714 (923 ) (124,232 ) 159,559 2019 Beginning Depreciation Others(*) Ending In millions of won Land ￦ 139,940 — (10,043 ) 129,897 Buildings 19,669 (5,070 ) 14,097 28,696 (Government grants) (50 ) 1 36 (13 ) ￦ 159,559 (5,069 ) 4,090 158,580 (*) As described in Note 42, the Company reclassified land and buildings amounting to ￦2,765 million and ￦19,369 million, respectively, from assets held-for-sale
Income and expenses related to investment properties	Income and expenses related to investment properties for the years ended December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Rental income ￦ 9,494 9,782 Operating and maintenance expenses related to rental income (923 ) (1,257 ) Operating and maintenance expenses not related to rental income — (3,812 ) ￦ 8,571 4,713
Fair value of investment properties	Fair value of investment properties as of December 31, 2018 and 2019 are as follows: 2018 2019 Book value Fair value Book value Fair value In millions of won Land ￦ 139,940 167,178 129,897 202,042 Buildings 19,619 23,276 28,683 38,046 ￦ 159,559 190,454 158,580 240,088 The fair values of the investment properties as of the reporting date were determined in consideration of the fluctuation on the publicly announced individual land price after the IFRS transition date (January 1, 2010).

Construction Services Contrac_2

Construction Services Contracts (Tables)	12 Months Ended
	Dec. 31, 2019
Construction Services Contracts [Abstract]
Changes in total contract amount in which revenue is not yet recognized	Changes in total contract amount in which revenue is not yet recognized for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 Beginning balance Increase Recognized as revenue Ending In millions of won Nuclear power plant construction in UAE and others ￦ 7,236,888 151,891 (3,212,184 ) 4,176,595 (*) For the year ended December 31, 2017, the increased balance of contracts from new orders and other is ￦438,142 million and the decreased balance of contracts due to changes in scope of construction work is ￦286,251 million. 2018 Beginning balance Increase Recognized as revenue Ending In millions of won Nuclear power plant construction in UAE and others ￦ 4,176,595 1,186,584 (1,742,391 ) 3,620,788 (*) For the year ended December 31, 2018, the increased balance of contracts from new orders and foreign exchange impact is ￦1,207,097 million and the decreased balance of contracts due to changes in scope of construction work is ￦20,513 million. 2019 Beginning balance Increase Recognized as revenue Ending In millions of won Nuclear power plant construction in UAE and others ￦ 3,620,788 379,269 (1,264,916 ) 2,735,141 (*) For the year ended December 31, 2019, the increased balance of contracts from new orders and foreign exchange impact is ￦390,224 million and the decreased balance of contracts due to changes in scope of construction work is ￦10,955 million.
Accumulated earned revenue, expense and others	Accumulated earned revenue, expense and others related to the Company’s construction contracts as of December 31, 2018 and 2019 are as follows: 2018 Accumulated earned revenue Accumulated expense Accumulated profit Unearned advance receipts In millions of won Nuclear power plant construction in UAE and others ￦ 19,801,220 18,651,188 1,150,032 — 2019 Accumulated earned revenue Accumulated expense Accumulated profit Unearned advance receipts In millions of won Nuclear power plant construction in UAE and others ￦ 20,971,487 19,566,647 1,404,840 —
Gross amount of assets and liabilities for contract	Gross amount due from customers recognized as contract assets and due to customers recognized as contract liabilities for contract work as of December 31, 2018 and 2019 are as follows: 2018 2019 Contract Contract Contract Contract In millions of won Nuclear power plant construction in UAE and others ￦ 36,232 350,460 53,827 73,420 (*1) Included in trade and other receivables, net, in the consolidated statements of financial position. The balance of receivables from construction contracts are ￦35,218 million and ￦46,489 million, as of December 31, 2018 and 2019, respectively. (*2) Included in non-financial

Intangible Assets other than _2

Intangible Assets other than Goodwill (Tables)	12 Months Ended
	Dec. 31, 2019
Intangible Assets other than Goodwill [Abstract]
Intangible Assets other than Goodwill	Intangible assets as of December 31, 2018 and 2019 are as follows: 2018 Acquisition Government Accumulated Accumulated Book value In millions of won Software ￦ 619,662 (420 ) (461,981 ) — 157,261 Licenses and franchises 3,398 — (3,398 ) — — Copyrights, patents rights and other industrial rights 97,033 — (29,921 ) — 67,112 Mining rights 561,945 — (27,421 ) — 534,524 Development expenditures 878,462 (2,110 ) (785,976 ) — 90,376 Intangible assets under development 83,381 (10,564 ) — (12,845 ) 59,972 Usage rights of donated assets and other 459,682 — (372,671 ) — 87,011 Leasehold rights 25,482 — (19,930 ) — 5,552 Greenhouse gas emissions rights 7,050 — — — 7,050 Others 333,621 — (104,486 ) (12,051 ) 217,084 ￦ 3,069,716 (13,094 ) (1,805,784 ) (24,896 ) 1,225,942 2019 Acquisition Government Accumulated Accumulated Book value In millions of won Software ￦ 707,731 (235 ) (542,736 ) — 164,760 Licenses and franchises 3,398 — (3,398 ) — — Copyrights, patents rights and other industrial rights 102,828 — (40,389 ) (9,178 ) 53,261 Mining rights 584,969 — (28,456 ) (512,790 ) 43,723 Development expenditures 916,834 (1,492 ) (822,972 ) (19 ) 92,351 Intangible assets under development 73,335 (11,029 ) — (12,845 ) 49,461 Usage rights of donated assets and other 582,825 — (389,664 ) — 193,161 Leasehold rights 25,989 — (20,671 ) — 5,318 Greenhouse gas emissions rights 41,656 — — — 41,656 Others 557,749 (79 ) (119,446 ) (11,939 ) 426,285 ￦ 3,597,314 (12,835 ) (1,967,732 ) (546,771 ) 1,069,976
Changes in intangible assets	2018 Beginning Acquisition Disposal Amortization Impairment(*) Others Ending In millions of won Software ￦ 125,891 10,861 (1 ) (53,755 ) — 74,685 157,681 (Government grants) (486 ) — — 254 — (188 ) (420 ) Copyrights, patents rights and other industrial rights 23,981 28 — (8,665 ) (13 ) 51,781 67,112 Mining rights 539,633 29,687 — (3,186 ) — (31,610 ) 534,524 Development expenditures 84,518 823 — (27,100 ) — 34,245 92,486 (Government grants) (3,702 ) — — 1,591 — 1 (2,110 ) Intangible assets under development 139,910 67,383 — — (8,912 ) (127,845 ) 70,536 (Government grants) (10,540 ) — — — 799 (823 ) (10,564 ) Usage rights of donated assets and other 101,658 — — (13,307 ) — (1,340 ) 87,011 (Government grants) (11 ) — — 11 — — — Leasehold rights 5,044 — — (667 ) — 1,175 5,552 Greenhouse gas emissions rights — — — — — 7,050 7,050 Others 181,225 1,805 (8 ) (14,114 ) (14 ) 48,190 217,084 (Government grants) — — — — — — — ￦ 1,187,121 110,587 (9 ) (118,938 ) (8,140 ) 55,321 1,225,942 (*) Includes ￦8,104 million of impairment loss on the intangible assets under development in relation to the technology development of heat transfer tube owned by KEPCO Nuclear Fuel Co., Ltd., 96.36% owned subsidiary. 2019 Beginning Acquisition Disposal Amortization Impairment(*1) Others(*2) Ending In millions of won Software ￦ 157,681 42,694 (774 ) (81,883 ) — 47,277 164,995 (Government grants) (420 ) — — 202 — (17 ) (235 ) Copyrights, patents rights and other industrial rights 67,112 171 (325 ) (9,196 ) — (4,501 ) 53,261 Mining rights 534,524 8,742 — (7,186 ) (513,519 ) 21,162 43,723 Development expenditures 92,486 687 — (28,901 ) (68 ) 29,639 93,843 (Government grants) (2,110 ) — — 833 — (215 ) (1,492 ) Intangible assets under development 70,536 56,082 — — — (66,128 ) 60,490 (Government grants) (10,564 ) — — — — (465 ) (11,029 ) Usage rights of donated assets and other 87,011 — — (15,632 ) — 121,782 193,161 (Government grants) — — — — — — — Leasehold rights 5,552 — — (741 ) — 507 5,318 Greenhouse gas emissions rights 7,050 118,743 (7,058 ) — — (77,079 ) 41,656 Others 217,084 2,307 (164 ) (14,413 ) (22 ) 221,572 426,364 (Government grants) — — — 2 — (81 ) (79 ) ￦ 1,225,942 229,426 (8,321 ) (156,915 ) (513,609 ) 293,453 1,069,976 (*1) KEPCO Australia Pty., Ltd. and KEPCO Bylong Australia Pty., Ltd., 100% owned subsidiaries, performed an impairment test over the mining rights and the Company recognized the amount of the carrying amount in excess of its recoverable amount as an impairment loss. (*2) ‘Others’ include the business rights amounting to ￦172,434 million increased from the business combination between Korea East-West Power Co., Ltd. and Eumseong Natural Gas Power Co., Ltd. (see note 51)
Significant specific intangible assets	Significant specific intangible assets as of December 31, 2018 and 2019 are as follows: 2018 Type Description Currency Amount Remaining useful lives In millions of won and thousands of Australian dollars Software ERP system and others KRW 783 2 years and 2 months ~ 2 years and 4 months Electricity sales information system KRW 6,477 4 years Copyrights, patents rights and other industrial rights Smart technology verification and standard design project conducting right KRW 9,256 3 years and 9 months Contributions to ARP NRC DC KRW 46,594 9 years Mining rights Mining right of Bylong mine AUD 401,225 — (*) Development expenditures Electricity sales information system KRW 22,337 3 years and 3 months Usage rights of donated assets and others Sejong Haengbogdosi sharing charge Dangjin power plant load facility usage right KRW KRW 35,923 7 years and 11 months 2 years and 3 months Others Occupancy and use of public waters KRW 97,858 18 years and 1 month (*) Mining rights are amortized using the units-of-production 2019 Type Description Currency Amount Remaining useful lives In millions of won and thousands of Australian dollars Software ERP system and others KRW 432 1 year and 2 months ~ 1 year and 4 months Electricity sales information system KRW 4,824 3 years Copyrights, patents rights and other industrial rights Smart technology verification and standard design project conducting right KRW 6,787 2 years and 9 months Contributions to ARP NRC DC KRW 34,755 8 years Mining rights Mining right of Bylong mine AUD — — (*) Development expenditures Electricity sales information system KRW 15,283 2 years and 3 months Usage rights of donated assets and others Sejong Haengbogdosi sharing charge Dangjin power plant load facility usage right KRW KRW 31,385 7,870 6 years and 11 months 1 year and 3 months Others Occupancy and use of public waters KRW 92,446 17 years and 1 month Business rights KRW 171,955 29 years and 11 months (*) The carrying amount of mining right does not exist, because KEPCO Australia Pty., Ltd. and KEPCO Bylong Australia Pty., Ltd. recognized impairment losses in full during the year ended December 31, 2019.
Recognized research and development expenses	For the years ended December 31, 2017, 2018 and 2019, the Company recognized research and development expenses of ￦ 721,437 million, ￦ 723,888 million and ￦ 735,715 million, respectively.

Trade and Other Payables (Table

Trade and Other Payables (Tables)	12 Months Ended
	Dec. 31, 2019
Trade and Other Payables [Abstract]
Trade and Other Payables	Trade and other payables as of December 31, 2018 and 2019 are as follows: 2018 2019 Current Non-current Current Non-current In millions of won Trade payables ￦ 3,411,830 — 2,859,721 — Other trade payables 1,630,860 2,626,876 1,952,659 2,446,714 Accrued expenses 1,127,796 1,859 1,028,869 2,033 Leasehold deposits received 1,949 1,084 2,571 709 Other deposits received 169,317 72,453 163,382 68,702 Lease liabilities — — 635,349 4,434,784 Finance lease liabilities 57,200 226,606 — — Dividends payable 6,443 — 6,851 — Others(*) — 12,818 — 12,818 ￦ 6,405,395 2,941,696 6,649,402 6,965,760 (*) Details of others as of December 31, 2018 and 2019 are as follows: 2018 2019 Current Non-current Current Non-current In millions of won Advance received from local governments ￦ — 5,818 — 5,818 Others — 7,000 — 7,000 ￦ — 12,818 — 12,818

Borrowings and Debt Securities

Borrowings and Debt Securities (Tables)	12 Months Ended
	Dec. 31, 2019
Borrowings and Debt Securities [Abstract]
Borrowings and Debt Securities	2018 2019 In millions of won Current liabilities Short-term borrowings ￦ 860,602 1,098,555 Current portion of long-term borrowings 312,994 217,579 Current portion of debt securities 6,790,778 7,545,485 Less : Current portion of discount on long-term borrowings (972 ) (1,000 ) Less : Current portion of discount on debt securities (1,974 ) (2,780 ) Add : Current portion of premium on debt securities 20 — 7,961,448 8,857,839 Non-current Long-term borrowings 3,280,015 3,411,052 Debt securities 49,905,077 55,716,183 Less : Discount on long-term borrowings (22,000 ) (21,309 ) Less : Discount on debt securities (89,913 ) (88,920 ) Add: Premium on debt securities — 1,696 53,073,179 59,018,702 ￦ 61,034,627 67,876,541
Repayment schedule of borrowings and debt securities	Repayment schedule of borrowings and debt securities as of December 31, 2018 and 2019 are as follows: 2018 Type Borrowings Debt Securities In millions of won Less than 1 year ￦ 1,173,596 6,790,778 1~ 5 years 1,911,226 30,175,734 Over 5 years 1,368,789 19,729,343 ￦ 4,453,611 56,695,855 2019 Type Borrowings Debt Securities In millions of won Less than 1 year ￦ 1,316,134 7,545,485 1~ 5 years 2,113,404 31,552,963 Over 5 years 1,297,648 24,163,220 ￦ 4,727,186 63,261,668
Short-term borrowings	Short-term borrowings as of December 31, 2018 and 2019 are as follows: 2018 Type Creditor Interest rate (%) Maturity Foreign currency Local currency In millions of won and thousands of foreign currencies Local short-term KTB Investment and 2.05~2.51 2019.01.04~ 2019.02.20 — ￦ 674,000 Foreign short-term SCNT and others 4.60~6.50 2019.12.03 USD 8,955 10,013 Foreign short-term BDO Unibank 6.59 2020.12.17(*) PHP 450,000 9,581 Local bank overdraft Nonghyup Bank 2.59~3.09 2019.01.10~ 2019.12.31 — 142,773 Local bank overdraft Woori Bank Standard overdraft 2019.02.26 — 24,235 ￦ 860,602 2019 Type Creditor Interest rate (%) Maturity Foreign currency Local currency In millions of won and thousands of foreign currencies Local short-term DB financial investment and others 2.00~2.20 2020.01.13~ — ￦ 280,000 Foreign short-term LG-CNS 4.60 2020.06.30 USD 23,699 27,439 Foreign short-term BDO Unibank 3.92 2020.12.20 PHP 225,000 5,130 Foreign short-term Mizuho Bank 4.60 2020.06.30 USD 11,027 12,767 Electronic short-term Mirae asset daewoo and others 1.72~2.20 2020.01.10~ — 400,000 Local bank overdraft Korea development Bank and others 1.98~2.75 2020.01.01~ — 373,219 ￦ 1,098,555 (*) The contractual maturity is 2020 but is classified as short-term borrowing due to intention of early payment in 3 months after borrowing.
Long-term borrowings	2018 Type Interest rate (%) Maturity Foreign currency Local currency In millions of won and thousands of foreign currencies Local long-term borrowings Korea Development Bank Others 0.50 2019~2044 — ￦ 4,154 Facility 2.45~4.60 2023~2028 — 66,793 Operating funds 2.59~3.56 2020~2021 — 67,000 Operating funds 1yr KoFC bond 2020 — 14,000 Hana Bank Commercial Paper 3M CD+0.19~0.32 2021~2023 — 950,000 Facility 4.60 2028 — 13,781 Facility 3yr KTB rate-1.25 2019~2028 — 8,072 IBK PF Refinancing CD+1.25 2030 — 22,500 Export-Import Bank of Korea Project loans 1.50 2026 — 22,096 Operating funds 2.21 2020 — 35,000 Korea Energy Agency Development of power resources 3yr KTB rate-2.25 2023~2025 — 5,558 Facility 3yr KTB rate-2.25 2019~2024 — 2,589 Project loans — 2023 — 1,197 Others KTB rate -2.25 2024~2028 — 17,347 Shinhan Bank Collateral borrowing 2.32 2019 — 30,000 Facility CB rate+1.10 2028 — 20,672 Others 3.95 2035 — 103,851 Others Standard overdraft 2035 — 103,851 Kookmin Bank Facility 3.16 2020 — 10,000 Facility MOR+0.79 2023 — 30,333 Others Facility 1.75~4.60 2026~2036 — 168,080 Facility CB rate+1.10~1.60 2023~2036 — 52,810 PF Refinancing 4.10 2030 — 62,500 Others 4.50~7.90 2022~2039 — 102,347 1,914,531 Foreign long-term borrowings Korea Energy Agency Project loans — 2021~2023 USD 8,744 9,776 Export-Import Bank of Korea and others Direct loan and others 1M Libor+1.80~ 3.20 2036 USD 123,909 138,542 Direct loan and others 3M Libor+2.75~ 3.70 2027 JOD 158,524 249,783 Commercial loan and others 3M Libor+1.50~ 2.50 2030~2033 USD 277,538 310,315 PF Loan 6M Libor+1.70~ 2.50 2032 USD 126,798 141,773 Others 3.88 2021 USD 278,105 310,427 SCNT and others Shareholder’s loan 8.00 2031 JOD 4,853 7,647 Shareholder’s loan 6.50~8.00 2023 USD 44,680 49,956 PT PJB Shareholder’s loan 12.75 2019 IDR 5,569,304 428 Samsung Life Insurance and others Syndicated Loan 3.10 2032 JPY 5,286,835 53,565 Woori Bank and others Syndicated Loan JPY 6M Libor+2.00 2032 JPY 3,410,381 34,553 SMBC and others Equity Bridge Loan 1M Libor+0.90 2019 USD 44,019 49,218 IFC and others Others 6M Libor+5.00 2031 PKR 25,900,420 206,944 Federal Financing Bank and others PF loan 2.39~13.00 2031~2038 USD 102,322 114,406 Others Others — 2019 USD 1,025 1,145 1,678,478 3,593,009 Less : Discount on long-term borrowings (22,972 ) Less : Current portion of long-term borrowings (312,994 ) Add : Current portion of discount on long-term borrowings 972 ￦ 3,258,015 2019 Type Interest rate (%) Maturity Foreign currency Local currency In millions of won and thousands of foreign currencies Local long-term borrowings Korea Development Bank Others 0.50 2020~2044 — ￦ 3,500 Facility 2.50~4.60 2023~2028 — 59,845 Operating funds 2.33~3.04 2020~2022 — 55,000 Operating funds 1yr KoFC bond rate +0.95 2020~2022 — 24,000 Hana Bank Commercial Paper 3M CD+0.13~0.32 2021~2024 — 1,150,000 Facility 4.60 2028 — 12,466 Facility 3yr KTB rate-1.25 2020~2028 — 6,699 IBK PF Refinancing CD+1.25 2030 — 10,497 Export-Import Bank of Korea Project loans 1.50 2026 — 19,150 Operating funds 2.21 2020 — 35,000 Korea Energy Agency Development of power resources 3yr KTB rate-2.25 2023~2025 — 4,350 Facility 3yr KTB rate-2.25 2020~2024 — 2,058 Project loans — 2023 — 1,197 Others KTB rate-2.25 2024~2028 — 15,696 Shinhan Bank Facility CB rate+1.10 2028 — 18,698 Others 3.95 2035 — 99,146 Others Standard overdraft rate+1.00 2035 — 99,146 Kookmin Bank Facility 3.16 2020 — 10,000 Facility MOR+0.79 2023 — 23,333 Others Facility 1.75~6.80 2026~2036 — 390,044 Facility CB rate+1.10~1.60 Standard overdraft rate+2.45 2023~2036 — 111,834 PF Refinancing 4.10 2030 — 29,159 Others 4.50~7.90 2022~2039 — 102,348 2,283,166 Foreign long-term borrowings Korea Energy Agency Project loans — 2021~2023 USD 8,744 10,123 Export-Import Bank of Korea and others Direct loan and others 1M Libor+1.80~3.20 2036 USD 101,912 117,994 Direct loan and others 3M Libor+2.75~3.70 2027 JOD 146,380 239,039 PF Loan 6M Libor+2.50~2.70 2032 USD 118,684 137,412 Others 3.88 2021 USD 289,709 334,685 SCNT and others Shareholder’s loan 6.50~8.00 2023 USD 13,000 15,051 Shareholder’s loan 8.00 2031 JOD 4,853 7,925 Samsung Life Insurance and others Syndicated Loan 3.10 2032 JPY 4,981,038 52,972 Woori Bank and others Syndicated Loan JPY 6M Libor+2.00 2032 JPY 3,213,121 34,171 IFC and others Others 6M Libor+5.00 2031 PKR 37,252,930 278,652 Federal Financing Bank and others PF Loan 2.39~13.00 2031~2038 USD 101,380 117,377 Others Others — — USD 57 64 1,345,465 3,628,631 Less : Discount on long-term borrowings (22,309 ) Less : Current portion of long-term borrowings (217,579 ) Add : Current portion of discount on long-term borrowings 1,000 ￦ 3,389,743
Local debt securities	Local debt securities as of December 31, 2018 and 2019 are as follows: Issue date Maturity Interest 2018 2019 In millions of won Electricity Bonds 2010.04.08~ 2019.12.30 2020.01.12~ 2049.10.24 1.32~5.26 ￦ 24,480,000 28,450,000 Corporate Bonds(*) 2009.10.16~ 2019.12.19 2020.02.22~ 2049.12.19 1.29~6.00 23,223,228 24,463,577 47,703,228 52,913,577 Less : Discount on local debt securities (41,247 ) (42,274 ) Less : Current portion of local debt securities (5,330,000 ) (6,340,000 ) Add : Current portion of discount on local debt securities 1,035 1,409 ￦ 42,333,016 46,532,712 (*) Corporate bonds of HeeMang Sunlight Power Co., Ltd. amounting to ￦2,697 million can be redeemed every March 31 after five years from its issue date, March 31, 2016.
Foreign debt securities	Foreign debt securities as of December 31, 2018 and 2019 are as follows: 2018 Type Issue date Maturity Interest rate (%) Foreign currency Local currency In millions of won and thousands of foreign currencies FY-96 1996.04.01~ 1996.12.06 2026.12.01~ 2096.04.01 6.00~8.37 USD 249,071 ￦ 278,488 FY-97 1997.01.31~ 1997.08.04 2027.02.01~ 2027.08.01 6.75~7.00 USD 314,717 351,885 FY-04 2004.04.23 2034.04.23 5.13 USD 286,920 320,805 FY-11 2011.07.13 2021.07.13 4.75 USD 500,000 559,050 FY-12 2012.09.19 2022.09.19 3.00 USD 750,000 838,575 FY-13 2013.09.26~ 2013.10.23 2019.03.26~ 2019.04.23 1.50~1.63 CHF 400,000 454,488 FY-13 2013.09.25 2020.09.25 5.75 AUD 325,000 256,038 FY-14 2014.02.11~ 2014.12.02 2019.02.11~ 2029.07.30 2.38~3.57 USD 1,500,000 1,677,150 FY-15 2015.06.15 2025.06.15 3.25 USD 300,000 335,430 FY-16 2016.01.21 2021.07.21 2.50 USD 300,000 335,430 FY-17 2017.04.12~ 2017.07.25 2020.04.12~ 2027.07.25 2.38~3.13 USD 1,100,000 1,229,910 FY-17 2017.10.30 2037.10.30 1.70 EUR 40,000 51,166 FY-17 2017.11.16 2037.11.16 2.36 SEK 450,000 56,061 FY-18 2018.01.29~ 2018.07.25 2021.01.29~ 2023.07.25 3.00~3.88 USD 1,800,000 2,012,580 FY-18 2018.03.13 2028.03.13 3.35 HKD 1,650,000 235,571 8,992,627 Less : Discount on foreign debt securities (50,640 ) Add : Premium on foreign debt securities 20 Less : Current portion of foreign debt securities (1,460,778 ) Add : Current portion of discount on foreign debt securities 939 Less: Current portion of premium on foreign debt securities (20 ) ￦ 7,482,148 2019 Type Issue date Maturity Interest rate (%) Foreign currency Local currency In millions of won and thousands of foreign currencies FY-96 1996.04.01~ 1996.12.06 2026.12.01~ 2096.04.01 6.00~7.95 USD 249,074 ￦ 288,379 FY-97 1997.01.31~ 1997.08.04 2027.02.01~ 2027.08.01 6.75~7.00 USD 314,717 364,379 FY-04 2004.04.23 2034.04.23 5.13 USD 286,920 332,196 FY-11 2011.07.13 2021.07.13 4.75 USD 500,000 578,900 FY-12 2012.09.19 2022.09.19 3.00 USD 750,000 868,350 FY-13 2013.09.25 2020.09.25 5.75 AUD 325,000 263,361 FY-14 2014.07.30~ 2014.12.02 2020.06.02~ 2029.07.30 2.50~3.57 USD 600,000 694,680 FY-15 2015.06.15 2025.06.15 3.25 USD 300,000 347,340 FY-16 2016.01.21 2021.07.21 2.50 USD 300,000 347,340 FY-17 2017.04.12~ 2017.07.25 2020.04.12~ 2027.07.25 2.38~3.13 USD 1,100,000 1,273,580 FY-17 2017.10.30 2037.10.30 1.70 EUR 40,000 51,897 FY-17 2017.11.16 2037.11.16 2.36 SEK 450,000 55,737 FY-18 2018.01.29~ 2018.07.25 2021.01.29~ 2023.07.25 3.00~3.88 USD 1,800,000 2,084,040 FY-18 2018.03.13 2028.03.13 3.35 HKD 1,650,000 245,289 FY-19 2019.01.22~ 2019.06.24 2022.01.22~ 2024.06.24 2.50~3.38 USD 800,000 926,240 FY-19 2019.02.27 2024.02.27 0.13 CHF 200,000 239,104 FY-19 2019.07.19 2024.07.19~ 2027.07.19 0~0.05 CHF 300,000 358,656 FY-19 2019.07.22 2022.07.22 2.38 USD 300,000 347,340 FY-19 2019.10.31 2024.10.30 3M BBSW+97bp AUD 300,000 243,102 FY-19 2019.12.19 2037.12.31 3.3~5.7 USD 378,460 438,181 10,348,091 Less : Discount on foreign debt securities (49,426 ) Add : Premium on foreign debt securities 1,696 Less : Current portion of foreign debt securities (1,205,485 ) Add : Current portion of discount on foreign debt securities 1,371 ￦ 9,096,247
Changes in borrowings and debt securities	2018 2019 In millions of won Beginning balance ￦ 54,747,392 61,034,627 Cash flow 5,972,336 6,342,074 Effect of exchange rate fluctuations 322,515 494,414 Increase from the business combination — 2,900 Others (7,616 ) 2,526 Ending balance ￦ 61,034,627 67,876,541

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2019
Presentation of leases for lessee [Abstract]
Disclosure of quantitative information about right-of-use assets	Right-of-use 2019 Acquisition cost Government grants Accumulated depreciation Book value In millions of won Land ￦ 693,103 — (49,029 ) 644,074 Buildings 54,980 — (20,403 ) 34,577 Structures 28,198 — (2,554 ) 25,644 Machinery 1,308 — (484 ) 824 Ships 4,113,754 — (425,465 ) 3,688,289 Vehicles 20,817 — (7,109 ) 13,708 Others(*) 2,661,850 — (2,285,393 ) 376,457 ￦ 7,574,010 — (2,790,437 ) 4,783,573 (*) Including power purchase agreements (“PPA”) with GS EPS and two other LNG combined power suppliers.
Disclosure of Changes in right-of-use assets	Changes in right-of-use Beginning Changes in Increase Depreciation Ending balance In millions of won Land ￦ — 684,386 8,717 (49,029 ) 644,074 Buildings — 36,874 18,106 (20,403 ) 34,577 Structures — 20,840 7,358 (2,554 ) 25,644 Machinery — — 1,308 (484 ) 824 Ships — 3,986,947 126,807 (425,465 ) 3,688,289 Vehicles — 11,258 9,559 (7,109 ) 13,708 Others(*) — 403,346 49,141 (76,030 ) 376,457 ￦ — 5,143,651 220,996 (581,074 ) 4,783,573 (*) Including transferred amount of ￦195,704 million, which was classified as finance lease assets as of December 31, 2018.
Disclosure of maturity analysis of operating lease payments	2018 Minimum lease Present value of In millions of won Less than 1 year ￦ 87,709 57,200 1 ~ 5 years 228,783 170,676 More than 5 years 65,250 55,930 ￦ 381,742 283,806 2019 In millions of won Less than 1 year ￦ 686,445 1 ~ 5 years 2,334,883 More than 5 years 2,735,681 5,757,009 Less : Discount (686,876 ) Present value of lease payment ￦ 5,070,133
Disclosure of liquidity classification of lease liabilities	The details of the liquidity classification of lease liabilities (Prior year : finance lease liabilities) as of December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Current lease liabilities ￦ 57,200 635,349 Non-current 226,606 4,434,784 ￦ 283,806 5,070,133
Disclosure of additional information about leasing activities for lessee	Changes in lease liabilities for the years ended December 31, 2018 and 2019 are as follows: 2018 Beginning Acquisition Decrease Ending In millions of won Finance lease liabilities ￦ 418,260 — (134,454 ) 283,806 2019 Beginning Changes in Increase Decrease Interest Others(*) Ending In millions of won Lease liabilities ￦ 283,806 4,943,584 218,800 (659,387 ) 85,950 197,380 5,070,133 (*) Including translation effect of foreign currency lease liabilities and others.
Disclosure of details of expense relating to lease contracts as lessee	Details of expense relating to lease contracts as lessee for the year ended December 31, 2019 are as follows: 2019 In millions of won Depreciation of right-of-use ￦ 581,074 Interest expenses of lease liabilities 85,950 Leases expenses for short-term leases 20,127 Leases expenses for leases of low-value 1,616 Variable lease payments (15,912 ) ￦ 672,855
Disclosure of minimum lease payment and contingent rent payment recognized as an expense	Minimum lease payment and contingent rent payment recognized as an expense as a lessee for the year ended December 31, 2018 are as follows: 2018 In millions of won Minimum lease payment ￦ 111,530 Contingent rent payment (18,872 ) ￦ 92,658
Disclosure of Profit and loss related to finance lease	Profit and loss related to finance lease: 2019 In millions of won Finance income on the net investment in the lease ￦ 97,392
Disclosure of maturity analysis of finance lease payments receivable	Maturity analysis of the lease payments receivable and reconciliation of the undiscounted lease payments to the net investment in the lease as of December 31, 2019 are as follows: 2019 In millions of won Less than 1 year ￦ 173,093 1 ~ 2 years 150,895 2 ~ 3 years 150,596 3 ~ 4 years 149,364 4 ~ 5 years 145,964 More than 5 years 1,740,652 2,510,564 Less : Unearned finance income (1,331,723 ) Net investment in the lease ￦ 1,178,841 The implicit interest rate for a lease term is determined on the lease contract date. The implicit interest rate of the finance lease contracts is from 3.5% up to 16.48% per year as of December 31, 2019. (prior year : 3.5% ~ 9.12%) Finance lease receivables as of December 31,2018 are as follows: 2018 Minimum lease Present value of In millions of won Less than 1 year ￦ 124,918 84,688 1 ~ 5 years 467,518 223,622 More than 5 years 1,333,016 675,036 ￦ 1,925,452 983,346
Changes in the allowance for doubtful accounts of finance lease receivables	Changes in the allowance for doubtful accounts of finance lease receivables for the year ended December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Beginning balance ￦ — 1,133 Bad debt expense 1,133 — Reversal of allowance for doubtful accounts — (271 ) Ending balance ￦ 1,133 862

Employment Benefits (Tables)

Employment Benefits (Tables)	12 Months Ended
	Dec. 31, 2019
Employment Benefits [Abstract]
Employment Benefits	Employment benefit obligations as of December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Net defined benefit asset ￦ — (1,047 ) Net defined benefit obligations 1,638,785 1,925,134 Other long-term employee benefit obligations 6,284 4,720 ￦ 1,645,069 1,928,807
Principal assumptions on actuarial valuation	Principal assumptions on actuarial valuation as of December 31, 2018 and 2019 are as follows: 2018 2019 Discount rate 2.24%~2.90% 1.92%~2.05% Future salary and benefit levels 4.88% 4.39% Weighted average duration 13.71 years 13.23 years
Details of expense relating to defined benefit plans	Details of expense relating to defined benefit plans for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 2018 2019 In millions of won Current service cost ￦ 392,820 369,899 440,300 Interest cost 79,524 87,687 83,619 Expected return on plan assets (31,307 ) (42,135 ) (41,597 ) Past service cost — — 301,442 Loss from settlement (1,055 ) (767 ) (2,017 ) ￦ 439,982 414,684 781,747 Expenses as described above are recognized in those items below in the financial statements. 2017 2018 2019 In millions of won Cost of sales ￦ 332,249 308,672 580,623 Selling and administrative expenses 59,111 51,903 120,455 Others (Construction-in-progress 48,622 54,109 80,669 ￦ 439,982 414,684 781,747 In addition, for the years ended December 31, 2017, 2018 and 2019, employee benefit obligations expenses of ￦65,603 million, ￦66,833 million and ￦71,844 million, respectively, are recognized as cost of sales, and ￦11,983 million, ￦13,204 million and ￦12,775 million, respectively, are recognized as selling and administrative expenses, and ￦13,332 million, ￦14,189 million and ￦13,893 million, respectively, are recognized as construction-in-progress
Details of defined benefits	Details of defined benefit obligations as of December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Present value of defined benefit obligation from funded plans ￦ 3,414,116 4,035,400 Fair value of plan assets (1,775,331 ) (2,111,313 ) 1,638,785 1,924,087 Present value of defined benefit obligation from unfunded plans — — Net liabilities incurred from defined benefit plans ￦ 1,638,785 1,924,087
Changes in the present value of defined benefits	Changes in the present value of defined benefit obligations for the years ended December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Beginning balance ￦ 2,951,842 3,414,116 Current service cost 369,899 440,300 Interest cost(*) 87,687 83,619 Remeasurement component 154,939 (93,736 ) Past service cost — 301,442 Loss from settlement (767 ) (2,018 ) Actual payments (149,454 ) (108,057 ) Others (30 ) (266 ) Ending balance ￦ 3,414,116 4,035,400 (*) Corporate bond (AAA rated) yield at year-end
Changes in the fair value of plan assets	Changes in the fair value of plan assets for the years ended December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Beginning balance ￦ 1,475,641 1,775,331 Expected return 42,135 41,597 Remeasurement component (12,308 ) (11,186 ) Contributions by the employers 330,064 348,386 Actual payments (60,201 ) (42,815 ) Ending balance ￦ 1,775,331 2,111,313 In addition, loss on accumulated remeasurement component amounting to ￦219,381 million and ￦117,779 million has been recognized as other comprehensive income or loss for the years ended December 31, 2018 and 2019, respectively.
Details of the fair value of plan assets	Details of the fair value of plan assets as of December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Equity instruments ￦ 96,823 189,235 Debt instruments 510,184 648,265 Bank deposit 275,518 199,743 Others 892,806 1,074,070 ￦ 1,775,331 2,111,313 For the years ended December 31, 2018 and 2019, actual returns on plan assets amounted to ￦29,827 million and ￦30,411 million, respectively.
Remeasurement component recognized in other comprehensive income (loss)	Remeasurement component recognized in other comprehensive income (loss) for the years ended December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Actuarial gain from changes in financial assumptions ￦ 186,428 (2,916 ) Experience adjustments, etc. (31,489 ) (90,820 ) Expected return 12,308 11,186 ￦ 167,247 (82,550 ) Remeasurement component recognized as other comprehensive income or loss is recorded in retained earnings.

Provisions (Tables)

Provisions (Tables)	12 Months Ended
	Dec. 31, 2019
Provisions [Abstract]
Provisions	Provisions as of December 31, 2018 and 2019 are as follows: 2018 2019 Current Non-current Current Non-current In millions of won Employment benefits Provisions for employment benefits ￦ 976,347 — 975,619 — Litigation Litigation provisions 40,157 37,636 39,177 49,221 Decommissioning cost Nuclear plants — 13,388,134 — 15,994,039 Spent fuel — 1,291,354 401,741 953,539 Radioactive waste 4,310 1,680,698 77,053 1,811,029 PCBs — 147,668 — 152,981 Other recovery provisions — 10,477 — 10,773 Others Power plant regional support program 137,668 — 140,133 — Transmission regional support program 151,698 — 139,785 — Provisions for tax 6,845 — — — Provisions for financial guarantee 1,320 14,266 111 81,246 Provisions for RPS 93,919 — 2,889 — Provisions for greenhouse gas emissions obligations 136,187 — 682,459 — Others 46,347 15,515 145,754 13,220 ￦ 1,594,798 16,585,748 2,604,721 19,066,048
Changes in provisions	Changes in provisions for the years ended December 31, 2018 and 2019 are as follows: 2018 Beginning Increase in Payment Reversal Others Ending balance In millions of won Employment benefits Provisions for employment benefits ￦ 913,787 912,440 (843,281 ) (6,599 ) — 976,347 Litigation Litigation provisions(*) 73,576 234,517 (216,187 ) (13,847 ) (266 ) 77,793 Decommissioning cost Nuclear plants 13,007,228 411,316 (30,410 ) — — 13,388,134 Spent fuel 1,339,046 435,007 (482,699 ) — — 1,291,354 Radioactive waste 1,638,371 112,815 (66,178 ) — — 1,685,008 PCBs 180,087 4,600 (13,758 ) (23,261 ) — 147,668 Other recovery provisions 6,659 2,125 — — 1,693 10,477 Others Power plant regional support program 153,756 46,366 (71,978 ) — 9,524 137,668 Transmission regional support program 243,365 141,661 (233,328 ) — — 151,698 Provisions for tax 61 6,821 — — (37 ) 6,845 Provisions for financial guarantee 23,475 1,179 (67 ) (8,432 ) (569 ) 15,586 Provisions for RPS 271,624 297,802 (475,507 ) — — 93,919 Provisions for greenhouse gas emissions obligations 414,252 131,860 (350,356 ) (59,569 ) — 136,187 Others 96,925 44,732 (82,632 ) (745 ) 3,582 61,862 ￦ 18,362,212 2,783,241 (2,866,381 ) (112,453 ) 13,927 18,180,546 (*) As described in Note 50.(1), the Company believes that the possibility of economic benefit outflow is probable on the request for additional construction costs of Hyundai E&C, GS Engineering & Construction Corp. and Hansol SeenTec Co., Ltd. For this reason, the Company recognized ￦204,787 million of provision in addition to property, plant and equipment. 2019 Beginning Increase in Payment Reversal Others Ending balance In millions of won Employment benefits Provisions for employment benefits ￦ 976,347 900,033 (879,980 ) (20,781 ) — 975,619 Litigation Litigation provisions 77,793 59,366 (17,236 ) (31,525 ) — 88,398 Decommissioning cost Nuclear plants 13,388,134 2,639,562 (33,657 ) — — 15,994,039 Spent fuel 1,291,354 440,029 (376,103 ) — — 1,355,280 Radioactive waste 1,685,008 209,551 (6,787 ) — 310 1,888,082 PCBs 147,668 14,251 (8,938 ) — — 152,981 Other recovery provisions 10,477 2,020 (2,033 ) — 309 10,773 Others Power plant regional support program 137,668 41,341 (48,390 ) — 9,514 140,133 Transmission regional support program 151,698 169,616 (181,529 ) — — 139,785 Provisions for tax 6,845 — — (6,847 ) 2 — Provisions for financial guarantee 15,586 83,910 (16,589 ) (1,551 ) 1 81,357 Provisions for RPS 93,919 222,119 (313,149 ) — — 2,889 Provisions for greenhouse gas emissions obligations 136,187 724,002 (152,463 ) (25,267 ) — 682,459 Others 61,862 113,751 (16,217 ) (833 ) 411 158,974 ￦ 18,180,546 5,619,551 (2,053,071 ) (86,804 ) 10,547 21,670,769

Government Grants (Tables)

Government Grants (Tables)	12 Months Ended
	Dec. 31, 2019
Government grants [Abstract]
Government Grants	Government grants as of December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Land ￦ (21,968 ) (21,817 ) Buildings (63,189 ) (61,920 ) Structures (190,854 ) (186,554 ) Machinery (173,242 ) (158,907 ) Vehicles (4,220 ) (2,275 ) Equipment (418 ) (241 ) Tools (675 ) (403 ) Construction-in-progress (54,740 ) (61,211 ) Finance lease assets (26 ) — Investment properties (50 ) (13 ) Software (420 ) (235 ) Development expenditures (2,110 ) (1,492 ) Intangible assets under development (10,564 ) (11,029 ) Other intangible assets other than goodwill — (79 ) ￦ (522,476 ) (506,176 )
Changes in government Grants	Changes in government grants for the years ended December 31, 2018 and 2019 are as follows: 2018 Beginning Receipt Acquisition Offset the Disposal Others Ending In millions of won Cash ￦ — (30,416 ) — — — 30,416 — Land (21,968 ) — — — — — (21,968 ) Buildings (63,539 ) — — 6,836 31 (6,517 ) (63,189 ) Structures (196,414 ) — — 10,292 3,270 (8,002 ) (190,854 ) Machinery (183,188 ) — — 18,099 823 (8,976 ) (173,242 ) Vehicles (6,322 ) — — 2,146 — (44 ) (4,220 ) Equipment (761 ) — — 365 — (22 ) (418 ) Tools (1,027 ) — — 432 — (80 ) (675 ) Construction-in-progress (49,084 ) — 18,239 — — (23,895 ) (54,740 ) Finance lease assets (27 ) — — 1 — — (26 ) Investment properties (83 ) — — 1 — 32 (50 ) Software (486 ) — — 254 — (188 ) (420 ) Development expenditures (3,702 ) — — 1,591 — 1 (2,110 ) Intangible assets under development (10,540 ) — — — — (24 ) (10,564 ) Usage rights of donated assets and other (11 ) — — 11 — — — ￦ (537,152 ) (30,416 ) 18,239 40,028 4,124 (17,299 ) (522,476 ) 2019 Beginning Receipt Acquisition Offset the Disposal Others Ending In millions of won Cash ￦ — (21,705 ) — — — 21,705 — Land (21,968 ) — — — 151 — (21,817 ) Buildings (63,189 ) — — 6,214 — (4,945 ) (61,920 ) Structures (190,854 ) — — 9,373 2,405 (7,478 ) (186,554 ) Machinery (173,242 ) — — 17,993 635 (4,293 ) (158,907 ) Vehicles (4,220 ) — — 2,170 5 (230 ) (2,275 ) Equipment (418 ) — — 262 — (85 ) (241 ) Tools (675 ) — — 281 — (9 ) (403 ) Construction-in-progress (54,740 ) — 12,338 — — (18,809 ) (61,211 ) Finance lease assets (26 ) — — — — 26 — Investment properties (50 ) — — 1 — 36 (13 ) Software (420 ) — — 202 — (17 ) (235 ) Development expenditures (2,110 ) — — 833 — (215 ) (1,492 ) Intangible assets under development (10,564 ) — — — — (465 ) (11,029 ) Others — — — 2 — (81 ) (79 ) ￦ (522,476 ) (21,705 ) 12,338 37,331 3,196 (14,860 ) (506,176 )

Deferred Revenues (Tables)

Deferred Revenues (Tables)	12 Months Ended
	Dec. 31, 2019
Deferred Revenues [Abstract]
Deferred Revenues	Deferred revenue for the years ended December 31, 2018 and 2019 are as follows which included in current and non-current non-financial 2018 2019 In millions of won Beginning balance ￦ 8,325,181 8,606,563 Increase during the current year 875,930 1,199,783 Recognized as revenue during the current year (594,548 ) (604,808 ) Ending balance ￦ 8,606,563 9,201,538

Non-financial Liabilities (Tabl

Non-financial Liabilities (Tables)	12 Months Ended
	Dec. 31, 2019
Other Liabilities Disclosure [Abstract]
Non-financial Liabilities	Non-financial 2018 2019 Current Non-current Current Non-current In millions of won Advance received ￦ 3,724,238 80,937 3,825,240 192,863 Unearned revenue 63,038 4,690 30,988 6,589 Deferred revenue 556,072 8,050,491 590,928 8,610,610 Withholdings 172,454 10,856 160,977 10,901 Others 1,058,239 13,059 1,080,220 13,489 ￦ 5,574,041 8,160,033 5,688,353 8,834,452

Contributed Capital (Tables)

Contributed Capital (Tables)	12 Months Ended
	Dec. 31, 2019
Disclosure of classes of share capital [Abstract]
Issued Capital	Details of shares issued as of December 31, 2018 and 2019 are as follows: 2018 Shares authorized Shares issued Par value per share (in won) Owned by Owned by Total In millions of won except share information Common shares 1,200,000,000 641,964,077 ￦ 5,000 1,640,385 1,569,435 3,209,820 (*) Korea Development Bank’s interest of ￦1,056,176 million is included. 2019 Shares authorized Shares issued Par value per share (in won) Owned by Owned by Total In millions of won except share information Common shares 1,200,000,000 641,964,077 ￦ 5,000 1,640,385 1,569,435 3,209,820 (*) Korea Development Bank’s interest of ￦1,056,176 million is included.
Number of Issued Capital	2018 2019 Number of shares Beginning balance 641,964,077 641,964,077 Ending balance 641,964,077 641,964,077
Share premium	2018 2019 In millions of won Share premium ￦ 843,758 843,758

Retained Earnings and Dividen_2

Retained Earnings and Dividends Paid (Tables)	12 Months Ended
	Dec. 31, 2019
Disclosure of Retained Earnings and Dividends Paid [Abstract]
Retained Earnings	2018 2019 In millions of won Legal reserve(*) ￦ 1,604,910 1,604,910 Voluntary reserves 35,906,267 34,785,425 Retained earnings before appropriations 14,007,942 12,811,798 Retained earnings ￦ 51,519,119 49,202,133 (*) The KEPCO Act requires KEPCO to appropriate a legal reserve equal to at least 20 percent of net income for each accounting period until the reserve equals 50 percent of KEPCO’s common stock. The legal reserve is not available for cash dividends; however, this reserve may be credited to paid-in
Voluntary reserves	Details of voluntary reserves as of December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Reserve for investment on social overhead capital ￦ 5,277,449 5,277,449 Reserve for research and human development(*) 330,000 330,000 Reserve for business expansion 30,088,818 28,967,976 Reserve for equalizing dividends 210,000 210,000 ￦ 35,906,267 34,785,425 (*) The reserve for research and human development is appropriated by KEPCO to use as qualified tax credits to reduce corporate tax liabilities. The reserve is available for cash dividends for a certain period as defined by the Restriction of Special Taxation Act of Korea.
Changes in Retained Earnings	2018 2019 In millions of won Beginning balance ￦ 53,370,558 51,519,119 Effect of change in accounting policy 71,928 — Net profit (loss) for the period attributed to owner of the Company (1,314,567 ) (2,345,517 ) Changes in equity method retained earnings (1,153 ) (6,789 ) Remeasurements of defined benefit liability, net of tax (100,495 ) 36,160 Transfer of gain (loss) on valuation of financial assets through other comprehensive income — (840 ) Dividends paid (507,152 ) — Ending balance ￦ 51,519,119 49,202,133
Dividends Paid	2017 In millions of won Number of shares issued Number of treasury stocks Number of shares eligible for dividends Dividends paid per share Dividends paid (In won) Common shares 641,964,077 — 641,964,077 ￦ 1,980 1,271,089 2018 In millions of won Number of shares issued Number of treasury stocks Number of shares eligible for dividends Dividends paid per share Dividends paid (In won) Common shares 641,964,077 — 641,964,077 ￦ 790 507,152 2019 In millions of won Number of shares issued Number of treasury stocks Number of shares eligible for dividends Dividends paid per share Dividends paid (In won) Common shares 641,964,077 — 641,964,077 ￦ — —
Changes in retained earnings of investments in associates and joint ventures	Changes in retained earnings of investments in associates and joint ventures for the years ended December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Beginning balance ￦ 5,122 3,969 Changes (1,153 ) (6,789 ) Ending balance ￦ 3,969 (2,820 )
Changes in retained earnings of remeasurement components	Changes in remeasurement components for the years ended December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Beginning balance ￦ (43,513 ) (219,381 ) Changes (154,198 ) 76,395 Income tax effect 53,703 (40,235 ) Transfer to reserve for business expansion (75,373 ) 65,442 Ending balance ￦ (219,381 ) (117,779 )

Statement of Appropriation of_2

Statement of Appropriation of Retained Earnings (Tables)	12 Months Ended
	Dec. 31, 2019
Statement of Appropriation of Retained Earnings [Abstract]
Statement of Appropriation of Retained Earnings	For the year ended December 31, 2018, KEPCO’s retained earnings were appropriated on March 22, 2019. For the year ended December 31, 2019, KEPCO’s deficits were appropriated on March 27, 2020. Statements of disposition of deficit and appropriation of retained earnings of KEPCO, the controlling company, for the years ended December 31, 2018 and 2019, respectively, are as follows: 2018 2019 In millions of won except for I.   Retained earnings before appropriations (undisposed deficit) Unappropriated retained earnings carried over from prior years ￦ — — Effect of change in accounting policy 39,813 — Net income (loss) (1,095,213 ) (2,594,957 ) Remeasurements of the defined benefit plan (65,442 ) (11,402 ) (1,120,842 ) (2,606,359 ) II. Transfer from voluntary reserves 1,120,842 2,606,359 III.  Subtotal (I+II) — — IV.  Appropriations of retained earnings — — V. Unappropriated retained earnings to be carried over forward to subsequent year — —

Hybrid Bonds (Tables)

Hybrid Bonds (Tables)	12 Months Ended
	Dec. 31, 2019
Hybrid Bonds [Abstract]
Hybrid Bonds	Hybrid bonds classified as equity (non-controlling Issuer Hybrid bond Issued date Maturity Yield (%) 2018 2019 In millions of won Korea South-East Power Co., Ltd. 1st hybrid bond 2012.12.07 2042.12.06 4.38 ￦ 170,000 170,000 Korea South-East Power Co., Ltd. 2nd hybrid bond 2012.12.07 2042.12.06 4.44 230,000 230,000 Expense of issuance (1,090 ) (1,090 ) ￦ 398,910 398,910 Although these instruments have contractual maturity dates, the contractual agreements allow these subsidiaries to indefinitely extend the maturity dates and defer the payment of interest without modification to the other terms of the instruments. When the Company decides not to pay dividends on ordinary shares, they are not required to pay interest on the hybrid bonds. Substantially, as these instruments have no contractual obligation to pay principal and interest, these instruments have been classified as equity (non-controlling

Other Components of Equity (Tab

Other Components of Equity (Tables)	12 Months Ended
	Dec. 31, 2019
Other Components of Equity [Abstract]
Other Components of Equity	2018 2019 In millions of won Other capital surplus ￦ 1,234,825 1,226,364 Accumulated other comprehensive loss (358,570 ) (280,730 ) Other equity 13,294,973 13,294,973 ￦ 14,171,228 14,240,607
Changes in other capital surplus	Changes in other capital surplus for the years ended December 31, 2018 and 2019 are as follows: 2018 2019 Gains on treasury stocks Others Subtotal Gains on disposal of treasury stocks Others Subtotal In millions of won Beginning balance ￦ 387,524 846,269 1,233,793 387,524 847,301 1,234,825 Issuance of share capital of subsidiary — 1,032 1,032 — — — Others — — — — (8,461 ) (8,461 ) Ending balance ￦ 387,524 847,301 1,234,825 387,524 838,840 1,226,364
Changes in accumulated other comprehensive income (loss)	Changes in accumulated other comprehensive income (loss) for the years ended December 31, 2018 and 2019 are as follows: 2018 Financial asset at fair value through other comprehensive income valuation reserve Shares in other income of investments in associates and Reserve for overseas translation credit Reserve for gain (loss) on derivatives Total In millions of won Beginning balance ￦ 29,268 66,464 (318,159 ) (49,030 ) (271,457 ) Effect of change in accounting Policy (76,851 ) — — — (76,851 ) Changes in the unrealized fair value of financial assets at FVOCI, net of tax (34,125 ) — — — (34,125 ) Shares in other comprehensive income of associates and joint ventures, net of tax — 57,089 — — 57,089 Foreign currency translation of foreign operations, net of tax — — (32,086 ) — (32,086 ) Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax — — — (1,140 ) (1,140 ) Ending balance ￦ (81,708 ) 123,553 (350,245 ) (50,170 ) (358,570 ) 2019 Financial asset at fair value through other comprehensive income valuation reserve Shares in other income of investments in associates and Reserve for overseas translation credit Reserve for gain (loss) on derivatives Total In millions of won Beginning balance ￦ (81,708 ) 123,553 (350,245 ) (50,170 ) (358,570 ) Changes in the unrealized fair value of financial assets at FVOCI, net of tax (10,891 ) — — — (10,891 ) Shares in other comprehensive income of associates and joint ventures, net of tax — 19,343 — — 19,343 Foreign currency translation of foreign operations, net of tax — — 55,347 — 55,347 Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax — — — 14,041 14,041 Ending balance ￦ (92,599 ) 142,896 (294,898 ) (36,129 ) (280,730 )
Changes in other equity	Details of changes in other equity for the years ended December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Statutory revaluation reserve ￦ 13,295,098 13,295,098 Changes in other equity (125 ) (125 ) ￦ 13,294,973 13,294,973

Sales (Tables)

Sales (Tables)	12 Months Ended
	Dec. 31, 2019
Revenue [Abstract]
Sales	Details of sales for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 2018 2019 Domestic Overseas Domestic Overseas Domestic Overseas In millions of won [Type of goods and services] Sales of goods ￦ 55,373,316 399,232 57,514,866 382,938 56,609,330 285,546 Electricity 54,649,882 — 56,842,011 — 55,939,001 — Heat supply 205,838 — 216,117 — 220,948 — Others 517,596 399,232 456,738 382,938 449,381 285,546 Sales related to rendering of services 186,990 164,167 176,539 216,328 222,106 186,184 Sales of construction services 92,501 3,119,683 108,586 1,633,805 110,692 1,154,224 ￦ 55,652,807 3,683,082 57,799,991 2,233,071 56,942,128 1,625,954 [Timing of revenue recognition] Performance obligations satisfied at a point in time ￦ 55,373,316 399,232 57,514,866 382,938 56,609,330 285,546 Performance obligations satisfied over time 279,491 3,283,850 285,125 1,850,133 332,798 1,340,408 ￦ 55,652,807 3,683,082 57,799,991 2,233,071 56,942,128 1,625,954

Selling and Administrative Ex_2

Selling and Administrative Expenses (Tables)	12 Months Ended
	Dec. 31, 2019
Selling, general and administrative expense [Abstract]
Selling and Administrative Expenses	Selling and administrative expenses for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 2018 2019 In millions of won Salaries ￦ 735,383 757,819 775,204 Retirement benefit expense 71,094 65,107 157,272 Welfare and benefit expense 179,406 132,089 120,463 Insurance expense 15,414 12,181 12,427 Depreciation 190,245 214,499 232,510 Amortization of intangible assets 44,990 54,153 76,547 Bad debt expense 126,714 39,784 (12,719 ) Commission 673,740 714,096 632,849 Advertising expense 114,519 30,894 34,453 Training expense 7,027 6,277 7,174 Vehicle maintenance expense 9,998 10,148 9,525 Publishing expense 3,672 3,307 3,414 Business promotion expense 3,700 2,785 3,038 Rent expense 38,380 42,851 40,505 Telecommunication expense 24,916 23,505 8,451 Transportation expense 495 686 865 Taxes and dues 48,395 46,424 58,666 Expendable supplies expense 7,731 6,166 6,682 Water, light and heating expense 10,545 12,629 11,867 Repairs and maintenance expense 63,477 62,580 88,576 Ordinary development expense 211,417 215,494 224,463 Travel expense 16,658 14,363 15,652 Clothing expense 8,410 10,108 9,369 Survey and analysis expense 698 705 848 Membership fee 1,122 1,043 969 Others 154,709 148,197 150,506 ￦ 2,762,855 2,627,890 2,669,576
Other selling and administrative expenses	Other selling and administrative expenses for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 2018 2019 In millions of won Accommodation development expenses ￦ 55,799 52,822 53,945 Miscellaneous wages 32,300 32,447 39,794 Litigation and filing expenses 11,881 12,853 21,768 Compensation for damages 12,297 19,193 (1,924 ) Outsourcing expenses 2,647 3,036 3,293 Reward expenses 2,786 2,713 2,858 Overseas market development expenses 1,876 1,361 1,997 Others 35,123 23,772 28,775 ￦ 154,709 148,197 150,506

Other Income and Expense (Table

Other Income and Expense (Tables)	12 Months Ended
	Dec. 31, 2019
Disclosure of other operating income (expense) [Abstract]
Other Income	Other income for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 2018 2019 In millions of won Reversal of other provisions ￦ 35,265 12,700 16,542 Reversal of other allowance for doubtful accounts 2,166 143 — Gains on government grants 430 482 281 Gains on assets contributed 4,218 17,336 6,921 Gains on liabilities exempted 3,166 10,303 916 Compensation and reparations revenue 89,196 89,901 113,292 Revenue from research contracts 12,580 6,818 5,276 Income related to transfer of assets from customers 478,973 594,548 604,808 Rental income 192,136 186,631 191,088 Others 50,988 51,032 58,849 ￦ 869,118 969,894 997,973
Details of others of other income	Details of “others” included in other income for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 2018 2019 In millions of won Refund of claim for rectification ￦ 9,655 8,933 1,969 Adjustment of research project 3,884 2,267 3,294 Maintenance expenses on lease building 135 176 153 Training expenses 3,045 3,220 3,167 Deposit redemption 34 7 436 Reversal of expenses on litigation 360 753 9,926 Revenue on royalty fee 2,888 6,909 — Reimbursement of insurance fee 1,498 7,145 610 Gains on guarantee contracts 456 39 135 Others 29,033 21,583 39,159 ￦ 50,988 51,032 58,849
Other Expense	Other expenses for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 2018 2019 In millions of won Compensation and indemnification expense ￦ 37 23,437 403 Accretion expenses of other provisions 7,535 41,924 7,939 Depreciation expenses on investment properties 1,176 923 5,069 Depreciation expenses on idle assets 6,644 6,547 6,542 Other bad debt expense 1,778 17,827 29,348 Donations 119,421 63,743 64,752 Others 43,464 76,929 127,860 ￦ 180,055 231,330 241,913
Details of others of other expense	Details of “others” included in other expenses for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 2018 2019 In millions of won Operating expenses related to the idle assets ￦ 136 47 49 Research grants 1,180 461 399 Supporting expenses on farming and fishing village 11,956 13,537 13,991 Operating expenses on fitness center 3,498 4,788 5,234 Expenses on adjustment of research and development grants 806 404 554 Taxes and dues 2,270 199 188 Expenses on R&D supporting 5,459 53 67 Others 18,159 57,440 107,378 ￦ 43,464 76,929 127,860

Other Gains (Losses) (Tables)

Other Gains (Losses) (Tables)	12 Months Ended
	Dec. 31, 2019
Other Gains (Losses) [Abstract]
Other Gains (Losses)	2017 2018 2019 In millions of won Other gains Gains on disposal of property, plant, and equipment ￦ 48,316 98,077 43,784 Gains on disposal of intangible assets 564 12 206 Reversal of impairment loss on property, plant and equipment — — 16,692 Reversal of impairment loss on intangible assets 54 17 — Gains on foreign currency translation 20,485 14,905 16,340 Gains on foreign currency transaction 93,151 47,297 53,152 Gains on insurance proceeds 400 — 17,410 Others 269,562 221,556 238,688 Other losses Losses on disposal of property, plant and equipment (70,514 ) (60,704 ) (72,508 ) Losses on disposal of intangible assets (183 ) (43 ) (827 ) Impairment loss on property, plant and equipment (51,067 ) (710,162 ) (50,034 ) Impairment loss on intangible assets (20 ) (8,112 ) (513,609 ) Impairment loss on other non-current — (87,024 ) (49,620 ) Losses on foreign currency translation (25,495 ) (7,678 ) (8,757 ) Losses on foreign currency transaction (36,241 ) (65,366 ) (55,283 ) Others (92,385 ) (63,899 ) (217,892 ) ￦ 156,627 (621,124 ) (582,258 )
Details of others of other gains	Details of “others” included in other gains for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 2018 2019 In millions of won Gains on disposal of inventories ￦ 6,024 6,350 3,424 Gains on proxy collection of TV license fee 39,711 40,450 41,013 Gains on compensation of impaired electric poles 1,526 1,166 1,372 Gains on compensation for infringement on contract 18,990 3,648 — Gains on harbor facilities dues 3,025 3,803 3,741 Gains on technical fees 2,105 2,026 3,044 Reversal of occupation development training fees 1,697 1,602 1,472 Gains on disposal of waste 4,261 4,232 5,317 Gains on insurance 10,410 22,382 812 Gains on tax rebate 2,161 542 341 Gains on other commission 4,790 4,347 1,111 Gains on disposal of assets held-for-sale — — 23,778 Others 174,862 131,008 153,263 ￦ 269,562 221,556 238,688
Details of others of other losses	2017 2018 2019 In millions of won Losses on valuation of inventories ￦ 3,875 1,953 3,127 Losses on disposal of inventories 3,273 3,555 10,456 Losses due to disaster 5,374 2,129 7,635 Losses on rounding adjustment of electric charge surtax 1,253 1,265 1,268 Losses on adjustments of levies 1 — — Forfeit of taxes and dues 656 — — Others 77,953 54,997 195,406 ￦ 92,385 63,899 217,892

Finance Income (Tables)

Finance Income (Tables)	12 Months Ended
	Dec. 31, 2019
Finance income [Abstract]
Finance Income	2017 2018 2019 In millions of won Interest income ￦ 206,143 223,767 268,118 Dividends income 11,477 12,777 13,838 Gains on disposal of financial assets 1,130 1,838 3,866 Gains on valuation of financial assets at fair value through profit or loss 12 8,495 5,575 Gains on valuation of derivatives 16,165 199,943 362,735 Gains on transaction of derivatives 29,257 179,745 157,961 Gains on foreign currency translation 1,115,832 143,254 175,839 Gains on foreign currency transactions 150,602 27,051 21,774 ￦ 1,530,618 796,870 1,009,706
Interest Income	Details of interest income included in finance income for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 2018 2019 In millions of won Cash and cash equivalents ￦ 35,474 40,704 42,861 Financial assets at fair value through profit or loss 290 21,713 29,411 Financial assets at amortized cost — 89 539 Held-to-maturity 82 — — Loans 30,014 21,925 63,448 Short-term financial instrument 29,412 41,025 49,070 Long-term financial instrument 8,144 7,920 12,794 Other financial assets — 1 54 Trade and other receivables 102,727 90,390 69,941 ￦ 206,143 223,767 268,118

Finance Expenses (Tables)

Finance Expenses (Tables)	12 Months Ended
	Dec. 31, 2019
Finance Expenses [Abstract]
Finance Expenses	Finance expenses for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 2018 2019 In millions of won Interest expense ￦ 1,789,552 1,868,458 2,046,811 Losses on sale of financial assets 2,343 1 2,106 Losses on valuation of financial assets at fair value through profit or loss — 6,616 4,513 Impairment of available-for-sale 2,713 — — Losses on valuation of derivatives 890,832 46,740 45,385 Losses on transaction of derivatives 198,218 32,448 71,546 Losses on foreign currency translation 207,944 393,859 553,731 Losses on foreign currency transaction 35,175 121,763 55,509 Losses on repayment of financial liabilities 5 — — Other 1,170 858 2,555 ￦ 3,127,952 2,470,743 2,782,156
Interest Expenses	2017 2018 2019 In millions of won Trade and other payables ￦ 57,160 42,830 94,019 Short-term borrowings 35,891 32,545 42,971 Long-term borrowings 87,011 92,243 119,806 Debt securities 1,698,232 1,771,544 1,827,511 Other financial liabilities 491,665 505,112 558,464 2,369,959 2,444,274 2,642,771 Less: Capitalized borrowing costs (580,407 ) (575,816 ) (595,960 ) ￦ 1,789,552 1,868,458 2,046,811 Capitalization rates for the years ended December 31, 2017, 2018 and 2019 are 2.30%~3.60%, 2.17%~3.86% and 2.37%~3.44%, respectively.

Income tax expense (Tables)

Income tax expense (Tables)	12 Months Ended
	Dec. 31, 2019
Income tax expense (benefit) [Abstract]
Income tax expense	2017 2018 2019 In millions of won Current income tax expense Payment of income tax ￦ 881,583 378,715 538,223 Adjustment in respect of prior years due to change in estimate 4,484 (195,648 ) (176,441 ) Current income tax directly recognized in equity (56,098 ) 101,528 (53,302 ) Effect of change in accounting policy — 1,780 — 829,969 286,375 308,480 Deferred tax expense Generation and realization of temporary differences 1,283,012 (495,658 ) (636,984 ) Changes of unrecognized tax losses, tax credit and temporary differences for prior periods 44,573 (28,509 ) (22,469 ) Changes in deferred tax on tax losses carryforwards — (572,305 ) (582,011 ) Tax credit carryforwards 15,270 (16,224 ) (71,306 ) Amount due to change in tax rate or regulations — — 1,987 1,342,855 (1,112,696 ) (1,310,783 ) Income tax expense (benefit) ￦ 2,172,824 (826,321 ) (1,002,303 )
Reconciliation between actual income tax expense and amount computed by applying the statutory tax rate	Reconciliation between actual income tax expense and amount computed by applying the statutory tax rate to income before income taxes for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 2018 2019 In millions of won Profit (loss) before income tax ￦ 3,614,218 (2,000,819 ) (3,265,838 ) Income tax expense (benefit) computed at applicable tax rate(*1) 874,641 (550,225 ) (898,105 ) Adjustments Effect of applying gradual tax rate (5,082 ) (1,408 ) 10,362 Effect of non-taxable (32,032 ) (1,705 ) (9,990 ) Effect of non-deductible 15,032 40,151 12,197 Effect of tax losses that are not recognized as deferred tax asset — 2,086 57,490 Effects of tax credits and deduction (161,069 ) (39,471 ) (76,983 ) Recognition (reversal) of unrecognized deferred tax asset, net 44,573 (28,509 ) (22,469 ) Effect of change in deferred tax due to change in tax rate 1,055,154 261 16,848 Deferred tax related to investments in subsidiaries and associates 394,145 (52,618 ) 147,598 Others, net (17,022 ) 765 (62,810 ) 1,293,699 (80,448 ) 72,243 Adjustment in respect of prior years due to change in estimate 4,484 (195,648 ) (176,440 ) Income tax expense (benefit) ￦ 2,172,824 (826,321 ) (1,002,302 ) Effective tax rate 60 % (*2 ) (*2 ) (*1) Applicable tax rate is 24.2% as of December 31, 2017, and 27.5% as of December 31, 2018 and 2019. (*2) The effective tax rate for the year ended December 31, 2018 and 2019 is not calculated for income tax benefit.
Income tax directly adjusted to shareholders' equity (except for accumulated other comprehensive income (loss))	Income tax directly adjusted to shareholders’ equity (except for accumulated other comprehensive income (loss)) for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 2018 2019 In millions of won Dividends of hybrid bond ￦ 5,248 4,273 3,432 Effect of change in effective tax rate (25 ) — — ￦ 5,223 4,273 3,432
Income tax recognized as other comprehensive income (loss)	Income tax recognized as other comprehensive income (loss) for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 2018 2019 In millions of won Income tax recognized as other comprehensive income (loss) Gain (loss) on valuation of financial assets at fair value through other comprehensive income ￦ — 35,798 (4,217 ) Loss on valuation of available-for-sale (2,551 ) — — Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax (11,016 ) 6,639 (15,642 ) Remeasurement of defined benefit obligations (80,645 ) 53,703 (40,235 ) Investments in associates 8,649 6,592 4,275 Others 24,242 (5,477 ) (914 ) ￦ (61,321 ) 97,255 (56,733 )
Changes in deferred income tax assets (liabilities)	Changes in deferred tax assets (liabilities) recognized in the statements of financial position for the years ended December 31, 2018 and 2019 are as follows: 2018 Beginning balance Amounts Amount Amounts recognized directly in equity Ending balance In millions of won Deferred tax on temporary differences Employee benefits ￦ 498,694 42,144 53,703 — 594,541 Cash flow hedge 65,445 (32,623 ) 6,639 — 39,461 Investments in associates or subsidiaries (8,668,016 ) (5,447 ) 6,592 — (8,666,871 ) Property, plant and equipment (6,860,440 ) 337,662 — — (6,522,778 ) Finance lease (426,949 ) (26,125 ) — — (453,074 ) Intangible assets 7,648 (1,593 ) — — 6,055 Financial assets at fair value through profit or loss 890 (871 ) — — 19 Financial assets at fair value through other comprehensive income (8,843 ) (1,379 ) 35,798 — 25,576 Deferred revenue 230,711 (10,969 ) — — 219,742 Provisions 4,822,833 (21,887 ) — — 4,800,946 Doubtful receivables 59 — — — 59 Other finance liabilities 32,755 2,465 — 4,273 39,493 Gains or losses on foreign exchange translation (1,354 ) 28,434 — — 27,080 Allowance for doubtful accounts 42,931 15,825 — — 58,756 Accrued income (1,825 ) (1,089 ) — — (2,914 ) Special deduction for property, plant and equipment (200,927 ) (10,819 ) — — (211,746 ) Reserve for research and human development (3,041 ) 3,041 — — — Others 952,754 105,869 (5,477 ) — 1,053,146 (9,516,675 ) 422,638 97,255 4,273 (8,992,509 ) Deferred tax on unused tax losses and tax credit Unused tax losses — 554,457 — — 554,457 Excess of donation limit — 17,848 — — 17,848 Tax credit 20,431 16,225 — — 36,656 20,431 588,530 — — 608,961 ￦ (9,496,244 ) 1,011,168 97,255 4,273 (8,383,548 ) 2019 Beginning balance Amounts Amount Amounts recognized directly in equity Others(*) Ending balance In millions of won Deferred tax on temporary differences Employee benefits ￦ 594,541 94,541 (40,235 ) — — 648,847 Cash flow hedge 39,461 (23,977 ) (15,642 ) (841 ) — (999 ) Investments in associates or subsidiaries (8,666,871 ) (3,131 ) 4,275 — — (8,665,727 ) Property, plant and equipment (6,522,778 ) (592,440 ) — — — (7,115,218 ) Finance lease (453,074 ) 292,631 — — — (160,443 ) Intangible assets 6,055 (20,232 ) — — (41,729 ) (55,906 ) Financial assets at fair value through profit or loss 19 322 — — — 341 Financial assets at fair value through other comprehensive income 25,576 (3,114 ) (4,217 ) — — 18,245 Deferred revenue 219,742 (6,739 ) — — — 213,003 Provisions 4,800,946 655,973 — — — 5,456,919 Doubtful receivables 59 — — — — 59 Other finance liabilities 39,493 (4,402 ) — 4,273 — 39,364 Gains or losses on foreign exchange translation 27,080 30,881 — — — 57,961 Allowance for doubtful accounts 58,756 (1,149 ) — — — 57,607 Accrued income (2,914 ) (1,462 ) — — — (4,376 ) Special deduction for property, plant and equipment (211,746 ) (3,627 ) — — — (215,373 ) Others 1,053,146 290,484 (914 ) — — 1,342,716 (8,992,509 ) 704,559 (56,733 ) 3,432 (41,729 ) (8,382,980 ) Deferred tax on unused tax losses and tax credit Unused tax losses 554,457 557,356 — — — 1,111,813 Excess of donation limit 17,848 18,847 — — — 36,695 Tax credit 36,656 70,870 — — — 107,526 608,961 647,073 — — — 1,256,034 ￦ (8,383,548 ) 1,351,632 (56,733 ) 3,432 (41,729 ) (7,126,946 ) (*) ‘Others’ include amount changed due to business combination. (see Note 51)
Deferred income tax assets (liabilities)	2018 2019 In millions of won Deferred tax assets ￦ 1,233,761 1,437,829 Deferred tax liabilities (9,617,309 ) (8,564,775 ) ￦ (8,383,548 ) (7,126,946 )
Details of deductible temporary differences, tax losses and unused tax credits for which no deferred income tax assets were recognized	Details of deductible temporary differences, tax losses and unused tax credits for which no deferred tax assets were recognized as of December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Deductible temporary differences ￦ 442,391 541,449

Assets Held-for-Sale (Tables)

Assets Held-for-Sale (Tables)	12 Months Ended
	Dec. 31, 2019
Assets Held-for-Sale [Abstract]
Assets Held-for-Sale	Assets held-for-sale 2018 2019 In millions of won Land(*1) ￦ 2,765 23,002 Building(*1) 19,369 193 Investments(*2, 3, 4) 747 4,921 ￦ 22,881 28,116 (*1) The board of directors of KEPCO Engineering & Construction Company, Inc., a subsidiary of the Company, determined to dispose the premises in Yongin as part of the government’s plan to relocate state-run held-for-sale. held-for-sale (*2) Ulleungdo Natural Energy Co., Ltd. was in the process of liquidating its business as of December 31, 2019 and has been reclassified to assets held-for-sale, (*3) Garolim Tidal Power Plant Co., Ltd. was in the process of liquidating its business as of December 31, 2019 and has been reclassified to assets held-for-sale, (*4) As of December 31, 2018, the Company reclassified investment of its subsidiary, KOWEPO India Private Limited, as assets held-for-sale due to the decision to liquidate the company. The liquidation process was completed during the year ended December 31, 2019.

Expenses Classified by Nature (

Expenses Classified by Nature (Tables)	12 Months Ended
	Dec. 31, 2019
Expenses Classified by Nature [Abstract]
Expenses Classified by Nature	Expenses classified by nature for the years ended December 31, 2017, 2018 and 2019 are as follows: 2017 Selling and Cost of sales Total In millions of won Raw materials used ￦ — 15,924,707 15,924,707 Salaries 735,383 3,479,591 4,214,974 Retirement benefit expense 71,094 397,852 468,946 Welfare and benefit expense 179,406 543,738 723,144 Insurance expense 15,414 90,677 106,091 Depreciation 190,245 9,461,974 9,652,219 Amortization of intangible assets 44,990 68,682 113,672 Bad debt expense 126,714 — 126,714 Commission 673,740 469,695 1,143,435 Advertising expense 114,519 10,917 125,436 Training expense 7,027 14,362 21,389 Vehicle maintenance expense 9,998 7,468 17,466 Publishing expense 3,672 4,248 7,920 Business promotion expense 3,700 4,973 8,673 Rent expense 38,380 148,509 186,889 Telecommunication expense 24,916 73,956 98,872 Transportation expense 495 9,145 9,640 Taxes and dues 48,395 437,643 486,038 Expendable supplies expense 7,731 31,994 39,725 Water, light and heating expense 10,545 30,150 40,695 Repairs and maintenance expense 63,477 2,047,943 2,111,420 Ordinary development expense 211,417 510,020 721,437 Travel expense 16,658 69,015 85,673 Clothing expense 8,410 4,985 13,395 Survey and analysis expense 698 3,661 4,359 Membership fee 1,122 8,482 9,604 Power purchase — 14,264,331 14,264,331 Others 154,709 3,980,137 4,134,846 ￦ 2,762,855 52,098,855 54,861,710 2018 Selling and Cost of sales Total In millions of won Raw materials used ￦ — 19,537,928 19,537,928 Salaries 757,819 3,478,804 4,236,623 Retirement benefit expense 65,107 375,505 440,612 Welfare and benefit expense 132,089 464,483 596,572 Insurance expense 12,181 93,876 106,057 Depreciation 214,499 9,683,887 9,898,386 Amortization of intangible assets 54,153 64,785 118,938 Bad debt expense 39,784 — 39,784 Commission 714,096 475,188 1,189,284 Advertising expense 30,894 9,419 40,313 Training expense 6,277 14,096 20,373 Vehicle maintenance expense 10,148 7,809 17,957 Publishing expense 3,307 3,530 6,837 Business promotion expense 2,785 3,860 6,645 Rent expense 42,851 171,132 213,983 Telecommunication expense 23,505 82,568 106,073 Transportation expense 686 4,537 5,223 Taxes and dues 46,424 440,317 486,741 Expendable supplies expense 6,166 31,844 38,010 Water, light and heating expense 12,629 34,640 47,269 Repairs and maintenance expense 62,580 2,156,668 2,219,248 Ordinary development expense 215,494 508,394 723,888 Travel expense 14,363 67,064 81,427 Clothing expense 10,108 4,368 14,476 Survey and analysis expense 705 3,929 4,634 Membership fee 1,043 11,563 12,606 Power purchase — 18,307,289 18,307,289 Others 148,197 2,170,238 2,318,435 ￦ 2,627,890 58,207,721 60,835,611 2019 Selling and Cost of sales Total In millions of won Raw materials used ￦ — 17,084,029 17,084,029 Salaries 775,204 3,834,772 4,609,976 Retirement benefit expense 157,272 652,467 809,739 Welfare and benefit expense 120,463 443,482 563,945 Insurance expense 12,427 93,702 106,129 Depreciation 232,510 10,734,246 10,966,756 Amortization of intangible assets 76,547 80,368 156,915 Bad debt expense (12,719 ) — (12,719 ) Commission 632,849 378,861 1,011,710 Advertising expense 34,453 9,852 44,305 Training expense 7,174 16,903 24,077 Vehicle maintenance expense 9,525 7,652 17,177 Publishing expense 3,414 3,423 6,837 Business promotion expense 3,038 3,981 7,019 Rent expense 40,505 176,413 216,918 Telecommunication expense 8,451 11,034 19,485 Transportation expense 865 4,555 5,420 Taxes and dues 58,666 481,684 540,350 Expendable supplies expense 6,682 32,999 39,681 Water, light and heating expense 11,867 32,378 44,245 Repairs and maintenance expense 88,576 2,210,278 2,298,854 Ordinary development expense 224,463 511,252 735,715 Travel expense 15,652 68,581 84,233 Clothing expense 9,369 7,539 16,908 Survey and analysis expense 848 3,949 4,797 Membership fee 969 12,730 13,699 Power purchase — 18,269,732 18,269,732 Others 150,506 2,612,973 2,763,479 ￦ 2,669,576 57,779,835 60,449,411

Earnings per share (Tables)

Earnings per share (Tables)	12 Months Ended
	Dec. 31, 2019
Earnings per share [Abstract]
Basic earnings per share	Basic earnings (loss) per share for the years ended December 31, 2017, 2018 and 2019 are as follows: Type 2017 2018 2019 In won Basic earnings (loss) per share ￦ 2,023 (2,048 ) (3,654 )
Diluted earnings per share	Diluted earnings (loss) per share for the years ended December 31, 2017, 2018 and 2019 are as follows: Type 2017 2018 2019 In won Diluted earnings (loss) per share ￦ 2,023 (2,048 ) (3,654 )
Calculation of Basic earnings per share	Net profit (loss) for the period and weighted average number of common shares used in the calculation of basic earnings (loss) per share for the years ended December 31, 2017, 2018 and 2019 are as follows: Type 2017 2018 2019 In millions of won except number of shares Net profit (loss) attributable to controlling interest ￦ 1,298,720 (1,314,567 ) (2,345,517 ) Profit (loss) used in the calculation of total basic earnings (loss) per share 1,298,720 (1,314,567 ) (2,345,517 ) Weighted average number of common shares 641,964,077 641,964,077 641,964,077
Calculation of Diluted earnings per share	Earnings (loss) used in the calculation of total diluted earnings per share for the years ended December 31, 2017, 2018 and 2019 are as follows: Type 2017 2018 2019 In millions of won Profit (loss) used in the calculation of total diluted earnings (loss) per share ￦ 1,298,720 (1,314,567 ) (2,345,517 ) Weighted average common shares used in calculating diluted earnings (loss) per share are adjusted from weighted average common shares used in calculating basic earnings (loss) per share. Detailed information of the adjustment for the years ended December 31, 2017, 2018 and 2019 are as follows: Type 2017 2018 2019 In number of shares Weighted average number of common shares 641,964,077 641,964,077 641,964,077 Diluted weighted average number of shares 641,964,077 641,964,077 641,964,077

Risk Management (Tables)

Risk Management (Tables)	12 Months Ended
	Dec. 31, 2019
Risk Management [Abstract]
Capital risk management	Capital risk management The Company manages its capital to ensure that entities in the Company will be able to continue while maximizing the return to shareholder through the optimization of the debt and equity balance. The capital structure of the Company consists of net debt (offset by cash and cash equivalents) and equity. The Company’s overall capital risk management strategy remains consistent with the prior year. Details of the Company’s capital management accounts as of December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Total borrowings and debt securities ￦ 61,034,627 67,876,541 Cash and cash equivalents 1,358,345 1,810,129 Net borrowings and debt securities 59,676,282 66,066,412 Total shareholders’ equity 71,092,762 68,889,649 Debt to equity ratio 83.94 % 95.90 %
Credit risk management	Book values of the financial assets represent the maximum exposed amounts of the credit risk. Details of the Company’s level of maximum exposure to credit risk as of December 31, 2018 and 2019 are as follows: 2018 2019 In millions of won Cash and cash equivalents ￦ 1,358,345 1,810,129 Financial assets at fair value through profit or loss 920,935 747,261 Derivative assets (trading) 37,631 165,204 Financial assets at amortized cost 14,042 13,609 Loans 718,674 738,707 Long-term/short-term financial instruments 2,318,027 1,960,227 Derivative assets (applying hedge accounting) 64,704 145,829 Trade and other receivables 9,613,437 9,703,749 Financial guarantee contracts(*) 1,310,817 3,338,566 (*) Maximum exposure associated with the financial guarantee contracts is the maximum amounts of the obligation.
Sensitivity analysis of Defined benefit obligation	A sensitivity analysis of defined benefit obligation assuming a 1% increase and decrease movements in the actuarial valuation assumptions as of December 31, 2018 and 2019 are as follows: 2018 2019 Type Accounts 1% Increase 1% Decrease 1% Increase 1% Decrease In millions of won Future salary increases Increase (decrease) in defined benefit obligation ￦ 416,956 (363,820 ) 442,748 (386,147 ) Discount rate Increase (decrease) in defined benefit obligation (377,221 ) 445,833 (402,099 ) 475,765 Changes of employee benefits assuming a 1% increase and decrease movements in discount rate on plan asset for the years ended December 31, 2018 and 2019 are ￦14,646 million and ￦17,734 million, respectively.
Changes in provisions due to movements in underlying assumptions	Changes in provisions due to movements in underlying assumptions as of December 31, 2018 and 2019 are as follows: Type Accounts 2018 2019 PCBs Inflation rate 1.27 % 1.09 % Discount rate 2.18 % 1.97 % Nuclear plants Inflation rate 1.21 % 1.10 % Discount rate 2.94 % 2.43 % Spent fuel Inflation rate 2.93 % 2.93 % Discount rate 4.49 % 4.49 %
Sensitivity analysis of Provisions due to movements in underlying assumptions	A sensitivity analysis of provisions assuming a 0.1% increase and decrease movements in the underlying assumptions as of December 31, 2018 and 2019 are as follows: 2018 2019 Type Accounts 0.1% Increase 0.1% Decrease 0.1% Increase 0.1% Decrease In millions of won Discount rate PCBs ￦ (623 ) 627 (527 ) 530 Nuclear plants (256,513 ) 263,595 (316,184 ) 325,828 Spent fuel (49,182 ) 51,098 (51,607 ) 53,621 Inflation rate PCBs 632 (629 ) 534 (532 ) Nuclear plants 294,984 (287,110 ) 346,082 (336,182 ) Spent fuel 51,837 (49,961 ) 54,396 (52,424 )
Foreign currency risk	The Company undertakes transactions denominated in foreign currencies; consequently, exposures to exchange rate fluctuations arise. The carrying amounts of the Company’s foreign currency denominated monetary assets and monetary liabilities as of December 31, 2018 and 2019 are as follows: Assets Liabilities Type 2018 2019 2018 2019 In thousands of foreign currencies AED 10,513 57,403 5,890 40,061 AUD 143 143 717,712 1,036,785 BDT 71,575 85,547 1,175 635 BWP 1,214 1,437 — — CAD 96 86 4 3,112 CHF — — 400,000 500,753 CNY — — 26,140 26,140 CZK — — — 243 EUR 337 208 105,673 111,199 GBP — — 1 191 GHS 25,794 — — — HKD — — 1,650,000 1,648,815 IDR 60,568 376,136 206,935 219,801 INR 1,228,795 1,244,170 183,963 210,232 JOD 2,764 1,516 5 147 JPY 35,935 109,970 390,921 314,402 KZT 319 319 — — MGA 3,318,447 3,858,201 170,641 133,403 MMK 25,208 29,651 — — PHP 709,285 175,210 66,985 130,073 PKR 305,542 354,361 3,588 4,366 SAR 2,024 2,653 — 480 SEK — — 450,000 449,072 USD 1,422,510 1,227,054 8,103,602 9,963,928 UYU 39,898 58,781 4,253 8,213 VND — 418,998 — 1,375 ZAR 170 450 4 6
Sensitivity analysis of Foreign currency risk	A sensitivity analysis on the Company’s income for the period assuming a 10% increase and decrease in currency exchange rates as of December 31, 2018 and 2019 are as follows: 2018 2019 Type 10% Increase 10% Decrease 10% Increase 10% Decrease In millions of won Increase (decrease) of profit before income tax ￦ (887,561 ) 887,561 (1,197,530 ) 1,197,530 Increase (decrease) of shareholder’s equity(*) (887,561 ) 887,561 (1,197,530 ) 1,197,530 (*) The effect on the shareholders’ equity excluding the impact of income taxes.
Interest rate risk	The Company’s borrowings and debt securities with floating interest rates as of December 31, 2018 and 2019 are as follows: Type 2018 2019 In millions of won Short-term borrowings ￦ 24,235 — Long-term borrowings 2,358,860 2,273,579 Debt securities — 243,102 ￦ 2,383,095 2,516,681
Sensitivity analysis of Interest rate risk	A sensitivity analysis on the Company’s long-term borrowings and debt securities assuming a 1% increase and decrease in interest rates, without consideration of hedge effect of related derivatives for the years ended December 31, 2018 and 2019 are as follows: 2018 2019 Type 1% Increase 1% Decrease 1% Increase 1% Decrease In millions of won Increase (decrease) of profit before income tax ￦ (23,831 ) 23,831 (25,167 ) 25,167 Increase (decrease) of shareholder’s equity(*) (23,831 ) 23,831 (25,167 ) 25,167 (*) The effect on the shareholders’ equity excluding the impact of income taxes.
Electricity rates risk	A sensitivity analysis on the Company’s income for the period assuming a 1% increase and decrease in price of electricity for the years ended December 31, 2018 and 2019 are as follows: 2018 2019 Type 1% Increase 1% Decrease 1% Increase 1% Decrease In millions of won Increase (decrease) of profit before income tax ￦ 568,420 (568,420 ) 559,390 (559,390 ) Increase (decrease) of shareholder’s equity(*) 568,420 (568,420 ) 559,390 (559,390 ) (*) The effect on the shareholders’ equity excluding the impact of income taxes.
Details of maturities of non-derivative financial liabilities	The following table shows the details of maturities of non-derivative non-derivative 2018 Type Less than 1 year 1~2 Years 2~5 Years More than 5 years Total In millions of won Borrowings and debt securities ￦ 10,204,471 9,274,378 28,143,311 25,312,534 72,934,694 Finance lease liabilities 87,709 87,709 141,074 65,250 381,742 Trade and other payables 6,348,195 150,479 375,661 2,188,950 9,063,285 Financial guarantee contracts(*) 91,722 855,488 363,607 — 1,310,817 ￦ 16,732,097 10,368,054 29,023,653 27,566,734 83,690,538 2019 Type Less than 1 year 1~2 Years 2~5 Years More than 5 years Total In millions of won Borrowings and debt securities ￦ 10,660,737 10,997,510 27,881,873 30,859,669 80,399,789 Lease liabilities 686,445 617,449 1,717,434 2,735,681 5,757,009 Trade and other payables 6,014,054 382,809 971,469 1,176,697 8,545,029 Financial guarantee contracts(*) 937,091 302,186 32,314 2,066,975 3,338,566 ￦ 18,298,327 12,299,954 30,603,090 36,839,022 98,040,393 (*) This represents the total guarantee amounts associated with the financial guarantee contracts. Financial guarantee liabilities which are recognized as of December 31, 2018 and 2019 are ￦15,586 million and ￦81,357 million, respectively.
The expected maturities for non-derivative financial assets	The expected maturities for non-derivative 2018 Type Less than 1 year 1~5 Years More than 5 years Other(*) Total In millions of won Cash and cash equivalents ￦ 1,358,345 — — — 1,358,345 Financial assets at fair value through other comprehensive income — — — 399,495 399,495 Financial assets at amortized cost 11,956 2,086 — — 14,042 Loans 123,646 314,744 319,988 — 758,378 Long-term/short-term financial instruments 1,869,286 278,899 164,057 5,785 2,318,027 Financial assets at fair value through profit or loss 313,893 81,828 483,398 41,816 920,935 Trade and other receivables 7,795,619 1,067,800 701,743 57,651 9,622,813 ￦ 11,472,745 1,745,357 1,669,186 504,747 15,392,035 2019 Type Less than 1 year 1~5 Years More than 5 years Other(*) Total In millions of won Cash and cash equivalents ￦ 1,810,129 — — — 1,810,129 Financial assets at fair value through other comprehensive income — — — 379,170 379,170 Financial assets at amortized cost 12,302 1,307 — — 13,609 Loans 64,081 346,583 336,502 27,606 774,772 Long-term/short-term financial instruments 1,351,971 269,863 — 338,393 1,960,227 Financial assets at fair value through profit or loss 131,385 79 — 615,797 747,261 Trade and other receivables 7,703,746 980,951 818,431 207,979 9,711,107 ￦ 11,073,614 1,598,783 1,154,933 1,568,945 15,396,275 (*) The maturities cannot be presently determined.
Derivative liabilities classified by maturity periods which from reporting date to maturity date of contract	Derivative liabilities classified by maturity periods which from reporting date to maturity dates as per the contracts as of December 31, 2018 and 2019 are as follows: 2018 Type Less than 1 year 1~2 Years 2~5 Years More than 5 years Total In millions of won Net settlement —Trading ￦ — — — — — Gross settlement —Trading 5,734 16,565 28,283 40,124 90,706 —Hedging 5,154 (43,447 ) 71,840 (40,917 ) (7,370 ) ￦ 10,888 (26,882 ) 100,123 (793 ) 83,336 2019 Type Less than 1 year 1~2 Years 2~5 Years More than 5 years Total In millions of won Net settlement —Trading ￦ (3,017 ) — — — (3,017 ) Gross settlement —Trading (15,011 ) (8,295 ) (39,654 ) 4,235 (58,725 ) —Hedging (59,846 ) (21,466 ) (1,914 ) (33,588 ) (116,814 ) ￦ (77,874 ) (29,761 ) (41,568 ) (29,353 ) (178,556 )
Fair value and book value of financial assets and liabilities	Fair value and book value of financial assets and liabilities as of December 31, 2018 and 2019 are as follows: 2018 2019 Type Book value Fair value Book value Fair value In millions of won Assets recognized at fair value Financial assets at fair value through other comprehensive income ￦ 399,495 399,495 379,170 379,170 Derivative assets (trading) 37,631 37,631 165,204 165,204 Derivative assets (applying hedge accounting) 64,704 64,704 145,829 145,829 Financial assets at fair value through profit or loss 920,935 920,935 747,261 747,261 ￦ 1,422,765 1,422,765 1,437,464 1,437,464 Assets carried at amortized cost Financial assets at amortized cost ￦ 14,042 14,042 13,609 13,609 Loans and receivables 718,674 718,674 738,707 738,707 Long-term financial instruments 448,741 448,741 608,256 608,256 Short-term financial instruments 1,869,286 1,869,286 1,351,971 1,351,971 Trade and other receivables 9,613,437 9,613,437 9,703,749 9,703,749 Cash and cash equivalents 1,358,345 1,358,345 1,810,129 1,810,129 ￦ 14,022,525 14,022,525 14,226,421 14,226,421 Liabilities recognized at fair value Derivative liabilities (trading) ￦ 99,010 99,010 53,147 53,147 Derivative liabilities (applying hedge accounting) 213,153 213,153 116,813 116,813 ￦ 312,163 312,163 169,960 169,960 Liabilities carried at amortized cost Secured borrowings ￦ 741,029 741,029 227,135 227,135 Unsecured bond 56,603,988 58,804,070 63,171,664 66,917,421 Lease liabilities — — 5,070,133 5,070,133 Finance lease liabilities 283,806 283,806 — — Unsecured borrowings 3,522,602 3,950,517 4,104,523 4,113,955 Trade and other payables(*) 9,063,285 9,063,285 8,545,029 8,545,029 Bank overdraft 167,008 167,008 373,219 373,219 ￦ 70,381,718 73,009,715 81,491,703 85,246,892 (*) Excludes lease liabilities (current year) and finance lease liabilities (prior year)
Interest rates used for determining fair value	The discount rate used for calculating fair value as of December 31, 2018 and 2019 are as follows: Type 2018 2019 Derivatives 0.02% ~ 4.16% 0.01% ~ 4.16% Borrowings and debt securities 0.51% ~ 5.14% 0.17% ~ 3.90% Lease 3.50% ~ 10.83% 1.38% ~ 10.83%
Fair value hierarchy	Fair values of financial instruments by hierarchy level as of December 31, 2018 and 2019 are as follows: 2018 Type Level 1 Level 2 Level 3 Total In millions of won Financial assets at fair value Financial assets at fair value through other comprehensive income ￦ 210,056 — 189,439 399,495 Derivative assets — 100,490 1,845 102,335 Financial assets at fair value through profit or loss 106,600 809,283 5,052 920,935 ￦ 316,656 909,773 196,336 1,422,765 Financial liabilities at fair value Derivative liabilities ￦ — 310,008 2,155 312,163 2019 Type Level 1 Level 2 Level 3 Total In millions of won Financial assets at fair value Financial assets at fair value through other comprehensive income ￦ 201,202 — 177,968 379,170 Derivative assets — 308,399 2,634 311,033 Financial assets at fair value through profit or loss — 742,105 5,156 747,261 ￦ 201,202 1,050,504 185,758 1,437,464 Financial liabilities at fair value Derivative liabilities ￦ — 169,960 — 169,960
Changes of financial assets and liabilities which are classified as level 3	Changes of financial assets and liabilities which are classified as level 3 for the years ended December 31, 2018 and 2019 are as follows: 2018 Beginning Effect of Acquisition Reclassified Valuation Disposal Foreign Ending In millions of won Financial assets at fair value Financial assets at fair value through profit or loss Cooperative ￦ — 5,038 — — 14 — — 5,052 Financial assets at fair Unlisted securities — 197,450 — — (11,744 ) (326 ) 4,059 189,439 2019 Beginning Effect of Acquisition Reclassified Valuation Disposal Foreign Ending In millions of won Financial assets at fair value Financial assets at fair value through profit or loss Cooperative ￦ 5,052 — 40 — 64 — — 5,156 Financial assets at fair value through other comprehensive income Unlisted securities 189,439 — 1,876 — 3,715 (19,315 ) 2,253 177,968

Service Concession Arrangemen_2

Service Concession Arrangements (Tables)	12 Months Ended
	Dec. 31, 2019
Service Concession Arrangements [Abstract]
Gas Complex Thermal Power Plant at Ilijan, Philippines	The Company’s expected future collections of service concession arrangements as of December 31, 2019 are as follows: Type Amounts In millions of won Less than 1 year ￦ 120,937 1~ 2 years 120,937 2~ 3 years 50,390 ￦ 292,264
Hydroelectric Power Generation at Semangka, Indonesia	The Company’s expected future collections of service concession arrangements as of December 31, 2019 are as follows: Type Amounts In millions of won Less than 1 year ￦ 28,921 1~ 2 years 28,853 2~ 3 years 28,885 Over 3 years 587,972 ￦ 674,631

Related parties (Tables)

Related parties (Tables)	12 Months Ended
	Dec. 31, 2019
Related Parties [Abstract]
Related Party Transactions	Related party transactions for the years ended December 31, 2017, 2018 and 2019 are as follows: <Sales and Others> Sales and others Company name Transaction type 2017 2018 2019 In millions of won <Associates> Dongducheon Dream Power Co., Ltd. Electricity sales ￦ 17,041 6,093 7,071 Korea Gas Corporation Electricity sales 88,011 99,933 116,484 Daejung Offshore Wind Power Co., Ltd. Electricity sales 1 1 1 Daegu Photovoltaic Co., Ltd. Electricity sales 349 128 327 KS Solar Co., Ltd. Electricity sales 5 — — Heang Bok Do Si Photovoltaic Power Co., Ltd. Electricity sales 2 2 2 Korea Electric Power Industrial Development Co., Ltd. Service 14,044 10,422 11,085 Goseong Green Energy Co., Ltd. Electricity sales 24,069 10,024 19,245 Gangneung Eco Power Co., Ltd. Service 2,391 4,928 7,446 Shin Pyeongtaek Power Co., Ltd. Electricity sales 9,025 8,468 21,218 Naepo Green Energy Co., Ltd. Electricity sales 185 160 154 Noeul Green Energy Co., Ltd. Electricity sales 32 30 30 Samcheok Eco Materials Co., Ltd. Electricity sales 237 605 627 YTN Co., Ltd. Electricity sales 1,987 2,043 2,257 Busan Green Energy Co., Ltd. Electricity sales 120 19 18 Gunsan Bio Energy Co., Ltd. Electricity sales — 3,611 4,755 Korea Electric Vehicle Charging Service Electricity sales 700 578 1,029 Tamra Offshore Wind Power Co., Ltd. Electricity sales ￦ 55 58 — Daegu clean Energy Co., Ltd. Electricity sales 421 126 — Cheongna Energy Co., Ltd. Service 7,980 11,688 9,922 Gangwon Wind Power Co., Ltd. Electricity sales 994 2,402 2,433 Gwangyang Green Energy Co., Ltd. Electricity sales — 874 122 Hyundai Green Power Co., Ltd. Design service 14,280 14,031 13,106 Korea Power Exchange Service 8,446 6,854 7,670 Hyundai Energy Co., Ltd. Service 15,627 1,718 3,437 Taebaek Wind Power Co., Ltd. Service 813 614 991 Taeback Guinemi Wind Power Co., Ltd. Electricity sales — — 77 Pyeongchang Wind Power Co., Ltd. Design service 1,176 1,166 1,189 Daeryun Power Co., Ltd. Electricity sales 1,796 1,731 1,879 Changjuk Wind Power Co., Ltd. Electricity sales 788 758 927 GS Donghae Power Co., Ltd. Electricity sales 11,204 7,238 15,792 KNH Solar Co., Ltd. Electricity sales 17 17 17 S-Power Service 12,852 9,118 6,535 PND solar Co., Ltd Electricity sales — 12 407 Hyundai Ecoenergy Co., Ltd. Electricity sales — — 117 YeongGwang Yaksu Wind Electric. Co., Ltd. Electricity sales — — 81 Korea Energy Solution Co., Ltd. Electricity sales — — 52 Suwon New Power Co., Ltd. Electricity sales — — 5,606 9 Associates (Overseas) Electricity sales and others 21,864 60,318 98,450 <Joint ventures> Daegu Green Power Co., Ltd. Electricity sales 1,131 1,022 1,151 KAPES, Inc. Commission 1,420 648 504 Dangjin Eco Power Co., Ltd. Technical fee 670 3,424 4 Honam Wind Power Co., Ltd. Electricity sales 552 415 657 Jeongam Wind Power Co., Ltd. Electricity sales 30 724 1,198 Korea Power Engineering Service Co., Ltd. Service 1,317 840 348 Seokmun Energy Co., Ltd. Service 1,765 1,897 1,495 Incheon New Power Co., Ltd. Construction revenue 539 568 354 Chun-cheon Energy Co., Ltd. Electricity sales 4,855 2,471 2,397 Yeonggwangbaeksu Wind Power Co., Ltd. Electricity sales 1,654 1,540 1,744 Yeonggwang Wind Power Co., Ltd. Electricity sales — 46 705 KW Nuclear Components Co., Ltd. Service 644 839 721 KEPCO-Uhde Inc. Service 34 17 15 Busan Shinho Solar Power Co., Ltd. Electricity sales 87 362 452 Daesan Green Energy Co., Ltd. Electricity sales — — 39 Cheong-Song Noraesan Wind Power Co., Ltd. Electricity sales — — 6 Saemangeum Solar Power Co., Ltd. Service — — 2,230 Jaeun Resident Wind Power Plant Co., Ltd. Electricity sales — — 105 25 Joint ventures (Overseas) Electricity sales and others 131,343 206,054 1,275,279 <Others> Yeongwol Energy Station Co., Ltd. Service 830 373 — DS POWER Co., Ltd. Service 5,819 565 — Ulleungdo Natural Energy Co., Ltd. Service 1,013 292 — Korea Development Bank Electricity sales 3,239 3,524 3,948 Interest income 1,685 4,438 2,091 <Purchase and Others> Purchase and others Company name Transaction type 2017 2018 2019 In millions of won <Associates> Dongducheon Dream Power Co., Ltd. Electricity purchase ￦ 813,440 828,547 689,510 Korea Gas Corporation Purchase of power generation 3,245,519 5,191,243 4,049,486 Daegu Photovoltaic Co., Ltd. REC purchase 3,646 3,745 3,626 KS Solar Co., Ltd. REC purchase 900 — — Heang Bok Do Si Photovoltaic Power Co., Ltd. Rental fee and others 570 455 450 Korea Electric Power Industrial Development Co., Ltd. Electricity metering service 289,293 261,668 245,057 Goseong Green Energy Co., Ltd. Electricity purchase — — 32 Gangneung Eco Power Co., Ltd. Service — 19 — Shin Pyeongtaek Power Co., Ltd. Electricity purchase — — 119,162 Noeul Green Energy Co., Ltd. REC purchase 15,862 18,282 22,767 Samcheok Eco Materials Co., Ltd. Electricity purchase 14 3,819 9,425 YTN Co., Ltd. Electricity purchase 731 322 333 Busan Green Energy Co., Ltd. Electricity purchase 12,189 25,123 13,811 Gunsan Bio Energy Co., Ltd. Electricity purchase — — 3,022 Korea Electric Vehicle Charging Service Electricity purchase 1,093 605 536 Tamra Offshore Wind Power Co., Ltd. Electricity purchase 2,105 8,371 — Cheongna Energy Co., Ltd. Service 59 58 58,747 YaksuESS Co., Ltd Service — — 1,191 Gangwon Wind Power Co., Ltd. Electricity purchase 25,968 25,407 24,116 Hyundai Green Power Co., Ltd. Electricity purchase 458,378 480,815 507,662 Korea Power Exchange Trading Fees 207,855 137,489 120,509 Hyundai Energy Co., Ltd. Electricity purchase 87,607 3,445 2,847 Taebaek Wind Power Co., Ltd. REC purchase 6,534 8,582 7,070 Taeback Guinemi Wind Power Co., Ltd. Electricity purchase — — 349 Pyeongchang Wind Power Co., Ltd. Service 4,033 6,994 5,188 Daeryun Power Co., Ltd. Electricity purchase 146,189 184,063 144,862 Changjuk Wind Power Co., Ltd. Electricity purchase 6,981 7,929 6,994 GS Donghae Electric Power Co., Ltd. Electricity purchase 351,367 780,233 681,379 KNH Solar Co., Ltd. Electricity purchase 3,947 3,586 3,377 S-Power Electricity purchase 457,329 507,875 522,469 Hadong Mineral Fiber Co., Ltd. Service — 60 — Green Biomass Co., Ltd. Woodchip purchase 1,345 440 — YeongGwang Yaksu Wind Electric. Co., Ltd Electricity purchase — 2,437 6,511 PND solar., Ltd Service — — 557 Hyundai Ecoenergy Co., Ltd. Electricity purchase — — 6,810 Korea Energy Solution Co., Ltd. Electricity purchase — — 15 9 Associates (Overseas) Electricity purchase and 72 31 — <Joint ventures> Daegu Green Power Co., Ltd. Electricity purchase 252,024 287,008 296,464 KAPES, Inc. Service 164,165 77,758 142,511 Honam Wind Power Co., Ltd. Electricity purchase 5,962 7,700 5,306 Korea Power Engineering Service Co., Ltd. Service 1,292 1,765 1,774 Seokmun Energy Co., Ltd. REC purchase 21,674 31,759 26,370 Chun-cheon Energy Co., Ltd. REC purchase 194,136 320,954 313,471 Yeonggwangbaeksu Wind Power Co., Ltd. Electricity purchase 11,124 11,366 11,739 Yeonggwang Wind Power Co., Ltd. Electricity purchase — — 11,940 Busan Shinho Solar Power Co., Ltd. REC purchase 7,984 7,901 7,843 Global Trade Of Power System Co., Ltd. Service 414 565 502 Expressway Solar-light Power Generation Co., Ltd. Electricity purchase 2,941 3,513 3,067 25 Joint ventures (Overseas) Electricity purchase and 2,785 1,404 7,232 <Others> Yeongwol Energy Station Co., Ltd. REC purchase 14,256 4,019 — Ulleungdo Natural Energy Co., Ltd. Service 119 63 — Korea Development Bank Interest expense 4,573 5,043 4,063 Dividend paid 418,407 166,876 20
Receivables and payables arising from related party transactions	Receivables and payables arising from related party transactions as of December 31, 2018 and 2019 are as follows: Receivables Payables Company name Type 2018 2019 2018 2019 In millions of won <Associates> Dongducheon Dream Power Co., Ltd. Trade receivables ￦ 332 323 — — Non-trade receivables and others 298 267 — — Trade payables — — 74,651 85,920 Non-trade payables and others — — 10 12 Korea Gas Corporation Trade receivables 9,439 9,267 — — Non-trade receivables and others 498 38 — — Trade payables — — 601,092 462,138 Non-trade payables and others — — 314 560 Daegu Photovoltaic Co., Ltd. Trade payables — — 83 69 Korea Power Engineering Service Co., Ltd. Trade receivables — 74 — — Korea Electric Power Industrial Development Co., Ltd. Trade receivables 278 243 — — Non-trade receivables and others 51 43 — — Trade payables — — — 3,756 Non-trade payables and others — — 13,102 3,827 Goseong Green Energy Co., Ltd. Trade receivables — 103 — — Non-trade receivables and others — 5,285 — — Non-trade payables and others — — 43,020 65,626 Gangneung Eco Power Co., Ltd. Trade receivables 1 115 — — Non-trade receivables and others 99 65 — — Shin Pyeongtaek Power Co., Ltd. Trade receivables 123 1,013 — — Non-trade receivables and others 242 2,281 — — Trade payables — — — 64,696 Non-trade payables and others — — 82 61 Naepo Green Energy Co., Ltd. Trade receivables 17 18 — — Noeul Green Energy Co., Ltd. Trade receivables 3 3 — — Non-trade payables and others — — 8,774 1,855 Samcheok Eco Materials Co., Ltd. Trade receivables 61 59 — — YTN Co., Ltd. Trade receivables 98 97 — — Non-trade payables and others — — 11 — Busan Green Energy Co., Ltd. Trade receivables 1 1 — — Non-trade payables and others — — 10,882 606 Gunsan Bio Energy Co., Ltd. Non-trade receivables and others 3,458 — — — Korea Electric Vehicle Charging Service Trade receivables 69 137 — — Non-trade receivables and others 354 529 — — Non-trade payables and others — — 56 — Daegu Clean Energy Co., Ltd. Non-trade receivables and others 17 — — — Cheongna Energy Co., Ltd. Trade receivables 183 1,074 — — Yaksu ESS Co., Ltd. Trade payables — — — 525 Gangwon Wind Power Co., Ltd. Trade receivables 10 7 — — Trade payables — — 2,547 2,979 Gwangyang Green Energy Co., Ltd. Non-trade receivables and others — 1,334 — — Hyundai Green Power Co., Ltd. Trade receivables 390 502 — — Trade payables — — 38,072 41,587 Korea Power Exchange Trade receivables 847 1,142 — — Non-trade receivables and others 229 114 — — Non-trade payables and others — — 1,214 4,160 Hyundai Energy Co., Ltd. Trade receivables 57 128 — — Non-trade receivables and others 9,664 12,532 — — Trade payables — — 259 175 Non-trade payables and others — — 8,021 9,178 Receivables Payables Company name Type 2018 2019 2018 2019 In millions of won <Associates> Ecollite Co., Ltd. Non-trade receivables and others ￦ 210 210 — — Taebaek Wind Power Co., Ltd. Trade payables — — 453 358 Non-trade — — 291 243 Taebaek Guinemi Wind Power Co., Ltd. Non-trade — 2 — — Trade payables — — — 190 Pyeongchang Wind Power Co., Ltd. Trade receivables 4 4 — — Non-trade — — 25 — Daeryun Power Co., Ltd. Trade receivables 178 144 — — Trade payables — — 15,845 19,843 Changjuk Wind Power Co., Ltd. Trade payables — — 455 447 Non-trade — — 273 280 GS Donghae Electric power Co., Ltd. Trade receivables 245 175 — — Non-trade receivables and others 2,537 367 — — Trade payables — — 69,820 69,811 Non-trade — — 59 16 KNH Solar Co., Ltd. Trade receivables 1 1 — — S-Power Trade receivables 922 89 — — Non-trade 34 43 — — Trade payables — — 56,897 53,705 Non-trade — — 16 — PND solar., Ltd. Trade receivables 3 — — — Hyundai Ecoenergy Co., Ltd. Trade receivables — 16 — — YeongGwang Yaksu Wind Electric. Co., Ltd. Trade receivables — 5 — — Trade payables — — 2,679 — Cheong-Song Noraesan Wind Power Co., Ltd. Trade receivables — 1 — — Suwon New Power Co., Ltd. Non-trade — 2,939 — — 4 Associates (Overseas) Non-trade 455 1,112 — — <Joint ventures> Daegu Green Power Co., Ltd. Trade receivables 110 113 — — Non-trade 12 1 — — Trade payables — — 32,609 28,980 KAPES, Inc. Trade receivables — 1 — — Non-trade 253 — — — Non-trade — — 338 50,738 Dangjin Eco Power Co., Ltd. Trade receivables — 2 — — Non-trade 18 — — — Honam Wind Power Co., Ltd. Trade payables — — 432 347 Non-trade — — 3,573 1,671 Jeongam Wind Power Co., Ltd. Trade receivables 151 165 — — Non-trade — — 2 6 Korea Power Engineering Service Co., Ltd. Non-trade — 74 — — Seokmun Energy Co., Ltd. Trade receivables ￦ 39 51 — — Non-trade 303 136 — — Non-trade — — 5,043 4,750 Incheon New Power Co., Ltd. Trade receivables 128 — — — Chun-cheon Energy Co., Ltd. Trade receivables 20 260 — — Non-trade 308 5,362 — — Trade payables — — 33,796 23,438 <Joint ventures> Yeonggwangbaeksu Wind Power Co., Ltd. Trade receivables 7 6 — — Non-trade — 157 — — Trade payables — — 736 671 Non-trade — — 789 1,526 Yeonggwang Wind Power Co., Ltd. Trade receivables 10 10 — — Non-trade — 54 — — Non-trade — — — 2,432 KW Nuclear Components Co., Ltd. Trade receivables 4 4 — — Non-trade receivables and others 31 15 — — KEPCO-Uhde Inc. Non-trade — — 4 9 Busan Shinho Solar Power Co., Ltd. Trade receivables 2 2 — — Trade payables — — 175 148 Non-trade — — 717 733 Daesan Green Energy Co., Ltd. Trade receivables — 6 — — Cheong-Song Noraesan Wind Power Co., Ltd. Trade receivables — 1 — — Saemangeum Solar Power Co., Ltd. Non-trade — 2,197 — — 14 Joint ventures (Overseas) Trade receivables 30,208 51,700 — — Non-trade 740 13,652 — — Non-trade — — 18,379 87,404 <Others> Korea Development Bank Accrued interest income 1,147 1,630 — — Non-trade 12,125 146,416 — — Non-trade — — 218 152 Derivatives 27,306 41,368 18,095 6,531
Loans and others arising from related party transactions	Type Company name Beginning Loans Collection Others Ending balance In millions of won Associates KNOC Nigerian East Oil Co., Ltd., KNOC Nigerian West Oil Co., Ltd. ￦ 27,634 132 — 910 28,676 (Allowance for doubtful accounts) (6,065 ) — — (1,260 ) (7,325 ) Associates PT. Cirebon Electric Power 8,696 — (8,900 ) 782 578 Associates Xe-Pian Xe-Namnoy 1,413 20,148 — (606 ) 20,955 Associates PT. Wampu Electric Power 14,880 — — 1,622 16,502 Associates Gunsan Bio Energy Co., Ltd. 9,396 3,000 — — 12,396 (Allowance for doubtful accounts) — (10,128 ) — — (10,128 ) Associates Hyundai Energy Co., Ltd. ￦ 2,465 — — — 2,465 (Allowance for doubtful accounts) (2,465 ) — — — (2,465 ) Joint ventures Recursos Solares PV de Mexico II SA DE CV — 1,054 — 1 1,055 Joint ventures Horus Solar SA DE CV — 3,320 — 3 3,323 Joint ventures SUNMEX RENOVABLES SA DE CV — 144 — — 144 Joint ventures Kelar S.A 48,694 — (8,320 ) 1,784 42,158 Joint ventures Chester Solar IV SpA — 1,688 (1,688 ) — — Joint ventures Chester Solar V SpA — 535 (535 ) — — Joint ventures Diego de Almagro Solar SpA — 2,101 (2,101 ) — — Joint ventures Chun-cheon Energy Co., Ltd. 616 4,441 — — 5,057 Joint ventures Dangjin Eco Power Co., Ltd. (before the spin-off) — 2,600 (2,600 ) — — Joint ventures DE energia SpA — 6,799 — (167 ) 6,632 Joint ventures Eumseong Natural Gas Power Co., Ltd.(*1) — 20,000 (20,000 ) — — ￦ 105,264 55,834 (44,144 ) 3,069 120,023 (*1) Eumseong Natural Gas Power Co., Ltd. was established by spin-off
Borrowings arising from related party transactions	Borrowings arising from related party transactions as of December 31, 2018 and 2019 are as follows: Related parties Type Beginning balance Borrowings Repayment Others Ending balance In millions of won Korea Development Bank Facility ￦ 66,793 5,700 (12,648 ) — 59,845 Others 4,154 — (654 ) — 3,500 Operating funds 81,000 172,442 (73,992 ) (450 ) 179,000 Syndicated Loan 17,277 — (1,055 ) 863 17,085
Guarantees provided to associates or joint ventures	Guarantees provided to associates or joint ventures as of December 31, 2019 are as follows: Primary guarantor Principal obligor Type of guarantees Credit limit Guarantee In millions of Korea Electric Power Corporation Shuweihat Asia Operation & Maintenance Company Performance guarantees USD 11,000 Shuweihat Asia Power Investment B.V. Korea Electric Power Corporation Rabigh Operation & Maintenance Company Limited Performance guarantees and others USD 1,387 Rabigh Electricity Company Korea Electric Power Corporation Nghi Son 2 Power LLC Performance guarantees USD 70,000 SMBC Ho Chi Minh and others Korea Electric Power Corporation Barakah One Company Debt guarantees USD 900,000 Export-Import Bank of Korea and others Performance guarantees and others USD 4,430,240 Korea Electric Power Corporation RE Holiday Holdings LLC Performance guarantees USD 223,000 EPS Renewables Holdings, LLC, Santander Bank and others Korea Electric Power Corporation RE Pioneer Holdings LLC Performance guarantees USD 170,000 EPS Renewables Holdings, LLC, Santander Bank and others Korea Electric Power Corporation RE Barren Ridge 1 Holdings LLC Performance guarantees USD 149,000 EPS Renewables Holdings, LLC, Santander Bank and others Korea Electric Power Corporation Rabigh Electricity Company Performance guarantees SAR 6,508 Hana Bank Korea Electric Power Corporation Debt guarantees SAR 80,000 Korea Electric Power Corporation Shuweihat Asia Power Investment B.V. Performance guarantees USD 100,000 ING Bank Korea Electric Power Corporation Amman Asia Electric Power Company Korea Western Power Co., Ltd. Cheongna Energy Co., Ltd. Collateralized money invested KRW 1,411 Hana Bank and others Guarantees for supplemental funding and others(*1) — Korea Western Power Co., Ltd. Xe-Pian Xe-Namnoy Payment guarantees for business reserve USD 2,500 Krung Thai Bank Collateralized money invested KRW 72,935 Impounding bonus guarantees USD 5,000 SK E&C Korea Western Power Co., Ltd. Rabigh Operation & Maintenance Company Limited Performance guarantees and others SAR 5,600 Saudi Arabia British Bank Korea Western Power Co., Ltd. Daegu Photovoltaic Co., Ltd. Collateralized money invested KRW 2,060 Korea Development Bank Korea Western Power Co., Ltd. Dongducheon Dream Power Co., Ltd. Collateralized money invested(*7) KRW 41,531 Kookmin Bank and others Debt guarantees KRW 20,300 BNK Securities and others Korea Western Power Co., Ltd. PT. Mutiara Jawa Collateralized money invested KRW 1,438 Woori Bank Nonghyup Bank Korea Western Power Co., Ltd. Haeng Bok Do Si Photovoltaic Power Co., Ltd. Collateralized money invested KRW 215 Korea Western Power Co., Ltd. Shin Pyeongtaek Power Co., Ltd. Collateralized money invested KRW 66,956 Kookmin Bank Guarantees for supplemental funding(*1) — Kookmin Bank and others Korea East-West Power Co., Ltd. Busan Shinho Solar Power Co., Ltd. Collateralized money invested KRW 5,045 Korea Development Bank and others Korea East-West Power Co., Ltd. Seokmun Energy Co., Ltd. Collateralized money invested KRW 17,342 Kookmin Bank and others Guarantees for supplemental funding(*1) — Korea East-West Power Co., Ltd. Chun-cheon Energy Co., Ltd. Collateralized money invested KRW 34,872 Kookmin Bank and others Guarantees for supplemental funding(*1) KRW 20,000 Korea East-West Power Co., Ltd. Honam Wind Power Co., Ltd. Collateralized money invested KRW 4,375 Shinhan Bank and others Guarantees for supplemental funding(*1) — Korea East-West Power Co., Ltd. GS Donghae Electric Power Co., Ltd. Collateralized money invested KRW 255,983 Korea Development Bank and others Guarantees for supplemental funding(*1) — Korea East-West Power Co., Ltd. Yeonggwangbaeksu Wind Power Co., Ltd. Collateralized money invested KRW 3,040 Kookmin Bank and others Korea East-West Power Co., Ltd. Yeonggwang Wind Power Co., Ltd. Collateralized money invested KRW 17,627 KDB Capital Corporation and others Guarantees for supplemental funding(*1) — Korea East-West Power Co., Ltd. Daesan Green Energy Co., Ltd. Collateralized money invested KRW 17,182 IBK Guarantees for supplemental funding(*1) KRW 18,989 IBK Korea East-West Power Co., Ltd. Taebaek Gadeoksan Wind Power Co., Ltd. Collateralized money invested KRW 7,846 Samsung Fire & Marine Insurance Co., Ltd. and others Korea East-West Power Co., Ltd. PT. Tanjung Power Indonesia Debt guarantees USD 24,544 Sumitomo Mitsui Banking Corporation Other guarantees USD 3,150 PT Adaro Indonesia Guarantees for supplemental funding(*1) — Sumitomo Mitsui Banking Corporation and others Collateralized money invested KRW 34,327 MUFG and others Korea East-West Power Co., Ltd. South Jamaica Power Company Limited Performance guarantees USD 14,400 Societe Generale Collateralized money invested KRW 13,863 JCSD Trustee Services Limited and others EWP Barbados 1 SRL South Jamaica Power Company Limited Guarantees for supplemental funding(*1, 3) — JCSD Trustee Services Limited and others Korea East-West Power Co., Ltd. DE Energia SpA Collateralized money invested KRW 8,665 Mirae Asset Daewoo Co., Ltd. and others Korea East-West Power Co., Ltd. Debt guarantees KRW 6,632 Korea Southern Power Co., Ltd. KNH Solar Co., Ltd. Collateralized money invested KRW 2,382 Shinhan Bank and Kyobo Life Insurance Co., Ltd. Performance guarantees and guarantees for supplemental funding(*1) — Korea Southern Power Co., Ltd. Daeryun Power Co., Ltd. Collateralized money invested KRW 26,247 Korea Development Bank and others Guarantees for supplemental funding and others(*1) KRW 8,000 Korea Southern Power Co., Ltd. Daegu Green Power Co., Ltd. Collateralized money invested KRW 22,824 Shinhan Bank and others Performance guarantees — Korea Southern Power Co., Ltd. Kelar S.A Performance guarantees USD 61,692 Hana Bank, MUFG Korea Southern Power Co., Ltd. Daehan Wind Power PSC Debt guarantees(*9) USD 16,000 Shinhan Bank Performance guarantees USD 3,600 Debt guarantees(*9) USD 240 Performance Debt guarantees(*9) USD 1,898 Hana Bank Korea Southern Power Co., Ltd. Pyeongchang Wind Power Co., Ltd. Collateralized money invested KRW 5,877 Woori Bank and Shinhan Bank and others Performance guarantees — Korea Southern Power Co., Ltd. Taebaek Guinemi Wind Power Co., Ltd. Collateralized money invested KRW 2,553 IBK Guarantees for supplemental funding(*1) — Korea Southern Power Co., Ltd. Jeongam Wind Power Co., Ltd. Guarantees for supplemental funding(*1) and performance guarantees — SK Securities.Co., LTD., KDB Capital Corporation, and others Collateralized money invested KRW 4,437 Korea Southern Power Co., Ltd. Taebaek Wind Power Co., Ltd. Guarantees for supplemental funding(*1) — Shinhan Bank and others Korea Southern Power Co., Ltd. Samcheok Eco Materials Co., Ltd. Payment guarantees(*4,7) — SEM Investment Co., Ltd. Kospo Chile SpA Kelar S.A. Collateralized money invested KRW 70,462 Export-Import Bank of Korea and others Chester Solar I SpA Collateralized money invested KRW 1,157 IBK Chester Solar IV SpA Collateralized money invested KRW 672 Chester Solar V SpA Collateralized money invested KRW 146 Diego de Almagro Solar Spa Collateralized money invested KRW 1,035 Laurel SpA Collateralized money invested KRW 595 Korea Midland Power Co., Ltd. YeongGwang Yaksu Wind Electric. Co., Ltd. Collateralized money invested KRW 386 IBK and others Korea Midland Power Co., Ltd. Hyundai Green Power Co., Ltd. Collateralized money invested KRW 124,253 Korea Development Bank and others Korea Midland Power Co., Ltd. PT. Cirebon Electric Power Debt guarantees USD 11,248 Mizuho Bank Korea Midland Power Co., Ltd. PT. Wampu Electric Power Debt guarantees USD 4,854 SMBC Korea Midland Power Co., Ltd. Green Energy Electricity Generation Co., Ltd. Collateralized money invested KRW 163 IBK Guarantees for supplemental funding and others(*1) — IBK and others Korea Midland Power Co., Ltd. YaksuESS Co., Ltd. Collateralized money invested KRW 516 IBK Korea Midland Power Co., Ltd. Namjeongsusang Solar Power Operatin Co., Ltd. Collateralized money invested KRW 812 IBK Korea Midland Power Co., Ltd. Gwangbaek Solar Power Investment Co., Ltd. Collateralized money invested KRW 2,054 IBK Korea South-East Power Co., Ltd. Hyundai Energy Co., Ltd. Collateralized money invested(*5) — IBK Guarantees for supplemental funding and others(*1,6) KRW 76,800 NH investment & securities Co., Ltd. and others Korea South-East Power Co., Ltd. S-Power Collateralized money invested KRW 115,784 Korea Development Bank and others Korea South-East Power Co., Ltd. RES Technology AD Collateralized money invested KRW 16,248 UniCredit Bulbank and others Korea South-East Power Co., Ltd. ASM-BG Collateralized money invested KRW 19,376 UniCredit Bulbank and others Korea South-East Power Co., Ltd. Expressway Solar-light Power Generation Co., Ltd. Guarantees for supplemental funding(*1,2) KRW 2,500 Woori Bank Korea South-East Power Co., Ltd. Goseong Green Energy Co., Ltd. Collateralized money invested KRW 2,340 Kyobo Life Insurance Co., Ltd. and others Korea South-East Power Co., Ltd. Gangneung Eco Power Co., Ltd. Collateralized money invested KRW 2,430 Kyobo Life Insurance Co., Ltd. and others Korea South-East Power Co., Ltd. PND solar., Ltd. Collateralized money invested KRW 1,144 IBK Korea South-East Power Co., Ltd. Hyundai Eco Energy Co., Ltd. Collateralized money invested KRW 3,781 Samsung Life Insurance and others Korea South-East Power Co., Ltd. Jaeun Resident Wind Power Plant Co., Ltd. Collateralized money invested KRW 2,198 IBK Korea South-East Power Co., Ltd. Cheongsong Myeonbongsan Wind Power Plant Co., Ltd. Collateralized money invested KRW 2,764 Kyobo Life Insurance Co., Ltd. and others Korea Hydro & Nuclear Power Co., Ltd. Noeul Green Energy Co., Ltd. Collateralized money invested KRW 6,611 Hana Bank and others Guarantees for supplemental funding(*1) — Korea Hydro & Nuclear Power Co., Ltd. Busan Green Energy Co., Ltd. Collateralized money invested KRW 10,636 Shinhan Bank and others Korea Hydro & Nuclear Power Co., Ltd. Cheong-Song Noraesan Wind Power Co., Ltd. Collateralized money invested KRW 3,044 Woori Bank and others Guarantees for supplemental funding(*1) — KEPCO Plant Service & Engineering Co., Ltd. Incheon New Power Co., Ltd. Collateralized money invested(*8) — Shinhan Bank Guarantees for supplemental funding(*1) — (*1) The Company guarantees to provide supplemental funding for business with respect to excessive business expenses or insufficient repayment of borrowings. (*2) The Company has granted the right to Hana Financial Investment Co., Ltd., as an agent for the creditors to Expressway Solar-light Power Generation Co., Ltd. (“ESPG”), to the effect that in the event of acceleration of ESPG’s payment obligations under certain borrowings to such creditors, Hana Financial may demand the Company to dispose of shares in ESPG held by the Company and apply the resulting proceeds to repayment of ESPG’s obligations. (*3) This includes a guarantee for the shareholder’s capital payment in connection with the business of 190MW gas complex thermal power plant in Jamaica. EWP Barbados 1 SRL’s capital contribution amount is USD 18,400,000 and there is no residual guarantee amount among total collateral limit. (*4) Controlling and non-controlling pre-emption (*5) The Company recognized an impairment loss on all of the equity securities of Hyundai Energy Co., Ltd. in prior years, and the acquisition cost of the securities provided as collateral is ￦47,067 million. (*6) Pursuant to the guarantee agreement, the Company recognized other provisions of ￦28,717 million as the possibility of economic benefit outflow to fulfill the obligation was deemed probable and the amount could be reasonably estimated. (*7) The common stocks of Dongducheon Dream Power Co., Ltd. held by the Company were pledged as collateral. (*8) The Company recognized an impairment loss on all of the equity securities of Incheon New Power Co., Ltd. during the year ended December 31,2019, and the acquisition cost of the securities provided as collateral is ￦461 million. (*9) The Company provided a payment guarantee to Daehan Wind Power PSC for reimbursement of Equity Bridge Loan(EBL), opening LC for Debt Service Reserve Account(DSRA), guarantee for the swap termination costs and others.
Derivatives transactions with related parties	Derivatives transactions with related parties as of December 31, 2019 are as follows: (i) Currency Swap Counterparty Contract Contract Amount Contract interest rate per annum Contract exchange rate Pay Receive Pay (%) Receive (%) In millions of won and thousands of foreign currencies Korea Development Bank 2019~2024 ￦ 177,600 USD 150,000 1.24 % 2.50 % ￦ 1,184.00 2015~2025 111,190 USD 100,000 2.62 % 3.25 % 1,111.90 2017~2027 111,610 USD 100,000 2.31 % 3.13 % 1,116.10 2018~2028 108,600 HKD 800,000 2.69 % 3.35 % 135.75 2018~2023 170,280 USD 150,000 2.15 % 3.75 % 1,135.20 2019~2027 119,978 CHF 100,000 1.43 % 0.05 % 1,199.78 2017~2020 114,580 USD 100,000 1.75 % 2.38 % 1,145.80 2016~2021 121,000 USD 100,000 2.15 % 2.50 % 1,210.00 2019~2022 112,650 USD 100,000 1.80 % 3.38 % 1,126.50 2018~2023 320,880 USD 300,000 2.03 % 3.75 % 1,069.60 2019~2022 117,340 USD 100,000 1.06 % 2.38 % 1,173.40 2018~2021 212,960 USD 200,000 2.10 % 3.00 % 1,064.80 2017~2022 113,300 USD 100,000 1.94 % 2.63 % 1,133.00 2018~2023 169,335 USD 150,000 2.26 % 3.88 % 1,128.90 (ii) Currency forward Counterparty Contract date Maturity date Contract amounts Contract exchange rate Pay Receive In millions of won and thousands of foreign currencies Korea Development Bank 2017.12.27 2021.07.12 ￦ 104,849 USD 100,000 ￦ 1,048.49 2019.12.11 2020.01.15 11,925 USD 10,000 1,192.50 2019.12.30 2020.01.23 4,630 USD 4,000 1,157.40
Salaries and other compensations to the key members of management of the Company	The Company considers executive directors and executive head officer in charge of planning, operation, control of business activity as the key members of management. Salaries and other compensations to the key members of management of the Company for the years ended December 31, 2017, 2018 and 2019 are as follows: Type 2017 2018 2019 In millions of won Salaries ￦ 1,271 1,106 1,315 Employee benefits 54 24 31 ￦ 1,325 1,130 1,346

Non-Cash Transactions (Tables)

Non-Cash Transactions (Tables)	12 Months Ended
	Dec. 31, 2019
Non-Cash Transactions [Abstract]
Significant non-cash activities	Significant non-cash Transactions 2017 2018 2019 In millions of won Transfer from construction-in-progress ￦ 13,676,233 8,656,252 14,052,094 Recognition of asset retirement cost and related provision for decommissioning costs 2,494,802 310,272 2,425,668 Transfer from provision for disposal of spent nuclear fuel to accrued expenses 342,861 482,699 376,103 Transfer from long-term borrowings and debt securities to current portion of long-term borrowings and debt securities — 7,100,846 7,759,284 Transfer of right-of-use — — 5,364,647
Changes in liabilities incurred from financing activities	Changes in liabilities incurred from financing activities for the years ended December 31, 2018, and 2019 are as follows: 2018 Non-cash Beginning Cash flows Increase Changes in Effect of Increase Ending balance In millions of won Borrowings and debt securities ￦ 54,747,392 5,972,336 — — 314,899 — 61,034,627 Finance lease liabilities 418,260 (134,454 ) — — — — 283,806 ￦ 55,165,652 5,837,882 — — 314,899 — 61,318,433 2019 Non-cash Beginning Cash flows Increase Changes in Effect of Increase Ending balance In millions of won Borrowings and debt securities ￦ 61,034,626 6,342,074 — — 496,940 2,900 67,876,540 Lease liabilities 283,806 (573,437 ) 218,800 4,943,584 197,380 — 5,070,133 ￦ 61,318,432 5,766,877 218,800 4,943,584 694,080 2,900 72,946,673

Commitments for Expenditure (Ta

Commitments for Expenditure (Tables)	12 Months Ended
	Dec. 31, 2019
Commitments for Expenditure [Abstract]
Commitments for acquisition of property, plant and equipment	The commitments for acquisition of property, plant and equipment as of December 31, 2018 and 2019 are as follows: 2018 2019 Contracts Amounts Balance Amounts Balance In millions of won Purchase of cable (PVC, 1C, 2000SQ) 153,000M and others (Shin-Bupyung-Youngseo) ￦ 56,183 37,309 56,408 24,721 Purchase of cable (PVC, 1C, 2500SQ) 103,374M and others (Bukdangjin-Shin-Tangjung) 44,315 31,801 45,390 32,876 Purchase of GIS (362kV, 6300A, 63kA) 23CB – Youngseo S/S 34,500 34,500 36,143 36,143 Purchase of GIS (362kV, 6300A, 63kA) 26CB – Hwasung S/S 29,143 18,194 40,010 15,300 Purchase of GIS (362kV, 6300A, 63kA) 27CB – Kwangyang S/S 37,694 10,491 37,744 9,700 Purchase of Concrete Poles (10M, 350KGF) 121,900 and 6 others 133,387 13,343 — — Purchase of cable (TR CNCE-W/AL, 66,240 38,998 66,240 — Purchase of cable (FR CNCO-W, 57,475 48,598 59,716 37,249 Purchase of switch (Eco) 9,360 units 40,631 34,797 40,631 24,031 Purchase of cable (TR CNCE-W/AL, — — 36,063 6,243 Construction of Shin-Kori units (#3,4) 7,363,514 3,211 7,498,951 — Construction of Shin-Kori units (#5,6) 8,625,387 5,930,099 8,625,387 4,479,956 Construction of Shin-Hanul units (#1,2) 7,982,342 355,704 8,306,149 — Other 27 contracts 269,681 161,243 352,710 122,890 Service of designing Seoul Combined units (#1,2) 29,996 4,744 30,778 2,119 Purchase of main machine for construction of Seoul Combined units (#1,2) 365,164 51,165 331,249 15,918 Construction of Seoul Combined units (#1,2) 285,890 27,125 387,722 31,150 Purchase of smoke eliminating machine for construction of Shin-Boryeong units (#1,2) 172,609 13,986 157,618 — Service of designing Shin-Boryeong units (#1,2) 120,199 1,076 120,668 888 Purchase of main machine for construction of Shin-Boryeong units (#1,2) 866,065 4,981 816,317 4,955 Purchase of furnace for construction of Shin-Seocheon thermal power plant 305,209 74,631 305,209 43,388 Purchase of turbine generator for construction of Shin-Seocheon thermal power plant 104,402 57,968 105,226 10,736 Electricity construction of Shin-Seocheon thermal power plant 217,848 174,122 231,196 87,874 Purchase of main machine for Jeju LNG combined 166,287 11,272 166,287 12,088 Service of designing Taean IGCC plant units 46,001 3,161 46,101 2,332 Service of designing Taean units (#9,10) 112,344 13,338 112,483 12,862 Purchase of furnace for construction of Taean units (#9,10) 556,504 18,502 556,206 17,579 Purchase of turbine generator for construction of Taean units (#9,10) 214,462 10,422 214,208 10,857 Purchase of coal handling machine for construction of Taean (#9,10) and IGCC units (conditional contract for installation) 205,764 282 205,764 282 Purchase of oxygen plant for construction of Taean IGCC units 96,068 1,552 97,345 1,630 Purchase of gas turbine and turbine equipment of Gimpo combined heat & power plant — — 104,600 104,600 Purchase of coal handling machine for construction of Samcheok units (#1,2) 307,925 48,736 282,927 42,785 Purchase of furnace for construction of Samcheok units (#1,2) 1,092,287 12,215 1,066,824 11,771 Purchase of turbine main equipment for Samcheok units (#1,2) 212,188 348 223,550 132 Purchase of main equipment for Namjeju 146,594 134,949 138,486 84,982
Commitments for inventory purchase	Contract periods for ore concentrates, conversion, enrichment and design and fabrication are as follows: Type Periods Contracted quantity Concentrate 2019 ~ 2030 38,990 Ton U3O8 Transformed 2019 ~ 2030 21,969 Ton U Enrichment 2019 ~ 2030 17,060 Ton SWU Molded (Light) 2019 ~ 2020 756 Ton U Molded (Medium)) 2019 ~ 2020 401 Ton U Molded (Initial core) 2019 ~ 2022 415 Ton U

Contingencies and Commitments (

Contingencies and Commitments (Tables)	12 Months Ended
	Dec. 31, 2019
Contingencies and Commitments [Abstract]
Ongoing litigations related with contingent liabilities and contingent assets	Ongoing litigations and claims related with contingent liabilities and contingent assets as of December 31, 2018 and 2019 are as follows: 2018 2019 Number Claim Number Claim In millions of won As the defendant 570 ￦ 673,882 586 ￦ 697,835 As the plaintiff 174 793,491 199 707,287
Credit lines provided by financial institutions	Credit lines provided by financial institutions as of December 31, 2019 are as follows: Commitments Financial institutions Currency Limited amount Used amount In millions of won and thousands of foreign Commitments on Bank-overdraft Nonghyup Bank and others KRW 1,825,500 373,219 Commitments on Bank-daylight overdraft Nonghyup Bank and others KRW 280,000 — Limit amount available for CP Hana Bank and others KRW 1,250,000 1,150,000 Limit amount available for card Hana Bank and others KRW 51,904 6,686 Banco de Oro PHP 5,000 3,000 Loan limit Kookmin Bank and others KRW 1,050,503 685,429 DBS Bank and others USD 2,492,700 14,400 Certification of payment on payables from foreign country Nonghyup Bank USD 4,680 3,892 Certification of payment on L/C Shinhan Bank KRW 7,749 — Shinhan Bank and others USD 1,051,334 171,975 Societe Generale MYR 2,500 2,500 Certification of Performance guarantee on contract Seoul Guarantee Insurance and others KRW 84,011 66,892 First Abu Dhabi Bank and others USD 596,862 465,093 Korea Development Bank and others JPY 637,495 637,495 Hana Bank and others EUR 4,158 4,158 Hana Bank and others INR 191,883 191,883 Hana Bank CAD 464 464 Shinhan Bank ZAR 55,730 55,730 Certification of bidding Hana Bank USD 10,000 197 Advance payment bond, Warranty bond, Retention bond and others Seoul Guarantee Insurance KRW 44,047 44,047 Export-Import Bank of Korea and others USD 714,654 649,402 Hana Bank SAR 86,508 86,508 SMBC Bank QAR 15,000 15,000 Others Nonghyup Bank and others KRW 537,064 47,638 Export-Import Bank of Korea and others USD 1,562,194 1,315,378 Shinhan Bank JPY 381,210 381,210 Standard Chartered AED 50 50 Inclusive credit Hana Bank KRW 8,000 772 Hana Bank and others USD 30,975 17,502 Shinhan Bank INR 92,348 92,348 Trade finance BNP Paribas and others USD 700,000 —
Blank check and assets provided as collaterals or pledges to financial institutions by the Company	As of December 31, 2019, blank check and assets provided as collaterals or pledges to financial institutions by the Company are follows: Guarantor Guarantee Type of guarantee Currency Amount Description In millions of won and thousands of foreign currencies Mira Power Limited International Finance Corporation and others Property, plant and equipment and others USD 275,600 Collateral for borrowings(*1) Tamra Offshore Wind Power Co., Ltd. Kyobo Life Insurance Co., Ltd. and others Property, plant and equipment and others KRW 171,600 Collateral for borrowings(*2) SE Green Energy Co., Ltd. DB Insurance Co., Ltd. and others Property, plant and equipment and others KRW 149,500 Collateral for borrowings(*2) Gyeonggi Green Energy Co., Ltd. Korea Development Bank and others Cash and cash equivalents KRW 327,080 Collateral for borrowings(*2) Commerce and Industry Energy Co., Ltd. IBK and others Land, buildings, structures and machinery and others KRW 110,500 Collateral for borrowings(*2) KOSPO Youngnam Power Co., Ltd. Shinhan Bank and others Cash and cash equivalents KRW 396,120 Collateral for borrowings(*2) Gyeongju Wind Power Co., Ltd. Samsung Fire & Marine Insurance Co., Ltd. and Others Property, plant and equipment and others KRW 110,240 Collateral for borrowings (*2) Korea Offshore Wind Power Co., Ltd. Woori Bank and Others Utility plant and others KRW 293,400 Collateral for borrowings(*2) Qatrana Electric Power Company The Islamic Development Bank and others Finance lease receivable and property, plant and equipment and others JOD 236,570 Collateral for borrowings(*1) KST Electric Power Company The Export—Import Bank of Korea and others Finance lease receivable and property, plant and equipment and others USD 401,277 Collateral for debt securities(*1) (*1) This is based on the amount of loan commitment limit. (*2) As of December 31, 2019, the Company has established guarantees for pledge for transfer of rights of long-term borrowings, pledge for insurance claims, pledge for shares, etc. The Company has ￦1,197 million of project loans from Korea Energy Agency as of December 31, 2019. The Company has provided a blank check as a repayment guarantee. (5) The Company temporarily suspended operations of the Gangneung hydroelectric generating plant, with a carrying amount of ￦75,634 million as of December 31, 2019, to improve the quality of water used in generating electricity. The expenses related to the suspension of operations of ￦49 million and depreciation on the idle assets of ￦6,542 million are recorded in other expenses for the year ended December 31, 2019. Regarding the improvement of water quality, the results of damages compensation for the local residents cannot be reasonably estimated, and the Company is in negotiations with Gangneung City and related stakeholders to restart the Gangneung hydroelectric generating plant as of December 31, 2019. (6) Due to the Korean government’s announcement of suspension of operation in the Gaeseong Industrial District, it is uncertain if the Company can exercise the property rights for the Company’s facility in the Gaeseong Industrial District as of December 31, 2019. The book value of facility is ￦16,611 million and the amount of trade receivables related to the companies residing in Gaeseong industrial complex is ￦2,911 million. The outcome of this event cannot be reasonably estimated as of December 31, 2019. (7) In connection with the electric power IT modernization project in Kerala, India, negotiations are underway due to disagreements in the contract regarding the existence and the scope of a warranty obligation. However, the Company has not recognized any provision because the amount and timing of economic benefit outflow cannot be reasonably estimated as of December 31, 2019.

Business Combination (Tables)

Business Combination (Tables)	12 Months Ended
	Dec. 31, 2019
Disclosure of detailed information about business combination [Abstract]
Disclosure of business combinations	The details of business combinations that occurred for the year ended December 31, 2019 are as follows: Company Key operation Date of Transfer In millions of won Eumseong Natural Gas Power Co., Ltd. Power generation 2019.12.23 225,758 Eumseong Natural Gas Power Co., Ltd. was established in August 2019 by spin-off
Details of the transfer price at fair value given by the acquirer of the business combination	Type Amounts In millions of won Cash and cash equivalents ￦ 156,700 Other trade payables 10,000 Fair value of the shares owned before the acquisition 59,058 ￦ 225,758
The fair values of assets and liabilities acquired through the business combination at the acquisition date	The fair values of assets and liabilities acquired through the business combination at the acquisition date for the year ended December 31, 2019 are as follows: Type Amounts In millions of won Fair value of the identifiable assets ￦ Current assets Cash and cash equivalents 2,389 Trade and other receivables 55 Non-current Property, plant and equipment 54 Intangible assets 172,434 Other assets 60 Fair value of the identifiable liabilities Current liabilities Borrowings (2,900 ) Non-current Deferred tax liabilities (41,729 ) ￦ 130,363
Details of goodwill resulting from the business combination	Details of goodwill resulting from the business combination for the year ended December 31, 2019 are as follows: Type Amounts In millions of won Fair value of transfer price ￦ 225,758 Less : Fair value of the identifiable net assets (130,363 ) ￦ 95,395
Net cash outflows from the business combination	Net cash outflows from the business combination for the year ended December 31, 2019 are as follows: Type Amounts In millions of won Cash paid for the acquisition ￦ 156,700 Less : Cash and cash equivalents received (2,389 ) ￦ 154,311

Subsequent Events (Tables)

Subsequent Events (Tables)	12 Months Ended
	Dec. 31, 2019
Subsequent Events [Abstract]
Subsequent Events	Subsequent to December 31, 2019, Korea South-East Power Co., Ltd., Korea Midland Power Co., Ltd. and Korea Hydro & Nuclear Power Co., Ltd. issued a foreign bond and corporate bonds for funding debt repayment, facility investments, and operations as follows: Company Type Issue date Maturity Interest rate Amount In millions of won and thousands of foreign currencies Korea South-East Power Co., Ltd. Foreign bond 2020.02.03 2025.02.03 2.13 % USD 300,000 Korea Midland Power Co., Ltd. #54-1 non-guaranteed 2020.02.25 2040.02.25 1.53 % KRW 50,000 #54-2 non-guaranteed 2020.02.25 2050.02.25 1.53 % KRW 120,000 #55 non-guaranteed 2020.03.18 2040.03.18 1.59 % KRW 80,000 Korea Hydro & Nuclear Power Co., Ltd. #55-1 non-guaranteed 2020.04.02 2040.04.02 1.80 % KRW 50,000 #55-2 non-guaranteed 2020.04.02 2050.04.02 1.80 % KRW 50,000 Subsequent to December 31, 2019, Korea Western Power Co., Ltd. borrowed foreign short-term borrowings for funding operations. Details of the foreign short-term borrowings are as follows: Company Type Issue date Maturity Interest rate Amount Thousands of foreign currencies Korea Western Power Co., Ltd. Foreign short-term borrowings 2020.02.06 2020.05.06 1.97 % USD 24,658 Foreign short-term borrowings 2020.02.26 2020.05.26 1.86 % USD 7,329

General Information (Details)

General Information (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Reporting Entity (Description of the controlling company) [Abstract]
Name of reporting entity or other means of identification	Korea Electric Power Corporation and subsidiaries
Name of parent entity	Korea Electric Power Corporation
Entity Incorporation, Date of Incorporation	Incorporated on January 1, 1982 in accordance with the Korea Electric Power Corporation Act (the "KEPCO Act")
Description of nature of entity's operations and principal activities	Engage in the generation, transmission and distribution of electricity and development of electric power resources. KEPCO also provides power plant construction services.
Country of incorporation	Republic of Korea.
Information of listing on stock market	KEPCO's stock was listed on the Korea Stock Exchange on August 10, 1989 and KEPCO listed its Depository Receipts (DR) on the New York Stock Exchange on October 27, 1994.
Address of registered office of entity	KEPCO's head office is located in Naju, Jeollanam-do.
Issued capital	₩ 3,209,820	₩ 3,209,820

Shareholders Information (Detai

Shareholders Information (Details) - shares	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of shareholders information [Line Items]
Number of shares	641,964,077	641,964,077	641,964,077
Percentage of ownership	100.00%
Government of the Republic of Korea
Disclosure of shareholders information [Line Items]
Number of shares	116,841,794
Percentage of ownership	18.20%
Korea Development Bank
Disclosure of shareholders information [Line Items]
Number of shares	211,235,264
Percentage of ownership	32.90%
Foreign investors
Disclosure of shareholders information [Line Items]
Number of shares	154,843,683
Percentage of ownership	24.12%
Other Shareholders
Disclosure of shareholders information [Line Items]
Number of shares	159,043,336
Percentage of ownership	24.78%

Explanation of initial applicat

Explanation of initial application of IFRS 16 (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of Explanation of initial application of IFRS 16 [Line Items]
Current non-financial assets (Note 15)		₩ 1,206,377	₩ 875,867	₩ 878,888
Total current assets		19,483,001	19,742,047	19,745,068
Non-current trade and other receivables, net (Notes 5,8,20,45,46 and 47)		2,002,297	1,819,835	1,819,845
Property, plant and equipment, net (Notes 18,24,27 and 49)		164,701,827	157,691,141	152,743,194
Non-current non-financial assets (Note 15)		166,929	325,820	327,152
Total non-current assets		178,114,791	170,450,598	165,503,993
Total Assets (Note 4)		197,597,792	190,192,645	185,249,061	₩ 181,788,915
Trade and other payables, net (Notes 5,22,24,45 and 47)		6,649,402	6,915,699	6,405,395
Total current liabilities		24,231,656	22,351,837	21,841,533
Non-current trade and other payables, net (Notes 5,22,24,45 and 47)		6,965,760	7,374,976	2,941,696
Total non-current liabilities		104,476,487	96,748,046	92,314,766
Total liabilities (Note 4)		128,708,143	119,099,883	114,156,299	₩ 108,824,274
Total liabilities and equity		₩ 197,597,792	190,192,645	₩ 185,249,061
Increase (decrease) due to changes in accounting policy required by IFRSs
Disclosure of Explanation of initial application of IFRS 16 [Line Items]
Current non-financial assets (Note 15)			(3,021)
Total current assets			(3,021)
Non-current trade and other receivables, net (Notes 5,8,20,45,46 and 47)			(10)
Property, plant and equipment, net (Notes 18,24,27 and 49)			4,947,947
Non-current non-financial assets (Note 15)			(1,332)
Total non-current assets			4,946,605
Total Assets (Note 4)			4,943,584
Trade and other payables, net (Notes 5,22,24,45 and 47)			510,304
Total current liabilities			510,304
Non-current trade and other payables, net (Notes 5,22,24,45 and 47)			4,433,280
Total non-current liabilities			4,433,280
Total liabilities (Note 4)	[1]		4,943,584
Total liabilities and equity			₩ 4,943,584
[1]	The adjustment from the total liabilities amounting to KRW 4,943,584 is a present value of operating lease payment as of December 31, 2018, discounted by the weighted average interest rate of the lessee's incremental borrowing rates as of January 1, 2019, and deducted by the present value of short-term leases and low-value asset leases payments

Significant Basis Of Preparatio

Significant Basis Of Preparation And Accounting Policies_Estimated economic useful lives for premises and equipment except for land (Details)	12 Months Ended
	Dec. 31, 2019
Buildings
Disclosure of useful life of property plant and equipment [Line Items]
Useful lives (years)	8 ~ 40
Structures
Disclosure of useful life of property plant and equipment [Line Items]
Useful lives (years)	8 ~ 50
Machinery
Disclosure of useful life of property plant and equipment [Line Items]
Useful lives (years)	2 ~ 32
Vehicles
Disclosure of useful life of property plant and equipment [Line Items]
Useful lives (years)	3 ~ 8
Loaded heavy water
Disclosure of useful life of property plant and equipment [Line Items]
Useful lives (years)	30
Asset retirement costs
Disclosure of useful life of property plant and equipment [Line Items]
Useful lives (years)	18, 30, 40, 60
Right-of-use assets
Disclosure of useful life of property plant and equipment [Line Items]
Useful lives (years)	1 ~ 32
Ships
Disclosure of useful life of property plant and equipment [Line Items]
Useful lives (years)	9
Others
Disclosure of useful life of property plant and equipment [Line Items]
Useful lives (years)	4 ~ 15

Significant Basis Of Preparat_2

Significant Basis Of Preparation And Accounting Policies_Estimated useful life for intangible assets (Details)	12 Months Ended
	Dec. 31, 2019
Usage rights for donated assets
Disclosure of intangible assets with indefinite useful life [Line Items]
Useful lives (years)	10 ~ 30
Amortization methods	Straight line
Software
Disclosure of intangible assets with indefinite useful life [Line Items]
Useful lives (years)	4, 5
Amortization methods	Straight line
Industrial rights
Disclosure of intangible assets with indefinite useful life [Line Items]
Useful lives (years)	5 ~ 10
Amortization methods	Straight line
Development expenses
Disclosure of intangible assets with indefinite useful life [Line Items]
Useful lives (years)	5
Amortization methods	Straight line
Leasehold rights
Disclosure of intangible assets with indefinite useful life [Line Items]
Useful lives (years)	10
Amortization methods	Straight line
Other intangible assets
Disclosure of intangible assets with indefinite useful life [Line Items]
Useful lives (years)	3 ~ 50 or Indefinite
Amortization methods	Straight line
Mining rights
Disclosure of intangible assets with indefinite useful life [Line Items]
Useful lives (years)	-
Amortization methods	Unit of production

Operating segments (Details)

Operating segments (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Disclosure of operating segments [Line Items]
Total segment revenue	₩ 58,568,082	₩ 60,033,062	₩ 59,335,889
Intersegment revenue	0	0	0
Revenue from external customers	58,568,082	60,033,062	59,335,889
Depreciation and amortisation	11,128,740	10,024,794	9,773,711
Interest income	268,118	223,767	206,143
Interest expense	2,046,811	1,868,458	1,789,552
Employee benefit expense	725,120	360,575	391,360
Loss on abandonment of property, plant and equipment	364,233	481,176	424,091
Increase in provisions, net	2,301,215	1,056,994	1,690,120
Operating profit (loss)	(1,707,527)	(685,109)	5,319,869
Finance income	1,009,706	796,870	1,530,618
Finance expense	(2,782,156)	(2,470,743)	(3,127,952)
Profit (loss) related to associates and joint ventures	214,139	358,163	(108,317)
Profit (loss) before income tax	(3,265,838)	(2,000,819)	3,614,218
Segment assets	197,597,792	185,249,061	181,788,915	₩ 190,192,645
Investments in associates and joint ventures	5,914,831	5,878,345	5,330,696
Acquisition of non-current assets	14,229,785	12,377,457	12,679,845
Segment liabilities	128,708,143	114,156,299	108,824,274	₩ 119,099,883
Operating segments
Disclosure of operating segments [Line Items]
Total segment revenue	95,197,218	97,262,180	94,974,836
Intersegment revenue	36,629,136	37,229,118	35,638,947
Revenue from external customers	58,568,082	60,033,062	59,335,889
Depreciation and amortisation	11,250,366	10,081,743	9,833,297
Interest income	301,857	268,043	230,685
Interest expense	2,081,559	1,912,094	1,818,399
Employee benefit expense	737,207	391,055	421,827
Loss on abandonment of property, plant and equipment	364,233	481,176	424,091
Increase in provisions, net	2,553,019	1,049,005	2,076,867
Operating profit (loss)	(1,411,975)	(557,368)	5,152,814
Profit (loss) related to associates and joint ventures	214,138	358,163	(108,317)
Segment assets	235,492,772	223,823,428	220,561,693
Investments in associates and joint ventures	5,914,831	5,878,345	5,330,696
Acquisition of non-current assets	14,311,340	12,440,174	12,656,229
Segment liabilities	130,033,377	115,812,546	110,538,279
Operating segments | Transmission and distribution
Disclosure of operating segments [Line Items]
Total segment revenue	58,328,372	59,676,952	59,486,766
Intersegment revenue	1,336,725	1,393,120	2,044,160
Revenue from external customers	56,991,647	58,283,832	57,442,606
Depreciation and amortisation	3,814,428	3,555,158	3,466,410
Interest income	73,478	77,925	49,987
Interest expense	777,120	708,329	737,971
Employee benefit expense	298,144	144,180	158,738
Loss on abandonment of property, plant and equipment	350,865	424,774	384,595
Increase in provisions, net	987,828	580,931	885,195
Operating profit (loss)	(2,568,529)	(1,814,363)	1,902,634
Profit (loss) related to associates and joint ventures	140,757	287,268	(105,166)
Segment assets	109,809,254	107,486,379	106,540,154
Investments in associates and joint ventures	3,716,931	3,671,897	3,366,309
Acquisition of non-current assets	6,340,593	6,323,504	6,606,512
Segment liabilities	58,350,681	53,404,610	50,757,798
Operating segments | Electric power generation (Nuclear)
Disclosure of operating segments [Line Items]
Total segment revenue	8,937,026	8,858,717	9,415,752
Intersegment revenue	8,908,803	8,833,787	9,359,468
Revenue from external customers	28,223	24,930	56,284
Depreciation and amortisation	3,227,695	3,088,019	3,267,510
Interest income	37,277	30,422	21,034
Interest expense	511,864	503,161	487,503
Employee benefit expense	132,283	76,467	80,809
Loss on abandonment of property, plant and equipment	0	38,886	0
Increase in provisions, net	672,134	520,167	801,800
Operating profit (loss)	782,511	357,401	1,347,794
Profit (loss) related to associates and joint ventures	(5,497)	9,946	3,637
Segment assets	59,562,190	55,792,704	55,011,096
Investments in associates and joint ventures	59,081	43,038	11,843
Acquisition of non-current assets	2,574,358	2,187,077	2,083,967
Segment liabilities	33,909,152	30,484,104	29,252,816
Operating segments | Electric power generation (Non-nuclear)
Disclosure of operating segments [Line Items]
Total segment revenue	24,254,957	25,204,085	22,795,816
Intersegment revenue	23,472,153	24,389,816	21,885,251
Revenue from external customers	782,804	814,269	910,565
Depreciation and amortisation	3,955,333	3,269,023	2,954,375
Interest income	35,626	29,313	18,860
Interest expense	655,466	577,441	486,176
Employee benefit expense	163,626	91,140	94,075
Loss on abandonment of property, plant and equipment	13,364	17,516	39,335
Increase in provisions, net	766,407	(227,234)	171,457
Operating profit (loss)	551,287	482,418	1,523,497
Profit (loss) related to associates and joint ventures	77,641	58,993	(6,718)
Segment assets	54,758,933	49,296,392	47,938,084
Investments in associates and joint ventures	2,088,581	2,114,203	1,904,224
Acquisition of non-current assets	4,955,784	3,435,222	3,250,524
Segment liabilities	33,117,193	27,558,156	26,337,295
Operating segments | Plant maintenance & engineering service
Disclosure of operating segments [Line Items]
Total segment revenue	2,627,539	2,526,126	2,621,440
Intersegment revenue	2,254,841	2,170,959	2,211,716
Revenue from external customers	372,698	355,167	409,724
Depreciation and amortisation	125,546	114,030	109,001
Interest income	14,214	12,505	10,801
Interest expense	2,861	4,126	2,967
Employee benefit expense	124,745	77,526	87,344
Loss on abandonment of property, plant and equipment	0	0	161
Increase in provisions, net	124,242	174,785	219,382
Operating profit (loss)	312,341	314,755	265,593
Profit (loss) related to associates and joint ventures	1,237	1,956	(70)
Segment assets	3,528,879	3,431,068	3,273,959
Investments in associates and joint ventures	50,238	49,207	48,320
Acquisition of non-current assets	95,810	111,393	145,779
Segment liabilities	1,124,855	1,200,390	1,176,627
Operating segments | Others
Disclosure of operating segments [Line Items]
Total segment revenue	1,049,324	996,300	655,062
Intersegment revenue	656,614	441,436	138,352
Revenue from external customers	392,710	554,864	516,710
Depreciation and amortisation	127,364	55,513	36,001
Interest income	141,262	117,878	130,003
Interest expense	134,248	119,037	103,782
Employee benefit expense	18,409	1,742	861
Loss on abandonment of property, plant and equipment	4	0	0
Increase in provisions, net	2,408	356	(967)
Operating profit (loss)	(489,585)	102,421	113,296
Profit (loss) related to associates and joint ventures	0	0	0
Segment assets	7,833,516	7,816,885	7,798,400
Investments in associates and joint ventures	0	0	0
Acquisition of non-current assets	344,795	382,978	569,447
Segment liabilities	3,531,496	3,165,286	3,013,743
Material reconciling items
Disclosure of operating segments [Line Items]
Total segment revenue	(36,629,136)	(37,229,118)	(35,638,947)
Intersegment revenue	(36,629,136)	(37,229,118)	(35,638,947)
Revenue from external customers	0	0	0
Depreciation and amortisation	(121,626)	(56,949)	(59,586)
Interest income	(33,739)	(44,276)	(24,542)
Interest expense	(34,748)	(43,636)	(28,847)
Employee benefit expense	(12,087)	(30,480)	(30,467)
Loss on abandonment of property, plant and equipment	0	0	0
Increase in provisions, net	(251,804)	7,989	(386,747)
Operating profit (loss)	(295,552)	(127,741)	167,055
Profit (loss) related to associates and joint ventures	0	0	0
Segment assets	(37,894,980)	(38,574,367)	(38,772,778)
Investments in associates and joint ventures	0	0	0
Acquisition of non-current assets	(81,555)	(62,717)	23,616
Segment liabilities	(1,325,234)	(1,656,247)	₩ (1,714,005)
Elimination of intersegment amounts
Disclosure of operating segments [Line Items]
Segment assets	(39,207,636)	(41,026,970)
Investments in associates and joint ventures	0	0
Acquisition of non-current assets	(81,555)	(62,717)
Segment liabilities	(6,654,717)	(5,055,737)
Equity method adjustment
Disclosure of operating segments [Line Items]
Segment assets	1,791,844	964,234
Investments in associates and joint ventures	0	0
Acquisition of non-current assets	0	0
Segment liabilities	0	0
Deferred taxes
Disclosure of operating segments [Line Items]
Segment assets	2,048	2,131
Investments in associates and joint ventures	0	0
Acquisition of non-current assets	0	0
Segment liabilities	5,329,158	(621)
Others
Disclosure of operating segments [Line Items]
Segment assets	(481,236)	1,486,238
Investments in associates and joint ventures	0	0
Acquisition of non-current assets	0	0
Segment liabilities	₩ 325	₩ 3,400,111

Geographical areas (Details)

Geographical areas (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue
Electricity		₩ 55,939,001	₩ 56,842,011	₩ 54,649,882
Heat supply		220,948	216,117	205,838
Others		734,927	839,676	916,828
Sales of goods		56,894,876	57,897,804	55,772,548
Sales of services		408,290	392,867	351,157
Sales of construction services		1,264,916	1,742,391	3,212,184
Total revenue from external customers		58,568,082	60,033,062	59,335,889
Non-current assets	[1]	172,110,120	160,336,774	157,934,345
Domestic
Revenue
Electricity		55,939,001	56,842,011	54,649,882
Heat supply		220,948	216,117	205,838
Others		449,381	456,738	517,596
Sales of goods		56,609,330	57,514,866	55,373,316
Sales of services		222,106	176,539	186,990
Sales of construction services		110,692	108,586	92,501
Total revenue from external customers		56,942,128	57,799,991	55,652,807
Non-current assets	[1]	169,366,365	157,037,428	153,436,810
Overseas
Revenue
Electricity		0	0	0
Heat supply		0	0	0
Others		285,546	382,938	399,232
Sales of goods		285,546	382,938	399,232
Sales of services		186,184	216,328	164,167
Sales of construction services		1,154,224	1,633,805	3,119,683
Total revenue from external customers	[2]	1,625,954	2,233,071	3,683,082
Non-current assets	[1],[2]	₩ 2,743,755	₩ 3,299,346	₩ 4,497,535
[1]	Amount excludes financial assets and deferred tax assets
[2]	Middle East and other Asian countries make up the majority of overseas revenue and non-current assets. Since the overseas revenue or non-current assets attributable to particular countries are not material, they are not disclosed individually.

Classification of Financial I_3

Classification of Financial Instruments - Classification of financial assets (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of Classification by categories of financial assets [Line Items]
Cash and cash equivalents	₩ 1,810,129		₩ 1,358,345	₩ 2,369,739	₩ 3,051,353
Categories of current financial assets
Current financial assets at fair value through profit or loss	131,385		313,893
Current financial assets at amortised cost	12,302		11,956
Current Derivative assets	27,618		42,107	12,935
Other financial assets	1,415,204		1,991,939
Trade and other receivables	7,701,452		7,793,592
Total current financial assets And Cash and cash equivalents	11,098,090		11,511,832
Non-Financial Assets
Non-current financial assets at fair value through profit or loss	615,876		607,042
Non-current financial assets at fair value through other comprehensive income	379,170		399,495
Non-current financial assets at amortised cost	1,307		2,086
Non-current Derivative assets	283,415		60,228	₩ 19,691
Other financial assets	1,283,730		1,044,762
Trade and other receivables	2,002,297	₩ 1,819,835	1,819,845
Total non-current financial assets	4,565,795		3,933,458
Total financial assets	15,663,885		15,445,290
Financial assets at fair value through profit or loss
Disclosure of Classification by categories of financial assets [Line Items]
Cash and cash equivalents	0		0
Categories of current financial assets
Current financial assets at fair value through profit or loss	131,385		313,893
Current financial assets at amortised cost	0		0
Current Derivative assets	21		13,936
Other financial assets	0		0
Trade and other receivables	0		0
Total current financial assets And Cash and cash equivalents	131,406		327,829
Non-Financial Assets
Non-current financial assets at fair value through profit or loss	615,876		607,042
Non-current financial assets at fair value through other comprehensive income	0		0
Non-current financial assets at amortised cost	0		0
Non-current Derivative assets	165,183		23,695
Other financial assets	0		0
Trade and other receivables	0		0
Total non-current financial assets	781,059		630,737
Total financial assets	912,465		958,566
Financial assets at fair value through other comprehensive income
Disclosure of Classification by categories of financial assets [Line Items]
Cash and cash equivalents	0		0
Categories of current financial assets
Current financial assets at fair value through profit or loss	0		0
Current financial assets at amortised cost	0		0
Current Derivative assets	0		0
Other financial assets	0		0
Trade and other receivables	0		0
Total current financial assets And Cash and cash equivalents	0		0
Non-Financial Assets
Non-current financial assets at fair value through profit or loss	0		0
Non-current financial assets at fair value through other comprehensive income	379,170		399,495
Non-current financial assets at amortised cost	0		0
Non-current Derivative assets	0		0
Other financial assets	0		0
Trade and other receivables	0		0
Total non-current financial assets	379,170		399,495
Total financial assets	379,170		399,495
Financial assets at amortized cost
Disclosure of Classification by categories of financial assets [Line Items]
Cash and cash equivalents	1,810,129		1,358,345
Categories of current financial assets
Current financial assets at fair value through profit or loss	0		0
Current financial assets at amortised cost	12,302		11,956
Current Derivative assets	0		0
Other financial assets	1,415,204		1,991,939
Trade and other receivables	7,701,452		7,793,592
Total current financial assets And Cash and cash equivalents	10,939,087		11,155,832
Non-Financial Assets
Non-current financial assets at fair value through profit or loss	0		0
Non-current financial assets at fair value through other comprehensive income	0		0
Non-current financial assets at amortised cost	1,307		2,086
Non-current Derivative assets	0		0
Other financial assets	1,283,730		1,044,762
Trade and other receivables	2,002,297		1,819,845
Total non-current financial assets	3,287,334		2,866,693
Total financial assets	14,226,421		14,022,525
Derivative assets (applying hedge accounting)
Disclosure of Classification by categories of financial assets [Line Items]
Cash and cash equivalents	0		0
Categories of current financial assets
Current financial assets at fair value through profit or loss	0		0
Current financial assets at amortised cost	0		0
Current Derivative assets	27,597		28,171
Other financial assets	0		0
Trade and other receivables	0		0
Total current financial assets And Cash and cash equivalents	27,597		28,171
Non-Financial Assets
Non-current financial assets at fair value through profit or loss	0		0
Non-current financial assets at fair value through other comprehensive income	0		0
Non-current financial assets at amortised cost	0		0
Non-current Derivative assets	118,232		36,533
Other financial assets	0		0
Trade and other receivables	0		0
Total non-current financial assets	118,232		36,533
Total financial assets	₩ 145,829		₩ 64,704

Classification of Financial I_4

Classification of Financial Instruments - Classification of financial liabilities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017
Categories of current financial liabilities
Borrowings	₩ 1,315,134		₩ 1,172,624
Debt securities	7,542,705		6,788,824
Derivative liabilities	73,064		20,431	₩ 71,267
Trade and other payables	6,649,402	₩ 6,915,699	6,405,395
Total current financial liabilities	15,580,305		14,387,274
Categories of non-current financial liabilities
Borrowings	3,389,743		3,258,015
Debt securities	55,628,959		49,815,164
Derivative liabilities	96,896		291,732	₩ 356,792
Trade and other payables	6,965,760	₩ 7,374,976	2,941,696
Total non-current financial liabilities	66,081,358		56,306,607
Total financial liabilities	81,661,663		70,693,881
Financial liabilities at fair value through profit or loss
Categories of current financial liabilities
Borrowings	0		0
Debt securities	0		0
Derivative liabilities	13,286		13,706
Trade and other payables	0		0
Total current financial liabilities	13,286		13,706
Categories of non-current financial liabilities
Borrowings	0		0
Debt securities	0		0
Derivative liabilities	39,861		85,304
Trade and other payables	0		0
Total non-current financial liabilities	39,861		85,304
Total financial liabilities	53,147		99,010
Financial liabilities recognized at amortized cost
Categories of current financial liabilities
Borrowings	1,315,134		1,172,624
Debt securities	7,542,705		6,788,824
Derivative liabilities	0		0
Trade and other payables	6,649,402		6,405,395
Total current financial liabilities	15,507,241		14,366,843
Categories of non-current financial liabilities
Borrowings	3,389,743		3,258,015
Debt securities	55,628,959		49,815,164
Derivative liabilities	0		0
Trade and other payables	6,965,760		2,941,696
Total non-current financial liabilities	65,984,462		56,014,875
Total financial liabilities	81,491,703		70,381,718
Derivative liabilities (using hedge accounting)
Categories of current financial liabilities
Borrowings	0		0
Debt securities	0		0
Derivative liabilities	59,778		6,725
Trade and other payables	0		0
Total current financial liabilities	59,778		6,725
Categories of non-current financial liabilities
Borrowings	0		0
Debt securities	0		0
Derivative liabilities	57,035		206,428
Trade and other payables	0		0
Total non-current financial liabilities	57,035		206,428
Total financial liabilities	₩ 116,813		₩ 213,153

Classification of Financial I_5

Classification of Financial Instruments - Classification of comprehensive income (loss) from financial instruments (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income, expense, gains or losses of financial instruments
Interest income	₩ 268,118	₩ 223,767	₩ 206,143
Dividends income	13,838	12,777	11,477
Impairment of available-for-sale financial assets	0	0	(2,713)
Gain (loss) on valuation of derivatives	317,350	153,203	(874,667)
Gain (loss) on valuation of financial assets	32,233	25,430
Interest expense of trade and other payables	(94,019)	(42,830)	(57,160)
Interest expense of others	(558,464)	(505,112)	(491,665)
Cash and Cash Equivalents
Income, expense, gains or losses of financial instruments
Interest income	42,861	40,704	35,474
Financial assets available-for-sale
Income, expense, gains or losses of financial instruments
Dividends income			11,477
Impairment of available-for-sale financial assets			(2,713)
Gain (loss) on disposal of available-for-sale financial assets			(1,213)
Financial assets at fair value through profit or loss
Income, expense, gains or losses of financial instruments
Interest income	29,411	21,713	290
Gain (loss) on valuation of derivatives	151,604	34,117	(214,100)
Gain (loss) on transaction of derivatives	63,329	39,114	(37,266)
Gain (loss) on valuation of financial assets	1,062	1,879	12
Gain on disposal of financial assets	1,760	1,837
Financial assets at fair value through other comprehensive income
Income, expense, gains or losses of financial instruments
Dividends income	13,838	12,777
Financial assets at amortized cost
Income, expense, gains or losses of financial instruments
Interest income	539	89
Loans and receivables
Income, expense, gains or losses of financial instruments
Interest income	63,448	21,925	30,014
Trade and other receivables
Income, expense, gains or losses of financial instruments
Interest income	69,941	90,390	102,727
Held-to-maturity investments
Income, expense, gains or losses of financial instruments
Interest income			82
Short-term financial instruments
Income, expense, gains or losses of financial instruments
Interest income	49,070	41,025	29,412
Long-term financial instruments
Income, expense, gains or losses of financial instruments
Interest income	12,794	7,920	8,144
Other financial assets
Income, expense, gains or losses of financial instruments
Interest income	54	1
Derivative assets (applying hedge accounting)
Income, expense, gains or losses of financial instruments
Gain (loss) on valuation of derivatives	123,730	69,799	(41,129)
Gain (loss) on transaction of derivatives	65,651	34,152	(58,299)
Gain (loss) on valuation of derivatives (equity, before tax)	38,305	8,600	2,453
Financial liabilities carried at amortized cost
Income, expense, gains or losses of financial instruments
Interest expense of borrowings and debt securities	(1,394,328)	(1,320,516)	(1,240,727)
Interest expense of trade and other payables	(94,019)	(42,830)	(57,160)
Interest expense of others	(558,464)	(505,112)	(491,665)
Loss on retirement of financial liabilities			(5)
Gain (loss) on foreign currency transactions and translations	(406,175)	(356,159)	1,075,215
Financial liabilities at fair value through profit or loss
Income, expense, gains or losses of financial instruments
Gain (loss) on valuation of derivatives	27,686	(4,650)	(179,879)
Gain (loss) on transaction of derivatives	(493)	36,046	(27,175)
Derivative liabilities (using hedge accounting)
Income, expense, gains or losses of financial instruments
Gain (loss) on valuation of derivatives	14,330	53,937	(439,559)
Gain (loss) on transaction of derivatives	(42,072)	37,985	(46,221)
Gain (loss) on valuation of derivatives (equity, before tax)	₩ (2,578)	₩ (15,029)	₩ 29,431

Restricted Deposits (Details)

Restricted Deposits (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2019	Dec. 31, 2018
Restricted Deposits [Line Items]
Total Restricted Deposits		₩ 1,173,068	₩ 1,126,975
Cash and Cash Equivalents
Restricted Deposits [Line Items]
Deposits for government project		9,287	12,747
Collateral provided for borrowings		63,198	100,998
Collateral provided for lawsuit		3	3
Deposits for transmission regional support program		3,002	4,337
Decommissioning costs of nuclear power plants			604
Total Restricted Deposits		75,490	118,689
Short-term financial instruments
Restricted Deposits [Line Items]
Restriction on withdrawal related to 'win-win growth program' for small and medium enterprises		93,000	34,000
Total Restricted Deposits		93,000	34,000
Current financial assets at fair value through profit or loss
Restricted Deposits [Line Items]
Decommissioning costs of nuclear power plants		0	29,451
Total Restricted Deposits		0	29,451
Non-Current financial assets at fair value through profit or loss
Restricted Deposits [Line Items]
Decommissioning costs of nuclear power plants		541,969	498,555
Total Restricted Deposits		541,969	498,555
Long-term financial instruments
Restricted Deposits [Line Items]
Escrow accounts		74	69
Collateral provided for borrowings		11,745
Decommissioning costs of nuclear power plants		250,464	245,896
Guarantee deposits for banking accounts at oversea branches		326	315
Funds for developing small and medium enterprises	[1]	200,000	200,000
Total Restricted Deposits		₩ 462,609	₩ 446,280
[1]	Deposits for small and medium enterprise at the Industrial Bank of Korea (IBK) and others for construction of Bitgaram Energy Valley businesses as of December 31, 2018 and 2019.

Cash and Cash Equivalents (Deta

Cash and Cash Equivalents (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash and Cash Equivalents [Abstract]
Total cash	₩ 266	₩ 138
Demand Deposit Accounts	1,117,499	927,650
Short-term deposits, classified as cash equivalents	527,235	211,424
Short-term investments, classified as cash equivalents	165,129	219,133
Total cash and cash equivalents	₩ 1,810,129	₩ 1,358,345	₩ 2,369,739	₩ 3,051,353

Trade and Other Receivables - T

Trade and Other Receivables - Trade and other receivables (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2019	Dec. 31, 2018
Trade and Other Receivables [Line Items]
Gross amount	₩ 2,552,077	₩ 2,225,024
Allowance for doubtful accounts	(114,155)	(104,726)
Present value discount	(6,976)	(8,928)
Trade and other receivables	2,430,946	2,111,370
Current assets
Trade and Other Receivables [Line Items]
Gross amount	7,939,830	8,031,625
Allowance for doubtful accounts	(236,084)	(236,006)
Present value discount	(2,294)	(2,027)
Trade and other receivables	7,701,452	7,793,592
Current assets | Trade receivables
Trade and Other Receivables [Line Items]
Gross amount	7,147,683	7,303,065
Allowance for doubtful accounts	(208,505)	(215,775)
Present value discount	0	0
Trade and other receivables	6,939,178	7,087,290
Current assets | Other receivables
Trade and Other Receivables [Line Items]
Gross amount	792,147	728,560
Allowance for doubtful accounts	(27,579)	(20,231)
Present value discount	(2,294)	(2,027)
Trade and other receivables	762,274	706,302
Current assets | Non-trade receivables
Trade and Other Receivables [Line Items]
Gross amount	376,438	298,587
Allowance for doubtful accounts	(27,201)	(19,940)
Present value discount	0	0
Trade and other receivables	349,237	278,647
Current assets | Accrued income
Trade and Other Receivables [Line Items]
Gross amount	68,921	102,023
Allowance for doubtful accounts	0	0
Present value discount	0	0
Trade and other receivables	68,921	102,023
Current assets | Deposits
Trade and Other Receivables [Line Items]
Gross amount	273,887	228,466
Allowance for doubtful accounts	0	0
Present value discount	(2,294)	(2,027)
Trade and other receivables	271,593	226,439
Current assets | Finance lease receivables
Trade and Other Receivables [Line Items]
Gross amount	60,304	84,688
Allowance for doubtful accounts	(378)	(291)
Present value discount	0	0
Trade and other receivables	59,926	84,397
Current assets | Others
Trade and Other Receivables [Line Items]
Gross amount	12,597	14,796
Allowance for doubtful accounts	0	0
Present value discount	0	0
Trade and other receivables	12,597	14,796
Non-current assets
Trade and Other Receivables [Line Items]
Gross amount	2,098,191	1,911,782
Allowance for doubtful accounts	(90,830)	(84,588)
Present value discount	(5,064)	(7,349)
Trade and other receivables	2,002,297	1,819,845
Non-current assets | Trade receivables
Trade and Other Receivables [Line Items]
Gross amount	338,261	415,318
Allowance for doubtful accounts	(4,254)	(93)
Present value discount	(382)	(448)
Trade and other receivables	333,625	414,777
Non-current assets | Other receivables
Trade and Other Receivables [Line Items]
Gross amount	1,759,930	1,496,464
Allowance for doubtful accounts	(86,576)	(84,495)
Present value discount	(4,682)	(6,901)
Trade and other receivables	1,668,672	1,405,068
Non-current assets | Non-trade receivables
Trade and Other Receivables [Line Items]
Gross amount	196,821	136,432
Allowance for doubtful accounts	(78,654)	(77,475)
Present value discount	0	0
Trade and other receivables	118,167	58,957
Non-current assets | Accrued income
Trade and Other Receivables [Line Items]
Gross amount	2,222	0
Allowance for doubtful accounts	0	0
Present value discount	0	0
Trade and other receivables	2,222	0
Non-current assets | Deposits
Trade and Other Receivables [Line Items]
Gross amount	338,989	376,211
Allowance for doubtful accounts	0	0
Present value discount	(4,682)	(6,901)
Trade and other receivables	334,307	369,310
Non-current assets | Finance lease receivables
Trade and Other Receivables [Line Items]
Gross amount	1,118,537	898,658
Allowance for doubtful accounts	(484)	(842)
Present value discount	0	0
Trade and other receivables	1,118,053	897,816
Non-current assets | Others
Trade and Other Receivables [Line Items]
Gross amount	103,361	85,163
Allowance for doubtful accounts	(7,438)	(6,178)
Present value discount	0	0
Trade and other receivables	₩ 95,923	₩ 78,985

Trade and Other Receivables - O

Trade and Other Receivables - Other receivables (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2019	Dec. 31, 2018
Trade and Other Receivables [Line Items]
Trade receivables Face value	₩ 7,485,944	₩ 7,718,383
Trade receivables Allowance for doubtful accounts	(212,759)	(215,868)
Trade receivables Present value discount	(382)	(448)
Trade receivables	7,272,803	7,502,067
Other receivables Face value	2,552,077	2,225,024
Other receivables Allowance for doubtful accounts	(114,155)	(104,726)
Other receivables Present value discount	(6,976)	(8,928)
Other receivables	2,430,946	2,111,370
Current
Trade and Other Receivables [Line Items]
Trade receivables Face value	7,338,757	7,419,648
Other receivables Face value	2,327,640	2,075,601
Less than 60 days
Trade and Other Receivables [Line Items]
Trade receivables Face value	0	0
Other receivables Face value	0	0
Trade and Other receivables: (impairment reviewed)
Trade and Other Receivables [Line Items]
Trade receivables Face value	147,187	298,735
Other receivables Face value	224,437	149,423
Less than 60 days
Trade and Other Receivables [Line Items]
Trade receivables Face value	6,555	2,525
Other receivables Face value	98,220	24,782
60 ~ 90 days
Trade and Other Receivables [Line Items]
Trade receivables Face value	1,899	37,266
Other receivables Face value	2,034	1,007
90 ~ 120 days
Trade and Other Receivables [Line Items]
Trade receivables Face value	2,106	16,033
Other receivables Face value	14,135	10,997
120 days ~ 1year
Trade and Other Receivables [Line Items]
Trade receivables Face value	37,357	46,204
Other receivables Face value	26,212	23,991
Over 1 year
Trade and Other Receivables [Line Items]
Trade receivables Face value	99,270	196,707
Other receivables Face value	₩ 83,836	₩ 88,646

Trade and Other Receivables - C

Trade and Other Receivables - Changes in the allowance for doubtful accounts (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Trade receivables
Reconciliation of changes in allowance account for credit losses of financial assets [Line Items]
Beginning balance	₩ 215,868	₩ 173,583	₩ 71,985
Effect of change in accounting policy	0	6,641
Loss allowance as at January 1 under IFRS 9	215,868	180,224
Changes in allowance account for credit losses of financial assets
Bad debt expense	29,221	41,498	126,714
Write-off	(10,106)	(7,696)	(32,995)
Reversal	(41,940)	(1,726)	0
Others	19,716	3,568	7,879
Ending balance	212,759	215,868	173,583
Other receivables
Reconciliation of changes in allowance account for credit losses of financial assets [Line Items]
Beginning balance	104,726	78,008	87,661
Effect of change in accounting policy	0	128
Loss allowance as at January 1 under IFRS 9	104,726	78,136
Changes in allowance account for credit losses of financial assets
Bad debt expense	19,206	17,817	1,778
Write-off	(1,146)	(244)	(3,129)
Reversal	0	(143)	(2,166)
Others	(8,631)	9,160	(6,136)
Ending balance	₩ 114,155	₩ 104,726	₩ 78,008

Financial Assets at Fair Valu_5

Financial Assets at Fair Value through Profit or Loss (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2019	Dec. 31, 2018
Financial Assets At Fair Value Through Profit Or Loss [Line Items]
Current financial assets at fair value through profit or loss	₩ 131,385	₩ 313,893
Non-current financial assets at fair value through profit or loss	615,876	607,042
Financial assets at fair value through profit or loss
Financial Assets At Fair Value Through Profit Or Loss [Line Items]
Current financial assets at fair value through profit or loss	131,385	313,893
Non-current financial assets at fair value through profit or loss	410,964	408,786
Financial assets at fair value through profit or loss | Beneficiary securities
Financial Assets At Fair Value Through Profit Or Loss [Line Items]
Current financial assets at fair value through profit or loss	894	100
Non-current financial assets at fair value through profit or loss	160,952	320,148
Financial assets at fair value through profit or loss | Cooperative securities
Financial Assets At Fair Value Through Profit Or Loss [Line Items]
Current financial assets at fair value through profit or loss	0	0
Non-current financial assets at fair value through profit or loss	5,155	5,052
Financial assets at fair value through profit or loss | Other
Financial Assets At Fair Value Through Profit Or Loss [Line Items]
Current financial assets at fair value through profit or loss	130,491	313,793
Non-current financial assets at fair value through profit or loss	244,857	83,586
Financial assets designated as at fair value through profit or loss
Financial Assets At Fair Value Through Profit Or Loss [Line Items]
Current financial assets at fair value through profit or loss	0	0
Non-current financial assets at fair value through profit or loss	204,912	198,256
Financial assets designated as at fair value through profit or loss | Debt with embedded derivatives
Financial Assets At Fair Value Through Profit Or Loss [Line Items]
Current financial assets at fair value through profit or loss	0	0
Non-current financial assets at fair value through profit or loss	150,916	187,483
Financial assets designated as at fair value through profit or loss | Other
Financial Assets At Fair Value Through Profit Or Loss [Line Items]
Current financial assets at fair value through profit or loss	0	0
Non-current financial assets at fair value through profit or loss	₩ 53,996	₩ 10,773

Gains (losses) on financial ass

Gains (losses) on financial assets at fair value through profit or loss (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Financial Assets At Fair Value Through Profit Or Loss [Line Items]
Gains (losses) on financial assets at fair value through profit or loss	₩ 32,233	₩ 25,430
Financial assets at fair value through profit or loss | Beneficiary securities
Financial Assets At Fair Value Through Profit Or Loss [Line Items]
Gains (losses) on financial assets at fair value through profit or loss	12,458	6,892
Financial assets at fair value through profit or loss | Cooperative securities
Financial Assets At Fair Value Through Profit Or Loss [Line Items]
Gains (losses) on financial assets at fair value through profit or loss	76	626
Financial assets at fair value through profit or loss | Debt with embedded derivatives
Financial Assets At Fair Value Through Profit Or Loss [Line Items]
Gains (losses) on financial assets at fair value through profit or loss	2,697	4,804
Financial assets at fair value through profit or loss | Other
Financial Assets At Fair Value Through Profit Or Loss [Line Items]
Gains (losses) on financial assets at fair value through profit or loss	₩ 17,002	₩ 13,108

Changes in financial assets at

Changes in financial assets at fair value through other comprehensive income (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2019		Dec. 31, 2018
Changes in financial assets at fair value through other comprehensive income [Line Items]
Beginning balance		₩ 399,495		₩ 0
Effect of change in accounting policy		0		471,903
Acquisition		1,876		0
Disposal		(19,315)		(1)
Valuation		(8,019)		(75,077)
Impairment		0		0
Others		5,133		2,670
Ending Balance		379,170		399,495
Listed equity securities
Changes in financial assets at fair value through other comprehensive income [Line Items]
Beginning balance		210,056		0
Effect of change in accounting policy		0		274,453
Acquisition		0		0
Disposal		0		(1)
Valuation		(11,734)		(63,007)
Impairment		0		0
Others		2,880		(1,389)
Ending Balance		201,202		210,056
Unlisted equity securities
Changes in financial assets at fair value through other comprehensive income [Line Items]
Beginning balance		189,439	[1]	0
Effect of change in accounting policy		0		197,450
Acquisition		1,876		0
Disposal		(19,315)		0
Valuation		3,715		(12,070)
Impairment		0		0
Others		2,253		4,059
Ending Balance	[1]	177,968		189,439
Current Financial assets at fair value through profit or loss, category
Changes in financial assets at fair value through other comprehensive income [Line Items]
Beginning balance		0		0
Effect of change in accounting policy		0		0
Acquisition		0		0
Disposal		0		0
Valuation		0		0
Impairment		0		0
Others		0		0
Ending Balance		0		0
Non-Current Financial assets at fair value through profit or loss, category
Changes in financial assets at fair value through other comprehensive income [Line Items]
Beginning balance		399,495		0
Effect of change in accounting policy		0		471,903
Acquisition		1,876		0
Disposal		(19,315)		(1)
Valuation		(8,019)		(75,077)
Impairment		0		0
Others		5,134		2,670
Ending Balance		₩ 379,170		₩ 399,495
[1]	The Company used initial cost as their fair value because there was not enough information to determine fair value, and the range of the estimated fair value is wide.

Financial Assets at Fair Valu_6

Financial Assets at Fair Value through Other Comprehensive Income (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Financial assets at fair value through other comprehensive income [Line Items]
Acquisition Cost		₩ 626,056		₩ 650,513
Book value		379,170		399,495		₩ 0
Fair value		379,170		399,495
Listed equity securities
Financial assets at fair value through other comprehensive income [Line Items]
Acquisition Cost		359,339		365,843
Book value		201,202		210,056		0
Fair value		₩ 201,202		₩ 210,056
Korea District Heating Corp.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		2,264,068		2,264,068
Ownership		19.55%		19.55%
Acquisition Cost		₩ 173,201		₩ 173,201
Book value		107,090		129,051
Fair value		₩ 107,090		₩ 129,051
Ssangyong Motor Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		38,568		38,568
Ownership		0.03%		0.03%
Acquisition Cost		₩ 428		₩ 428
Book value		80		153
Fair value		₩ 80		₩ 153
SM Korea Line Corp.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		18		18
Ownership		0.00%		0.00%
Acquisition Cost		₩ 1		₩ 1
Book value		0		0
Fair value		₩ 0		₩ 0
Namkwang Engineering & Construction Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		121		121
Ownership		0.00%		0.00%
Acquisition Cost		₩ 15		₩ 15
Book value		1		1
Fair value		₩ 1		₩ 1
Bumyang Construction Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		35		35
Ownership		0.00%		0.00%
Acquisition Cost		₩ 2		₩ 2
Book value		0		0
Fair value		₩ 0		₩ 0
ELCOMTEC Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		32,875		32,875
Ownership		0.04%		0.04%
Acquisition Cost		₩ 217		₩ 217
Book value		52		61
Fair value		₩ 52		₩ 61
PAN ocean Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,492		1,492
Ownership		0.00%		0.00%
Acquisition Cost		₩ 14		₩ 14
Book value		7		7
Fair value		₩ 7		₩ 7
Dongbu Corporation
Financial assets at fair value through other comprehensive income [Line Items]
Shares		955		955
Ownership		0.00%		0.02%
Acquisition Cost		₩ 12		₩ 12
Book value		8		7
Fair value		₩ 8		₩ 7
KSP Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		22,539		22,539
Ownership		0.06%		0.08%
Acquisition Cost		₩ 24		₩ 24
Book value		40		32
Fair value		₩ 40		₩ 32
STX Heavy Industries Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		8,639		5,057
Ownership		0.03%		0.13%
Acquisition Cost		₩ 213		₩ 191
Book value		26		29
Fair value		₩ 26		₩ 29
Codes Combine Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		291		291
Ownership		0.00%		0.00%
Acquisition Cost		₩ 1		₩ 1
Book value		1		1
Fair value		₩ 1		₩ 1
PT Adaro Energy Tbk
Financial assets at fair value through other comprehensive income [Line Items]
Shares		480,000,000		480,000,000
Ownership		1.50%		1.50%
Acquisition Cost		₩ 65,028		₩ 71,554
Book value		62,026		44,790
Fair value		₩ 62,026		₩ 44,790
Energy Fuels Inc.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,711,814		1,711,814
Ownership		1.91%		1.91%
Acquisition Cost		₩ 16,819		₩ 16,819
Book value		3,764		5,435
Fair value		₩ 3,764		₩ 5,435
Bunji Corporation Limited (formerly, Baralaba Coal Company Limited)
Financial assets at fair value through other comprehensive income [Line Items]
Shares		99,763		99,763
Ownership		0.07%		0.07%
Acquisition Cost		₩ 18,445		₩ 18,445
Book value		0		0
Fair value		₩ 0		₩ 0
Denison Mines Corp.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		58,284,000		58,284,000
Ownership		10.42%		10.42%
Acquisition Cost		₩ 84,134		₩ 84,134
Book value		27,903		30,122
Fair value		₩ 27,903		₩ 30,122
Fission 3.0
Financial assets at fair value through other comprehensive income [Line Items]
Shares		75,000		75,000	[1]
Ownership		0.14%		0.14%	[1]
Acquisition Cost		₩ 0		₩ 0	[1]
Book value		5		13	[1]
Fair value		₩ 5		₩ 13	[1]
Fission Uranium Corp.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		800,000		800,000
Ownership		0.16%		0.16%
Acquisition Cost		₩ 785		₩ 785
Book value		199		354
Fair value		199		354
Unlisted equity securities
Financial assets at fair value through other comprehensive income [Line Items]
Acquisition Cost	[2]	266,717		284,670
Book value		177,968	[2]	189,439	[2]	₩ 0
Fair value	[2]	₩ 177,968		₩ 189,439
Intellectual Discovery, Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,000,000		1,000,000
Ownership		6.00%		8.81%
Acquisition Cost		₩ 5,000		₩ 5,000
Book value		954		954
Fair value		₩ 954		₩ 954
Hwan Young Steel Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		10,916		10,916
Ownership		0.14%		0.14%
Acquisition Cost		₩ 1,092		₩ 1,092
Book value		97		97
Fair value		₩ 97		₩ 97
SAMBO AUTO. Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		15,066		15,066
Ownership		0.02%		0.02%
Acquisition Cost		₩ 38		₩ 38
Book value		38		38
Fair value		₩ 38		₩ 38
Mobo Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		504		504
Ownership		0.00%		0.00%
Acquisition Cost		₩ 14		₩ 14
Book value		14		14
Fair value		₩ 14		₩ 14
Dae Kwang Semiconductor Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		589		589
Ownership		0.07%		0.07%
Acquisition Cost		₩ 6		₩ 6
Book value		6		6
Fair value		₩ 6		₩ 6
Sanbon Department Store
Financial assets at fair value through other comprehensive income [Line Items]
Shares		828		828
Ownership		0.01%		0.01%
Acquisition Cost		₩ 124		₩ 124
Book value		3		3
Fair value		₩ 3		₩ 3
Miju Steel Mfg. Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,097		1,097
Ownership		0.23%		0.23%
Acquisition Cost		₩ 50		₩ 50
Book value		50		50
Fair value		₩ 50		₩ 50
Sungwon Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		117		117	[3]
Ownership		0.07%		0.07%	[3]
Acquisition Cost		₩ 15		₩ 15	[3]
Book value		15		15	[3]
Fair value		₩ 15		₩ 15	[3]
Hana Civil Engineering Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		23		23
Ownership		0.00%		0.00%
Acquisition Cost		₩ 1		₩ 1
Book value		1		1
Fair value		₩ 1		₩ 1
KC Development Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		839		839
Ownership		0.02%		0.02%
Acquisition Cost		₩ 6		₩ 6
Book value		6		6
Fair value		₩ 6		₩ 6
IMHWA Corp.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		329		329
Ownership		0.11%		0.11%
Acquisition Cost		₩ 5		₩ 5
Book value		5		5
Fair value		₩ 5		₩ 5
DALIM Special Vehicle Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		58		58
Ownership		0.08%		0.08%
Acquisition Cost		₩ 10		₩ 10
Book value		10		10
Fair value		₩ 10		₩ 10
ASA JEONJU Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		34,846		34,846
Ownership		1.34%		1.34%
Acquisition Cost		₩ 697		₩ 697
Book value		69		69
Fair value		₩ 69		₩ 69
Moonkyung Silica Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		42		42
Ownership		0.56%		0.56%
Acquisition Cost		₩ 0		₩ 0
Book value		0		0
Fair value		₩ 0		₩ 0
Sungkwang Timber Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		3		9
Ownership		0.08%		0.34%
Acquisition Cost		₩ 5		₩ 4
Book value		5		4
Fair value		₩ 5		₩ 4
Yongbo Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		61		61
Ownership		0.20%		0.20%
Acquisition Cost		₩ 3		₩ 3
Book value		3		3
Fair value		₩ 3		₩ 3
HJ Steel Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		218		218
Ownership		0.07%		0.07%
Acquisition Cost		₩ 2		₩ 2
Book value		2		2
Fair value		₩ 2		₩ 2
KS Remicon Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		12		12
Ownership		0.04%		0.04%
Acquisition Cost		₩ 3		₩ 3
Book value		3		3
Fair value		₩ 3		₩ 3
Joongang Platec Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		3,591		3,591
Ownership		0.75%		0.75%
Acquisition Cost		₩ 72		₩ 72
Book value		35		35
Fair value		₩ 35		₩ 35
Pyungsan SI Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		434		434
Ownership		0.01%		0.01%
Acquisition Cost		₩ 9		₩ 9
Book value		9		9
Fair value		₩ 9		₩ 9
Samgong Development Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		12		12
Ownership		0.01%		0.01%
Acquisition Cost		₩ 7		₩ 7
Book value		7		7
Fair value		₩ 7		₩ 7
Joongang Development Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		540		540
Ownership		0.12%		0.12%
Acquisition Cost		₩ 8		₩ 8
Book value		8		8
Fair value		₩ 8		₩ 8
AJS Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		12,906		12,906
Ownership		0.23%		0.23%
Acquisition Cost		₩ 32		₩ 32
Book value		32		32
Fair value		₩ 32		₩ 32
SHIN-E B&P Co, Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares				119
Ownership				0.13%
Acquisition Cost				₩ 10
Book value				0
Fair value				₩ 0
MSE Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		429		429
Ownership		0.13%		0.13%
Acquisition Cost		₩ 9		₩ 9
Book value		9		9
Fair value		₩ 9		₩ 9
Ilrim Nano Tec Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,520		1,520
Ownership		0.07%		0.07%
Acquisition Cost		₩ 15		₩ 15
Book value		15		15
Fair value		₩ 15		₩ 15
Youngjin Hi-Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		2,512		2,512
Ownership		0.25%		0.25%
Acquisition Cost		₩ 126		₩ 126
Book value		21		21
Fair value		₩ 21		₩ 21
Buyoung Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		270		270
Ownership		0.00%		0.00%
Acquisition Cost		₩ 3		₩ 3
Book value		3		3
Fair value		₩ 3		₩ 3
Ilsuk Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		152		152
Ownership		0.17%		0.17%
Acquisition Cost		₩ 10		₩ 10
Book value		10		10
Fair value		₩ 10		₩ 10
Dongyang Telecom Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,760		1,760
Ownership		0.01%		0.01%
Acquisition Cost		₩ 11		₩ 11
Book value		11		11
Fair value		₩ 11		₩ 11
Jongwon Remicon Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		31		31
Ownership		0.18%		0.18%
Acquisition Cost		₩ 13		₩ 13
Book value		13		13
Fair value		₩ 13		₩ 13
Zyle Daewoo Motor Sales Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		22		22
Ownership		0.00%		0.00%
Acquisition Cost		₩ 0		₩ 0
Book value		0		0
Fair value		₩ 0		₩ 0
Daewoo Development Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		8		8
Ownership		0.00%		0.00%
Acquisition Cost		₩ 0		₩ 0
Book value		0		0
Fair value		₩ 0		₩ 0
Seyang Inc.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		537		537
Ownership		0.05%		0.05%
Acquisition Cost		₩ 27		₩ 27
Book value		27		27
Fair value		₩ 27		₩ 27
Seungri Enterprise Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		93		93
Ownership		0.05%		0.05%
Acquisition Cost		₩ 3		₩ 3
Book value		3		3
Fair value		₩ 3		₩ 3
Onggane Food Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares		5		5
Ownership		0.07%		0.07%
Acquisition Cost		₩ 1		₩ 1
Book value		1		1
Fair value		₩ 1		₩ 1
Shin-E P&C Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,569		1,569
Ownership		0.64%		0.64%
Acquisition Cost		₩ 111		₩ 111
Book value		3		3
Fair value		₩ 3		₩ 3
Ejung Ad Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		132		132
Ownership		0.09%		0.09%
Acquisition Cost		₩ 3		₩ 3
Book value		3		3
Fair value		₩ 3		₩ 3
Solvus Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,056		1,056
Ownership		0.04%		0.04%
Acquisition Cost		₩ 3		₩ 3
Book value		3		3
Fair value		₩ 3		₩ 3
Myung Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		89		89
Ownership		0.05%		0.05%
Acquisition Cost		₩ 2		₩ 2
Book value		2		2
Fair value		₩ 2		₩ 2
Shinil Engineering Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		887		887
Ownership		0.06%		0.06%
Acquisition Cost		₩ 3		₩ 3
Book value		3		3
Fair value		₩ 3		₩ 3
Biwang Industry Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares		406		406
Ownership		0.04%		0.04%
Acquisition Cost		₩ 2		₩ 2
Book value		2		2
Fair value		₩ 2		₩ 2
Huimun Co, Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares				263
Ownership				0.26%
Acquisition Cost				₩ 4
Book value				4
Fair value				₩ 4
Young Sung Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		89		89
Ownership		0.40%		0.40%
Acquisition Cost		₩ 27		₩ 26
Book value		27		26
Fair value		₩ 27		₩ 26
Yuil Industrial Electronics Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		804		804
Ownership		0.32%		0.32%
Acquisition Cost		₩ 16		₩ 15
Book value		16		15
Fair value		₩ 16		₩ 15
DN TEK Inc.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		12,401		12,401
Ownership		0.29%		0.29%
Acquisition Cost		₩ 62		₩ 61
Book value		6		5
Fair value		₩ 6		₩ 5
Kwang Jin Structure Co, Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares				3,072
Ownership				0.60%
Acquisition Cost				₩ 31
Book value				31
Fair value				₩ 31
Woojin Industry Corporation
Financial assets at fair value through other comprehensive income [Line Items]
Shares		3		3
Ownership		0.00%		0.00%
Acquisition Cost		₩ 16		₩ 16
Book value		16		16
Fair value		₩ 16		₩ 16
Kwang Sung Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		325		325
Ownership		0.35%		0.35%
Acquisition Cost		₩ 7		₩ 7
Book value		7		7
Fair value		₩ 7		₩ 7
Futech Mold Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		274		274
Ownership		0.27%		0.27%
Acquisition Cost		₩ 14		₩ 14
Book value		14		14
Fair value		₩ 14		₩ 14
Woojoo Environment Ind. Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		101		101
Ownership		0.11%		0.11%
Acquisition Cost		₩ 13		₩ 13
Book value		13		13
Fair value		₩ 13		₩ 13
Hyungji Esquire Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		61		61
Ownership		0.02%		0.02%
Acquisition Cost		₩ 22		₩ 22
Book value		22		22
Fair value		₩ 22		₩ 22
Kolmar Pharma Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,426		1,426
Ownership		0.01%		0.01%
Acquisition Cost		₩ 52		₩ 52
Book value		3		3
Fair value		₩ 3		₩ 3
Morado Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		209		209
Ownership		0.04%		0.04%
Acquisition Cost		₩ 2		₩ 2
Book value		2		2
Fair value		₩ 2		₩ 2
Myung Sung Tex Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		20		20
Ownership		0.00%		0.00%
Acquisition Cost		₩ 2		₩ 2
Book value		2		2
Fair value		₩ 2		₩ 2
Kwang Sung Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		610		610
Ownership		0.53%		0.53%
Acquisition Cost		₩ 31		₩ 31
Book value		31		31
Fair value		₩ 31		₩ 31
Seen Business and Technology co., Ltd. (formerly, EverTechno. Co.,Ltd.)
Financial assets at fair value through other comprehensive income [Line Items]
Shares		29,424		29,424
Ownership		0.73%		0.73%
Acquisition Cost		₩ 147		₩ 148
Book value		7		7
Fair value		₩ 7		₩ 7
Autowel Co,Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares				260
Ownership				0.38%
Acquisition Cost				₩ 14
Book value				14
Fair value				₩ 14
Woobang Construction Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		8		8
Ownership		0.00%		0.00%
Acquisition Cost		₩ 8		₩ 8
Book value		8		8
Fair value		₩ 8		₩ 8
Shin Pyung Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		6		6
Ownership		0.03%		0.03%
Acquisition Cost		₩ 3		₩ 3
Book value		3		3
Fair value		₩ 3		₩ 3
JMC Heavy Industries Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		2,724		2,724
Ownership		0.10%		0.10%
Acquisition Cost		₩ 27		₩ 27
Book value		2		2
Fair value		₩ 2		₩ 2
Najin Steel Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		37		37
Ownership		0.06%		0.06%
Acquisition Cost		₩ 5		₩ 5
Book value		5		5
Fair value		₩ 5		₩ 5
Sinkwang Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,091		1,091
Ownership		1.68%		1.68%
Acquisition Cost		₩ 5		₩ 5
Book value		5		5
Fair value		₩ 5		₩ 5
Crystal Co, Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares				22
Ownership				0.07%
Acquisition Cost				₩ 2
Book value				2
Fair value				₩ 2
Elephant & Friends Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		563		563
Ownership		0.61%		0.61%
Acquisition Cost		₩ 3		₩ 3
Book value		3		3
Fair value		₩ 3		₩ 3
Mireco Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		109		109
Ownership		0.25%		0.25%
Acquisition Cost		₩ 11		₩ 11
Book value		11		11
Fair value		₩ 11		₩ 11
L&K Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,615		1,615
Ownership		0.60%		0.60%
Acquisition Cost		₩ 24		₩ 24
Book value		24		24
Fair value		₩ 24		₩ 24
JO Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,263		1,263
Ownership		0.62%		0.62%
Acquisition Cost		₩ 25		₩ 25
Book value		25		25
Fair value		₩ 25		₩ 25
Kendae Printing Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		422		422
Ownership		0.60%		0.60%
Acquisition Cost		₩ 21		₩ 21
Book value		21		21
Fair value		₩ 21		₩ 21
Dauning Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		231		231
Ownership		0.41%		0.41%
Acquisition Cost		₩ 6		₩ 6
Book value		6		6
Fair value		₩ 6		₩ 6
Korea Trecision Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		22		22
Ownership		0.45%		0.45%
Acquisition Cost		₩ 5		₩ 5
Book value		5		5
Fair value		₩ 5		₩ 5
Ace Track Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		3,130		3,130
Ownership		1.08%		1.08%
Acquisition Cost		₩ 219		₩ 219
Book value		59		59
Fair value		₩ 59		₩ 59
Yoo-A Construction Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		105		105
Ownership		0.20%		0.20%
Acquisition Cost		₩ 11		₩ 11
Book value		11		11
Fair value		₩ 11		₩ 11
Dung Hwan Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		531		531
Ownership		0.02%		0.02%
Acquisition Cost		₩ 5		₩ 5
Book value		5		5
Fair value		₩ 5		₩ 5
Hurim Biocell Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,021		1,021
Ownership		0.00%		0.00%
Acquisition Cost		₩ 5		₩ 5
Book value		5		5
Fair value		₩ 5		₩ 5
Smart Power Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		133,333		133,333
Ownership		4.14%		4.35%
Acquisition Cost		₩ 200		₩ 200
Book value		200		200
Fair value		₩ 200		₩ 200
Sunjin Power Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		4,941		4,941
Ownership		0.92%		0.92%
Acquisition Cost		₩ 247		₩ 247
Book value		32		32
Fair value		₩ 32		₩ 32
Haseung Industries Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		55		55
Ownership		0.62%		0.62%
Acquisition Cost		₩ 28		₩ 28
Book value		28		28
Fair value		₩ 28		₩ 28
Beer Yeast Korea Inc.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,388		1,388
Ownership		0.43%		0.43%
Acquisition Cost		₩ 7		₩ 7
Book value		7		7
Fair value		₩ 7		₩ 7
Korea Bio Red Ginseng Co,Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares				194
Ownership				0.09%
Acquisition Cost				₩ 10
Book value				10
Fair value				₩ 10
B CON Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		96		96
Ownership		1.16%		1.16%
Acquisition Cost		₩ 6		₩ 6
Book value		6		6
Fair value		₩ 6		₩ 6
SsangMa Machine Co, Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares				4
Ownership				0.05%
Acquisition Cost				₩ 1
Book value				1
Fair value				₩ 1
Ace Integration Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares		105		105
Ownership		0.09%		0.09%
Acquisition Cost		₩ 23		₩ 24
Book value		23		24
Fair value		₩ 23		₩ 24
AceInti Agricultural Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		16		16
Ownership		0.02%		0.02%
Acquisition Cost		₩ 5		₩ 5
Book value		5		5
Fair value		₩ 5		₩ 5
KyungDong Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		130		130
Ownership		0.01%		0.01%
Acquisition Cost		₩ 1		₩ 1
Book value		1		1
Fair value		₩ 1		₩ 1
ChunWon Development Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		193		193
Ownership		0.19%		0.19%
Acquisition Cost		₩ 39		₩ 39
Book value		39		39
Fair value		₩ 39		₩ 39
WonIl Co, Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares				999
Ownership				0.15%
Acquisition Cost				₩ 50
Book value				50
Fair value				₩ 50
SungLim Industrial Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		29		29
Ownership		0.03%		0.03%
Acquisition Cost		₩ 1		₩ 1
Book value		1		1
Fair value		₩ 1		₩ 1
Korea Minerals Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		191		191
Ownership		0.05%		0.05%
Acquisition Cost		₩ 135		₩ 134
Book value		1		1
Fair value		₩ 1		₩ 1
HyoDong Development Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		128		119
Ownership		0.15%		0.15%
Acquisition Cost		₩ 25		₩ 24
Book value		25		24
Fair value		₩ 25		₩ 24
Haspe Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		652		652
Ownership		0.55%		0.55%
Acquisition Cost		₩ 20		₩ 20
Book value		20		20
Fair value		₩ 20		₩ 20
JoHyun Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		350		350
Ownership		1.56%		1.56%
Acquisition Cost		₩ 18		₩ 18
Book value		18		18
Fair value		₩ 18		₩ 18
KC Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		5,107		5,107
Ownership		0.17%		0.17%
Acquisition Cost		₩ 26		₩ 26
Book value		26		26
Fair value		₩ 26		₩ 26
SeongJi Industrial Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		41		41
Ownership		0.05%		0.05%
Acquisition Cost		₩ 1		₩ 1
Book value		1		1
Fair value		₩ 1		₩ 1
Dong Yang Metal Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		2,951		2,951
Ownership		1.97%		1.97%
Acquisition Cost		₩ 161		₩ 161
Book value		148		147
Fair value		₩ 148		₩ 147
Seyang Precision Ind.Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		829		829
Ownership		0.23%		0.23%
Acquisition Cost		₩ 41		₩ 41
Book value		41		41
Fair value		₩ 41		₩ 41
Dooriwon Food System Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		13		13
Ownership		0.27%		0.27%
Acquisition Cost		₩ 1		₩ 1
Book value		1		1
Fair value		₩ 1		₩ 1
ShinShin Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		339		339
Ownership		1.12%		1.12%
Acquisition Cost		₩ 17		₩ 17
Book value		17		17
Fair value		₩ 17		₩ 17
Kitorang Co, Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares				165
Ownership				0.24%
Acquisition Cost				₩ 49
Book value				49
Fair value				₩ 49
Sung Kwang Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		23		23
Ownership		0.37%		0.37%
Acquisition Cost		₩ 6		₩ 6
Book value		6		6
Fair value		₩ 6		₩ 6
Shinheung petrol. Co. Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		699		699
Ownership		0.14%		0.14%
Acquisition Cost		₩ 35		₩ 35
Book value		35		35
Fair value		₩ 35		₩ 35
Force TEC Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		3,501		3,501
Ownership		0.02%		0.02%
Acquisition Cost		₩ 18		₩ 18
Book value		18		18
Fair value		₩ 18		₩ 18
Samsung Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		486		486
Ownership		1.28%		1.28%
Acquisition Cost		₩ 97		₩ 97
Book value		36		36
Fair value		₩ 36		₩ 36
Tae Hyung Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		28		28
Ownership		0.43%		0.43%
Acquisition Cost		₩ 20		₩ 20
Book value		20		20
Fair value		₩ 20		₩ 20
Samyangplant Co, Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares				323
Ownership				0.60%
Acquisition Cost				₩ 16
Book value				16
Fair value				₩ 16
Younil Metal Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		41		41
Ownership		0.21%		0.21%
Acquisition Cost		₩ 21		₩ 21
Book value		21		21
Fair value		₩ 21		₩ 21
Myungjin Tech Co, Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares				20
Ownership				0.54%
Acquisition Cost				₩ 4
Book value				4
Fair value				₩ 4
Hankook Precision Ind Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		110		110
Ownership		0.06%		0.06%
Acquisition Cost		₩ 11		₩ 11
Book value		3		11
Fair value		₩ 3		₩ 11
Borneo International Furniture Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		4,000		4,000	[4]
Ownership		0.16%		0.16%	[4]
Acquisition Cost		₩ 97		₩ 97	[4]
Book value		13		13	[4]
Fair value		₩ 13		₩ 13	[4]
CJ Paradise Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		24		24
Ownership		0.02%		0.02%
Acquisition Cost		₩ 12		₩ 12
Book value		12		12
Fair value		₩ 12		₩ 12
Han Young Technology Company Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		35		35
Ownership		0.00%		0.00%
Acquisition Cost		₩ 0		₩ 0
Book value		0		0
Fair value		₩ 0		₩ 0
STX Offshore & Shipbuilding Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares		8,622		8,622
Ownership		0.25%		0.25%
Acquisition Cost		₩ 1,078		₩ 1,078
Book value		1,078		1,078
Fair value		₩ 1,078		₩ 1,078
Ptotronics Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		843		843
Ownership		0.42%		0.42%
Acquisition Cost		₩ 84		₩ 84
Book value		6		6
Fair value		₩ 6		₩ 6
NFT Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		136		136
Ownership		0.40%		0.40%
Acquisition Cost		₩ 8		₩ 8
Book value		8		8
Fair value		₩ 8		₩ 8
Echoroba Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		157		157
Ownership		0.02%		0.02%
Acquisition Cost		₩ 3		₩ 3
Book value		3		3
Fair value		₩ 3		₩ 3
Hyundaitech Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,363		1,363
Ownership		0.87%		0.87%
Acquisition Cost		₩ 27		₩ 27
Book value		27		27
Fair value		₩ 27		₩ 27
Dasan Material Co.Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		29		29
Ownership		0.04%		0.04%
Acquisition Cost		₩ 22		₩ 22
Book value		22		22
Fair value		₩ 22		₩ 22
Fish World Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		47		47
Ownership		0.21%		0.21%
Acquisition Cost		₩ 2		₩ 2
Book value		2		2
Fair value		₩ 2		₩ 2
SG Shinsung Engineering and Construction Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		10		10
Ownership		0.00%		0.00%
Acquisition Cost		₩ 6		₩ 6
Book value		6		6
Fair value		₩ 6		₩ 6
Samdo Industry Electric Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		48		48
Ownership		0.02%		0.02%
Acquisition Cost		₩ 1		₩ 1
Book value		1		1
Fair value		₩ 1		₩ 1
Taejung Industries Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		9,268		9,268
Ownership		0.30%		0.30%
Acquisition Cost		₩ 5		₩ 5
Book value		5		5
Fair value		₩ 5		₩ 5
Shinsei Trading Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		64		64
Ownership		0.72%		0.72%
Acquisition Cost		₩ 6		₩ 6
Book value		6		6
Fair value		₩ 6		₩ 6
Dynamic Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		111		111
Ownership		0.19%		0.19%
Acquisition Cost		₩ 3		₩ 3
Book value		3		3
Fair value		₩ 3		₩ 3
Green Alchemy Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		38,202		38,202
Ownership		1.48%		1.48%
Acquisition Cost		₩ 191		₩ 191
Book value		17		17
Fair value		₩ 17		₩ 17
Youone TBM Engineering & Construction Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		615		615
Ownership		0.27%		0.27%
Acquisition Cost		₩ 31		₩ 31
Book value		31		31
Fair value		₩ 31		₩ 31
KM Leatech
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,648		1,648
Ownership		0.98%		0.98%
Acquisition Cost		₩ 8		₩ 8
Book value		8		8
Fair value		₩ 8		₩ 8
Wonil T&I Co, Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares				229
Ownership				0.17%
Acquisition Cost				₩ 23
Book value				23
Fair value				₩ 23
Semist Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		555		555
Ownership		0.80%		0.80%
Acquisition Cost		₩ 3		₩ 3
Book value		3		3
Fair value		₩ 3		₩ 3
DS POWER Co, Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares				580,000
Ownership				2.34%
Acquisition Cost				₩ 2,900
Book value				916
Fair value				₩ 916
Sewon Bus Co.,Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares		12		12
Ownership		0.00%		0.00%
Acquisition Cost		₩ 0		₩ 0
Book value		0		0
Fair value		₩ 0		₩ 0
Enertec Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		7,937		7,937
Ownership		0.19%		0.19%
Acquisition Cost		₩ 44		₩ 44
Book value		44		44
Fair value		₩ 44		₩ 44
Sangji Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		20		20
Ownership		0.26%		0.26%
Acquisition Cost		₩ 4		₩ 4
Book value		4		4
Fair value		₩ 4		₩ 4
Bellie Doughnuts Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		64		64
Ownership		0.07%		0.07%
Acquisition Cost		₩ 4		₩ 4
Book value		4		4
Fair value		₩ 4		₩ 4
Possbell Engineering Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		36		36
Ownership		0.64%		0.64%
Acquisition Cost		₩ 1		₩ 1
Book value		1		1
Fair value		₩ 1		₩ 1
AIRTECH Information communication Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares		2,379		2,379
Ownership		0.60%		0.60%
Acquisition Cost		₩ 12		₩ 12
Book value		12		12
Fair value		₩ 12		₩ 12
CST co,ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares				4,998
Ownership				0.28%
Acquisition Cost				₩ 100
Book value				100
Fair value				₩ 100
TN Inc
Financial assets at fair value through other comprehensive income [Line Items]
Shares				1,416
Ownership				2.00%
Acquisition Cost				₩ 71
Book value				71
Fair value				₩ 71
Shin kwang Industrial Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		884		884
Ownership		0.35%		0.35%
Acquisition Cost		₩ 55		₩ 55
Book value		55		55
Fair value		₩ 55		₩ 55
Kiscom Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,493		1,493
Ownership		0.04%		0.04%
Acquisition Cost		₩ 1		₩ 1
Book value		1		1
Fair value		₩ 1		₩ 1
Seil Electronics Co,Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares				2,285
Ownership				0.41%
Acquisition Cost				₩ 286
Book value				286
Fair value				₩ 286
Wonil laser Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares		157		157
Ownership		0.37%		0.37%
Acquisition Cost		₩ 16		₩ 16
Book value		16		16
Fair value		₩ 16		₩ 16
Pyung Hwa Industrial Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		3,388		3,388
Ownership		3.00%		3.00%
Acquisition Cost		₩ 85		₩ 85
Book value		85		85
Fair value		₩ 85		₩ 85
Navanakorn Electric Co, Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[5]			4,442,800
Ownership	[5]			26.93%
Acquisition Cost	[5]			₩ 17,216
Book value	[5]			17,126
Fair value	[5]			₩ 17,126
PT. Kedap Sayaaq
Financial assets at fair value through other comprehensive income [Line Items]
Shares		671		671
Ownership		10.00%		10.00%
Acquisition Cost		₩ 18,540		₩ 18,540
Book value		0		0
Fair value		₩ 0		₩ 0
Set Holding
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,100,220	[6]	1,100,220	[7]
Ownership		2.50%	[6]	2.50%	[7]
Acquisition Cost		₩ 229,255	[6]	₩ 229,255	[7]
Book value		166,863	[6]	161,983	[7]
Fair value		₩ 166,863	[6]	₩ 161,983	[7]
PT. Cirebon Energi Prasarana
Financial assets at fair value through other comprehensive income [Line Items]
Shares		22,420		22,420
Ownership		10.00%		10.00%
Acquisition Cost		₩ 2,612		₩ 2,612
Book value		2,596		2,507
Fair value		₩ 2,596		₩ 2,507
KODE NOVUS I LLC
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[8]			0
Ownership	[8]			10.00%
Acquisition Cost	[8]			₩ 0
Book value	[8]			0
Fair value	[8]			₩ 0
Choheung packing Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		61		61
Ownership		0.13%		0.13%
Acquisition Cost		₩ 12		₩ 12
Book value		12		12
Fair value		₩ 12		₩ 12
Jaewoo Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		359		359
Ownership		0.24%		0.24%
Acquisition Cost		₩ 11		₩ 11
Book value		11		11
Fair value		₩ 11		₩ 11
Wooyang HC Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,375		1,375	[9]
Ownership		0.01%		0.01%	[9]
Acquisition Cost		₩ 159		₩ 159	[9]
Book value		159		159	[9]
Fair value		₩ 159		₩ 159	[9]
Sungsan Parts Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		629		629
Ownership		0.80%		0.80%
Acquisition Cost		₩ 63		₩ 63
Book value		63		63
Fair value		₩ 63		₩ 63
KMT Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,411		1,411
Ownership		0.93%		0.93%
Acquisition Cost		₩ 21		₩ 21
Book value		21		21
Fair value		₩ 21		₩ 21
TheYeonriji Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		116		116
Ownership		0.10%		0.10%
Acquisition Cost		₩ 6		₩ 6
Book value		6		6
Fair value		₩ 6		₩ 6
Flusys Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		9		9
Ownership		0.08%		0.08%
Acquisition Cost		₩ 2		₩ 2
Book value		2		2
Fair value		₩ 2		₩ 2
DaeSung Frontier Co, Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares				2,203
Ownership				1.11%
Acquisition Cost				₩ 221
Book value				221
Fair value				₩ 221
DongSeo Electronics Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		323		323
Ownership		0.07%		0.07%
Acquisition Cost		₩ 16		₩ 16
Book value		16		16
Fair value		₩ 16		₩ 16
Daewoo Display Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		177		177
Ownership		0.03%		0.03%
Acquisition Cost		₩ 5		₩ 5
Book value		5		5
Fair value		₩ 5		₩ 5
Yeong-gwang Remicon Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		15		15
Ownership		0.12%		0.12%
Acquisition Cost		₩ 2		₩ 2
Book value		2		2
Fair value		₩ 2		₩ 2
NTS Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		143		143
Ownership		0.22%		0.22%
Acquisition Cost		₩ 36		₩ 36
Book value		36		36
Fair value		₩ 36		₩ 36
AID CO.,LTD.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,212		1,212
Ownership		0.57%		0.57%
Acquisition Cost		₩ 36		₩ 36
Book value		36		36
Fair value		₩ 36		₩ 36
Changwon Eco-friendly farming corporation
Financial assets at fair value through other comprehensive income [Line Items]
Shares		3		3
Ownership		0.01%		0.01%
Acquisition Cost		₩ 0		₩ 0
Book value		0		0
Fair value		₩ 0		₩ 0
Kumo Hitech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		6,697		6,697
Ownership		0.53%		0.53%
Acquisition Cost		₩ 100		₩ 100
Book value		100		100
Fair value		₩ 100		₩ 100
Kyung Pyo Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		186		186
Ownership		0.76%		0.76%
Acquisition Cost		₩ 19		₩ 19
Book value		19		19
Fair value		₩ 19		₩ 19
Daedong Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		617		617
Ownership		0.55%		0.55%
Acquisition Cost		₩ 46		₩ 46
Book value		46		46
Fair value		₩ 46		₩ 46
Doosung Heavy Industries Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		53		53
Ownership		0.06%		0.06%
Acquisition Cost		₩ 5		₩ 5
Book value		5		5
Fair value		₩ 5		₩ 5
Jangback Testiles Co, Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares				494
Ownership				5.05%
Acquisition Cost				₩ 49
Book value				49
Fair value				₩ 49
Samjoo Hightech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		522		522
Ownership		0.08%		0.08%
Acquisition Cost		₩ 3		₩ 3
Book value		3		3
Fair value		₩ 3		₩ 3
Samkwang Chemical Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		204		204
Ownership		1.27%		1.27%
Acquisition Cost		₩ 51		₩ 51
Book value		51		51
Fair value		₩ 51		₩ 51
Taekwang Industry Co, Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares				1,327
Ownership				0.48%
Acquisition Cost				₩ 93
Book value				93
Fair value				₩ 93
Taekwang Precision Co, Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares				54
Ownership				0.47%
Acquisition Cost				₩ 54
Book value				54
Fair value				₩ 54
SG Corp.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		213		213
Ownership		0.54%		0.54%
Acquisition Cost		₩ 21		₩ 21
Book value		21		21
Fair value		₩ 21		₩ 21
Shinseung Chemical Industy Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		5		5
Ownership		0.01%		0.01%
Acquisition Cost		₩ 60		₩ 60
Book value		60		60
Fair value		₩ 60		₩ 60
KJ Alloy Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		368		368
Ownership		0.20%		0.20%
Acquisition Cost		₩ 7		₩ 7
Book value		7		7
Fair value		₩ 7		₩ 7
SM Hi-tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		22		22
Ownership		0.39%		0.39%
Acquisition Cost		₩ 22		₩ 22
Book value		22		22
Fair value		₩ 22		₩ 22
Keum Mun Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,320		1,320
Ownership		0.97%		0.97%
Acquisition Cost		₩ 330		₩ 330
Book value		56		330
Fair value		₩ 56		₩ 330
Puruen Environment Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		967		967
Ownership		1.34%		1.34%
Acquisition Cost		₩ 19		₩ 19
Book value		19		19
Fair value		₩ 19		₩ 19
Miretech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		9,111		9,111
Ownership		0.27%		0.27%
Acquisition Cost		₩ 18		₩ 18
Book value		18		18
Fair value		₩ 18		₩ 18
SIE Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		12		12
Ownership		0.02%		0.02%
Acquisition Cost		₩ 1		₩ 1
Book value		1		1
Fair value		₩ 1		₩ 1
Soongwon Ind Co, Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares				150
Ownership				0.40%
Acquisition Cost				₩ 53
Book value				53
Fair value				₩ 53
Sejin Hightech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		17,980		17,980
Ownership		0.16%		0.16%
Acquisition Cost		₩ 18		₩ 18
Book value		18		18
Fair value		₩ 18		₩ 18
Namcheong Corp.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		7,096		7,096
Ownership		0.28%		0.28%
Acquisition Cost		₩ 284		₩ 284
Book value		11		284
Fair value		₩ 11		₩ 284
Eun Sung Enterprise Co.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,131		1,131
Ownership		0.72%		0.72%
Acquisition Cost		₩ 17		₩ 17
Book value		17		17
Fair value		₩ 17		₩ 17
Dongdo Basalt Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		182		182
Ownership		1.50%		1.50%
Acquisition Cost		₩ 73		₩ 73
Book value		73		73
Fair value		₩ 73		₩ 73
Shinyoung Textiles Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		523		523
Ownership		1.01%		1.01%
Acquisition Cost		₩ 52		₩ 52
Book value		23		52
Fair value		₩ 23		₩ 52
Bugook Cast Iron Co.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		135		135
Ownership		0.71%		0.71%
Acquisition Cost		₩ 14		₩ 14
Book value		14		14
Fair value		₩ 14		₩ 14
Ilwoo Steel Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		41		41
Ownership		0.28%		0.28%
Acquisition Cost		₩ 17		₩ 17
Book value		17		17
Fair value		₩ 17		₩ 17
Dong-un Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,159		1,159
Ownership		6.28%		6.28%
Acquisition Cost		₩ 81		₩ 81
Book value		81		81
Fair value		₩ 81		₩ 81
Wongwang Door Corp.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		575		575
Ownership		1.00%		1.00%
Acquisition Cost		₩ 29		₩ 29
Book value		29		29
Fair value		₩ 29		₩ 29
Seobu Highway Solar Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		19,460
Ownership		10.00%
Acquisition Cost		₩ 192
Book value		192
Fair value		₩ 192
Dongbu Highway Solar Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		19,020
Ownership		4.99%
Acquisition Cost		₩ 192
Book value		192
Fair value		₩ 192
Muan sunshine solar power plant
Financial assets at fair value through other comprehensive income [Line Items]
Shares		298,300
Ownership		19.00%
Acquisition Cost		₩ 1,492
Book value		1,492
Fair value		₩ 1,492
mansu Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		344
Ownership		0.25%
Acquisition Cost		₩ 15
Book value		15
Fair value		₩ 15
Eanskorea Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		39
Ownership		0.05%
Acquisition Cost		₩ 2
Book value		2
Fair value		₩ 2
Youngdongseafood Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		165
Ownership		33.00%
Acquisition Cost		₩ 8
Book value		8
Fair value		₩ 8
Hyunwoo Winstar Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1
Ownership		0.00%
Acquisition Cost		₩ 0
Book value		0
Fair value		₩ 0
Sehwa Diecasting Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		299
Ownership		1.66%
Acquisition Cost		₩ 44
Book value		44
Fair value		₩ 44
Sungchang Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		159
Ownership		0.31%
Acquisition Cost		₩ 10
Book value		10
Fair value		₩ 10
Yuchang Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		90
Ownership		0.11%
Acquisition Cost		₩ 5
Book value		5
Fair value		₩ 5
Jeongpum Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		322
Ownership		0.35%
Acquisition Cost		₩ 16
Book value		16
Fair value		₩ 16
Korea Steel Power Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		2,761
Ownership		1.88%
Acquisition Cost		₩ 55
Book value		55
Fair value		₩ 55
DMC Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		5,831
Ownership		0.02%
Acquisition Cost		₩ 38
Book value		38
Fair value		₩ 38
Amanex Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		10
Ownership		0.02%
Acquisition Cost		₩ 9
Book value		9
Fair value		₩ 9
Dae-A Leisure Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		23
Ownership		0.00%
Acquisition Cost		₩ 4
Book value		4
Fair value		₩ 4
Caffe Bene Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,908
Ownership		0.03%
Acquisition Cost		₩ 2
Book value		2
Fair value		₩ 2
Daechang HRSG Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		618
Ownership		0.12%
Acquisition Cost		₩ 62
Book value		62
Fair value		₩ 62
Shinjin International Corp.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		4
Ownership		0.01%
Acquisition Cost		₩ 1
Book value		1
Fair value		₩ 1
Daewoon Shell Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		666
Ownership		2.81%
Acquisition Cost		₩ 33
Book value		33
Fair value		₩ 33
Jinhung Packaging Co.,Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares		4,329
Ownership		3.02%
Acquisition Cost		₩ 9
Book value		22
Fair value		₩ 22
Donglim Eng Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		26
Ownership		0.11%
Acquisition Cost		₩ 3
Book value		3
Fair value		₩ 3
SIP Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		274
Ownership		0.55%
Acquisition Cost		₩ 7
Book value		7
Fair value		₩ 7
Clizen Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		615
Ownership		0.34%
Acquisition Cost		₩ 31
Book value		31
Fair value		₩ 31
DAEDONGMILLENNIUM Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		159
Ownership		0.42%
Acquisition Cost		₩ 32
Book value		32
Fair value		₩ 32
Daeji Product Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		15
Ownership		0.05%
Acquisition Cost		₩ 1
Book value		0
Fair value		₩ 0
Cheong Hae Myeong Ga Co.,Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,867
Ownership		0.11%
Acquisition Cost		₩ 5
Book value		5
Fair value		₩ 5
Shinhan Sangi Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		29
Ownership		0.20%
Acquisition Cost		₩ 4
Book value		4
Fair value		₩ 4
Jaein Circuit Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		498
Ownership		1.12%
Acquisition Cost		₩ 65
Book value		65
Fair value		₩ 65
SSET Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		181
Ownership		0.30%
Acquisition Cost		₩ 18
Book value		18
Fair value		₩ 18
Sewon PM Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		963
Ownership		1.11%
Acquisition Cost		₩ 48
Book value		48
Fair value		₩ 48
Dawon Yuhwa Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		506
Ownership		1.94%
Acquisition Cost		₩ 25
Book value		25
Fair value		₩ 25
Ogokbaekkwa Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		101
Ownership		0.12%
Acquisition Cost		₩ 1
Book value		1
Fair value		₩ 1
Shinwonn Toptech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		834
Ownership		0.51%
Acquisition Cost		₩ 83
Book value		83
Fair value		₩ 83
KMLC Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		281
Ownership		0.14%
Acquisition Cost		₩ 22
Book value		22
Fair value		₩ 22
Seinfood Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		13
Ownership		0.17%
Acquisition Cost		₩ 7
Book value		7
Fair value		₩ 7
TaeSung Eco-Tech. Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,368
Ownership		4.55%
Acquisition Cost		₩ 34
Book value		34
Fair value		₩ 34
Kukex Inc.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		639
Ownership		0.05%
Acquisition Cost		₩ 3
Book value		3
Fair value		₩ 3
Youngshin Plu Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		104
Ownership		0.12%
Acquisition Cost		₩ 5
Book value		5
Fair value		₩ 5
Chang won Engineering Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		22
Ownership		0.00%
Acquisition Cost		₩ 4
Book value		4
Fair value		₩ 4
Samsung Silup Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		47
Ownership		0.19%
Acquisition Cost		₩ 5
Book value		5
Fair value		₩ 5
Samwon Bio Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		390
Ownership		0.25%
Acquisition Cost		₩ 6
Book value		6
Fair value		₩ 6
IZU KOREA Co. Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		48
Ownership		0.00%
Acquisition Cost		₩ 2
Book value		2
Fair value		₩ 2
Dongdo CNP Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		234
Ownership		0.36%
Acquisition Cost		₩ 6
Book value		6
Fair value		₩ 6
Hando Precision Co.,Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares		38
Ownership		0.26%
Acquisition Cost		₩ 4
Book value		4
Fair value		₩ 4
Dae Bang Industry Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		115
Ownership		0.13%
Acquisition Cost		₩ 6
Book value		6
Fair value		₩ 6
S.I.T. Co.,Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares		2,213
Ownership		0.44%
Acquisition Cost		₩ 22
Book value		22
Fair value		₩ 22
Taejin Hiech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		78
Ownership		0.26%
Acquisition Cost		₩ 3
Book value		3
Fair value		₩ 3
Headone Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		69
Ownership		0.12%
Acquisition Cost		₩ 7
Book value		7
Fair value		₩ 7
Enaindustry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		201
Ownership		0.09%
Acquisition Cost		₩ 141
Book value		141
Fair value		₩ 141
TCT Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		3,277
Ownership		0.55%
Acquisition Cost		₩ 82
Book value		82
Fair value		₩ 82
E-Won Solutech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		158
Ownership		0.16%
Acquisition Cost		₩ 40
Book value		40
Fair value		₩ 40
MJT Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,013
Ownership		0.20%
Acquisition Cost		₩ 51
Book value		51
Fair value		₩ 51
KPL Circuit Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		283
Ownership		0.08%
Acquisition Cost		₩ 14
Book value		14
Fair value		₩ 14
Road Solar Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		12
Ownership		0.00%
Acquisition Cost		₩ 0
Book value		0
Fair value		₩ 0
Sung Ae Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		190
Ownership		0.80%
Acquisition Cost		₩ 10
Book value		10
Fair value		₩ 10
Han Mi Flexible Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		143
Ownership		0.20%
Acquisition Cost		₩ 43
Book value		43
Fair value		₩ 43
Samhwa Casting Co. Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		200
Ownership		0.00%
Acquisition Cost		₩ 100
Book value		100
Fair value		₩ 100
Millennium PNT Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		227
Ownership		0.37%
Acquisition Cost		₩ 6
Book value		6
Fair value		₩ 6
GN Chem Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		40
Ownership		0.07%
Acquisition Cost		₩ 1
Book value		1
Fair value		₩ 1
GW Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		505
Ownership		0.07%
Acquisition Cost		₩ 51
Book value		51
Fair value		₩ 51
TM Construction co. Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares		4
Ownership		0.00%
Acquisition Cost		₩ 0
Book value		0
Fair value		₩ 0
Dae Myung Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares		114
Ownership		0.08%
Acquisition Cost		₩ 3
Book value		3
Fair value		₩ 3
Nanomicart Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		176
Ownership		1.06%
Acquisition Cost		₩ 35
Book value		35
Fair value		₩ 35
Young San Heavy Industries Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		74
Ownership		0.11%
Acquisition Cost		₩ 7
Book value		7
Fair value		₩ 7
Samchungwon Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		15
Ownership		0.24%
Acquisition Cost		₩ 2
Book value		2
Fair value		₩ 2
Wooyang Frozen Foods Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		66
Ownership		0.82%
Acquisition Cost		₩ 27
Book value		27
Fair value		₩ 27
Nanomic Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		94
Ownership		0.63%
Acquisition Cost		₩ 38
Book value		38
Fair value		₩ 38
Dong Hwan Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		25
Ownership		0.02%
Acquisition Cost		₩ 1
Book value		1
Fair value		₩ 1
[1]	The number of shares owned has changed due to the stock merge (4:1) during the year ended December 31, 2018.
[2]	The Company used initial cost as their fair value because there was not enough information to determine fair value, and the range of the estimated fair value is wide.
[3]	The number of shares owned has changed due to the stock merge (5:1) during the year ended December 31, 2018.
[4]	The number of shares owned has changed due to capital reduction without refund (3:1), consolidation of stocks (10,000:1), and split of stock (1:2,000) during the year ended December 31, 2018
[5]	Although the Company holds more than 20% of the equity shares of these investments, the Company is unable to exercise significant influence.
[6]	The Company has estimated the fair value of Set Holding by using the discounted cash flow method and has recognized the difference between its fair value and book value as gain or loss on valuation of financial assets at FVOCI in other comprehensive income or loss for the year ended December 31, 2019.
[7]	The Company has estimated the fair value of Set Holding by using the discounted cash flow method and has recognized the difference between its fair value and book value as gain or loss on valuation of available-for-sale financial assets in other comprehensive income or loss during the year ended December 31, 2018.
[8]	As described in note 20, this is reclassified to financial assets at fair value through other comprehensive income due to loss of significant influence of the Company.
[9]	The number of shares owned has changed due to the stock merge (10:1) during the year ended December 31, 2018.

Financial Assets at Amortized_3

Financial Assets at Amortized Cost (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2019	Dec. 31, 2018
Financial Assets at Amortized Cost [Line Items]
Current financial assets at amortized costs	₩ 12,302	₩ 11,956
Non-current financial assets at amortized costs	1,307	2,086
Financial assets at amortized costs	13,609	14,042
Gross carrying amount [Member]
Financial Assets at Amortized Cost [Line Items]
Current financial assets at amortized costs	12,302	11,956
Non-current financial assets at amortized costs	1,307	2,086
Financial assets at amortized costs	13,609	14,042
Government grants
Financial Assets at Amortized Cost [Line Items]
Current financial assets at amortized costs	0	0
Non-current financial assets at amortized costs	0	0
Financial assets at amortized costs	0	0
Allowance for doubtful accounts
Financial Assets at Amortized Cost [Line Items]
Current financial assets at amortized costs	0	0
Non-current financial assets at amortized costs	0	0
Financial assets at amortized costs	0	0
Government bonds
Financial Assets at Amortized Cost [Line Items]
Financial assets at amortized costs	1,609	3,042
Government bonds | Gross carrying amount [Member]
Financial Assets at Amortized Cost [Line Items]
Financial assets at amortized costs	1,609	3,042
Government bonds | Government grants
Financial Assets at Amortized Cost [Line Items]
Financial assets at amortized costs	0	0
Government bonds | Allowance for doubtful accounts
Financial Assets at Amortized Cost [Line Items]
Financial assets at amortized costs	0	0
Others
Financial Assets at Amortized Cost [Line Items]
Financial assets at amortized costs	12,000	11,000
Others | Gross carrying amount [Member]
Financial Assets at Amortized Cost [Line Items]
Financial assets at amortized costs	12,000	11,000
Others | Government grants
Financial Assets at Amortized Cost [Line Items]
Financial assets at amortized costs	0	0
Others | Allowance for doubtful accounts
Financial Assets at Amortized Cost [Line Items]
Financial assets at amortized costs	₩ 0	₩ 0

Derivative Instrument (Details)

Derivative Instrument (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Derivative [Line Items]
Current derivative financial assets		₩ 27,618		₩ 42,107		₩ 12,935
Non-current derivative financial assets		283,415		60,228		19,691
Current derivative financial liabilities		73,064		20,431		71,267
Non-current derivative financial liabilities		96,896		291,732		356,792
Disclosure of Gain and loss on valuation and transaction of derivatives and included in finance income and costs in the consolidated statements of comprehensive income (loss)
Net income effects of valuation gain (loss)		317,350		153,203		(874,667)
Net income effects of transaction gain (loss)		86,415		147,297		(168,961)
Accumulated other comprehensive income (loss)	[1]	35,727		(6,429)		31,884
Currency forward
Derivative [Line Items]
Current derivative financial assets		21		2,128		45
Non-current derivative financial assets		43,931		12,606		0
Current derivative financial liabilities		7,081		1,956		7,862
Non-current derivative financial liabilities		0		0		1,278
Disclosure of Gain and loss on valuation and transaction of derivatives and included in finance income and costs in the consolidated statements of comprehensive income (loss)
Net income effects of valuation gain (loss)		24,265		12,632		(41,889)
Net income effects of transaction gain (loss)		12,488		23,991		(28,223)
Accumulated other comprehensive income (loss)	[1]	0		0		0
Currency swap
Derivative [Line Items]
Current derivative financial assets		27,597		39,979		12
Non-current derivative financial assets		229,258		43,436		15,711
Current derivative financial liabilities		59,327		14,881		61,997
Non-current derivative financial liabilities		45,184		233,690		296,098
Disclosure of Gain and loss on valuation and transaction of derivatives and included in finance income and costs in the consolidated statements of comprehensive income (loss)
Net income effects of valuation gain (loss)		310,732		145,088		(843,747)
Net income effects of transaction gain (loss)		110,813		123,670		(137,376)
Accumulated other comprehensive income (loss)	[1]	38,802		(12,516)		26,810
Interest rate swap
Derivative [Line Items]
Current derivative financial assets		0		0		0
Non-current derivative financial assets		7,592		2,342		2,697
Current derivative financial liabilities		451		1,439		1,408
Non-current derivative financial liabilities		50,756		58,042		59,416
Disclosure of Gain and loss on valuation and transaction of derivatives and included in finance income and costs in the consolidated statements of comprehensive income (loss)
Net income effects of valuation gain (loss)		(16,231)		(2,949)		6,909
Net income effects of transaction gain (loss)		(36,886)		(364)		(3,362)
Accumulated other comprehensive income (loss)	[1]	(3,075)		6,087		5,074
Others
Derivative [Line Items]
Current derivative financial assets		0	[2]	0	[2]	12,878
Non-current derivative financial assets		2,634	[2]	1,844	[2]	1,283
Current derivative financial liabilities		6,205	[3],[4]	2,155	[3],[4]	0
Non-current derivative financial liabilities		956	[3],[4]	0	[3],[4]	0
Disclosure of Gain and loss on valuation and transaction of derivatives and included in finance income and costs in the consolidated statements of comprehensive income (loss)
Net income effects of valuation gain (loss)		(1,416)		(1,568)		4,060
Net income effects of transaction gain (loss)		0		0		0
Accumulated other comprehensive income (loss)	[1]	₩ 0		₩ 0		₩ 0
[1]	For the year ended December 31, 2019, the net gain on valuation of derivatives designated as cash flow hedge of W19,242 million, net of tax, is included in other comprehensive income or loss.
[2]	The Company had a put option to sell shares of DS POWER Co., Ltd. and the fair value of the option is recorded in 'Others' in the prior year. The Company sold their shares during the year ended December 31, 2019. As described in Note 16, the Company has a right to purchase the shares of KOSPO Youngnam Power Co., Ltd., a subsidiary of the Company, and the amount is the fair value of the stock option.
[3]	The Company has an obligation to settle the convertible preferred stock to financial investors pursuant to the settlement contract with Samcheok Eco Materials Co., Ltd. and the fair value of the obligation is recorded in 'Others'
[4]	The Company has granted stock option to Chester Solar IV SpA, a joint venture of the Company, and 4 other third party investors, and recognized its fair value as other derivative liabilities.

Derivative Currency swap forwar

Derivative Currency swap forward contract List (Details) - 12 months ended Dec. 31, 2019 - Currency forward contracts € in Thousands, $ in Thousands, ₩ in Millions	KRW (₩)	USD ($)	EUR (€)
Disclosure of Derivative Currency forward contract detail list [Line Items]
Derivative Counterparty	Hana Bank	Hana Bank	Hana Bank
Contract date	Apr. 10, 2014	Apr. 10, 2014	Apr. 10, 2014
Matrurity date	Jul. 12, 2021	Jul. 12, 2021	Jul. 12, 2021
Contract Amount Pay	₩ 55,120
Contract Amount Receive | $		$ 52,000
Contract exchange rate	1,060	1,060	1,060
Derivative Counterparty	Hana Bank	Hana Bank	Hana Bank
Contract date	Apr. 28, 2014	Apr. 28, 2014	Apr. 28, 2014
Matrurity date	Jul. 12, 2021	Jul. 12, 2021	Jul. 12, 2021
Contract Amount Pay	₩ 50,784
Contract Amount Receive | $		$ 48,000
Contract exchange rate	1,058	1,058	1,058
Derivative Counterparty	Bank of America	Bank of America	Bank of America
Contract date	Apr. 29, 2014	Apr. 29, 2014	Apr. 29, 2014
Matrurity date	Jul. 12, 2021	Jul. 12, 2021	Jul. 12, 2021
Contract Amount Pay	₩ 105,400
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,054	1,054	1,054
Derivative Counterparty	Hana Bank	Hana Bank	Hana Bank
Contract date	May 9, 2014	May 9, 2014	May 9, 2014
Matrurity date	Jul. 12, 2021	Jul. 12, 2021	Jul. 12, 2021
Contract Amount Pay	₩ 104,600
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,046	1,046	1,046
Derivative Counterparty	Hana Bank	Hana Bank	Hana Bank
Contract date	Dec. 22, 2017	Dec. 22, 2017	Dec. 22, 2017
Matrurity date	Jul. 12, 2021	Jul. 12, 2021	Jul. 12, 2021
Contract Amount Pay	₩ 105,079
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,050.79	1,050.79	1,050.79
Derivative Counterparty	Korea Development Bank	Korea Development Bank	Korea Development Bank
Contract date	Dec. 27, 2017	Dec. 27, 2017	Dec. 27, 2017
Matrurity date	Jul. 12, 2021	Jul. 12, 2021	Jul. 12, 2021
Contract Amount Pay	₩ 104,849
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,048.49	1,048.49	1,048.49
Derivative Counterparty	Citibank	Citibank	Citibank
Contract date	Dec. 30, 2019	Dec. 30, 2019	Dec. 30, 2019
Matrurity date	Jan. 23, 2020	Jan. 23, 2020	Jan. 23, 2020
Contract Amount Pay	₩ 12,943
Contract Amount Receive | $		$ 11,167
Contract exchange rate	1,159.1	1,159.1	1,159.1
Derivative Counterparty	Standard Chartered	Standard Chartered	Standard Chartered
Contract date	Dec. 17, 2019	Dec. 17, 2019	Dec. 17, 2019
Matrurity date	Jan. 2, 2020	Jan. 2, 2020	Jan. 2, 2020
Contract Amount Pay	₩ 73,871
Contract Amount Receive | €			€ 56,800
Contract exchange rate	1,300.57	1,300.57	1,300.57
Derivative Counterparty	Nonghyup Bank	Nonghyup Bank	Nonghyup Bank
Contract date	Dec. 2, 2019	Dec. 2, 2019	Dec. 2, 2019
Matrurity date	Jan. 3, 2020	Jan. 3, 2020	Jan. 3, 2020
Contract Amount Pay	₩ 9,436
Contract Amount Receive | $		$ 8,000
Contract exchange rate	1,179.55	1,179.55	1,179.55
Derivative Counterparty	Mizuho Bank	Mizuho Bank	Mizuho Bank
Contract date	Dec. 3, 2019	Dec. 3, 2019	Dec. 3, 2019
Matrurity date	Jan. 6, 2020	Jan. 6, 2020	Jan. 6, 2020
Contract Amount Pay	₩ 9,482
Contract Amount Receive | $		$ 8,000
Contract exchange rate	1,185.25	1,185.25	1,185.25
Derivative Counterparty	Hana Bank	Hana Bank	Hana Bank
Contract date	Dec. 4, 2019	Dec. 4, 2019	Dec. 4, 2019
Matrurity date	Jan. 7, 2020	Jan. 7, 2020	Jan. 7, 2020
Contract Amount Pay	₩ 8,350
Contract Amount Receive | $		$ 7,000
Contract exchange rate	1,192.82	1,192.82	1,192.82
Derivative Counterparty	Kookmin Bank	Kookmin Bank	Kookmin Bank
Contract date	Dec. 5, 2019	Dec. 5, 2019	Dec. 5, 2019
Matrurity date	Jan. 9, 2020	Jan. 9, 2020	Jan. 9, 2020
Contract Amount Pay	₩ 11,895
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,189.45	1,189.45	1,189.45
Derivative Counterparty	CCB	CCB	CCB
Contract date	Dec. 5, 2019	Dec. 5, 2019	Dec. 5, 2019
Matrurity date	Jan. 9, 2020	Jan. 9, 2020	Jan. 9, 2020
Contract Amount Pay	₩ 11,895
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,189.5	1,189.5	1,189.5
Derivative Counterparty	Standard Chartered	Standard Chartered	Standard Chartered
Contract date	Dec. 6, 2019	Dec. 6, 2019	Dec. 6, 2019
Matrurity date	Jan. 10, 2020	Jan. 10, 2020	Jan. 10, 2020
Contract Amount Pay	₩ 11,891
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,189.05	1,189.05	1,189.05
Derivative Counterparty	Credit Agricole	Credit Agricole	Credit Agricole
Contract date	Dec. 9, 2019	Dec. 9, 2019	Dec. 9, 2019
Matrurity date	Jan. 13, 2020	Jan. 13, 2020	Jan. 13, 2020
Contract Amount Pay	₩ 11,885
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,188.47	1,188.47	1,188.47
Derivative Counterparty	Hana Bank	Hana Bank	Hana Bank
Contract date	Dec. 10, 2019	Dec. 10, 2019	Dec. 10, 2019
Matrurity date	Jan. 14, 2020	Jan. 14, 2020	Jan. 14, 2020
Contract Amount Pay	₩ 11,912
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,191.23	1,191.23	1,191.23
Derivative Counterparty	Korea Development Bank	Korea Development Bank	Korea Development Bank
Contract date	Dec. 11, 2019	Dec. 11, 2019	Dec. 11, 2019
Matrurity date	Jan. 15, 2020	Jan. 15, 2020	Jan. 15, 2020
Contract Amount Pay	₩ 11,925
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,192.5	1,192.5	1,192.5
Derivative Counterparty	Nonghyup Bank	Nonghyup Bank	Nonghyup Bank
Contract date	Dec. 11, 2019	Dec. 11, 2019	Dec. 11, 2019
Matrurity date	Jan. 15, 2020	Jan. 15, 2020	Jan. 15, 2020
Contract Amount Pay	₩ 5,962
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,192.45	1,192.45	1,192.45
Derivative Counterparty	Mizuho Bank	Mizuho Bank	Mizuho Bank
Contract date	Dec. 11, 2019	Dec. 11, 2019	Dec. 11, 2019
Matrurity date	Jan. 15, 2020	Jan. 15, 2020	Jan. 15, 2020
Contract Amount Pay	₩ 5,963
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,192.5	1,192.5	1,192.5
Derivative Counterparty	CCB	CCB	CCB
Contract date	Dec. 12, 2019	Dec. 12, 2019	Dec. 12, 2019
Matrurity date	Jan. 16, 2020	Jan. 16, 2020	Jan. 16, 2020
Contract Amount Pay	₩ 7,118
Contract Amount Receive | $		$ 6,000
Contract exchange rate	1,186.35	1,186.35	1,186.35
Derivative Counterparty	Morgan Stanley	Morgan Stanley	Morgan Stanley
Contract date	Dec. 16, 2019	Dec. 16, 2019	Dec. 16, 2019
Matrurity date	Jan. 17, 2020	Jan. 17, 2020	Jan. 17, 2020
Contract Amount Pay	₩ 5,854
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,170.85	1,170.85	1,170.85
Derivative Counterparty	Woori Bank	Woori Bank	Woori Bank
Contract date	Dec. 19, 2019	Dec. 19, 2019	Dec. 19, 2019
Matrurity date	Jan. 22, 2020	Jan. 22, 2020	Jan. 22, 2020
Contract Amount Pay	₩ 11,636
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,163.55	1,163.55	1,163.55
Derivative Counterparty	Shinhan Bank	Shinhan Bank	Shinhan Bank
Contract date	Dec. 19, 2019	Dec. 19, 2019	Dec. 19, 2019
Matrurity date	Jan. 22, 2020	Jan. 22, 2020	Jan. 22, 2020
Contract Amount Pay	₩ 11,635
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,163.45	1,163.45	1,163.45
Derivative Counterparty	CCB	CCB	CCB
Contract date	Dec. 27, 2019	Dec. 27, 2019	Dec. 27, 2019
Matrurity date	Jan. 31, 2020	Jan. 31, 2020	Jan. 31, 2020
Contract Amount Pay	₩ 11,597
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,159.65	1,159.65	1,159.65
Derivative Counterparty	Kookmin Bank	Kookmin Bank	Kookmin Bank
Contract date	Dec. 30, 2019	Dec. 30, 2019	Dec. 30, 2019
Matrurity date	Feb. 3, 2020	Feb. 3, 2020	Feb. 3, 2020
Contract Amount Pay	₩ 5,786
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,157.2	1,157.2	1,157.2
Derivative Counterparty	Shinhan Bank	Shinhan Bank	Shinhan Bank
Contract date	Dec. 18, 2019	Dec. 18, 2019	Dec. 18, 2019
Matrurity date	Jan. 7, 2020	Jan. 7, 2020	Jan. 7, 2020
Contract Amount Pay	₩ 9,901
Contract Amount Receive | $		$ 8,500
Contract exchange rate	1,164.86	1,164.86	1,164.86
Derivative Counterparty	Hana Bank	Hana Bank	Hana Bank
Contract date	Dec. 13, 2019	Dec. 13, 2019	Dec. 13, 2019
Matrurity date	Jan. 7, 2020	Jan. 7, 2020	Jan. 7, 2020
Contract Amount Pay	₩ 4,678
Contract Amount Receive | $		$ 4,000
Contract exchange rate	1,169.45	1,169.45	1,169.45
Derivative Counterparty	Hana Bank	Hana Bank	Hana Bank
Contract date	Dec. 20, 2019	Dec. 20, 2019	Dec. 20, 2019
Matrurity date	Jan. 7, 2020	Jan. 7, 2020	Jan. 7, 2020
Contract Amount Pay	₩ 8,136
Contract Amount Receive | $		$ 7,000
Contract exchange rate	1,162.23	1,162.23	1,162.23
Derivative Counterparty	BNP Paribas	BNP Paribas	BNP Paribas
Contract date	Dec. 27, 2019	Dec. 27, 2019	Dec. 27, 2019
Matrurity date	Jan. 13, 2020	Jan. 13, 2020	Jan. 13, 2020
Contract Amount Pay	₩ 3,480
Contract Amount Receive | $		$ 3,000
Contract exchange rate	1,160.1	1,160.1	1,160.1
Derivative Counterparty	Societe Generale	Societe Generale	Societe Generale
Contract date	Dec. 27, 2019	Dec. 27, 2019	Dec. 27, 2019
Matrurity date	Jan. 13, 2020	Jan. 13, 2020	Jan. 13, 2020
Contract Amount Pay	₩ 8,701
Contract Amount Receive | $		$ 7,500
Contract exchange rate	1,160.1	1,160.1	1,160.1
Derivative Counterparty	Korea Development Bank	Korea Development Bank	Korea Development Bank
Contract date	Dec. 30, 2019	Dec. 30, 2019	Dec. 30, 2019
Matrurity date	Jan. 23, 2020	Jan. 23, 2020	Jan. 23, 2020
Contract Amount Pay	₩ 4,630
Contract Amount Receive | $		$ 4,000
Contract exchange rate	1,157.4	1,157.4	1,157.4
Derivative Counterparty	BNP Paribas	BNP Paribas	BNP Paribas
Contract date	Dec. 12, 2019	Dec. 12, 2019	Dec. 12, 2019
Matrurity date	Jan. 16, 2020	Jan. 16, 2020	Jan. 16, 2020
Contract Amount Pay	₩ 4,739
Contract Amount Receive | $		$ 4,000
Contract exchange rate	1,184.85	1,184.85	1,184.85
Derivative Counterparty	Mizuho Bank	Mizuho Bank	Mizuho Bank
Contract date	Dec. 12, 2019	Dec. 12, 2019	Dec. 12, 2019
Matrurity date	Jan. 16, 2020	Jan. 16, 2020	Jan. 16, 2020
Contract Amount Pay	₩ 3,558
Contract Amount Receive | $		$ 3,000
Contract exchange rate	1,186	1,186	1,186
Derivative Counterparty	MUFG	MUFG	MUFG
Contract date	Dec. 17, 2019	Dec. 17, 2019	Dec. 17, 2019
Matrurity date	Jan. 21, 2020	Jan. 21, 2020	Jan. 21, 2020
Contract Amount Pay	₩ 5,823
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,164.6	1,164.6	1,164.6
Derivative Counterparty	Nova Scotia	Nova Scotia	Nova Scotia
Contract date	Dec. 17, 2019	Dec. 17, 2019	Dec. 17, 2019
Matrurity date	Jan. 21, 2020	Jan. 21, 2020	Jan. 21, 2020
Contract Amount Pay	₩ 5,824
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,164.7	1,164.7	1,164.7
Derivative Counterparty	BNP Paribas	BNP Paribas	BNP Paribas
Contract date	Dec. 20, 2019	Dec. 20, 2019	Dec. 20, 2019
Matrurity date	Jan. 22, 2020	Jan. 22, 2020	Jan. 22, 2020
Contract Amount Pay	₩ 2,290
Contract Amount Receive | $		$ 1,975
Contract exchange rate	1,159.48	1,159.48	1,159.48
Derivative Counterparty	Nonghyup Bank	Nonghyup Bank	Nonghyup Bank
Contract date	Dec. 20, 2019	Dec. 20, 2019	Dec. 20, 2019
Matrurity date	Jan. 22, 2020	Jan. 22, 2020	Jan. 22, 2020
Contract Amount Pay	₩ 11,605
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,160.5	1,160.5	1,160.5
Derivative Counterparty	Nova Scotia	Nova Scotia	Nova Scotia
Contract date	Dec. 30, 2019	Dec. 30, 2019	Dec. 30, 2019
Matrurity date	Feb. 3, 2020	Feb. 3, 2020	Feb. 3, 2020
Contract Amount Pay	₩ 5,778
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,155.65	1,155.65	1,155.65
Derivative Counterparty	Mizuho Bank	Mizuho Bank	Mizuho Bank
Contract date	Dec. 30, 2019	Dec. 30, 2019	Dec. 30, 2019
Matrurity date	Feb. 3, 2020	Feb. 3, 2020	Feb. 3, 2020
Contract Amount Pay	₩ 5,777
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,155.3	1,155.3	1,155.3
Derivative Counterparty	HSBC	HSBC	HSBC
Contract date	Dec. 13, 2019	Dec. 13, 2019	Dec. 13, 2019
Matrurity date	Sep. 10, 2020	Sep. 10, 2020	Sep. 10, 2020
Contract Amount Pay	₩ 46,580
Contract Amount Receive | $		$ 40,000
Contract exchange rate	1,164.5	1,164.5	1,164.5
Derivative Counterparty	Nova Scotia	Nova Scotia	Nova Scotia
Contract date	Dec. 13, 2019	Dec. 13, 2019	Dec. 13, 2019
Matrurity date	Sep. 10, 2020	Sep. 10, 2020	Sep. 10, 2020
Contract Amount Pay	₩ 34,959
Contract Amount Receive | $		$ 30,000
Contract exchange rate	1,165.3	1,165.3	1,165.3
Derivative Counterparty	Nova Scotia	Nova Scotia	Nova Scotia
Contract date	Dec. 16, 2019	Dec. 16, 2019	Dec. 16, 2019
Matrurity date	Dec. 3, 2020	Dec. 3, 2020	Dec. 3, 2020
Contract Amount Pay	₩ 11,657
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,165.7	1,165.7	1,165.7
Derivative Counterparty	Nonghyup Bank	Nonghyup Bank	Nonghyup Bank
Contract date	Dec. 16, 2019	Dec. 16, 2019	Dec. 16, 2019
Matrurity date	Dec. 3, 2020	Dec. 3, 2020	Dec. 3, 2020
Contract Amount Pay	₩ 23,324
Contract Amount Receive | $		$ 20,000
Contract exchange rate	1,166.2	1,166.2	1,166.2
Derivative Counterparty	Mizuho Bank	Mizuho Bank	Mizuho Bank
Contract date	Dec. 17, 2019	Dec. 17, 2019	Dec. 17, 2019
Matrurity date	Jan. 10, 2020	Jan. 10, 2020	Jan. 10, 2020
Contract Amount Pay	₩ 10,537
Contract Amount Receive | $		$ 9,000
Contract exchange rate	1,170.8	1,170.8	1,170.8
Derivative Counterparty	Mizuho Bank	Mizuho Bank	Mizuho Bank
Contract date	Dec. 19, 2019	Dec. 19, 2019	Dec. 19, 2019
Matrurity date	Jan. 13, 2020	Jan. 13, 2020	Jan. 13, 2020
Contract Amount Pay	₩ 9,314
Contract Amount Receive | $		$ 8,000
Contract exchange rate	1,164.3	1,164.3	1,164.3
Derivative Counterparty	Mizuho Bank	Mizuho Bank	Mizuho Bank
Contract date	Dec. 24, 2019	Dec. 24, 2019	Dec. 24, 2019
Matrurity date	Jan. 4, 2020	Jan. 4, 2020	Jan. 4, 2020
Contract Amount Pay	₩ 5,228
Contract Amount Receive | $		$ 4,500
Contract exchange rate	1,161.85	1,161.85	1,161.85
Derivative Counterparty	HSBC	HSBC	HSBC
Contract date	Dec. 26, 2019	Dec. 26, 2019	Dec. 26, 2019
Matrurity date	Jan. 23, 2020	Jan. 23, 2020	Jan. 23, 2020
Contract Amount Pay	₩ 10,443
Contract Amount Receive | $		$ 9,000
Contract exchange rate	1,160.3	1,160.3	1,160.3
Derivative Counterparty	Mizuho Bank	Mizuho Bank	Mizuho Bank
Contract date	Dec. 30, 2019	Dec. 30, 2019	Dec. 30, 2019
Matrurity date	Jan. 23, 2020	Jan. 23, 2020	Jan. 23, 2020
Contract Amount Pay	₩ 4,624
Contract Amount Receive | $		$ 4,000
Contract exchange rate	1,155.9	1,155.9	1,155.9
Derivative Counterparty	Standard Chartered	Standard Chartered	Standard Chartered
Contract date	Dec. 3, 2019	Dec. 3, 2019	Dec. 3, 2019
Matrurity date	Jan. 6, 2020	Jan. 6, 2020	Jan. 6, 2020
Contract Amount Pay	₩ 315
Contract Amount Receive | $		$ 266
Contract exchange rate	1,186.05	1,186.05	1,186.05
Derivative Counterparty	Nova Scotia	Nova Scotia	Nova Scotia
Contract date	Dec. 6, 2019	Dec. 6, 2019	Dec. 6, 2019
Matrurity date	Jan. 10, 2020	Jan. 10, 2020	Jan. 10, 2020
Contract Amount Pay	₩ 4,393
Contract Amount Receive | $		$ 3,700
Contract exchange rate	1,187.35	1,187.35	1,187.35
Derivative Counterparty	Credit Agricole	Credit Agricole	Credit Agricole
Contract date	Dec. 6, 2019	Dec. 6, 2019	Dec. 6, 2019
Matrurity date	Jan. 10, 2020	Jan. 10, 2020	Jan. 10, 2020
Contract Amount Pay	₩ 4,761
Contract Amount Receive | $		$ 4,000
Contract exchange rate	1,190.35	1,190.35	1,190.35
Derivative Counterparty	Nova Scotia	Nova Scotia	Nova Scotia
Contract date	Dec. 10, 2019	Dec. 10, 2019	Dec. 10, 2019
Matrurity date	Jan. 13, 2020	Jan. 13, 2020	Jan. 13, 2020
Contract Amount Pay	₩ 1,491
Contract Amount Receive | $		$ 1,250
Contract exchange rate	1,192.70	1,192.70	1,192.70
Derivative Counterparty	Standard Chartered	Standard Chartered	Standard Chartered
Contract date	Dec. 12, 2019	Dec. 12, 2019	Dec. 12, 2019
Matrurity date	Jan. 16, 2020	Jan. 16, 2020	Jan. 16, 2020
Contract Amount Pay	₩ 8,303
Contract Amount Receive | $		$ 7,000
Contract exchange rate	1,186.10	1,186.10	1,186.10
Derivative Counterparty	Credit Agricole	Credit Agricole	Credit Agricole
Contract date	Dec. 12, 2019	Dec. 12, 2019	Dec. 12, 2019
Matrurity date	Jan. 16, 2020	Jan. 16, 2020	Jan. 16, 2020
Contract Amount Pay	₩ 5,930
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,185.95	1,185.95	1,185.95
Derivative Counterparty	Societe Generale	Societe Generale	Societe Generale
Contract date	Dec. 12, 2019	Dec. 12, 2019	Dec. 12, 2019
Matrurity date	Jan. 16, 2020	Jan. 16, 2020	Jan. 16, 2020
Contract Amount Pay	₩ 5,931
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,186.20	1,186.20	1,186.20
Derivative Counterparty	Nova Scotia	Nova Scotia	Nova Scotia
Contract date	Dec. 12, 2019	Dec. 12, 2019	Dec. 12, 2019
Matrurity date	Jan. 16, 2020	Jan. 16, 2020	Jan. 16, 2020
Contract Amount Pay	₩ 6,525
Contract Amount Receive | $		$ 5,500
Contract exchange rate	1,186.30	1,186.30	1,186.30
Derivative Counterparty	Standard Chartered	Standard Chartered	Standard Chartered
Contract date	Dec. 16, 2019	Dec. 16, 2019	Dec. 16, 2019
Matrurity date	Jan. 21, 2020	Jan. 21, 2020	Jan. 21, 2020
Contract Amount Pay	₩ 9,367
Contract Amount Receive | $		$ 8,000
Contract exchange rate	1,170.90	1,170.90	1,170.90
Derivative Counterparty	Nova Scotia	Nova Scotia	Nova Scotia
Contract date	Dec. 17, 2019	Dec. 17, 2019	Dec. 17, 2019
Matrurity date	Jan. 21, 2020	Jan. 21, 2020	Jan. 21, 2020
Contract Amount Pay	₩ 4,648
Contract Amount Receive | $		$ 4,000
Contract exchange rate	1,162	1,162	1,162
Derivative Counterparty	Hana Bank	Hana Bank	Hana Bank
Contract date	Dec. 19, 2019	Dec. 19, 2019	Dec. 19, 2019
Matrurity date	Jan. 23, 2020	Jan. 23, 2020	Jan. 23, 2020
Contract Amount Pay	₩ 6,055
Contract Amount Receive | $		$ 5,200
Contract exchange rate	1,164.40	1,164.40	1,164.40
Derivative Counterparty	Woori Bank	Woori Bank	Woori Bank
Contract date	Dec. 20, 2019	Dec. 20, 2019	Dec. 20, 2019
Matrurity date	Jan. 28, 2020	Jan. 28, 2020	Jan. 28, 2020
Contract Amount Pay	₩ 9,414
Contract Amount Receive | $		$ 8,100
Contract exchange rate	1,162.20	1,162.20	1,162.20
Derivative Counterparty	Shinhan Bank	Shinhan Bank	Shinhan Bank
Contract date	Dec. 20, 2019	Dec. 20, 2019	Dec. 20, 2019
Matrurity date	Jan. 28, 2020	Jan. 28, 2020	Jan. 28, 2020
Contract Amount Pay	₩ 4,939
Contract Amount Receive | $		$ 4,250
Contract exchange rate	1,162.15	1,162.15	1,162.15
Derivative Counterparty	Shinhan Bank	Shinhan Bank	Shinhan Bank
Contract date	Dec. 20, 2019	Dec. 20, 2019	Dec. 20, 2019
Matrurity date	Jan. 28, 2020	Jan. 28, 2020	Jan. 28, 2020
Contract Amount Pay	₩ 5,806
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,161.25	1,161.25	1,161.25
Derivative Counterparty	Shinhan Bank	Shinhan Bank	Shinhan Bank
Contract date	Dec. 26, 2019	Dec. 26, 2019	Dec. 26, 2019
Matrurity date	Jan. 30, 2020	Jan. 30, 2020	Jan. 30, 2020
Contract Amount Pay	₩ 7,539
Contract Amount Receive | $		$ 6,500
Contract exchange rate	1,159.85	1,159.85	1,159.85
Derivative Counterparty	Woori Bank	Woori Bank	Woori Bank
Contract date	Dec. 26, 2019	Dec. 26, 2019	Dec. 26, 2019
Matrurity date	Jan. 30, 2020	Jan. 30, 2020	Jan. 30, 2020
Contract Amount Pay	₩ 4,060
Contract Amount Receive | $		$ 3,500
Contract exchange rate	1,159.90	1,159.90	1,159.90
Derivative Counterparty	Shinhan Bank	Shinhan Bank	Shinhan Bank
Contract date	Dec. 30, 2019	Dec. 30, 2019	Dec. 30, 2019
Matrurity date	Feb. 3, 2020	Feb. 3, 2020	Feb. 3, 2020
Contract Amount Pay	₩ 4,049
Contract Amount Receive | $		$ 3,500
Contract exchange rate	1,156.80	1,156.80	1,156.80
Derivative Counterparty	Hana Bank	Hana Bank	Hana Bank
Contract date	Jul. 31, 2019	Jul. 31, 2019	Jul. 31, 2019
Matrurity date	Jul. 14, 2020	Jul. 14, 2020	Jul. 14, 2020
Contract Amount Pay	₩ 4,993
Contract Amount Receive | $		$ 4,257
Contract exchange rate	1,173	1,173	1,173

Derivative Currency swap contra

Derivative Currency swap contract List (Details) - 12 months ended Dec. 31, 2019 - Currency swap contracts € in Thousands, kr in Thousands, SFr in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, ₩ in Millions	KRW (₩)	USD ($)	EUR (€)	AUD ($)	CHF (SFr)	HKD ($)	SEK (kr)
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Standard Chartered	Standard Chartered	Standard Chartered	Standard Chartered	Standard Chartered	Standard Chartered	Standard Chartered
Contract Amount Pay	₩ 102,470
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,024.70	1,024.70	1,024.70	1,024.70	1,024.70	1,024.70	1,024.70
Derivative, Term of Contract	2014~2029	2014~2029	2014~2029	2014~2029	2014~2029	2014~2029	2014~2029
Contract Interest rate Pay	3.14%	3.14%	3.14%	3.14%	3.14%	3.14%	3.14%
Contract Interest rate Receive	3.57%	3.57%	3.57%	3.57%	3.57%	3.57%	3.57%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Societe Generale	Societe Generale	Societe Generale	Societe Generale	Societe Generale	Societe Generale	Societe Generale
Contract Amount Pay	₩ 105,017
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,050.17	1,050.17	1,050.17	1,050.17	1,050.17	1,050.17	1,050.17
Derivative, Term of Contract	2014~2024	2014~2024	2014~2024	2014~2024	2014~2024	2014~2024	2014~2024
Contract Interest rate Pay	4.92%	4.92%	4.92%	4.92%	4.92%	4.92%	4.92%
Contract Interest rate Receive	5.13%	5.13%	5.13%	5.13%	5.13%	5.13%	5.13%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank
Contract Amount Pay	₩ 107,970
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,079.70	1,079.70	1,079.70	1,079.70	1,079.70	1,079.70	1,079.70
Derivative, Term of Contract	2015~2024	2015~2024	2015~2024	2015~2024	2015~2024	2015~2024	2015~2024
Contract Interest rate Pay	4.75%	4.75%	4.75%	4.75%	4.75%	4.75%	4.75%
Contract Interest rate Receive	5.13%	5.13%	5.13%	5.13%	5.13%	5.13%	5.13%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Credit Agricole	Credit Agricole	Credit Agricole	Credit Agricole	Credit Agricole	Credit Agricole	Credit Agricole
Contract Amount Pay	₩ 94,219
Contract Amount Receive | $		$ 86,920
Contract exchange rate	1,083.97	1,083.97	1,083.97	1,083.97	1,083.97	1,083.97	1,083.97
Derivative, Term of Contract	2015~2024	2015~2024	2015~2024	2015~2024	2015~2024	2015~2024	2015~2024
Contract Interest rate Pay	4.85%	4.85%	4.85%	4.85%	4.85%	4.85%	4.85%
Contract Interest rate Receive	5.13%	5.13%	5.13%	5.13%	5.13%	5.13%	5.13%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank
Contract Amount Pay	₩ 21,708
Contract Amount Receive | $		$ 19,417
Contract exchange rate	1,118	1,118	1,118	1,118	1,118	1,118	1,118
Derivative, Term of Contract	2019~2027	2019~2027	2019~2027	2019~2027	2019~2027	2019~2027	2019~2027
Contract Interest rate Pay	5.04%	5.04%	5.04%	5.04%	5.04%	5.04%	5.04%
Contract Interest rate Receive	6.75%	6.75%	6.75%	6.75%	6.75%	6.75%	6.75%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank
Contract Amount Pay	₩ 296,000
Contract Amount Receive | $		$ 250,000
Contract exchange rate	1,184	1,184	1,184	1,184	1,184	1,184	1,184
Derivative, Term of Contract	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024
Contract Interest rate Pay	1.21%	1.21%	1.21%	1.21%	1.21%	1.21%	1.21%
Contract Interest rate Receive	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank
Contract Amount Pay	₩ 177,600
Contract Amount Receive | $		$ 150,000
Contract exchange rate	1,184	1,184	1,184	1,184	1,184	1,184	1,184
Derivative, Term of Contract	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024
Contract Interest rate Pay	1.24%	1.24%	1.24%	1.24%	1.24%	1.24%	1.24%
Contract Interest rate Receive	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank
Contract Amount Pay	₩ 118,400
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,184	1,184	1,184	1,184	1,184	1,184	1,184
Derivative, Term of Contract	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024
Contract Interest rate Pay	1.24%	1.24%	1.24%	1.24%	1.24%	1.24%	1.24%
Contract Interest rate Receive	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Citibank	Citibank	Citibank	Citibank	Citibank	Citibank	Citibank
Contract Amount Pay	₩ 112,930
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,129.30	1,129.30	1,129.30	1,129.30	1,129.30	1,129.30	1,129.30
Derivative, Term of Contract	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022
Contract Interest rate Pay	2.79%	2.79%	2.79%	2.79%	2.79%	2.79%	2.79%
Contract Interest rate Receive	3.00%	3.00%	3.00%	3.00%	3.00%	3.00%	3.00%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	JP Morgan	JP Morgan	JP Morgan	JP Morgan	JP Morgan	JP Morgan	JP Morgan
Contract Amount Pay	₩ 112,930
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,129.30	1,129.30	1,129.30	1,129.30	1,129.30	1,129.30	1,129.30
Derivative, Term of Contract	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022
Contract Interest rate Pay	2.79%	2.79%	2.79%	2.79%	2.79%	2.79%	2.79%
Contract Interest rate Receive	3.00%	3.00%	3.00%	3.00%	3.00%	3.00%	3.00%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Bank of America	Bank of America	Bank of America	Bank of America	Bank of America	Bank of America	Bank of America
Contract Amount Pay	₩ 112,930
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,129.30	1,129.30	1,129.30	1,129.30	1,129.30	1,129.30	1,129.30
Derivative, Term of Contract	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022
Contract Interest rate Pay	2.79%	2.79%	2.79%	2.79%	2.79%	2.79%	2.79%
Contract Interest rate Receive	3.00%	3.00%	3.00%	3.00%	3.00%	3.00%	3.00%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank
Contract Amount Pay	₩ 112,930
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,129.30	1,129.30	1,129.30	1,129.30	1,129.30	1,129.30	1,129.30
Derivative, Term of Contract	2016~2022	2016~2022	2016~2022	2016~2022	2016~2022	2016~2022	2016~2022
Contract Interest rate Pay	2.79%	2.79%	2.79%	2.79%	2.79%	2.79%	2.79%
Contract Interest rate Receive	3.00%	3.00%	3.00%	3.00%	3.00%	3.00%	3.00%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	HSBC	HSBC	HSBC	HSBC	HSBC	HSBC	HSBC
Contract Amount Pay	₩ 111,770
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,117.70	1,117.70	1,117.70	1,117.70	1,117.70	1,117.70	1,117.70
Derivative, Term of Contract	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022
Contract Interest rate Pay	2.89%	2.89%	2.89%	2.89%	2.89%	2.89%	2.89%
Contract Interest rate Receive	3.00%	3.00%	3.00%	3.00%	3.00%	3.00%	3.00%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank
Contract Amount Pay	₩ 111,770
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,117.70	1,117.70	1,117.70	1,117.70	1,117.70	1,117.70	1,117.70
Derivative, Term of Contract	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022
Contract Interest rate Pay	2.87%	2.87%	2.87%	2.87%	2.87%	2.87%	2.87%
Contract Interest rate Receive	3.00%	3.00%	3.00%	3.00%	3.00%	3.00%	3.00%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Standard Chartered	Standard Chartered	Standard Chartered	Standard Chartered	Standard Chartered	Standard Chartered	Standard Chartered
Contract Amount Pay	₩ 111,770
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,117.70	1,117.70	1,117.70	1,117.70	1,117.70	1,117.70	1,117.70
Derivative, Term of Contract	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022
Contract Interest rate Pay	2.89%	2.89%	2.89%	2.89%	2.89%	2.89%	2.89%
Contract Interest rate Receive	3.00%	3.00%	3.00%	3.00%	3.00%	3.00%	3.00%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Deutsche Bank	Deutsche Bank	Deutsche Bank	Deutsche Bank	Deutsche Bank	Deutsche Bank	Deutsche Bank
Contract Amount Pay	₩ 55,885
Contract Amount Receive | $		$ 50,000
Contract exchange rate	1,117.70	1,117.70	1,117.70	1,117.70	1,117.70	1,117.70	1,117.70
Derivative, Term of Contract	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022
Contract Interest rate Pay	2.79%	2.79%	2.79%	2.79%	2.79%	2.79%	2.79%
Contract Interest rate Receive	3.00%	3.00%	3.00%	3.00%	3.00%	3.00%	3.00%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Nomura	Nomura	Nomura	Nomura	Nomura	Nomura	Nomura
Contract Amount Pay	₩ 111,190
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,111.90	1,111.90	1,111.90	1,111.90	1,111.90	1,111.90	1,111.90
Derivative, Term of Contract	2015~2025	2015~2025	2015~2025	2015~2025	2015~2025	2015~2025	2015~2025
Contract Interest rate Pay	2.60%	2.60%	2.60%	2.60%	2.60%	2.60%	2.60%
Contract Interest rate Receive	3.25%	3.25%	3.25%	3.25%	3.25%	3.25%	3.25%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank
Contract Amount Pay	₩ 111,190
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,111.90	1,111.90	1,111.90	1,111.90	1,111.90	1,111.90	1,111.90
Derivative, Term of Contract	2015~2025	2015~2025	2015~2025	2015~2025	2015~2025	2015~2025	2015~2025
Contract Interest rate Pay	2.62%	2.62%	2.62%	2.62%	2.62%	2.62%	2.62%
Contract Interest rate Receive	3.25%	3.25%	3.25%	3.25%	3.25%	3.25%	3.25%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank
Contract Amount Pay	₩ 55,595
Contract Amount Receive | $		$ 50,000
Contract exchange rate	1,111.90	1,111.90	1,111.90	1,111.90	1,111.90	1,111.90	1,111.90
Derivative, Term of Contract	2015~2025	2015~2025	2015~2025	2015~2025	2015~2025	2015~2025	2015~2025
Contract Interest rate Pay	2.62%	2.62%	2.62%	2.62%	2.62%	2.62%	2.62%
Contract Interest rate Receive	3.25%	3.25%	3.25%	3.25%	3.25%	3.25%	3.25%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank
Contract Amount Pay	₩ 55,595
Contract Amount Receive | $		$ 50,000
Contract exchange rate	1,111.90	1,111.90	1,111.90	1,111.90	1,111.90	1,111.90	1,111.90
Derivative, Term of Contract	2015~2025	2015~2025	2015~2025	2015~2025	2015~2025	2015~2025	2015~2025
Contract Interest rate Pay	2.62%	2.62%	2.62%	2.62%	2.62%	2.62%	2.62%
Contract Interest rate Receive	3.25%	3.25%	3.25%	3.25%	3.25%	3.25%	3.25%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank
Contract Amount Pay	₩ 111,610
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,116.10	1,116.10	1,116.10	1,116.10	1,116.10	1,116.10	1,116.10
Derivative, Term of Contract	2017~2027	2017~2027	2017~2027	2017~2027	2017~2027	2017~2027	2017~2027
Contract Interest rate Pay	2.25%	2.25%	2.25%	2.25%	2.25%	2.25%	2.25%
Contract Interest rate Receive	3.13%	3.13%	3.13%	3.13%	3.13%	3.13%	3.13%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank
Contract Amount Pay	₩ 111,610
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,116.10	1,116.10	1,116.10	1,116.10	1,116.10	1,116.10	1,116.10
Derivative, Term of Contract	2017~2027	2017~2027	2017~2027	2017~2027	2017~2027	2017~2027	2017~2027
Contract Interest rate Pay	2.31%	2.31%	2.31%	2.31%	2.31%	2.31%	2.31%
Contract Interest rate Receive	3.13%	3.13%	3.13%	3.13%	3.13%	3.13%	3.13%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank
Contract Amount Pay	₩ 111,610
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,116.10	1,116.10	1,116.10	1,116.10	1,116.10	1,116.10	1,116.10
Derivative, Term of Contract	2017~2027	2017~2027	2017~2027	2017~2027	2017~2027	2017~2027	2017~2027
Contract Interest rate Pay	2.31%	2.31%	2.31%	2.31%	2.31%	2.31%	2.31%
Contract Interest rate Receive	3.13%	3.13%	3.13%	3.13%	3.13%	3.13%	3.13%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank
Contract Amount Pay	₩ 108,600
Contract Amount Receive | $						$ 800,000
Contract exchange rate	135.75	135.75	135.75	135.75	135.75	135.75	135.75
Derivative, Term of Contract	2018~2028	2018~2028	2018~2028	2018~2028	2018~2028	2018~2028	2018~2028
Contract Interest rate Pay	2.69%	2.69%	2.69%	2.69%	2.69%	2.69%	2.69%
Contract Interest rate Receive	3.35%	3.35%	3.35%	3.35%	3.35%	3.35%	3.35%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank
Contract Amount Pay	₩ 115,388
Contract Amount Receive | $						$ 850,000
Contract exchange rate	135.75	135.75	135.75	135.75	135.75	135.75	135.75
Derivative, Term of Contract	2018~2028	2018~2028	2018~2028	2018~2028	2018~2028	2018~2028	2018~2028
Contract Interest rate Pay	2.66%	2.66%	2.66%	2.66%	2.66%	2.66%	2.66%
Contract Interest rate Receive	3.35%	3.35%	3.35%	3.35%	3.35%	3.35%	3.35%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank
Contract Amount Pay	₩ 170,280
Contract Amount Receive | $		$ 150,000
Contract exchange rate	1,135.20	1,135.20	1,135.20	1,135.20	1,135.20	1,135.20	1,135.20
Derivative, Term of Contract	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023
Contract Interest rate Pay	2.15%	2.15%	2.15%	2.15%	2.15%	2.15%	2.15%
Contract Interest rate Receive	3.75%	3.75%	3.75%	3.75%	3.75%	3.75%	3.75%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank
Contract Amount Pay	₩ 170,280
Contract Amount Receive | $		$ 150,000
Contract exchange rate	1,135.20	1,135.20	1,135.20	1,135.20	1,135.20	1,135.20	1,135.20
Derivative, Term of Contract	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023
Contract Interest rate Pay	2.18%	2.18%	2.18%	2.18%	2.18%	2.18%	2.18%
Contract Interest rate Receive	3.75%	3.75%	3.75%	3.75%	3.75%	3.75%	3.75%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank
Contract Amount Pay	₩ 113,520
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,135.20	1,135.20	1,135.20	1,135.20	1,135.20	1,135.20	1,135.20
Derivative, Term of Contract	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023
Contract Interest rate Pay	2.17%	2.17%	2.17%	2.17%	2.17%	2.17%	2.17%
Contract Interest rate Receive	3.75%	3.75%	3.75%	3.75%	3.75%	3.75%	3.75%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank
Contract Amount Pay	₩ 227,040
Contract Amount Receive | $		$ 200,000
Contract exchange rate	1,135.20	1,135.20	1,135.20	1,135.20	1,135.20	1,135.20	1,135.20
Derivative, Term of Contract	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023
Contract Interest rate Pay	2.17%	2.17%	2.17%	2.17%	2.17%	2.17%	2.17%
Contract Interest rate Receive	3.75%	3.75%	3.75%	3.75%	3.75%	3.75%	3.75%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Citibank	Citibank	Citibank	Citibank	Citibank	Citibank	Citibank
Contract Amount Pay	₩ 239,956
Contract Amount Receive | SFr					SFr 200,000
Contract exchange rate	1,199.78	1,199.78	1,199.78	1,199.78	1,199.78	1,199.78	1,199.78
Derivative, Term of Contract	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024
Contract Interest rate Pay	1.44%	1.44%	1.44%	1.44%	1.44%	1.44%	1.44%
Contract Interest rate Receive	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank
Contract Amount Pay	₩ 119,978
Contract Amount Receive | SFr					SFr 100,000
Contract exchange rate	1,199.78	1,199.78	1,199.78	1,199.78	1,199.78	1,199.78	1,199.78
Derivative, Term of Contract	2019~2027	2019~2027	2019~2027	2019~2027	2019~2027	2019~2027	2019~2027
Contract Interest rate Pay	1.43%	1.43%	1.43%	1.43%	1.43%	1.43%	1.43%
Contract Interest rate Receive	0.05%	0.05%	0.05%	0.05%	0.05%	0.05%	0.05%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	HSBC	HSBC	HSBC	HSBC	HSBC	HSBC	HSBC
Contract Amount Pay | $		$ 205,500
Contract Amount Receive | $				$ 300,000
Contract exchange rate	0.69	0.69	0.69	0.69	0.69	0.69	0.69
Derivative, Term of Contract	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024
Contract Interest rate Pay	3M Libor+0.78%	3M Libor+0.78%	3M Libor+0.78%	3M Libor+0.78%	3M Libor+0.78%	3M Libor+0.78%	3M Libor+0.78%
Contract Interest rate Receive	3M BBSW+0.97%	3M BBSW+0.97%	3M BBSW+0.97%	3M BBSW+0.97%	3M BBSW+0.97%	3M BBSW+0.97%	3M BBSW+0.97%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	HSBC	HSBC	HSBC	HSBC	HSBC	HSBC	HSBC
Contract Amount Pay	₩ 99,901
Contract Amount Receive | $				$ 100,000
Contract exchange rate	999.01	999.01	999.01	999.01	999.01	999.01	999.01
Derivative, Term of Contract	2014~2020	2014~2020	2014~2020	2014~2020	2014~2020	2014~2020	2014~2020
Contract Interest rate Pay	3.52%	3.52%	3.52%	3.52%	3.52%	3.52%	3.52%
Contract Interest rate Receive	5.75%	5.75%	5.75%	5.75%	5.75%	5.75%	5.75%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	HSBC	HSBC	HSBC	HSBC	HSBC	HSBC	HSBC
Contract Amount Pay	₩ 100,482
Contract Amount Receive | $				$ 100,000
Contract exchange rate	1,004.82	1,004.82	1,004.82	1,004.82	1,004.82	1,004.82	1,004.82
Derivative, Term of Contract	2014~2020	2014~2020	2014~2020	2014~2020	2014~2020	2014~2020	2014~2020
Contract Interest rate Pay	3.48%	3.48%	3.48%	3.48%	3.48%	3.48%	3.48%
Contract Interest rate Receive	5.75%	5.75%	5.75%	5.75%	5.75%	5.75%	5.75%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Standard Chartered	Standard Chartered	Standard Chartered	Standard Chartered	Standard Chartered	Standard Chartered	Standard Chartered
Contract Amount Pay | $		$ 117,250
Contract Amount Receive | $				$ 125,000
Contract exchange rate	0.94	0.94	0.94	0.94	0.94	0.94	0.94
Derivative, Term of Contract	2013~2020	2013~2020	2013~2020	2013~2020	2013~2020	2013~2020	2013~2020
Contract Interest rate Pay	3M Libor + 1.25%	3M Libor + 1.25%	3M Libor + 1.25%	3M Libor + 1.25%	3M Libor + 1.25%	3M Libor + 1.25%	3M Libor + 1.25%
Contract Interest rate Receive	5.75%	5.75%	5.75%	5.75%	5.75%	5.75%	5.75%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Standard Chartered	Standard Chartered	Standard Chartered	Standard Chartered	Standard Chartered	Standard Chartered	Standard Chartered
Contract Amount Pay	₩ 126,032
Contract Amount Receive | $		$ 117,250
Contract exchange rate	1,074.90	1,074.90	1,074.90	1,074.90	1,074.90	1,074.90	1,074.90
Derivative, Term of Contract	2014~2020	2014~2020	2014~2020	2014~2020	2014~2020	2014~2020	2014~2020
Contract Interest rate Pay	3.55%	3.55%	3.55%	3.55%	3.55%	3.55%	3.55%
Contract Interest rate Receive	3M Libor + 1.25%	3M Libor + 1.25%	3M Libor + 1.25%	3M Libor + 1.25%	3M Libor + 1.25%	3M Libor + 1.25%	3M Libor + 1.25%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank
Contract Amount Pay	₩ 114,580
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,145.80	1,145.80	1,145.80	1,145.80	1,145.80	1,145.80	1,145.80
Derivative, Term of Contract	2017~2020	2017~2020	2017~2020	2017~2020	2017~2020	2017~2020	2017~2020
Contract Interest rate Pay	1.75%	1.75%	1.75%	1.75%	1.75%	1.75%	1.75%
Contract Interest rate Receive	2.38%	2.38%	2.38%	2.38%	2.38%	2.38%	2.38%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank
Contract Amount Pay	₩ 114,580
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,145.80	1,145.80	1,145.80	1,145.80	1,145.80	1,145.80	1,145.80
Derivative, Term of Contract	2017~2020	2017~2020	2017~2020	2017~2020	2017~2020	2017~2020	2017~2020
Contract Interest rate Pay	1.75%	1.75%	1.75%	1.75%	1.75%	1.75%	1.75%
Contract Interest rate Receive	2.38%	2.38%	2.38%	2.38%	2.38%	2.38%	2.38%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Export-import bank of Korea	Export-import bank of Korea	Export-import bank of Korea	Export-import bank of Korea	Export-import bank of Korea	Export-import bank of Korea	Export-import bank of Korea
Contract Amount Pay	₩ 114,580
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,145.80	1,145.80	1,145.80	1,145.80	1,145.80	1,145.80	1,145.80
Derivative, Term of Contract	2017~2020	2017~2020	2017~2020	2017~2020	2017~2020	2017~2020	2017~2020
Contract Interest rate Pay	1.75%	1.75%	1.75%	1.75%	1.75%	1.75%	1.75%
Contract Interest rate Receive	2.38%	2.38%	2.38%	2.38%	2.38%	2.38%	2.38%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank
Contract Amount Pay	₩ 121,000
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,210	1,210	1,210	1,210	1,210	1,210	1,210
Derivative, Term of Contract	2016~2021	2016~2021	2016~2021	2016~2021	2016~2021	2016~2021	2016~2021
Contract Interest rate Pay	2.15%	2.15%	2.15%	2.15%	2.15%	2.15%	2.15%
Contract Interest rate Receive	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Morgan Stanley	Morgan Stanley	Morgan Stanley	Morgan Stanley	Morgan Stanley	Morgan Stanley	Morgan Stanley
Contract Amount Pay	₩ 121,000
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,210	1,210	1,210	1,210	1,210	1,210	1,210
Derivative, Term of Contract	2016~2021	2016~2021	2016~2021	2016~2021	2016~2021	2016~2021	2016~2021
Contract Interest rate Pay	3M Libor + 2.10%	3M Libor + 2.10%	3M Libor + 2.10%	3M Libor + 2.10%	3M Libor + 2.10%	3M Libor + 2.10%	3M Libor + 2.10%
Contract Interest rate Receive	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	BNP Paribas	BNP Paribas	BNP Paribas	BNP Paribas	BNP Paribas	BNP Paribas	BNP Paribas
Contract Amount Pay	₩ 121,000
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,210	1,210	1,210	1,210	1,210	1,210	1,210
Derivative, Term of Contract	2016~2021	2016~2021	2016~2021	2016~2021	2016~2021	2016~2021	2016~2021
Contract Interest rate Pay	3M Libor + 2.10%	3M Libor + 2.10%	3M Libor + 2.10%	3M Libor + 2.10%	3M Libor + 2.10%	3M Libor + 2.10%	3M Libor + 2.10%
Contract Interest rate Receive	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Nomura	Nomura	Nomura	Nomura	Nomura	Nomura	Nomura
Contract Amount Pay	₩ 52,457
Contract Amount Receive | €			€ 40,000
Contract exchange rate	1,311.42	1,311.42	1,311.42	1,311.42	1,311.42	1,311.42	1,311.42
Derivative, Term of Contract	2017~2037	2017~2037	2017~2037	2017~2037	2017~2037	2017~2037	2017~2037
Contract Interest rate Pay	2.60%	2.60%	2.60%	2.60%	2.60%	2.60%	2.60%
Contract Interest rate Receive	1.70%	1.70%	1.70%	1.70%	1.70%	1.70%	1.70%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Nomura	Nomura	Nomura	Nomura	Nomura	Nomura	Nomura
Contract Amount Pay	₩ 59,423
Contract Amount Receive | kr							kr 450,000
Contract exchange rate	132.05	132.05	132.05	132.05	132.05	132.05	132.05
Derivative, Term of Contract	2017~2037	2017~2037	2017~2037	2017~2037	2017~2037	2017~2037	2017~2037
Contract Interest rate Pay	2.62%	2.62%	2.62%	2.62%	2.62%	2.62%	2.62%
Contract Interest rate Receive	2.36%	2.36%	2.36%	2.36%	2.36%	2.36%	2.36%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank
Contract Amount Pay	₩ 112,650
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,126.50	1,126.50	1,126.50	1,126.50	1,126.50	1,126.50	1,126.50
Derivative, Term of Contract	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022
Contract Interest rate Pay	1.80%	1.80%	1.80%	1.80%	1.80%	1.80%	1.80%
Contract Interest rate Receive	3.38%	3.38%	3.38%	3.38%	3.38%	3.38%	3.38%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank
Contract Amount Pay	₩ 112,650
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,126.50	1,126.50	1,126.50	1,126.50	1,126.50	1,126.50	1,126.50
Derivative, Term of Contract	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022
Contract Interest rate Pay	1.80%	1.80%	1.80%	1.80%	1.80%	1.80%	1.80%
Contract Interest rate Receive	3.38%	3.38%	3.38%	3.38%	3.38%	3.38%	3.38%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank
Contract Amount Pay	₩ 112,650
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,126.50	1,126.50	1,126.50	1,126.50	1,126.50	1,126.50	1,126.50
Derivative, Term of Contract	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022
Contract Interest rate Pay	1.80%	1.80%	1.80%	1.80%	1.80%	1.80%	1.80%
Contract Interest rate Receive	3.38%	3.38%	3.38%	3.38%	3.38%	3.38%	3.38%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank
Contract Amount Pay	₩ 320,880
Contract Amount Receive | $		$ 300,000
Contract exchange rate	1,069.60	1,069.60	1,069.60	1,069.60	1,069.60	1,069.60	1,069.60
Derivative, Term of Contract	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023
Contract Interest rate Pay	2.03%	2.03%	2.03%	2.03%	2.03%	2.03%	2.03%
Contract Interest rate Receive	3.75%	3.75%	3.75%	3.75%	3.75%	3.75%	3.75%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	BNP Paribas	BNP Paribas	BNP Paribas	BNP Paribas	BNP Paribas	BNP Paribas	BNP Paribas
Contract Amount Pay	₩ 111,841
Contract Amount Receive | SFr					SFr 100,000
Contract exchange rate	1,118.41	1,118.41	1,118.41	1,118.41	1,118.41	1,118.41	1,118.41
Derivative, Term of Contract	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024
Contract Interest rate Pay	1.78%	1.78%	1.78%	1.78%	1.78%	1.78%	1.78%
Contract Interest rate Receive	0.13%	0.13%	0.13%	0.13%	0.13%	0.13%	0.13%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank
Contract Amount Pay	₩ 111,841
Contract Amount Receive | SFr					SFr 100,000
Contract exchange rate	1,118.41	1,118.41	1,118.41	1,118.41	1,118.41	1,118.41	1,118.41
Derivative, Term of Contract	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024
Contract Interest rate Pay	1.78%	1.78%	1.78%	1.78%	1.78%	1.78%	1.78%
Contract Interest rate Receive	0.13%	0.13%	0.13%	0.13%	0.13%	0.13%	0.13%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank
Contract Amount Pay	₩ 117,340
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,173.40	1,173.40	1,173.40	1,173.40	1,173.40	1,173.40	1,173.40
Derivative, Term of Contract	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022
Contract Interest rate Pay	1.06%	1.06%	1.06%	1.06%	1.06%	1.06%	1.06%
Contract Interest rate Receive	2.38%	2.38%	2.38%	2.38%	2.38%	2.38%	2.38%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank
Contract Amount Pay	₩ 117,340
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,173.40	1,173.40	1,173.40	1,173.40	1,173.40	1,173.40	1,173.40
Derivative, Term of Contract	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022
Contract Interest rate Pay	1.06%	1.06%	1.06%	1.06%	1.06%	1.06%	1.06%
Contract Interest rate Receive	2.38%	2.38%	2.38%	2.38%	2.38%	2.38%	2.38%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank
Contract Amount Pay	₩ 117,340
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,173.40	1,173.40	1,173.40	1,173.40	1,173.40	1,173.40	1,173.40
Derivative, Term of Contract	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022
Contract Interest rate Pay	1.06%	1.06%	1.06%	1.06%	1.06%	1.06%	1.06%
Contract Interest rate Receive	2.38%	2.38%	2.38%	2.38%	2.38%	2.38%	2.38%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank
Contract Amount Pay	₩ 212,960
Contract Amount Receive | $		$ 200,000
Contract exchange rate	1,064.80	1,064.80	1,064.80	1,064.80	1,064.80	1,064.80	1,064.80
Derivative, Term of Contract	2018~2021	2018~2021	2018~2021	2018~2021	2018~2021	2018~2021	2018~2021
Contract Interest rate Pay	2.10%	2.10%	2.10%	2.10%	2.10%	2.10%	2.10%
Contract Interest rate Receive	3.00%	3.00%	3.00%	3.00%	3.00%	3.00%	3.00%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank
Contract Amount Pay	₩ 212,960
Contract Amount Receive | $		$ 200,000
Contract exchange rate	1,064.80	1,064.80	1,064.80	1,064.80	1,064.80	1,064.80	1,064.80
Derivative, Term of Contract	2018~2021	2018~2021	2018~2021	2018~2021	2018~2021	2018~2021	2018~2021
Contract Interest rate Pay	2.10%	2.10%	2.10%	2.10%	2.10%	2.10%	2.10%
Contract Interest rate Receive	3.00%	3.00%	3.00%	3.00%	3.00%	3.00%	3.00%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Credit Agricole	Credit Agricole	Credit Agricole	Credit Agricole	Credit Agricole	Credit Agricole	Credit Agricole
Contract Amount Pay	₩ 110,680
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,106.80	1,106.80	1,106.80	1,106.80	1,106.80	1,106.80	1,106.80
Derivative, Term of Contract	2014~2020	2014~2020	2014~2020	2014~2020	2014~2020	2014~2020	2014~2020
Contract Interest rate Pay	2.29%	2.29%	2.29%	2.29%	2.29%	2.29%	2.29%
Contract Interest rate Receive	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Societe Generale	Societe Generale	Societe Generale	Societe Generale	Societe Generale	Societe Generale	Societe Generale
Contract Amount Pay	₩ 55,340
Contract Amount Receive | $		$ 50,000
Contract exchange rate	1,106.80	1,106.80	1,106.80	1,106.80	1,106.80	1,106.80	1,106.80
Derivative, Term of Contract	2014~2020	2014~2020	2014~2020	2014~2020	2014~2020	2014~2020	2014~2020
Contract Interest rate Pay	2.16%	2.16%	2.16%	2.16%	2.16%	2.16%	2.16%
Contract Interest rate Receive	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank
Contract Amount Pay	₩ 55,340
Contract Amount Receive | $		$ 50,000
Contract exchange rate	1,106.80	1,106.80	1,106.80	1,106.80	1,106.80	1,106.80	1,106.80
Derivative, Term of Contract	2014~2020	2014~2020	2014~2020	2014~2020	2014~2020	2014~2020	2014~2020
Contract Interest rate Pay	2.16%	2.16%	2.16%	2.16%	2.16%	2.16%	2.16%
Contract Interest rate Receive	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank
Contract Amount Pay	₩ 55,340
Contract Amount Receive | $		$ 50,000
Contract exchange rate	1,106.80	1,106.80	1,106.80	1,106.80	1,106.80	1,106.80	1,106.80
Derivative, Term of Contract	2014~2020	2014~2020	2014~2020	2014~2020	2014~2020	2014~2020	2014~2020
Contract Interest rate Pay	2.21%	2.21%	2.21%	2.21%	2.21%	2.21%	2.21%
Contract Interest rate Receive	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Standard Chartered	Standard Chartered	Standard Chartered	Standard Chartered	Standard Chartered	Standard Chartered	Standard Chartered
Contract Amount Pay	₩ 55,340
Contract Amount Receive | $		$ 50,000
Contract exchange rate	1,106.80	1,106.80	1,106.80	1,106.80	1,106.80	1,106.80	1,106.80
Derivative, Term of Contract	2014~2020	2014~2020	2014~2020	2014~2020	2014~2020	2014~2020	2014~2020
Contract Interest rate Pay	2.21%	2.21%	2.21%	2.21%	2.21%	2.21%	2.21%
Contract Interest rate Receive	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	HSBC	HSBC	HSBC	HSBC	HSBC	HSBC	HSBC
Contract Amount Pay	₩ 55,340
Contract Amount Receive | $		$ 50,000
Contract exchange rate	1,106.80	1,106.80	1,106.80	1,106.80	1,106.80	1,106.80	1,106.80
Derivative, Term of Contract	2014~2020	2014~2020	2014~2020	2014~2020	2014~2020	2014~2020	2014~2020
Contract Interest rate Pay	2.21%	2.21%	2.21%	2.21%	2.21%	2.21%	2.21%
Contract Interest rate Receive	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Nomura	Nomura	Nomura	Nomura	Nomura	Nomura	Nomura
Contract Amount Pay	₩ 55,340
Contract Amount Receive | $		$ 50,000
Contract exchange rate	1,106.80	1,106.80	1,106.80	1,106.80	1,106.80	1,106.80	1,106.80
Derivative, Term of Contract	2014~2020	2014~2020	2014~2020	2014~2020	2014~2020	2014~2020	2014~2020
Contract Interest rate Pay	2.21%	2.21%	2.21%	2.21%	2.21%	2.21%	2.21%
Contract Interest rate Receive	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	BNP Paribas	BNP Paribas	BNP Paribas	BNP Paribas	BNP Paribas	BNP Paribas	BNP Paribas
Contract Amount Pay	₩ 55,340
Contract Amount Receive | $		$ 50,000
Contract exchange rate	1,106.80	1,106.80	1,106.80	1,106.80	1,106.80	1,106.80	1,106.80
Derivative, Term of Contract	2014~2020	2014~2020	2014~2020	2014~2020	2014~2020	2014~2020	2014~2020
Contract Interest rate Pay	2.21%	2.21%	2.21%	2.21%	2.21%	2.21%	2.21%
Contract Interest rate Receive	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	HSBC	HSBC	HSBC	HSBC	HSBC	HSBC	HSBC
Contract Amount Pay	₩ 55,340
Contract Amount Receive | $		$ 50,000
Contract exchange rate	1,106.80	1,106.80	1,106.80	1,106.80	1,106.80	1,106.80	1,106.80
Derivative, Term of Contract	2014~2020	2014~2020	2014~2020	2014~2020	2014~2020	2014~2020	2014~2020
Contract Interest rate Pay	2.21%	2.21%	2.21%	2.21%	2.21%	2.21%	2.21%
Contract Interest rate Receive	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank
Contract Amount Pay	₩ 226,600
Contract Amount Receive | $		$ 200,000
Contract exchange rate	1,133	1,133	1,133	1,133	1,133	1,133	1,133
Derivative, Term of Contract	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022
Contract Interest rate Pay	1.94%	1.94%	1.94%	1.94%	1.94%	1.94%	1.94%
Contract Interest rate Receive	2.63%	2.63%	2.63%	2.63%	2.63%	2.63%	2.63%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank
Contract Amount Pay	₩ 113,300
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,133	1,133	1,133	1,133	1,133	1,133	1,133
Derivative, Term of Contract	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022
Contract Interest rate Pay	1.94%	1.94%	1.94%	1.94%	1.94%	1.94%	1.94%
Contract Interest rate Receive	2.63%	2.63%	2.63%	2.63%	2.63%	2.63%	2.63%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Nomura	Nomura	Nomura	Nomura	Nomura	Nomura	Nomura
Contract Amount Pay	₩ 113,300
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,133	1,133	1,133	1,133	1,133	1,133	1,133
Derivative, Term of Contract	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022
Contract Interest rate Pay	1.95%	1.95%	1.95%	1.95%	1.95%	1.95%	1.95%
Contract Interest rate Receive	2.63%	2.63%	2.63%	2.63%	2.63%	2.63%	2.63%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank
Contract Amount Pay	₩ 56,650
Contract Amount Receive | $		$ 50,000
Contract exchange rate	1,133	1,133	1,133	1,133	1,133	1,133	1,133
Derivative, Term of Contract	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022
Contract Interest rate Pay	1.95%	1.95%	1.95%	1.95%	1.95%	1.95%	1.95%
Contract Interest rate Receive	2.63%	2.63%	2.63%	2.63%	2.63%	2.63%	2.63%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank
Contract Amount Pay	₩ 56,650
Contract Amount Receive | $		$ 50,000
Contract exchange rate	1,133	1,133	1,133	1,133	1,133	1,133	1,133
Derivative, Term of Contract	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022
Contract Interest rate Pay	1.95%	1.95%	1.95%	1.95%	1.95%	1.95%	1.95%
Contract Interest rate Receive	2.63%	2.63%	2.63%	2.63%	2.63%	2.63%	2.63%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank
Contract Amount Pay	₩ 169,335
Contract Amount Receive | $		$ 150,000
Contract exchange rate	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90
Derivative, Term of Contract	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023
Contract Interest rate Pay	2.26%	2.26%	2.26%	2.26%	2.26%	2.26%	2.26%
Contract Interest rate Receive	3.88%	3.88%	3.88%	3.88%	3.88%	3.88%	3.88%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank
Contract Amount Pay	₩ 169,335
Contract Amount Receive | $		$ 150,000
Contract exchange rate	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90
Derivative, Term of Contract	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023
Contract Interest rate Pay	2.26%	2.26%	2.26%	2.26%	2.26%	2.26%	2.26%
Contract Interest rate Receive	3.88%	3.88%	3.88%	3.88%	3.88%	3.88%	3.88%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Credit Agricole	Credit Agricole	Credit Agricole	Credit Agricole	Credit Agricole	Credit Agricole	Credit Agricole
Contract Amount Pay	₩ 112,890
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90
Derivative, Term of Contract	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023
Contract Interest rate Pay	2.26%	2.26%	2.26%	2.26%	2.26%	2.26%	2.26%
Contract Interest rate Receive	3.88%	3.88%	3.88%	3.88%	3.88%	3.88%	3.88%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank
Contract Amount Pay	₩ 56,445
Contract Amount Receive | $		$ 50,000
Contract exchange rate	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90
Derivative, Term of Contract	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023
Contract Interest rate Pay	2.26%	2.26%	2.26%	2.26%	2.26%	2.26%	2.26%
Contract Interest rate Receive	3.88%	3.88%	3.88%	3.88%	3.88%	3.88%	3.88%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank
Contract Amount Pay	₩ 56,445
Contract Amount Receive | $		$ 50,000
Contract exchange rate	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90
Derivative, Term of Contract	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023
Contract Interest rate Pay	2.26%	2.26%	2.26%	2.26%	2.26%	2.26%	2.26%
Contract Interest rate Receive	3.88%	3.88%	3.88%	3.88%	3.88%	3.88%	3.88%

Derivative Interest rate swap c

Derivative Interest rate swap contract List (Details) - 12 months ended Dec. 31, 2019 - Interest rate swap contracts $ in Thousands, ₩ in Millions		KRW (₩)	USD ($)
Not Designated as Hedging Instrument [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Hana Bank
Derivative, Term of Contract		2017~2022
Contract Interest rate Pay		2.01%
Contract Interest rate Receive		3M CD + 0.24%
Contract amount		₩ 100,000
Not Designated as Hedging Instrument [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Hana Bank
Derivative, Term of Contract		2017~2022
Contract Interest rate Pay		2.06%
Contract Interest rate Receive		3M CD + 0.27%
Contract amount		₩ 100,000
Not Designated as Hedging Instrument [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty	[1]	Nomura
Derivative, Term of Contract		2017~2037
Contract Interest rate Pay		2.05%
Contract Interest rate Receive		3.08%
Contract amount		₩ 30,000
Not Designated as Hedging Instrument [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Hana Bank
Derivative, Term of Contract		2017~2021
Contract Interest rate Pay		2.45%
Contract Interest rate Receive		3M CD + 0.32%
Contract amount		₩ 200,000
Not Designated as Hedging Instrument [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty	[2]	Nomura
Derivative, Term of Contract		2018~2038
Contract Interest rate Pay		2.56%
Contract Interest rate Receive		3.75%
Contract amount		₩ 30,000
Not Designated as Hedging Instrument [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Hana Bank
Derivative, Term of Contract		2018~2023
Contract Interest rate Pay		2.15%
Contract Interest rate Receive		3M CD + 0.19%
Contract amount		₩ 200,000
Not Designated as Hedging Instrument [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Hana Bank
Derivative, Term of Contract		2018~2023
Contract Interest rate Pay		2.17%
Contract Interest rate Receive		3M CD + 0.19%
Contract amount		₩ 200,000
Not Designated as Hedging Instrument [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Hana Bank
Derivative, Term of Contract		2018~2023
Contract Interest rate Pay		2.03%
Contract Interest rate Receive		3M CD + 0.21%
Contract amount		₩ 150,000
Not Designated as Hedging Instrument [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Hana Bank
Derivative, Term of Contract		2019~2024
Contract Interest rate Pay		1.87%
Contract Interest rate Receive		3M CD + 0.13%
Contract amount		₩ 200,000
Not Designated as Hedging Instrument [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Societe Generale
Derivative, Term of Contract		2017~2022
Contract Interest rate Pay		3M Libor + 3.44%
Contract Interest rate Receive		3.77%
Contract amount		₩ 200,000
Not Designated as Hedging Instrument [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Nomura
Derivative, Term of Contract		2017~2027
Contract Interest rate Pay		3M Libor + 2.25%
Contract Interest rate Receive		2.6%
Contract amount		₩ 52,457
Not Designated as Hedging Instrument [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Nomura
Derivative, Term of Contract		2017~2027
Contract Interest rate Pay		3M Libor + 2.27%
Contract Interest rate Receive		2.62%
Contract amount		₩ 59,423
Not Designated as Hedging Instrument [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Export-import bank of Korea
Derivative, Term of Contract		2015~2031
Contract Interest rate Pay		2.67%
Contract Interest rate Receive		6M USD Libor
Contract amount | $			$ 15,893
Not Designated as Hedging Instrument [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		ING Bank
Derivative, Term of Contract		2015~2031
Contract Interest rate Pay		2.67%
Contract Interest rate Receive		6M USD Libor
Contract amount | $			7,861
Not Designated as Hedging Instrument [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		BNP Paribas
Derivative, Term of Contract		2015~2031
Contract Interest rate Pay		2.67%
Contract Interest rate Receive		6M USD Libor
Contract amount | $			7,861
Designated as Hedging Instrument [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		BNP Paribas
Derivative, Term of Contract		2009~2027
Contract Interest rate Pay		4.16%
Contract Interest rate Receive		6M USD Libor
Contract amount | $			92,120
Designated as Hedging Instrument [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		KFW
Derivative, Term of Contract		2009~2027
Contract Interest rate Pay		4.16%
Contract Interest rate Receive		6M USD Libor
Contract amount | $			92,120
Designated as Hedging Instrument [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Export-import bank of Korea
Derivative, Term of Contract		2016~2036
Contract Interest rate Pay		3.00%
Contract Interest rate Receive		6M USD Libor
Contract amount | $			$ 80,514
[1]	2.05% of the contract paying interest rate is applied for five years from the date of issuance, and 3M CD + 0.10% is applied thereafter. Depending on exercise of counterparty's right, it can be reimbursed before the due on the same day of every year starting from September 18, 2022.
[2]	2.56% of the contract paying interest rate is applied for five years from the date of issuance, and 3M CD + 0.10% is applied thereafter. Depending on exercise of counterparty's right, it can be reimbursed before the due on the same day of every year starting from June 15, 2023.

Other-Financial Assets (Details

Other-Financial Assets (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2019	Dec. 31, 2018
Other Financial Assets [Line Items]
Current Other financial assets		₩ 1,415,204	₩ 1,991,939
Non-Current Other financial assets		1,283,730	1,044,762
Loans and receivables
Other Financial Assets [Line Items]
Current Other financial assets		63,233	122,653
Non-Current Other financial assets		675,474	596,021
Loans and receivables | Gross amount
Other Financial Assets [Line Items]
Current Other financial assets		64,111	123,657
Non-Current Other financial assets		725,755	639,673
Loans and receivables | Allowance for doubtful accounts
Other Financial Assets [Line Items]
Current Other financial assets		(31)	(12)
Non-Current Other financial assets		(15,063)	(4,940)
Loans and receivables | Present value discount
Other Financial Assets [Line Items]
Current Other financial assets		(847)	(992)
Non-Current Other financial assets		(35,218)	(38,712)
Short-term financial instruments
Other Financial Assets [Line Items]
Current Other financial assets	[1]	1,351,971	1,869,286
Long-term financial instruments
Other Financial Assets [Line Items]
Non-Current Other financial assets	[1]	608,256	448,741
Financial assets at fair value through profit or loss
Other Financial Assets [Line Items]
Current Other financial assets		0	0
Non-Current Other financial assets		₩ 0	₩ 0
[1]	From prior year, certain financial assets at fair value previously recognized as other financial assets is reclassified to financial assets at fair value through profit or loss upon the adoption of IFRS 9 'Financial Instruments'.

Other-Financial Assets _ Loans

Other-Financial Assets : Loans and receivables (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2019	Dec. 31, 2018
Loans and Leases Receivable Disclosure [Line Items]
Short-term loans and receivables Face value	₩ 64,111	₩ 123,657
Short-term loans and receivables Allowance for doubtful accounts	(31)	(12)
Short-term loans and receivables Present value discount	(847)	(992)
Short-term loans and receivables	63,233	122,653
Long-term loans and receivables Face value	725,755	639,673
Long-term loans and receivables Allowance for doubtful accounts	(15,063)	(4,940)
Long-term loans and receivables Present value discount	(35,218)	(38,712)
Long-term loans and receivables	675,474	596,021
Loans and receivables Face value	789,866	763,330
Loans and receivables Allowance for doubtful accounts	(15,094)	(4,952)
Loans and receivables Present value discount	(36,065)	(39,704)
Loans and receivables	738,707	718,674
Loans for tuition
Loans and Leases Receivable Disclosure [Line Items]
Short-term loans and receivables Face value	33,636	33,333
Short-term loans and receivables Allowance for doubtful accounts	0	0
Short-term loans and receivables Present value discount	(847)	(992)
Short-term loans and receivables	32,789	32,341
Long-term loans and receivables Face value	419,905	414,893
Long-term loans and receivables Allowance for doubtful accounts	0	0
Long-term loans and receivables Present value discount	(35,197)	(38,659)
Long-term loans and receivables	384,708	376,234
Loans for housing
Loans and Leases Receivable Disclosure [Line Items]
Short-term loans and receivables Face value	17,113	15,572
Short-term loans and receivables Allowance for doubtful accounts	0	0
Short-term loans and receivables Present value discount	0	0
Short-term loans and receivables	17,113	15,572
Long-term loans and receivables Face value	199,454	167,723
Long-term loans and receivables Allowance for doubtful accounts	0	0
Long-term loans and receivables Present value discount	0	0
Long-term loans and receivables	199,454	167,723
Loans for related parties
Loans and Leases Receivable Disclosure [Line Items]
Short-term loans and receivables Face value	0	0
Short-term loans and receivables Allowance for doubtful accounts	0	0
Short-term loans and receivables Present value discount	0	0
Short-term loans and receivables	0	0
Long-term loans and receivables Face value	89,132	46,798
Long-term loans and receivables Allowance for doubtful accounts	(4,930)	(4,930)
Long-term loans and receivables Present value discount	0	0
Long-term loans and receivables	84,202	41,868
Fisheries loan
Loans and Leases Receivable Disclosure [Line Items]
Short-term loans and receivables Face value	0	320
Short-term loans and receivables Allowance for doubtful accounts	0	0
Short-term loans and receivables Present value discount	0	0
Short-term loans and receivables	0	320
Long-term loans and receivables Face value	17,264	640
Long-term loans and receivables Allowance for doubtful accounts	(10,133)	0
Long-term loans and receivables Present value discount	(21)	(53)
Long-term loans and receivables	7,110	587
Other loans
Loans and Leases Receivable Disclosure [Line Items]
Short-term loans and receivables Face value	13,362	74,432
Short-term loans and receivables Allowance for doubtful accounts	(31)	(12)
Short-term loans and receivables Present value discount	0	0
Short-term loans and receivables	13,331	74,420
Long-term loans and receivables Face value	0	9,619
Long-term loans and receivables Allowance for doubtful accounts	0	(10)
Long-term loans and receivables Present value discount	0	0
Long-term loans and receivables	₩ 0	₩ 9,609

Other-Financial Assets _ Change

Other-Financial Assets : Changes in the allowance for doubtful accounts of Loans and receivables (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for doubtful accounts [Abstract]
Beginning balance	₩ 4,952	₩ 8,948	₩ 4,532
Bad debt expense	10,142	22	2,465
Other	0	(4,018)	1,951
Ending balance	₩ 15,094	₩ 4,952	₩ 8,948

Long-term and short-term financ

Long-term and short-term financial instruments (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2019	Dec. 31, 2018
Short-term financial instruments
Long / short-term financial instruments [Line Items]
Time deposits	₩ 1,034,971	₩ 1,602,285
CP	40,000	0
CD	15,000	10,000
RP	40,000	0
Others	222,000	257,001
Long / short-term financial instruments	1,351,971	1,869,286
Long-term financial instruments
Long / short-term financial instruments [Line Items]
Time deposits	257,857	63,358
CP	0	0
CD	0	0
RP	0	0
Others	350,399	385,383
Long / short-term financial instruments	₩ 608,256	₩ 448,741

Inventories (Details)

Inventories (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2019	Dec. 31, 2018
Inventory [Line Items]
Raw materials	₩ 3,789,013	₩ 3,884,130
Merchandise	340
Work-in-progress	165,073	188,879
Finished goods	58,280	50,526
Supplies	2,116,994	1,854,844
Inventories in transit	906,267	1,196,113
Other inventories	14,733	13,761
Total Inventories	7,050,700	7,188,253
Acquisition cost
Inventory [Line Items]
Raw materials	3,790,443	3,886,739
Merchandise	340
Work-in-progress	165,073	189,907
Finished goods	58,280	50,526
Supplies	2,121,363	1,858,751
Inventories in transit	906,267	1,196,113
Other inventories	14,733	13,761
Total Inventories	7,056,499	7,195,797
Valuation allowance
Inventory [Line Items]
Raw materials	(1,430)	(2,609)
Work-in-progress		(1,028)
Finished goods		0
Supplies	(4,369)	(3,907)
Inventories in transit		0
Other inventories		0
Total Inventories	₩ (5,799)	₩ (7,544)

Non-Financial Assets (Details)

Non-Financial Assets (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2019	Dec. 31, 2018
Other Current Assets
Non-Financial Assets [Line Items]
Advance payment		₩ 147,784	₩ 156,073
Prepaid Expense	[1]	308,017	290,944
Miscellaneous Non-Financial Assets
Greenhouse gas emissions rights		437,562	93,749
Other quick assets	[2]	313,014	338,122
Miscellaneous Non-Financial Assets	[3]	750,576	431,871
Non-Financial Assets		1,206,377	878,888
Other Noncurrent Assets
Non-Financial Assets [Line Items]
Advance payment		2,694	160,628
Prepaid Expense	[1]	84,421	90,449
Miscellaneous Non-Financial Assets
Greenhouse gas emissions rights		0	0
Other quick assets	[2]	79,814	76,075
Miscellaneous Non-Financial Assets	[3]	79,814	76,075
Non-Financial Assets		₩ 166,929	₩ 327,152
[1]	Prepaid expenses of W4,353 million as of December 31, 2018 was recorded as right-of-assets as of December 31, 2019 due to change in accounting policy.
[2]	The Company recognized W92,128 million of its rights in connection with the securities of Orano Expansion as non-current non-financial assets as of December 31, 2018. The Company recognized an impairment loss of W87,023 million as it was determined that there is objective evidence of impairment related to its rights to equity interest in and loans to Orano Expansion for the year ended December 31, 2018. In addition, during the current year, the Company converted its loans with Orano Expansion into equity. The Company recognized an impairment loss of W49,201 million as it was determined that there is objective evidence of impairment related to the rights of equity interest in Orano Expansion.
[3]	Details of others as of December 31, 2018 and 2019 are as follows:

Consolidated subsidiaries (Deta

Consolidated subsidiaries (Details)		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Korea Hydro & Nuclear Power
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Country of incorporation of subsidiary		KOREA	KOREA
Proportion of ownership interest in subsidiary		100.00%	100.00%
Korea South-East Power
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Country of incorporation of subsidiary		KOREA	KOREA
Proportion of ownership interest in subsidiary		100.00%	100.00%
Korea Midland Power
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Country of incorporation of subsidiary		KOREA	KOREA
Proportion of ownership interest in subsidiary		100.00%	100.00%
Korea Western Power
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Country of incorporation of subsidiary		KOREA	KOREA
Proportion of ownership interest in subsidiary		100.00%	100.00%
Korea Southern Power
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Country of incorporation of subsidiary		KOREA	KOREA
Proportion of ownership interest in subsidiary		100.00%	100.00%
Korea East-West Power
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Country of incorporation of subsidiary		KOREA	KOREA
Proportion of ownership interest in subsidiary		100.00%	100.00%
KEPCO Engineering & Construction Company
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities	[1]	Architectural engineering for utility plant and others	Architectural engineering for utility plant and others
Country of incorporation of subsidiary	[1]	KOREA	KOREA
Proportion of ownership interest in subsidiary	[1]	65.77%	65.77%
KEPCO Plant Service & Engineering
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Utility plant maintenance and others	Utility plant maintenance and others
Country of incorporation of subsidiary		KOREA	KOREA
Proportion of ownership interest in subsidiary		51.00%	51.00%
KEPCO Nuclear Fuel
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Nuclear fuel	Nuclear fuel
Country of incorporation of subsidiary		KOREA	KOREA
Proportion of ownership interest in subsidiary		96.36%	96.36%
KEPCO KDN
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Electric power information technology and others	Electric power information technology and others
Country of incorporation of subsidiary		KOREA	KOREA
Proportion of ownership interest in subsidiary		100.00%	100.00%
Garolim Tidal Power Plant
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities	[2]	Power generation	Power generation
Country of incorporation of subsidiary	[2]	KOREA	KOREA
Proportion of ownership interest in subsidiary	[2]	0.00%	49.00%
Reason	[2]	Under Liquidation Process
KEPCO International HongKong
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Country of incorporation of subsidiary		HONG KONG	HONG KONG
Proportion of ownership interest in subsidiary		100.00%	100.00%
KEPCO International Philippines
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Country of incorporation of subsidiary		PHILIPPINES	PHILIPPINES
Proportion of ownership interest in subsidiary		100.00%	100.00%
KEPCO Gansu International
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Country of incorporation of subsidiary		HONG KONG	HONG KONG
Proportion of ownership interest in subsidiary		100.00%	100.00%
KEPCO Philippines Holdings
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Country of incorporation of subsidiary		PHILIPPINES	PHILIPPINES
Proportion of ownership interest in subsidiary		100.00%	100.00%
KEPCO Philippines Corporation
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Operation of utility plant	Operation of utility plant
Country of incorporation of subsidiary		PHILIPPINES	PHILIPPINES
Proportion of ownership interest in subsidiary		100.00%	100.00%
KEPCO Ilijan Corporation
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Construction and operation of utility plant	Construction and operation of utility plant
Country of incorporation of subsidiary		PHILIPPINES	PHILIPPINES
Proportion of ownership interest in subsidiary		51.00%	51.00%
KEPCO Lebanon SARL
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Operation of utility plant	Operation of utility plant
Country of incorporation of subsidiary		LEBANON	LEBANON
Proportion of ownership interest in subsidiary		100.00%	100.00%
KEPCO Neimenggu International
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Country of incorporation of subsidiary		HONG KONG	HONG KONG
Proportion of ownership interest in subsidiary		100.00%	100.00%
KEPCO Shanxi International
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Country of incorporation of subsidiary		HONG KONG	HONG KONG
Proportion of ownership interest in subsidiary		100.00%	100.00%
KOMIPO Global Pte
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Country of incorporation of subsidiary		SINGAPORE	SINGAPORE
Proportion of ownership interest in subsidiary		100.00%	100.00%
KEPCO Netherlands B.V.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Country of incorporation of subsidiary		NETHERLANDS	NETHERLANDS
Proportion of ownership interest in subsidiary		100.00%	100.00%
KOREA Imouraren Uranium Investment Corp.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Country of incorporation of subsidiary		FRANCE	FRANCE
Proportion of ownership interest in subsidiary		100.00%	100.00%
KEPCO Australia
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Resources development	Resources development
Country of incorporation of subsidiary		AUSTRALIA	AUSTRALIA
Proportion of ownership interest in subsidiary		100.00%	100.00%
KOSEP Australia
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Resources development	Resources development
Country of incorporation of subsidiary		AUSTRALIA	AUSTRALIA
Proportion of ownership interest in subsidiary		100.00%	100.00%
KOMIPO Australia
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Resources development	Resources development
Country of incorporation of subsidiary		AUSTRALIA	AUSTRALIA
Proportion of ownership interest in subsidiary		100.00%	100.00%
KOWEPO Australia
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Resources development	Resources development
Country of incorporation of subsidiary		AUSTRALIA	AUSTRALIA
Proportion of ownership interest in subsidiary		100.00%	100.00%
KOSPO Australia
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Resources development	Resources development
Country of incorporation of subsidiary		AUSTRALIA	AUSTRALIA
Proportion of ownership interest in subsidiary		100.00%	100.00%
KEPCO Middle East Holding Company
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Country of incorporation of subsidiary		BAHRAIN	BAHRAIN
Proportion of ownership interest in subsidiary		100.00%	100.00%
Qatrana Electric Power Company
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Construction and operation of utility plant	Construction and operation of utility plant
Country of incorporation of subsidiary		JORDAN	JORDAN
Proportion of ownership interest in subsidiary		80.00%	80.00%
KHNP Canada Energy
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Country of incorporation of subsidiary		CANADA	CANADA
Proportion of ownership interest in subsidiary		100.00%	100.00%
KEPCO Bylong Australia
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Resources development	Resources development
Country of incorporation of subsidiary		AUSTRALIA	AUSTRALIA
Proportion of ownership interest in subsidiary		100.00%	100.00%
Korea Waterbury Uranium Limited Partnership
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Resources development	Resources development
Country of incorporation of subsidiary		CANADA	CANADA
Proportion of ownership interest in subsidiary		80.00%	80.00%
Korea Electric Power Nigeria
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities	[3]	Operation of utility plant	Operation of utility plant
Country of incorporation of subsidiary	[3]	NIGERIA	NIGERIA
Proportion of ownership interest in subsidiary	[3]	0.00%	100.00%
Reason	[3]	Liquidated
KEPCO Holdings de Mexico
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Country of incorporation of subsidiary		MEXICO	MEXICO
Proportion of ownership interest in subsidiary		100.00%	100.00%
KST Electric Power Company
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Construction and operation of utility plant	Construction and operation of utility plant
Country of incorporation of subsidiary		MEXICO	MEXICO
Proportion of ownership interest in subsidiary		56.00%	56.00%
KEPCO Energy Service Company
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Operation of utility plant	Operation of utility plant
Country of incorporation of subsidiary		MEXICO	MEXICO
Proportion of ownership interest in subsidiary		100.00%	100.00%
KEPCO Netherlands S3 B.V.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Country of incorporation of subsidiary		NETHERLANDS	NETHERLANDS
Proportion of ownership interest in subsidiary		100.00%	100.00%
PT. KOMIPO Pembangkitan Jawa Bali
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Operation of utility plant	Operation of utility plant
Country of incorporation of subsidiary		INDONESIA	INDONESIA
Proportion of ownership interest in subsidiary		51.00%	51.00%
PT. Cirebon Power Service
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities	[4]	Operation of utility plant	Operation of utility plant
Country of incorporation of subsidiary	[4]	INDONESIA	INDONESIA
Proportion of ownership interest in subsidiary	[4]	27.50%	27.50%
KOWEPO International Corporation
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Operation of utility plant	Operation of utility plant
Country of incorporation of subsidiary		PHILIPPINES	PHILIPPINES
Proportion of ownership interest in subsidiary		99.99%	99.99%
KOSPO Jordan
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Operation of utility plant	Operation of utility plant
Country of incorporation of subsidiary		JORDAN	JORDAN
Proportion of ownership interest in subsidiary		100.00%	100.00%
EWP Philippines Corporation
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Country of incorporation of subsidiary		PHILIPPINES	PHILIPPINES
Proportion of ownership interest in subsidiary		100.00%	100.00%
EWP America
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Country of incorporation of subsidiary		USA	USA
Proportion of ownership interest in subsidiary		100.00%	100.00%
EWP Renewable
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Country of incorporation of subsidiary		USA	USA
Proportion of ownership interest in subsidiary		100.00%	100.00%
DG Fairhaven Power
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Country of incorporation of subsidiary		USA	USA
Proportion of ownership interest in subsidiary		100.00%	100.00%
DG Whitefield
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Country of incorporation of subsidiary		USA	USA
Proportion of ownership interest in subsidiary		100.00%	100.00%
Springfield Power
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Country of incorporation of subsidiary		USA	USA
Proportion of ownership interest in subsidiary		100.00%	100.00%
KNF Canada Energy Limited
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Country of incorporation of subsidiary		CANADA	CANADA
Proportion of ownership interest in subsidiary		100.00%	100.00%
EWP Barbados 1 SRL
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Country of incorporation of subsidiary		BARBADOS	BARBADOS
Proportion of ownership interest in subsidiary		100.00%	100.00%
California Power Holdings
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Country of incorporation of subsidiary		USA	USA
Proportion of ownership interest in subsidiary		100.00%	100.00%
Gyeonggi Green Energy
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Country of incorporation of subsidiary		KOREA	KOREA
Proportion of ownership interest in subsidiary		62.01%	62.01%
PT. Tanggamus Electric Power
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Country of incorporation of subsidiary		INDONESIA	INDONESIA
Proportion of ownership interest in subsidiary		52.50%	52.50%
Gyeongju Wind Power
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Country of incorporation of subsidiary		KOREA	KOREA
Proportion of ownership interest in subsidiary		70.00%	70.00%
KOMIPO America
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Country of incorporation of subsidiary		USA	USA
Proportion of ownership interest in subsidiary		100.00%	100.00%
EWPRC Biomass Holdings
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Country of incorporation of subsidiary		USA	USA
Proportion of ownership interest in subsidiary		100.00%	100.00%
KOSEP USA INC.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Country of incorporation of subsidiary		USA	USA
Proportion of ownership interest in subsidiary		100.00%	100.00%
PT. EWP Indonesia
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Country of incorporation of subsidiary		INDONESIA	INDONESIA
Proportion of ownership interest in subsidiary		99.96%	99.96%
KEPCO Netherlands J3 B.V.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Country of incorporation of subsidiary		NETHERLANDS	NETHERLANDS
Proportion of ownership interest in subsidiary		100.00%	100.00%
Korea Offshore Wind Power B.V.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Country of incorporation of subsidiary		KOREA	KOREA
Proportion of ownership interest in subsidiary		100.00%	100.00%
Global One Pioneer B.V.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Country of incorporation of subsidiary		NETHERLANDS	NETHERLANDS
Proportion of ownership interest in subsidiary		100.00%	100.00%
Global Energy Pioneer B.V.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Country of incorporation of subsidiary		NETHERLANDS	NETHERLANDS
Proportion of ownership interest in subsidiary		100.00%	100.00%
Mira Power Limited
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities	[5]	Power generation	Power generation
Country of incorporation of subsidiary	[5]	PAKISTAN	PAKISTAN
Proportion of ownership interest in subsidiary	[5]	76.00%	76.00%
KOSEP Material
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Recycling fly ashes	Recycling fly ashes
Country of incorporation of subsidiary		KOREA	KOREA
Proportion of ownership interest in subsidiary		86.22%	86.22%
Commerce and Industry Energy
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities	[6]	Power generation	Power generation
Country of incorporation of subsidiary	[6]	KOREA	KOREA
Proportion of ownership interest in subsidiary	[6]	85.00%	59.03%
KEPCO Singapore Holdings Pte.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities	[3]	Holding company	Holding company
Country of incorporation of subsidiary	[3]	SINGAPORE	SINGAPORE
Proportion of ownership interest in subsidiary	[3]	0.00%	100.00%
Reason	[3]	Liquidated
KEPCO KPS Philippines Corp.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Utility plant maintenance and others	Utility plant maintenance and others
Country of incorporation of subsidiary		PHILIPPINES	PHILIPPINES
Proportion of ownership interest in subsidiary		99.99%	99.99%
KOSPO Chile SpA
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Country of incorporation of subsidiary		CHILE	CHILE
Proportion of ownership interest in subsidiary		100.00%	100.00%
PT. KOWEPO Sumsel Operation and Maintenance Services
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Utility plant maintenance and others	Utility plant maintenance and others
Country of incorporation of subsidiary		INDONESIA	INDONESIA
Proportion of ownership interest in subsidiary		95.00%	95.00%
HeeMang Sunlight Power
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Operation of utility plant	Operation of utility plant
Country of incorporation of subsidiary		KOREA	KOREA
Proportion of ownership interest in subsidiary		100.00%	100.00%
Fujeij Wind Power Company
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Operation of utility plant	Operation of utility plant
Country of incorporation of subsidiary		JORDAN	JORDAN
Proportion of ownership interest in subsidiary		100.00%	100.00%
KOSPO Youngnam Power
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Operation of utility plant	Operation of utility plant
Country of incorporation of subsidiary		KOREA	KOREA
Proportion of ownership interest in subsidiary		50.00%	50.00%
VI Carbon Professional Private Special Asset Investment Trust 1 (formally, HI Carbon Professional Private Special Asset)
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Country of incorporation of subsidiary		KOREA	KOREA
Proportion of ownership interest in subsidiary		96.67%	96.67%
Chitose Solar Power Plant LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Country of incorporation of subsidiary		JAPAN	JAPAN
Proportion of ownership interest in subsidiary		80.10%	80.10%
KEPCO Energy Solution
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Energy service	Energy service
Country of incorporation of subsidiary		KOREA	KOREA
Proportion of ownership interest in subsidiary		100.00%	100.00%
Solar School Plant
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Country of incorporation of subsidiary		KOREA	KOREA
Proportion of ownership interest in subsidiary		100.00%	100.00%
KOSPO Power Services Limitada
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Utility plant maintenance and others	Utility plant maintenance and others
Country of incorporation of subsidiary		CHILE	CHILE
Proportion of ownership interest in subsidiary		65.00%	65.00%
Energy New Industry Specialized Investment Private Investment Trust
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Country of incorporation of subsidiary		KOREA	KOREA
Proportion of ownership interest in subsidiary		99.01%	99.01%
KOEN Bylong
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Resources development	Resources development
Country of incorporation of subsidiary		AUSTRALIA	AUSTRALIA
Proportion of ownership interest in subsidiary		100.00%	100.00%
KOMIPO Bylong
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Resources development	Resources development
Country of incorporation of subsidiary		AUSTRALIA	AUSTRALIA
Proportion of ownership interest in subsidiary		100.00%	100.00%
KOWEPO Bylong
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Resources development	Resources development
Country of incorporation of subsidiary		AUSTRALIA	AUSTRALIA
Proportion of ownership interest in subsidiary		100.00%	100.00%
KOSPO Bylong
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Resources development	Resources development
Country of incorporation of subsidiary		AUSTRALIA	AUSTRALIA
Proportion of ownership interest in subsidiary		100.00%	100.00%
EWP Bylong
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Resources development	Resources development
Country of incorporation of subsidiary		AUSTRALIA	AUSTRALIA
Proportion of ownership interest in subsidiary		100.00%	100.00%
KOWEPO Lao International
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Utility plant maintenance and others	Utility plant maintenance and others
Country of incorporation of subsidiary		LAOS	LAOS
Proportion of ownership interest in subsidiary		100.00%	100.00%
KEPCO US
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Country of incorporation of subsidiary		USA	USA
Proportion of ownership interest in subsidiary		100.00%	100.00%
KEPCO Alamosa
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Country of incorporation of subsidiary		USA	USA
Proportion of ownership interest in subsidiary		50.10%	50.10%
KEPCO Solar of Alamosa, LLC (formerly, Cogentrix of Alamosa, LLC)
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Country of incorporation of subsidiary		USA	USA
Proportion of ownership interest in subsidiary		100.00%	100.00%
KEPCO-LG CNS Mangilao Holdings
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Country of incorporation of subsidiary		USA	USA
Proportion of ownership interest in subsidiary		70.00%	70.00%
Mangilao Investment
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Country of incorporation of subsidiary		USA	USA
Proportion of ownership interest in subsidiary		100.00%	100.00%
KEPCO-LG CNS Mangilao Solar
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities	[7]	Power generation	Power generation
Country of incorporation of subsidiary	[7]	USA	USA
Proportion of ownership interest in subsidiary	[7]	100.00%	100.00%
Jeju Hanlim Offshore Wind Co
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Country of incorporation of subsidiary		KOREA	KOREA
Proportion of ownership interest in subsidiary		75.99%	75.99%
PT. Siborpa Eco Power
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Construction and operation of utility plant	Construction and operation of utility plant
Country of incorporation of subsidiary		INDONESIA	INDONESIA
Proportion of ownership interest in subsidiary		55.00%	55.00%
BSK E-New Industry Fund VII
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Country of incorporation of subsidiary		KOREA	KOREA
Proportion of ownership interest in subsidiary		81.67%	81.67%
e-New Industry LB Fund 1
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Country of incorporation of subsidiary		KOREA	KOREA
Proportion of ownership interest in subsidiary		76.11%	76.11%
Songhyun e-New Industry Fund
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Country of incorporation of subsidiary		KOREA	KOREA
Proportion of ownership interest in subsidiary		80.65%	80.65%
PT. Korea Energy Indonesia
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Utility plant maintenance and others	Utility plant maintenance
Country of incorporation of subsidiary		INDONESIA	INDONESIA
Proportion of ownership interest in subsidiary		95.00%	95.00%
KOLAT SpA
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Utility plant maintenance and others	Utility plant maintenance and others
Country of incorporation of subsidiary		CHILE	CHILE
Proportion of ownership interest in subsidiary		100.00%	100.00%
KEPCO California, LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Country of incorporation of subsidiary		USA	USA
Proportion of ownership interest in subsidiary		100.00%	100.00%
KEPCO Mojave Holdings, LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Country of incorporation of subsidiary		USA	USA
Proportion of ownership interest in subsidiary		100.00%	100.00%
Incheon Fuel Cell Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Country of incorporation of subsidiary		KOREA	KOREA
Proportion of ownership interest in subsidiary		60.00%	60.00%
KOEN Service Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Facility maintenance and service	Facility maintenance and service
Country of incorporation of subsidiary		KOREA	KOREA
Proportion of ownership interest in subsidiary		100.00%	100.00%
KOMIPO Service Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Facility maintenance and service	Facility maintenance and service
Country of incorporation of subsidiary		KOREA	KOREA
Proportion of ownership interest in subsidiary		100.00%	100.00%
KOWEPO Service Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Facility maintenance and service	Facility maintenance and service
Country of incorporation of subsidiary		KOREA	KOREA
Proportion of ownership interest in subsidiary		100.00%	100.00%
KOSPO Service Co., Ltd
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Facility maintenance and service	Facility maintenance and service
Country of incorporation of subsidiary		KOREA	KOREA
Proportion of ownership interest in subsidiary		100.00%	100.00%
EWP Service Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Facility maintenance and service	Facility maintenance and service
Country of incorporation of subsidiary		KOREA	KOREA
Proportion of ownership interest in subsidiary		100.00%	100.00%
PT. KOMIPO Energy Indonesia
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Utility plant maintenance and others	Utility plant maintenance and others
Country of incorporation of subsidiary		INDONESIA	INDONESIA
Proportion of ownership interest in subsidiary		95.00%	95.00%
KNF Partners Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Facility maintenance
Country of incorporation of subsidiary		KOREA
Proportion of ownership interest in subsidiary		100.00%
Reason		Newly Established
KOSPO USA Inc.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company
Country of incorporation of subsidiary		USA
Proportion of ownership interest in subsidiary		100.00%
Reason		Newly Established
Nambu USA LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company
Country of incorporation of subsidiary		USA
Proportion of ownership interest in subsidiary		100.00%
Reason		Newly Established
Tamra Offshore Wind Power Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities	[8]	Power generation
Country of incorporation of subsidiary	[8]	KOREA
Proportion of ownership interest in subsidiary	[8]	63.00%
Reason	[8]	Additional acquisition
KEPCO MCS Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Electric meter reading and others
Country of incorporation of subsidiary		KOREA
Proportion of ownership interest in subsidiary		100.00%
Reason		Newly Established
KEPCO FMS Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Security service and others
Country of incorporation of subsidiary		KOREA
Proportion of ownership interest in subsidiary		100.00%
Reason		Newly Established
Firstkeepers Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Facility maintenance
Country of incorporation of subsidiary		KOREA
Proportion of ownership interest in subsidiary		100.00%
Reason		Newly Established
Secutec Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Security service
Country of incorporation of subsidiary		KOREA
Proportion of ownership interest in subsidiary		100.00%
Reason		Newly Established
SE Green Energy Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities	[8]	Power generation
Country of incorporation of subsidiary	[8]	KOREA
Proportion of ownership interest in subsidiary	[8]	84.80%
Reason	[8]	Additional acquisition
KEPCO Mangilao America LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company
Country of incorporation of subsidiary		USA
Proportion of ownership interest in subsidiary		100.00%
Reason		Newly Established
Mangilao Intermediate Holdings LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company
Country of incorporation of subsidiary		USA
Proportion of ownership interest in subsidiary		100.00%
Reason		Newly Established
KEPCO CSC Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Facility maintenance
Country of incorporation of subsidiary		KOREA
Proportion of ownership interest in subsidiary		100.00%
Reason		Newly Established
KOAK Power Limited
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Facility maintenance
Country of incorporation of subsidiary		PARKISTAN
Proportion of ownership interest in subsidiary		100.00%
Reason		Newly Established
KOMIPO Europe B.V.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company
Country of incorporation of subsidiary		SWEDEN
Proportion of ownership interest in subsidiary		100.00%
Reason		Newly Established
Haenanum Energy Fund
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company
Country of incorporation of subsidiary		KOREA
Proportion of ownership interest in subsidiary		99.64%
Reason		Newly Established
Paju Ecoenergy Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation
Country of incorporation of subsidiary		KOREA
Proportion of ownership interest in subsidiary		89.00%
Reason		Newly Established
[1]	Considering treasury stocks, the effective percentage of ownership is 66.08%.
[2]	The liquidation process is in progress by the appointment of a liquidator, and the Company has been reclassified the invested amount as assets held for sale as of December 31, 2019.
[3]	The liquidation process has been completed during the year ended December 31, 2019.
[4]	The effective percentage of ownership is less than 50%. However, this subsidiary is included in the consolidated financial statements as the Company obtained the majority of the voting power through the shareholders' agreement.
[5]	As of the reporting date, the annual reporting period of all subsidiaries is December 31, except for Mira Power Limited which is November 30.
[6]	The Company guarantees a certain return on investment related to Commerce and Industry Energy Co., Ltd. for the financial investors. The financial investors have a right to sell their shares to the Company which can be exercised 84 months after the date of investment. Accordingly, the purchase price including the return on investment is classified as a liability.
[7]	The Company does not hold a stake, but it is included in subsidiaries because the Company has control over KEPCO-LG CNS Mangilao Holdings LLC with nomination rights among 4 out of 6 board members.
[8]	The entity was reclassified from an associate to a subsidiary due to additional acquisition of interest during the year ended December 31, 2019.

Summary of financial informatio

Summary of financial information of consolidated subsidiaries (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Korea Hydro & Nuclear Power
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		₩ 59,570,219	₩ 55,792,704
Total liabilities		33,917,275	30,484,104
Sales		8,969,072	8,858,717
Profit (loss) for the period		306,007	(137,613)
Korea South-East Power
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		10,938,358	9,997,758
Total liabilities		5,866,642	4,948,553
Sales		5,385,387	5,521,038
Profit (loss) for the period		41,006	25,736
Korea Midland Power
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		12,684,828	10,839,218
Total liabilities		8,977,766	7,088,013
Sales		4,479,707	4,368,467
Profit (loss) for the period		(28,449)	(38,142)
Korea Western Power
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		10,514,438	9,902,752
Total liabilities		6,637,451	5,965,410
Sales		4,448,992	4,841,261
Profit (loss) for the period		(46,061)	(28,157)
Korea Southern Power
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		10,884,799	9,810,985
Total liabilities		6,608,301	5,463,721
Sales		5,084,907	5,539,793
Profit (loss) for the period		(41,342)	55,439
Korea East-West Power
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		9,724,311	8,744,380
Total liabilities		5,022,921	4,092,460
Sales		4,855,964	4,933,525
Profit (loss) for the period		56,698	3,345
KEPCO Engineering & Construction Company
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		735,207	771,480
Total liabilities		242,994	310,100
Sales		448,635	433,701
Profit (loss) for the period		26,398	12,937
KEPCO Plant Service & Engineering
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		1,356,983	1,275,365
Total liabilities		294,757	296,428
Sales		1,244,613	1,239,604
Profit (loss) for the period		157,737	160,791
KEPCO Nuclear Fuel
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		831,604	817,416
Total liabilities		429,799	434,439
Sales		309,055	230,667
Profit (loss) for the period		24,618	15,835
KEPCO KDN
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		604,458	566,807
Total liabilities		159,807	159,423
Sales		625,567	622,154
Profit (loss) for the period		42,205	60,016
Garolim Tidal Power Plant
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets			608
Total liabilities			345
Sales			0
Profit (loss) for the period			(11)
KEPCO International HongKong
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		138,942	140,101
Total liabilities		633	1
Sales		0	0
Profit (loss) for the period		3,330	3,307
KEPCO International Philippines
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		107,224	107,948
Total liabilities		371	1,475
Sales		0	0
Profit (loss) for the period		67,991	52,539
KEPCO Gansu International
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		10,448	12,047
Total liabilities		545	515
Sales		0	0
Profit (loss) for the period		(20)	(24)
KEPCO Philippines Holdings
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		200,503	188,551
Total liabilities		6,656	9,775
Sales		0	0
Profit (loss) for the period		66,200	53,219
KEPCO Philippines Corporation
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		6,706	6,394
Total liabilities		332	213
Sales		0	0
Profit (loss) for the period		(52)	54
KEPCO Ilijan Corporation
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		371,377	431,444
Total liabilities		56,156	53,413
Sales		95,072	99,844
Profit (loss) for the period		40,818	49,631
KEPCO Lebanon SARL
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		1,835	1,509
Total liabilities		9,786	9,686
Sales		0	0
Profit (loss) for the period		255	413
KEPCO Neimenggu International
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		200,858	194,336
Total liabilities		0	0
Sales		0	0
Profit (loss) for the period		(354)	20,829
KEPCO Shanxi International
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		538,604	519,991
Total liabilities		208,895	201,732
Sales		0	0
Profit (loss) for the period		151	290
KOMIPO Global Pte
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		269,302	250,456
Total liabilities		463	961
Sales		0	0
Profit (loss) for the period		10,400	11,478
KEPCO Netherlands B.V.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		122,577	130,460
Total liabilities		101	77
Sales		0	0
Profit (loss) for the period		948	26,550
KOREA Imouraren Uranium Investment Corp.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		14,173	63,517
Total liabilities		111	171
Sales		0	0
Profit (loss) for the period		(49,716)	(89,852)
KEPCO Australia
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		364	439,719
Total liabilities		14	14
Sales		0	0
Profit (loss) for the period		(395,914)	49
KOSEP Australia
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		32,782	37,057
Total liabilities		2,911	2,832
Sales		15,514	20,294
Profit (loss) for the period		3,935	7,315
KOMIPO Australia
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		40,898	39,066
Total liabilities		2,909	4,659
Sales		15,514	20,294
Profit (loss) for the period		3,766	7,193
KOWEPO Australia
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		44,182	39,341
Total liabilities		5,772	4,702
Sales		15,514	20,294
Profit (loss) for the period		2,761	7,316
KOSPO Australia
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		37,254	36,525
Total liabilities		5,012	3,585
Sales		15,514	20,294
Profit (loss) for the period		2,638	9,520
KEPCO Middle East Holding Company
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		102,164	101,201
Total liabilities		87,834	92,862
Sales		0	0
Profit (loss) for the period		5,934	3,043
Qatrana Electric Power Company
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		490,723	484,383
Total liabilities		322,857	326,486
Sales		20,773	18,766
Profit (loss) for the period		21,807	21,170
KHNP Canada Energy
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		44,639	49,776
Total liabilities		43	35
Sales		0	0
Profit (loss) for the period		(10)	(26)
KEPCO Bylong Australia
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		45,207	254,398
Total liabilities		355,163	315,921
Sales		0	0
Profit (loss) for the period		(220,909)	(29,573)
Korea Waterbury Uranium Limited Partnership
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		20,717	20,890
Total liabilities		167	142
Sales		0	0
Profit (loss) for the period		(77)	(74)
Korea Electric Power Nigeria
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets			112
Total liabilities			39
Sales			727
Profit (loss) for the period			(93)
KEPCO Holdings de Mexico
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		187	248
Total liabilities		25	57
Sales		0	0
Profit (loss) for the period		(14)	(11)
KST Electric Power Company
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		539,952	535,807
Total liabilities		449,459	457,867
Sales		55,783	109,735
Profit (loss) for the period		(20,797)	10,274
KEPCO Energy Service Company
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		2,262	1,940
Total liabilities		1,995	1,454
Sales		5,984	5,117
Profit (loss) for the period		(481)	(232)
KEPCO Netherlands S3 B.V.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		50,352	46,642
Total liabilities		49	53
Sales		0	0
Profit (loss) for the period		2,637	2,382
PT. KOMIPO Pembangkitan Jawa Bali
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		12,391	11,405
Total liabilities		5,719	5,472
Sales		18,722	20,320
Profit (loss) for the period		4,312	3,925
PT. Cirebon Power Service
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		2,089	1,588
Total liabilities		313	273
Sales		8,049	7,228
Profit (loss) for the period		406	177
KOWEPO International Corporation
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		0	0
Total liabilities		10	8
Sales		0	0
Profit (loss) for the period		(2)	0
KOSPO Jordan
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		17,489	16,315
Total liabilities		1,521	3,432
Sales		10,878	34,371
Profit (loss) for the period		2,634	1,907
EWP Philippines Corporation
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		1,691	1,684
Total liabilities		888	829
Sales		0	0
Profit (loss) for the period		(111)	(11)
EWP America
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	[1]	66,622	72,525
Total liabilities	[1]	2,619	4,903
Sales	[1]	21,719	29,557
Profit (loss) for the period	[1]	(6,497)	(4,483)
KNF Canada Energy Limited
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		1,933	1,801
Total liabilities		24	20
Sales		0	0
Profit (loss) for the period		(48)	(45)
EWP Barbados 1 SRL
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		279,295	268,033
Total liabilities		1,031	1,581
Sales		2,914	688
Profit (loss) for the period		2,368	11,221
Gyeonggi Green Energy
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		194,425	293,812
Total liabilities		159,078	185,043
Sales		13,717	96,442
Profit (loss) for the period		(73,394)	25,121
PT. Tanggamus Electric Power
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		228,601	216,321
Total liabilities		195,826	187,502
Sales		2,256	26,832
Profit (loss) for the period		(4,529)	9,338
Gyeongju Wind Power
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		113,745	122,303
Total liabilities		75,427	83,348
Sales		15,548	21,906
Profit (loss) for the period		3,384	8,803
KOMIPO America
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		9,424	10,092
Total liabilities		593	572
Sales		118	0
Profit (loss) for the period		(1,033)	(885)
KOSEP USA INC.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		1	1
Total liabilities		5,147	4,857
Sales		0	0
Profit (loss) for the period		(119)	4,341
PT. EWP Indonesia
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		34,455	7,444
Total liabilities		5	14
Sales		0	0
Profit (loss) for the period		5,124	3,138
KEPCO Netherlands J3 B.V.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		120,006	115,978
Total liabilities		74	77
Sales		0	0
Profit (loss) for the period		(79)	(104)
Korea Offshore Wind Power B.V.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		284,495	216,114
Total liabilities		117,527	36,377
Sales		0	0
Profit (loss) for the period		(12,768)	(8,473)
Global One Pioneer B.V.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		180	162
Total liabilities		73	87
Sales		0	0
Profit (loss) for the period		(86)	(113)
Global Energy Pioneer B.V.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		348	325
Total liabilities		80	74
Sales		0	0
Profit (loss) for the period		(90)	(102)
Mira Power Limited
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		356,111	277,525
Total liabilities		285,577	213,104
Sales		0	0
Profit (loss) for the period		(971)	(980)
KOSEP Material
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		2,788	2,862
Total liabilities		1,186	1,249
Sales		3,357	3,240
Profit (loss) for the period		22	377
Commerce and Industry Energy
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		90,637	92,872
Total liabilities		43,985	88,009
Sales		32,728	27,937
Profit (loss) for the period		(7,532)	(6,091)
KEPCO Singapore Holdings Pte.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets			582
Total liabilities			9
Sales			0
Profit (loss) for the period			(31)
KEPCO KPS Philippines Corp.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		5,198	7,501
Total liabilities		1,341	358
Sales		6,246	4,815
Profit (loss) for the period		2	766
KOSPO Chile SpA
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		134,827	139,814
Total liabilities		49,183	57,502
Sales		0	0
Profit (loss) for the period		(456)	1,016
PT. KOWEPO Sumsel Operation and Maintenance Services
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		135	1,313
Total liabilities		262	394
Sales		0	4,343
Profit (loss) for the period		(1,104)	(654)
HeeMang Sunlight Power
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		12,185	10,915
Total liabilities		8,545	7,626
Sales		643	146
Profit (loss) for the period		75	(192)
Fujeij Wind Power Company
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		218,333	217,796
Total liabilities		196,964	212,435
Sales		0	0
Profit (loss) for the period		5,515	(1,033)
KOSPO Youngnam Power
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		398,495	413,472
Total liabilities		307,226	325,589
Sales		318,338	369,669
Profit (loss) for the period		3,514	8,155
VI Carbon Professional Private Special Asset Investment Trust 1 (formally, HI Carbon Professional Private Special Asset)
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		3,002	3,002
Total liabilities		0	0
Sales		0	0
Profit (loss) for the period		12	12
Chitose Solar Power Plant LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		121,457	115,505
Total liabilities		106,254	105,079
Sales		17,103	15,022
Profit (loss) for the period		5,480	872
KEPCO Energy Solution
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		308,188	304,103
Total liabilities		2,142	849
Sales		2,843	5,584
Profit (loss) for the period		2,805	2,532
Solar School Plant
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		208,730	204,282
Total liabilities		3,269	1,366
Sales		1,962	1,149
Profit (loss) for the period		2,553	2,033
KOSPO Power Services Limitada
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		3,244	3,045
Total liabilities		1,564	596
Sales		10,013	9,610
Profit (loss) for the period		452	1,132
Energy New Industry Specialized Investment Private Investment Trust
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	[2]	100,116	66,498
Total liabilities	[2]	17,359	1,014
Sales	[2]	2,418	0
Profit (loss) for the period	[2]	(7,735)	(1,140)
KOEN Bylong
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		0	5,544
Total liabilities		39	26
Sales		0	0
Profit (loss) for the period		(14)	(10)
KOMIPO Bylong
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		4	5,544
Total liabilities		43	26
Sales		0	0
Profit (loss) for the period		(14)	(25)
KOWEPO Bylong
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		4	5,544
Total liabilities		40	26
Sales		0	0
Profit (loss) for the period		(12)	0
KOSPO Bylong
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		4	5,544
Total liabilities		40	26
Sales		0	0
Profit (loss) for the period		(12)	(25)
EWP Bylong
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		4	5,544
Total liabilities		40	26
Sales		0	0
Profit (loss) for the period		(12)	(15)
KOWEPO Lao International
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		5,430	3,800
Total liabilities		575	1,015
Sales		4,308	2,899
Profit (loss) for the period		1,584	895
KEPCO US
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		17,231	16,640
Total liabilities		0	0
Sales		0	0
Profit (loss) for the period		0	6
KEPCO Alamosa
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		33,515	32,346
Total liabilities		183	79
Sales		145	750
Profit (loss) for the period		(311)	(688)
KEPCO Solar of Alamosa, LLC (formerly, Cogentrix of Alamosa, LLC)
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		65,468	64,223
Total liabilities		50,348	48,819
Sales		8,739	9,015
Profit (loss) for the period		(1,902)	200
KEPCO-LG CNS Mangilao Holdings
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		27,439	25,642
Total liabilities		30,287	27,197
Sales		0	0
Profit (loss) for the period		(1,240)	(1,144)
Mangilao Investment
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		39,972	25,641
Total liabilities		0	0
Sales		0	0
Profit (loss) for the period		0	0
KEPCO-LG CNS Mangilao Solar
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		39,373	25,406
Total liabilities		11	146
Sales		0	0
Profit (loss) for the period		(524)	(104)
Jeju Hanlim Offshore Wind Co
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		14,328	16,557
Total liabilities		558	328
Sales		0	0
Profit (loss) for the period		(2,459)	(925)
PT. Siborpa Eco Power
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		11,574	12,363
Total liabilities		71	141
Sales		0	0
Profit (loss) for the period		(1,165)	(1,771)
PT. Korea Energy Indonesia
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		1,592	1,183
Total liabilities		121	60
Sales		2,462	1,459
Profit (loss) for the period		323	223
KOLAT SpA
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		31,178	38,362
Total liabilities		167	474
Sales		656	585
Profit (loss) for the period		(296)	(186)
KEPCO California, LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		44,074	42,171
Total liabilities		936	21
Sales		358	0
Profit (loss) for the period		(513)	(332)
KEPCO Mojave Holdings, LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		103,815	103,189
Total liabilities		69,544	65,730
Sales		0	0
Profit (loss) for the period		(4,215)	(3,959)
Incheon Fuel Cell Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		22,669	23,626
Total liabilities		475	415
Sales		0	0
Profit (loss) for the period		(1,010)	(201)
KOEN Service Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		5,347	583
Total liabilities		4,252	31
Sales		25,890	0
Profit (loss) for the period		543	(48)
KOMIPO Service Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		3,327	576
Total liabilities		2,622	17
Sales		24,556	0
Profit (loss) for the period		146	(41)
KOWEPO Service Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		4,228	750
Total liabilities		3,302	227
Sales		23,982	0
Profit (loss) for the period		389	(77)
KOSPO Service Co., Ltd
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		3,493	576
Total liabilities		2,788	6
Sales		18,741	0
Profit (loss) for the period		135	(30)
EWP Service Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		4,786	667
Total liabilities		4,064	97
Sales		20,837	0
Profit (loss) for the period		162	(30)
PT. KOMIPO Energy Indonesia
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		2,647	2,236
Total liabilities		196	0
Sales		1,392	0
Profit (loss) for the period		79	₩ 0
KNF Partners Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		1,378
Total liabilities		890
Sales		3,383
Profit (loss) for the period		187
KOSPO USA Inc.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		5,896
Total liabilities		127
Sales		0
Profit (loss) for the period		(1,408)
Nambu USA LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		245
Total liabilities		1
Sales		0
Profit (loss) for the period		245
Tamra Offshore Wind Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		156,708
Total liabilities		121,724
Sales		19,670
Profit (loss) for the period		1,154
KEPCO MCS Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		26,510
Total liabilities		22,151
Sales		129,393
Profit (loss) for the period		3,408
KEPCO FMS Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		11,336
Total liabilities		10,638
Sales		37,627
Profit (loss) for the period		198
Firstkeepers Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		1,552
Total liabilities		2,800
Sales		121
Profit (loss) for the period		(2,239)
Secutec Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		322
Total liabilities		229
Sales		0
Profit (loss) for the period		(597)
SE Green Energy Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		132,727
Total liabilities		105,619
Sales		0
Profit (loss) for the period		816
KEPCO Mangilao America LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		0
Total liabilities		0
Sales		0
Profit (loss) for the period		0
Mangilao Intermediate Holdings LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		13,220
Total liabilities		12,774
Sales		0
Profit (loss) for the period		(66)
KEPCO CSC Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		837
Total liabilities		51
Sales		0
Profit (loss) for the period		(14)
KOAK Power Limited
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		15,930
Total liabilities		0
Sales		0
Profit (loss) for the period		0
KOMIPO Europe B.V.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		7,362
Total liabilities		0
Sales		0
Profit (loss) for the period		(286)
Haenanum Energy Fund
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		28,101
Total liabilities		1
Sales		0
Profit (loss) for the period		1
Paju Ecoenergy Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		53,839
Total liabilities		0
Sales		0
Profit (loss) for the period		₩ 0
[1]	Financial information of EWP America Inc. includes that of six other subsidiaries, EWP Renewable Corporation, DG Fairhaven Power, LLC, DG Whitefield, LLC, Springfield Power, LLC, California Power Holdings, LLC, and EWPRC Biomass Holdings, LLC.
[2]	Financial information of Energy New Industry Specialized Investment Private Investment Trust includes that of three other subsidiaries, BSK E-New Industry Fund VII, e-New Industry LB Fund 1 and Songhyun e-New Industry Fund.

Details of non-controlling inte

Details of non-controlling interest prior to intra-group eliminations (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Subsidiaries [Member]
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items]
Current assets of subsidiaries	₩ 2,075,884	₩ 2,030,665	₩ 2,311,226
Non-current assets of subsidiaries	4,421,596	4,165,052	3,978,658
Current liabilities of subsidiaries	(933,560)	(1,094,870)	(916,288)
Non-current liabilities of subsidiaries	(2,304,159)	(2,058,206)	(2,150,581)
Net assets of subsidiaries	3,259,761	3,042,641	3,223,015
Book value of non-controlling interest	1,393,331	1,502,377	1,412,707
Sales of subsidiaries	2,643,343	2,739,186	2,550,576
Profit for the period of subsidiaries	175,990	315,816	289,443
Profit for the period attributable to non-controlling interest of subsidiaries	81,982	135,970	126,529
Cash flows from operating activities of subsidiaries	512,611	414,012	375,934
Cash flows from investing activities of subsidiaries	(393,916)	(143,447)	(616,659)
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries	75,591	(476,730)	223,880
Dividends to non-controlling interests of subsidiaries	(99,256)	(110,331)	(86,108)
Effect of exchange rate fluctuation of subsidiaries	4,005	4,051	(33,006)
Net increase (decrease) of cash and cash equivalents of subsidiaries	₩ 99,035	₩ (312,445)	₩ (135,959)
KEPCO Ilijan Corporation
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items]
Percentage of ownership	49.00%	49.00%	49.00%
Current assets of subsidiaries	₩ 173,931	₩ 163,622	₩ 160,588
Non-current assets of subsidiaries	197,446	267,822	314,036
Current liabilities of subsidiaries	(11,990)	(16,819)	(21,546)
Non-current liabilities of subsidiaries	(44,166)	(36,594)	(36,255)
Net assets of subsidiaries	315,221	378,031	416,823
Book value of non-controlling interest	154,458	185,235	204,243
Sales of subsidiaries	95,072	99,844	109,183
Profit for the period of subsidiaries	40,818	49,631	66,320
Profit for the period attributable to non-controlling interest of subsidiaries	20,001	24,319	32,497
Cash flows from operating activities of subsidiaries	101,707	92,822	123,534
Cash flows from investing activities of subsidiaries	4,458	(4,452)	(5,276)
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries	(68,678)	(53,733)	(44,442)
Dividends to non-controlling interests of subsidiaries	(48,750)	(51,626)	(48,855)
Effect of exchange rate fluctuation of subsidiaries	2,111	2,840	(7,432)
Net increase (decrease) of cash and cash equivalents of subsidiaries	₩ (9,152)	₩ (14,149)	₩ 17,529
KEPCO Plant Service & Engineering
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items]
Percentage of ownership	49.00%	49.00%	49.00%
Current assets of subsidiaries	₩ 779,764	₩ 628,725	₩ 623,934
Non-current assets of subsidiaries	577,219	646,640	571,152
Current liabilities of subsidiaries	(247,737)	(270,097)	(278,562)
Non-current liabilities of subsidiaries	(47,020)	(26,331)	(16,127)
Net assets of subsidiaries	1,062,226	978,937	900,397
Book value of non-controlling interest	520,491	479,679	441,194
Sales of subsidiaries	1,244,613	1,239,604	1,232,113
Profit for the period of subsidiaries	157,737	160,791	135,482
Profit for the period attributable to non-controlling interest of subsidiaries	77,291	78,788	66,386
Cash flows from operating activities of subsidiaries	164,373	129,700	129,801
Cash flows from investing activities of subsidiaries	(89,159)	(123,593)	(193,408)
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries	(44,332)	(33,737)	(15,606)
Dividends to non-controlling interests of subsidiaries	(39,466)	(32,414)	(14,994)
Effect of exchange rate fluctuation of subsidiaries	(593)	(124)	(1,267)
Net increase (decrease) of cash and cash equivalents of subsidiaries	₩ (9,177)	₩ (60,168)	₩ (95,474)
KEPCO Engineering & Construction Company
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items]
Percentage of ownership	33.92%	33.92%	33.92%
Current assets of subsidiaries	₩ 257,593	₩ 281,390	₩ 257,529
Non-current assets of subsidiaries	477,614	490,090	504,637
Current liabilities of subsidiaries	(223,522)	(248,402)	(221,860)
Non-current liabilities of subsidiaries	(19,472)	(61,698)	(83,274)
Net assets of subsidiaries	492,213	461,380	457,032
Book value of non-controlling interest	166,959	156,500	155,025
Sales of subsidiaries	448,635	433,701	490,193
Profit for the period of subsidiaries	26,398	12,937	21,222
Profit for the period attributable to non-controlling interest of subsidiaries	8,954	4,388	7,199
Cash flows from operating activities of subsidiaries	27,081	81,042	62,578
Cash flows from investing activities of subsidiaries	47,219	(50,569)	(8,622)
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries	(34,632)	(14,591)	(55,504)
Dividends to non-controlling interests of subsidiaries	(1,807)	(2,839)	(1,419)
Effect of exchange rate fluctuation of subsidiaries	(14)	31	(101)
Net increase (decrease) of cash and cash equivalents of subsidiaries	37,847	13,074	(3,068)
Others
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items]
Current assets of subsidiaries	864,596	956,928	1,269,175
Non-current assets of subsidiaries	3,169,317	2,760,500	2,588,833
Current liabilities of subsidiaries	(450,311)	(559,552)	(394,320)
Non-current liabilities of subsidiaries	(2,193,501)	(1,933,583)	(2,014,925)
Net assets of subsidiaries	1,390,101	1,224,293	1,448,763
Book value of non-controlling interest	551,423	680,963	612,245
Sales of subsidiaries	855,023	966,037	719,087
Profit for the period of subsidiaries	(48,963)	92,457	66,419
Profit for the period attributable to non-controlling interest of subsidiaries	(24,264)	28,475	20,447
Cash flows from operating activities of subsidiaries	219,450	110,448	60,021
Cash flows from investing activities of subsidiaries	(356,434)	35,167	(409,353)
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries	223,233	(374,669)	339,432
Dividends to non-controlling interests of subsidiaries	(9,233)	(23,452)	(20,840)
Effect of exchange rate fluctuation of subsidiaries	2,501	1,304	(24,206)
Net increase (decrease) of cash and cash equivalents of subsidiaries	₩ 79,517	₩ (251,202)	₩ (54,946)

Gain (loss) from Disposals of s

Gain (loss) from Disposals of subsidiaries (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]
gain (loss) of Disposaled subsidiaries	₩ (256)	[1]	₩ 72	[1]	₩ 0
Fair value of Disposaled subsidiaries
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]
gain (loss) of Disposaled subsidiaries	4		160		0
Consideration received in cash
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]
gain (loss) of Disposaled subsidiaries	4		160		0
Carrying value of Disposaled subsidiaries
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]
gain (loss) of Disposaled subsidiaries	73		158		0
Cash and Cash Equivalents
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]
gain (loss) of Disposaled subsidiaries	97		175		0
Trade receivables
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]
gain (loss) of Disposaled subsidiaries	0		11		0
Other non-financial assets
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]
gain (loss) of Disposaled subsidiaries	1		0		0
PP&E and intangible assets
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]
gain (loss) of Disposaled subsidiaries	2		0		0
Trade and other payables
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]
gain (loss) of Disposaled subsidiaries	(3)		(28)		0
Other non-financial liabilities
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]
gain (loss) of Disposaled subsidiaries	(24)		0		0
Non-controlling interests
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]
gain (loss) of Disposaled subsidiaries	0		0		0
Realization of unrealized gain
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]
gain (loss) of Disposaled subsidiaries	(187)		70		0
Other comprehensive income
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]
gain (loss) of Disposaled subsidiaries	₩ 0		₩ 0		₩ 0
[1]	Gain (loss) on disposals of subsidiaries is included in the consolidated statements of comprehensive income (loss).

Cashflows From Disposaled subsi

Cashflows From Disposaled subsidiaries (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of Cashflows From Disposaled subsidiaries [Abstract]
Consideration received in cash	₩ 4	₩ 160	₩ 0
Less: cash held by disposed subsidiaries	(97)	(175)	0
Net cash flow	₩ (93)	₩ (15)	₩ 0

Cash dividends received from su

Cash dividends received from subsidiaries (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Korea Hydro & Nuclear Power
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	₩ 0	₩ 281,234	₩ 543,072
Korea South-East Power
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	7,143	33,928	106,546
Korea Midland Power
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	26,581	54,305
Korea Western Power
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	28,996	66,992
Korea Southern Power
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	15,277	25,780	60,630
Korea East-West Power
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	985	61,408	94,430
KEPCO Engineering & Construction Company
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	3,519	5,531	2,765
KEPCO Plant Service & Engineering
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	41,084	33,739	15,607
KEPCO Nuclear Fuel
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	4,219	1,077	3,231
KEPCO KDN
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	19,136	13,888	4,352
KEPCO International HongKong
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	10,243	23,314	4,304
KEPCO International Philippines
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	70,480	52,507	44,906
KEPCO Ilijan Corporation
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	65,776	53,900	50,849
KEPCO Philippines Holdings
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	63,522	0	26,023
KOSEP Australia
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	8,120	0	0
KOSPO Australia
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	4,335	0	0
Qatrana Electric Power Company
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	10,313	6,240	5,939
KEPCO KPS Philippines Corp.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	3,854	0	0
Tamra Offshore Wind Power Co., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	4,823	0	0
KEPCO Netherlands S3 B.V.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	874	3,115	0
PT. KOMIPO Pembangkitan Jawa Bali
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	1,971	20,658	3,188
KEPCO Netherlands J3 B.V.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	12,090	0
Gyeongju Wind Power
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	2,800	0	0
Energy New Industry Specialized Investment Private Investment Trust
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	0	291
VI Carbon Professional Private Special Asset Investment Trust 1 (formally, HI Carbon Professional Private Special Asset)
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	11	11	11
KOSPO Power Services Limitada
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	745	993	425
KEPCO Solar of Alamosa, LLC (formerly, Cogentrix of Alamosa, LLC)
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	0	344
KEPCO Netherlands B.V.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	13,266	17,424	0
PT. Cirebon Power Service
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	382	0
Chitose Solar Power Plant LLC
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	₩ 814	₩ 1,986	₩ 0

Investments in Associates (Deta

Investments in Associates (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2019		Dec. 31, 2018
Disclosure of associates [Line Items]
Acquisition cost		₩ 2,539,956		₩ 2,338,421
Book value
Beginning balance		4,064,820		3,837,421
Acquisition		17,659		82,283
Disposal				0
Dividends received		(136,012)		(73,049)
Share of income (loss)		37,418		216,009
Other comprehensive income (loss)		39,199		14,148
Others (book value)		228,718		(11,992)
Ending balance		₩ 4,251,802		₩ 4,064,820
Korea Gas Corporation
Disclosure of associates [Line Items]
Key operation activities	[1]	Importing and wholesaling LNG		Importing and wholesaling LNG
Location	[1]	KOREA		KOREA
Percentage of ownership	[1]	20.47%		20.47%
Effective percentage of ownership	[2]	21.57%		21.57%
Acquisition cost	[1]	₩ 94,500		₩ 94,500
Book value
Beginning balance		1,701,848		1,618,868
Acquisition		0		0
Disposal		0		0
Dividends received		(25,704)		0
Share of income (loss)		8,511		107,952
Other comprehensive income (loss)		12,687		(24,843)
Others (book value)		(3,375)		(129)
Ending balance		1,693,967		1,701,848
The fair value of associates	[3]	715,365		910,980
Share in net assets		1,757,205		1,834,141
Total assets		39,311,855	[4]	39,689,692	[5]
Total liabilities		31,165,334	[4]	31,186,488	[5]
Net assets		8,146,521		8,503,204
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		(63,238)		(132,293)
Sales of Associates		24,982,640	[4]	26,185,038	[5]
Profit (loss) for the period of Associates		₩ 38,764	[4]	₩ 523,480	[5]
Korea Electric Power Industrial Development Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Electricity metering and others		Electricity metering and others
Location		KOREA		KOREA
Percentage of ownership		29.00%		29.00%
Effective percentage of ownership	[2]	29.00%		29.00%
Acquisition cost		₩ 4,727		₩ 4,727
Book value
Beginning balance		21,838		21,838
Acquisition		0		0
Disposal		0		0
Dividends received		(1,598)		(1,872)
Share of income (loss)		5,002		2,584
Other comprehensive income (loss)		0		(102)
Others (book value)		151		(610)
Ending balance		25,393		21,838
The fair value of associates		33,089		33,609
Share in net assets		25,393		21,838
Total assets		186,434		144,425
Total liabilities		98,872		69,123
Net assets		87,562		75,302
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		306,026		325,694
Profit (loss) for the period of Associates		₩ 17,467		₩ 9,987
YTN Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Broadcasting		Broadcasting
Location		KOREA		KOREA
Percentage of ownership		21.43%		21.43%
Effective percentage of ownership	[2]	21.43%		21.43%
Acquisition cost		₩ 59,000		₩ 59,000
Book value
Beginning balance		40,338		40,606
Acquisition		0		0
Disposal		0		0
Dividends received		(180)		(180)
Share of income (loss)		(449)		545
Other comprehensive income (loss)		5		(186)
Others (book value)		33		(447)
Ending balance		39,747		40,338
The fair value of associates		18,450		18,900
Share in net assets		39,747		40,346
Total assets		281,699		286,964
Total liabilities		96,211		98,682
Net assets		185,488		188,282
Investment differential		0		0
Intercompany transaction		0		(6)
Others (consolidated FS)		0		(2)
Sales of Associates		127,782		132,382
Profit (loss) for the period of Associates		₩ (1,230)		₩ 1,587
Cheongna Energy Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Generating and distributing vapor and hot/cold water		Generating and distributing vapor and hot/cold water
Location		KOREA		KOREA
Percentage of ownership		43.90%		43.90%
Effective percentage of ownership	[2]	43.90%		43.90%
Acquisition cost		₩ 48,353		₩ 48,353
Book value
Beginning balance		3,465		8,337
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(2,054)		(4,872)
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		1,411		3,465
Share in net assets		(112)		1,015
Total assets		383,034		431,234
Total liabilities		383,288		428,921
Net assets		(254)		2,313
Investment differential		2,584		2,584
Intercompany transaction		(1,061)		(134)
Others (consolidated FS)		0		0
Sales of Associates		68,626		64,594
Profit (loss) for the period of Associates		₩ (2,567)		₩ (11,110)
Gangwon Wind Power Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities	[6]	Power generation		Power generation
Location	[6]	KOREA		KOREA
Percentage of ownership	[6]	15.00%		15.00%
Effective percentage of ownership	[2]	15.00%		15.00%
Acquisition cost	[6]	₩ 5,725		₩ 5,725
Book value
Beginning balance		13,220		13,855
Acquisition		0		0
Disposal		0		0
Dividends received		(2,272)		(2,272)
Share of income (loss)		1,379		1,637
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		12,327		13,220
Share in net assets		12,278		13,171
Total assets		83,528		89,614
Total liabilities		1,674		1,805
Net assets		81,854		87,809
Investment differential		49		0
Intercompany transaction		0		0
Others (consolidated FS)		0		49
Sales of Associates		24,116		25,407
Profit (loss) for the period of Associates		₩ 9,380		₩ 10,926
Hyundai Green Power Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		29.00%		29.00%
Effective percentage of ownership	[2]	29.00%		29.00%
Acquisition cost		₩ 88,885		₩ 88,885
Book value
Beginning balance		127,160		114,806
Acquisition		0		0
Disposal		0		0
Dividends received		(8,889)		(8,889)
Share of income (loss)		5,982		21,243
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		124,253		127,160
Share in net assets		124,253		127,160
Total assets		1,086,738		1,127,220
Total liabilities		658,279		688,738
Net assets		428,459		438,482
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		507,653		501,798
Profit (loss) for the period of Associates		₩ 26,222		₩ 66,925
Shareholders' agreements that may cause future economic resource or cash outflows		As of December 31, 2019, Hyundai Green Power Co., Ltd., an associate of the Group, which engages in the byproduct gas power generating business, entered into a project financing agreement with a limit of W919.2 billion with Korea Development Bank and others. At a certain period in the future, the Group has call option against the financial investors (Korea Development Bank and others) and also has an obligation to purchase its shares when claimed by the financial investors. At a certain period in the future, the Group has put option against Hyundai Steel Company and a third party designated by Hyundai Steel Company (collectively, "Hyundai Steel Group"), the operating investor of Hyundai Green Power Co., Ltd., according to the conditions of the agreement and also has an obligation to sell its shares upon request from Hyundai Steel Company.		As of December 31, 2018, Hyundai Green Power Co., Ltd., an associate of the Company, which engages in the byproduct gas power generating business, entered into a project financing agreement with a limit of W852.1 billion with Korea Development Bank and others. At a certain period in the future, the Company has call option against the financial investors (Korea Development Bank and others) and also has an obligation to purchase its shares when claimed by the financial investors. At a certain period in the future, the Company has put option against Hyundai Steel Company and a third party designated by Hyundai Steel Company (collectively, "Hyundai Steel Company"), the operating investor of Hyundai Green Power Co., Ltd., according to the conditions of the agreement and also has an obligation to sell its shares upon request from Hyundai Steel Company.
Korea Power Exchange
Disclosure of associates [Line Items]
Key operation activities	[7]	Management of power market and others		Management of power market and others
Location	[7]	KOREA		KOREA
Percentage of ownership	[7]	100.00%		100.00%
Effective percentage of ownership	[2]	100.00%		100.00%
Acquisition cost	[7]	₩ 127,839		₩ 127,839
Book value
Beginning balance		251,802		237,631
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		10,907		16,031
Other comprehensive income (loss)		0		0
Others (book value)		(3,810)		(1,860)
Ending balance		258,899		251,802
Share in net assets		260,757		251,802
Total assets		315,683		304,318
Total liabilities		54,926		52,516
Net assets		260,757		251,802
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		(1,858)		0
Sales of Associates		107,034		108,571
Profit (loss) for the period of Associates		₩ 8,268		₩ 16,031
AMEC Partners Korea Ltd.
Disclosure of associates [Line Items]
Key operation activities		Resources development		Resources development	[8]
Location		KOREA		KOREA	[8]
Percentage of ownership		19.00%		19.00%	[8]
Effective percentage of ownership	[2]	19.00%		19.00%
Acquisition cost		₩ 0		₩ 707	[8]
Book value
Beginning balance		209		215
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		0		(6)
Other comprehensive income (loss)		3		0
Others (book value)		(212)		0
Ending balance		0		209
Share in net assets				209
Total assets				1,113
Total liabilities				14
Net assets				1,099
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		0		0
Profit (loss) for the period of Associates		₩ 0		₩ (26)
Hyundai Energy
Disclosure of associates [Line Items]
Key operation activities	[9]	Power generation		Power generation
Location	[9]	KOREA		KOREA
Percentage of ownership	[9]	30.66%		30.66%
Effective percentage of ownership	[2]	46.30%		46.30%
Acquisition cost	[9]	₩ 71,070		₩ 71,070
Book value
Beginning balance		0		0
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		0		0
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		0		0
Share in net assets		(39,217)		(26,285)
Total assets		465,238		470,818
Total liabilities		549,940		527,590
Net assets		(84,702)		(56,772)
Investment differential		0		0
Intercompany transaction		(954)		(996)
Others (consolidated FS)		40,171		27,281
Sales of Associates		91,842		101,998
Profit (loss) for the period of Associates		₩ (27,882)		₩ (33,947)
Shareholders' agreements that may cause future economic resource or cash outflows		The Company had placed guarantees for a fixed return on the investment to NH Power II Co., Ltd. and National Agricultural Cooperative Federation ("NACF") and had obtained the rights to acquire the investment securities in return preferentially. In addition, NH Power II Co., Ltd. and NACF have a right, which can be exercised for 30 days starting from 2 months to 1 month prior to 17 years after the termination date of the contract to sell their shares to the Company.		The Company had placed guarantees for a fixed return on the investment to NH Power II Co., Ltd. and National Agricultural Cooperative Federation ("NACF") and had obtained the rights to acquire the investment securities in return preferentially. In addition, NH Power II Co., Ltd. and NACF have a right, which can be exercised for 30 days starting from 2 months to 1 month prior to 17 years after the termination date of the contract to sell their shares to the Company.
Ecollite Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Artificial light-weight aggregate		Artificial light-weight aggregate
Location		KOREA		KOREA
Percentage of ownership		36.10%		36.10%
Effective percentage of ownership	[2]	36.10%		36.10%
Acquisition cost		₩ 1,516		₩ 1,516
Book value
Beginning balance		0		0
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		0		0
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		0		0
Share in net assets		554		589
Total assets		1,838		1,944
Total liabilities		304		312
Net assets		1,534		1,632
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		(554)		(589)
Sales of Associates		0		0
Profit (loss) for the period of Associates		₩ (97)		₩ (68)
Taebaek Wind Power Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		25.00%		25.00%
Effective percentage of ownership	[2]	25.00%		25.00%
Acquisition cost		₩ 3,810		₩ 3,810
Book value
Beginning balance		5,665		5,319
Acquisition		0		0
Disposal		0		0
Dividends received		0		(196)
Share of income (loss)		1,374		542
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		7,039		5,665
Share in net assets		7,039		5,665
Total assets		36,182		36,986
Total liabilities		8,027		14,325
Net assets		28,155		22,661
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		6,177		8,233
Profit (loss) for the period of Associates		₩ 5,494		₩ 2,170
Shareholders' agreements that may cause future economic resource or cash outflows		In the case where non-controlling shareholders decide to dispose of their shares in Taebaek Wind Power Co., Ltd. after the warrant period of defect repair for wind power generator has expired, the Group acquires those shares at fair value. The acquisition is to be made after the conditions of the acquisition are discussed among the parties involved, with consideration of various factors such as financial status and business situation.		In case non-controlling shareholders decide to dispose of their shares in Taebaek Wind Power Co., Ltd. after the warrant period of defect repair for wind power generator has expired, the Company acquires those shares at fair value. The acquisition is to be made after the conditions of the acquisition are discussed among the parties involved, with consideration of various factors such as financial status and business situation.
Significant restrictions on its abilities		Financial institutions can reject or defer an approval with regard to the request for fund executions on subordinated loans of shareholders in order to pay senior loans based on the loan agreement. Dividends can only be paid when all conditions of the loan agreement are satisfied or prior written consent of financial institutions is obtained. Shares cannot be wholly or partially transferred without prior written consent of financial institutions is obtained.		Financial institutions can reject or defer an approval with regard to the request for fund executions on subordinated loans of shareholders in order to pay senior loans based on the loan agreement.
Taeback Guinemi Wind Power Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		25.00%		25.00%
Effective percentage of ownership	[2]	25.00%		25.00%
Acquisition cost		₩ 3,420		₩ 3,420
Book value
Beginning balance		2,569		3,089
Acquisition		0		0
Disposal		0		0
Dividends received				0
Share of income (loss)		(16)		(520)
Other comprehensive income (loss)				0
Others (book value)				0
Ending balance		2,553		2,569
Share in net assets		2,553		2,569
Total assets		35,061		10,929
Total liabilities		24,847		653
Net assets		10,214		10,276
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		349		0
Profit (loss) for the period of Associates		₩ (61)		₩ (2,082)
Shareholders' agreements that may cause future economic resource or cash outflows		At the commencement of the operation of the faciliity, the Group has a right to purchase all or part of the shares from the shareholders at fair value.
Significant restrictions on its abilities		Dividends can only be paid when all conditions of the shareholder's agreement are satisfied. Also, shares cannot be wholly or partially transferred without consent of the stakeholders is obtained.
Pyeongchang Wind Power Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		25.00%		25.00%
Effective percentage of ownership	[2]	25.00%		25.00%
Acquisition cost		₩ 3,875		₩ 3,875
Book value
Beginning balance		5,419		4,136
Acquisition		0		0
Disposal				0
Dividends received				0
Share of income (loss)		458		1,283
Other comprehensive income (loss)				0
Others (book value)				0
Ending balance		5,877		5,419
Share in net assets		5,877		5,419
Total assets		79,756		82,038
Total liabilities		56,248		60,362
Net assets		23,508		21,676
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		10,713		12,615
Profit (loss) for the period of Associates		₩ 2,010		₩ 4,249
Shareholders' agreements that may cause future economic resource or cash outflows		In the case where non-controlling shareholders decide to dispose of their shares in Pyeongchang Wind Power Co., Ltd. after commercial operation of the power plant has started, the Group acquires those shares at fair value. The acquisition is to be made after the conditions of the acquisition are discussed among the parties involved, with the careful consideration of various factors such as financial status and business situation.		In case non-controlling shareholders decide to dispose of their shares in Pyeongchang Wind Power Co., Ltd. after commercial operation of the power plant has started, the Company acquires those shares at fair value. The acquisition is to be made after the conditions of the acquisition are discussed among the parties involved, with the careful consideration of various factors such as financial status and business situation.
Significant restrictions on its abilities		Principals on subordinated loans or dividends can only be paid when all conditions of the loan agreement are satisfied or prior written consent of financial institutions is obtained. Shares cannot be wholly or partially transferred without prior written consent of financial institutions is obtained.		Principals on subordinated loans or dividends can only be paid when all conditions of the loan agreement are satisfied or prior written consent of financial institutions is obtained.
Daeryun Power Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities	[8]	Power generation		Power generation
Location	[8]	KOREA		KOREA
Percentage of ownership	[8]	9.34%		9.34%
Effective percentage of ownership	[2]	9.34%		9.34%
Acquisition cost	[8]	₩ 40,854		₩ 40,854
Book value
Beginning balance		26,099	[10]	25,113
Acquisition		0		0	[10]
Disposal		0		0	[10]
Dividends received	[10]			0
Share of income (loss)		173		(189)	[10]
Other comprehensive income (loss)	[10]			184
Others (book value)		(25)		991	[10]
Ending balance		26,247		26,099	[10]
Share in net assets		27,066		26,919
Total assets		802,546		798,569
Total liabilities		512,757		510,358
Net assets		289,789		288,211
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		(819)		(820)
Sales of Associates		163,129		62,252
Profit (loss) for the period of Associates		₩ 1,836		₩ (4,958)
Significant restrictions on its abilities		Principals on subordinated loans or dividends can only be paid when all conditions of the loan agreement are satisfied or prior written consent of financial institutions is obtained and Shares cannot be wholly or partially transferred without consent of the majority of lenders is obtained.		Principals on subordinated loans or dividends can only be paid when all conditions of the loan agreement are satisfied or prior written consent of financial institutions is obtained.
Changjuk Wind Power Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		30.00%		30.00%
Effective percentage of ownership	[2]	30.00%		30.00%
Acquisition cost		₩ 3,801		₩ 3,801
Book value
Beginning balance		8,086		7,515
Acquisition		0		0
Disposal		0		0
Dividends received		0		(416)
Share of income (loss)		434		987
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		8,520		8,086
Share in net assets		8,520		8,086
Total assets		29,875		33,148
Total liabilities		1,476		6,194
Net assets		28,399		26,954
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		6,076		7,929
Profit (loss) for the period of Associates		₩ 1,447		₩ 3,291
Significant restrictions on its abilities				Principals on subordinated loans or dividends can only be paid when all conditions of the loan agreement are satisfied or prior written consent of financial institutions is obtained.
KNH Solar Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		27.00%		27.00%
Effective percentage of ownership	[2]	27.00%		27.00%
Acquisition cost		₩ 1,296		₩ 1,296
Book value
Beginning balance		2,337		2,218
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		45		119
Other comprehensive income (loss)				0
Others (book value)				0
Ending balance		2,382		2,337
Share in net assets		2,382		2,337
Total assets		20,465		22,598
Total liabilities		11,641		13,942
Net assets		8,824		8,656
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		3,377		3,586
Profit (loss) for the period of Associates		₩ 278		₩ 439
Significant restrictions on its abilities		Principal and interest, dividends to shareholders cannot be paid without written consent of financial institutions. Also, Shares cannot be wholly or partially transferred without consent of other shareholders is obtained.		Principal and interest, dividends to shareholders cannot be paid without written consent of financial institutions.
SPC Power Corporation
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		PHILIPPINES		PHILIPPINES
Percentage of ownership		38.00%		38.00%
Effective percentage of ownership	[2]	38.00%		38.00%
Acquisition cost		₩ 20,635		₩ 20,635
Book value
Beginning balance		57,558		52,283
Acquisition		0		0
Disposal		0		0
Dividends received		(14,229)		(9,549)
Share of income (loss)		5,929		4,235
Other comprehensive income (loss)		14,286		10,578
Others (book value)		39		11
Ending balance		63,583		57,558
The fair value of associates		117,230		72,710
Share in net assets		86,672		79,336
Total assets		250,544		225,599
Total liabilities		22,459		16,819
Net assets		228,085		208,780
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		(23,089)		(21,778)
Sales of Associates		63,218		50,317
Profit (loss) for the period of Associates		₩ 39,876		₩ 37,355
Gemeng International Energy Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		CHINA		CHINA
Percentage of ownership		34.00%		34.00%
Effective percentage of ownership	[2]	34.00%		34.00%
Acquisition cost		₩ 413,153		₩ 413,153
Book value
Beginning balance		647,010		649,973
Acquisition		0		0
Disposal		0		0
Dividends received		(11,468)		(11,246)
Share of income (loss)		26,300		15,156
Other comprehensive income (loss)		9,209		(6,873)
Others (book value)		(155)		0
Ending balance		670,896		647,010
Share in net assets		670,896		930,028
Total assets		6,758,957		7,155,937
Total liabilities		4,785,740		4,420,561
Net assets		1,973,217		2,735,376
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		(283,018)
Sales of Associates		2,024,730		1,921,367
Profit (loss) for the period of Associates		₩ 95,435		₩ 120,558
Shareholders' agreements that may cause future economic resource or cash outflows		Gemeng International Energy Co., Ltd. issued put options on 8% of its shares to its financial investors, KEPCO Woori Sprott PEF (NPS Co-Pa PEF). If the investment fund is not collected until the maturity date (December 25, 2023, two years extension is possible), PEF can exercise the option at strike price which is the same as a principal investment price (including operating fees ratio of below 1% per annum), and also, the Group provided a performance guarantee on this agreement.		Gemeng International Energy Co., Ltd., issued put options on 8% of its shares to its financial investors, KEPCO Woori Sprott PEF (NPS Co-Pa PEF). If the investment fund is not collected until the maturity date (December 25, 2023, two years extension is possible), PEF can exercise the option at strike price which is the same as a principal investment price (including operating fees ratio of below 1% per annum), and also, the Company provided a performance guarantee on this agreement.
PT. Cirebon Electric Power
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		INDONESIA		INDONESIA
Percentage of ownership		27.50%		27.50%
Effective percentage of ownership	[2]	27.50%		27.50%
Acquisition cost		₩ 40,365		₩ 40,365
Book value
Beginning balance		108,628		97,410
Acquisition		0		0
Disposal		0		0
Dividends received				(4,432)
Share of income (loss)		11,079		9,385
Other comprehensive income (loss)		(65)		6,265
Others (book value)		3,783		0
Ending balance		123,425		108,628
Share in net assets		123,425		108,628
Total assets		852,457		876,069
Total liabilities		403,639		481,061
Net assets		448,818		395,008
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		277,370		274,962
Profit (loss) for the period of Associates		₩ 39,581		₩ 33,144
KNOC Nigerian East Oil
Disclosure of associates [Line Items]
Key operation activities	[11]	Resources development		Resources development
Location	[11]	NIGERIA		NIGERIA
Percentage of ownership	[11]	14.63%		14.63%
Effective percentage of ownership	[2]	14.63%		14.63%
Acquisition cost	[11]	₩ 12		₩ 12
Book value
Beginning balance		0		0
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(27)		2,615
Other comprehensive income (loss)		(380)		(471)
Others (book value)		407		(2,144)
Ending balance		0		0
Share in net assets		(11,113)		(10,706)
Total assets		58,402		78,841
Total liabilities		134,361		152,017
Net assets		(75,959)		(73,176)
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		11,113		10,706
Sales of Associates		0		0
Profit (loss) for the period of Associates		₩ (182)		₩ (398)
KNOC Nigerian West Oil
Disclosure of associates [Line Items]
Key operation activities	[11]	Resources development		Resources development
Location	[11]	NIGERIA		NIGERIA
Percentage of ownership	[11]	14.63%		14.63%
Effective percentage of ownership	[2]	14.63%		14.63%
Acquisition cost	[11]	₩ 12		₩ 12
Book value
Beginning balance		0		0
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(29)		2,342
Other comprehensive income (loss)		(349)		(414)
Others (book value)		378		(1,928)
Ending balance		0		0
Share in net assets		(10,213)		(9,835)
Total assets		54,275		70,437
Total liabilities		124,086		137,663
Net assets		(69,811)		(67,226)
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		10,213		9,835
Sales of Associates		0		0
Profit (loss) for the period of Associates		₩ (180)		₩ (400)
PT Wampu Electric Power
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		INDONESIA		INDONESIA
Percentage of ownership		46.00%		46.00%
Effective percentage of ownership	[2]	46.00%		46.00%
Acquisition cost		₩ 21,292		₩ 21,292
Book value
Beginning balance		31,097		29,403
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(2,867)		408
Other comprehensive income (loss)		2		1,286
Others (book value)		1,123		0
Ending balance		29,355		31,097
Share in net assets		29,355		31,097
Total assets		222,266		223,009
Total liabilities		158,451		155,406
Net assets		63,815		67,603
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		18,165		13,463
Profit (loss) for the period of Associates		₩ (2,315)		₩ 4,624
PT. Bayan Resources TBK
Disclosure of associates [Line Items]
Key operation activities		Resources development		Resources development
Location		INDONESIA		INDONESIA
Percentage of ownership		20.00%		20.00%
Effective percentage of ownership	[2]	20.00%		20.00%
Acquisition cost		₩ 615,860		₩ 615,860
Book value
Beginning balance		511,646		451,831
Acquisition		0		0
Disposal		0		0
Dividends received		(71,100)		0
Share of income (loss)		6,181		(33,651)
Other comprehensive income (loss)		(1,586)		74,776
Others (book value)		0		18,690
Ending balance		445,141		511,646
The fair value of associates		880,860		1,017,601
Share in net assets		136,012		164,262
Total assets		1,302,637		1,388,199
Total liabilities		622,576		566,890
Net assets		680,061		821,309
Investment differential		385,508		423,763
Intercompany transaction		0		0
Others (consolidated FS)		(76,379)		(76,379)
Sales of Associates		1,707,387		1,707,387
Profit (loss) for the period of Associates		₩ 252,855		₩ 521,666
S-Power Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		49.00%		49.00%
Effective percentage of ownership	[2]	49.00%		49.00%
Acquisition cost		₩ 132,300		₩ 132,300
Book value
Beginning balance		114,566		116,945
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		1,218		(2,326)
Other comprehensive income (loss)		0		0
Others (book value)		0		(53)
Ending balance		115,784		114,566
Share in net assets		117,403		116,293
Total assets		805,622		825,354
Total liabilities		566,025		588,022
Net assets		239,597		237,332
Investment differential		0		0
Intercompany transaction		(1,619)		(1,727)
Others (consolidated FS)		0		0
Sales of Associates		576,554		551,378
Profit (loss) for the period of Associates		₩ 2,319		₩ (6,185)
Pioneer Gas Power Limited
Disclosure of associates [Line Items]
Key operation activities	[12]	Power generation		Power generation
Location	[12]	INDIA		INDIA
Percentage of ownership	[12]	38.50%		38.50%
Effective percentage of ownership	[2]	38.50%		38.50%
Acquisition cost	[12]	₩ 49,831		₩ 49,831
Book value
Beginning balance		20,395		38,659
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(20,784)		(17,684)
Other comprehensive income (loss)		389		(580)
Others (book value)		0		0
Ending balance		0		20,395
Share in net assets		(22,459)		(1,951)
Total assets		309,059		311,742
Total liabilities		367,399		316,810
Net assets		(58,340)		(5,068)
Investment differential		22,278		22,278
Intercompany transaction		0		0
Others (consolidated FS)		181		68
Sales of Associates		0		0
Profit (loss) for the period of Associates		(54,501)		₩ (45,934)
Unrecognized equity interest		114
Accumulated unrecognized equity interest		₩ 114
Eurasia Energy Holdings
Disclosure of associates [Line Items]
Key operation activities		Power generation and resources development		Power generation and resources development
Location		RUSSIA		RUSSIA
Percentage of ownership		40.00%		40.00%
Effective percentage of ownership	[2]	40.00%		40.00%
Acquisition cost		₩ 461		₩ 461
Book value
Beginning balance		0		0
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		0		0
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		0		0
Share in net assets		(186)		(179)
Total assets		592		572
Total liabilities		1,056		1,020
Net assets		(464)		(448)
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		186		179
Sales of Associates		0		0
Profit (loss) for the period of Associates		0		0
Unrecognized equity interest		6		7
Accumulated unrecognized equity interest		₩ 185		₩ 179
Xe-Pian Xe-Namnoy Power
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		LAOS		LAOS
Percentage of ownership		25.00%		25.00%
Effective percentage of ownership	[2]	25.00%		25.00%
Acquisition cost		₩ 87,426		₩ 84,374
Book value
Beginning balance		77,165		61,779
Acquisition		3,052		12,893
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(10,210)		(479)
Other comprehensive income (loss)		2,928		2,972
Others (book value)		0		0
Ending balance		72,935		77,165
Share in net assets		74,026		78,207
Total assets		1,194,125		1,015,013
Total liabilities		898,023		702,187
Net assets		296,102		312,826
Investment differential		305		253
Intercompany transaction		(1,106)		(1,006)
Others (consolidated FS)		(290)		(289)
Sales of Associates		6,731		0
Profit (loss) for the period of Associates		₩ (40,437)		₩ (1,214)
Hadong Mineral Fiber Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities	[8]	Recycling fly ashes		Recycling fly ashes
Location	[8]	KOREA		KOREA
Percentage of ownership	[8]	8.33%		8.33%
Effective percentage of ownership	[2]	8.33%		8.33%
Acquisition cost	[8]	₩ 50		₩ 50
Book value
Beginning balance		0		0
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		0		0
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		0		0
Share in net assets		(2)		(2)
Total assets		203		203
Total liabilities		231		231
Net assets		(28)		(28)
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		2		2
Sales of Associates		0		0
Profit (loss) for the period of Associates		0		0
Unrecognized equity interest		0		0
Accumulated unrecognized equity interest		₩ 2		₩ 2
Green Biomass Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities	[13]	Power generation		Power generation
Location	[13]	KOREA		KOREA
Percentage of ownership	[13]	7.85%		8.80%
Effective percentage of ownership	[2]	7.85%		8.80%
Acquisition cost	[13]	₩ 714		₩ 714
Book value
Beginning balance		115		208
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(73)		(93)
Other comprehensive income (loss)		0		0
Others (book value)		66		0
Ending balance		108		115
Share in net assets		108		115
Total assets		3,866		4,411
Total liabilities		2,487		3,107
Net assets		1,379		1,304
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		17		909
Profit (loss) for the period of Associates		₩ (925)		₩ (1,057)
PT. Mutiara Jawa
Disclosure of associates [Line Items]
Key operation activities		Manufacturing and operating floating coal terminal		Manufacturing and operating floating coal terminal
Location		INDONESIA		INDONESIA
Percentage of ownership		29.00%		29.00%
Effective percentage of ownership	[2]	29.00%		29.00%
Acquisition cost		₩ 2,978		₩ 2,978
Book value
Beginning balance		365		0
Acquisition		0		0
Disposal				0
Dividends received				0
Share of income (loss)		1,031		349
Other comprehensive income (loss)		42		16
Others (book value)		0		0
Ending balance		1,438		365
Share in net assets		1,438		365
Total assets		26,109		24,022
Total liabilities		21,150		22,763
Net assets		4,959		1,259
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		11,196		14,393
Profit (loss) for the period of Associates		3,396		3,917
Unrecognized equity interest		0
Unrecognized equity interest				(746)
Accumulated unrecognized equity interest		₩ 0		₩ 0
Samcheok Eco Materials Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities	[14]	Recycling fly ashes		Recycling fly ashes
Location	[14]	KOREA		KOREA
Percentage of ownership	[14]	2.35%		2.35%
Effective percentage of ownership	[2]	25.54%		25.54%
Acquisition cost	[14]	₩ 686		₩ 686
Book value
Beginning balance		0		0
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		0		0
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		0		0
Share in net assets		5,980		505
Total assets		26,625		24,391
Total liabilities		3,209		2,921
Net assets		23,416		21,470
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		(5,980)		(505)
Sales of Associates		10,876		4,135
Profit (loss) for the period of Associates		1,946		(1,836)
Unrecognized equity interest				1,285
Unrecognized equity interest		(497)
Accumulated unrecognized equity interest		₩ 788		₩ 1,285
Shareholders' agreements that may cause future economic resource or cash outflows				The Company has the rights to purchase the stocks should preferred stockholders elect to sell their stocks on the expected sell date (3 years from preferred stock payment date) and is required to guarantee the promised yield when preferred stockholders sell their stocks.
Significant restrictions on its abilities		Dividends can only be paid when all conditions of the shareholder's agreement are satisfied. Also, shares cannot be wholly or partially transferred without consent of the stakeholders is obtained.
Noeul Green Energy Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		29.00%		29.00%
Effective percentage of ownership	[2]	29.00%		29.00%
Acquisition cost		₩ 1,740		₩ 1,740
Book value
Beginning balance		8,015		2,067
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(1,395)		5,687
Other comprehensive income (loss)		0		0
Others (book value)		(10)		261
Ending balance		6,610		8,015
Share in net assets		6,610		8,015
Total assets		137,370		147,886
Total liabilities		114,578		120,249
Net assets		22,792		27,637
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		36,435		58,686
Profit (loss) for the period of Associates		₩ (4,810)		₩ 19,453
Naepo Green Energy Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		41.67%		41.67%
Effective percentage of ownership	[2]	41.67%		41.67%
Acquisition cost		₩ 29,200		₩ 29,200
Book value
Beginning balance		0	[15]	20,598
Acquisition		0		0	[15]
Disposal		0		0	[15]
Dividends received		0		0	[15]
Share of income (loss)		0		(13,511)	[15]
Other comprehensive income (loss)		0		0	[15]
Others (book value)		0		(7,087)	[15]
Ending balance		0		0	[15]
Share in net assets		(9,281)		7,085
Total assets		77,070		93,194
Total liabilities		99,345		76,190
Net assets		(22,275)		17,004
Investment differential		2		0
Intercompany transaction		0		0
Others (consolidated FS)		9,279		(7,085)
Sales of Associates		6,572		6,459
Profit (loss) for the period of Associates		(31,577)		₩ (6,623)
Unrecognized equity interest		9,281
Accumulated unrecognized equity interest		₩ 9,281
Significant restrictions on its abilities		Shares cannot be wholly or partially transferred without consent of the stakeholders is obtained.
Goseong Green Energy Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities	[6]	Power generation		Power generation
Location	[6]	KOREA		KOREA
Percentage of ownership	[6]	1.12%		1.12%
Effective percentage of ownership	[2]	1.12%		1.12%
Acquisition cost	[6]	₩ 2,900		₩ 2,900
Book value
Beginning balance		2,459		2,597
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(119)		(138)
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		2,340		2,459
Share in net assets		2,474		2,590
Total assets		3,399,058		1,891,662
Total liabilities		3,177,210		1,659,415
Net assets		221,848		232,247
Investment differential		0		0
Intercompany transaction		(134)		(131)
Others (consolidated FS)		0		0
Sales of Associates		0		0
Profit (loss) for the period of Associates		₩ (10,276)		₩ (7,323)
Gangneung Eco Power Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities	[6]	Power generation		Power generation
Location	[6]	KOREA		KOREA
Percentage of ownership	[6]	1.61%		1.61%
Effective percentage of ownership	[2]	1.61%		1.61%
Acquisition cost	[6]	₩ 2,900		₩ 2,900
Book value
Beginning balance		2,495		2,583
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(65)		(88)
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		2,430		2,495
Share in net assets		2,553		2,615
Total assets		1,362,692		813,938
Total liabilities		1,204,202		651,621
Net assets		158,490		162,317
Investment differential		0		0
Intercompany transaction		(123)		(120)
Others (consolidated FS)		0		0
Sales of Associates		0		0
Profit (loss) for the period of Associates		₩ (3,830)		₩ (4,194)
Shin Pyeongtaek Power Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		40.00%		40.00%
Effective percentage of ownership	[2]	40.00%		40.00%
Acquisition cost		₩ 72,000		₩ 72,000
Book value
Beginning balance		67,600		34,903
Acquisition				28,080
Disposal				0
Dividends received				0
Share of income (loss)		(827)		(2,946)
Other comprehensive income (loss)		198		6,673
Others (book value)		(15)		890
Ending balance		66,956		67,600
Share in net assets		69,712		65,007
Total assets		981,387		674,100
Total liabilities		807,107		511,582
Net assets		174,280		162,518
Investment differential		12,800		12,800
Intercompany transaction		(15,556)		(10,207)
Others (consolidated FS)		0		0
Sales of Associates		119,162		0
Profit (loss) for the period of Associates		₩ 11,847		₩ 682
Heang Bok Do Si Photovoltaic Power Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		28.00%		28.00%
Effective percentage of ownership	[2]	28.00%		28.00%
Acquisition cost		₩ 194		₩ 194
Book value
Beginning balance		202		187
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		13		15
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		215		202
Share in net assets		213		200
Total assets		2,483		2,630
Total liabilities		1,722		1,915
Net assets		761		715
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		2		2
Sales of Associates		454		455
Profit (loss) for the period of Associates		₩ 47		₩ 52
Dongducheon Dream Power Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation	[16]	Power generation	[17]
Location		KOREA	[16]	KOREA	[17]
Percentage of ownership		33.61%	[16]	33.61%	[17]
Effective percentage of ownership	[2]	34.01%		34.01%
Acquisition cost		₩ 148,105	[16]	₩ 148,105	[17]
Book value
Beginning balance		76,386		53,233
Acquisition		0		36,971
Disposal		0		0
Dividends received		0		0
Share of income (loss)		441		(13,824)
Other comprehensive income (loss)		0		0
Others (book value)		(280)		6
Ending balance		76,547		76,386
Share in net assets		91,060		91,260
Total assets		1,474,224		1,512,510
Total liabilities		1,206,478		1,244,178
Net assets		267,746		268,332
Investment differential		1,757		1,757
Intercompany transaction		(3,688)		(4,049)
Others (consolidated FS)		(12,582)		(12,582)
Sales of Associates		689,414		828,430
Profit (loss) for the period of Associates		₩ 2,849		₩ (22,864)
Jinbhuvish Power Generation Pvt. Ltd.
Disclosure of associates [Line Items]
Key operation activities	[6]	Power generation		Power generation
Location	[6]	INDIA		INDIA
Percentage of ownership	[6]	5.16%		5.16%
Effective percentage of ownership	[2]	5.16%		5.16%
Acquisition cost	[6]	₩ 9,000		₩ 9,000
Book value
Beginning balance		0		0
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		0		0
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		0		0
Share in net assets		2,625		2,586
Total assets		64,111		63,163
Total liabilities		13,240		13,044
Net assets		50,871		50,119
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		(2,625)		(2,586)
Sales of Associates		0		0
Profit (loss) for the period of Associates		₩ 0		₩ 0
SE Green Energy Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		47.76%		47.76%
Effective percentage of ownership	[2]	47.76%		47.76%
Acquisition cost		₩ 0		₩ 3,821
Book value
Beginning balance		3,366		3,476
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		0		(110)
Other comprehensive income (loss)		(75)		0
Others (book value)		(3,291)		0
Ending balance		0		3,366
Share in net assets		0		3,366
Total assets				7,048
Total liabilities				0
Net assets		0		7,048
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		₩ 0		0
Sales of Associates				0
Profit (loss) for the period of Associates				₩ (230)
Daejung Offshore Wind Power Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities	[18]	Power generation
Location	[18]	KOREA
Percentage of ownership	[18]	49.90%
Effective percentage of ownership	[2]	49.90%
Acquisition cost	[18]	₩ 5,190
Book value
Others (book value)		2,361
Ending balance		2,361
Share in net assets		2,361
Total assets		6,181
Total liabilities		1,450
Net assets		4,731
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		0
Sales of Associates		0
Profit (loss) for the period of Associates		₩ (617)
Significant restrictions on its abilities		Before the commencement of the operation, shares cannot be wholly or partially transferred without consent of the stakeholders is obtained.
GS Donghae Electric Power Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities	[18]	Power generation
Location	[18]	KOREA
Percentage of ownership	[18]	34.00%
Effective percentage of ownership	[2]	34.00%
Acquisition cost	[18]	₩ 204,000
Book value
Others (book value)		255,983
Ending balance		255,983
Share in net assets		255,983
Total assets		2,301,774
Total liabilities		1,548,883
Net assets		752,891
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		0
Sales of Associates		688,055
Profit (loss) for the period of Associates		₩ 75,842
Daegu Photovoltaic Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		29.00%		29.00%
Effective percentage of ownership	[2]	29.00%		29.00%
Acquisition cost		₩ 1,230		₩ 1,230
Book value
Beginning balance		2,002		1,718
Acquisition		0		0
Disposal		0		0
Dividends received		(327)		(128)
Share of income (loss)		385		412
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		2,060		2,002
Share in net assets		2,060		2,002
Total assets		15,486		16,828
Total liabilities		8,385		9,923
Net assets		7,101		6,905
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		3,639		3,695
Profit (loss) for the period of Associates		₩ 1,442		₩ 1,645
Jeongam Wind Power Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		40.00%		40.00%
Effective percentage of ownership	[2]	40.00%		40.00%
Acquisition cost		₩ 0		₩ 5,580
Book value
Beginning balance		4,589		3,763
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(152)		826
Other comprehensive income (loss)		0		0
Others (book value)		(4,437)		0
Ending balance		0		4,589
Share in net assets				4,589
Total assets				93,444
Total liabilities				81,971
Net assets				11,473
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		0		1,559
Profit (loss) for the period of Associates		₩ 0		₩ 2,154
Shareholders' agreements that may cause future economic resource or cash outflows		In the case where non-controlling shareholders decide to dispose of their shares in Jeongam Wind Power Co., Ltd. after the construction of the power plant has been completed, the Group is obligated to acquire those shares at fair value.		In case non-controlling shareholders decide to dispose of their shares in Jeongam Wind Power Co., Ltd. after the construction of the power plant has been completed, the Company is obligated to acquire those shares at fair value
Significant restrictions on its abilities		Dividends can only be paid when all conditions of the loan agreement are satisfied and reimbursement to the lender can be restricted depending on the priority of the loans. Also, Shares cannot be wholly or partially transferred without consent of the stakeholders is obtained.
Korea Power Engineering Service Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Construction and service		Construction and service
Location		KOREA		KOREA
Percentage of ownership		29.00%		29.00%
Effective percentage of ownership	[2]	29.00%		29.00%
Acquisition cost		₩ 0		₩ 290
Book value
Beginning balance		4,333		3,659
Acquisition		0		0
Disposal		0		0
Dividends received		0		(218)
Share of income (loss)		508		929
Other comprehensive income (loss)		0		0
Others (book value)		(4,841)		(37)
Ending balance		₩ 0		4,333
Share in net assets				4,333
Total assets				18,609
Total liabilities				3,666
Net assets				14,943
Investment differential				0
Intercompany transaction				0
Others (consolidated FS)				0
Sales of Associates				20,809
Profit (loss) for the period of Associates				₩ 3,207
Significant restrictions on its abilities		Shares cannot be wholly or partially transferred without consent of the board of directors is obtained.
Busan Green Energy Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		29.00%		29.00%
Effective percentage of ownership	[2]	29.00%		29.00%
Acquisition cost		₩ 5,243		₩ 5,243
Book value
Beginning balance		12,537		7,363
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(1,884)		5,037
Other comprehensive income (loss)		0		0
Others (book value)		(16)		137
Ending balance		10,637		12,537
Share in net assets		10,637		12,537
Total assets		173,537		195,227
Total liabilities		136,857		151,995
Net assets		36,680		43,232
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		52,256		77,011
Profit (loss) for the period of Associates		₩ (6,496)		₩ 17,370
Gunsan Bio Energy Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities	[6]	Power generation		Power generation
Location	[6]	KOREA		KOREA
Percentage of ownership	[6]	18.87%		18.87%
Effective percentage of ownership	[2]	18.87%		18.87%
Acquisition cost	[6]	₩ 1,000		₩ 1,000
Book value
Beginning balance		0		0
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		0		0
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		0		0
Share in net assets		(3,292)		(2,202)
Total assets		10,614		8,990
Total liabilities		28,062		20,660
Net assets		(17,448)		(11,670)
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		3,292		2,202
Sales of Associates		0		0
Profit (loss) for the period of Associates		(5,777)		(4,420)
Unrecognized equity interest		1,090		916
Accumulated unrecognized equity interest		₩ 3,292		₩ 2,202
Korea Electric Vehicle Charging Service
Disclosure of associates [Line Items]
Key operation activities		Electric vehicle charge service		Electric vehicle charge service
Location		KOREA		KOREA
Percentage of ownership		28.00%		28.00%
Effective percentage of ownership	[2]	28.00%		28.00%
Acquisition cost		₩ 2,800		₩ 2,800
Book value
Beginning balance		1,593		1,749
Acquisition		0		196
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(515)		(352)
Other comprehensive income (loss)		0		0
Others (book value)		(15)		0
Ending balance		1,063		1,593
Share in net assets		1,063		1,593
Total assets		12,810		15,019
Total liabilities		9,013		9,328
Net assets		3,797		5,691
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		8,428		8,615
Profit (loss) for the period of Associates		₩ (1,841)		₩ (1,056)
Ulleungdo Natural Energy Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Renewable power generation		Renewable power generation
Location		KOREA		KOREA
Percentage of ownership		29.85%		29.85%
Effective percentage of ownership	[2]	29.85%		29.85%
Acquisition cost		₩ 0		₩ 8,000
Book value
Beginning balance		4,628		6,370
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(1)		(1,749)
Other comprehensive income (loss)		0		0
Others (book value)		(4,627)		7
Ending balance		0		4,628
Share in net assets		0		4,629
Total assets				17,134
Total liabilities				1,625
Net assets		0		15,509
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		₩ 0		(1)
Sales of Associates				0
Profit (loss) for the period of Associates				₩ (5,855)
Korea Nuclear Partners Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Electric material agency		Electric material agency
Location		KOREA		KOREA
Percentage of ownership		29.00%		29.00%
Effective percentage of ownership	[2]	29.00%		29.00%
Acquisition cost		₩ 290		₩ 290
Book value
Beginning balance		175		383
Acquisition		0	[19]	0
Disposal		0	[19]	0
Dividends received		0	[19]	0
Share of income (loss)		(79)	[19]	(208)
Other comprehensive income (loss)		0	[19]	0
Others (book value)		(96)	[19]	0
Ending balance		0	[19]	175
Share in net assets		160		175
Total assets		928		615
Total liabilities		375		12
Net assets		553		603
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		(160)		0
Sales of Associates		1,441		80
Profit (loss) for the period of Associates		₩ (50)		₩ (707)
Tamra Offshore Wind Power Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		27.00%		27.00%
Effective percentage of ownership	[2]	27.00%		27.00%
Acquisition cost		₩ 0		₩ 8,910
Book value
Beginning balance		10,401		8,560
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		0		1,841
Other comprehensive income (loss)		0		0
Others (book value)		(10,401)		0
Ending balance		0		10,401
Share in net assets		0		10,401
Total assets				170,238
Total liabilities				131,717
Net assets		0		38,521
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		₩ 0		0
Sales of Associates				21,701
Profit (loss) for the period of Associates				₩ 4,077
Korea Electric Power Corporation Fund
Disclosure of associates [Line Items]
Key operation activities	[20]	Developing electric enterprises		Developing electric enterprises
Location	[20]	KOREA		KOREA
Percentage of ownership	[20]	98.09%		98.09%
Effective percentage of ownership	[2]	98.09%		98.09%
Acquisition cost	[20]	₩ 51,500		₩ 51,500
Book value
Beginning balance		47,189		47,974
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(6,931)		(505)
Other comprehensive income (loss)		868		(280)
Others (book value)		0		0
Ending balance		41,126		47,189
Share in net assets		41,122		47,185
Total assets		42,162		48,280
Total liabilities		239		176
Net assets		41,923		48,104
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		4		4
Sales of Associates		127		1,315
Profit (loss) for the period of Associates		₩ (5,430)		₩ (649)
Energy Infra Asset Management Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities	[8]	Asset management		Asset management
Location	[8]	KOREA		KOREA
Percentage of ownership	[8]	9.90%		9.90%
Effective percentage of ownership	[2]	9.90%		9.90%
Acquisition cost	[8]	₩ 297		₩ 297
Book value
Beginning balance		665		476
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		126		189
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		791		665
Share in net assets		791		665
Total assets		8,712		7,225
Total liabilities		721		507
Net assets		7,991		6,718
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		5,118		5,757
Profit (loss) for the period of Associates		₩ 1,415		₩ 2,193
Daegu clean Energy Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Renewable power generation		Renewable power generation
Location		KOREA		KOREA
Percentage of ownership		28.00%		28.00%
Effective percentage of ownership	[2]	28.00%		28.00%
Acquisition cost		₩ 140		₩ 140
Book value
Beginning balance		17		11
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(4)		6
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		13		17
Share in net assets		13		17
Total assets		371		389
Total liabilities		323		328
Net assets		48		61
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		0		0
Profit (loss) for the period of Associates		₩ (14)		₩ (190)
YaksuESS Co., Ltd
Disclosure of associates [Line Items]
Key operation activities		Installing ESS related equipment		Installing ESS related equipment
Location		KOREA		KOREA
Percentage of ownership		29.00%		29.00%
Effective percentage of ownership	[2]	29.00%		29.00%
Acquisition cost		₩ 210		₩ 210
Book value
Beginning balance		460		194
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		56		266
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		516		460
Share in net assets		514		458
Total assets		7,325		7,525
Total liabilities		5,551		5,944
Net assets		1,774		1,581
Investment differential		2		0
Intercompany transaction		0		0
Others (consolidated FS)		0		2
Sales of Associates		1,191		2,094
Profit (loss) for the period of Associates		₩ 363		₩ 1,259
Nepal Water & Energy Development Company Private Limited
Disclosure of associates [Line Items]
Key operation activities	[21]	Construction and operation of utility plant		Construction and operation of utility plant
Location	[21]	NEPAL		NEPAL
Percentage of ownership	[21]	57.76%		57.67%
Effective percentage of ownership	[2]	58.59%		57.67%
Acquisition cost	[21]	₩ 35,571		₩ 33,577
Book value
Beginning balance		30,961		30,498
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(854)		(770)
Other comprehensive income (loss)		1,038		1,233
Others (book value)		0		0
Ending balance		31,145		30,961
Share in net assets		30,173		29,529
Total assets		78,309		55,453
Total liabilities		26,783		4,249
Net assets		51,526		51,204
Investment differential		972		972
Intercompany transaction		0		0
Others (consolidated FS)		0		460
Sales of Associates		0		0
Profit (loss) for the period of Associates		₩ (1,380)		₩ (984)
Gwangyang Green Energy Co., Ltd
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		20.00%		20.00%
Effective percentage of ownership	[2]	20.00%		20.00%
Acquisition cost		₩ 2,000		₩ 2,000
Book value
Beginning balance		1,206		1,772
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(258)		(566)
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		948		1,206
Share in net assets		930		1,188
Total assets		28,816		29,234
Total liabilities		24,164		23,293
Net assets		4,652		5,941
Investment differential		18		18
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		0		0
Profit (loss) for the period of Associates		₩ (1,007)		₩ (2,831)
PND solar., Ltd
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		29.00%		29.00%
Effective percentage of ownership	[2]	29.00%		29.00%
Acquisition cost		₩ 1,250		₩ 1,250
Book value
Beginning balance		1,020		1,250
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		124		(230)
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		1,144		1,020
Share in net assets		990		866
Total assets		40,941		42,283
Total liabilities		37,526		39,297
Net assets		3,415		2,986
Investment differential		154		154
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		6,908		1,094
Profit (loss) for the period of Associates		₩ 1,665		₩ (795)
Hyundai Eco Energy Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities	[6]	Power generation		Power generation
Location	[6]	KOREA		KOREA
Percentage of ownership	[6]	19.00%		19.00%
Effective percentage of ownership	[2]	19.00%		19.00%
Acquisition cost	[6]	₩ 3,610		₩ 3,610
Book value
Beginning balance		3,388		0
Acquisition		0		3,610
Disposal		0		0
Dividends received		0		0
Share of income (loss)		393		(222)
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		3,781		3,388
Share in net assets		3,567		3,174
Total assets		209,395		165,555
Total liabilities		190,622		148,852
Net assets		18,773		16,703
Investment differential		214		214
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		13,343		0
Profit (loss) for the period of Associates		1,306		(2,193)
Unrecognized equity interest		12,890		25,841
Accumulated unrecognized equity interest		₩ 38,731		₩ 25,841
YeongGwang Yaksu Wind Electric. Co., Ltd
Disclosure of associates [Line Items]
Key operation activities	[6]	Power generation		Power generation
Location	[6]	KOREA		KOREA
Percentage of ownership	[6]	9.63%		9.63%
Effective percentage of ownership	[2]	9.63%		9.63%
Acquisition cost	[6]	₩ 533		₩ 533
Book value
Beginning balance		533		0
Acquisition		0		533
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(147)		0
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		386		533
Share in net assets		86		233
Total assets		46,488		46,027
Total liabilities		45,594		43,606
Net assets		894		2,421
Investment differential		300		300
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		6,511		7,604
Profit (loss) for the period of Associates		₩ (1,510)		₩ (493)
Shareholders' agreements that may cause future economic resource or cash outflows		As of December 31, 2019, YeongGwang Yaksu Wind Electric. Co., Ltd., an associate of the Group, which engages in the wind power generating business in YeongGwang, Jeonra-namdo, and entered into a project financing agreement with a limit of W46 billion with Hanhwa Life Insurance Co., Ltd. and others. The Group set the shares of YeongGwang Yaksu Wind Electric. Co., Ltd. as a collateral for the the project financing to the lenders.		As of December 31, 2018, YeongGwang Yaksu Wind Electric. Co., Ltd, an associate of the Company, which engages in the wind power generating business, entered into a project financing agreement with a limit of W46.8 billion with Hanwha Life Insurance Co., Ltd. and others.
Green Energy Electricity Generation Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation
Location		KOREA
Percentage of ownership		29.00%
Effective percentage of ownership	[2]	29.00%
Acquisition cost		₩ 1,189
Book value
Acquisition		1,189
Disposal		0
Dividends received		0
Share of income (loss)		(1,026)
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		163
Share in net assets		(616)
Total assets		33,937
Total liabilities		36,060
Net assets		(2,123)
Investment differential		779
Intercompany transaction		0
Others (consolidated FS)		0
Sales of Associates		0
Profit (loss) for the period of Associates		₩ (5,923)
Korea Energy Solutions Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		R & D
Location		KOREA
Percentage of ownership		20.00%
Effective percentage of ownership	[2]	20.00%
Acquisition cost		₩ 300
Book value
Acquisition		300
Disposal		0
Dividends received		0
Share of income (loss)		(41)
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		259
Share in net assets		253
Total assets		1,285
Total liabilities		18
Net assets		1,267
Investment differential		6
Intercompany transaction		0
Others (consolidated FS)		0
Sales of Associates		134
Profit (loss) for the period of Associates		₩ (233)
ITR Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		R & D
Location		KOREA
Percentage of ownership		20.00%
Effective percentage of ownership	[2]	20.00%
Acquisition cost		₩ 50
Book value
Acquisition		50
Disposal		0
Dividends received		0
Share of income (loss)		(17)
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		33
Share in net assets		32
Total assets		376
Total liabilities		214
Net assets		162
Investment differential		1
Intercompany transaction		0
Others (consolidated FS)		0
Sales of Associates		167
Profit (loss) for the period of Associates		₩ (88)
Structure test network Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Technical testing and consulting
Location		KOREA
Percentage of ownership		20.00%
Effective percentage of ownership	[2]	20.00%
Acquisition cost		₩ 25
Book value
Acquisition		25
Disposal		0
Dividends received		0
Share of income (loss)		(4)
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		21
Share in net assets		(32)
Total assets		89
Total liabilities		249
Net assets		(160)
Investment differential		53
Intercompany transaction		0
Others (consolidated FS)		0
Sales of Associates		76
Profit (loss) for the period of Associates		₩ (72)
Namjeongsusang Solar Power Operation Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities	[22]	Power generation
Location	[22]	KOREA
Percentage of ownership	[22]	15.00%
Effective percentage of ownership	[2]	15.00%
Acquisition cost	[22]	₩ 969
Book value
Acquisition		969
Disposal		0
Dividends received		0
Share of income (loss)		(157)
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		812
Share in net assets		793
Total assets		34,595
Total liabilities		29,310
Net assets		5,285
Investment differential		19
Intercompany transaction		0
Others (consolidated FS)		0
Sales of Associates		0
Profit (loss) for the period of Associates		₩ (1,149)
Indeck Niles Development, LLC
Disclosure of associates [Line Items]
Key operation activities		Power generation
Location		USA
Percentage of ownership		50.00%
Effective percentage of ownership	[2]	50.00%
Acquisition cost		₩ 0
Book value
Acquisition		0
Disposal		0
Dividends received		0
Share of income (loss)		0
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		0
Share in net assets		24,646
Total assets		49,465
Total liabilities		174
Net assets		49,291
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		(24,646)
Sales of Associates		0
Profit (loss) for the period of Associates		₩ (25,430)
Significant restrictions on its abilities		Shares cannot be wholly or partially transferred without consent of the stakeholders is obtained.
Indeck Niles Asset Management, LLC
Disclosure of associates [Line Items]
Key operation activities	[23]	Power generation
Location	[23]	USA
Percentage of ownership	[23]	33.33%
Effective percentage of ownership	[2]	33.33%
Acquisition cost	[23]	₩ 0
Book value
Acquisition		0
Disposal		0
Dividends received		(245)
Share of income (loss)		333
Other comprehensive income (loss)		(1)
Others (book value)		0
Ending balance		87
Share in net assets		87
Total assets		271
Total liabilities		9
Net assets		262
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		0
Sales of Associates		1,513
Profit (loss) for the period of Associates		₩ 753
Significant restrictions on its abilities		Shares cannot be wholly or partially transferred without consent of the stakeholders is obtained.
Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1
Disclosure of associates [Line Items]
Key operation activities		Holding company
Location		KOREA
Percentage of ownership		49.00%
Effective percentage of ownership	[2]	49.00%
Acquisition cost		₩ 7,105
Book value
Acquisition		7,105
Disposal		0
Dividends received		0
Share of income (loss)		21
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		7,126
Share in net assets		7,126
Total assets		14,559
Total liabilities		15
Net assets		14,544
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		0
Sales of Associates		59
Profit (loss) for the period of Associates		₩ 44
Suwon New Power Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation
Location		KOREA
Percentage of ownership		39.90%
Effective percentage of ownership	[2]	33.10%
Acquisition cost		₩ 798
Book value
Acquisition		798
Disposal		0
Dividends received		0
Share of income (loss)		0
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		798
Share in net assets		662
Total assets		2,000
Total liabilities		0
Net assets		2,000
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		136
Sales of Associates		0
Profit (loss) for the period of Associates		₩ 0
KPGE Inc.
Disclosure of associates [Line Items]
Key operation activities		Power generation materials business
Location		KOREA
Percentage of ownership		29.00%
Effective percentage of ownership	[2]	29.00%
Acquisition cost		₩ 287
Book value
Acquisition		287
Disposal		0
Dividends received		0
Share of income (loss)		0
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		287
Share in net assets		285
Total assets		984
Total liabilities		0
Net assets		984
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		2
Sales of Associates		0
Profit (loss) for the period of Associates		₩ (6)
Significant restrictions on its abilities		Shares cannot be wholly or partially transferred without consent of the stakeholders is obtained.
Gwangbaek Solar Power Investment Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities	[24]	Power generation
Location	[24]	KOREA
Percentage of ownership	[24]	19.00%
Effective percentage of ownership	[2]	19.00%
Acquisition cost	[24]	₩ 2,054
Book value
Acquisition		2,054
Disposal		0
Dividends received		0
Share of income (loss)		0
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		2,054
Share in net assets		1,976
Total assets		193,464
Total liabilities		183,063
Net assets		10,401
Investment differential		78
Intercompany transaction		0
Others (consolidated FS)		0
Sales of Associates		7,635
Profit (loss) for the period of Associates		₩ (355)
Goduk Clean Energy Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities	[25]	Fuel cell generation
Location	[25]	KOREA
Percentage of ownership	[25]	61.00%
Effective percentage of ownership	[2]	61.00%
Acquisition cost	[25]	₩ 1,830
Book value
Acquisition		1,830
Disposal		0
Dividends received		0
Share of income (loss)		0
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		1,830
Share in net assets		1,830
Total assets		3,000
Total liabilities		0
Net assets		3,000
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		0
Sales of Associates		0
Profit (loss) for the period of Associates		₩ 0
[1]	The effective percentage of ownership is 21.57% considering treasury stocks.
[2]	The percentage of ownership shown above is after considering the treasury stocks and others.
[3]	An indicator of impairment has been identified for the Company's investment in Korea Gas Corporation ("KOGAS") for the years ended December 31, 2018 and 2019 as management determined that the carrying amount of the investment in KOGAS at KRW1,701,848 million and KRW1,693,967 million respectively were significantly higher than its fair value. Accordingly, management has assessed the recoverable amount of the investment by estimating the Company's share of the present value of the estimated future cash flows expected to be generated by KOGAS. The carrying amount of KOGAS as at December 31, 2018 and 2019 are supported by the recoverable amount determination and as such, no impairment has been recognized for the years ended December 31, 2018 and 2019. The recoverable amount estimate is most sensitive to assumptions regarding long-term revenue forecasts as well as the discount rate: - Revenue forecasts: price and volume of gas sold are based on the long-term natural gas supply and demand programs approved by the Ministry of Trade, Industry & Energy. - Discount rate: the discount rate is derived using the weighted average cost of capital methodology adjusted for any risks that are not reflected in the underlying cash flows. A real post-tax discount rate of 4.80% and 4.70% was applied to post-tax cash flows respectively as at December 31, 2018 and 2019. Changes in circumstances may affect the assumptions used to determine recoverable amount and could result in an impairment of KOGAS at future reporting dates.
[4]	The profit recognized for the years ended December 31, 2018 and 2019 are reduced by the associate entity's net income attributable to non-controlling interests.
[5]	The profit recognized for the years ended December 31, 2018 and 2019 are reduced by of the associate entity's net income attributable to non-controlling interests.
[6]	The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint directors to the board of directors of the entity, and by strict decision criteria of the Company's financial and operating policy of the board of directors.
[7]	The effective percentage of ownership is 100%. However, the Government regulates the Company's ability to make operating and financial decisions over the entity, as the Government requires maintaining arms-length transactions between KPX and the Company's other subsidiaries. The Company can exercise significant influence by its right to nominate directors to the board of directors of the entity.
[8]	The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint a director to the board of directors of the entity.
[9]	As of December 31, 2018, 15.64% of ownership of Hyundai Energy Co., Ltd. is held by NH Power ll Co., Ltd. and NH Bank. According to the shareholders' agreement reached on March 2011, not only does the Company have a call option to acquire the investment in Hyundai Energy Co., Ltd. from NH Power ll Co., Ltd. and NH Bank with a certain rate of return, NH Power ll Co., Ltd. and NH Bank also have put options to dispose of their investment to the Company. In connection with this agreement, the Company applied the equity method on the investment in Hyundai Energy Co., Ltd. with 46.30% of ownership.
[10]	It was determined that there is objective evidence of impairment due to prolonged operating losses. As a result, the Company recognized an impairment loss of KRW820 million in impairment loss on investments in associates and joint ventures for the year ended December 31, 2018.
[11]	The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint one out of four members of the steering committee of the entity. Moreover, the Company has significant financial transactions, which can affect its influence on the entity.
[12]	As of reporting date, the annual reporting period of all associates and joint ventures ends on December 31, except for Pioneer Gas Power Limited whose reporting period ends on March 31.
[13]	The effective percentage of ownership is less than 20% but the Company can exercise significant influence by virtue of its contractual right to appoint a director to the board of directors of the entity and the fact that the dominant portion of the investee's sales transactions is generated from the Company.
[14]	The Company's effective percentage of ownership excluding the redeemable convertible preferred stock is 25.54%.
[15]	It was determined that there is objective evidence of impairment due to prolonged operating losses. As a result, the Company recognized an impairment loss of KRW7,087 million in impairment loss on investments in associates and joint ventures for the year ended December 31, 2018.
[16]	The effective percentage of ownership is 34.01% considering the conversion of redeemable convertible preferred stock into ordinary stock.
[17]	The effective percentage of ownership is 34.01% considering redeemable convertible preferred stock.
[18]	Daejung Offshore Wind Power Co., Ltd. and GS Donghae Electric Power Co., Ltd. are reclassified from joint ventures to associates, and Jeongam Wind Power Co., Ltd. and Korea Power Engineering Service Co., Ltd. are reclassified from associates to joint ventures during the year ended December 31, 2019.
[19]	It was determined that there is objective evidence of impairment due to prolonged operating losses. As a result, the Company recognized an impairment loss of KRW96 million in impairment loss on investments in associates and joint ventures for the year ended December 31, 2019.
[20]	The effective percentage of ownership is more than 50% but the Company does not hold control over relevant business while it exercises significant influence by participating in the Investment Decision Committee. For this reason, the entity is classified as an associate.
[21]	The effective percentage of ownership is more than 50% but the Company does not hold control over the entity according to the shareholders' agreement. For this reason, the entity is classified as an associate.
[22]	The effective percentage of ownership is less than 20%. However, the Company considers the major decision-making body to be the general decision of the board of directors, and the general decision of the board of directors can be passed only by two directors. For this reason, the entities are classified as an associate.
[23]	Although the investment amount is not paid as of December 31, 2019, the Company has an investment agreement on 50% of the interests. the Company can exercise significant influence by virtue of its contractual right to appoint a director to the board of directors of the entity.
[24]	The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint a director to the board of directors of the entity.
[25]	The effective percentage of ownership is 61%. However, it seems the Company doesn't have power on the Goduk Clean Energy Co., Ltd. due to its proportion to make decisions, which is less than 50%. The Company can exercise significant influence on the entity by participating in the board of directors and others. Therefore, the entity is classified as an associate.

Investments in Joint Ventures (

Investments in Joint Ventures (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2019		Dec. 31, 2018
Disclosure of joint ventures [Line Items]
Acquisition cost		₩ 1,475,696		₩ 1,647,317
Book value [Abstract]
Beginning balance		1,813,525		1,493,275
Acquisition		90,162		237,142
Disposal		(5,359)		(1,632)
Dividends received		(79,601)		(102,126)
Share of income (loss)		129,402		147,092
Other comprehensive income (loss)		(22,189)		40,985
Others (book value)		(262,911)		(1,211)
Ending balance		₩ 1,663,029		₩ 1,813,525
KEPCO-Uhde Inc.
Disclosure of joint ventures [Line Items]
Key operation activities	[1]	Power generation		Power generation
Location	[1]	KOREA		KOREA
Percentage of ownership	[1]	52.80%		52.80%
Effective percentage of ownership	[2]	50.80%		50.85%	[1]
Acquisition cost	[1]	₩ 11,355		₩ 11,355
Book value [Abstract]
Beginning balance		188		258
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(54)		(70)
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		134		188
Share in net assets		134		188
Total assets		270		403
Total liabilities		7		34
Net assets		263		369
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		0		18
Profit (loss) for the period of JointVentures		(107)		₩ (139)
Eco Biomass Energy Sdn. Bhd.
Disclosure of joint ventures [Line Items]
Key operation activities				Power generation
Location				MALAYSIA
Percentage of ownership				61.53%
Effective percentage of ownership	[2]			61.53%
Acquisition cost				₩ 14,439
Book value [Abstract]
Beginning balance		0		0
Acquisition				0
Disposal				0
Dividends received				0
Share of income (loss)				0
Other comprehensive income (loss)				0
Others (book value)				0
Ending balance				0
Share in net assets				0
Total assets				0
Total liabilities				0
Net assets				0
Investment differential				0
Intercompany transaction				0
Others (consolidated FS)				0
Sales of JointVentures				0
Profit (loss) for the period of JointVentures				0
Datang Chaoyang Renewable Power Co., Ltd.
Book value [Abstract]
Beginning balance		₩ 0	[3]	27,262
Acquisition	[3]			0
Disposal	[3]			0
Dividends received	[3]			0
Share of income (loss)	[3]			743
Other comprehensive income (loss)	[3]			1,009
Others (book value)	[3]			(29,014)
Ending balance	[3]			₩ 0
Shuweihat Asia Power Investment B.V.
Disclosure of joint ventures [Line Items]
Key operation activities		Holding company		Holding company
Location		NETHERLANDS		NETHERLANDS
Percentage of ownership		49.00%		49.00%
Effective percentage of ownership	[2]	49.00%		49.00%
Acquisition cost		₩ 44,405		₩ 44,405
Book value [Abstract]
Beginning balance		27,251		15,675
Acquisition		0		0
Disposal		0		(1,632)
Dividends received		(2,176)		(499)
Share of income (loss)		5,288		3,075
Other comprehensive income (loss)		(12,045)		10,632
Others (book value)		0		0
Ending balance		18,318		27,251
Share in net assets		18,318		27,251
Total assets		37,389		55,614
Total liabilities		5		0
Net assets		37,384		1,441
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		0		0
Profit (loss) for the period of JointVentures		₩ (159)		₩ (187)
Shuweihat Asia Operation & Maintenance Company
Disclosure of joint ventures [Line Items]
Key operation activities	[1]	Maintenance of utility plant		Maintenance of utility plant
Location	[1]	CAYMAN		CAYMAN
Percentage of ownership	[1]	55.00%		55.00%
Effective percentage of ownership	[2]	55.00%		55.00%	[1]
Acquisition cost	[1]	₩ 30		₩ 30
Book value [Abstract]
Beginning balance		792		663
Acquisition		0		0
Disposal		0		0
Dividends received		(907)		(859)
Share of income (loss)		1,040		946
Other comprehensive income (loss)		(1)		42
Others (book value)		484		0
Ending balance		1,408		792
Share in net assets		1,408		793
Total assets		2,605		1,472
Total liabilities		45		31
Net assets		2,560
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		(1)
Sales of JointVentures		2,570		2,391
Profit (loss) for the period of JointVentures		₩ 1,892		₩ 1,719
Waterbury Lake Uranium L.P.
Disclosure of joint ventures [Line Items]
Key operation activities		Resources development		Resources development
Location		CANADA		CANADA
Percentage of ownership		33.48%		34.07%
Effective percentage of ownership	[2]	33.41%		34.07%
Acquisition cost		₩ 26,602		₩ 26,602
Book value [Abstract]
Beginning balance		19,032		19,781
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		22		(3)
Other comprehensive income (loss)		1,508		(746)
Others (book value)		0		0
Ending balance		20,562		19,032
Share in net assets		20,562		19,032
Total assets		61,548		55,933
Total liabilities		4		64
Net assets		61,544		55,869
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		0		0
Profit (loss) for the period of JointVentures		₩ 0		₩ 0
ASM-BG Investicii AD
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		BULGARIA		BULGARIA
Percentage of ownership		50.00%		50.00%
Effective percentage of ownership	[2]	50.00%		50.00%
Acquisition cost		₩ 16,101		₩ 16,101
Book value [Abstract]
Beginning balance		21,379		21,202
Acquisition		0		0
Disposal		0		0
Dividends received		(4,760)		(1,039)
Share of income (loss)		2,442		2,236
Other comprehensive income (loss)		315		(1,020)
Others (book value)		0		0
Ending balance		19,376		21,379
Share in net assets		19,376		21,379
Total assets		78,191		84,924
Total liabilities		39,439		42,166
Net assets		38,752		42,758
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		13,200		12,745
Profit (loss) for the period of JointVentures		₩ 4,894		₩ 4,406
RES Technology AD
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		BULGARIA		BULGARIA
Percentage of ownership		50.00%		50.00%
Effective percentage of ownership	[2]	50.00%		50.00%
Acquisition cost		₩ 15,595		₩ 15,595
Book value [Abstract]
Beginning balance		15,209		14,375
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		963		812
Other comprehensive income (loss)		76		22
Others (book value)		0		0
Ending balance		16,248		15,209
Share in net assets		16,248		15,209
Total assets		66,821		69,609
Total liabilities		34,325		39,192
Net assets		32,496		30,417
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		8,384		7,879
Profit (loss) for the period of JointVentures		₩ 1,914		₩ 1,567
KV Holdings, Inc.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		PHILIPPINES		PHILIPPINES
Percentage of ownership		40.00%		40.00%
Effective percentage of ownership	[2]	40.00%		40.00%
Acquisition cost		₩ 2,103		₩ 2,103
Book value [Abstract]
Beginning balance		1,918		1,918
Acquisition		0		0
Disposal		0		0
Dividends received		(372)		(735)
Share of income (loss)		751		772
Other comprehensive income (loss)		144		(37)
Others (book value)		0		0
Ending balance		2,441		1,918
Share in net assets		2,441		1,918
Total assets		6,101		4,795
Total liabilities		0		0
Net assets		6,101		4,795
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		25		8
Profit (loss) for the period of JointVentures		₩ 1,876		₩ 1,257
KEPCO SPC Power Corporation
Disclosure of joint ventures [Line Items]
Key operation activities	[1]	Construction and operation of utility plant		Construction and operation of utility plant
Location	[1]	PHILIPPINES		PHILIPPINES
Percentage of ownership	[1]	75.20%		75.20%
Effective percentage of ownership	[2]	75.20%		75.20%	[1]
Acquisition cost	[1]	₩ 94,579		₩ 94,579
Book value [Abstract]
Beginning balance		208,306		217,094
Acquisition		0		0
Disposal		0		0
Dividends received		(45,349)		(41,601)
Share of income (loss)		48,043		44,909
Other comprehensive income (loss)		3,781		(12,092)
Others (book value)		13		(4)
Ending balance		214,794		208,306
Share in net assets		214,794		208,306
Total assets		308,274		312,093
Total liabilities		22,643		35,091
Net assets		285,631		277,002
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		187,867		184,046
Profit (loss) for the period of JointVentures		₩ 64,152		₩ 59,543
Gansu Datang Yumen Wind Power Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		CHINA		CHINA
Percentage of ownership		40.00%		40.00%
Effective percentage of ownership	[2]	40.00%		40.00%
Acquisition cost		₩ 16,621		₩ 16,621
Book value [Abstract]
Beginning balance		9,981		10,840
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(2,050)		(818)
Other comprehensive income (loss)		218		(41)
Others (book value)		0		0
Ending balance		8,149		9,981
Share in net assets		8,149		9,981
Total assets		77,313		79,354
Total liabilities		56,941		54,402
Net assets		20,372		24,952
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		6,106		8,323
Profit (loss) for the period of JointVentures		₩ (5,175)		₩ (2,046)
Datang Chifeng Renewable Power
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		CHINA		CHINA
Percentage of ownership		40.00%		40.00%
Effective percentage of ownership	[2]	40.00%		40.00%
Acquisition cost		₩ 121,928		₩ 121,928
Book value [Abstract]
Beginning balance		166,162		171,055
Acquisition		0		0
Disposal		0		0
Dividends received		0		(18,859)
Share of income (loss)		16,325		14,808
Other comprehensive income (loss)		2,820		(842)
Others (book value)		0		0
Ending balance		185,307		166,162
Share in net assets		185,307		166,211
Total assets		765,598		751,551
Total liabilities		302,329		336,024
Net assets		463,269		415,527
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		(49)
Sales of JointVentures		122,398		117,270
Profit (loss) for the period of JointVentures		₩ 40,371		₩ 37,159
Datang KEPCO Chaoyang Renewable Power Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		CHINA		CHINA
Percentage of ownership		40.00%		40.00%
Effective percentage of ownership	[2]	40.00%		40.00%
Acquisition cost		₩ 10,858		₩ 10,858
Book value [Abstract]
Beginning balance		39,442	[3]	11,060
Acquisition		0		0	[3]
Disposal		0		0	[3]
Dividends received		0		0	[3]
Share of income (loss)		875		582	[3]
Other comprehensive income (loss)		707		(1,214)	[3]
Others (book value)		0		29,014	[3]
Ending balance		41,024		39,442	[3]
Share in net assets		41,024		39,442
Total assets		189,157		190,951
Total liabilities		86,596		92,347
Net assets		102,561		98,604
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		23,910		18,824
Profit (loss) for the period of JointVentures		₩ 2,188		₩ 2,557
Rabigh Electricity Company
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		SAUDI ARABIA		SAUDI ARABIA
Percentage of ownership		40.00%		40.00%
Effective percentage of ownership	[2]	40.00%		40.00%
Acquisition cost		₩ 109,743		₩ 109,743
Book value [Abstract]
Beginning balance		105,328		99,356
Acquisition		0		0
Disposal		0		0
Dividends received		0		(29,067)
Share of income (loss)		4,355		13,305
Other comprehensive income (loss)		(1,734)		22,371
Others (book value)		1,147		(637)
Ending balance		109,096		105,328
Share in net assets		175,349		178,256
Total assets		2,538,719		2,448,690
Total liabilities		2,100,347		2,003,050
Net assets		438,372		445,640
Investment differential		0		0
Intercompany transaction		(65,450)		(70,977)
Others (consolidated FS)		(803)		(1,951)
Sales of JointVentures		208,514		274,184
Profit (loss) for the period of JointVentures		₩ 1,567		₩ 38,789
Rabigh Operation & Maintenance Company
Disclosure of joint ventures [Line Items]
Key operation activities		Maintenance of utility plant		Maintenance of utility plant
Location		SAUDI ARABIA		SAUDI ARABIA
Percentage of ownership		40.00%		40.00%
Effective percentage of ownership	[2]	40.00%		40.00%
Acquisition cost		₩ 70		₩ 70
Book value [Abstract]
Beginning balance		5,834		3,987
Acquisition		0		0
Disposal		0		0
Dividends received		(2,222)		(1,147)
Share of income (loss)		3,070		2,820
Other comprehensive income (loss)		197		174
Others (book value)		0		0
Ending balance		6,879		5,834
Share in net assets		6,879		5,834
Total assets		36,121		26,172
Total liabilities		18,923		11,587
Net assets		17,198		14,585
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		23,777		26,387
Profit (loss) for the period of JointVentures		₩ 7,203		₩ 7,173
Jamaica Public Service Company Limited
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		JAMAICA		JAMAICA
Percentage of ownership		40.00%		40.00%
Effective percentage of ownership	[2]	40.00%		40.00%
Acquisition cost		₩ 301,910		₩ 301,910
Book value [Abstract]
Beginning balance		239,632		221,153
Acquisition		0		0
Disposal		0		0
Dividends received		(4,631)		(4,472)
Share of income (loss)		10,166		13,099
Other comprehensive income (loss)		8,440		9,852
Others (book value)		0		0
Ending balance		253,607		239,632
Share in net assets		240,976		227,434
Total assets		1,543,049		1,396,421
Total liabilities		940,609		827,837
Net assets		602,440		568,584
Investment differential		(80,161)		(80,161)
Intercompany transaction		0		0
Others (consolidated FS)		92,792		92,359
Sales of JointVentures		1,035,399		992,677
Profit (loss) for the period of JointVentures		₩ 32,828		₩ 32,507
KW Nuclear Components Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Manufacturing		Manufacturing
Location		KOREA		KOREA
Percentage of ownership		45.00%		45.00%
Effective percentage of ownership	[2]	45.00%		45.00%
Acquisition cost		₩ 833		₩ 833
Book value [Abstract]
Beginning balance		7,708		6,703
Acquisition		0		0
Disposal		0		0
Dividends received		(208)		(208)
Share of income (loss)		1,552		1,213
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		9,052		7,708
Share in net assets		9,228		7,884
Total assets		31,326		24,598
Total liabilities		10,820		7,077
Net assets		20,506		17,521
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		(176)		(176)
Sales of JointVentures		11,305		6,031
Profit (loss) for the period of JointVentures		₩ 3,837		₩ 2,543
Busan Shinho Solar Power Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		25.00%		25.00%
Effective percentage of ownership	[2]	25.00%		25.00%
Acquisition cost		₩ 2,100		₩ 2,100
Book value [Abstract]
Beginning balance		4,761		4,346
Acquisition		0		0
Disposal		0		0
Dividends received		(430)		(340)
Share of income (loss)		714		755
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		5,045		4,761
Share in net assets		5,045		4,761
Total assets		42,318		45,538
Total liabilities		22,137		26,494
Net assets		20,181		19,044
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		7,843		7,901
Profit (loss) for the period of JointVentures		₩ 2,856		₩ 3,018
GS Donghae Electric Power Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		0.00%		34.00%
Effective percentage of ownership	[2]	0.00%		34.00%
Acquisition cost		₩ 0		₩ 204,000
Book value [Abstract]
Beginning balance		240,591		220,727
Acquisition		0		0
Disposal		0		0
Dividends received		(10,200)		0
Share of income (loss)		25,787		20,061
Other comprehensive income (loss)		0		0
Others (book value)		(256,178)		(197)
Ending balance		0		240,591
Share in net assets		0		240,591
Total assets		0		2,259,129
Total liabilities		0		1,551,509
Net assets		0		707,620
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		0		787,425
Profit (loss) for the period of JointVentures		₩ 0		₩ 58,976
Global Trade Of Power System Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Exporting products and technology of small or medium business by proxy		Exporting products and technology of small or medium business by proxy
Location		KOREA		KOREA
Percentage of ownership		29.00%		29.00%
Effective percentage of ownership	[2]	29.00%		29.00%
Acquisition cost		₩ 290		₩ 290
Book value [Abstract]
Beginning balance		515		577
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		56		(62)
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		571		515
Share in net assets		571		515
Total assets		2,993		2,039
Total liabilities		1,025		263
Net assets		1,968		1,776
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		3,323		1,368
Profit (loss) for the period of JointVentures		₩ 134		₩ (134)
Expressway Solar-light Power Generation Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		29.00%		29.00%
Effective percentage of ownership	[2]	29.00%		29.00%
Acquisition cost		₩ 1,856		₩ 1,856
Book value [Abstract]
Beginning balance		2,676		2,463
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		207		213
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		2,883		2,676
Share in net assets		2,883		2,676
Total assets		17,653		18,443
Total liabilities		7,712		9,215
Net assets		9,941		9,228
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		2,991		2,986
Profit (loss) for the period of JointVentures		709		692
KODE NOVUS I LLC
Book value [Abstract]
Other comprehensive income (loss)	[4]			1,374
Others (book value)	[4]			(1,374)
KODE NOVUS II LLC
Book value [Abstract]
Other comprehensive income (loss)	[5]			810
Others (book value)	[5]			₩ (810)
Daejung Offshore Wind Power Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities				Power generation
Location				KOREA
Percentage of ownership				49.90%
Effective percentage of ownership	[2]			49.90%
Acquisition cost				₩ 0
Book value [Abstract]
Beginning balance		2,669		2,669
Acquisition				0
Disposal				0
Dividends received				0
Share of income (loss)		(308)		(300)
Other comprehensive income (loss)				0
Others (book value)		₩ (2,361)
Ending balance				2,669
Share in net assets				0
Total assets				0
Total liabilities				0
Net assets				0
Investment differential				0
Intercompany transaction				0
Others (consolidated FS)				0
Sales of JointVentures				0
Profit (loss) for the period of JointVentures				₩ 0
Significant restrictions on its abilities				Before the commencement of the operation, shares cannot be wholly or partially transferred without consent of the stakeholders is obtained.
Amman Asia Electric Power Company
Disclosure of joint ventures [Line Items]
Key operation activities	[1]	Power generation		Power generation
Location	[1]	JORDAN		JORDAN
Percentage of ownership	[1]	60.00%		60.00%
Effective percentage of ownership	[2]	60.00%		60.00%	[1]
Acquisition cost	[1]	₩ 111,476		₩ 111,476
Book value [Abstract]
Beginning balance		177,357		145,676
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		20,648		19,604
Other comprehensive income (loss)		(5,841)		12,077
Others (book value)		0		0
Ending balance		192,164		177,357
Share in net assets		192,164		177,445
Total assets		821,997		792,532
Total liabilities		501,723		496,791
Net assets		320,274		295,741
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		(88)
Sales of JointVentures		23,866		23,676
Profit (loss) for the period of JointVentures		₩ 34,424		₩ 32,674
KAPES, Inc.
Disclosure of joint ventures [Line Items]
Key operation activities	[1]	R&D		R&D
Location	[1]	KOREA		KOREA
Percentage of ownership	[1]	51.00%		51.00%
Effective percentage of ownership	[2]	51.00%		51.00%	[1]
Acquisition cost	[1]	₩ 5,629		₩ 5,629
Book value [Abstract]
Beginning balance		9,079		7,476
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		1,767		1,543
Other comprehensive income (loss)		0		0
Others (book value)		(14)		60
Ending balance		10,832		9,079
Share in net assets		10,832		9,079
Total assets		124,396		82,494
Total liabilities		103,158		64,691
Net assets		21,238		17,803
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		93,831		57,047
Profit (loss) for the period of JointVentures		₩ 3,465		₩ 4,710
Dangjin Eco Power Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		0.00%		34.00%
Effective percentage of ownership	[2]	0.00%		34.00%
Acquisition cost		₩ 0		₩ 61,540
Book value [Abstract]
Beginning balance		19,912		57,928
Acquisition		0		0
Disposal		(5,359)		0
Dividends received		0		0
Share of income (loss)		(657)		(38,042)
Other comprehensive income (loss)		16		(65)
Others (book value)		(13,912)		91
Ending balance		0		19,912
Share in net assets		0		17,294
Total assets		0		51,125
Total liabilities		0		260
Net assets		0		50,865
Investment differential		0		2,618
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		0		0
Profit (loss) for the period of JointVentures		₩ 0		₩ (111,789)
Honam Wind Power Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		29.00%		29.00%
Effective percentage of ownership	[2]	29.00%		29.00%
Acquisition cost		₩ 3,480		₩ 3,480
Book value [Abstract]
Beginning balance		4,860		4,302
Acquisition		0		0
Disposal		0		0
Dividends received		(587)		(348)
Share of income (loss)		102		906
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		4,375		4,860
Share in net assets		4,343		4,828
Total assets		39,680		43,713
Total liabilities		24,703		27,066
Net assets		14,977		16,647
Investment differential		32		32
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		5,365		7,700
Profit (loss) for the period of JointVentures		₩ 354		₩ 3,122
Chun-cheon Energy Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		29.90%		29.90%
Effective percentage of ownership	[2]	29.90%		29.90%
Acquisition cost		₩ 52,700		₩ 52,700
Book value [Abstract]
Beginning balance		42,505		48,118
Acquisition		0	[6]	0
Disposal		0	[6]	0
Dividends received		0	[6]	0
Share of income (loss)		(7,385)	[6]	(5,613)
Other comprehensive income (loss)		0	[6]	0
Others (book value)		(248)	[6]	0
Ending balance		34,872	[6]	42,505
Share in net assets		35,117		42,502
Total assets		607,823		666,050
Total liabilities		490,375		523,904
Net assets		117,448		142,146
Investment differential		0		3
Intercompany transaction		0		0
Others (consolidated FS)		(245)		0
Sales of JointVentures		313,438		320,950
Profit (loss) for the period of JointVentures		₩ (24,490)		₩ (19,133)
Yeonggwangbaeksu Wind Power Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation	[7]
Location		KOREA		KOREA	[7]
Percentage of ownership		15.00%		15.00%	[7]
Effective percentage of ownership	[2]	15.00%		15.00%	[7]
Acquisition cost		₩ 3,000		₩ 3,000	[7]
Book value [Abstract]
Beginning balance		2,843		2,734
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		197		109
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		3,040		2,843
Share in net assets		3,035		2,837
Total assets		99,552		99,368
Total liabilities		79,322		80,450
Net assets		20,230		18,918
Investment differential		5		6
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		11,739		11,366
Profit (loss) for the period of JointVentures		₩ 1,342		₩ 734
Nghi Son 2 Power LLC
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		VIETNAM		VIETNAM
Percentage of ownership		50.00%		50.00%
Effective percentage of ownership	[2]	50.00%		50.00%
Acquisition cost		₩ 2,781		₩ 2,781
Book value [Abstract]
Beginning balance		0		183
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		0		2,657
Other comprehensive income (loss)		0		(2,840)
Others (book value)		0		0
Ending balance		0		0
Share in net assets		(102,825)		(41,660)
Total assets		1,589,928		477,947
Total liabilities		1,795,578		561,266
Net assets		(205,650)		(83,319)
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		102,825		41,660
Sales of JointVentures		1,008,326		144,381
Profit (loss) for the period of JointVentures		71,803		8,979
Unrecognized equity interest		61,165		41,659
Accumulated unrecognized equity interest		₩ 102,824		₩ 41,659
Kelar S.A
Disclosure of joint ventures [Line Items]
Key operation activities	[1]	Power generation		Power generation
Location	[1]	CHILE		CHILE
Percentage of ownership	[1]	65.00%		65.00%
Effective percentage of ownership	[2]	65.00%		65.00%	[1]
Acquisition cost	[1]	₩ 78,060		₩ 78,060
Book value [Abstract]
Beginning balance		72,824		67,233
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		3,435		2,732
Other comprehensive income (loss)		(8,416)		2,859
Others (book value)		2,619		0
Ending balance		70,462		72,824
Share in net assets		67,794		70,246
Total assets		634,633		626,206
Total liabilities		530,335		518,135
Net assets		104,298		108,071
Investment differential		2,668		2,470
Intercompany transaction		0		0
Others (consolidated FS)		0		108
Sales of JointVentures		86,702		87,507
Profit (loss) for the period of JointVentures		₩ 8,867		₩ 8,587
Significant restrictions on its abilities		Dividends can only be paid when all conditions of the loan agreement are satisfied. Also, Shares cannot be wholly or partially transferred without consent of the stakeholders is obtained
PT. Tanjung Power Indonesia
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		INDONESIA		INDONESIA
Percentage of ownership		35.00%		35.00%
Effective percentage of ownership	[2]	35.00%		35.00%
Acquisition cost		₩ 26,892		₩ 746
Book value [Abstract]
Beginning balance		7,081		1,776
Acquisition		26,146		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		5,601		3,373
Other comprehensive income (loss)		(4,489)		1,928
Others (book value)		(12)		4
Ending balance		34,327		7,081
Share in net assets		34,327		7,081
Total assets		654,365		505,551
Total liabilities		556,287		485,321
Net assets		98,078		20,230
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		109,825		109,029
Profit (loss) for the period of JointVentures		₩ 16,489		₩ 9,717
Incheon New Power Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		29.00%		29.00%
Effective percentage of ownership	[2]	29.00%		29.00%
Acquisition cost		₩ 461		₩ 461
Book value [Abstract]
Beginning balance		579		619
Acquisition		0	[8]	0
Disposal		0	[8]	0
Dividends received		0	[8]	(41)
Share of income (loss)		(232)	[8]	1
Other comprehensive income (loss)		0	[8]	0
Others (book value)		(347)	[8]	0
Ending balance		0	[8]	579
Share in net assets		347		579
Total assets		4,749		6,559
Total liabilities		3,553		4,563
Net assets		1,196		1,996
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		(347)		0
Sales of JointVentures		1,951		2,687
Profit (loss) for the period of JointVentures		₩ (800)		₩ 3
Seokmun Energy Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		29.00%		29.00%
Effective percentage of ownership	[2]	29.00%		29.00%
Acquisition cost		₩ 15,370		₩ 15,370
Book value [Abstract]
Beginning balance		16,751		13,786
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		591		2,965
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		17,342		16,751
Share in net assets		17,342		16,751
Total assets		242,332		253,544
Total liabilities		182,533		195,782
Net assets		59,799		57,762
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		44,733		50,052
Profit (loss) for the period of JointVentures		₩ 2,606		₩ 10,224
Daehan Wind Power PSC
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		JORDAN		JORDAN
Percentage of ownership		50.00%		50.00%
Effective percentage of ownership	[2]	50.00%		50.00%
Acquisition cost		₩ 3,191		₩ 3,191
Book value [Abstract]
Beginning balance		1,632		0
Acquisition		0		2,288
Disposal		0		0
Dividends received		0		0
Share of income (loss)		66		(1,311)
Other comprehensive income (loss)		59		37
Others (book value)		0		618
Ending balance		1,757		1,632
Share in net assets		1,757		1,632
Total assets		89,904		33,081
Total liabilities		86,390		29,817
Net assets		3,514		3,264
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		0		0
Profit (loss) for the period of JointVentures		(767)		(1,799)
Unrecognized equity interest		0
Unrecognized equity interest				(412)
Accumulated unrecognized equity interest		₩ 0		₩ 0
Significant restrictions on its abilities		Dividends can only be paid when all conditions of the loan agreement are satisfied. Also, Shares cannot be wholly or partially transferred without consent of the stakeholders is obtained.
Barakah One Company
Disclosure of joint ventures [Line Items]
Key operation activities	[9]	Power generation		Power generation
Location	[9]	UAE		UAE
Percentage of ownership	[9]	18.00%		18.00%
Effective percentage of ownership	[2]	18.00%		18.00%	[9]
Acquisition cost	[9]	₩ 118		₩ 118
Book value [Abstract]
Beginning balance		3,807		626
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(2,668)		2,162
Other comprehensive income (loss)		(1,139)		1,019
Others (book value)		0		0
Ending balance		0		3,807
Share in net assets		(38,842)		3,807
Total assets		24,330,632		21,480,187
Total liabilities		24,546,421		21,459,035
Net assets		(215,789)		21,152
Investment differential		0		0
Intercompany transaction		(77,254)		0
Others (consolidated FS)		116,096		0
Sales of JointVentures		0		0
Profit (loss) for the period of JointVentures		(112,114)		(3,062)
Unrecognized equity interest		116,096		0
Accumulated unrecognized equity interest		₩ 116,096		₩ 0
Nawah Energy Company
Disclosure of joint ventures [Line Items]
Key operation activities	[9]	Operation of utility plant		Operation of utility plant
Location	[9]	UAE		UAE
Percentage of ownership	[9]	18.00%		18.00%
Effective percentage of ownership	[2]	18.00%		18.00%	[9]
Acquisition cost	[9]	₩ 296		₩ 296
Book value [Abstract]
Beginning balance		274		258
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		0		4
Other comprehensive income (loss)		11		12
Others (book value)		0		0
Ending balance		285		274
Share in net assets		285		274
Total assets		120,987		70,386
Total liabilities		119,405		68,864
Net assets		1,582		1,522
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		0		0
Profit (loss) for the period of JointVentures		₩ 3		₩ 0
MOMENTUM
Disclosure of joint ventures [Line Items]
Key operation activities		International thermonuclear experimental reactor construction management		International thermonuclear experimental reactor construction management
Location		FRANCE		FRANCE
Percentage of ownership		33.33%		33.33%
Effective percentage of ownership	[2]	33.33%		33.33%
Acquisition cost		₩ 1		₩ 1
Book value [Abstract]
Beginning balance		582		391
Acquisition		0		0
Disposal		0		0
Dividends received		(411)		0
Share of income (loss)		380		195
Other comprehensive income (loss)		2		(4)
Others (book value)		0		0
Ending balance		553		582
Share in net assets		553		582
Total assets		8,904		7,476
Total liabilities		7,245		5,730
Net assets		1,659		1,746
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		21,171		16,933
Profit (loss) for the period of JointVentures		₩ 1,099		₩ 520
Daegu Green Power
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		29.00%		29.00%
Effective percentage of ownership	[2]	54.24%		29.00%
Acquisition cost		₩ 46,225		₩ 46,225
Book value [Abstract]
Beginning balance		41,110		42,391
Acquisition		0	[10]	0
Disposal		0	[10]	0
Dividends received		0	[10]	0
Share of income (loss)		3,599	[10]	(1,283)
Other comprehensive income (loss)		0	[10]	0
Others (book value)		(21,885)	[10]	2
Ending balance		22,824	[10]	41,110
Share in net assets		43,124		19,514
Total assets		579,593		591,263
Total liabilities		500,092		523,972
Net assets		79,501		67,291
Investment differential		84		84
Intercompany transaction		0		0
Others (consolidated FS)		(20,384)		21,512
Sales of JointVentures		301,339		291,734
Profit (loss) for the period of JointVentures		₩ 4,899		₩ (4,424)
Shareholders' agreements that may cause future economic resource or cash outflows		The Group has a right to purchase all the shares of Daegu Green Power Co., Ltd. held by the financial investores at the yield-based transfer amount agreed with the shareholders.The Group can exercise its right 5, 10 and 13 years after the date of the investment. The Group has a right to purchase all or part of the shares of Daegu Green Power Co., Ltd. held by Lotte Engineering & Construction Co. at the yield-based transfer amount agreed with the shareholders
Significant restrictions on its abilities		Dividends can only be paid when all conditions of the loan agreement are satisfied or prior written consent of financial institutions is obtained. Shares cannot be wholly or partially transferred without prior written consent of financial institutions is obtained.		Principals on subordinated loans or dividends can only be paid when all conditions of the loan agreement are satisfied or prior written consent of financial institutions is obtained. Shares cannot be wholly or partially transferred without prior written consent of financial institutions is obtained.
Yeonggwang Wind Power Co., Ltd
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		46.00%		41.00%
Effective percentage of ownership	[2]	46.00%		41.00%
Acquisition cost		₩ 17,475		₩ 15,375
Book value [Abstract]
Beginning balance		15,304		15,294
Acquisition		2,100		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		223		10
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		17,627		15,304
Share in net assets		17,135		15,074
Total assets		262,610		255,777
Total liabilities		225,361		219,013
Net assets		37,249		36,764
Investment differential		492		230
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		24,256		0
Profit (loss) for the period of JointVentures		₩ (2,032)		₩ (145)
Shareholders' agreements that may cause future economic resource or cash outflows		In case the Group intends to purchase all or part of the shares from Daehan Green Energy Co., Ltd., which is a non-controlling shareholder, Daehan Green Energy Co., Ltd. has an obligation to evaluate the shares at fair value and transfer them to the Group.
Chester Solar IV SpA
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation	[1]
Location		CHILE		CHILE	[1]
Percentage of ownership		45.00%		81.82%	[1]
Effective percentage of ownership	[2]	45.00%		81.82%	[1]
Acquisition cost		₩ 1,700		₩ 1,700	[1]
Book value [Abstract]
Beginning balance		1,851		1,700
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(1,746)		301
Other comprehensive income (loss)		(55)		(150)
Others (book value)		622		0
Ending balance		672		1,851
Share in net assets		614		1,794
Total assets		13,443		15,307
Total liabilities		12,079		13,114
Net assets		1,364		2,193
Investment differential		58		57
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		1,590		1,415
Profit (loss) for the period of JointVentures		₩ (1,057)		₩ 609
Shareholders' agreements that may cause future economic resource or cash outflows		According to the shareholders' agreement, the Group has an obligation to purchase the shares at the agreed yield-based transfer price on the agreed date of exercise.According to the shareholders' agreement, when Sprott Chile SolarISpA intends to sell its shares
Significant restrictions on its abilities		Shares cannot be wholly or partially transferred without consent of the stakeholders is obtained.
Chester Solar V SpA
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation	[1]
Location		CHILE		CHILE	[1]
Percentage of ownership		45.00%		81.82%	[1]
Effective percentage of ownership	[2]	45.00%		81.82%	[1]
Acquisition cost		₩ 525		₩ 525	[1]
Book value [Abstract]
Beginning balance		474		525
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(619)		(21)
Other comprehensive income (loss)		(6)		(30)
Others (book value)		297		0
Ending balance		146		474
Share in net assets		23		356
Total assets		4,677		4,759
Total liabilities		4,625		4,324
Net assets		52		435
Investment differential		123		118
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		519		298
Profit (loss) for the period of JointVentures		₩ (402)		₩ (19)
Shareholders' agreements that may cause future economic resource or cash outflows		According to the shareholders' agreement, the Group has an obligation to purchase the shares at the agreed yield-based transfer price on the agreed date of exercise.According to the shareholders' agreement, when Sprott Chile SolarISpA intends to sell its shares.
Significant restrictions on its abilities		Shares cannot be wholly or partially transferred without consent of the stakeholders is obtained
Diego de Almagro Solar SpA
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation	[1]
Location		CHILE		CHILE	[1]
Percentage of ownership		45.00%		81.82%	[1]
Effective percentage of ownership	[2]	45.00%		81.82%	[1]
Acquisition cost		₩ 2,091		₩ 2,091	[1]
Book value [Abstract]
Beginning balance		1,663		2,091
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(1,014)		(299)
Other comprehensive income (loss)		(86)		(129)
Others (book value)		472		0
Ending balance		1,035		1,663
Share in net assets		937		1,569
Total assets		18,984		21,317
Total liabilities		16,901		19,399
Net assets		2,083		1,918
Investment differential		98		94
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		1,954		78
Profit (loss) for the period of JointVentures		₩ (1,104)		₩ (340)
Shareholders' agreements that may cause future economic resource or cash outflows		According to the shareholders' agreement, the Group has an obligation to purchase the shares at the agreed yield-based transfer price on the agreed date of exercise.According to the shareholders' agreement, when Sprott Chile SolarISpA intends to sell its shares.
Significant restrictions on its abilities		Shares cannot be wholly or partially transferred without consent of the stakeholders is obtained.
South Jamaica Power Company Limited
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		JAMAICA		JAMAICA
Percentage of ownership		20.00%		20.00%
Effective percentage of ownership	[2]	20.00%		20.00%
Acquisition cost		₩ 20,521		₩ 16,231
Book value [Abstract]
Beginning balance		16,124		6,704
Acquisition		4,290		9,141
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(7,131)		(184)
Other comprehensive income (loss)		580		463
Others (book value)		0		0
Ending balance		13,863		16,124
Share in net assets		13,863		16,124
Total assets		364,347		294,341
Total liabilities		295,029		213,723
Net assets		69,318		80,618
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		7,224		0
Profit (loss) for the period of JointVentures		₩ (35,650)		₩ (932)
Daesan Green Energy Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		35.00%		35.00%
Effective percentage of ownership	[2]	35.00%		35.00%
Acquisition cost		₩ 17,850		₩ 17,850
Book value [Abstract]
Beginning balance		17,433		0
Acquisition		0		17,850
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(251)		(417)
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		17,182		17,433
Share in net assets		17,182		17,433
Total assets		232,170		52,582
Total liabilities		183,079		2,774
Net assets		49,091		49,808
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		0		0
Profit (loss) for the period of JointVentures		₩ (717)		₩ (1,192)
RE Holiday Holdings LLC
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		USA		USA
Percentage of ownership		50.00%		50.00%
Effective percentage of ownership	[2]	50.00%		50.00%
Acquisition cost		₩ 42,948		₩ 42,948
Book value [Abstract]
Beginning balance		51,094		0
Acquisition		0		42,948
Disposal		0		0
Dividends received		0		(112)
Share of income (loss)		(6,525)		8,055
Other comprehensive income (loss)		(2,500)		203
Others (book value)		1		0
Ending balance		42,070		51,094
Share in net assets		42,070		51,094
Total assets		331,862		334,742
Total liabilities		247,722		232,553
Net assets		84,140		102,189
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		18,744		9,451
Profit (loss) for the period of JointVentures		₩ (345)		₩ 1,319
RE Pioneer Holdings LLC
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		USA		USA
Percentage of ownership		50.00%		50.00%
Effective percentage of ownership	[2]	50.00%		50.00%
Acquisition cost		₩ 27,891		₩ 27,891
Book value [Abstract]
Beginning balance		38,898		0
Acquisition		0		27,891
Disposal		0		0
Dividends received		(939)		(979)
Share of income (loss)		(5,507)		11,585
Other comprehensive income (loss)		(1,296)		401
Others (book value)		0		0
Ending balance		31,156		38,898
Share in net assets		31,156		38,898
Total assets		246,571		252,512
Total liabilities		184,258		174,717
Net assets		62,313		77,795
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		12,207		12,364
Profit (loss) for the period of JointVentures		₩ (1,912)		₩ 6,544
RE Barren Ridge 1 Holdings LLC
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		USA		USA
Percentage of ownership		50.00%		50.00%
Effective percentage of ownership	[2]	50.00%		50.00%
Acquisition cost		₩ 28,021		₩ 28,021
Book value [Abstract]
Beginning balance		41,415		0
Acquisition		0		28,021
Disposal		0		0
Dividends received		(1,152)		(1,114)
Share of income (loss)		4,609		13,994
Other comprehensive income (loss)		(1,957)		514
Others (book value)		1		0
Ending balance		42,916		41,415
Share in net assets		42,916		41,415
Total assets		209,850		221,304
Total liabilities		124,017		138,473
Net assets		85,833		82,831
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		10,384		10,567
Profit (loss) for the period of JointVentures		₩ 7,630		₩ 8,625
RE Astoria 2 LandCo LLC
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		USA		USA
Percentage of ownership		50.00%		50.00%
Effective percentage of ownership	[2]	50.00%		50.00%
Acquisition cost		₩ 5,188		₩ 5,188
Book value [Abstract]
Beginning balance		5,410		0
Acquisition		0		5,188
Disposal		0		0
Dividends received		(430)		(504)
Share of income (loss)		430		866
Other comprehensive income (loss)		192		(140)
Others (book value)		0		0
Ending balance		5,602		5,410
Share in net assets		5,602		5,410
Total assets		11,422		11,030
Total liabilities		217		210
Net assets		11,205		10,820
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		656		619
Profit (loss) for the period of JointVentures		₩ 651		₩ 583
RE Barren Ridge LandCo LLC
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		USA		USA
Percentage of ownership		50.00%		50.00%
Effective percentage of ownership	[2]	50.00%		50.00%
Acquisition cost		₩ 2,187		₩ 2,187
Book value [Abstract]
Beginning balance		1,898		0
Acquisition		0		2,187
Disposal		0		0
Dividends received		(194)		(202)
Share of income (loss)		172		(25)
Other comprehensive income (loss)		90		(62)
Others (book value)		0		0
Ending balance		1,966		1,898
Share in net assets		1,966		1,898
Total assets		4,019		3,881
Total liabilities		87		84
Net assets		3,932		3,797
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		262		248
Profit (loss) for the period of JointVentures		₩ 260		₩ 230
Laurel SpA
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation	[1]
Location		CHILE		CHILE	[1]
Percentage of ownership		45.00%		81.82%	[1]
Effective percentage of ownership	[2]	45.00%		81.82%	[1]
Acquisition cost		₩ 1,222		₩ 1,222	[1]
Book value [Abstract]
Beginning balance		921		0
Acquisition		0		1,222
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(665)		(309)
Other comprehensive income (loss)		(82)		8
Others (book value)		421		0
Ending balance		595		921
Share in net assets		406		739
Total assets		12,979		5,475
Total liabilities		12,076		4,572
Net assets		903		903
Investment differential		189		182
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		961		0
Profit (loss) for the period of JointVentures		₩ (1,130)		₩ (369)
Shareholders' agreements that may cause future economic resource or cash outflows		According to the shareholders' agreement, the Group has an obligation to purchase the shares at the agreed yield-based transfer price on the agreed date of exercise.According to the shareholders' agreement, when Sprott Chile SolarISpA intends to sell its shares
Significant restrictions on its abilities		Shares cannot be wholly or partially transferred without consent of the stakeholders is obtained.
KIAMCO KOWEPO Bannerton Hold Co Pty Ltd
Disclosure of joint ventures [Line Items]
Key operation activities	[7]	Power generation		Power generation
Location	[7]	AUSTRALIA		AUSTRALIA
Percentage of ownership	[7]	12.37%		12.37%
Effective percentage of ownership	[2]	12.37%		12.37%	[7]
Acquisition cost	[7]	₩ 4,095		₩ 4,095
Book value [Abstract]
Beginning balance		3,940		0
Acquisition		0		4,095
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(28)		(23)
Other comprehensive income (loss)		112		(132)
Others (book value)		0		0
Ending balance		4,024		3,940
Share in net assets		4,015		3,931
Total assets		32,883		31,958
Total liabilities		425		173
Net assets		32,458		31,785
Investment differential		9		9
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		0		0
Profit (loss) for the period of JointVentures		₩ (232)		₩ (222)
Chile Solar JV SpA
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		CHILE		CHILE
Percentage of ownership		50.00%		50.00%
Effective percentage of ownership	[2]	50.00%		50.00%
Acquisition cost		₩ 37,689		₩ 36,654
Book value [Abstract]
Beginning balance		36,865		0
Acquisition		0		36,654
Disposal		0		0
Dividends received		0		0
Share of income (loss)		842		4,453
Other comprehensive income (loss)		(2,849)		(5,278)
Others (book value)		1		1,036
Ending balance		34,859		36,865
Share in net assets		34,859		36,865
Total assets		69,903		73,740
Total liabilities		186		10
Net assets		69,717		73,730
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		591		73
Profit (loss) for the period of JointVentures		₩ 1,686		₩ 8,906
Taebaek Gadeoksan Wind Power Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		37.78%		46.58%
Effective percentage of ownership	[2]	37.78%		46.58%
Acquisition cost		₩ 8,500		₩ 8,500
Book value [Abstract]
Beginning balance		8,508		0
Acquisition		0		8,500
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(651)		8
Other comprehensive income (loss)		(9)		0
Others (book value)		(2)		0
Ending balance		7,846		8,508
Share in net assets		7,846		8,508
Total assets		70,270		18,766
Total liabilities		49,500		499
Net assets		20,770		18,267
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		0		0
Profit (loss) for the period of JointVentures		₩ (1,602)		₩ 18
Cheong-Song Noraesan Wind Power Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		29.01%		24.76%
Effective percentage of ownership	[2]	29.01%		24.76%
Acquisition cost		₩ 3,200		₩ 2,073
Book value [Abstract]
Beginning balance		2,073		0
Acquisition		1,127		2,073
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(153)		0
Other comprehensive income (loss)		(4)		0
Others (book value)		0		0
Ending balance		3,043		2,073
Share in net assets		2,982		2,029
Total assets		51,247		8,221
Total liabilities		40,969		24
Net assets		10,278		8,197
Investment differential		61		44
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		0		0
Profit (loss) for the period of JointVentures		₩ (549)		₩ 0
Chester Solar I SpA
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation	[1]
Location		CHILE		CHILE	[1]
Percentage of ownership		45.00%		81.82%	[1]
Effective percentage of ownership	[2]	45.00%		81.82%	[1]
Acquisition cost		₩ 1,181		₩ 1,181	[1]
Book value [Abstract]
Beginning balance		1,181		0
Acquisition		0		1,181
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(112)		0
Other comprehensive income (loss)		(79)		0
Others (book value)		167		0
Ending balance		1,157		1,181
Share in net assets		908		940
Total assets		7,859		1,712
Total liabilities		5,842		562
Net assets		2,017		1,150
Investment differential		249		241
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		0		0
Profit (loss) for the period of JointVentures		₩ (204)		₩ (81)
Shareholders' agreements that may cause future economic resource or cash outflows		According to the shareholders' agreement, the Group has an obligation to purchase the shares at the agreed yield-based transfer price on the agreed date of exercise.According to the shareholders' agreement, when Sprott Chile SolarISpA intends to sell its shares.
Solar Philippines Calatagan Corporation
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		PHILIPPINES		PHILIPPINES
Percentage of ownership		38.00%		38.00%
Effective percentage of ownership	[2]	38.00%		38.00%
Acquisition cost		₩ 47,903		₩ 47,903
Book value [Abstract]
Beginning balance		47,903		0
Acquisition		0		47,903
Disposal		0		0
Dividends received		(4,633)		0
Share of income (loss)		4,305		0
Other comprehensive income (loss)		1,355		0
Others (book value)		0		0
Ending balance		48,930		47,903
Share in net assets		19,236		26,764
Total assets		98,577		121,650
Total liabilities		47,956		51,219
Net assets		50,621		70,431
Investment differential		29,694		21,139
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		18,720		16,689
Profit (loss) for the period of JointVentures		₩ 11,331		₩ 8,732
Jeongam Wind Power Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation
Location		KOREA
Percentage of ownership		40.00%
Effective percentage of ownership	[2]	40.00%
Acquisition cost		₩ 5,580
Book value [Abstract]
Acquisition		0
Disposal		0
Dividends received		0
Share of income (loss)		0
Other comprehensive income (loss)		0
Others (book value)		4,437
Ending balance		4,437
Share in net assets		4,437
Total assets		94,134
Total liabilities		83,041
Net assets		11,093
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		0
Sales of JointVentures		11,644
Profit (loss) for the period of JointVentures		₩ 2,005
Korea Power Engineering Service Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Construction and service
Location		KOREA
Percentage of ownership		29.00%
Effective percentage of ownership	[2]	29.00%
Acquisition cost		₩ 290
Book value [Abstract]
Acquisition		0
Disposal		0
Dividends received		0
Share of income (loss)		0
Other comprehensive income (loss)		0
Others (book value)		4,902
Ending balance		4,902
Share in net assets		4,902
Total assets		19,052
Total liabilities		2,150
Net assets		16,902
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		0
Sales of JointVentures		12,284
Profit (loss) for the period of JointVentures		₩ 1,749
Saemangeum Solar Power Co., Ltd
Disclosure of joint ventures [Line Items]
Key operation activities	[11]	Power generation
Location	[11]	KOREA
Percentage of ownership	[11]	81.00%
Effective percentage of ownership	[2]	81.00%
Acquisition cost	[11]	₩ 10,000
Book value [Abstract]
Acquisition		10,000
Disposal		0
Dividends received		0
Share of income (loss)		(1,676)
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		8,324
Share in net assets		8,481
Total assets		13,740
Total liabilities		3,270
Net assets		10,470
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		(157)
Sales of JointVentures		0
Profit (loss) for the period of JointVentures		₩ (1,875)
Chungsongmeon BongSan wind power Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation
Location		KOREA
Percentage of ownership		29.00%
Effective percentage of ownership	[2]	29.00%
Acquisition cost		₩ 2,900
Book value [Abstract]
Acquisition		2,900
Disposal		0
Dividends received		0
Share of income (loss)		(136)
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		2,764
Share in net assets		982
Total assets		27,659
Total liabilities		24,272
Net assets		3,387
Investment differential		1,782
Intercompany transaction		0
Others (consolidated FS)		0
Sales of JointVentures		0
Profit (loss) for the period of JointVentures		₩ (1,365)
Jaeun Resident Wind Power Plant Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation
Location		KOREA
Percentage of ownership		29.00%
Effective percentage of ownership	[2]	29.00%
Acquisition cost		₩ 2,494
Book value [Abstract]
Acquisition		2,494
Disposal		0
Dividends received		0
Share of income (loss)		(296)
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		2,198
Share in net assets		2,198
Total assets		31,402
Total liabilities		23,823
Net assets		7,579
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		0
Sales of JointVentures		0
Profit (loss) for the period of JointVentures		₩ (844)
DE Energia SpA
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation
Location		CHILE
Percentage of ownership		49.00%
Effective percentage of ownership	[2]	49.00%
Acquisition cost		₩ 8,364
Book value [Abstract]
Acquisition		8,364
Disposal		0
Dividends received		0
Share of income (loss)		647
Other comprehensive income (loss)		(346)
Others (book value)		0
Ending balance		8,665
Share in net assets		6,854
Total assets		64,959
Total liabilities		50,971
Net assets		13,988
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		1,811
Sales of JointVentures		1,254
Profit (loss) for the period of JointVentures		₩ (2,645)
Dangjin Eco Power Co., Ltd. (newly)
Disclosure of joint ventures [Line Items]
Key operation activities	[12]	Power generation
Location	[12]	KOREA
Percentage of ownership	[12]	34.00%
Effective percentage of ownership	[2]	34.00%
Acquisition cost	[12]	₩ 25,661
Book value [Abstract]
Acquisition		9,180
Disposal		0
Dividends received		0
Share of income (loss)		0
Other comprehensive income (loss)		0
Others (book value)		16,481
Ending balance		25,661
Share in net assets		25,320
Total assets		99,907
Total liabilities		25,436
Net assets		74,471
Investment differential		341
Intercompany transaction		0
Others (consolidated FS)		0
Sales of JointVentures		107
Profit (loss) for the period of JointVentures		₩ (737)
Haemodum Solar Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation
Location		KOREA
Percentage of ownership		49.00%
Effective percentage of ownership	[2]	49.00%
Acquisition cost		₩ 2,940
Book value [Abstract]
Acquisition		2,940
Disposal		0
Dividends received		0
Share of income (loss)		0
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		2,940
Share in net assets		2,940
Total assets		7,237
Total liabilities		1,237
Net assets		6,000
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		0
Sales of JointVentures		0
Profit (loss) for the period of JointVentures		₩ 0
Yangyang Wind Power Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities	[13]	Power generation
Location	[13]	KOREA
Percentage of ownership	[13]	99.54%
Effective percentage of ownership	[2]	99.54%
Acquisition cost	[13]	₩ 10,800
Book value [Abstract]
Acquisition		10,800
Disposal		0
Dividends received		0
Share of income (loss)		0
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		10,800
Share in net assets		10,714
Total assets		10,764
Total liabilities		0
Net assets		10,764
Investment differential		86
Intercompany transaction		0
Others (consolidated FS)		0
Sales of JointVentures		0
Profit (loss) for the period of JointVentures		₩ (11)
HORUS SOLAR, S.A. DE C.V.
Disclosure of joint ventures [Line Items]
Key operation activities		Renewable power generation
Location		MEXICO
Percentage of ownership		14.95%
Effective percentage of ownership	[2]	14.95%
Acquisition cost		₩ 3,403
Book value [Abstract]
Acquisition		3,403
Disposal		0
Dividends received		0
Share of income (loss)		0
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		3,403
Share in net assets		308
Total assets		10,566
Total liabilities		8,503
Net assets		2,063
Investment differential		3,095
Intercompany transaction		0
Others (consolidated FS)		0
Sales of JointVentures		0
Profit (loss) for the period of JointVentures		₩ (7)
RECURSOS SOLARES PV DE MEXICO II, S.A. DE C.V.
Disclosure of joint ventures [Line Items]
Key operation activities		Renewable power generation
Location		MEXICO
Percentage of ownership		14.95%
Effective percentage of ownership	[2]	14.95%
Acquisition cost		₩ 672
Book value [Abstract]
Acquisition		672
Disposal		0
Dividends received		0
Share of income (loss)		0
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		672
Share in net assets		144
Total assets		3,848
Total liabilities		2,885
Net assets		963
Investment differential		528
Intercompany transaction		0
Others (consolidated FS)		0
Sales of JointVentures		0
Profit (loss) for the period of JointVentures		₩ 22
SUNMEX RENOVABLES, S.A. DE C.V.
Disclosure of joint ventures [Line Items]
Key operation activities	[14]	Renewable power generation
Location	[14]	MEXICO
Percentage of ownership	[14]	14.95%
Effective percentage of ownership	[2]	14.95%
Acquisition cost	[14]	₩ 222
Book value [Abstract]
Acquisition		222
Disposal		0
Dividends received		0
Share of income (loss)		0
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		222
Share in net assets		149
Total assets		3,170
Total liabilities		2,171
Net assets		999
Investment differential		73
Intercompany transaction		0
Others (consolidated FS)		0
Sales of JointVentures		0
Profit (loss) for the period of JointVentures		₩ 13
Stavro Holding II AB
Disclosure of joint ventures [Line Items]
Key operation activities		Holding company
Location		SWEDEN
Percentage of ownership		20.00%
Effective percentage of ownership	[2]	20.00%
Acquisition cost		₩ 5,524
Book value [Abstract]
Acquisition		5,524
Disposal		0
Dividends received		0
Share of income (loss)		(4)
Other comprehensive income (loss)		122
Others (book value)		(17)
Ending balance		5,625
Share in net assets		5,625
Total assets		28,141
Total liabilities		13
Net assets		28,128
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		0
Sales of JointVentures		0
Profit (loss) for the period of JointVentures		₩ (18)
[1]	The effective percentage of ownership is more than 50%. However, according to the shareholders' agreement, all critical financial and operating decisions must be agreed to by all ownership parties. For this reason, the entities are classified as joint ventures.
[2]	The percentage of ownership shown above is after considering the treasury stocks and others.
[3]	Datang Chaoyang Renewable Power Co., Ltd. was merged with Datang KEPCO Chaoyang Renewable Power Co., Ltd. during the year ended December 31, 2018.
[4]	The Company reclassified its shares of KODE NOVUS I LLC to financial assets at FVOCI during the year ended December 31, 2018 due to non-participation of capital increase that resulted in loss of significant influence.
[5]	The Company sold all of its shares of KODE NOVUS II LLC during the year ended December 31, 2018.
[6]	It was determined that there is objective evidence of impairment due to prolonged operating losses. As a result, the Company recognized an impairment loss of KRW248 million in impairment loss on investments in associates and joint ventures for the year ended December 31, 2019.
[7]	The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint a director to the board of directors of the entity.
[8]	It was determined that there is objective evidence of impairment due to prolonged operating losses. As a result, the Company recognized an impairment loss of KRW347 million in impairment loss on investments in associates and joint ventures for the year ended December 31, 2019.
[9]	The effective percentage of ownership is less than 20% but the Company has joint control over the entity as decisions on the major activities require the unanimous consent of the parties that collectively control the entity.
[10]	It was determined that there is objective evidence of impairment due to prolonged operating losses. As a result, the Company recognized an impairment loss of KRW21,827 million in impairment loss on investments in associates and joint ventures for the year ended December 31, 2019.
[11]	The effective percentage of ownership is more than 50%. However, according to the shareholders' agreement, all operation related decisions must be agreed by all ownership parties. For this reason, the entity is classified as a joint venture.
[12]	Eumseong Natural Gas Power Co., Ltd. and Dangjin Eco Solar Power Co., Ltd. were established by spin-off from Dangjin Eco Power Co., Ltd. After the spin-off, Eumseong Natural Gas Power Co., Ltd. was merged and absorbed by the Company during December 2019.
[13]	The temporary percentage of ownership is more than 50% due to differences in the timing of the payment. The Company is expected to exert significant influence after payment is completed in the first quarter of 2020.
[14]	The effective percentage of ownership is less than 20%. However, according to the shareholders' agreement, decisions on the major activities must be agreed to by all ownership parties. For this reason, the entities are classified as joint ventures.

Property, Plant and Equipment_2

Property, Plant and Equipment (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Changes in property and equipment [Line Items]
Beginning balance	₩ 152,743,194		₩ 150,882,414
Effect of change in accounting policy	4,947,947		0
Acquisitions	14,221,355		12,266,870
Disposals	(964,308)		(909,211)
Depreciation	(10,966,756)		(9,904,933)
Impairment	(50,036)	[1],[2]	(710,164)	[3]	₩ (51,067)
Others	4,770,431	[4],[5]	1,118,218
Ending balance	164,701,827		152,743,194		150,882,414
Land
Changes in property and equipment [Line Items]
Beginning balance	13,532,324		13,296,574
Effect of change in accounting policy	684,386
Acquisitions	8,717
Ending balance	13,826,246		13,532,324		13,296,574
Land | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	13,554,292		13,318,542
Effect of change in accounting policy	0		0
Acquisitions	40,752		2,254
Disposals	(29,205)		(18,240)
Depreciation	0		0
Impairment	(25,626)	[1],[2]	0	[3]
Others	307,850	[4],[5]	251,736
Ending balance	13,848,063		13,554,292		13,318,542
Land | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	13,554,292		13,318,542
Ending balance	13,848,063		13,554,292		13,318,542
Land | Government grants
Changes in property and equipment [Line Items]
Beginning balance	(21,968)		(21,968)
Effect of change in accounting policy	0		0
Acquisitions	0		0
Disposals	151		0
Depreciation	0		0
Impairment	0	[1],[2]	0	[3]
Others	0	[4],[5]	0
Ending balance	(21,817)		(21,968)		(21,968)
Buildings
Changes in property and equipment [Line Items]
Beginning balance	11,870,502		11,870,502
Effect of change in accounting policy	36,874
Acquisitions	18,106
Ending balance	12,383,786		11,870,502		11,870,502
Buildings | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	11,933,691		12,053,526
Effect of change in accounting policy	0		0
Acquisitions	3,195		10,156
Disposals	(23,409)		(8,545)
Depreciation	(821,680)		(767,845)
Impairment	(1,293)	[1],[2]	(1,896)	[3]
Others	1,355,202	[4],[5]	648,295
Ending balance	12,445,706		11,933,691		12,053,526
Buildings | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	19,431,536		18,777,678
Ending balance	20,756,351		19,431,536		18,777,678
Buildings | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(7,494,176)		(6,722,376)
Ending balance	(8,305,683)		(7,494,176)		(6,722,376)
Buildings | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance	(3,669)		(1,776)
Ending balance	(4,962)		(3,669)		(1,776)
Buildings | Government grants
Changes in property and equipment [Line Items]
Beginning balance	(63,189)		(63,539)
Effect of change in accounting policy	0		0
Acquisitions	(592)		(4,213)
Disposals	0		31
Depreciation	6,214		6,836
Impairment	0	[1],[2]	0	[3]
Others	(4,353)	[4],[5]	(2,304)
Ending balance	(61,920)		(63,189)		(63,539)
Structures
Changes in property and equipment [Line Items]
Beginning balance	42,520,941		43,908,364
Effect of change in accounting policy	20,840
Acquisitions	7,358
Ending balance	44,992,316		42,520,941		43,908,364
Structures | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	42,711,795		44,104,778
Effect of change in accounting policy	0		0
Acquisitions	1,663		11,123
Disposals	(470,230)		(587,278)
Depreciation	(2,399,283)		(2,476,278)
Impairment	(1,234)	[2]	(360)	[3]
Others	5,336,159	[4],[5]	1,659,810
Ending balance	45,178,870		42,711,795		44,104,778
Structures | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	66,335,506		66,184,484
Ending balance	70,900,343		66,335,506		66,184,484
Structures | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(23,615,312)		(22,071,667)
Ending balance	(25,711,840)		(23,615,312)		(22,071,667)
Structures | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance	(8,339)		(8,039)
Ending balance	(9,633)		(8,339)		(8,039)
Structures | Government grants
Changes in property and equipment [Line Items]
Beginning balance	(190,854)		(196,414)
Effect of change in accounting policy	0		0
Acquisitions	0		0
Disposals	2,405		3,270
Depreciation	9,373		10,292
Impairment	0	[2]	0	[3]
Others	(7,478)	[4],[5]	(8,002)
Ending balance	(186,554)		(190,854)		(196,414)
Machinery
Changes in property and equipment [Line Items]
Beginning balance	47,283,353		46,692,610
Effect of change in accounting policy	0
Acquisitions	1,308
Ending balance	49,748,393		47,283,353		46,692,610
Machinery | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	47,456,595	[6]	46,875,798
Effect of change in accounting policy	0		0	[6]
Acquisitions	326,606		460,676	[6]
Disposals	(248,951)		(250,159)	[6]
Depreciation	(5,452,669)		(4,973,252)	[6]
Impairment	(12,247)	[2]	(393,839)	[3],[6]
Others	7,837,966	[4],[5]	5,737,371	[6]
Ending balance	49,907,300		47,456,595	[6]	46,875,798
Machinery | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	82,047,823		75,826,292
Ending balance	89,224,339		82,047,823		75,826,292
Machinery | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(34,151,878)		(28,904,982)
Ending balance	(38,865,392)		(34,151,878)		(28,904,982)
Machinery | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance	(439,350)		(45,512)
Ending balance	(451,647)		(439,350)		(45,512)
Machinery | Government grants
Changes in property and equipment [Line Items]
Beginning balance	(173,242)		(183,188)
Effect of change in accounting policy	0		0
Acquisitions	(1,050)		(1,185)
Disposals	635		823
Depreciation	17,993		18,099
Impairment	0	[2]	0	[3]
Others	(3,243)	[4],[5]	(7,791)
Ending balance	(158,907)		(173,242)		(183,188)
Ships
Changes in property and equipment [Line Items]
Beginning balance	302		403
Effect of change in accounting policy	3,986,947
Acquisitions	126,807
Ending balance	201		302		403
Ships | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	302		403
Effect of change in accounting policy	0		0
Acquisitions	0		0
Disposals	0		0
Depreciation	(100)		(103)
Impairment	0	[2]	0	[3]
Others	(1)	[5]	2
Ending balance	201		302		403
Ships | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	3,655		4,175
Ending balance	3,104		3,655		4,175
Ships | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(3,353)		(3,772)
Ending balance	(2,903)		(3,353)		(3,772)
Vehicles
Changes in property and equipment [Line Items]
Beginning balance	67,969		74,716
Effect of change in accounting policy	11,258
Acquisitions	9,559
Ending balance	68,310		67,969		74,716
Vehicles | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	72,189		81,038
Effect of change in accounting policy	0		0
Acquisitions	3,789		2,774
Disposals	4,558		(402)
Depreciation	(33,650)		(32,620)
Impairment	0	[1],[2]	0	[3]
Others	23,699	[5]	21,399
Ending balance	70,585		72,189		81,038
Vehicles | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	287,954		276,425
Ending balance	309,829		287,954		276,425
Vehicles | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(215,649)		(195,260)
Ending balance	(239,128)		(215,649)		(195,260)
Vehicles | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance	(116)		(127)
Ending balance	(116)		(116)		(127)
Vehicles | Government grants
Changes in property and equipment [Line Items]
Beginning balance	(4,220)		(6,322)
Effect of change in accounting policy	0		0
Acquisitions	(228)		(45)
Disposals	5		0
Depreciation	2,170		2,146
Impairment	0	[1],[2]	0	[3]
Others	(2)	[5]	1
Ending balance	(2,275)		(4,220)		(6,322)
Equipment
Changes in property and equipment [Line Items]
Beginning balance	382,441		419,911
Ending balance	373,874		382,441		419,911
Equipment | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	382,859		420,672
Effect of change in accounting policy	0		0
Acquisitions	47,532		36,884
Disposals	(162)		(265)
Depreciation	(199,376)		(187,821)
Impairment	(227)	[1],[2]	(36)	[3]
Others	143,489	[4],[5]	113,425
Ending balance	374,115		382,859		420,672
Equipment | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	1,558,309		1,440,870
Ending balance	1,716,210		1,558,309		1,440,870
Equipment | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(1,175,408)		(1,020,192)
Ending balance	(1,342,053)		(1,175,408)		(1,020,192)
Equipment | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance	(42)		(6)
Ending balance	(42)		(42)		(6)
Equipment | Government grants
Changes in property and equipment [Line Items]
Beginning balance	(418)		(761)
Effect of change in accounting policy	0		0
Acquisitions	(81)		(22)
Disposals	0		0
Depreciation	262		365
Impairment	0	[1],[2]	0	[3]
Others	(4)	[4],[5]	0
Ending balance	(241)		(418)		(761)
Tools
Changes in property and equipment [Line Items]
Beginning balance	192,000		199,636
Ending balance	163,661		192,000		199,636
Tools | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	192,675		200,663
Effect of change in accounting policy	0		0
Acquisitions	20,956		12,331
Disposals	(31)		(268)
Depreciation	(87,708)		(83,283)
Impairment	0	[1],[2]	(6)	[3]
Others	38,172	[4],[5]	63,238
Ending balance	164,064		192,675		200,663
Tools | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	1,073,145		1,010,537
Ending balance	1,098,127		1,073,145		1,010,537
Tools | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(880,432)		(809,842)
Ending balance	(934,023)		(880,432)		(809,842)
Tools | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance	(38)		(32)
Ending balance	(40)		(38)		(32)
Tools | Government grants
Changes in property and equipment [Line Items]
Beginning balance	(675)		(1,027)
Effect of change in accounting policy	0		0
Acquisitions	0		(44)
Disposals	0		0
Depreciation	281		432
Impairment	0	[1],[2]	0	[3]
Others	(9)	[4],[5]	(36)
Ending balance	(403)		(675)		(1,027)
Construction in progress
Changes in property and equipment [Line Items]
Beginning balance	28,766,427		25,523,457
Ending balance	28,358,259		28,766,427		25,523,457
Construction in progress | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	28,821,167		25,572,541
Effect of change in accounting policy	0		0
Acquisitions	13,544,091		11,749,397
Disposals	(199,853)		(47,463)
Depreciation	0		0
Impairment	(8,828)	[1],[2]	(167,603)	[3]
Others	(13,737,107)	[4],[5]	(8,285,705)
Ending balance	28,419,470		28,821,167		25,572,541
Construction in progress | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	29,026,880		25,610,649
Ending balance	28,584,806		29,026,880		25,610,649
Construction in progress | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance	(205,713)		(38,108)
Ending balance	(165,336)		(205,713)		(38,108)
Construction in progress | Government grants
Changes in property and equipment [Line Items]
Beginning balance	(54,740)		(49,084)
Effect of change in accounting policy	0		0
Acquisitions	12,338		(23,895)
Disposals	0		0
Depreciation	0		0
Impairment	0	[1],[2]	0	[3]
Others	(18,809)	[4],[5]	18,239
Ending balance	(61,211)		(54,740)		(49,084)
Finance lease assets
Changes in property and equipment [Line Items]
Beginning balance	195,704		297,652
Ending balance	0		195,704		297,652
Finance lease assets | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	195,730		297,679
Effect of change in accounting policy	(195,730)		0
Acquisitions	0		0
Disposals	0		0
Depreciation	0		(101,888)
Impairment	0	[1],[2]	0	[3]
Others	0	[4],[5]	(61)
Ending balance	0		195,730		297,679
Finance lease assets | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	2,390,701		2,390,680
Ending balance	0		2,390,701		2,390,680
Finance lease assets | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(2,194,971)		(2,093,001)
Ending balance	0		(2,194,971)		(2,093,001)
Finance lease assets | Government grants
Changes in property and equipment [Line Items]
Beginning balance	(26)		(27)
Effect of change in accounting policy	26		0
Acquisitions	0		0
Disposals	0		0
Depreciation	0		1
Impairment	0	[1],[2]	0	[3]
Others	0	[4],[5]	0
Ending balance	0		(26)		(27)
Right-of-use assets
Changes in property and equipment [Line Items]
Beginning balance	0		0
Ending balance	4,783,573		0		0
Right-of-use assets | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	0		0
Effect of change in accounting policy	5,143,651		0
Acquisitions	220,996		0
Disposals	0		0
Depreciation	(581,074)		0
Impairment	0	[1],[2]	0	[3]
Others	0	[4],[5]	0
Ending balance	4,783,573		0		0
Right-of-use assets | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	0		0
Ending balance	7,574,010		0		0
Right-of-use assets | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	0		0
Ending balance	(2,790,437)		0		0
Right-of-use assets | Government grants
Changes in property and equipment [Line Items]
Beginning balance	0		0
Ending balance	0		0		0
Retirements, property, plant and equipment
Changes in property and equipment [Line Items]
Beginning balance	5,571,754		6,039,484
Ending balance	7,374,527		5,571,754		6,039,484
Retirements, property, plant and equipment | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	5,571,754		6,039,484
Effect of change in accounting policy	0		0
Acquisitions	0		1,988
Disposals	0		0
Depreciation	(626,856)		(610,435)
Impairment	0	[1],[2]	(146,424)	[3]
Others	2,429,629	[4],[5]	287,141
Ending balance	7,374,527		5,571,754		6,039,484
Retirements, property, plant and equipment | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	9,424,181		9,395,821
Ending balance	11,690,188		9,424,181		9,395,821
Retirements, property, plant and equipment | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(3,706,004)		(3,356,337)
Ending balance	(4,169,238)		(3,706,004)		(3,356,337)
Retirements, property, plant and equipment | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance	(146,423)		0
Ending balance	(146,423)		(146,423)		0
Other property, plant and equipment
Changes in property and equipment [Line Items]
Beginning balance			2,439,620
Ending balance	2,628,681				2,439,620
Other property, plant and equipment | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	2,359,477		2,439,620
Effect of change in accounting policy	0		0
Acquisitions	1,388		8,691
Disposals	(221)		(715)
Depreciation	(800,653)		(709,579)
Impairment	(581)	[1],[2]	0	[3]
Others	1,069,271	[4],[5]	621,460
Ending balance	2,628,681		2,359,477		2,439,620
Other property, plant and equipment | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	11,875,394		11,247,021
Ending balance	12,955,782		11,875,394		11,247,021
Other property, plant and equipment | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(9,515,917)		(8,807,401)
Ending balance	₩ (10,327,101)		₩ (9,515,917)		₩ (8,807,401)
[1]	As described in Note 2, the Company recognized impairment loss of KRW3,819 million related to Wolsong unit 1, Shin-Hanul unit 3 and 4 and reversal of impairment loss of KRW16,693 million related to Wolsong unit 1.
[2]	KEPCO Bylong Australia Pty., Ltd., 100% owned subsidiary, performed an impairment test over its land and others. The Company recognized the amount of the carrying amount in excess of its recoverable amount as an impairment loss.
[3]	Korea Hydro & Nuclear Power Co., Ltd. And Korea Western Power Co., Ltd., 100% owned subsidiaries, have determined that there are impairment indicators for the shutdowns of certain power generation units and fire, and performed an impairment test over the individual assets. As a result, the Company recognized the amount of the carrying amount in excess of its recoverable amount as an impairment loss in the consolidated statements of comprehensive income.
[4]	'Others' include immaterial amounts which have been reclassed from Construction-in-progress to other assets in the current period to reflect assets that had finished construction in the prior periods.
[5]	'Others' include the amounts of assets acquired by the business combination. (see Note 51)
[6]	As described in Note 26, the amount of acquisition of machinery includes KRW204,787 million of that the Company believes the possibility of economic benefit outflow is probable on the request for additional construction costs of Hyundai E&C, GS Engineering & Construction Corp. and Hansol SeenTec Co., Ltd.

Investment properties, net (Det

Investment properties, net (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019		Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about investment property [Line Items]
Beginning balance	₩ 159,559		₩ 284,714	₩ 353,680
Depreciation	(5,069)		(923)	(1,176)
Others	4,090	[1]	(124,232)	(67,790)
Endings balance	158,580		159,559	284,714
Carrying Amount Other than Government Grants
Disclosure of detailed information about investment property [Line Items]
Beginning balance	159,609		284,797
Depreciation	(5,070)		(924)
Others	4,054	[1]	(124,264)
Endings balance	158,593		159,609	284,797
Acquisition cost
Disclosure of detailed information about investment property [Line Items]
Beginning balance	174,741		300,370
Endings balance	194,487		174,741	300,370
Accumulated depreciation
Disclosure of detailed information about investment property [Line Items]
Beginning balance	(15,132)		(15,573)
Endings balance	(35,894)		(15,132)	(15,573)
Government grants
Disclosure of detailed information about investment property [Line Items]
Beginning balance	(50)		(83)
Depreciation	1		1
Others	36	[1]	32
Endings balance	(13)		(50)	(83)
Investment property - Land
Disclosure of detailed information about investment property [Line Items]
Beginning balance	139,940		264,205
Depreciation			0
Others	(10,043)	[1]	(124,265)
Endings balance	129,897		139,940	264,205
Investment property - Land | Carrying Amount Other than Government Grants
Disclosure of detailed information about investment property [Line Items]
Beginning balance	139,940		264,205
Others	(10,043)	[1]	(124,265)
Endings balance	129,897		139,940	264,205
Investment property - Land | Acquisition cost
Disclosure of detailed information about investment property [Line Items]
Beginning balance	139,940		264,205
Endings balance	129,897		139,940	264,205
Investment property - Buildings
Disclosure of detailed information about investment property [Line Items]
Beginning balance	19,619		20,509
Depreciation	(5,069)		(923)
Others	14,133	[1]	33
Endings balance	28,683		19,619	20,509
Investment property - Buildings | Carrying Amount Other than Government Grants
Disclosure of detailed information about investment property [Line Items]
Beginning balance	19,669		20,592
Depreciation	(5,070)		(924)
Others	14,097	[1]	1
Endings balance	28,696		19,669	20,592
Investment property - Buildings | Acquisition cost
Disclosure of detailed information about investment property [Line Items]
Beginning balance	34,801		36,165
Endings balance	64,590		34,801	36,165
Investment property - Buildings | Accumulated depreciation
Disclosure of detailed information about investment property [Line Items]
Beginning balance	(15,132)		(15,573)
Endings balance	(35,894)		(15,132)	(15,573)
Investment property - Buildings | Government grants
Disclosure of detailed information about investment property [Line Items]
Beginning balance	(50)		(83)
Depreciation	1		1
Others	36	[1]	32
Endings balance	₩ (13)		₩ (50)	₩ (83)
[1]	As described in Note 42, the Company reclassified land and buildings amounting to KRW2,765 million and KRW19,369 million, respectively, from assets held-for-sale to investment properties during the year ended December 31, 2019.

Income and expenses on investme

Income and expenses on investment property (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income and expenses on investment property [Abstract]
Rental income	₩ 9,782	₩ 9,494
Operating and maintenance expenses related to rental income	(1,257)	(923)
Operating and maintenance expenses not related to rental income	(3,812)	0
Rental income from investment property, net of direct operating expense	₩ 4,713	₩ 8,571

The fair value of investment pr

The fair value of investment property (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure - The fair value of investment property [Line Items]
Fair value of Investment property	₩ 240,088	₩ 190,454
Carrying amount of Investment property	158,580	159,559	₩ 284,714
Land
Disclosure - The fair value of investment property [Line Items]
Fair value of Investment property	202,042	167,178
Buildings
Disclosure - The fair value of investment property [Line Items]
Fair value of Investment property	₩ 38,046	₩ 23,276

Construction Contracts (Details

Construction Contracts (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Construction Services Contracts [Abstract]
Beginning balance	₩ 3,620,788		₩ 4,176,595		₩ 7,236,888
Increase and decrease
new orders and foreign exchange impact	(390,224)		(1,207,097)		(438,142)
Changes in scope of construction work	10,955		20,513		286,251
Increase (decrease) in Construction contracts from new orders and foreign exchange	379,269	[1]	1,186,584	[2]	151,891	[3]
Recognized as revenue	(1,264,916)		(1,742,391)		(3,212,184)
Ending balance	₩ 2,735,141		₩ 3,620,788		₩ 4,176,595
[1]	For the year ended December 31, 2019, the increased balance of contracts from new orders and foreign exchange impact is W 390,224 million and the decreased balance of contracts due to changes in scope of construction work is W 10,955 million.
[2]	For the year ended December 31, 2018, the increased balance of contracts from new orders and foreign exchange impact is W1,207,097 million and the decreased balance of contracts due to changes in scope of construction work is W20,513 million.
[3]	For the year ended December 31, 2017, the increased balance of contracts from new orders and other is W438,142 million and the decreased balance of contracts due to changes in scope of construction work is KRW286,251 million.

Construction Services Contrac_3

Construction Services Contracts, Continued (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2019	Dec. 31, 2018
Accumulated earned revenue, expense and others
Accumulated earned revenue		₩ 20,971,487	₩ 19,801,220
Accumulated expense		19,566,647	18,651,188
Accumulated profit		1,404,840	1,150,032
Unearned advance receipts		0	0
Contract with Customer, Asset and Liability
Assets	[1]	53,827	36,232
Liabilities	[2]	₩ 73,420	₩ 350,460
[1]	Included in trade and other receivables, net, in the consolidated statements of financial position. The balance of receivables from construction contracts are KRW35,218 million and KRW46,489 million, as of December 31, 2018 and 2019, respectively.
[2]	Included in non-financial liabilities in the consolidated statements of financial position.

Detailed information about inta

Detailed information about intangible assets (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Changes in intangible assets other than goodwill
Impairment loss	₩ 513,609		₩ 8,112		₩ 20
Intangible assets other than goodwill
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	1,225,942		1,187,121		1,187,121
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	1,225,942		1,187,121
Changes in intangible assets other than goodwill
Acquisition	229,426		110,587
Disposal	(8,321)		(9)
Amortization	(156,915)		(118,938)
Impairment loss	(513,609)	[1]	(8,140)	[2]
Others	293,453	[3]	55,321
Ending balance	1,069,976		1,225,942		1,187,121
Intangible assets other than goodwill | Carrying Amount Other than Government Grants
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	1,239,036		1,201,860		1,201,860
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	1,239,036		1,201,860
Changes in intangible assets other than goodwill
Acquisition	229,426		110,587
Disposal	(8,321)		(9)
Amortization	(157,952)		(120,794)
Impairment loss	(513,609)	[1]	(8,939)	[2]
Others	294,231	[3]	56,331
Ending balance	1,082,811		1,239,036		1,201,860
Intangible assets other than goodwill | Acquisition cost
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	3,069,716		2,897,446		2,897,446
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	3,069,716		2,897,446
Changes in intangible assets other than goodwill
Ending balance	3,597,314		3,069,716		2,897,446
Intangible assets other than goodwill | Accumulated amortization
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	(1,805,784)		(1,679,576)		(1,679,576)
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(1,805,784)		(1,679,576)
Changes in intangible assets other than goodwill
Ending balance	(1,967,732)		(1,805,784)		(1,679,576)
Intangible assets other than goodwill | Accumulated impairment [Member]
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	(24,896)		(16,010)		(16,010)
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(24,896)		(16,010)
Changes in intangible assets other than goodwill
Ending balance	(546,771)		(24,896)		(16,010)
Intangible assets other than goodwill | Government grants
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	(13,094)		(14,739)		(14,739)
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(13,094)		(14,739)
Changes in intangible assets other than goodwill
Acquisition	0		0
Disposal	0		0
Amortization	1,037		1,856
Impairment loss	0	[1]	799	[2]
Others	(778)	[3]	(1,010)
Ending balance	(12,835)		(13,094)		(14,739)
Software
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	157,261		125,405		125,405
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	157,261		125,405
Changes in intangible assets other than goodwill
Acquisition	42,694		10,861
Disposal	(774)		(1)
Amortization	(81,681)		(53,501)
Impairment loss	0	[1]	0	[2]
Others	47,260	[3]	74,497
Ending balance	164,760		157,261		125,405
Software | Carrying Amount Other than Government Grants
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	157,681		125,891		125,891
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	157,681		125,891
Changes in intangible assets other than goodwill
Acquisition	42,694		10,861
Disposal	(774)		(1)
Amortization	(81,883)		(53,755)
Impairment loss	0	[1]	0	[2]
Others	47,277	[3]	74,685
Ending balance	164,995		157,681		125,891
Software | Acquisition cost
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	619,662		534,191		534,191
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	619,662		534,191
Changes in intangible assets other than goodwill
Ending balance	707,731		619,662		534,191
Software | Accumulated amortization
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	(461,981)		(408,300)		(408,300)
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(461,981)		(408,300)
Changes in intangible assets other than goodwill
Ending balance	(542,736)		(461,981)		(408,300)
Software | Government grants
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	(420)		(486)		(486)
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(420)		(486)
Changes in intangible assets other than goodwill
Acquisition	0		0
Disposal	0		0
Amortization	202		254
Impairment loss	0	[1]	0	[2]
Others	(17)	[3]	(188)
Ending balance	(235)		(420)		(486)
Licences and franchises
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	0		0		0
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	0		0
Changes in intangible assets other than goodwill
Ending balance	0		0		0
Licences and franchises | Acquisition cost
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	3,398		3,398		3,398
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	3,398		3,398
Changes in intangible assets other than goodwill
Ending balance	3,398		3,398		3,398
Licences and franchises | Accumulated amortization
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	(3,398)		(3,398)		(3,398)
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(3,398)		(3,398)
Changes in intangible assets other than goodwill
Ending balance	(3,398)		(3,398)		(3,398)
Copyrights, patents rights and other industrial rights
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	67,112		23,981		23,981
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	67,112		23,981
Changes in intangible assets other than goodwill
Acquisition	171		28
Disposal	(325)		0
Amortization	(9,196)		(8,665)
Impairment loss	0	[1]	(13)	[2]
Others	(4,501)	[3]	51,781
Ending balance	53,261		67,112		23,981
Copyrights, patents rights and other industrial rights | Carrying Amount Other than Government Grants
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	67,112		23,981		23,981
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	67,112		23,981
Changes in intangible assets other than goodwill
Acquisition	171		28
Disposal	(325)		0
Amortization	(9,196)		(8,665)
Impairment loss	0	[1]	(13)	[2]
Others	(4,501)	[3]	51,781
Ending balance	53,261		67,112		23,981
Copyrights, patents rights and other industrial rights | Acquisition cost
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	97,033		43,857		43,857
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	97,033		43,857
Changes in intangible assets other than goodwill
Ending balance	102,828		97,033		43,857
Copyrights, patents rights and other industrial rights | Accumulated amortization
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	(29,921)		(19,876)		(19,876)
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(29,921)		(19,876)
Changes in intangible assets other than goodwill
Ending balance	(40,389)		(29,921)		(19,876)
Copyrights, patents rights and other industrial rights | Accumulated impairment [Member]
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	0		0		0
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	0		0
Changes in intangible assets other than goodwill
Ending balance	(9,178)		0		0
Mining rights
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	534,524		539,633		539,633
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	534,524		539,633
Changes in intangible assets other than goodwill
Acquisition	8,742		29,687
Disposal	0		0
Amortization	(7,186)		(3,186)
Impairment loss	(513,519)	[1]	0	[2]
Others	21,162	[3]	(31,610)
Ending balance	43,723		534,524		539,633
Mining rights | Carrying Amount Other than Government Grants
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	534,524		539,633		539,633
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	534,524		539,633
Changes in intangible assets other than goodwill
Acquisition	8,742		29,687
Disposal	0		0
Amortization	(7,186)		(3,186)
Impairment loss	(513,519)	[1]	0	[2]
Others	21,162	[3]	(31,610)
Ending balance	43,723		534,524		539,633
Mining rights | Acquisition cost
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	561,945		553,876		553,876
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	561,945		553,876
Changes in intangible assets other than goodwill
Ending balance	584,969		561,945		553,876
Mining rights | Accumulated amortization
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	(27,421)		(14,243)		(14,243)
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(27,421)		(14,243)
Changes in intangible assets other than goodwill
Ending balance	(28,456)		(27,421)		(14,243)
Mining rights | Accumulated impairment [Member]
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	0		0		0
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	0		0
Changes in intangible assets other than goodwill
Ending balance	(512,790)		0		0
Development expenditures
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	90,376		80,816		80,816
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	90,376		80,816
Changes in intangible assets other than goodwill
Acquisition	687		823
Disposal	0		0
Amortization	(28,068)		(25,509)
Impairment loss	(68)	[1]	0	[2]
Others	29,424	[3]	34,246
Ending balance	92,351		90,376		80,816
Development expenditures | Carrying Amount Other than Government Grants
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	92,486		84,518		84,518
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	92,486		84,518
Changes in intangible assets other than goodwill
Acquisition	687		823
Disposal	0		0
Amortization	(28,901)		(27,100)
Impairment loss	(68)	[1]	0	[2]
Others	29,639	[3]	34,245
Ending balance	93,843		92,486		84,518
Development expenditures | Acquisition cost
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	878,462		836,996		836,996
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	878,462		836,996
Changes in intangible assets other than goodwill
Ending balance	916,834		878,462		836,996
Development expenditures | Accumulated amortization
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	(785,976)		(752,478)		(752,478)
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(785,976)		(752,478)
Changes in intangible assets other than goodwill
Ending balance	(822,972)		(785,976)		(752,478)
Development expenditures | Accumulated impairment [Member]
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	0		0		0
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	0		0
Changes in intangible assets other than goodwill
Ending balance	(19)		0		0
Development expenditures | Government grants
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	(2,110)		(3,702)		(3,702)
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(2,110)		(3,702)
Changes in intangible assets other than goodwill
Acquisition	0		0
Disposal	0		0
Amortization	833		1,591
Impairment loss	0	[1]	0	[2]
Others	(215)	[3]	1
Ending balance	(1,492)		(2,110)		(3,702)
Intangible assets under development
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	59,972		129,370		129,370
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	59,972		129,370
Changes in intangible assets other than goodwill
Acquisition	56,082		67,383
Disposal	0		0
Amortization	0		0
Impairment loss	0	[1]	(8,113)	[2]
Others	(66,593)	[3]	(128,668)
Ending balance	49,461		59,972		129,370
Intangible assets under development | Carrying Amount Other than Government Grants
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	70,536		139,910		139,910
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	70,536		139,910
Changes in intangible assets other than goodwill
Acquisition	56,082		67,383
Disposal	0		0
Amortization	0		0
Impairment loss	0	[1]	(8,912)	[2]
Others	(66,128)	[3]	(127,845)
Ending balance	60,490		70,536		139,910
Intangible assets under development | Acquisition cost
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	83,381		143,851		143,851
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	83,381		143,851
Changes in intangible assets other than goodwill
Ending balance	73,335		83,381		143,851
Intangible assets under development | Accumulated impairment [Member]
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	(12,845)		(3,941)		(3,941)
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(12,845)		(3,941)
Changes in intangible assets other than goodwill
Ending balance	(12,845)		(12,845)		(3,941)
Intangible assets under development | Government grants
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	(10,564)		(10,540)		(10,540)
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(10,564)		(10,540)
Changes in intangible assets other than goodwill
Acquisition	0		0
Disposal	0		0
Amortization	0		0
Impairment loss	0	[1]	799	[2]
Others	(465)	[3]	(823)
Ending balance	(11,029)		(10,564)		(10,540)
Usage rights of donated assets and other
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	87,011		101,647		101,647
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	87,011		101,647
Changes in intangible assets other than goodwill
Acquisition	0		0
Disposal	0		0
Amortization	(15,632)		(13,296)
Impairment loss	0	[1]	0	[2]
Others	121,782	[3]	(1,340)
Ending balance	193,161		87,011		101,647
Usage rights of donated assets and other | Carrying Amount Other than Government Grants
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	87,011		101,658		101,658
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	87,011		101,658
Changes in intangible assets other than goodwill
Acquisition	0		0
Disposal	0		0
Amortization	(15,632)		(13,307)
Impairment loss	0	[1]	0	[2]
Others	121,782	[3]	(1,340)
Ending balance	193,161		87,011		101,658
Usage rights of donated assets and other | Acquisition cost
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	459,682		459,682		459,682
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	459,682		459,682
Changes in intangible assets other than goodwill
Ending balance	582,825		459,682		459,682
Usage rights of donated assets and other | Accumulated amortization
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	(372,671)		(358,024)		(358,024)
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(372,671)		(358,024)
Changes in intangible assets other than goodwill
Ending balance	(389,664)		(372,671)		(358,024)
Usage rights of donated assets and other | Government grants
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	0		(11)		(11)
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	0		(11)
Changes in intangible assets other than goodwill
Acquisition	0		0
Disposal	0		0
Amortization	0		11
Impairment loss	0	[1]	0	[2]
Others	0	[3]	0
Ending balance	0		0		(11)
Leasehold rights
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	5,552		5,044		5,044
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	5,552		5,044
Changes in intangible assets other than goodwill
Acquisition	0		0
Disposal	0		0
Amortization	(741)		(667)
Impairment loss	0	[1]	0	[2]
Others	507	[3]	1,175
Ending balance	5,318		5,552		5,044
Leasehold rights | Carrying Amount Other than Government Grants
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	5,552		5,044		5,044
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	5,552		5,044
Changes in intangible assets other than goodwill
Acquisition	0		0
Disposal	0		0
Amortization	(741)		(667)
Impairment loss	0	[1]	0	[2]
Others	507	[3]	1,175
Ending balance	5,318		5,552		5,044
Leasehold rights | Acquisition cost
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	25,482		24,306		24,306
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	25,482		24,306
Changes in intangible assets other than goodwill
Ending balance	25,989		25,482		24,306
Leasehold rights | Accumulated amortization
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	(19,930)		(19,262)		(19,262)
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(19,930)		(19,262)
Changes in intangible assets other than goodwill
Ending balance	(20,671)		(19,930)		(19,262)
Greenhouse gas emissions rights
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	7,050		0		0
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	7,050		0
Changes in intangible assets other than goodwill
Acquisition	118,743		0
Disposal	(7,058)		0
Amortization	0		0
Impairment loss	0	[1]	0	[2]
Others	(77,079)	[3]	7,050
Ending balance	41,656		7,050		0
Greenhouse gas emissions rights | Carrying Amount Other than Government Grants
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	7,050		0		0
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	7,050		0
Changes in intangible assets other than goodwill
Acquisition	118,743		0
Disposal	(7,058)		0
Amortization	0		0
Impairment loss	0	[1]	0	[2]
Others	(77,079)	[3]	7,050
Ending balance	41,656		7,050		0
Greenhouse gas emissions rights | Acquisition cost
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	7,050		0		0
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	7,050		0
Changes in intangible assets other than goodwill
Ending balance	41,656		7,050		0
Others
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	217,084		181,225		181,225
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	217,084		181,225
Changes in intangible assets other than goodwill
Acquisition	2,307		1,805
Disposal	(164)		(8)
Amortization	(14,411)		(14,114)
Impairment loss	(22)	[1]	(14)	[2]
Others	221,491	[3]	48,190
Ending balance	426,285		217,084		181,225
Others | Carrying Amount Other than Government Grants
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	217,084		181,225		181,225
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	217,084		181,225
Changes in intangible assets other than goodwill
Acquisition	2,307		1,805
Disposal	(164)		(8)
Amortization	(14,413)		(14,114)
Impairment loss	(22)	[1]	(14)	[2]
Others	221,572	[3]	48,190
Ending balance	426,364		217,084		181,225
Others | Acquisition cost
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	333,621		297,289		297,289
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	333,621		297,289
Changes in intangible assets other than goodwill
Ending balance	557,749		333,621		297,289
Others | Accumulated amortization
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	(104,486)		(103,995)		(103,995)
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(104,486)		(103,995)
Changes in intangible assets other than goodwill
Ending balance	(119,446)		(104,486)		(103,995)
Others | Accumulated impairment [Member]
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	(12,051)		(12,069)		(12,069)
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(12,051)		(12,069)
Changes in intangible assets other than goodwill
Ending balance	(11,939)		(12,051)		(12,069)
Others | Government grants
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	0		0		0
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	0		0
Changes in intangible assets other than goodwill
Acquisition	0		0
Disposal	0		0
Amortization	2		0
Impairment loss	0	[1]	0	[2]
Others	(81)	[3]	0
Ending balance	(79)		0		0
Goodwill
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	2,582		2,582		2,582
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	2,582		2,582
Changes in intangible assets other than goodwill
Acquisition	95,395		0
Disposal	0		0
Amortization	0		0
Impairment loss	0		0
Others	0		0
Ending balance	97,977		2,582		2,582
Goodwill | Acquisition cost
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	2,582		2,582		2,582
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	2,582		2,582
Changes in intangible assets other than goodwill
Ending balance	₩ 97,977		₩ 2,582		₩ 2,582
[1]	KEPCO Australia Pty., Ltd. and KEPCO Bylong Australia Pty., Ltd., 100% owned subsidiaries, performed an impairment test over the mining rights and the Company recognized the amount of the carrying amount in excess of its recoverable amount as an impairment loss.
[2]	Includes W8,104 million of impairment loss on the intangible assets under development in relation to the technology development of heat transfer tube owned by KEPCO Nuclear Fuel Co., Ltd., 96.36% owned subsidiary, is.
[3]	'Others' include the business rights amounting to KRW172,434 million increased from the business combination between Korea East-West Power Co., Ltd. and Eumseong Natural Gas Power Co., Ltd. (see note 51)

Intangible Assets other than _3

Intangible Assets other than Goodwill (Details) $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2019KRW (₩)	Dec. 31, 2018KRW (₩)	Dec. 31, 2019AUD ($)	Dec. 31, 2018AUD ($)
Software | ERP system and others
Disclosure of intangible assets material to entity [Line Items]
Carrying value	₩ 432	₩ 783
Remaining amortisation period of intangible assets material to entity	1 years and 2 months ~ 1 years and 4 months	2 years and 2 months ~ 2 years and 4 months
Software | Electricity sales information system
Disclosure of intangible assets material to entity [Line Items]
Carrying value	₩ 4,824	₩ 6,477
Remaining amortisation period of intangible assets material to entity	3 years	4 years
Copyrights, patents rights and other industrial rights | Smart technology verification and standard design project conducting right
Disclosure of intangible assets material to entity [Line Items]
Carrying value	₩ 6,787	₩ 9,256
Remaining amortisation period of intangible assets material to entity	2 years and 9 months	3 years and 9 months
Copyrights, patents rights and other industrial rights | Contributions to ARP NRC DC
Disclosure of intangible assets material to entity [Line Items]
Carrying value	₩ 34,755	₩ 46,594
Remaining amortisation period of intangible assets material to entity	8 years	9 years
Mining rights | Mining right of Bylong mine
Disclosure of intangible assets material to entity [Line Items]
Carrying value | $			$ 0	$ 401,225
Remaining amortisation period of intangible assets material to entity	The carrying amount of mining right does not exist, because KEPCO Australia Pty., Ltd. and KEPCO Bylong Australia Pty., Ltd. recognized impairment losses in full during the year ended December 31, 2019.	Mining rights are amortized using the units-of-production method and the amortization has not commenced yet.
Development expenditures | Electricity sales information system
Disclosure of intangible assets material to entity [Line Items]
Carrying value	₩ 15,283	₩ 22,337
Remaining amortisation period of intangible assets material to entity	2 years and 3 months	3 years and 3 months
Usage rights of donated assets and other | Dangjin power plant load facility usage right
Disclosure of intangible assets material to entity [Line Items]
Carrying value	₩ 7,870	₩ 14,167
Remaining amortisation period of intangible assets material to entity	1 years 3 months	2 years 3 months
Usage rights of donated assets and other | Sejong Haengbogdosi sharing charge
Disclosure of intangible assets material to entity [Line Items]
Carrying value	₩ 31,385	₩ 35,923
Remaining amortisation period of intangible assets material to entity	6 years and 11 months	7 years and 11 months
Others | Occupancy and use of public waters
Disclosure of intangible assets material to entity [Line Items]
Carrying value	₩ 92,446	₩ 97,858
Remaining amortisation period of intangible assets material to entity	17 years 1 months	18 years 1 months
Others | Business rights
Disclosure of intangible assets material to entity [Line Items]
Carrying value	₩ 171,955
Remaining amortisation period of intangible assets material to entity	29 years 11 months

Research and development expens

Research and development expenses (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Research and Development Expense [Abstract]
Research and development expense	₩ 735,715	₩ 723,888	₩ 721,437

Trade and Other Payables (Detai

Trade and Other Payables (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2019	Dec. 31, 2018
Trade and other payables [Line Items]
Trade payables	₩ 2,859,721	₩ 3,411,830
Other trade payables	4,399,373	4,257,736
Accrued expenses	1,030,902	1,129,655
Leasehold deposits received	3,280	3,033
Other deposits received	232,084	241,770
Lease liabilities	5,070,133	283,806
Dividends payable	6,851	6,443
Trade and other payables Others
Advance received from local governments	5,818	5,818
Others	7,000	7,000
Others	12,818	12,818
Total trade and other payables	13,615,162	9,347,091
Current trade and other payables
Trade and other payables [Line Items]
Trade payables	2,859,721	3,411,830
Other trade payables	1,952,659	1,630,860
Accrued expenses	1,028,869	1,127,796
Leasehold deposits received	2,571	1,949
Other deposits received	163,382	169,317
Lease liabilities	635,349	57,200
Dividends payable	6,851	6,443
Trade and other payables Others
Advance received from local governments	0	0
Others	0	0
Others	0	0
Total trade and other payables	6,649,402	6,405,395
Non-current trade and other payables
Trade and other payables [Line Items]
Trade payables	0	0
Other trade payables	2,446,714	2,626,876
Accrued expenses	2,033	1,859
Leasehold deposits received	709	1,084
Other deposits received	68,702	72,453
Lease liabilities	4,434,784	226,606
Dividends payable	0	0
Trade and other payables Others
Advance received from local governments	5,818	5,818
Others	7,000	7,000
Others	12,818	12,818
Total trade and other payables	₩ 6,965,760	₩ 2,941,696

Borrowings and Debt Securitie_2

Borrowings and Debt Securities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2019	Dec. 31, 2018
Current Borrowings and Debt Securities
Short-term borrowings	₩ 1,098,555	₩ 860,602
Current portion of long-term borrowings	217,579	312,994
Current portion of debt securities	7,545,485	6,790,778
Less : Current portion of discount on long-term borrowings	(1,000)	(972)
Less : Current portion of discount on debt securities	(2,780)	(1,974)
Add : Current portion of premium on debt securities	0	20
Current Borrowings and Debt Securities	8,857,839	7,961,448
Non-current Borrowings and Debt Securities
Long-term borrowings	3,411,052	3,280,015
Debt securities	55,716,183	49,905,077
Less : Discount on long-term borrowings	(21,309)	(22,000)
Less : Discount on debt securities	(88,920)	(89,913)
Add : Premium on debt securities	1,696	0
Non-current Borrowings and Debt Securities	59,018,702	53,073,179
Total	₩ 67,876,541	₩ 61,034,627

Borrowings and Debt Securitie_3

Borrowings and Debt Securities - Repayment schedule of borrowings and debt securities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2019	Dec. 31, 2018
Repayment schedule of borrowings and debt securities [Line Items]
Borrowings	₩ 4,727,186	₩ 4,453,611
Debt Securities	63,261,668	56,695,855
Less than 1 year
Repayment schedule of borrowings and debt securities [Line Items]
Borrowings	1,316,134	1,173,596
Debt Securities	7,545,485	6,790,778
1~5 Years
Repayment schedule of borrowings and debt securities [Line Items]
Borrowings	2,113,404	1,911,226
Debt Securities	31,552,963	30,175,734
Over 5 Years
Repayment schedule of borrowings and debt securities [Line Items]
Borrowings	1,297,648	1,368,789
Debt Securities	₩ 24,163,220	₩ 19,729,343

Borrowings and Debt Securitie_4

Borrowings and Debt Securities : Short-term borrowings (Details) ₱ in Thousands, $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2019KRW (₩)	Dec. 31, 2018KRW (₩)	Dec. 31, 2019USD ($)	Dec. 31, 2019PHP (₱)	Dec. 31, 2018USD ($)	Dec. 31, 2018PHP (₱)
Disclosure of detailed information about Short-term borrowings [Line Items]
Short-term borrowings	₩ 1,098,555	₩ 860,602
Local short-term borrowings
Disclosure of detailed information about Short-term borrowings [Line Items]
Name of Creditor		KTB Investment and securities and others
Borrowings interest rate		2.05~2.51
Borrowings, maturity		2019.01.04~ 2019.02.20
Short-term borrowings		₩ 674,000
Local short-term borrowings
Disclosure of detailed information about Short-term borrowings [Line Items]
Name of Creditor	DB financial investment and others
Borrowings interest rate	2.00~2.20
Borrowings, maturity	2020.01.13~ 2020.02.05
Short-term borrowings	₩ 280,000
Foreign short-term borrowings
Disclosure of detailed information about Short-term borrowings [Line Items]
Name of Creditor		SCNT and others
Borrowings interest rate		4.60~6.50
Borrowings, maturity		2019.12.03
Short-term borrowings		₩ 10,013			$ 8,955
Foreign short-term borrowings
Disclosure of detailed information about Short-term borrowings [Line Items]
Name of Creditor	BDO Unibank	BDO Unibank
Borrowings interest rate	3.92	6.59
Borrowings, maturity	2020.12.20	2020.12.17 (*) The contractual maturity is 2020 but is classified as short-term borrowing due to intention of early payment in 3 months after borrowing.
Short-term borrowings	₩ 5,130	₩ 9,581		₱ 225,000		₱ 450,000
Foreign short-term borrowings
Disclosure of detailed information about Short-term borrowings [Line Items]
Name of Creditor	LG-CNS
Borrowings interest rate	4.6
Borrowings, maturity	2020.06.30
Short-term borrowings	₩ 27,439		$ 23,699
Foreign short-term borrowings
Disclosure of detailed information about Short-term borrowings [Line Items]
Name of Creditor	Mizuho Bank
Borrowings interest rate	4.6
Borrowings, maturity	2020.06.30
Short-term borrowings	₩ 12,767		$ 11,027
Local bank overdraft
Disclosure of detailed information about Short-term borrowings [Line Items]
Name of Creditor		Nonghyup Bank
Borrowings interest rate		2.59~3.09
Borrowings, maturity		2019.01.10~ 2019.12.31
Short-term borrowings		₩ 142,773
Local bank overdraft
Disclosure of detailed information about Short-term borrowings [Line Items]
Name of Creditor		Woori Bank
Borrowings interest rate		Standard overdraft rate+1.09
Borrowings, maturity		2019.02.26
Short-term borrowings		₩ 24,235
Local bank overdraft
Disclosure of detailed information about Short-term borrowings [Line Items]
Name of Creditor	Korea development Bank and others
Borrowings interest rate	1.98~2.75
Borrowings, maturity	2020.01.01 ~2020.04.16
Short-term borrowings	₩ 373,219
Electronic short-term bonds
Disclosure of detailed information about Short-term borrowings [Line Items]
Name of Creditor	Mirae asset daewoo and others
Borrowings interest rate	1.72~2.20
Borrowings, maturity	2020.01.10 ~2020.02.05
Short-term borrowings	₩ 400,000

Borrowings and Debt Securitie_5

Borrowings and Debt Securities : Long-term borrowings (Details) ₨ in Thousands, ¥ in Thousands, Rp in Thousands, JD in Thousands, $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2019KRW (₩)	Dec. 31, 2018KRW (₩)	Dec. 31, 2019USD ($)	Dec. 31, 2019JOD (JD)	Dec. 31, 2019JPY (¥)	Dec. 31, 2019PKR (₨)	Dec. 31, 2018USD ($)	Dec. 31, 2018JOD (JD)	Dec. 31, 2018JPY (¥)	Dec. 31, 2018IDR (Rp)	Dec. 31, 2018PKR (₨)
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings	₩ 3,628,631	₩ 3,593,009
Less : Discount on long-term borrowings	(22,309)	(22,972)
Less : Current portion of long-term borrowings	(217,579)	(312,994)
Add : Current portion of discount on long-term borrowings	1,000	972
Long-term borrowings	3,389,743	3,258,015
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings	₩ 2,283,166	₩ 1,914,531
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Korea Development Bank	Korea Development Bank
Purpose of borrowings	Others	Others
Borrowings interest rate	0.50	0.50
Borrowings, maturity	2020~2044	2019~2044
Borrowings	₩ 3,500	₩ 4,154
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Korea Development Bank	Korea Development Bank
Purpose of borrowings	Facility	Facility
Borrowings interest rate	2.50~4.60	2.45~4.60
Borrowings, maturity	2023~2028	2023~2028
Borrowings	₩ 59,845	₩ 66,793
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Korea Development Bank	Korea Development Bank
Purpose of borrowings	Operating funds	Operating funds
Borrowings interest rate	2.33~3.04	2.59~3.04
Borrowings, maturity	2020~2022	2020~2021
Borrowings	₩ 55,000	₩ 67,000
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Korea Development Bank	Korea Development Bank
Purpose of borrowings	Operating funds	Operating funds
Borrowings interest rate	1yr KoFC bond rate+0.95	1yr KoFC bond rate+0.95
Borrowings, maturity	2020~2022	2020
Borrowings	₩ 24,000	₩ 14,000
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	KEB Hana Bank	KEB Hana Bank
Purpose of borrowings	Commercial Paper	Commercial Paper
Borrowings interest rate	3M CD+0.13~0.32	3M CD+0.24~0.32
Borrowings, maturity	2021~2024	2021~2022
Borrowings	₩ 1,150,000	₩ 950,000
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	KEB Hana Bank	KEB Hana Bank
Purpose of borrowings	Facility	Facility
Borrowings interest rate	4.60	4.60
Borrowings, maturity	2028	2028
Borrowings	₩ 12,466	₩ 13,781
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	KEB Hana Bank	KEB Hana Bank
Purpose of borrowings	Facility	Facility
Borrowings interest rate	3yr KTB rate-1.25	3yr KTB rate-1.25
Borrowings, maturity	2020~2028	2019~2028
Borrowings	₩ 6,699	₩ 8,072
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	IBK	IBK
Purpose of borrowings	PF Refinancing	PF Refinancing
Borrowings interest rate	CD+1.25	CD+1.25
Borrowings, maturity	2030	2030
Borrowings	₩ 10,497	₩ 22,500
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Export-Import Bank of Korea	Export-Import Bank of Korea
Purpose of borrowings	Project loans	Project loans
Borrowings interest rate	1.5	1.5
Borrowings, maturity	2026	2026
Borrowings	₩ 19,150	₩ 22,096
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Export-Import Bank of Korea	Export-Import Bank of Korea
Purpose of borrowings	Operating funds	Operating funds
Borrowings interest rate	2.21	2.21
Borrowings, maturity	2020	2020
Borrowings	₩ 35,000	₩ 35,000
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Korea Energy Agency	Korea Energy Agency
Purpose of borrowings	Development of power resouces	Development of power resouces
Borrowings interest rate	3yr KTB rate-2.25	3yr KTB rate-2.25
Borrowings, maturity	2023~2025	2023~2025
Borrowings	₩ 4,350	₩ 5,558
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Korea Energy Agency	Korea Energy Agency
Purpose of borrowings	Facility	Facility
Borrowings interest rate	3yr KTB rate-2.25	3yr KTB rate-2.25
Borrowings, maturity	2020~2024	2019~2024
Borrowings	₩ 2,058	₩ 2,589
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Korea Energy Agency	Korea Energy Agency
Purpose of borrowings	Project loans	Project loans
Borrowings interest rate	-	-
Borrowings, maturity	2023	2023
Borrowings	₩ 1,197	₩ 1,197
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Korea Energy Agency	Korea Energy Agency
Purpose of borrowings	Others	Others
Borrowings interest rate	KTB rate-2.25	KTB rate -2.25
Borrowings, maturity	2024~2028	2024~2028
Borrowings	₩ 15,696	₩ 17,347
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor		Shinhan Bank
Purpose of borrowings		Collateral borrowing
Borrowings interest rate		2.32
Borrowings, maturity		2019
Borrowings		₩ 30,000
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Shinhan Bank	Shinhan Bank
Purpose of borrowings	Facility	Facility
Borrowings interest rate	CB rate+1.10	CB rate+1.10
Borrowings, maturity	2028	2028
Borrowings	₩ 18,698	₩ 20,672
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Shinhan Bank	Shinhan Bank
Purpose of borrowings	Others	Others
Borrowings interest rate	3.95	3.95
Borrowings, maturity	2035	2035
Borrowings	₩ 99,146	₩ 103,851
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Shinhan Bank	Shinhan Bank
Purpose of borrowings	Others	Others
Borrowings interest rate	Standard overdraft rate+1.00	Standard overdraft rate +1.00
Borrowings, maturity	2035	2035
Borrowings	₩ 99,146	₩ 103,851
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Kookmin Bank	Kookmin Bank
Purpose of borrowings	Facility	Facility
Borrowings interest rate	MOR+0.79	MOR+0.79
Borrowings, maturity	2023	2023
Borrowings	₩ 23,333	₩ 30,333
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Kookmin Bank	Kookmin Bank
Purpose of borrowings	Facility	Facility
Borrowings interest rate	3.16	3.16
Borrowings, maturity	2020	2020
Borrowings	₩ 10,000	₩ 10,000
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Other Creditors	Other Creditors
Purpose of borrowings	Facility	Facility
Borrowings interest rate	1.75~6.80	1.75~4.60
Borrowings, maturity	2026~2036	2026~2036
Borrowings	₩ 390,044	₩ 168,080
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Other Creditors	Other Creditors
Purpose of borrowings	Facility	Facility
Borrowings interest rate	CB rate+1.10~1.60 Standard overdraft rate+2.45	CB rate+1.10~1.20
Borrowings, maturity	2023~2036	2023~2036
Borrowings	₩ 111,834	₩ 52,810
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Other Creditors	Other Creditors
Purpose of borrowings	PF Refinancing	PF Refinancing
Borrowings interest rate	4.1	4.1
Borrowings, maturity	2030	2030
Borrowings	₩ 29,159	₩ 62,500
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Other Creditors	Other Creditors
Purpose of borrowings	Others	Others
Borrowings interest rate	4.50~7.90	4.50~7.90
Borrowings, maturity	2022~2039	2022~2039
Borrowings	₩ 102,348	₩ 102,347
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings	₩ 1,345,465	₩ 1,678,478
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Korea Energy Agency	Korea Energy Agency
Purpose of borrowings	Project loans	Project loans
Borrowings interest rate	-	-
Borrowings, maturity	2021~2023	2021~2023
Borrowings	₩ 10,123	₩ 9,776	$ 8,744				$ 8,744
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Export-Import Bank of Korea and others	Export-Import Bank of Korea and others
Purpose of borrowings	Direct loan and others	Direct loan and others
Borrowings interest rate	1M Libor+1.80~3.20	1M Libor+1.80~3.20
Borrowings, maturity	2036	2036
Borrowings	₩ 117,994	₩ 138,542	101,912				123,909
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Export-Import Bank of Korea and others	Export-Import Bank of Korea and others
Purpose of borrowings	Direct loan and others	Direct loan and others
Borrowings interest rate	3M Libor+2.75~3.70	3M Libor+2.75~3.70
Borrowings, maturity	2027	2027
Borrowings	₩ 239,039	₩ 249,783		JD 146,380				JD 158,524
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor		Export-Import Bank of Korea and others
Purpose of borrowings		Commercial loan and others
Borrowings interest rate		3M Libor+1.50~2.50
Borrowings, maturity		2030~2033
Borrowings		₩ 310,315					277,538
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Export-Import Bank of Korea and others	Export-Import Bank of Korea and others
Purpose of borrowings	PF Loan	PF Loan
Borrowings interest rate	6M Libor+2.50~2.70	6M Libor+1.70~2.50
Borrowings, maturity	2032	2032
Borrowings	₩ 137,412	₩ 141,773	118,684				126,798
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Export-Import Bank of Korea and others	Export-Import Bank of Korea and others
Purpose of borrowings	Others	Others
Borrowings interest rate	3.88	3.88
Borrowings, maturity	2021	2021
Borrowings	₩ 334,685	₩ 310,427	289,709				278,105
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	SCNT and others	SCNT and others
Purpose of borrowings	Shareholder's loan	Shareholder's loan
Borrowings interest rate	6.50~8.00	6.50~8.00
Borrowings, maturity	2023	2023
Borrowings	₩ 15,051	₩ 49,956	13,000				44,680
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	SCNT and others	SCNT and others
Purpose of borrowings	Shareholder's loan	Shareholder's loan
Borrowings interest rate	8	8
Borrowings, maturity	2031	2031
Borrowings	₩ 7,925	₩ 7,647		JD 4,853				JD 4,853
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor		PT PJB
Purpose of borrowings		Shareholder's loan
Borrowings interest rate		12.75
Borrowings, maturity		2019
Borrowings		₩ 428								Rp 5,569,304
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Samsung Life Insurance and others	Samsung Life Insurance and others
Purpose of borrowings	Syndicated loan	Syndicated loan
Borrowings interest rate	3.10	3.10
Borrowings, maturity	2032	2032
Borrowings	₩ 52,972	₩ 53,565			¥ 4,981,038				¥ 5,286,835
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Woori Bank and others	Woori Bank and others
Purpose of borrowings	Syndicated loan	Syndicated loan
Borrowings interest rate	JPY 6M Libor+2.00	JPY 6M Libor +2.00
Borrowings, maturity	2032	2032
Borrowings	₩ 34,171	₩ 34,553			¥ 3,213,121				¥ 3,410,381
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor		SMBC and others
Purpose of borrowings		Equity Bridge Loan
Borrowings interest rate		1M Libor+0.90
Borrowings, maturity		2019
Borrowings		₩ 49,218					44,019
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	IFC and others	IFC and others
Purpose of borrowings	Others	Others
Borrowings interest rate	6M Libor+5.00	6M Libor+5.00
Borrowings, maturity	2031	2031
Borrowings	₩ 278,652	₩ 206,944				₨ 37,252,930					₨ 25,900,420
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Federal Financing Bank	Federal Financing Bank
Purpose of borrowings	PF loan	PF loan
Borrowings interest rate	2.39~13	2.39~13
Borrowings, maturity	2031~2038	2031~2038
Borrowings	₩ 117,377	₩ 114,406	101,380				102,322
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Other Creditors	Other Creditors
Purpose of borrowings	Others	Others
Borrowings interest rate	-	-
Borrowings, maturity	-	2019
Borrowings	₩ 64	₩ 1,145	$ 57				$ 1,025

Borrowings and Debt Securitie_6

Borrowings and Debt Securities : Local debt securities and Foreign debt securities (Details) € in Thousands, kr in Thousands, SFr in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, ₩ in Millions

12 Months Ended

Dec. 31, 2019KRW (₩)

Dec. 31, 2018KRW (₩)

Dec. 31, 2019USD ($)

Dec. 31, 2019EUR (€)

Dec. 31, 2019AUD ($)

Dec. 31, 2019CHF (SFr)

Dec. 31, 2019HKD ($)

Dec. 31, 2019SEK (kr)

Dec. 31, 2018USD ($)

Dec. 31, 2018EUR (€)

Dec. 31, 2018AUD ($)

Dec. 31, 2018CHF (SFr)

Dec. 31, 2018HKD ($)

Dec. 31, 2018SEK (kr)

Debt Instrument [Line Items]

Bonds issued

₩ 63,261,668

₩ 56,695,855

Less : Discount on debt securities

(91,700)

(91,887)

Add : Premium on debt securities

1,696

20

Less : Current portion of debt securities

(7,545,485)

(6,790,778)

Add : Current portion of discount on debt securities

2,780

1,974

Less: Current portion of premium on foreign debt securities

0

(20)

Total

55,628,959

49,815,164

Local Debt securities

Debt Instrument [Line Items]

Bonds issued

52,913,577

47,703,228

Less : Discount on debt securities

(42,274)

(41,247)

Less : Current portion of debt securities

(6,340,000)

(5,330,000)

Add : Current portion of discount on debt securities

1,409

1,035

Total

₩ 46,532,712

₩ 42,333,016

Electricity Bonds

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2010.04.08~ 2019.12.30

2009.12.03~ 2018.12.04

Debt Instrument, Maturity Date, Description

2020.01.12~ 2049.10.24

2019.01.08~ 2048.10.29

Interest rate (%)

1.32~5.26

1.62~5.45

Bonds issued

₩ 28,450,000

₩ 24,480,000

Corporate bonds

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

[1]

2009.10.16~ 2019.12.19

2009.05.04~ 2018.11.09

Debt Instrument, Maturity Date, Description

[1]

2020.02.22~ 2049.12.19

2019.01.21~2048.11.09

Interest rate (%)

[1]

1.29~6.00

1.36~6.00

Bonds issued

[1]

₩ 24,463,577

₩ 23,223,228

Foreign Debt securities

Debt Instrument [Line Items]

Bonds issued

10,348,091

8,992,627

Less : Discount on debt securities

(49,426)

(50,640)

Add : Premium on debt securities

1,696

20

Less : Current portion of debt securities

(1,205,485)

(1,460,778)

Add : Current portion of discount on debt securities

1,371

939

Less: Current portion of premium on foreign debt securities

0

(20)

Total

₩ 9,096,247

₩ 7,482,148

FY-96

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

1996.04.01~1996.12.06

1996.04.01~1996.12.06

Debt Instrument, Maturity Date, Description

2026.12.01~2096.04.01

2026.12.01~2096.04.01

Interest rate (%)

6.00~7.95

6.00~8.37

Bonds issued

₩ 288,379

₩ 278,488

$ 249,074

$ 249,071

FY-97

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

1997.01.31~1997.08.04

1997.01.31~1997.08.04

Debt Instrument, Maturity Date, Description

2027.02.01~2027.08.01

2027.02.01~2027.08.01

Interest rate (%)

6.75~7.00

6.75~7.00

Bonds issued

₩ 364,379

₩ 351,885

314,717

314,717

FY-04

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2004.04.23

2004.04.23

Debt Instrument, Maturity Date, Description

2034.04.23

2034.04.23

Interest rate (%)

5.13

5.13

Bonds issued

₩ 332,196

₩ 320,805

286,920

286,920

FY-11

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2011.07.13

2011.07.13

Debt Instrument, Maturity Date, Description

2021.07.13

2021.07.13

Interest rate (%)

4.75

4.75

Bonds issued

₩ 578,900

₩ 559,050

500,000

500,000

FY-12

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2012.09.19

2012.09.19

Debt Instrument, Maturity Date, Description

2022.09.19

2022.09.19

Interest rate (%)

3

3

Bonds issued

₩ 868,350

₩ 838,575

750,000

750,000

FY-13

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2013.09.26~2013.10.23

Debt Instrument, Maturity Date, Description

2019.03.26~2019.04.23

Interest rate (%)

1.50~1.63

Bonds issued

₩ 454,488

SFr 400,000

FY-13

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2013.09.25

2013.09.25

Debt Instrument, Maturity Date, Description

2020.09.25

2020.09.25

Interest rate (%)

5.75

5.75

Bonds issued

₩ 263,361

₩ 256,038

$ 325,000

$ 325,000

FY-14

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2014.07.30~2014.12.02

2014.02.11~2014.12.02

Debt Instrument, Maturity Date, Description

2020.06.02~2029.07.30

2019.02.11~2029.07.30

Interest rate (%)

2.50~3.57

2.38~3.57

Bonds issued

₩ 694,680

₩ 1,677,150

600,000

1,500,000

FY-15

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2015.06.15

2015.06.15

Debt Instrument, Maturity Date, Description

2025.06.15

2025.06.15

Interest rate (%)

3.25

3.25

Bonds issued

₩ 347,340

₩ 335,430

300,000

300,000

FY-16

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2016.01.21

2016.01.21

Debt Instrument, Maturity Date, Description

2021.07.21

2021.07.21

Interest rate (%)

2.50

2.50

Bonds issued

₩ 347,340

₩ 335,430

300,000

300,000

FY-17

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2017.04.12~2017.07.25

2017.04.12~2017.07.25

Debt Instrument, Maturity Date, Description

2020.04.12~2027.07.25

2020.04.12~2027.07.25

Interest rate (%)

2.38~3.13

2.38~3.13

Bonds issued

₩ 1,273,580

₩ 1,229,910

1,100,000

1,100,000

FY-17

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2017.10.30

2017.10.30

Debt Instrument, Maturity Date, Description

2037.10.30

2037.10.30

Interest rate (%)

1.70

1.70

Bonds issued

₩ 51,897

₩ 51,166

€ 40,000

€ 40,000

FY-17

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2017.11.16

2017.11.16

Debt Instrument, Maturity Date, Description

2037.11.16

2037.11.16

Interest rate (%)

2.36

2.36

Bonds issued

₩ 55,737

₩ 56,061

kr 450,000

kr 450,000

FY-18

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2018.01.29~2018.07.25

2018.01.29~2018.07.25

Debt Instrument, Maturity Date, Description

2021.01.29~2023.07.25

2021.01.29~2023.07.25

Interest rate (%)

3.00~3.88

3.00~3.88

Bonds issued

₩ 2,084,040

₩ 2,012,580

1,800,000

$ 1,800,000

FY-18

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2018.03.13

2018.03.13

Debt Instrument, Maturity Date, Description

2028.03.13

2028.03.13

Interest rate (%)

3.35

3.35

Bonds issued

₩ 245,289

₩ 235,571

$ 1,650,000

$ 1,650,000

FY-19

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2019.01.22~2019.06.24

Debt Instrument, Maturity Date, Description

2022.01.22~2024.06.24

Interest rate (%)

2.50~3.38

Bonds issued

₩ 926,240

$ 800,000

FY-19

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2019.02.27

Debt Instrument, Maturity Date, Description

2024.02.27

Interest rate (%)

0.13

Bonds issued

₩ 239,104

SFr 200,000

FY-19

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2019.07.19

Debt Instrument, Maturity Date, Description

2024.07.19~2027.07.19

Interest rate (%)

0~0.05

Bonds issued

₩ 358,656

SFr 300,000

FY-19

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2019.07.22

Debt Instrument, Maturity Date, Description

2022.07.22

Interest rate (%)

2.38

Bonds issued

₩ 347,340

300,000

FY-19

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2019.10.31

Debt Instrument, Maturity Date, Description

2024.10.30

Interest rate (%)

3M BBSW+97bp

Bonds issued

₩ 243,102

$ 300,000

FY-19

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2019.12.19

Debt Instrument, Maturity Date, Description

2037.12.31

Interest rate (%)

3.3~5.7

Bonds issued

₩ 438,181

$ 378,460

[1]

Corporate bonds of HeeMang Sunlight Power Co., Ltd. amounting to KRW2,697 million can be redeemed every March 31 after five years from its issue date, March 31, 2016.

Disclosure of quantitative info

Disclosure of quantitative information about right-of-use assets (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2019		Dec. 31, 2018
Disclosure of quantitative information about right-of-use assets [Line Items]
Effect of change in accounting policy		₩ 4,947,947		₩ 0
Increase		14,221,355		12,266,870
Depreciation		(581,074)
Right-of-use assets
Disclosure of quantitative information about right-of-use assets [Line Items]
Effect of change in accounting policy		5,143,651
Increase		220,996
Depreciation		(581,074)
Ending balance		4,783,573
Right-of-use assets | Acquisition cost
Disclosure of quantitative information about right-of-use assets [Line Items]
Ending balance		7,574,010
Right-of-use assets | Accumulated depreciation
Disclosure of quantitative information about right-of-use assets [Line Items]
Ending balance		(2,790,437)
Land
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		0
Effect of change in accounting policy		684,386
Increase		8,717
Depreciation		(49,029)
Ending balance		644,074		0
Land | Acquisition cost
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		0
Ending balance		693,103		0
Land | Accumulated depreciation
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		0
Ending balance		(49,029)		0
Buildings
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		0
Effect of change in accounting policy		36,874
Increase		18,106
Depreciation		(20,403)
Ending balance		34,577		0
Buildings | Acquisition cost
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		0
Ending balance		54,980		0
Buildings | Accumulated depreciation
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		0
Ending balance		(20,403)		0
Structures
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		0
Effect of change in accounting policy		20,840
Increase		7,358
Depreciation		(2,554)
Ending balance		25,644		0
Structures | Acquisition cost
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		0
Ending balance		28,198		0
Structures | Accumulated depreciation
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		0
Ending balance		(2,554)		0
Machinery
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		0
Effect of change in accounting policy		0
Increase		1,308
Depreciation		(484)
Ending balance		824		0
Machinery | Acquisition cost
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		0
Ending balance		1,308		0
Machinery | Accumulated depreciation
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		0
Ending balance		(484)		0
Ships
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		0
Effect of change in accounting policy		3,986,947
Increase		126,807
Depreciation		(425,465)
Ending balance		3,688,289		0
Ships | Acquisition cost
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		0
Ending balance		4,113,754		0
Ships | Accumulated depreciation
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		0
Ending balance		(425,465)		0
Vehicles
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		0
Effect of change in accounting policy		11,258
Increase		9,559
Depreciation		(7,109)
Ending balance		13,708		0
Vehicles | Acquisition cost
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		0
Ending balance		20,817		0
Vehicles | Accumulated depreciation
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		0
Ending balance		(7,109)		0
Others
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		0
Effect of change in accounting policy	[1]	403,346
Increase		49,141
Depreciation		(76,030)
Ending balance		376,457	[2]	0
Others | Acquisition cost
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		0
Ending balance		2,661,850	[2]	0
Others | Accumulated depreciation
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		0
Ending balance		₩ (2,285,393)	[2]	₩ 0
[1]	Including transferred amount of KRW195,704 million, which was classified as finance lease assets as of December 31, 2018.
[2]	Including power purchase agreements ("PPA") with GS EPS and two other LNG combined power suppliers.

Lease Liabilities (Details)

Lease Liabilities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2019	Dec. 31, 2018
Disclosure of maturity analysis of operating lease payments [Line Items]
Minimum lease payments		₩ 381,742
Present value of minimum lease payments		283,806
Undiscounted operating lease payments to be received	₩ 5,757,009
Less than 1 year
Disclosure of maturity analysis of operating lease payments [Line Items]
Minimum lease payments		87,709
Present value of minimum lease payments		57,200
Undiscounted operating lease payments to be received	686,445
1~5 Years
Disclosure of maturity analysis of operating lease payments [Line Items]
Minimum lease payments		228,783
Present value of minimum lease payments		170,676
Undiscounted operating lease payments to be received	2,334,883
More than 5 years
Disclosure of maturity analysis of operating lease payments [Line Items]
Minimum lease payments		65,250
Present value of minimum lease payments		₩ 55,930
Undiscounted operating lease payments to be received	₩ 2,735,681

Lease Liabilities _ Liquidity c

Lease Liabilities : Liquidity classification (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2019	Dec. 31, 2018
Lease liabilities [Abstract]
Current lease liabilities	₩ 635,349	₩ 57,200
Non-current lease liabilities	4,434,784	226,606
Total lease liabilities	5,070,133	₩ 283,806
Less : Discount	(686,876)
Undiscounted operating lease payments to be received	₩ 5,757,009

Details of expense relating to

Details of expense relating to lease contracts as lessee (Details) ₩ in Millions	12 Months Ended
	Dec. 31, 2019KRW (₩)
Disclosure - Details of expense relating to lease contracts as lessee [Abstract]
Depreciation of right-of-use assets	₩ 581,074
Interest expenses on lease liabilities	85,950
Leases expenses for short-term leases	20,127
Leases expenses for leases of low-value assets	1,616
Variable lease payments	(15,912)
Total expense relating to lease contracts as lessee	₩ 672,855

Finance Lease Liabilities _ Lea

Finance Lease Liabilities : Lease payments recognized as an expense from a lessee position (Details) ₩ in Millions	12 Months Ended
	Dec. 31, 2018KRW (₩)
Lease and sublease payments recognised as expense [Abstract]
Minimum lease payment	₩ 111,530
Contingent rent payment	₩ (18,872)

Finance Lease Receivables (Deta

Finance Lease Receivables (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2019	Dec. 31, 2018
Disclosure of maturity analysis of finance lease payments receivable [Line Items]
Undiscounted finance lease payments to be received	₩ 2,510,564	₩ 1,925,452
Present value of minimum lease payment		983,346
Less : Unearned finance income	(1,331,723)
Net investment in finance lease	1,178,841
Gross amount | Not Later Than 1 Year
Disclosure of maturity analysis of finance lease payments receivable [Line Items]
Undiscounted finance lease payments to be received	173,093	124,918
Present value of minimum lease payment		84,688
Gross amount | 1~5 Years
Disclosure of maturity analysis of finance lease payments receivable [Line Items]
Undiscounted finance lease payments to be received	596,819	467,518
Present value of minimum lease payment		223,622
Gross amount | 1~2 Years
Disclosure of maturity analysis of finance lease payments receivable [Line Items]
Undiscounted finance lease payments to be received	150,895
Gross amount | 2~3 Years
Disclosure of maturity analysis of finance lease payments receivable [Line Items]
Undiscounted finance lease payments to be received	150,596
Gross amount | 3~4 Years
Disclosure of maturity analysis of finance lease payments receivable [Line Items]
Undiscounted finance lease payments to be received	149,364
Gross amount | 4~5 Years
Disclosure of maturity analysis of finance lease payments receivable [Line Items]
Undiscounted finance lease payments to be received	145,964
Gross amount | More than 5 years
Disclosure of maturity analysis of finance lease payments receivable [Line Items]
Undiscounted finance lease payments to be received	₩ 1,740,652	1,333,016
Present value of minimum lease payment		₩ 675,036

Changes in the allowance for do

Changes in the allowance for doubtful accounts of finance lease receivables (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Changes in the allowance for doubtful accounts of finance lease receivables [Abstract]
Beginning balance	₩ 1,133
Bad debt expense	0	₩ 1,133
Reversal of allowance for doubtful accounts	(271)	0
Ending balance	₩ 862	₩ 1,133

Employment benefit obligations

Employment benefit obligations (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2019	Dec. 31, 2018
Employment Benefits [Abstract]
Net defined benefit asset	₩ (1,047)	₩ 0
Net defined benefit obligations	1,925,134	1,638,785
Other long-term employee benefit obligations	4,720	6,284
Employee benefits liabilities, net	₩ 1,928,807	₩ 1,645,069

Principal assumptions on actuar

Principal assumptions on actuarial valuation (Details) - ₩ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure - Principal assumptions on actuarial valuation [Abstract]
Discount rate	1.92%~2.05%	2.24% ~ 2.90%
Future salary and benefit levels	4.39%	4.88%
Weighted average duration	13.23	13.71

Details of expense relating t_2

Details of expense relating to defined benefit plans (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure - Details of expense relating to defined benefit plans [Abstract]
Current service cost	₩ 440,300	₩ 369,899	₩ 392,820
Interest cost	83,619	87,687	79,524
Expected return on plan assets	(41,597)	(42,135)	(31,307)
Past service cost	301,442
Loss from settlement	(2,017)	(767)	(1,055)
Defined benefit	₩ 781,747	₩ 414,684	₩ 439,982

Details of expense relating t_3

Details of expense relating to defined benefit plans by nature (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure - Details of expense relating to defined benefit plans by nature [Abstract]
Defined benefit allocated to Cost of sales	₩ 580,623	₩ 308,672	₩ 332,249
Defined benefit allocated to Selling, general and administrative expense	120,455	51,903	59,111
Defined benefit allocated to others	80,669	54,109	48,622
Defined benefit	₩ 781,747	₩ 414,684	₩ 439,982

Defined benefit plan assets and

Defined benefit plan assets and liabilities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure - Defined benefit plan assets and liabilities [Abstract]
Present value of defined benefit obligation from funded plans	₩ 4,035,400	₩ 3,414,116
Fair value of plan assets	(2,111,313)	(1,775,331)
Net surplus (deficit) in plan	1,924,087	1,638,785
Present value of defined benefit obligation from unfunded plans	0	0
Net liabilities incurred from defined benefit plans	₩ 1,924,087	₩ 1,638,785	₩ 1,476,201

Net defined benefit liability (

Net defined benefit liability (asset) (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of defined benefit plans [Line Items]
Beginning balance		₩ 1,638,785	₩ 1,476,201
Changes in net defined benefit liability (asset)
Current service cost		440,300	369,899	₩ 392,820
Interest expense (income)		42,022
Remeasurement component		(82,550)	167,247
Past service cost		301,442
Loss from settlement		(2,017)	(767)	(1,055)
Contributions by the employers		(348,386)
Actual payments		(65,242)
Others		(267)
Ending balance		1,924,087	1,638,785	1,476,201
Defined benefit obligation
Disclosure of defined benefit plans [Line Items]
Beginning balance		3,414,116	2,951,842
Changes in net defined benefit liability (asset)
Current service cost		440,300	369,899
Interest expense (income)	[1]	83,619	87,687
Remeasurement component		(93,736)	154,939
Past service cost		301,442
Loss from settlement		(2,017)	(767)
Actual payments		(108,057)	(149,454)
Others		(267)	(30)
Ending balance		4,035,400	3,414,116	2,951,842
Plan assets
Disclosure of defined benefit plans [Line Items]
Beginning balance		(1,775,331)	(1,475,641)
Changes in net defined benefit liability (asset)
Interest expense (income)		(41,597)	(42,135)
Remeasurement component		11,186	12,308
Contributions by the employers		(348,386)	(330,064)
Actual payments		42,815	60,201
Ending balance		₩ (2,111,313)	₩ (1,775,331)	₩ (1,475,641)
[1]	Corporate bond (AAA rated) yield at year-end is applied to measure the interest cost on employee benefit obligations.

Details of the fair value of pl

Details of the fair value of plan assets (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2019	Dec. 31, 2018
Disclosure of fair value of plan assets [Abstract]
Equity instruments	₩ 189,235	₩ 96,823
Debt instruments	648,265	510,184
Bank deposit	199,743	275,518
Others	1,074,070	892,806
Plan assets	₩ 2,111,313	₩ 1,775,331

Gain (loss) on remeasurement, n

Gain (loss) on remeasurement, net defined benefit liability (asset) (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Gain (loss) on remeasurement, net defined benefit liability (asset) [Abstract]
Actuarial gain from changes in financial assumptions	₩ (2,916)	₩ 186,428
Experience adjustments	(90,820)	(31,489)
Expected return	11,186	12,308
Total loss (gain) on remeasurement, net defined benefit liability (asset)	₩ (82,550)	₩ 167,247

Provisions (Details)

Provisions (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019		Dec. 31, 2018
Disclosure of other provisions [Line Items]
Net carrying value	₩ 18,180,546		₩ 18,362,212
Reconciliation of changes in other provisions
Beginning balance	18,180,546		18,362,212
Changes in other provisions
Increase in provision	5,619,551		2,783,241
Payment	(2,053,071)		(2,866,381)
Reversal of unused amount	(86,804)		(112,453)
Others	10,547		13,927
Ending balance	21,670,769		18,180,546
Current Provisions
Disclosure of other provisions [Line Items]
Net carrying value	1,594,798		2,137,498
Reconciliation of changes in other provisions
Beginning balance	1,594,798		2,137,498
Changes in other provisions
Ending balance	2,604,721		1,594,798
Noncurrent Provisions
Disclosure of other provisions [Line Items]
Net carrying value	16,585,748		16,224,714
Reconciliation of changes in other provisions
Beginning balance	16,585,748		16,224,714
Changes in other provisions
Ending balance	19,066,048		16,585,748
Provisions for employment benefits
Disclosure of other provisions [Line Items]
Net carrying value	976,347		913,787
Reconciliation of changes in other provisions
Beginning balance	976,347		913,787
Changes in other provisions
Increase in provision	900,033		912,440
Payment	(879,980)		(843,281)
Reversal of unused amount	(20,781)		(6,599)
Others	0		0
Ending balance	975,619		976,347
Provisions for employment benefits | Current Provisions
Disclosure of other provisions [Line Items]
Net carrying value	976,347		913,787
Reconciliation of changes in other provisions
Beginning balance	976,347		913,787
Changes in other provisions
Ending balance	975,619		976,347
Litigation provisions
Disclosure of other provisions [Line Items]
Net carrying value	77,793	[1]	73,576
Reconciliation of changes in other provisions
Beginning balance	77,793	[1]	73,576
Changes in other provisions
Increase in provision	59,366		234,517	[1]
Payment	(17,236)		(216,187)	[1]
Reversal of unused amount	(31,525)		(13,847)	[1]
Others	0		(266)	[1]
Ending balance	88,398		77,793	[1]
Litigation provisions | Current Provisions
Disclosure of other provisions [Line Items]
Net carrying value	40,157		48,621
Reconciliation of changes in other provisions
Beginning balance	40,157		48,621
Changes in other provisions
Ending balance	39,177		40,157
Litigation provisions | Noncurrent Provisions
Disclosure of other provisions [Line Items]
Net carrying value	37,636		24,955
Reconciliation of changes in other provisions
Beginning balance	37,636		24,955
Changes in other provisions
Ending balance	49,221		37,636
Provisions For Nuclear Plants Restoration
Disclosure of other provisions [Line Items]
Net carrying value	15,994,039		13,007,228
Reconciliation of changes in other provisions
Beginning balance	13,388,134		13,007,228
Changes in other provisions
Increase in provision	2,639,562		411,316
Payment	(33,657)		(30,410)
Reversal of unused amount	0		0
Others	0		0
Ending balance	15,994,039		13,388,134
Provisions For Nuclear Plants Restoration | Current Provisions
Disclosure of other provisions [Line Items]
Net carrying value	0		0
Reconciliation of changes in other provisions
Beginning balance	0		0
Changes in other provisions
Ending balance	0		0
Provisions For Nuclear Plants Restoration | Noncurrent Provisions
Disclosure of other provisions [Line Items]
Net carrying value	13,388,134		13,007,228
Reconciliation of changes in other provisions
Beginning balance	13,388,134		13,007,228
Changes in other provisions
Ending balance	15,994,039		13,388,134
Spent fuel recovery provisions
Disclosure of other provisions [Line Items]
Net carrying value	1,291,354		1,339,046
Reconciliation of changes in other provisions
Beginning balance	1,291,354		1,339,046
Changes in other provisions
Increase in provision	440,029		435,007
Payment	(376,103)		(482,699)
Reversal of unused amount	0		0
Others	0		0
Ending balance	1,355,280		1,291,354
Spent fuel recovery provisions | Current Provisions
Disclosure of other provisions [Line Items]
Net carrying value	0		0
Reconciliation of changes in other provisions
Beginning balance	0
Changes in other provisions
Ending balance	401,741		0
Spent fuel recovery provisions | Noncurrent Provisions
Disclosure of other provisions [Line Items]
Net carrying value	1,291,354		1,339,046
Reconciliation of changes in other provisions
Beginning balance	1,291,354		1,339,046
Changes in other provisions
Ending balance	953,539		1,291,354
Radioactive waste recovery provisions
Disclosure of other provisions [Line Items]
Net carrying value	1,685,008		1,638,371
Reconciliation of changes in other provisions
Beginning balance	1,685,008		1,638,371
Changes in other provisions
Increase in provision	209,551		112,815
Payment	(6,787)		(66,178)
Reversal of unused amount	0		0
Others	310		0
Ending balance	1,888,082		1,685,008
Radioactive waste recovery provisions | Current Provisions
Disclosure of other provisions [Line Items]
Net carrying value	4,310		11,494
Reconciliation of changes in other provisions
Beginning balance	4,310		11,494
Changes in other provisions
Ending balance	77,053		4,310
Radioactive waste recovery provisions | Noncurrent Provisions
Disclosure of other provisions [Line Items]
Net carrying value	1,680,698		1,626,877
Reconciliation of changes in other provisions
Beginning balance	1,680,698		1,626,877
Changes in other provisions
Ending balance	1,811,029		1,680,698
PCBs recovery provisions
Disclosure of other provisions [Line Items]
Net carrying value	147,668		180,087
Reconciliation of changes in other provisions
Beginning balance	147,668		180,087
Changes in other provisions
Increase in provision	14,251		4,600
Payment	(8,938)		(13,758)
Reversal of unused amount	0		(23,261)
Others	0		0
Ending balance	152,981		147,668
PCBs recovery provisions | Noncurrent Provisions
Disclosure of other provisions [Line Items]
Net carrying value	147,668		180,087
Reconciliation of changes in other provisions
Beginning balance	147,668		180,087
Changes in other provisions
Ending balance	152,981		147,668
Other recovery provisions
Disclosure of other provisions [Line Items]
Net carrying value	10,477		6,659
Reconciliation of changes in other provisions
Beginning balance	10,477		6,659
Changes in other provisions
Increase in provision	2,020		2,125
Payment	(2,033)		0
Reversal of unused amount			0
Others	309		1,693
Ending balance	10,773		10,477
Other recovery provisions | Noncurrent Provisions
Disclosure of other provisions [Line Items]
Net carrying value	10,477		6,659
Reconciliation of changes in other provisions
Beginning balance	10,477		6,659
Changes in other provisions
Ending balance	10,773		10,477
Power plant regional support program provisions
Disclosure of other provisions [Line Items]
Net carrying value	137,668		153,756
Reconciliation of changes in other provisions
Beginning balance	137,668		153,756
Changes in other provisions
Increase in provision	41,341		46,366
Payment	(48,390)		(71,978)
Reversal of unused amount			0
Others	9,514		9,524
Ending balance	140,133		137,668
Power plant regional support program provisions | Current Provisions
Disclosure of other provisions [Line Items]
Net carrying value	137,668		153,756
Reconciliation of changes in other provisions
Beginning balance	137,668		153,756
Changes in other provisions
Ending balance	140,133		137,668
Transmission regional support program provisions
Disclosure of other provisions [Line Items]
Net carrying value	151,698		243,365
Reconciliation of changes in other provisions
Beginning balance	151,698		243,365
Changes in other provisions
Increase in provision	169,616		141,661
Payment	(181,529)		(233,328)
Reversal of unused amount	0		0
Others	0		0
Ending balance	139,785		151,698
Transmission regional support program provisions | Current Provisions
Disclosure of other provisions [Line Items]
Net carrying value	151,698		243,365
Reconciliation of changes in other provisions
Beginning balance	151,698		243,365
Changes in other provisions
Ending balance	139,785		151,698
Provisions for tax
Disclosure of other provisions [Line Items]
Net carrying value	6,845		61
Reconciliation of changes in other provisions
Beginning balance	6,845		61
Changes in other provisions
Increase in provision			6,821
Payment			0
Reversal of unused amount	(6,847)		0
Others	2		(37)
Ending balance	0		6,845
Provisions for tax | Current Provisions
Disclosure of other provisions [Line Items]
Net carrying value	6,845		61
Reconciliation of changes in other provisions
Beginning balance	6,845		61
Changes in other provisions
Ending balance	0		6,845
Provisions for tax | Noncurrent Provisions
Disclosure of other provisions [Line Items]
Net carrying value	0		0
Reconciliation of changes in other provisions
Beginning balance	0		0
Changes in other provisions
Ending balance	0		0
Provisions for financial guarantee
Disclosure of other provisions [Line Items]
Net carrying value	15,586		23,475
Reconciliation of changes in other provisions
Beginning balance	15,586		23,475
Changes in other provisions
Increase in provision	83,910		1,179
Payment	(16,589)		(67)
Reversal of unused amount	(1,551)		(8,432)
Others	1		(569)
Ending balance	81,357		15,586
Provisions for financial guarantee | Current Provisions
Disclosure of other provisions [Line Items]
Net carrying value	1,320		0
Reconciliation of changes in other provisions
Beginning balance	1,320		0
Changes in other provisions
Ending balance	111		1,320
Provisions for financial guarantee | Noncurrent Provisions
Disclosure of other provisions [Line Items]
Net carrying value	14,266		23,475
Reconciliation of changes in other provisions
Beginning balance	14,266		23,475
Changes in other provisions
Ending balance	81,246		14,266
Provisions for RPS
Disclosure of other provisions [Line Items]
Net carrying value	93,919		271,624
Reconciliation of changes in other provisions
Beginning balance	93,919		271,624
Changes in other provisions
Increase in provision	222,119		297,802
Payment	(313,149)		(475,507)
Reversal of unused amount	0		0
Others	0		0
Ending balance	2,889		93,919
Provisions for RPS | Current Provisions
Disclosure of other provisions [Line Items]
Net carrying value	93,919		271,624
Reconciliation of changes in other provisions
Beginning balance	93,919		271,624
Changes in other provisions
Ending balance	2,889		93,919
Provisions for greenhouse gas emissions obligations
Disclosure of other provisions [Line Items]
Net carrying value	136,187		414,252
Reconciliation of changes in other provisions
Beginning balance	136,187		414,252
Changes in other provisions
Increase in provision	724,002		131,860
Payment	(152,463)		(350,356)
Reversal of unused amount	(25,267)		(59,569)
Others	0		0
Ending balance	682,459		136,187
Provisions for greenhouse gas emissions obligations | Current Provisions
Disclosure of other provisions [Line Items]
Net carrying value	136,187		414,252
Reconciliation of changes in other provisions
Beginning balance	136,187		414,252
Changes in other provisions
Ending balance	682,459		136,187
Others
Disclosure of other provisions [Line Items]
Net carrying value	61,862		96,925
Reconciliation of changes in other provisions
Beginning balance	61,862		96,925
Changes in other provisions
Increase in provision	113,751		44,732
Payment	(16,217)		(82,632)
Reversal of unused amount	(833)		(745)
Others	411		3,582
Ending balance	158,974		61,862
Others | Current Provisions
Disclosure of other provisions [Line Items]
Net carrying value	46,347		80,538
Reconciliation of changes in other provisions
Beginning balance	46,347		80,538
Changes in other provisions
Ending balance			46,347
Others | Noncurrent Provisions
Disclosure of other provisions [Line Items]
Net carrying value	15,515		16,387
Reconciliation of changes in other provisions
Beginning balance	₩ 15,515		16,387
Changes in other provisions
Ending balance			₩ 15,515
[1]	As described in Note 50.(1), the Company believes that the possibility of economic benefit outflow is probable on the request for additional construction costs of Hyundai E&C, GS Engineering & Construction Corp. and Hansol SeenTec Co., Ltd. For this reason, the Company recognized W204,787 million of provision in addition to property, plant and equipment.

Changes in government grants (D

Changes in government grants (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Government grants [Line Items]
Government grants	₩ (522,476)	₩ (537,152)
Changes in government grants
Beginning balance	(522,476)	(537,152)
Receipt	(21,705)	(30,416)
Acquisitions	12,338	18,239
Offset the items of depreciation expense and others	37,331	40,028
Disposals	3,196	4,124
Others	(14,860)	(17,299)
Ending balance	(506,176)	(522,476)
Cash
Government grants [Line Items]
Government grants	0	0
Changes in government grants
Beginning balance	0	0
Receipt	(21,705)	(30,416)
Acquisitions	0	0
Offset the items of depreciation expense and others	0	0
Disposals	0	0
Others	21,705	30,416
Ending balance	0	0
Land
Government grants [Line Items]
Government grants	(21,968)	(21,968)
Changes in government grants
Beginning balance	(21,968)	(21,968)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	0	0
Disposals	151	0
Others	0	0
Ending balance	(21,817)	(21,968)
Buildings
Government grants [Line Items]
Government grants	(63,189)	(63,539)
Changes in government grants
Beginning balance	(63,189)	(63,539)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	6,214	6,836
Disposals	0	31
Others	(4,945)	(6,517)
Ending balance	(61,920)	(63,189)
Structures
Government grants [Line Items]
Government grants	(190,854)	(196,414)
Changes in government grants
Beginning balance	(190,854)	(196,414)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	9,373	10,292
Disposals	2,405	3,270
Others	(7,478)	(8,002)
Ending balance	(186,554)	(190,854)
Machinery
Government grants [Line Items]
Government grants	(173,242)	(183,188)
Changes in government grants
Beginning balance	(173,242)	(183,188)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	17,993	18,099
Disposals	635	823
Others	(4,293)	(8,976)
Ending balance	(158,907)	(173,242)
Vehicles
Government grants [Line Items]
Government grants	(4,220)	(6,322)
Changes in government grants
Beginning balance	(4,220)	(6,322)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	2,170	2,146
Disposals	5	0
Others	(230)	(44)
Ending balance	(2,275)	(4,220)
Equipment
Government grants [Line Items]
Government grants	(418)	(761)
Changes in government grants
Beginning balance	(418)	(761)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	262	365
Disposals	0	0
Others	(85)	(22)
Ending balance	(241)	(418)
Tools
Government grants [Line Items]
Government grants	(675)	(1,027)
Changes in government grants
Beginning balance	(675)	(1,027)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	281	432
Disposals	0	0
Others	(9)	(80)
Ending balance	(403)	(675)
Construction in progress
Government grants [Line Items]
Government grants	(54,740)	(49,084)
Changes in government grants
Beginning balance	(54,740)	(49,084)
Receipt	0	0
Acquisitions	12,338	18,239
Offset the items of depreciation expense and others	0	0
Disposals	0	0
Others	(18,809)	(23,895)
Ending balance	(61,211)	(54,740)
Finance lease assets
Government grants [Line Items]
Government grants	(26)	(27)
Changes in government grants
Beginning balance	(26)	(27)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	0	1
Disposals	0	0
Others	26	0
Ending balance	0	(26)
Investment properties
Government grants [Line Items]
Government grants	(50)	(83)
Changes in government grants
Beginning balance	(50)	(83)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	1	1
Disposals	0	0
Others	36	32
Ending balance	(13)	(50)
Software
Government grants [Line Items]
Government grants	(420)	(486)
Changes in government grants
Beginning balance	(420)	(486)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	202	254
Disposals	0	0
Others	(17)	(188)
Ending balance	(235)	(420)
Development expenditures
Government grants [Line Items]
Government grants	(2,110)	(3,702)
Changes in government grants
Beginning balance	(2,110)	(3,702)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	833	1,591
Disposals	0	0
Others	(215)	1
Ending balance	(1,492)	(2,110)
Intangible assets under development
Government grants [Line Items]
Government grants	(10,564)	(10,540)
Changes in government grants
Beginning balance	(10,564)	(10,540)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	0	0
Disposals	0	0
Others	(465)	(24)
Ending balance	(11,029)	(10,564)
Usage rights of donated assets and other
Government grants [Line Items]
Government grants	0	(11)
Changes in government grants
Beginning balance	0	(11)
Receipt		0
Acquisitions		0
Offset the items of depreciation expense and others		11
Disposals		0
Others		0
Ending balance		0
Others
Government grants [Line Items]
Government grants	0	0
Changes in government grants
Beginning balance	0	0
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	2	0
Disposals	0	0
Others	(81)	0
Ending balance	₩ (79)	₩ 0

Deferred Revenues (Details)

Deferred Revenues (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Deferred Revenue [Abstract]
Deferred Revenue, Beginning Balance	₩ 8,606,563	₩ 8,325,181
Increase during the current year / period	1,199,783	875,930
Recognized as revenue during the current year / period	(604,808)	(594,548)
Deferred Revenue, Ending Balance	₩ 9,201,538	₩ 8,606,563

Non-financial Liabilities (Deta

Non-financial Liabilities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2019	Dec. 31, 2018
Other Current Liabilities
Disclosure - Other liabilities [Line Items]
Advances received	₩ 3,825,240	₩ 3,724,238
Unearned revenue	30,988	63,038
Deferred revenue	590,928	556,072
Withholdings	160,977	172,454
Other nonfincial liabilities	1,080,220	1,058,239
Total	5,688,353	5,574,041
Other Noncurrent Liabilities
Disclosure - Other liabilities [Line Items]
Advances received	192,863	80,937
Unearned revenue	6,589	4,690
Deferred revenue	8,610,610	8,050,491
Withholdings	10,901	10,856
Other nonfincial liabilities	13,489	13,059
Total	₩ 8,834,452	₩ 8,160,033

Details of shares issued (Detai

Details of shares issued (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2019	Dec. 31, 2018
Common shares [Line Items]
Common shares		₩ 3,209,820	₩ 3,209,820
Owned by government
Common shares [Line Items]
Common shares	[1]	1,640,385	1,640,385
Owned by others
Common shares [Line Items]
Common shares		₩ 1,569,435	₩ 1,569,435
[1]	Korea Development Bank's interest of W1,056,176 million is included.

Details in number of outstandin

Details in number of outstanding capital stock (Details) - ₩ / shares	Dec. 31, 2019	Dec. 31, 2018
Disclosure of classes of share capital [Abstract]
Shares authorized	1,200,000,000	1,200,000,000
Shares issued	641,964,077	641,964,077
Par value per share	₩ 5,000	₩ 5,000

Details of share premium (Detai

Details of share premium (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2019	Dec. 31, 2018
Share premium [Abstract]
Share premium	₩ 843,758	₩ 843,758

Retained Earnings (Details)

Retained Earnings (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Retained Earnings Note Disclosure [Abstract]
Legal reserves	[1]	₩ 1,604,910	₩ 1,604,910
Voluntary reserves
Reserve for investment on social overhead capital		5,277,449	5,277,449
Reserve for research and human development	[2]	330,000	330,000
Reserve for business expansion		28,967,976	30,088,818
Reserve for equalizing dividends		210,000	210,000
Voluntary reserves		34,785,425	35,906,267
Retained earnings before appropriations		12,811,798	14,007,942
Retained earnings		₩ 49,202,133	₩ 51,519,119	₩ 53,370,558
[1]	The KEPCO Act requires KEPCO to appropriate a legal reserve equal to at least 20 percent of net income for each accounting period until the reserve equals 50 percent of KEPCO's common stock. The legal reserve is not available for cash dividends; however, this reserve may be credited to paid-in capital or offset against accumulated deficit by the resolution of the shareholders.
[2]	The reserve for research and human development is appropriated by KEPCO to use as qualified tax credits to reduce corporate tax liabilities. The reserve is available for cash dividends for a certain period as defined by the Restriction of Special Taxation Act of Korea.

Changes in retained earnings (D

Changes in retained earnings (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of Changes in retained earnings [Abstract]
Beginning balance	₩ 51,519,119	₩ 53,370,558
Effect of change in accounting policy	0	71,928
Net profit (loss) for the period attributed to owner of the Company	(2,345,517)	(1,314,567)	₩ 1,298,720
Changes in equity method retained earnings
Beginning balance	3,969	5,122
Ending balance	(2,820)	3,969	5,122
Changes	(6,789)	(1,153)
Remeasurements of defined benefit liability, net of tax	36,160	(100,495)
Transfer of gain (loss) on valuation of financial assets through other comprehensive income	(840)	0
Dividend paid	0	(507,152)	(1,271,089)
Ending balance	₩ 49,202,133	₩ 51,519,119	₩ 53,370,558

Dividends Paid (Details)

Dividends Paid (Details) - KRW (₩) ₩ / shares in Units, ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Dividends [Abstract]
Number of shares issued	641,964,077	641,964,077	641,964,077
Treasury Stock, Common, Shares	0	0	0
Number of shares eligible for dividends	641,964,077	641,964,077	641,964,077
Dividends paid per share (In won)	₩ 0	₩ 790	₩ 1,980
Dividend paid	₩ 0	₩ 507,152	₩ 1,271,089

Changes in Reserve of remeasure

Changes in Reserve of remeasurements (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of Changes in Reserve of remeasurements [Abstract]
Beginning balance	₩ (219,381)	₩ (43,513)
Changes	76,395	(154,198)
Income tax effect	(40,235)	53,703	₩ (80,645)
Transfer to reserve for business expansion	65,442	(75,373)
Ending balance	₩ (117,779)	₩ (219,381)	₩ (43,513)

Statement of Appropriation of_3

Statement of Appropriation of retained earnings (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Statement of Appropriation of Retained Earnings [Abstract]
Unappropriated retained earnings carried over from prior years	₩ 0	₩ 0
Effect of change in accounting policy	0	39,813
Net income (loss)	(2,594,957)	(1,095,213)
Remeasurements of defined benefit plans	(11,402)	(65,442)
Retained earnings before appropriations	(2,606,359)	(1,120,842)
Transfer from voluntary reserves	2,606,359	1,120,842
Subtotal (I+II)	0	0
Appropriations of retained earnings	₩ 0	0
Unappropriated retained earnings to be carried over to subsequent year		₩ 0

Hybrid bond (Details)

Hybrid bond (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Hybrid bond [Line Items]
Amount	₩ 398,910	₩ 398,910
Korea South-East Power | 1st bond-type hybrid bond
Hybrid bond [Line Items]
Issue date	Dec. 7, 2012	Dec. 7, 2012
Maturity date	Dec. 6, 2042	Dec. 6, 2042
Yield (%)	4.38%	4.38%
Amount	₩ 170,000	₩ 170,000
Korea South-East Power | 2nd bond-type hybrid bond
Hybrid bond [Line Items]
Issue date	Dec. 7, 2012	Dec. 7, 2012
Maturity date	Dec. 6, 2042	Dec. 6, 2042
Yield (%)	4.44%	4.44%
Amount	₩ 230,000	₩ 230,000
Expense of issuance
Hybrid bond [Line Items]
Amount	₩ (1,090)	₩ (1,090)

Other Components Of Equity (Det

Other Components Of Equity (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Changes In Other Components Of Equity [Line Items]
Beginning balance	₩ 14,171,228	₩ 14,257,309
Issuance of share capital of subsidiary	0	1,032
Others	(8,461)	0
Effect of change in accounting policy	0	(76,851)
Changes in the unrealized fair value of financial assets at FVOCI, net of tax	(10,891)	(34,125)
Shares in other comprehensive loss of associates and joint ventures, net of tax	19,343	57,089
Foreign currency translation of foreign operations, net of tax	55,347	(32,086)
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax	14,041	(1,140)
Ending balance	14,240,607	14,171,228
Other capital surplus
Changes In Other Components Of Equity [Line Items]
Beginning balance	1,234,825	1,233,793
Issuance of share capital of subsidiary		1,032
Others	(8,461)	0
Ending balance	1,226,364	1,234,825
Gains on disposal of Treasury stocks
Changes In Other Components Of Equity [Line Items]
Beginning balance	387,524	387,524
Issuance of share capital of subsidiary	0	0
Others	0	0
Ending balance	387,524	387,524
Other Capital Surplus Other Than Gainson Disposal Of Treasury Stocks
Changes In Other Components Of Equity [Line Items]
Beginning balance	847,301	846,269
Issuance of share capital of subsidiary		1,032
Others	(8,461)	0
Ending balance	838,840	847,301
Accumulated other comprehensive loss
Changes In Other Components Of Equity [Line Items]
Beginning balance	(358,570)	(271,457)
Effect of change in accounting policy		(76,851)
Changes in the unrealized fair value of financial assets at FVOCI, net of tax	(10,891)	(34,125)
Shares in other comprehensive loss of associates and joint ventures, net of tax	19,343	57,089
Foreign currency translation of foreign operations, net of tax	55,347	(32,086)
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax	14,041	(1,140)
Ending balance	(280,730)	(358,570)
Financial assets at fair value through other comprehensive income
Changes In Other Components Of Equity [Line Items]
Beginning balance	(81,708)	29,268
Effect of change in accounting policy		(76,851)
Changes in the unrealized fair value of financial assets at FVOCI, net of tax	(10,891)	(34,125)
Shares in other comprehensive loss of associates and joint ventures, net of tax		0
Foreign currency translation of foreign operations, net of tax		0
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax		0
Ending balance	(92,599)	(81,708)
Shares in other comprehensive Income (loss) of investments in associates and joint ventures
Changes In Other Components Of Equity [Line Items]
Beginning balance	123,553	66,464
Shares in other comprehensive loss of associates and joint ventures, net of tax	19,343	57,089
Ending balance	142,896	123,553
Reserve for overseas operations translation credit
Changes In Other Components Of Equity [Line Items]
Beginning balance	(350,245)	(318,159)
Foreign currency translation of foreign operations, net of tax	55,347	(32,086)
Ending balance	(294,898)	(350,245)
Reserve for gain (loss) on valuation of derivatives
Changes In Other Components Of Equity [Line Items]
Beginning balance	(50,170)	(49,030)
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax	14,041	(1,140)
Ending balance	(36,129)	(50,170)
Other equity
Changes In Other Components Of Equity [Line Items]
Beginning balance	13,294,973	13,294,973
Ending balance	13,294,973	13,294,973
Statutory revaluation reserve
Changes In Other Components Of Equity [Line Items]
Beginning balance	13,295,098	13,295,098
Ending balance	13,295,098	13,295,098
Changes in other equity
Changes In Other Components Of Equity [Line Items]
Beginning balance	(125)	(125)
Ending balance	₩ (125)	₩ (125)

Timing of revenue recognition (

Timing of revenue recognition (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of performance obligations [Line Items]
Total revenue from external customers		₩ 58,568,082	₩ 60,033,062	₩ 59,335,889
Domestic
Disclosure of performance obligations [Line Items]
Total revenue from external customers		56,942,128	57,799,991	55,652,807
Domestic | Performance obligations satisfied at point in time
Disclosure of performance obligations [Line Items]
Total revenue from external customers		56,609,330	57,514,866	55,373,316
Domestic | Performance obligations satisfied over time
Disclosure of performance obligations [Line Items]
Total revenue from external customers		332,798	285,125	279,491
Overseas
Disclosure of performance obligations [Line Items]
Total revenue from external customers	[1]	1,625,954	2,233,071	3,683,082
Overseas | Performance obligations satisfied at point in time
Disclosure of performance obligations [Line Items]
Total revenue from external customers		285,546	382,938	399,232
Overseas | Performance obligations satisfied over time
Disclosure of performance obligations [Line Items]
Total revenue from external customers		₩ 1,340,408	₩ 1,850,133	₩ 3,283,850
[1]	Middle East and other Asian countries make up the majority of overseas revenue and non-current assets. Since the overseas revenue or non-current assets attributable to particular countries are not material, they are not disclosed individually.

Selling and Administrative Ex_3

Selling and Administrative Expenses (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Expenses by nature [Line Items]
Raw materials used	₩ 17,084,029	₩ 19,537,928	₩ 15,924,707
Salaries	4,609,976	4,236,623	4,214,974
Retirement benefits expense	809,739	440,612	468,946
Welfare and benefit expense	563,945	596,572	723,144
Insurance expense	106,129	106,057	106,091
Depreciation	10,966,756	9,898,386	9,652,219
Amortization of intangible assets	156,915	118,938	113,672
Bad debt expense	(12,719)	39,784	126,714
Commission	1,011,710	1,189,284	1,143,435
Advertising expense	44,305	40,313	125,436
Training expense	24,077	20,373	21,389
Vehicle maintenance expense	17,177	17,957	17,466
Publishing expense	6,837	6,837	7,920
Business promotion expense	7,019	6,645	8,673
Rent expense	216,918	213,983	186,889
Telecommunication expense	19,485	106,073	98,872
Transportation expense	5,420	5,223	9,640
Taxes and dues	540,350	486,741	486,038
Expendable supplies expense	39,681	38,010	39,725
Water, light and heating expense	44,245	47,269	40,695
Repairs and maintenance expense	2,298,854	2,219,248	2,111,420
Ordinary development expense	735,715	723,888	721,437
Travel expense	84,233	81,427	85,673
Clothing expense	16,908	14,476	13,395
Survey and analysis expense	4,797	4,634	4,359
Membership fee	13,699	12,606	9,604
Power purchase	18,269,732	18,307,289	14,264,331
Disclosure - Other selling and administrative expenses
Accommodation development expenses	53,945	52,822	55,799
Miscellaneous wages	39,794	32,447	32,300
Litigation and filing expenses	21,768	12,853	11,881
Compensation for damages	(1,924)	19,193	12,297
Outsourcing expenses	3,293	3,036	2,647
Reward expenses	2,858	2,713	2,786
Overseas market development expenses	1,997	1,361	1,876
Others	28,775	23,772	35,123
Others	2,763,479	2,318,435	4,134,846
General and administrative expenses	2,669,576	2,627,890	2,762,855
Cost of sales	57,779,835	58,207,721	52,098,855
Total expenses, by nature	60,449,411	60,835,611	54,861,710
Selling and administrative expense
Expenses by nature [Line Items]
Raw materials used	0	0	0
Salaries	775,204	757,819	735,383
Retirement benefits expense	157,272	65,107	71,094
Welfare and benefit expense	120,463	132,089	179,406
Insurance expense	12,427	12,181	15,414
Depreciation	232,510	214,499	190,245
Amortization of intangible assets	76,547	54,153	44,990
Bad debt expense	(12,719)	39,784	126,714
Commission	632,849	714,096	673,740
Advertising expense	34,453	30,894	114,519
Training expense	7,174	6,277	7,027
Vehicle maintenance expense	9,525	10,148	9,998
Publishing expense	3,414	3,307	3,672
Business promotion expense	3,038	2,785	3,700
Rent expense	40,505	42,851	38,380
Telecommunication expense	8,451	23,505	24,916
Transportation expense	865	686	495
Taxes and dues	58,666	46,424	48,395
Expendable supplies expense	6,682	6,166	7,731
Water, light and heating expense	11,867	12,629	10,545
Repairs and maintenance expense	88,576	62,580	63,477
Ordinary development expense	224,463	215,494	211,417
Travel expense	15,652	14,363	16,658
Clothing expense	9,369	10,108	8,410
Survey and analysis expense	848	705	698
Membership fee	969	1,043	1,122
Power purchase	0	0	0
Disclosure - Other selling and administrative expenses
Accommodation development expenses	53,945	52,822	55,799
Miscellaneous wages	39,794	32,447	32,300
Litigation and filing expenses	21,768	12,853	11,881
Compensation for damages	(1,924)	19,193	12,297
Outsourcing expenses	3,293	3,036	2,647
Reward expenses	2,858	2,713	2,786
Overseas market development expenses	1,997	1,361	1,876
Others	28,775	23,772	35,123
Others	150,506	148,197	154,709
General and administrative expenses	2,669,576	2,627,890	2,762,855
Total expenses, by nature	₩ 2,669,576	₩ 2,627,890	₩ 2,762,855

Other Income and Expense (Detai

Other Income and Expense (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other non-operating income [Abstract]
Reversal of other provisions	₩ 16,542	₩ 12,700	₩ 35,265
Reversal of allowance for doubtful accounts	0	143	2,166
Gains on government grants	281	482	430
Gains on assets contributed	6,921	17,336	4,218
Gains on liabilities exempted	916	10,303	3,166
Compensation and reparations revenue	113,292	89,901	89,196
Revenue from research contracts	5,276	6,818	12,580
Income related to transfer of assets from customers	604,808	594,548	478,973
Rental income	191,088	186,631	192,136
Others of Other Income	58,849	51,032	50,988
Refund of claim for rectification	1,969	8,933	9,655
Adjustment of research project	3,294	2,267	3,884
Maintenance expenses on lease building	153	176	135
Training expenses	3,167	3,220	3,045
Deposit redemption	436	7	34
Reversal of expenses on litigation	9,926	753	360
Revenue on royalty fee	0	6,909	2,888
Reimbursement of insurance fee	610	7,145	1,498
Gains on guarantee contracts	135	39	456
Miscellaneous other non-operating income	39,159	21,583	29,033
Other non-operating income	997,973	969,894	869,118
Other non-operating expense
Compensation and indemnification expense	403	23,437	37
Accretion expenses of other provisions	7,939	41,924	7,535
Depreciation expenses on investment properties	5,069	923	1,176
Depreciation expenses on idle assets	6,542	6,547	6,644
Other bad debt expense	29,348	17,827	1,778
Donations	64,752	63,743	119,421
Others of Other Expense	127,860	76,929	43,464
Operating expenses related to the idle assets	49	47	136
Research grants	399	461	1,180
Supporting expenses on farming and fishing village	13,991	13,537	11,956
Operating expenses on fitness center	5,234	4,788	3,498
Expenses on adjustment of research and development grants	554	404	806
Taxes and dues	188	199	2,270
Expenses on R&D supporting	67	53	5,459
Miscellaneous other non-operating expense	107,378	57,440	18,159
Other non-operating expense	₩ 241,913	₩ 231,330	₩ 180,055

Other Gains (Losses) (Details)

Other Gains (Losses) (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Other gains
Gains on disposal of property, plant and equipment	₩ 43,784		₩ 98,077		₩ 48,316
Gains on disposal of intangible assets	206		12		564
Reversal of impairment loss on property, plant and equipment	16,692
Reversal of impairment loss on intangible assets	0		17		54
Gains on foreign currency translation	16,340		14,905		20,485
Gains on foreign currency transaction	53,152		47,297		93,151
Gains on insurance proceeds	17,410		0		400
Miscellaneous Other Gains	238,688		221,556		269,562
Gains on disposal of inventories	3,424		6,350		6,024
Gains on proxy collection of TV license fee	41,013		40,450		39,711
Gains on compensation of impaired electric poles	1,372		1,166		1,526
Gains on compensation for infringement on contract	0		3,648		18,990
Gains on harbor facilities dues	3,741		3,803		3,025
Gains on technical fees	3,044		2,026		2,105
Reversal of occupation development training fees	1,472		1,602		1,697
Gains on disposal of waste	5,317		4,232		4,261
Gains on insurance	812		22,382		10,410
Gains on tax rebate	341		542		2,161
Gains on other commission	1,111		4,347		4,790
Gains on disposal of assets held-for-sale	23,778
Others of Miscellaneous Other Gains	153,263		131,008		174,862
Other losses
Losses on disposal of property, plant and equipment	(72,508)		(60,704)		(70,514)
Losses on disposal of intangible assets	(827)		(43)		(183)
Impairment loss on property, plant and equipment	(50,036)	[1],[2]	(710,164)	[3]	(51,067)
Impairment loss on intangible assets	(513,609)		(8,112)		(20)
Impairment loss on other non-current assets	(49,620)		(87,024)
Losses on foreign currency translation	(8,757)		(7,678)		(25,495)
Losses on foreign currency transaction	(55,283)		(65,366)		(36,241)
Miscellaneous Other Losses	(217,892)		(63,899)		(92,385)
Losses on valuation of inventories	3,127		1,953		3,875
Losses on disposal of inventories	10,456		3,555		3,273
Losses due to disaster	7,635		2,129		5,374
Losses on rounding adjustment of electric charge surtax	1,268		1,265		1,253
Losses on adjustments of levies	0		0		1
Forfeit of taxes and dues	0		0		656
Others Of Miscellaneous Other Losses	195,406		54,997		77,953
Net other gains	₩ (582,258)		₩ (621,124)		₩ 156,627
[1]	As described in Note 2, the Company recognized impairment loss of KRW3,819 million related to Wolsong unit 1, Shin-Hanul unit 3 and 4 and reversal of impairment loss of KRW16,693 million related to Wolsong unit 1.
[2]	KEPCO Bylong Australia Pty., Ltd., 100% owned subsidiary, performed an impairment test over its land and others. The Company recognized the amount of the carrying amount in excess of its recoverable amount as an impairment loss.
[3]	Korea Hydro & Nuclear Power Co., Ltd. And Korea Western Power Co., Ltd., 100% owned subsidiaries, have determined that there are impairment indicators for the shutdowns of certain power generation units and fire, and performed an impairment test over the individual assets. As a result, the Company recognized the amount of the carrying amount in excess of its recoverable amount as an impairment loss in the consolidated statements of comprehensive income.

Finance Income (Details)

Finance Income (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest Income
Cash and cash equivalents	₩ 42,861	₩ 40,704	₩ 35,474
Available-for-sale financial assets	0	0	290
Financial assets at fair value through profit or loss	29,411	21,713	0
Financial assets at amortized cost	539	89	0
Held-to-maturity investments	0	0	82
Loans	63,448	21,925	30,014
Short-term financial instrument	49,070	41,025	29,412
Long-term financial instrument	12,794	7,920	8,144
Other financial assets	54	1	0
Trade and other receivables	69,941	90,390	102,727
Total Interest Income	268,118	223,767	206,143
Dividends income	13,838	12,777	11,477
Gains on disposal of financial assets	3,866	1,838	1,130
Gains on valuation of financial assets at fair value through profit or loss	5,575	8,495	12
Gains on valuation of derivatives	362,735	199,943	16,165
Gains on transaction of derivatives	157,961	179,745	29,257
Gains on foreign currency translation of Finance Income	175,839	143,254	1,115,832
Gains on foreign currency transaction	21,774	27,051	150,602
Total Finance Income	₩ 1,009,706	₩ 796,870	₩ 1,530,618

Finance Expenses (Details)

Finance Expenses (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest Expense
Trade and other payables	₩ 94,019	₩ 42,830	₩ 57,160
Short-term borrowings	42,971	32,545	35,891
Long-term borrowings	119,806	92,243	87,011
Debt securities	1,827,511	1,771,544	1,698,232
Other financial liabilities	558,464	505,112	491,665
Interest Expense (Before Capitalizing borrowing costs)	2,642,771	2,444,274	2,369,959
Less: Capitalized borrowing costs	(595,960)	(575,816)	(580,407)
Interest expense	2,046,811	1,868,458	1,789,552
Losses on sale of financial assets	2,106	1	2,343
Losses on valuation of financial assets at fair value through profit or loss	4,513	6,616	0
Impairment of available-for-sale financial assets	0	0	2,713
Losses on valuation of derivatives	45,385	46,740	890,832
Losses on transaction of derivatives	71,546	32,448	198,218
Losses on foreign currency translation	553,731	393,859	207,944
Losses on foreign currency transaction	55,509	121,763	35,175
Losses on repayment of financial liabilities	0	0	5
Other Finance Expenses	2,555	858	1,170
Total Finance Expense	₩ 2,782,156	₩ 2,470,743	₩ 3,127,952

Income tax expense (benefit) (D

Income tax expense (benefit) (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income tax expense (benefit) [Abstract]
Current income tax expense	₩ 308,480	₩ 286,375	₩ 829,969
Payment of income tax	538,223	378,715	881,583
Adjustment in respect of prior years due to change in estimate	(176,440)	(195,648)	4,484
Current income tax directly recognized in equity	(53,302)	101,528	(56,098)
Income tax directly adjusted to shareholders' equity (except for accumulated other comprehensive income (loss))	3,432	4,273	5,223
Dividends of hybrid bond	3,432	4,273	5,248
Effect of change in effective tax rate	0	0	(25)
Income tax recognized as other comprehensive income (loss)	(56,733)	97,255	(61,321)
Gain(loss) on valuation of financial assets at fair value through other comprehensive income	(4,217)	35,798	0
Loss on valuation of available-for-sale financial assets	0	0	(2,551)
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax	(15,642)	6,639	(11,016)
Remeasurements of defined benefit obligations	(40,235)	53,703	(80,645)
Investments in associates	4,275	6,592	8,649
Others	(914)	(5,477)	24,242
Effect of change in accounting policy	0	1,780	0
Deferred income tax expense (benefit)	(1,310,783)	(1,112,696)	1,342,855
Generation and realization of temporary differences	(636,984)	(495,658)	1,283,012
Changes of unrecognized tax losses, tax credit and temporary differences for prior periods	(22,469)	(28,509)	44,573
Changes in deferred tax on tax losses carryforwards	(582,011)	(572,305)	0
Tax credit carryforwards	(71,306)	(16,224)	15,270
Amount due to change in tax rate or regulations	1,987	0	0
Income tax expense (benefit)	₩ (1,002,303)	₩ (826,321)	₩ 2,172,824

Income tax expense _ Reconcilia

Income tax expense : Reconciliation between actual income tax expense and amount computed by applying the statutory tax rate to income before income taxes (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure - Income tax expense calculated by multiplying net income before tax with the tax rate [Abstract]
Profit (loss) before income tax		₩ (3,265,838)	₩ (2,000,819)	₩ 3,614,218
Income tax expense (benefit) computed at applicable tax rate	[1]	(898,105)	(550,225)	874,641
Adjustments		72,243	(80,448)	1,293,699
Effect of applying gradual tax rate		10,362	(1,408)	(5,082)
Effect of non-taxable income		(9,990)	(1,705)	(32,032)
Effect of non-deductible expenses		12,197	40,151	15,032
Effect of tax losses that are not recognized as deferred tax asset		57,490	2,086	0
Effects of tax credits and deduction		(76,983)	(39,471)	(161,069)
Recognition (reversal) of unrecognized deferred tax asset, net		(22,469)	(28,509)	44,573
Effect of change in deferred tax due to change in tax rate		16,848	261	1,055,154
Deferred income tax related to investments in subsidiaries and associates		147,598	(52,618)	394,145
Others, net		(62,810)	765	(17,022)
Adjustment in respect of prior years due to change in estimate		(176,440)	(195,648)	4,484
Income tax expense (benefit)		₩ (1,002,303)	₩ (826,321)	₩ 2,172,824
Effective tax rate				60.00%
[1]	Applicable tax rate is 24.2% as of December 31, 2017, and 27.5% as of December 31, 2018 and 2019.

Deferred tax expenses by origin

Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2019		Dec. 31, 2018	Dec. 31, 2017
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance		₩ (8,383,548)		₩ (9,496,244)	₩ (8,153,389)
Amounts recognized in profit or loss		1,351,632		1,011,168	(1,286,757)
Amount recognized in other comprehensive income (loss)		(56,733)		97,255	(61,321)
Amounts recognized directly in equity		3,432		4,273	5,223
Others	[1]	(41,729)
Ending balance		(7,126,946)		(8,383,548)	(9,496,244)
Deferred income tax on temporary differences
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance		(8,992,509)		(9,516,675)	(8,189,092)
Amounts recognized in profit or loss		704,559		422,638	(1,271,485)
Amount recognized in other comprehensive income (loss)		(56,733)		97,255	(61,321)
Amounts recognized directly in equity		3,432		4,273	5,223
Others	[1]	(41,729)
Ending balance		(8,382,980)		(8,992,509)	(9,516,675)
Employee benefits
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance		594,541		498,694	493,331
Amounts recognized in profit or loss		94,541		42,144	86,008
Amount recognized in other comprehensive income (loss)		(40,235)		53,703	(80,645)
Amounts recognized directly in equity		0		0	0
Others	[1]	0
Ending balance		648,847		594,541	498,694
Cash flow hedges
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance		39,461		65,445	(53,583)
Amounts recognized in profit or loss		(23,977)		(32,623)	130,044
Amount recognized in other comprehensive income (loss)		(15,642)		6,639	(11,016)
Amounts recognized directly in equity		(841)		0	0
Others		0
Ending balance		(999)		39,461	65,445
Investments in associates or subsidiaries
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance		(8,666,871)		(8,668,016)	(7,166,345)
Amounts recognized in profit or loss		(3,131)		(5,447)	(1,510,295)
Amount recognized in other comprehensive income (loss)		4,275		6,592	8,649
Amounts recognized directly in equity		0		0	(25)
Others	[1]	0
Ending balance		(8,665,727)		(8,666,871)	(8,668,016)
Property, Plant and Equipment
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance		(6,522,778)		(6,860,440)	(5,527,318)
Amounts recognized in profit or loss		(592,440)		337,662	(1,333,122)
Amount recognized in other comprehensive income (loss)		0		0	0
Amounts recognized directly in equity		0		0	0
Others	[1]	0
Ending balance		(7,115,218)		(6,522,778)	(6,860,440)
Finance lease
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance		(453,074)		(426,949)	(345,431)
Amounts recognized in profit or loss		292,631		(26,125)	(81,518)
Amount recognized in other comprehensive income (loss)		0		0	0
Amounts recognized directly in equity		0		0	0
Others	[1]	0
Ending balance		(160,443)		(453,074)	(426,949)
Intangible Assets
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance		6,055		7,648	8,987
Amounts recognized in profit or loss		(20,232)		(1,593)	(1,339)
Amount recognized in other comprehensive income (loss)		0		0	0
Amounts recognized directly in equity		0		0	0
Others	[1]	(41,729)
Ending balance		(55,906)		6,055	7,648
Financial assets at fair value through profit or loss
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance		19		890	(62)
Amounts recognized in profit or loss		322		(871)	952
Amount recognized in other comprehensive income (loss)		0		0	0
Amounts recognized directly in equity		0		0	0
Others	[1]	0
Ending balance		341		19	890
Available-for-sale financial assets
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance		0		(8,843)	(68,347)
Amounts recognized in profit or loss		0		0	62,055
Amount recognized in other comprehensive income (loss)		0		0	(2,551)
Amounts recognized directly in equity		0		0	0
Ending balance		0		0	(8,843)
Financial assets at fair value through other comprehensive income
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance		25,576		0	0
Amounts recognized in profit or loss		(3,114)		(1,379)	0
Amount recognized in other comprehensive income (loss)		(4,217)		35,798	0
Amounts recognized directly in equity		0		0	0
Others	[1]	0
Ending balance		18,245		25,576	0
Deferred revenue
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance		219,742		230,711	213,859
Amounts recognized in profit or loss		(6,739)		(10,969)	16,852
Amount recognized in other comprehensive income (loss)		0		0	0
Amounts recognized directly in equity		0		0	0
Others	[1]	0
Ending balance		213,003		219,742	230,711
Provisions
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance		4,800,946		4,822,833	3,583,371
Amounts recognized in profit or loss		655,973		(21,887)	1,239,462
Amount recognized in other comprehensive income (loss)		0		0	0
Amounts recognized directly in equity		0		0	0
Others	[1]	0
Ending balance		5,456,919		4,800,946	4,822,833
Doubtful receivables
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance		59		59	2,696
Amounts recognized in profit or loss		0		0	(2,637)
Amount recognized in other comprehensive income (loss)		0		0	0
Amounts recognized directly in equity		0		0	0
Others	[1]	0
Ending balance		59		59	59
Other finance liabilities
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance		39,493		32,755	30,249
Amounts recognized in profit or loss		(4,402)		2,465	(2,742)
Amount recognized in other comprehensive income (loss)		0		0	0
Amounts recognized directly in equity		4,273		4,273	5,248
Others	[1]	0
Ending balance		39,364		39,493	32,755
Gains or losses on foreign exchange translation
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance		27,080		(1,354)	138,938
Amounts recognized in profit or loss		30,881		28,434	(140,292)
Amount recognized in other comprehensive income (loss)		0		0	0
Amounts recognized directly in equity		0		0	0
Others	[1]	0
Ending balance		57,961		27,080	(1,354)
Allowance for doubtful accounts
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance		58,756		42,931	17,252
Amounts recognized in profit or loss		(1,149)		15,825	25,679
Amount recognized in other comprehensive income (loss)		0		0	0
Amounts recognized directly in equity		0		0	0
Others	[1]	0
Ending balance		57,607		58,756	42,931
Accrued income
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance		(2,914)		(1,825)	(5,367)
Amounts recognized in profit or loss		(1,462)		(1,089)	3,542
Amount recognized in other comprehensive income (loss)		0		0	0
Amounts recognized directly in equity		0		0	0
Others	[1]	0
Ending balance		(4,376)		(2,914)	(1,825)
Special deduction for property, plant and equipment
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance		(211,746)		(200,927)	(194,309)
Amounts recognized in profit or loss		(3,627)		(10,819)	(6,618)
Amount recognized in other comprehensive income (loss)		0		0	0
Amounts recognized directly in equity		0		0	0
Others	[1]	0
Ending balance		(215,373)		(211,746)	(200,927)
Reserve for research and human development
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance		0		(3,041)	(12,883)
Amounts recognized in profit or loss				3,041	9,842
Amount recognized in other comprehensive income (loss)				0	0
Amounts recognized directly in equity				0	0
Ending balance				0	(3,041)
Others
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance		1,053,146		952,754	695,870
Amounts recognized in profit or loss		290,484		105,869	232,642
Amount recognized in other comprehensive income (loss)		(914)		(5,477)	24,242
Amounts recognized directly in equity		0		0	0
Others	[1]	0
Ending balance		1,342,716		1,053,146	952,754
Deferred income tax on unused tax losses and tax credit
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance		608,961		20,431	35,703
Amounts recognized in profit or loss		647,073		588,530	(15,272)
Amount recognized in other comprehensive income (loss)		0		0	0
Amounts recognized directly in equity		0		0	0
Others	[1]	0
Ending balance		1,256,034		608,961	20,431
Unused tax losses
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance		554,457		36,695	17,848
Amounts recognized in profit or loss		557,356		554,457	18,847
Amount recognized in other comprehensive income (loss)		0		0	0
Amounts recognized directly in equity		0		0	0
Others		0	[1]		0
Ending balance		1,111,813		554,457	36,695
Excess of donation limit
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance		17,848		0	0
Amounts recognized in profit or loss		18,847		17,848	0
Amount recognized in other comprehensive income (loss)		0		0	0
Amounts recognized directly in equity		0		0	0
Ending balance		36,695		17,848	0
Tax credit
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance		36,656		20,431	35,703
Amounts recognized in profit or loss		70,870		16,225	(15,272)
Amount recognized in other comprehensive income (loss)		0		0	0
Amounts recognized directly in equity		0		0	0
Others	[1]	0
Ending balance		₩ 107,526		₩ 36,656	₩ 20,431
[1]	'Others' include amount changed due to business combination. (see Note 51)

Deferred tax assets and liabili

Deferred tax assets and liabilities presented on a gross basis prior to any offsetting (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure - Deferred tax assets and liabilities presented on a gross basis prior to any offsetting [Abstract]
Deferred tax assets	₩ 1,437,829	₩ 1,233,761
Deferred tax liabilities	(8,564,775)	(9,617,309)
Net Deferred tax assets(liabilities)	₩ (7,126,946)	₩ (8,383,548)	₩ (9,496,244)	₩ (8,153,389)

Details of deductible temporary

Details of deductible temporary differences, tax losses and unused tax credits not recognized in the deferred income tax assets (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2019	Dec. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [Abstract]
Deductible temporary differences	₩ 541,449	₩ 442,391

Assets Held-for-Sale (Details)

Assets Held-for-Sale (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2019	Dec. 31, 2018
Assets Held-for-Sale [Abstract]
Land	[1]	₩ 23,002	₩ 2,765
Building	[1]	193	19,369
Investments	[2],[3],[4]	4,921	747
Assets Held-for-Sale		₩ 28,116	₩ 22,881
[1]	The board of directors of KEPCO Engineering & Construction Company, Inc., a subsidiary of the Company, determined to dispose the premises in Yongin as part of the government's plan to relocate state-run companies for balanced national development and moved the head office to Gimcheon, Gyeongsangbukdo, in August 2015. As the Company believes the book value of Yongin premises will be recovered by a disposal transaction rather than continuous operation, its reclassified buildings, land and structures as assets held-for-sale. However, since the sale price of the premises has been expected to rise in accordance with the development plan in Yongin, Gyeonggi Province, the Company has not actively carried out the procedure for the sale since May 2019. For this reason, the premises no longer satisfy the definition of assets held-for-sale by KIFRS 1105, due to the period required to complete the sale is expected to be more than one year under the circumstances that can be controlled by the Company. Accordingly, the Company reclassified the premises as investment properties.
[2]	As of December 31, 2018, the Company reclassified investment of its subsidiary, KOWEPO India Private Limited, as assets held-for-sale due to the decision to liquidate the company. The liquidation process was completed during the year ended December 31, 2019.
[3]	Garolim Tidal Power Plant Co., Ltd. was in the process of liquidating its business as of December 31, 2019 and has been reclassified to assets held-for-sale, accordingly.
[4]	Ulleungdo Natural Energy Co., Ltd. was in the process of liquidating its business as of December 31, 2019 and has been reclassified to assets held-for-sale, accordingly.

Expenses by nature (Details)

Expenses by nature (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Expenses by nature [Line Items]
Raw materials used	₩ 17,084,029	₩ 19,537,928	₩ 15,924,707
Salaries	4,609,976	4,236,623	4,214,974
Retirement benefits expense	809,739	440,612	468,946
Welfare and benefit expense	563,945	596,572	723,144
Insurance expense	106,129	106,057	106,091
Depreciation	10,966,756	9,898,386	9,652,219
Amortization of intangible assets	156,915	118,938	113,672
Bad debt expense	(12,719)	39,784	126,714
Commission	1,011,710	1,189,284	1,143,435
Advertising expense	44,305	40,313	125,436
Training expense	24,077	20,373	21,389
Vehicle maintenance expense	17,177	17,957	17,466
Publishing expense	6,837	6,837	7,920
Business promotion expense	7,019	6,645	8,673
Rental expense	216,918	213,983	186,889
Telecommunication expense	19,485	106,073	98,872
Transportation expense	5,420	5,223	9,640
Taxes and dues	540,350	486,741	486,038
Expendable supplies expense	39,681	38,010	39,725
Water, light and heating expense	44,245	47,269	40,695
Repairs and maintenance expense	2,298,854	2,219,248	2,111,420
Ordinary development expense	735,715	723,888	721,437
Travel expense	84,233	81,427	85,673
Clothing expense	16,908	14,476	13,395
Survey and analysis expense	4,797	4,634	4,359
Membership fee	13,699	12,606	9,604
Power purchase	18,269,732	18,307,289	14,264,331
Disclosure - Other selling and administrative expenses
Accommodation development expenses	53,945	52,822	55,799
Miscellaneous wages	39,794	32,447	32,300
Litigation and filing expenses	21,768	12,853	11,881
Compensation for damages	(1,924)	19,193	12,297
Outsourcing expenses	3,293	3,036	2,647
Reward expenses	2,858	2,713	2,786
Overseas market development expenses	1,997	1,361	1,876
Others	28,775	23,772	35,123
Others	2,763,479	2,318,435	4,134,846
General and administrative expenses	2,669,576	2,627,890	2,762,855
Cost of sales	57,779,835	58,207,721	52,098,855
Total expenses, by nature	60,449,411	60,835,611	54,861,710
Selling and administrative expense
Expenses by nature [Line Items]
Raw materials used	0	0	0
Salaries	775,204	757,819	735,383
Retirement benefits expense	157,272	65,107	71,094
Welfare and benefit expense	120,463	132,089	179,406
Insurance expense	12,427	12,181	15,414
Depreciation	232,510	214,499	190,245
Amortization of intangible assets	76,547	54,153	44,990
Bad debt expense	(12,719)	39,784	126,714
Commission	632,849	714,096	673,740
Advertising expense	34,453	30,894	114,519
Training expense	7,174	6,277	7,027
Vehicle maintenance expense	9,525	10,148	9,998
Publishing expense	3,414	3,307	3,672
Business promotion expense	3,038	2,785	3,700
Rental expense	40,505	42,851	38,380
Telecommunication expense	8,451	23,505	24,916
Transportation expense	865	686	495
Taxes and dues	58,666	46,424	48,395
Expendable supplies expense	6,682	6,166	7,731
Water, light and heating expense	11,867	12,629	10,545
Repairs and maintenance expense	88,576	62,580	63,477
Ordinary development expense	224,463	215,494	211,417
Travel expense	15,652	14,363	16,658
Clothing expense	9,369	10,108	8,410
Survey and analysis expense	848	705	698
Membership fee	969	1,043	1,122
Power purchase	0	0	0
Disclosure - Other selling and administrative expenses
Accommodation development expenses	53,945	52,822	55,799
Miscellaneous wages	39,794	32,447	32,300
Litigation and filing expenses	21,768	12,853	11,881
Compensation for damages	(1,924)	19,193	12,297
Outsourcing expenses	3,293	3,036	2,647
Reward expenses	2,858	2,713	2,786
Overseas market development expenses	1,997	1,361	1,876
Others	28,775	23,772	35,123
Others	150,506	148,197	154,709
General and administrative expenses	2,669,576	2,627,890	2,762,855
Total expenses, by nature	2,669,576	2,627,890	2,762,855
Cost of sales
Expenses by nature [Line Items]
Raw materials used	17,084,029	19,537,928	15,924,707
Salaries	3,834,772	3,478,804	3,479,591
Retirement benefits expense	652,467	375,505	397,852
Welfare and benefit expense	443,482	464,483	543,738
Insurance expense	93,702	93,876	90,677
Depreciation	10,734,246	9,683,887	9,461,974
Amortization of intangible assets	80,368	64,785	68,682
Bad debt expense	0	0	0
Commission	378,861	475,188	469,695
Advertising expense	9,852	9,419	10,917
Training expense	16,903	14,096	14,362
Vehicle maintenance expense	7,652	7,809	7,468
Publishing expense	3,423	3,530	4,248
Business promotion expense	3,981	3,860	4,973
Rental expense	176,413	171,132	148,509
Telecommunication expense	11,034	82,568	73,956
Transportation expense	4,555	4,537	9,145
Taxes and dues	481,684	440,317	437,643
Expendable supplies expense	32,999	31,844	31,994
Water, light and heating expense	32,378	34,640	30,150
Repairs and maintenance expense	2,210,278	2,156,668	2,047,943
Ordinary development expense	511,252	508,394	510,020
Travel expense	68,581	67,064	69,015
Clothing expense	7,539	4,368	4,985
Survey and analysis expense	3,949	3,929	3,661
Membership fee	12,730	11,563	8,482
Power purchase	18,269,732	18,307,289	14,264,331
Disclosure - Other selling and administrative expenses
Others	2,612,973	2,170,238	3,980,137
Cost of sales	57,779,835	58,207,721	52,098,855
Total expenses, by nature	₩ 57,779,835	₩ 58,207,721	₩ 52,098,855

Basic earnings (loss) per share

Basic earnings (loss) per share (Details) - KRW (₩) ₩ / shares in Units, ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Basic earnings (loss) per share [Abstract]
Net Profit (loss) attributable to controlling interest	₩ (2,345,517)	₩ (1,314,567)	₩ 1,298,720
Profit (loss) used in the calculation of total basic earnings (loss) per share	₩ (2,345,517)	₩ (1,314,567)	₩ 1,298,720
Weighted average number of common shares	641,964,077	641,964,077	641,964,077
Basic earnings (loss) per share	₩ (3,654)	₩ (2,048)	₩ 2,023

Diluted earnings (loss) per sha

Diluted earnings (loss) per share (Details) - KRW (₩) ₩ / shares in Units, ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Diluted earnings (loss) per share [Abstract]
Profit (loss) used in the calculation of total diluted earnings (loss) per share	₩ (2,345,517)	₩ (1,314,567)	₩ 1,298,720
Weighted average number of common shares	641,964,077	641,964,077	641,964,077
Diluted weighted average number of shares	641,964,077	641,964,077	641,964,077
Diluted earnings (loss) per share	₩ (3,654)	₩ (2,048)	₩ 2,023

Capital risk management (Detail

Capital risk management (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of Capital risk management [Abstract]
Total borrowings and debt securities	₩ 67,876,541	₩ 61,034,627
Cash and cash equivalents	1,810,129	1,358,345	₩ 2,369,739	₩ 3,051,353
Net borrowings and debt securities	66,066,412	59,676,282
Total shareholders' equity	₩ 68,889,649	₩ 71,092,762	₩ 72,964,641	₩ 73,050,545
Debt to equity ratio	95.90%	83.94%

Maximum exposure to credit risk

Maximum exposure to credit risk (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2019	Dec. 31, 2018
Cash and Cash Equivalents
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk		₩ 1,810,129	₩ 1,358,345
Financial assets at fair value through profit or loss
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk		747,261	920,935
Not Designated as Hedging Instrument
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk		165,204	37,631
Financial assets at amortized cost
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk		13,609	14,042
Loans and receivables
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk		738,707	718,674
Long-term/short-term financial instruments
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk		1,960,227	2,318,027
Designated as Hedging Instrument
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk		145,829	64,704
Trade and other receivables
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk		9,703,749	9,613,437
Financial guarantee contracts
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk	[1]	₩ 3,338,566	₩ 1,310,817
[1]	Maximum exposure associated with the financial guarantee contracts is the maximum amounts of the obligation.

Sensitivity analysis for actuar

Sensitivity analysis for actuarial assumptions (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2019	Dec. 31, 2018
Actuarial assumption of expected rates of salary increases
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
1% Increase	₩ 442,748	₩ 416,956
1% Decrease	(386,147)	(363,820)
Actuarial assumption of discount rates
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
1% Increase	(402,099)	(377,221)
1% Decrease	₩ 475,765	₩ 445,833

Principal assumptions on provis

Principal assumptions on provisions valuation (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
PCBs
Disclosure of Principal assumptions on provisions valuation [Line Items]
Inflation rate	1.09%	1.27%
Discount rate	1.97%	2.18%
Nuclear plants
Disclosure of Principal assumptions on provisions valuation [Line Items]
Inflation rate	1.10%	1.21%
Discount rate	2.43%	2.94%
Spent fuel
Disclosure of Principal assumptions on provisions valuation [Line Items]
Inflation rate	2.93%	2.93%
Discount rate	4.49%	4.49%

Sensitivity analysis for provis

Sensitivity analysis for provisions assumptions (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
PCBs | Discount rate
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]
0.1% Increase	₩ (527)	₩ (623)
0.1% Decrease	530	627
PCBs | Inflation rate
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]
0.1% Increase	534	632
0.1% Decrease	(532)	(629)
Nuclear plants | Discount rate
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]
0.1% Increase	(316,184)	(256,513)
0.1% Decrease	325,828	263,595
Nuclear plants | Inflation rate
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]
0.1% Increase	346,082	294,984
0.1% Decrease	(336,182)	(287,110)
Spent fuel | Discount rate
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]
0.1% Increase	(51,607)	(49,182)
0.1% Decrease	53,621	51,098
Spent fuel | Inflation rate
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]
0.1% Increase	54,396	51,837
0.1% Decrease	₩ (52,424)	₩ (49,961)

Foreign currency risk (Details)

Foreign currency risk (Details) ₸ in Thousands, ₱ in Thousands, € in Thousands, ₫ in Thousands, ₨ in Thousands, ₨ in Thousands, ৳ in Thousands, ر.س in Thousands, د.إ in Thousands, ¥ in Thousands, ¥ in Thousands, £ in Thousands, kr in Thousands, kr in Thousands, SFr in Thousands, Rp in Thousands, R in Thousands, P in Thousands, Kč in Thousands, K in Thousands, JD in Thousands, GH₵ in Thousands, Ar in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands

Dec. 31, 2019USD ($)

Dec. 31, 2019JOD (JD)

Dec. 31, 2019EUR (€)

Dec. 31, 2019AUD ($)

Dec. 31, 2019CHF (SFr)

Dec. 31, 2019HKD ($)

Dec. 31, 2019SEK (kr)

Dec. 31, 2019PHP (₱)

Dec. 31, 2019SAR (ر.س)

Dec. 31, 2019JPY (¥)

Dec. 31, 2019INR (₨)

Dec. 31, 2019CAD ($)

Dec. 31, 2019ZAR (R)

Dec. 31, 2019AED (د.إ)

Dec. 31, 2019IDR (Rp)

Dec. 31, 2019PKR (₨)

Dec. 31, 2019BDT (৳)

Dec. 31, 2019BWP (P)

Dec. 31, 2019CNY (¥)

Dec. 31, 2019CZK (Kč)

Dec. 31, 2019GBP (£)

Dec. 31, 2019KZT (₸)

Dec. 31, 2019MGA (Ar)

Dec. 31, 2019MMK (K)

Dec. 31, 2019UYU ($)

Dec. 31, 2019VND (₫)

Dec. 31, 2018USD ($)

Dec. 31, 2018JOD (JD)

Dec. 31, 2018EUR (€)

Dec. 31, 2018AUD ($)

Dec. 31, 2018CHF (SFr)

Dec. 31, 2018HKD ($)

Dec. 31, 2018SEK (kr)

Dec. 31, 2018PHP (₱)

Dec. 31, 2018SAR (ر.س)

Dec. 31, 2018JPY (¥)

Dec. 31, 2018INR (₨)

Dec. 31, 2018CAD ($)

Dec. 31, 2018ZAR (R)

Dec. 31, 2018AED (د.إ)

Dec. 31, 2018IDR (Rp)

Dec. 31, 2018PKR (₨)

Dec. 31, 2018BDT (৳)

Dec. 31, 2018BWP (P)

Dec. 31, 2018CNY (¥)

Dec. 31, 2018GBP (£)

Dec. 31, 2018KZT (₸)

Dec. 31, 2018MGA (Ar)

Dec. 31, 2018MMK (K)

Dec. 31, 2018UYU ($)

Dec. 31, 2018NOK (kr)

Dec. 31, 2018GHS (GH₵)

Disclosure of Foreign currency risk [Abstract]

Assets

$ 1,227,054

JD 1,516

€ 208

$ 143

SFr 0

$ 0

kr 0

₱ 175,210

ر.س 2,653

¥ 109,970

₨ 1,244,170

$ 86

R 450

د.إ 57,403

Rp 376,136

₨ 354,361

৳ 85,547

P 1,437

¥ 0

Kč 0

£ 0

₸ 319

Ar 3,858,201

K 29,651

$ 58,781

₫ 418,998

$ 1,422,510

JD 2,764

€ 337

$ 143

SFr 0

$ 0

kr 0

₱ 709,285

ر.س 2,024

¥ 35,935

₨ 1,228,795

$ 96

R 170

د.إ 10,513

Rp 60,568

₨ 305,542

৳ 71,575

P 1,214

¥ 0

£ 0

₸ 319

Ar 3,318,447

K 25,208

$ 39,898

kr 0

GH₵ 25,794

Liabilities

$ 9,963,928

JD 147

€ 111,199

$ 1,036,785

SFr 500,753

$ 1,648,815

kr 449,072

₱ 130,073

ر.س 480

¥ 314,402

₨ 210,232

$ 3,112

R 6

د.إ 40,061

Rp 219,801

₨ 4,366

৳ 635

P 0

¥ 26,140

Kč 243

£ 191

₸ 0

Ar 133,403

K 0

$ 8,213

₫ 1,375

$ 8,103,602

JD 5

€ 105,673

$ 717,712

SFr 400,000

$ 1,650,000

kr 450,000

₱ 66,985

ر.س 0

¥ 390,921

₨ 183,963

$ 4

R 4

د.إ 5,890

Rp 206,935

₨ 3,588

৳ 1,175

P 0

¥ 26,140

£ 1

₸ 0

Ar 170,641

K 0

$ 4,253

kr 0

GH₵ 0

Sensitivity analysis for Foreig

Sensitivity analysis for Foreign currency exchange rates (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Increase (decrease) of income before income tax
Disclosure of Sensitivity analysis for Foreign currency exchange rates [Line Items]
10% Increase		₩ (1,197,530)	₩ (887,561)
10% Decrease		1,197,530	887,561
Increase (decrease) of shareholder's equity
Disclosure of Sensitivity analysis for Foreign currency exchange rates [Line Items]
10% Increase	[1]	(1,197,530)	(887,561)
10% Decrease	[1]	₩ 1,197,530	₩ 887,561
[1]	The effect on the shareholders' equity excluding the impact of income taxes.

Interest rate risk (Details)

Interest rate risk (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2019	Dec. 31, 2018
Disclosure of financial instruments by type of interest rate [Line Items]
Short-term borrowings	₩ 1,315,134	₩ 1,172,624
Long-term borrowings	3,389,743	3,258,015
Total	67,876,541	61,034,627
Floating interest rate [Member]
Disclosure of financial instruments by type of interest rate [Line Items]
Short-term borrowings	0	24,235
Long-term borrowings	2,273,579	2,358,860
Debt securities	243,102	0
Total	₩ 2,516,681	₩ 2,383,095

Sensitivity analysis for Intere

Sensitivity analysis for Interest rates (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Increase (decrease) of income before income tax
Disclosure of Sensitivity analysis for Interest rates [Line Items]
1% Increase		₩ (25,167)	₩ (23,831)
1% Decrease		25,167	23,831
Increase (decrease) of shareholder's equity
Disclosure of Sensitivity analysis for Interest rates [Line Items]
1% Increase	[1]	(25,167)	(23,831)
1% Decrease	[1]	₩ 25,167	₩ 23,831
[1]	The effect on the shareholders' equity excluding the impact of income taxes.

Sensitivity analysis for electr

Sensitivity analysis for electricity rates (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Increase (decrease) of income before income tax
Disclosure of Sensitivity analysis for electricity rates [Line Items]
1% Increase		₩ 559,390	₩ 568,420
1% Decrease		(559,390)	(568,420)
Increase (decrease) of shareholder's equity
Disclosure of Sensitivity analysis for electricity rates [Line Items]
1% Increase	[1]	559,390	568,420
1% Decrease	[1]	₩ (559,390)	₩ (568,420)
[1]	The effect on the shareholders' equity excluding the impact of income taxes.

Maturity analysis for non-deriv

Maturity analysis for non-derivative financial liabilities (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2019	Dec. 31, 2018
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Borrowings and debt securities		₩ 80,399,789	₩ 72,934,694
Finance lease liabilities		5,757,009	381,742
Trade and other payables		8,545,029	9,063,285
Financial guarantee contracts	[1]	3,338,566	1,310,817
Non-derivative financial liabilities, undiscounted cash flows		98,040,393	83,690,538
Less than 1 year
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Borrowings and debt securities		10,660,737	10,204,471
Finance lease liabilities		686,445	87,709
Trade and other payables		6,014,054	6,348,195
Financial guarantee contracts	[1]	937,091	91,722
Non-derivative financial liabilities, undiscounted cash flows		18,298,327	16,732,097
1~2 Years
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Borrowings and debt securities		10,997,510	9,274,378
Finance lease liabilities		617,449	87,709
Trade and other payables		382,809	150,479
Financial guarantee contracts	[1]	302,186	855,488
Non-derivative financial liabilities, undiscounted cash flows		12,299,954	10,368,054
2~5 Years
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Borrowings and debt securities		27,881,873	28,143,311
Finance lease liabilities		1,717,434	141,074
Trade and other payables		971,469	375,661
Financial guarantee contracts	[1]	32,314	363,607
Non-derivative financial liabilities, undiscounted cash flows		30,603,090	29,023,653
More than 5 years
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Borrowings and debt securities		30,859,669	25,312,534
Finance lease liabilities		2,735,681	65,250
Trade and other payables		1,176,697	2,188,950
Financial guarantee contracts	[1]	2,066,975	0
Non-derivative financial liabilities, undiscounted cash flows		₩ 36,839,022	₩ 27,566,734
[1]	This represents the total guarantee amounts associated with the financial guarantee contracts. Financial guarantee liabilities which are recognized as of December 31, 2018 and 2019 are KRW15,586 million and KRW 81,357 million, respectively.

Maturity analysis for non-der_2

Maturity analysis for non-derivative financial assets (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of maturity analysis for financial assets held for managing liquidity risk [Line Items]
Cash and cash equivalents		₩ 1,810,129	₩ 1,358,345	₩ 2,369,739	₩ 3,051,353
Financial assets at fair value through other comprehensive income		379,170	399,495
Financial assets at amortised cost		13,609	14,042
Loans and receivables		774,772	758,378
Long-term/short-term financial instruments		1,960,227	2,318,027
Financial assets at fair value through profit or loss		747,261	920,935
Trade and other receivables		9,711,107	9,622,813
Financial assets held for managing liquidity risk		15,396,275	15,392,035
Less than 1 year
Disclosure of maturity analysis for financial assets held for managing liquidity risk [Line Items]
Cash and cash equivalents		1,810,129	1,358,345
Financial assets at fair value through other comprehensive income		0	0
Financial assets at amortised cost		12,302	11,956
Loans and receivables		64,081	123,646
Long-term/short-term financial instruments		1,351,971	1,869,286
Financial assets at fair value through profit or loss		131,385	313,893
Trade and other receivables		7,703,746	7,795,619
Financial assets held for managing liquidity risk		11,073,614	11,472,745
1~5 Years
Disclosure of maturity analysis for financial assets held for managing liquidity risk [Line Items]
Cash and cash equivalents		0	0
Financial assets at fair value through other comprehensive income		0	0
Financial assets at amortised cost		1,307	2,086
Loans and receivables		346,583	314,744
Long-term/short-term financial instruments		269,863	278,899
Financial assets at fair value through profit or loss		79	81,828
Trade and other receivables		980,951	1,067,800
Financial assets held for managing liquidity risk		1,598,783	1,745,357
More than 5 years
Disclosure of maturity analysis for financial assets held for managing liquidity risk [Line Items]
Cash and cash equivalents		0	0
Financial assets at fair value through other comprehensive income		0	0
Financial assets at amortised cost		0	0
Loans and receivables		336,502	319,988
Long-term/short-term financial instruments		0	164,057
Financial assets at fair value through profit or loss		0	483,398
Trade and other receivables		818,431	701,743
Financial assets held for managing liquidity risk		1,154,933	1,669,186
Other
Disclosure of maturity analysis for financial assets held for managing liquidity risk [Line Items]
Cash and cash equivalents	[1]	0	0
Financial assets at fair value through other comprehensive income	[1]	379,170	399,495
Financial assets at amortised cost	[1]	0	0
Loans and receivables	[1]	27,606	0
Long-term/short-term financial instruments	[1]	338,393	5,785
Financial assets at fair value through profit or loss	[1]	615,797	41,816
Trade and other receivables	[1]	207,979	57,651
Financial assets held for managing liquidity risk	[1]	₩ 1,568,945	₩ 504,747
[1]	The maturities cannot be presently determined.

Maturity analysis for derivativ

Maturity analysis for derivative financial liabilities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2019	Dec. 31, 2018
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Derivative financial liabilities, undiscounted cash flows	₩ (178,556)	₩ 83,336
Net settlement | Not Designated as Hedging Instrument
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Derivative financial liabilities, undiscounted cash flows	(3,017)	0
Gross settlement | Not Designated as Hedging Instrument
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Derivative financial liabilities, undiscounted cash flows	(58,725)	90,706
Gross settlement | Designated as Hedging Instrument
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Derivative financial liabilities, undiscounted cash flows	(116,814)	(7,370)
Less than 1 year
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Derivative financial liabilities, undiscounted cash flows	(77,874)	10,888
Less than 1 year | Net settlement | Not Designated as Hedging Instrument
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Derivative financial liabilities, undiscounted cash flows	(3,017)	0
Less than 1 year | Gross settlement | Not Designated as Hedging Instrument
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Derivative financial liabilities, undiscounted cash flows	(15,011)	5,734
Less than 1 year | Gross settlement | Designated as Hedging Instrument
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Derivative financial liabilities, undiscounted cash flows	(59,846)	5,154
1~2 Years
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Derivative financial liabilities, undiscounted cash flows	(29,761)	(26,882)
1~2 Years | Gross settlement | Not Designated as Hedging Instrument
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Derivative financial liabilities, undiscounted cash flows	(8,295)	16,565
1~2 Years | Gross settlement | Designated as Hedging Instrument
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Derivative financial liabilities, undiscounted cash flows	(21,466)	(43,447)
2~5 Years
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Derivative financial liabilities, undiscounted cash flows	(41,568)	100,123
2~5 Years | Gross settlement | Not Designated as Hedging Instrument
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Derivative financial liabilities, undiscounted cash flows	(39,654)	28,283
2~5 Years | Gross settlement | Designated as Hedging Instrument
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Derivative financial liabilities, undiscounted cash flows	(1,914)	71,840
More than 5 years
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Derivative financial liabilities, undiscounted cash flows	(29,353)	(793)
More than 5 years | Gross settlement | Not Designated as Hedging Instrument
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Derivative financial liabilities, undiscounted cash flows	4,235	40,124
More than 5 years | Gross settlement | Designated as Hedging Instrument
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Derivative financial liabilities, undiscounted cash flows	₩ (33,588)	₩ (40,917)

Fair value measurement of instr

Fair value measurement of instruments (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2019	Dec. 31, 2018
Financial assets, category | At fair value
Disclosure of fair value measurement of instruments [Line Items]
Book value		₩ 1,437,464	₩ 1,422,765
Fair value		1,437,464	1,422,765
Financial assets, category | At amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		14,226,421	14,022,525
Fair value		14,226,421	14,022,525
Financial assets at fair value through other comprehensive income | At fair value
Disclosure of fair value measurement of instruments [Line Items]
Book value		379,170	399,495
Fair value		379,170	399,495
Derivative Financial Instruments, Assets | Not Designated as Hedging Instrument | At fair value
Disclosure of fair value measurement of instruments [Line Items]
Book value		165,204	37,631
Fair value		165,204	37,631
Derivative Financial Instruments, Assets | Designated as Hedging Instrument | At fair value
Disclosure of fair value measurement of instruments [Line Items]
Book value		145,829	64,704
Fair value		145,829	64,704
Long-term financial instruments | At fair value
Disclosure of fair value measurement of instruments [Line Items]
Book value			0
Fair value			0
Long-term financial instruments | At amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		608,256	448,741
Fair value		608,256	448,741
Short-term financial instruments | At fair value
Disclosure of fair value measurement of instruments [Line Items]
Book value			0
Fair value			0
Short-term financial instruments | At amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		1,351,971	1,869,286
Fair value		1,351,971	1,869,286
Financial assets at fair value through profit or loss | At fair value
Disclosure of fair value measurement of instruments [Line Items]
Book value		747,261	920,935
Fair value		747,261	920,935
Financial assets at amortized cost | At amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		13,609	14,042
Fair value		13,609	14,042
Held-to-maturity investments | At amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value			0
Fair value			0
Loans and receivables | At amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		738,707	718,674
Fair value		738,707	718,674
Trade receivables | At amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		9,703,749	9,613,437
Fair value		9,703,749	9,613,437
Cash and Cash Equivalents | At amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		1,810,129	1,358,345
Fair value		1,810,129	1,358,345
Liabilities | At fair value
Disclosure of fair value measurement of instruments [Line Items]
Book value		169,960	312,163
Fair value		169,960	312,163
Liabilities | At amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		81,491,703	70,381,718
Fair value		85,246,892	73,009,715
Derivative Financial Instruments, Liabilities | Not Designated as Hedging Instrument | At fair value
Disclosure of fair value measurement of instruments [Line Items]
Book value		53,147	99,010
Fair value		53,147	99,010
Derivative Financial Instruments, Liabilities | Designated as Hedging Instrument | At fair value
Disclosure of fair value measurement of instruments [Line Items]
Book value		116,813	213,153
Fair value		116,813	213,153
Secured borrowings | At amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		227,135	741,029
Fair value		227,135	741,029
Unsecured bond | At amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		63,171,664	56,603,988
Fair value		66,917,421	58,804,070
Lease liabilities | At amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		5,070,133	0
Fair value		5,070,133	0
Finance lease liabilities | At amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		0	283,806
Fair value		0	283,806
Unsecured borrowings | At amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		4,104,523	3,522,602
Fair value		4,113,955	3,950,517
Trade and other payables | At amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value	[1]	8,545,029	9,063,285
Fair value	[1]	8,545,029	9,063,285
Bank overdraft | At amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		373,219	167,008
Fair value		₩ 373,219	₩ 167,008
[1]	Excludes lease liabilities (current year) and finance lease liabilities (prior year)

Significant unobservable inputs

Significant unobservable inputs used in fair value measurement of liabilities (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Derivatives
Disclosure of significant unobservable inputs used in fair value measurement of liabilities [Line Items]
Interest rate, significant unobservable inputs, liabilities	0.01% ~ 4.16%	0.02% ~ 4.16%
Borrowings and debt securities
Disclosure of significant unobservable inputs used in fair value measurement of liabilities [Line Items]
Interest rate, significant unobservable inputs, liabilities	0.17% ~ 3.90%	0.51% ~ 5.14%
Finance lease
Disclosure of significant unobservable inputs used in fair value measurement of liabilities [Line Items]
Interest rate, significant unobservable inputs, liabilities	1.38% ~ 10.83%	3.50% ~ 10.83%

Fair value measurement of asset

Fair value measurement of assets (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of fair value measurement of assets [Line Items]
Financial assets at fair value through other comprehensive income	₩ 379,170	₩ 399,495	₩ 0
Financial assets at fair value through profit or loss	747,261	920,935
At fair value
Disclosure of fair value measurement of assets [Line Items]
Financial assets at fair value through other comprehensive income	379,170	399,495
Derivative assets	311,033	102,335
Financial assets at fair value through profit or loss	747,261	920,935
Total	1,437,464	1,422,765
At fair value | Level 1
Disclosure of fair value measurement of assets [Line Items]
Financial assets at fair value through other comprehensive income	201,202	210,056
Derivative assets	0	0
Financial assets at fair value through profit or loss	0	106,600
Total	201,202	316,656
At fair value | Level 2
Disclosure of fair value measurement of assets [Line Items]
Financial assets at fair value through other comprehensive income	0	0
Derivative assets	308,399	100,490
Financial assets at fair value through profit or loss	742,105	809,283
Total	1,050,504	909,773
At fair value | Level 3
Disclosure of fair value measurement of assets [Line Items]
Financial assets at fair value through other comprehensive income	177,968	189,439
Derivative assets	2,634	1,845
Financial assets at fair value through profit or loss	5,156	5,052
Total	₩ 185,758	₩ 196,336

Fair value measurement of liabi

Fair value measurement of liabilities (Details) - At fair value - KRW (₩) ₩ in Millions	Dec. 31, 2019	Dec. 31, 2018
Disclosure of fair value measurement of liabilities [Line Items]
Derivative liabilities	₩ 169,960	₩ 312,163
Level 2
Disclosure of fair value measurement of liabilities [Line Items]
Derivative liabilities	169,960	310,008
Level 3
Disclosure of fair value measurement of liabilities [Line Items]
Derivative liabilities	₩ 0	₩ 2,155

Reconciliation of changes in fa

Reconciliation of changes in fair value measurement, assets (Details) - At fair value - Level 3 - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Financial assets at fair value through profit or loss, category [Member]
Reconciliation of changes in fair value measurement, assets [Line Items]
Beginning balance	₩ 5,052	₩ 0
Changes in fair value measurement, assets
Effect of change in accounting policy		5,038
Acquisition	40	0
Reclassified category	0	0
Valuation	64	14
Disposal	0	0
Foreign currency translation	0	0
Ending balance	5,156	5,052
Financial assets at fair value through other comprehensive income [Member]
Reconciliation of changes in fair value measurement, assets [Line Items]
Beginning balance	189,439	0
Changes in fair value measurement, assets
Effect of change in accounting policy		197,450
Acquisition	1,876	0
Reclassified category	0	0
Valuation	3,715	(11,744)
Disposal	(19,315)	(326)
Foreign currency translation	2,253	4,059
Ending balance	₩ 177,968	₩ 189,439

Service Concession Arrangemen_3

Service Concession Arrangements (Details) ₩ in Millions	12 Months Ended
	Dec. 31, 2019KRW (₩)
Disclosure of detailed information about service concession arrangements [Line Items]
Gas Complex - Thermal Power Plant at Ilijan, Philippines (BOT)	₩ 292,264
Hydroelectric Power Generation at Semangka, Indonesia (BOT)	674,631
Less than 1 year
Disclosure of detailed information about service concession arrangements [Line Items]
Gas Complex - Thermal Power Plant at Ilijan, Philippines (BOT)	120,937
Hydroelectric Power Generation at Semangka, Indonesia (BOT)	28,921
1~2 Years
Disclosure of detailed information about service concession arrangements [Line Items]
Gas Complex - Thermal Power Plant at Ilijan, Philippines (BOT)	120,937
Hydroelectric Power Generation at Semangka, Indonesia (BOT)	28,853
2~3 Years
Disclosure of detailed information about service concession arrangements [Line Items]
Gas Complex - Thermal Power Plant at Ilijan, Philippines (BOT)	50,390
Hydroelectric Power Generation at Semangka, Indonesia (BOT)	28,885
Over 3 years
Disclosure of detailed information about service concession arrangements [Line Items]
Gas Complex - Thermal Power Plant at Ilijan, Philippines (BOT)	0
Hydroelectric Power Generation at Semangka, Indonesia (BOT)	₩ 587,972

Transactions between related pa

Transactions between related parties (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Dongducheon Dream Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	₩ 7,071	₩ 6,093	₩ 17,041
Electricity purchase	689,510	828,547	813,440
Outstanding balances for related party transactions [Abstract]
Trade receivables	323	332
Trade payables	85,920	74,651
Non-trade receivables and others	267	298
Non-trade payables and others	12	10
Korea Gas Corporation
Disclosure of transactions between related parties [Line Items]
Electricity sales	116,484	99,933	88,011
Purchase of power generation fuel	4,049,486	5,191,243	3,245,519
Outstanding balances for related party transactions [Abstract]
Trade receivables	9,267	9,439
Trade payables	462,138	601,092
Non-trade receivables and others	38	498
Non-trade payables and others	560	314
Daegu Photovoltaic Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	327	128	349
REC purchase	3,626	3,745	3,646
Outstanding balances for related party transactions [Abstract]
Trade payables	69	83
Jeongam Wind Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	1,198	724	30
Outstanding balances for related party transactions [Abstract]
Trade receivables	165	151
Non-trade payables and others	6	2
Korea Power Engineering Service Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service sales	348	840	1,317
Service purchase	1,774	1,765	1,292
Outstanding balances for related party transactions [Abstract]
Trade receivables	74	0
Non-trade receivables and others	74	0
KS Solar Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	0	0	5
REC purchase	0	0	900
Heang Bok Do Si Photovoltaic Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	2	2	2
Rental fee and others	450	455	570
Korea Electric Power Industrial Development Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service sales	11,085	10,422	14,044
Electricity metering service fee	245,057	261,668	289,293
Outstanding balances for related party transactions [Abstract]
Trade receivables	243	278
Trade payables	3,756	0
Non-trade receivables and others	43	51
Non-trade payables and others	3,827	13,102
Goseong Green Energy Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	19,245	10,024	24,069
Electricity purchase	32	0	0
Outstanding balances for related party transactions [Abstract]
Trade receivables	103	0
Non-trade receivables and others	5,285	0
Non-trade payables and others	65,626	43,020
Gangneung Eco Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service sales	7,446	4,928	2,391
Service purchase	0	19	0
Outstanding balances for related party transactions [Abstract]
Trade receivables	115	1
Non-trade receivables and others	65	99
Shin Pyeongtaek Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	21,218	8,468	9,025
Electricity purchase	119,162	0	0
Outstanding balances for related party transactions [Abstract]
Trade receivables	1,013	123
Trade payables	64,696	0
Non-trade receivables and others	2,281	242
Non-trade payables and others	61	82
Naepo Green Energy Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	154	160	185
Outstanding balances for related party transactions [Abstract]
Trade receivables	18	17
Noeul Green Energy Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	30	30	32
REC purchase	22,767	18,282	15,862
Outstanding balances for related party transactions [Abstract]
Trade receivables	3	3
Non-trade payables and others	1,855	8,774
Samcheok Eco Materials Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	627	605	237
Electricity purchase	9,425	3,819	14
Outstanding balances for related party transactions [Abstract]
Trade receivables	59	61
YTN Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	2,257	2,043	1,987
Electricity purchase	333	322	731
Outstanding balances for related party transactions [Abstract]
Trade receivables	97	98
Non-trade payables and others	0	11
Busan Green Energy Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	18	19	120
Electricity purchase	13,811	25,123	12,189
Outstanding balances for related party transactions [Abstract]
Trade receivables	1	1
Non-trade payables and others	606	10,882
Gunsan Bio Energy Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	4,755	3,611	0
Electricity purchase	3,022	0	0
Outstanding balances for related party transactions [Abstract]
Non-trade receivables and others	0	3,458
Korea Electric Vehicle Charge Service
Disclosure of transactions between related parties [Line Items]
Electricity sales	1,029	578	700
Electricity purchase	536	605	1,093
Outstanding balances for related party transactions [Abstract]
Trade receivables	137	69
Non-trade receivables and others	529	354
Non-trade payables and others	0	56
Tamra Offshore Wind Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	0	58	55
Electricity purchase	0	8,371	2,105
Daegu clean Energy Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	0	126	421
Outstanding balances for related party transactions [Abstract]
Non-trade receivables and others	0	17
Cheongna Energy Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service sales	9,922	11,688	7,980
Service purchase	58,747	58	59
Outstanding balances for related party transactions [Abstract]
Trade receivables	1,074	183
Non-trade payables and others		0
YaksuESS Co., Ltd [Member]
Disclosure of transactions between related parties [Line Items]
Service purchase	1,191	0	0
Outstanding balances for related party transactions [Abstract]
Trade payables	525	0
Gangwon Wind Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	2,433	2,402	994
Electricity purchase	24,116	25,407	25,968
Outstanding balances for related party transactions [Abstract]
Trade receivables	7	10
Trade payables	2,979	2,547
Gwangyang Green Energy Co., Ltd
Disclosure of transactions between related parties [Line Items]
Electricity sales	122	874	0
Outstanding balances for related party transactions [Abstract]
Non-trade receivables and others	1,334	0
Hyundai Green Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Design service	13,106	14,031	14,280
Electricity purchase	507,662	480,815	458,378
Outstanding balances for related party transactions [Abstract]
Trade receivables	502	390
Trade payables	41,587	38,072
Korea Power Exchange
Disclosure of transactions between related parties [Line Items]
Service sales	7,670	6,854	8,446
Trading Fees	120,509	137,489	207,855
Outstanding balances for related party transactions [Abstract]
Trade receivables	1,142	847
Non-trade receivables and others	114	229
Non-trade payables and others	4,160	1,214
Hyundai Energy
Disclosure of transactions between related parties [Line Items]
Service sales	3,437	1,718	15,627
Electricity purchase	2,847	3,445	87,607
Outstanding balances for related party transactions [Abstract]
Trade receivables	128	57
Trade payables	175	259
Non-trade receivables and others	12,532	9,664
Non-trade payables and others	9,178	8,021
Taebaek Wind Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service sales	991	614	813
REC purchase	7,070	8,582	6,534
Outstanding balances for related party transactions [Abstract]
Trade receivables		0
Trade payables	358	453
Non-trade payables and others	243	291
Taeback Guinemi Wind Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	77	0	0
Electricity purchase	349	0	0
Outstanding balances for related party transactions [Abstract]
Trade payables	190	0
Non-trade receivables and others	2	0
Pyeongchang Wind Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Design service	1,189	1,166	1,176
Service purchase	5,188	6,994	4,033
Outstanding balances for related party transactions [Abstract]
Trade receivables	4	4
Non-trade payables and others	0	25
Daeryun Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	1,879	1,731	1,796
Electricity purchase	144,862	184,063	146,189
Outstanding balances for related party transactions [Abstract]
Trade receivables	144	178
Trade payables	19,843	15,845
Changjuk Wind Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	927	758	788
Electricity purchase	6,994	7,929	6,981
Outstanding balances for related party transactions [Abstract]
Trade receivables		0
Trade payables	447	455
Non-trade payables and others	280	273
GS Donghae Electric Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	15,792	7,238	11,204
Electricity purchase	681,379	780,233	351,367
Outstanding balances for related party transactions [Abstract]
Trade receivables	175	245
Trade payables	69,811	69,820
Non-trade receivables and others	367	2,537
Non-trade payables and others	16	59
KNH Solar Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	17	17	17
Electricity purchase	3,377	3,586	3,947
Outstanding balances for related party transactions [Abstract]
Trade receivables	1	1
Non-trade payables and others	0	0
S-Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service sales	6,535	9,118	12,852
Electricity purchase	522,469	507,875	457,329
Outstanding balances for related party transactions [Abstract]
Trade receivables	89	922
Trade payables	53,705	56,897
Non-trade receivables and others	43	34
Non-trade payables and others	0	16
PND solar., Ltd
Disclosure of transactions between related parties [Line Items]
Electricity sales	407	12	0
Service purchase	557	0	0
Outstanding balances for related party transactions [Abstract]
Trade receivables	0	3
Hyundai Eco Energy Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	117	0	0
Electricity purchase	6,810	0	0
Outstanding balances for related party transactions [Abstract]
Trade receivables	16	0
Hadong Mineral Fiber Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service purchase	0	60	0
Green Biomass Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	0	0	0
Woodchip purchase	0	440	1,345
Outstanding balances for related party transactions [Abstract]
Non-trade payables and others		0
YeongGwang Yaksu Wind Electric. Co., Ltd
Disclosure of transactions between related parties [Line Items]
Electricity sales	81	0	0
Electricity purchase	6,511	2,437	0
Outstanding balances for related party transactions [Abstract]
Trade receivables	5	0
Trade payables	0	2,679
Korea Energy Solutions Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	52	0	0
Electricity purchase	15,000	0	0
Suwon New Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	5,606	0	0
Outstanding balances for related party transactions [Abstract]
Non-trade receivables and others	2,939	0
9 Associates (Overseas)
Disclosure of transactions between related parties [Line Items]
Electricity sales and others	98,450	60,318	21,864
Electricity purchase and Others	0	31	72
4 Associates (Overseas)
Outstanding balances for related party transactions [Abstract]
Non-trade receivables and others	1,112	455
Ecollite Co., Ltd.
Outstanding balances for related party transactions [Abstract]
Non-trade receivables and others	210	210
Daegu Green Power
Disclosure of transactions between related parties [Line Items]
Electricity sales	1,151	1,022	1,131
Electricity purchase	296,464	287,008	252,024
Outstanding balances for related party transactions [Abstract]
Trade receivables	113	110
Trade payables	28,980	32,609
Non-trade receivables and others	1	12
Daejung Offshore Wind Power Co., Ltd. [Member]
Disclosure of transactions between related parties [Line Items]
Electricity sales	1	1	1
KAPES, Inc.
Disclosure of transactions between related parties [Line Items]
Commission	504	648	1,420
Service purchase	142,511	77,758	164,165
Outstanding balances for related party transactions [Abstract]
Trade receivables	1	0
Trade payables		0
Non-trade receivables and others	0	253
Non-trade payables and others	50,738	338
Dangjin Eco Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Technical fee	4	3,424	670
Outstanding balances for related party transactions [Abstract]
Trade receivables	2	0
Non-trade receivables and others	0	18
Non-trade payables and others	0	0
Honam Wind Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	657	415	552
Electricity purchase	5,306	7,700	5,962
Outstanding balances for related party transactions [Abstract]
Trade payables	347	432
Non-trade payables and others	1,671	3,573
Seokmun Energy Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service sales	1,495	1,897	1,765
REC purchase	26,370	31,759	21,674
Outstanding balances for related party transactions [Abstract]
Trade receivables	51	39
Non-trade receivables and others	136	303
Non-trade payables and others	4,750	5,043
Incheon New Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Construction revenue	354	568	539
Outstanding balances for related party transactions [Abstract]
Trade receivables	0	128
KW Nuclear Components Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service sales	721	839	644
Outstanding balances for related party transactions [Abstract]
Trade receivables	4	4
Non-trade receivables and others	15	31
Chun-cheon Energy Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	2,397	2,471	4,855
REC purchase	313,471	320,954	194,136
Outstanding balances for related party transactions [Abstract]
Trade receivables	260	20
Trade payables	23,438	33,796
Non-trade receivables and others	5,362	308
Yeonggwangbaeksu Wind Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	1,744	1,540	1,654
Electricity purchase	11,739	11,366	11,124
Outstanding balances for related party transactions [Abstract]
Trade receivables	6	7
Trade payables	671	736
Non-trade receivables and others	157	0
Non-trade payables and others	1,526	789
Yeonggwang Wind Power Co., Ltd
Disclosure of transactions between related parties [Line Items]
Electricity sales	705	46	0
Electricity purchase	11,940	0	0
Outstanding balances for related party transactions [Abstract]
Trade receivables	10	10
Non-trade receivables and others	54	0
Non-trade payables and others	2,432	0
KEPCO-Uhde Inc.
Disclosure of transactions between related parties [Line Items]
Service sales	15	17	34
Outstanding balances for related party transactions [Abstract]
Non-trade payables and others	9	4
Busan Shinho Solar Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	452	362	87
REC purchase	7,843	7,901	7,984
Outstanding balances for related party transactions [Abstract]
Trade receivables	2	2
Trade payables	148	175
Non-trade payables and others	733	717
Daesan Green Energy Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	39	0	0
Outstanding balances for related party transactions [Abstract]
Trade receivables	6	0
Cheong-Song Noraesan Wind Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	6	0	0
Outstanding balances for related party transactions [Abstract]
Trade receivables	1	0
Saemangeum Solar Power Co., Ltd
Disclosure of transactions between related parties [Line Items]
Service sales	2,230	0	0
Outstanding balances for related party transactions [Abstract]
Non-trade receivables and others	2,197	0
Jaeun Resident Wind Power Plant Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	105	0	0
25 Joint ventures (Overseas)
Disclosure of transactions between related parties [Line Items]
Electricity sales and others	1,275,279	206,054	131,344
Electricity purchase and Others	7,232	1,404	2,785
14 Joint ventures (Overseas)
Outstanding balances for related party transactions [Abstract]
Trade receivables	51,700	30,208
Non-trade receivables and others	13,652	740
Non-trade payables and others	87,404	18,379
Global Trade Of Power System Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service purchase	502	565	414
Expressway Solar-light Power
Disclosure of transactions between related parties [Line Items]
Electricity purchase	3,067	3,513	2,941
Yeongwol Energy Station Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service sales	0	373	830
REC purchase	0	4,019	14,256
Outstanding balances for related party transactions [Abstract]
Trade receivables	0	0
DS POWER Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service sales	0	565	5,819
Outstanding balances for related party transactions [Abstract]
Trade receivables	0	0
Ulleungdo Natural Energy Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service sales	0	292	1,013
Service purchase	0	63	119
Korea Development Bank
Disclosure of transactions between related parties [Line Items]
Electricity sales	3,948	3,524	3,239
Dividend paid	20	166,876	418,407
Interest income	2,091	4,438	1,685
Interest expense	4,063	5,043	₩ 4,573
Outstanding balances for related party transactions [Abstract]
Non-trade receivables and others	146,416	12,125
Non-trade payables and others	152	218
Accrued interest income	1,630	1,147
Derivative assets	41,368	27,306
Derivative liabilities	₩ 6,531	₩ 18,095

Loans transactions between rela

Loans transactions between related parties (Details) ₩ in Millions	12 Months Ended
	Dec. 31, 2019KRW (₩)
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	₩ 105,264
Changes in Loans receivable transactions between related parties
Loans	55,834
Collection	(44,144)
Others	3,069
Ending balance	120,023
Hyundai Energy | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	2,465
Changes in Loans receivable transactions between related parties
Loans	0
Collection	0
Others	0
Ending balance	2,465
Hyundai Energy | Accumulated impairment [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	(2,465)
Changes in Loans receivable transactions between related parties
Loans	0
Collection	0
Others	0
Ending balance	(2,465)
Gunsan Bio Energy Co., Ltd. | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	9,396
Changes in Loans receivable transactions between related parties
Loans	3,000
Collection	0
Others	0
Ending balance	12,396
Gunsan Bio Energy Co., Ltd. | Accumulated impairment [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	0
Changes in Loans receivable transactions between related parties
Loans	(10,128)
Collection	0
Others	0
Ending balance	(10,128)
KNOC Nigerian East & West Oil | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	27,634
Changes in Loans receivable transactions between related parties
Loans	132
Collection	0
Others	910
Ending balance	28,676
KNOC Nigerian East & West Oil | Accumulated impairment [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	(6,065)
Changes in Loans receivable transactions between related parties
Loans	0
Collection	0
Others	(1,260)
Ending balance	(7,325)
PT Wampu Electric Power | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	14,880
Changes in Loans receivable transactions between related parties
Loans	0
Collection	0
Others	1,622
Ending balance	16,502
PT. Cirebon Electric Power | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	8,696
Changes in Loans receivable transactions between related parties
Loans	0
Collection	(8,900)
Others	782
Ending balance	578
Xe-Pian Xe-Namnoy Power | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	1,413
Changes in Loans receivable transactions between related parties
Loans	20,148
Collection	0
Others	(606)
Ending balance	20,955
Kelar S.A | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	48,694
Changes in Loans receivable transactions between related parties
Collection	(8,320)
Others	1,784
Ending balance	42,158
Chester Solar IV SpA | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	0
Changes in Loans receivable transactions between related parties
Loans	1,688
Collection	(1,688)
Others	0
Ending balance	0
Chun-cheon Energy Co., Ltd. | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	616
Changes in Loans receivable transactions between related parties
Loans	4,441
Collection	0
Others	0
Ending balance	5,057
RECURSOS SOLARES PV DE MEXICO II, S.A. DE C.V. | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	0
Changes in Loans receivable transactions between related parties
Loans	1,054
Collection	0
Others	1
Ending balance	1,055
HORUS SOLAR, S.A. DE C.V. | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	0
Changes in Loans receivable transactions between related parties
Loans	3,320
Collection	0
Others	3
Ending balance	3,323
SUNMEX RENOVABLES, S.A. DE C.V. | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	0
Changes in Loans receivable transactions between related parties
Loans	144
Collection	0
Others	0
Ending balance	144
Chester Solar V SpA | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	0
Changes in Loans receivable transactions between related parties
Loans	535
Collection	(535)
Others	0
Ending balance	0
Diego de Almagro Solar SpA | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	0
Changes in Loans receivable transactions between related parties
Loans	2,101
Collection	(2,101)
Others	0
Ending balance	0
Dangjin Eco Power Co., Ltd.(before the spin-off) | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	0
Changes in Loans receivable transactions between related parties
Loans	2,600
Collection	(2,600)
Others	0
Ending balance	0
DE Energia SpA | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	0
Changes in Loans receivable transactions between related parties
Loans	6,799
Collection	0
Others	(167)
Ending balance	6,632
Eumseong Natural Gas Power Co., Ltd. | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	0
Changes in Loans receivable transactions between related parties
Loans	20,000	[1]
Collection	(20,000)	[1]
Others	0	[1]
Ending balance	₩ 0	[1]
[1]	Eumseong Natural Gas Power Co., Ltd. was established by spin-off from Dangjin Eco Power Co., Ltd. and merged by the Company during the year ended December 31, 2019.

Borrowings transactions between

Borrowings transactions between related parties (Details) - Korea Development Bank ₩ in Millions	12 Months Ended
	Dec. 31, 2019KRW (₩)
Facility
Disclosure of Borrowings transactions between related parties [Line Items]
Beginning balance	₩ 66,793
Changes in Borrowings transactions between related parties [Abstract]
Borrowings	5,700
Repayment	(12,648)
Others	0
Ending balance	59,845
Others
Disclosure of Borrowings transactions between related parties [Line Items]
Beginning balance	4,154
Changes in Borrowings transactions between related parties [Abstract]
Borrowings	0
Repayment	(654)
Others	0
Ending balance	3,500
Operating funds
Disclosure of Borrowings transactions between related parties [Line Items]
Beginning balance	81,000
Changes in Borrowings transactions between related parties [Abstract]
Borrowings	172,442
Repayment	(73,992)
Others	(450)
Ending balance	179,000
Syndicated Loan
Disclosure of Borrowings transactions between related parties [Line Items]
Beginning balance	17,277
Changes in Borrowings transactions between related parties [Abstract]
Borrowings	0
Repayment	(1,055)
Others	863
Ending balance	₩ 17,085

Guarantees provided between the

Guarantees provided between the related parties (Details) ر.س in Thousands, $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2019KRW (₩)		Dec. 31, 2019USD ($)		Dec. 31, 2019SAR (ر.س)
Performance guarantees
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation
Name of Guarantee	Shuweihat Asia Power Investment B.V.		Shuweihat Asia Power Investment B.V.		Shuweihat Asia Power Investment B.V.
Name of Principal obligor	Shuweihat Asia Operation & Maintenance Company		Shuweihat Asia Operation & Maintenance Company		Shuweihat Asia Operation & Maintenance Company
Amount of guarantees | $			$ 11,000
Performance guarantees and others
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation
Name of Guarantee	Rabigh Electricity Company		Rabigh Electricity Company		Rabigh Electricity Company
Name of Principal obligor	Rabigh Operation & Maintenance Company Limited		Rabigh Operation & Maintenance Company Limited		Rabigh Operation & Maintenance Company Limited
Amount of guarantees | $			$ 1,387
Performance guarantees
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation
Name of Guarantee	SMBC Ho Chi Minh and others		SMBC Ho Chi Minh and others		SMBC Ho Chi Minh and others
Name of Principal obligor	Nghi Son 2 Power LLC		Nghi Son 2 Power LLC		Nghi Son 2 Power LLC
Amount of guarantees | $			$ 70,000
Debt guarantees
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation
Name of Guarantee	Export-Import Bank of Korea and others		Export-Import Bank of Korea and others		Export-Import Bank of Korea and others
Name of Principal obligor	Barakah One Company		Barakah One Company		Barakah One Company
Amount of guarantees | $			$ 900,000
Performance guarantees and others
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation
Name of Guarantee	Export-Import Bank of Korea and others		Export-Import Bank of Korea and others		Export-Import Bank of Korea and others
Name of Principal obligor	Barakah One Company		Barakah One Company		Barakah One Company
Amount of guarantees | $			$ 4,430,240
Performance guarantees
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation
Name of Guarantee	EPS Renewables Holdings, LLC, Santander Bank and others		EPS Renewables Holdings, LLC, Santander Bank and others		EPS Renewables Holdings, LLC, Santander Bank and others
Name of Principal obligor	RE Holiday Holdings LLC		RE Holiday Holdings LLC		RE Holiday Holdings LLC
Amount of guarantees | $			$ 223,000
Performance guarantees
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation
Name of Guarantee	EPS Renewables Holdings, LLC, Santander Bank and others		EPS Renewables Holdings, LLC, Santander Bank and others		EPS Renewables Holdings, LLC, Santander Bank and others
Name of Principal obligor	RE Pioneer Holdings LLC		RE Pioneer Holdings LLC		RE Pioneer Holdings LLC
Amount of guarantees | $			$ 170,000
Performance guarantees
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation
Name of Guarantee	EPS Renewables Holdings, LLC, Santander Bank and others		EPS Renewables Holdings, LLC, Santander Bank and others		EPS Renewables Holdings, LLC, Santander Bank and others
Name of Principal obligor	RE Barren Ridge 1 Holdings LLC		RE Barren Ridge 1 Holdings LLC		RE Barren Ridge 1 Holdings LLC
Amount of guarantees | $			$ 149,000
Performance guarantees
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation
Name of Guarantee	Hana Bank		Hana Bank		Hana Bank
Name of Principal obligor	Rabigh Electricity Company		Rabigh Electricity Company		Rabigh Electricity Company
Amount of guarantees | ر.س					ر.س 6,508
Debt guarantees
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation
Name of Guarantee	Hana Bank		Hana Bank		Hana Bank
Name of Principal obligor	Rabigh Electricity Company		Rabigh Electricity Company		Rabigh Electricity Company
Amount of guarantees | ر.س					ر.س 80,000
Performance guarantees
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation
Name of Guarantee	ING Bank		ING Bank		ING Bank
Name of Principal obligor	Shuweihat Asia Power Investment B.V. Amman Asia Electric Power Company		Shuweihat Asia Power Investment B.V. Amman Asia Electric Power Company		Shuweihat Asia Power Investment B.V. Amman Asia Electric Power Company
Amount of guarantees | $			$ 100,000
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.
Name of Guarantee	Hana Bank and others		Hana Bank and others		Hana Bank and others
Name of Principal obligor	Cheongna Energy Co., Ltd.		Cheongna Energy Co., Ltd.		Cheongna Energy Co., Ltd.
Amount of guarantees	₩ 1,411
Guarantees for supplemental funding and others
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd.	[1]	Korea Western Power Co., Ltd.	[1]	Korea Western Power Co., Ltd.	[1]
Name of Guarantee	Hana Bank and others	[1]	Hana Bank and others	[1]	Hana Bank and others	[1]
Name of Principal obligor	Cheongna Energy Co., Ltd.	[1]	Cheongna Energy Co., Ltd.	[1]	Cheongna Energy Co., Ltd.	[1]
Amount of guarantees	₩ 0	[1]
Payment guarantees for business reserve
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.
Name of Guarantee	Krung Thai Bank		Krung Thai Bank		Krung Thai Bank
Name of Principal obligor	Xe-Pian Xe-Namnoy Power Co., Ltd.		Xe-Pian Xe-Namnoy Power Co., Ltd.		Xe-Pian Xe-Namnoy Power Co., Ltd.
Amount of guarantees | $			$ 2,500
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.
Name of Guarantee	Krung Thai Bank		Krung Thai Bank		Krung Thai Bank
Name of Principal obligor	Xe-Pian Xe-Namnoy Power Co., Ltd.		Xe-Pian Xe-Namnoy Power Co., Ltd.		Xe-Pian Xe-Namnoy Power Co., Ltd.
Amount of guarantees	₩ 72,935
Impounding bonus guarantees
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.
Name of Guarantee	SK E&C		SK E&C		SK E&C
Name of Principal obligor	Xe-Pian Xe-Namnoy Power Co., Ltd.		Xe-Pian Xe-Namnoy Power Co., Ltd.		Xe-Pian Xe-Namnoy Power Co., Ltd.
Amount of guarantees | $			$ 5,000
Performance guarantees and others
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.
Name of Guarantee	Saudi Arabia British Bank		Saudi Arabia British Bank		Saudi Arabia British Bank
Name of Principal obligor	Rabigh Operation & Maintenance Company Limited		Rabigh Operation & Maintenance Company Limited		Rabigh Operation & Maintenance Company Limited
Amount of guarantees | ر.س					ر.س 5,600
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.
Name of Guarantee	Korea Development Bank		Korea Development Bank		Korea Development Bank
Name of Principal obligor	Daegu Photovoltaic Co., Ltd.		Daegu Photovoltaic Co., Ltd.		Daegu Photovoltaic Co., Ltd.
Amount of guarantees	₩ 2,060
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd.	[2]	Korea Western Power Co., Ltd.	[2]	Korea Western Power Co., Ltd.	[2]
Name of Guarantee	Kookmin Bank and others	[2]	Kookmin Bank and others	[2]	Kookmin Bank and others	[2]
Name of Principal obligor	Dongducheon Dream Power Co., Ltd.	[2]	Dongducheon Dream Power Co., Ltd.	[2]	Dongducheon Dream Power Co., Ltd.	[2]
Amount of guarantees	₩ 41,531	[2]
Debt guarantees
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.
Name of Guarantee	BNK Securities and others		BNK Securities and others		BNK Securities and others
Name of Principal obligor	Dongducheon Dream Power Co., Ltd.		Dongducheon Dream Power Co., Ltd.		Dongducheon Dream Power Co., Ltd.
Amount of guarantees	₩ 20,300
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.
Name of Guarantee	Woori Bank		Woori Bank		Woori Bank
Name of Principal obligor	PT. Mutiara Jawa		PT. Mutiara Jawa		PT. Mutiara Jawa
Amount of guarantees	₩ 1,438
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.
Name of Guarantee	Nonghyup Bank		Nonghyup Bank		Nonghyup Bank
Name of Principal obligor	Heang Bok Do Si Photovoltaic Power Co., Ltd.		Heang Bok Do Si Photovoltaic Power Co., Ltd.		Heang Bok Do Si Photovoltaic Power Co., Ltd.
Amount of guarantees	₩ 215
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.
Name of Guarantee	Kookmin Bank		Kookmin Bank		Kookmin Bank
Name of Principal obligor	Shin Pyeongtaek Power Co., Ltd.		Shin Pyeongtaek Power Co., Ltd.		Shin Pyeongtaek Power Co., Ltd.
Amount of guarantees	₩ 66,956
Guarantees for supplemental funding
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd.	[1]	Korea Western Power Co., Ltd.	[1]	Korea Western Power Co., Ltd.	[1]
Name of Guarantee	Kookmin Bank and others	[1]	Kookmin Bank and others	[1]	Kookmin Bank and others	[1]
Name of Principal obligor	Shin Pyeongtaek Power Co., Ltd.	[1]	Shin Pyeongtaek Power Co., Ltd.	[1]	Shin Pyeongtaek Power Co., Ltd.	[1]
Amount of guarantees	₩ 0	[1]
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.
Name of Guarantee	Korea Development Bank and others		Korea Development Bank and others		Korea Development Bank and others
Name of Principal obligor	Busan Shinho Solar Power Co., Ltd.		Busan Shinho Solar Power Co., Ltd.		Busan Shinho Solar Power Co., Ltd.
Amount of guarantees	₩ 5,045
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.
Name of Guarantee	Kookmin Bank and others		Kookmin Bank and others		Kookmin Bank and others
Name of Principal obligor	Seokmun Energy Co., Ltd.		Seokmun Energy Co., Ltd.		Seokmun Energy Co., Ltd.
Amount of guarantees	₩ 17,342
Guarantees for supplemental funding
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.	[1]	Korea East-West Power Co., Ltd.	[1]	Korea East-West Power Co., Ltd.	[1]
Name of Guarantee	Kookmin Bank and others	[1]	Kookmin Bank and others	[1]	Kookmin Bank and others	[1]
Name of Principal obligor	Seokmun Energy Co., Ltd.	[1]	Seokmun Energy Co., Ltd.	[1]	Seokmun Energy Co., Ltd.	[1]
Amount of guarantees	₩ 0	[1]
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.
Name of Guarantee	Kookmin Bank and others		Kookmin Bank and others		Kookmin Bank and others
Name of Principal obligor	Chun-cheon Energy Co., Ltd.		Chun-cheon Energy Co., Ltd.		Chun-cheon Energy Co., Ltd.
Amount of guarantees	₩ 34,872
Guarantees for supplemental funding
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.	[1]	Korea East-West Power Co., Ltd.	[1]	Korea East-West Power Co., Ltd.	[1]
Name of Guarantee	Kookmin Bank and others	[1]	Kookmin Bank and others	[1]	Kookmin Bank and others	[1]
Name of Principal obligor	Chun-cheon Energy Co., Ltd.	[1]	Chun-cheon Energy Co., Ltd.	[1]	Chun-cheon Energy Co., Ltd.	[1]
Amount of guarantees	₩ 20,000	[1]
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.
Name of Guarantee	Shinhan Bank and others		Shinhan Bank and others		Shinhan Bank and others
Name of Principal obligor	Honam Wind Power Co., Ltd.		Honam Wind Power Co., Ltd.		Honam Wind Power Co., Ltd.
Amount of guarantees	₩ 4,375
Guarantees for supplemental funding
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.	[1]	Korea East-West Power Co., Ltd.	[1]	Korea East-West Power Co., Ltd.	[1]
Name of Guarantee	Shinhan Bank and others	[1]	Shinhan Bank and others	[1]	Shinhan Bank and others	[1]
Name of Principal obligor	Honam Wind Power Co., Ltd.	[1]	Honam Wind Power Co., Ltd.	[1]	Honam Wind Power Co., Ltd.	[1]
Amount of guarantees	₩ 0	[1]
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.
Name of Guarantee	Korea Development Bank and others		Korea Development Bank and others		Korea Development Bank and others
Name of Principal obligor	GS Donghae Electric Power Co., Ltd.		GS Donghae Electric Power Co., Ltd.		GS Donghae Electric Power Co., Ltd.
Amount of guarantees	₩ 255,983
Guarantees for supplemental funding
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.	[1]	Korea East-West Power Co., Ltd.	[1]	Korea East-West Power Co., Ltd.	[1]
Name of Guarantee	Korea Development Bank and others	[1]	Korea Development Bank and others	[1]	Korea Development Bank and others	[1]
Name of Principal obligor	GS Donghae Electric Power Co., Ltd.	[1]	GS Donghae Electric Power Co., Ltd.	[1]	GS Donghae Electric Power Co., Ltd.	[1]
Amount of guarantees	₩ 0	[1]
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.
Name of Guarantee	Kookmin Bank and others		Kookmin Bank and others		Kookmin Bank and others
Name of Principal obligor	Yeonggwangbaeksu Wind Power Co., Ltd.		Yeonggwangbaeksu Wind Power Co., Ltd.		Yeonggwangbaeksu Wind Power Co., Ltd.
Amount of guarantees	₩ 3,040
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.
Name of Guarantee	KDB Capital Corporation and others		KDB Capital Corporation and others		KDB Capital Corporation and others
Name of Principal obligor	Yeonggwang Wind Power Co., Ltd.		Yeonggwang Wind Power Co., Ltd.		Yeonggwang Wind Power Co., Ltd.
Amount of guarantees	₩ 17,627
Guarantees for supplemental funding
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.	[1]	Korea East-West Power Co., Ltd.	[1]	Korea East-West Power Co., Ltd.	[1]
Name of Guarantee	KDB Capital Corporation and others	[1]	KDB Capital Corporation and others	[1]	KDB Capital Corporation and others	[1]
Name of Principal obligor	Yeonggwang Wind Power Co., Ltd.	[1]	Yeonggwang Wind Power Co., Ltd.	[1]	Yeonggwang Wind Power Co., Ltd.	[1]
Amount of guarantees	₩ 0	[1]
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.
Name of Guarantee	IBK		IBK		IBK
Name of Principal obligor	Daesan Green Energy Co., Ltd.		Daesan Green Energy Co., Ltd.		Daesan Green Energy Co., Ltd.
Amount of guarantees	₩ 17,182
Guarantees for supplemental funding
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.	[1]	Korea East-West Power Co., Ltd.	[1]	Korea East-West Power Co., Ltd.	[1]
Name of Guarantee	IBK	[1]	IBK	[1]	IBK	[1]
Name of Principal obligor	Daesan Green Energy Co., Ltd.	[1]	Daesan Green Energy Co., Ltd.	[1]	Daesan Green Energy Co., Ltd.	[1]
Amount of guarantees	₩ 18,989	[1]
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.
Name of Guarantee	Samsung Fire & Marine Insurance Co., Ltd. and others		Samsung Fire & Marine Insurance Co., Ltd. and others		Samsung Fire & Marine Insurance Co., Ltd. and others
Name of Principal obligor	Taebaek Gadeoksan Wind Power Co., Ltd.		Taebaek Gadeoksan Wind Power Co., Ltd.		Taebaek Gadeoksan Wind Power Co., Ltd.
Amount of guarantees	₩ 7,846
Debt guarantees
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.
Name of Guarantee	Sumitomo mitsui banking		Sumitomo mitsui banking		Sumitomo mitsui banking
Name of Principal obligor	PT. Tanjung Power Indonesia		PT. Tanjung Power Indonesia		PT. Tanjung Power Indonesia
Amount of guarantees | $			$ 24,544
Other guarantees
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.
Name of Guarantee	PT Adaro Indonesia		PT Adaro Indonesia		PT Adaro Indonesia
Name of Principal obligor	PT. Tanjung Power Indonesia		PT. Tanjung Power Indonesia		PT. Tanjung Power Indonesia
Amount of guarantees | $			$ 3,150
Guarantees for supplemental funding
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.	[1]	Korea East-West Power Co., Ltd.	[1]	Korea East-West Power Co., Ltd.	[1]
Name of Guarantee	Sumitomo mitsui banking and others	[1]	Sumitomo mitsui banking and others	[1]	Sumitomo mitsui banking and others	[1]
Name of Principal obligor	PT. Tanjung Power Indonesia	[1]	PT. Tanjung Power Indonesia	[1]	PT. Tanjung Power Indonesia	[1]
Amount of guarantees	₩ 0	[1]
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.
Name of Guarantee	MUFG and others		MUFG and others		MUFG and others
Name of Principal obligor	PT. Tanjung Power Indonesia		PT. Tanjung Power Indonesia		PT. Tanjung Power Indonesia
Amount of guarantees	₩ 34,327
Performance guarantees
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.
Name of Guarantee	Societe Generale		Societe Generale		Societe Generale
Name of Principal obligor	South Jamaica Power Company Limited		South Jamaica Power Company Limited		South Jamaica Power Company Limited
Amount of guarantees | $			$ 14,400
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.
Name of Guarantee	JCSD Trustee Services Limited and others		JCSD Trustee Services Limited and others		JCSD Trustee Services Limited and others
Name of Principal obligor	South Jamaica Power Company Limited		South Jamaica Power Company Limited		South Jamaica Power Company Limited
Amount of guarantees	₩ 13,863
Guarantees for supplemental funding
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	EWP Barbados 1 SRL	[1],[3]	EWP Barbados 1 SRL	[1],[3]	EWP Barbados 1 SRL	[1],[3]
Name of Guarantee	JCSD Trustee Services Limited and others	[1],[3]	JCSD Trustee Services Limited and others	[1],[3]	JCSD Trustee Services Limited and others	[1],[3]
Name of Principal obligor	South Jamaica Power Company Limited	[1],[3]	South Jamaica Power Company Limited	[1],[3]	South Jamaica Power Company Limited	[1],[3]
Amount of guarantees	₩ 0	[1],[3]
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.
Name of Guarantee	Mirae Asset Daewoo Co., Ltd. and others		Mirae Asset Daewoo Co., Ltd. and others		Mirae Asset Daewoo Co., Ltd. and others
Name of Principal obligor	DE Energia SpA		DE Energia SpA		DE Energia SpA
Amount of guarantees	₩ 8,665
Debt guarantees
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.
Name of Guarantee	Mirae Asset Daewoo Co., Ltd. and others		Mirae Asset Daewoo Co., Ltd. and others		Mirae Asset Daewoo Co., Ltd. and others
Name of Principal obligor	DE Energia SpA		DE Energia SpA		DE Energia SpA
Amount of guarantees	₩ 6,632
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.
Name of Guarantee	Shinhan Bank and Kyobo Life Insurance Co., Ltd.		Shinhan Bank and Kyobo Life Insurance Co., Ltd.		Shinhan Bank and Kyobo Life Insurance Co., Ltd.
Name of Principal obligor	KNH Solar Co., Ltd.		KNH Solar Co., Ltd.		KNH Solar Co., Ltd.
Amount of guarantees	₩ 2,382
Performance guarantees and guarantees for supplemental funding
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.	[1]	Korea Southern Power Co., Ltd.	[1]	Korea Southern Power Co., Ltd.	[1]
Name of Guarantee	Shinhan Bank and Kyobo Life Insurance Co., Ltd.	[1]	Shinhan Bank and Kyobo Life Insurance Co., Ltd.	[1]	Shinhan Bank and Kyobo Life Insurance Co., Ltd.	[1]
Name of Principal obligor	KNH Solar Co., Ltd.	[1]	KNH Solar Co., Ltd.	[1]	KNH Solar Co., Ltd.	[1]
Amount of guarantees	₩ 0	[1]
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.
Name of Guarantee	Korea Development Bank and others		Korea Development Bank and others		Korea Development Bank and others
Name of Principal obligor	Daeryun Power Co., Ltd.		Daeryun Power Co., Ltd.		Daeryun Power Co., Ltd.
Amount of guarantees	₩ 26,247
Guarantees for supplemental funding and others
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.	[1]	Korea Southern Power Co., Ltd.	[1]	Korea Southern Power Co., Ltd.	[1]
Name of Guarantee	Korea Development Bank and others	[1]	Korea Development Bank and others	[1]	Korea Development Bank and others	[1]
Name of Principal obligor	Daeryun Power Co., Ltd.	[1]	Daeryun Power Co., Ltd.	[1]	Daeryun Power Co., Ltd.	[1]
Amount of guarantees	₩ 8,000	[1]
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.
Name of Guarantee	Shinhan Bank and others		Shinhan Bank and others		Shinhan Bank and others
Name of Principal obligor	Daegu Green Power Co., Ltd.		Daegu Green Power Co., Ltd.		Daegu Green Power Co., Ltd.
Amount of guarantees	₩ 22,824
Performance guarantees
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.
Name of Guarantee	Shinhan Bank and others		Shinhan Bank and others		Shinhan Bank and others
Name of Principal obligor	Daegu Green Power Co., Ltd.		Daegu Green Power Co., Ltd.		Daegu Green Power Co., Ltd.
Amount of guarantees	₩ 0
Performance guarantees
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.
Name of Guarantee	Hana Bank, MUFG		Hana Bank, MUFG		Hana Bank, MUFG
Name of Principal obligor	Kelar S.A		Kelar S.A		Kelar S.A
Amount of guarantees | $			$ 61,692
Debt guarantees
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.	[4]	Korea Southern Power Co., Ltd.	[4]	Korea Southern Power Co., Ltd.	[4]
Name of Guarantee	Shinhan Bank	[4]	Shinhan Bank	[4]	Shinhan Bank	[4]
Name of Principal obligor	Daehan Wind Power PSC	[4]	Daehan Wind Power PSC	[4]	Daehan Wind Power PSC	[4]
Amount of guarantees | $			$ 16,000	[4]
Performance guarantees
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.
Name of Guarantee	Shinhan Bank		Shinhan Bank		Shinhan Bank
Name of Principal obligor	Daehan Wind Power PSC		Daehan Wind Power PSC		Daehan Wind Power PSC
Amount of guarantees | $			$ 3,600
Debt guarantees
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.	[4]	Korea Southern Power Co., Ltd.	[4]	Korea Southern Power Co., Ltd.	[4]
Name of Guarantee	Shinhan Bank	[4]	Shinhan Bank	[4]	Shinhan Bank	[4]
Name of Principal obligor	Daehan Wind Power PSC	[4]	Daehan Wind Power PSC	[4]	Daehan Wind Power PSC	[4]
Amount of guarantees | $			$ 240	[4]
Performance Debt guarantees
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.	[4]	Korea Southern Power Co., Ltd.	[4]	Korea Southern Power Co., Ltd.	[4]
Name of Guarantee	Hana Bank	[4]	Hana Bank	[4]	Hana Bank	[4]
Name of Principal obligor	Daehan Wind Power PSC	[4]	Daehan Wind Power PSC	[4]	Daehan Wind Power PSC	[4]
Amount of guarantees | $			$ 1,898	[4]
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.
Name of Guarantee	Woori Bank and Shinhan Bank and others		Woori Bank and Shinhan Bank and others		Woori Bank and Shinhan Bank and others
Name of Principal obligor	Pyeongchang Wind Power Co., Ltd.		Pyeongchang Wind Power Co., Ltd.		Pyeongchang Wind Power Co., Ltd.
Amount of guarantees	₩ 5,877
Performance guarantees
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.
Name of Guarantee	Woori Bank and Shinhan Bank and others		Woori Bank and Shinhan Bank and others		Woori Bank and Shinhan Bank and others
Name of Principal obligor	Pyeongchang Wind Power Co., Ltd.		Pyeongchang Wind Power Co., Ltd.		Pyeongchang Wind Power Co., Ltd.
Amount of guarantees	₩ 0
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.
Name of Guarantee	IBK		IBK		IBK
Name of Principal obligor	Taebaek Guinemi Wind Power Co., Ltd.		Taebaek Guinemi Wind Power Co., Ltd.		Taebaek Guinemi Wind Power Co., Ltd.
Amount of guarantees	₩ 2,553
Guarantees for supplemental funding
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.	[1]	Korea Southern Power Co., Ltd.	[1]	Korea Southern Power Co., Ltd.	[1]
Name of Guarantee	IBK	[1]	IBK	[1]	IBK	[1]
Name of Principal obligor	Taebaek Guinemi Wind Power Co., Ltd.	[1]	Taebaek Guinemi Wind Power Co., Ltd.	[1]	Taebaek Guinemi Wind Power Co., Ltd.	[1]
Amount of guarantees	₩ 0	[1]
Guarantees for supplemental funding and performance guaranteeS
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.	[1]	Korea Southern Power Co., Ltd.	[1]	Korea Southern Power Co., Ltd.	[1]
Name of Guarantee	SK Securities.Co., LTD., KDB Capital Corporation, and others	[1]	SK Securities.Co., LTD., KDB Capital Corporation, and others	[1]	SK Securities.Co., LTD., KDB Capital Corporation, and others	[1]
Name of Principal obligor	Jeongam Wind Power Co., Ltd.	[1]	Jeongam Wind Power Co., Ltd.	[1]	Jeongam Wind Power Co., Ltd.	[1]
Amount of guarantees	₩ 0	[1]
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.
Name of Guarantee	SK Securities.Co., LTD., KDB Capital Corporation, and others		SK Securities.Co., LTD., KDB Capital Corporation, and others		SK Securities.Co., LTD., KDB Capital Corporation, and others
Name of Principal obligor	Jeongam Wind Power Co., Ltd.		Jeongam Wind Power Co., Ltd.		Jeongam Wind Power Co., Ltd.
Amount of guarantees	₩ 4,437
Guarantees for supplemental funding
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.	[1]	Korea Southern Power Co., Ltd.	[1]	Korea Southern Power Co., Ltd.	[1]
Name of Guarantee	Shinhan Bank and others	[1]	Shinhan Bank and others	[1]	Shinhan Bank and others	[1]
Name of Principal obligor	Taebaek Wind Power Co., Ltd	[1]	Taebaek Wind Power Co., Ltd	[1]	Taebaek Wind Power Co., Ltd	[1]
Amount of guarantees	₩ 0	[1]
Payment guarantees
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.	[2],[5]	Korea Southern Power Co., Ltd.	[2],[5]	Korea Southern Power Co., Ltd.	[2],[5]
Name of Guarantee	SEM Investment Co., Ltd.	[2],[5]	SEM Investment Co., Ltd.	[2],[5]	SEM Investment Co., Ltd.	[2],[5]
Name of Principal obligor	Samcheok Eco Materials Co., Ltd.	[2],[5]	Samcheok Eco Materials Co., Ltd.	[2],[5]	Samcheok Eco Materials Co., Ltd.	[2],[5]
Amount of guarantees	₩ 0	[2],[5]
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Kospo Chile SpA		Kospo Chile SpA		Kospo Chile SpA
Name of Guarantee	Export-Import Bank of Korea and others		Export-Import Bank of Korea and others		Export-Import Bank of Korea and others
Name of Principal obligor	Kelar S.A.		Kelar S.A.		Kelar S.A.
Amount of guarantees	₩ 70,462
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Kospo Chile SpA		Kospo Chile SpA		Kospo Chile SpA
Name of Guarantee	IBK		IBK		IBK
Name of Principal obligor	Chester Solar ISpA		Chester Solar ISpA		Chester Solar ISpA
Amount of guarantees	₩ 1,157
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Kospo Chile SpA		Kospo Chile SpA		Kospo Chile SpA
Name of Guarantee	IBK		IBK		IBK
Name of Principal obligor	Chester Solar IV SpA		Chester Solar IV SpA		Chester Solar IV SpA
Amount of guarantees	₩ 672
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Kospo Chile SpA		Kospo Chile SpA		Kospo Chile SpA
Name of Guarantee	IBK		IBK		IBK
Name of Principal obligor	Chester Solar V SpA		Chester Solar V SpA		Chester Solar V SpA
Amount of guarantees	₩ 146
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Kospo Chile SpA		Kospo Chile SpA		Kospo Chile SpA
Name of Guarantee	IBK		IBK		IBK
Name of Principal obligor	Diego de Almagro Solar Spa		Diego de Almagro Solar Spa		Diego de Almagro Solar Spa
Amount of guarantees	₩ 1,035
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Kospo Chile SpA		Kospo Chile SpA		Kospo Chile SpA
Name of Guarantee	IBK		IBK		IBK
Name of Principal obligor	Laurel SpA		Laurel SpA		Laurel SpA
Amount of guarantees	₩ 595
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.
Name of Guarantee	IBK and others		IBK and others		IBK and others
Name of Principal obligor	YeongGwang Yaksu Wind Electric. Co., Ltd.		YeongGwang Yaksu Wind Electric. Co., Ltd.		YeongGwang Yaksu Wind Electric. Co., Ltd.
Amount of guarantees	₩ 386
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.
Name of Guarantee	Korea Development Bank and others		Korea Development Bank and others		Korea Development Bank and others
Name of Principal obligor	Hyundai Green Power Co., Ltd.		Hyundai Green Power Co., Ltd.		Hyundai Green Power Co., Ltd.
Amount of guarantees	₩ 124,253
Debt guarantees
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.
Name of Guarantee	Mizuho Bank		Mizuho Bank		Mizuho Bank
Name of Principal obligor	PT. Cirebon Electric Power		PT. Cirebon Electric Power		PT. Cirebon Electric Power
Amount of guarantees | $			$ 11,248
Debt guarantees
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.
Name of Guarantee	SMBC		SMBC		SMBC
Name of Principal obligor	PT Wampu Electric Power		PT Wampu Electric Power		PT Wampu Electric Power
Amount of guarantees | $			$ 4,854
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.
Name of Guarantee	IBK		IBK		IBK
Name of Principal obligor	Green Energy Electricity Generation Co., Ltd.		Green Energy Electricity Generation Co., Ltd.		Green Energy Electricity Generation Co., Ltd.
Amount of guarantees	₩ 163
Guarantees for supplemental funding and others
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Midland Power Co., Ltd.	[1]	Korea Midland Power Co., Ltd.	[1]	Korea Midland Power Co., Ltd.	[1]
Name of Guarantee	IBK and others	[1]	IBK and others	[1]	IBK and others	[1]
Name of Principal obligor	Green Energy Electricity Generation Co., Ltd.	[1]	Green Energy Electricity Generation Co., Ltd.	[1]	Green Energy Electricity Generation Co., Ltd.	[1]
Amount of guarantees	₩ 0	[1]
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.
Name of Guarantee	IBK		IBK		IBK
Name of Principal obligor	YaksuESS Co., Ltd		YaksuESS Co., Ltd		YaksuESS Co., Ltd
Amount of guarantees	₩ 516
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.
Name of Guarantee	IBK		IBK		IBK
Name of Principal obligor	Namjeongsusang Solar Power Operatin Co., Ltd.		Namjeongsusang Solar Power Operatin Co., Ltd.		Namjeongsusang Solar Power Operatin Co., Ltd.
Amount of guarantees	₩ 812
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.
Name of Guarantee	IBK		IBK		IBK
Name of Principal obligor	Gwangbaek Solar Power Investment Co., Ltd.		Gwangbaek Solar Power Investment Co., Ltd.		Gwangbaek Solar Power Investment Co., Ltd.
Amount of guarantees	₩ 2,054
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea South-East Power Co., Ltd.	[6]	Korea South-East Power Co., Ltd.	[6]	Korea South-East Power Co., Ltd.	[6]
Name of Guarantee	IBK	[6]	IBK	[6]	IBK	[6]
Name of Principal obligor	Hyundai Energy Co., Ltd.	[6]	Hyundai Energy Co., Ltd.	[6]	Hyundai Energy Co., Ltd.	[6]
Amount of guarantees	₩ 0	[6]
Guarantees for supplemental funding and others
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea South-East Power Co., Ltd.	[1],[7]	Korea South-East Power Co., Ltd.	[1],[7]	Korea South-East Power Co., Ltd.	[1],[7]
Name of Guarantee	NH investment & securities Co., Ltd. and others	[1],[7]	NH investment & securities Co., Ltd. and others	[1],[7]	NH investment & securities Co., Ltd. and others	[1],[7]
Name of Principal obligor	Hyundai Energy Co., Ltd.	[1],[7]	Hyundai Energy Co., Ltd.	[1],[7]	Hyundai Energy Co., Ltd.	[1],[7]
Amount of guarantees	₩ 76,800	[1],[7]
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.
Name of Guarantee	Korea Development Bank and others		Korea Development Bank and others		Korea Development Bank and others
Name of Principal obligor	S-Power Co., Ltd.		S-Power Co., Ltd.		S-Power Co., Ltd.
Amount of guarantees	₩ 115,784
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.
Name of Guarantee	UniCredit Bulbank and others		UniCredit Bulbank and others		UniCredit Bulbank and others
Name of Principal obligor	RES Technology AD		RES Technology AD		RES Technology AD
Amount of guarantees	₩ 16,248
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.
Name of Guarantee	UniCredit Bulbank and others		UniCredit Bulbank and others		UniCredit Bulbank and others
Name of Principal obligor	ASM-BG Investicii AD		ASM-BG Investicii AD		ASM-BG Investicii AD
Amount of guarantees	₩ 19,376
Guarantees for supplemental funding
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea South-East Power Co., Ltd.	[1],[8]	Korea South-East Power Co., Ltd.	[1],[8]	Korea South-East Power Co., Ltd.	[1],[8]
Name of Guarantee	Woori Bank	[1],[8]	Woori Bank	[1],[8]	Woori Bank	[1],[8]
Name of Principal obligor	Expressway Solar-light Power Generation Co., Ltd.	[1],[8]	Expressway Solar-light Power Generation Co., Ltd.	[1],[8]	Expressway Solar-light Power Generation Co., Ltd.	[1],[8]
Amount of guarantees	₩ 2,500	[1],[8]
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.
Name of Guarantee	Kyobo Life Insurance Co., Ltd. and others		Kyobo Life Insurance Co., Ltd. and others		Kyobo Life Insurance Co., Ltd. and others
Name of Principal obligor	Goseong Green Energy Co., Ltd.		Goseong Green Energy Co., Ltd.		Goseong Green Energy Co., Ltd.
Amount of guarantees	₩ 2,340
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.
Name of Guarantee	Kyobo Life Insurance Co., Ltd. and others		Kyobo Life Insurance Co., Ltd. and others		Kyobo Life Insurance Co., Ltd. and others
Name of Principal obligor	Gangneung Eco Power Co., Ltd.		Gangneung Eco Power Co., Ltd.		Gangneung Eco Power Co., Ltd.
Amount of guarantees	₩ 2,430
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.
Name of Guarantee	IBK		IBK		IBK
Name of Principal obligor	PND solar., Ltd.		PND solar., Ltd.		PND solar., Ltd.
Amount of guarantees	₩ 1,144
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.
Name of Guarantee	Samsung Life Insurance and others		Samsung Life Insurance and others		Samsung Life Insurance and others
Name of Principal obligor	Hyundai Eco Energy Co., Ltd.		Hyundai Eco Energy Co., Ltd.		Hyundai Eco Energy Co., Ltd.
Amount of guarantees	₩ 3,781
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.
Name of Guarantee	IBK		IBK		IBK
Name of Principal obligor	Jaeun Resident Wind Power Plant Co., Ltd.		Jaeun Resident Wind Power Plant Co., Ltd.		Jaeun Resident Wind Power Plant Co., Ltd.
Amount of guarantees	₩ 2,198
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.
Name of Guarantee	Kyobo Life Insurance Co., Ltd. and others		Kyobo Life Insurance Co., Ltd. and others		Kyobo Life Insurance Co., Ltd. and others
Name of Principal obligor	Cheongsong Myeonbongsan Wind Power Plant Co., Ltd.		Cheongsong Myeonbongsan Wind Power Plant Co., Ltd.		Cheongsong Myeonbongsan Wind Power Plant Co., Ltd.
Amount of guarantees	₩ 2,764
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Hydro & Nuclear Power Co., Ltd.		Korea Hydro & Nuclear Power Co., Ltd.		Korea Hydro & Nuclear Power Co., Ltd.
Name of Guarantee	Hana Bank and others		Hana Bank and others		Hana Bank and others
Name of Principal obligor	Noeul Green Energy Co., Ltd.		Noeul Green Energy Co., Ltd.		Noeul Green Energy Co., Ltd.
Amount of guarantees	₩ 6,611
Guarantees for supplemental funding
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Hydro & Nuclear Power Co., Ltd.	[1]	Korea Hydro & Nuclear Power Co., Ltd.	[1]	Korea Hydro & Nuclear Power Co., Ltd.	[1]
Name of Guarantee	Hana Bank and others	[1]	Hana Bank and others	[1]	Hana Bank and others	[1]
Name of Principal obligor	Noeul Green Energy Co., Ltd.	[1]	Noeul Green Energy Co., Ltd.	[1]	Noeul Green Energy Co., Ltd.	[1]
Amount of guarantees	₩ 0	[1]
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Hydro & Nuclear Power Co., Ltd.		Korea Hydro & Nuclear Power Co., Ltd.		Korea Hydro & Nuclear Power Co., Ltd.
Name of Guarantee	Shinhan Bank and others		Shinhan Bank and others		Shinhan Bank and others
Name of Principal obligor	Busan Green Energy Co., Ltd.		Busan Green Energy Co., Ltd.		Busan Green Energy Co., Ltd.
Amount of guarantees	₩ 10,636
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Hydro & Nuclear Power Co., Ltd.		Korea Hydro & Nuclear Power Co., Ltd.		Korea Hydro & Nuclear Power Co., Ltd.
Name of Guarantee	Woori Bank and others		Woori Bank and others		Woori Bank and others
Name of Principal obligor	Cheong-Song Noraesan Wind Power Co., Ltd.		Cheong-Song Noraesan Wind Power Co., Ltd.		Cheong-Song Noraesan Wind Power Co., Ltd.
Amount of guarantees	₩ 3,044
Guarantees for supplemental funding
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Hydro & Nuclear Power Co., Ltd.	[1]	Korea Hydro & Nuclear Power Co., Ltd.	[1]	Korea Hydro & Nuclear Power Co., Ltd.	[1]
Name of Guarantee	Woori Bank and others	[1]	Woori Bank and others	[1]	Woori Bank and others	[1]
Name of Principal obligor	Cheong-Song Noraesan Wind Power Co., Ltd.	[1]	Cheong-Song Noraesan Wind Power Co., Ltd.	[1]	Cheong-Song Noraesan Wind Power Co., Ltd.	[1]
Amount of guarantees	₩ 0	[1]
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	KEPCO Plant Service & Engineering Co., Ltd.	[9]	KEPCO Plant Service & Engineering Co., Ltd.	[9]	KEPCO Plant Service & Engineering Co., Ltd.	[9]
Name of Guarantee	Shinhan Bank	[9]	Shinhan Bank	[9]	Shinhan Bank	[9]
Name of Principal obligor	Incheon New Power Co., Ltd.	[9]	Incheon New Power Co., Ltd.	[9]	Incheon New Power Co., Ltd.	[9]
Amount of guarantees	₩ 0	[9]
Guarantees for supplemental funding
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	KEPCO Plant Service & Engineering Co., Ltd.	[1]	KEPCO Plant Service & Engineering Co., Ltd.	[1]	KEPCO Plant Service & Engineering Co., Ltd.	[1]
Name of Guarantee	Shinhan Bank	[1]	Shinhan Bank	[1]	Shinhan Bank	[1]
Name of Principal obligor	Incheon New Power Co., Ltd.	[1]	Incheon New Power Co., Ltd.	[1]	Incheon New Power Co., Ltd.	[1]
Amount of guarantees	₩ 0	[1]
[1]	The Company guarantees to provide supplemental funding for business with respect to excessive business expenses or insufficient repayment of borrowings
[2]	The common stocks of Dongducheon Dream Power Co., Ltd. held by the Company were pledged as collateral.
[3]	This includes a guarantee for the shareholder's capital payment in connection with the business of 190MW gas complex thermal power plant in Jamaica. EWP Barbados 1 SRL's capital contribution amount is USD 18,400,000 and there is no residual guarantee amount among total collateral limit.
[4]	The Company provided a payment guarantee to Daehan Wind Power PSC for reimbursement of Equity Bridge Loan(EBL), opening LC for Debt Service Reserve Account(DSRA), guarantee for the swap termination costs and others.
[5]	Controlling and non-controlling common shareholders of Samcheok Eco Materials Co., Ltd. have pre-emption rights, if preferred shareholders intend to sell their shares until December 23, 2020. And promised yield of the preferred stock is guaranteed through the transaction. As of December 31, 2019, the Company has recognized derivative liabilities of KRW 6,205mllion related to the guarantee. Meanwhile, the Company is under an agreement with Samcheok Eco Materials Co., Ltd. that if a damage incurs related to the fulfillment of obligations pursuant to the mandatory contract of coal ash supply, compensation for the expected amount of the damage should be settled.
[6]	The Company recognized an impairment loss on all of the equity securities of Hyundai Energy Co., Ltd. in prior years, and the acquisition cost of the securities provided as collateral is W47,067 million.
[7]	Pursuant to the guarantee agreement, the Company recognized other provisions of W28,717 million as the possibility of economic benefit outflow to fulfill the obligation was deemed probable and the amount could be reasonably estimated.
[8]	The Company has granted the right to Hana Financial Investment Co., Ltd., as an agent for the creditors to Expressway Solar-light Power Generation Co., Ltd. ("ESPG"), to the effect that in the event of acceleration of ESPG's payment obligations under certain borrowings to such creditors, Hana Financial may demand the Company to dispose of shares in ESPG held by the Company and apply the resulting proceeds to repayment of ESPG's obligations.
[9]	The Company recognized an impairment loss on all of the equity securities of Incheon New Power Co., Ltd. during the year ended December 31,2019, and the acquisition cost of the securities provided as collateral is W461 million.

Derivatives transactions betwee

Derivatives transactions between related parties (Details) - 12 months ended Dec. 31, 2019 - Korea Development Bank SFr in Thousands, $ in Thousands, $ in Thousands, ₩ in Millions	KRW (₩)	USD ($)	CHF (SFr)	HKD ($)
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2019~2024	2019~2024	2019~2024	2019~2024
Pay, Contract Amount	₩ 177,600
Receive, Contract Amount | $		$ 150,000
Contract Interest rate Pay	1.24%	1.24%	1.24%	1.24%
Contract Interest rate Receive	2.50%	2.50%	2.50%	2.50%
Contract exchange rate	1,184	1,184	1,184	1,184
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2015~2025	2015~2025	2015~2025	2015~2025
Pay, Contract Amount	₩ 111,190
Receive, Contract Amount | $		$ 100,000
Contract Interest rate Pay	2.62%	2.62%	2.62%	2.62%
Contract Interest rate Receive	3.25%	3.25%	3.25%	3.25%
Contract exchange rate	1,111.90	1,111.90	1,111.90	1,111.90
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2017~2027	2017~2027	2017~2027	2017~2027
Pay, Contract Amount	₩ 111,610
Receive, Contract Amount | $		$ 100,000
Contract Interest rate Pay	2.31%	2.31%	2.31%	2.31%
Contract Interest rate Receive	3.13%	3.13%	3.13%	3.13%
Contract exchange rate	1,116.10	1,116.10	1,116.10	1,116.10
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2018~2028	2018~2028	2018~2028	2018~2028
Pay, Contract Amount	₩ 108,600
Receive, Contract Amount | $				$ 800,000
Contract Interest rate Pay	2.69%	2.69%	2.69%	2.69%
Contract Interest rate Receive	3.35%	3.35%	3.35%	3.35%
Contract exchange rate	135.75	135.75	135.75	135.75
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2018~2023	2018~2023	2018~2023	2018~2023
Pay, Contract Amount	₩ 170,280
Receive, Contract Amount | $		$ 150,000
Contract Interest rate Pay	2.15%	2.15%	2.15%	2.15%
Contract Interest rate Receive	3.75%	3.75%	3.75%	3.75%
Contract exchange rate	1,135.20	1,135.20	1,135.20	1,135.20
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2019~2027	2019~2027	2019~2027	2019~2027
Pay, Contract Amount	₩ 119,978
Receive, Contract Amount | SFr			SFr 100,000
Contract Interest rate Pay	1.43%	1.43%	1.43%	1.43%
Contract Interest rate Receive	0.05%	0.05%	0.05%	0.05%
Contract exchange rate	1,199.78	1,199.78	1,199.78	1,199.78
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2017~2020	2017~2020	2017~2020	2017~2020
Pay, Contract Amount	₩ 114,580
Receive, Contract Amount | $		$ 100,000
Contract Interest rate Pay	1.75%	1.75%	1.75%	1.75%
Contract Interest rate Receive	2.38%	2.38%	2.38%	2.38%
Contract exchange rate	1,145.80	1,145.80	1,145.80	1,145.80
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2016~2021	2016~2021	2016~2021	2016~2021
Pay, Contract Amount	₩ 121,000
Receive, Contract Amount | $		$ 100,000
Contract Interest rate Pay	2.15%	2.15%	2.15%	2.15%
Contract Interest rate Receive	2.50%	2.50%	2.50%	2.50%
Contract exchange rate	1,210	1,210	1,210	1,210
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2019~2022	2019~2022	2019~2022	2019~2022
Pay, Contract Amount	₩ 112,650
Receive, Contract Amount | $		$ 100,000
Contract Interest rate Pay	1.80%	1.80%	1.80%	1.80%
Contract Interest rate Receive	3.38%	3.38%	3.38%	3.38%
Contract exchange rate	1,126.50	1,126.50	1,126.50	1,126.50
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2018~2023	2018~2023	2018~2023	2018~2023
Pay, Contract Amount	₩ 320,880
Receive, Contract Amount | $		$ 300,000
Contract Interest rate Pay	2.03%	2.03%	2.03%	2.03%
Contract Interest rate Receive	3.75%	3.75%	3.75%	3.75%
Contract exchange rate	1,069.6	1,069.6	1,069.6	1,069.6
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2019~2022	2019~2022	2019~2022	2019~2022
Pay, Contract Amount	₩ 117,340
Receive, Contract Amount | $		$ 100,000
Contract Interest rate Pay	1.06%	1.06%	1.06%	1.06%
Contract Interest rate Receive	2.38%	2.38%	2.38%	2.38%
Contract exchange rate	1,173.40	1,173.40	1,173.40	1,173.40
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2018~2021	2018~2021	2018~2021	2018~2021
Pay, Contract Amount	₩ 212,960
Receive, Contract Amount | $		$ 200,000
Contract Interest rate Pay	2.10%	2.10%	2.10%	2.10%
Contract Interest rate Receive	3.00%	3.00%	3.00%	3.00%
Contract exchange rate	1,064.8	1,064.8	1,064.8	1,064.8
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2017~2022	2017~2022	2017~2022	2017~2022
Pay, Contract Amount	₩ 113,300
Receive, Contract Amount | $		$ 100,000
Contract Interest rate Pay	1.94%	1.94%	1.94%	1.94%
Contract Interest rate Receive	2.63%	2.63%	2.63%	2.63%
Contract exchange rate	1,133	1,133	1,133	1,133
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2018~2021	2018~2021	2018~2021	2018~2021
Pay, Contract Amount	₩ 169,335
Receive, Contract Amount | $		$ 150,000
Contract Interest rate Pay	2.26%	2.26%	2.26%	2.26%
Contract Interest rate Receive	3.88%	3.88%	3.88%	3.88%
Contract exchange rate	1,128.9	1,128.9	1,128.9	1,128.9
Cross Currency Forward Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Pay, Contract Amount	₩ 104,849
Receive, Contract Amount | $		$ 100,000
Contract exchange rate	1,048.49	1,048.49	1,048.49	1,048.49
Contract date	Dec. 27, 2017	Dec. 27, 2017	Dec. 27, 2017	Dec. 27, 2017
Matrurity date	Jul. 12, 2021	Jul. 12, 2021	Jul. 12, 2021	Jul. 12, 2021
Cross Currency Forward Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Pay, Contract Amount	₩ 11,925
Receive, Contract Amount | $		$ 10,000
Contract exchange rate	1,192.50	1,192.50	1,192.50	1,192.50
Contract date	Dec. 11, 2019	Dec. 11, 2019	Dec. 11, 2019	Dec. 11, 2019
Matrurity date	Jan. 15, 2020	Jan. 15, 2020	Jan. 15, 2020	Jan. 15, 2020
Cross Currency Forward Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Pay, Contract Amount	₩ 4,630
Receive, Contract Amount | $		$ 4,000
Contract exchange rate	1,157.40	1,157.40	1,157.40	1,157.40
Contract date	Dec. 30, 2019	Dec. 30, 2019	Dec. 30, 2019	Dec. 30, 2019
Matrurity date	Jan. 23, 2020	Jan. 23, 2020	Jan. 23, 2020	Jan. 23, 2020

Key management personnel compen

Key management personnel compensation (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of Key management personnel compensation [Abstract]
Salaries	₩ 1,315	₩ 1,106	₩ 1,271
Employee benefits	31	24	54
Total	₩ 1,346	₩ 1,130	₩ 1,325

Significant non-cash investing

Significant non-cash investing and financing transactions (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Non-Cash Transactions [Abstract]
Transfer from construction-in-progress to other assets	₩ 14,052,094	₩ 8,656,252	₩ 13,676,233
Recognition of asset retirement cost and related provision for decommissioning costs	2,425,668	310,272	2,494,802
Transfer from provision for disposal of spent nuclear fuel to accrued expenses	376,103	482,699	342,861
Transfer from long-term borrowings and debt securities to current portion of long-term borrowings and debt securities	7,759,284	7,100,846	0
Transfer of right-of-use assets due to change in accounting policy	₩ 5,364,647	₩ 0	₩ 0

Changes in liabilities arising

Changes in liabilities arising from financing activities (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure of reconciliation of liabilities arising from financing activities [Line Items]
Beginning balance	₩ 61,318,433	₩ 55,165,652
Cash flows	5,768,637	5,837,882
Disclosure - Changes in lease liabilities [Abstract]
Interest expense on lease liabilities	(85,950)
Increase	218,800	0
Changes in accounting policies	4,943,584	0
Effect of exchange rate fluctuations and others	694,320	314,899
Increase from the business combination	2,900	0
Ending balance	72,946,673	61,318,433
Borrowings and debt securities
Disclosure of reconciliation of liabilities arising from financing activities [Line Items]
Beginning balance	61,034,627	54,747,392
Cash flows	6,342,074	5,972,336
Disclosure - Changes in lease liabilities [Abstract]
Increase	0	0
Changes in accounting policies	0	0
Effect of exchange rate fluctuations and others	496,940	314,899
Increase from the business combination	2,900	0
Ending balance	67,876,540	61,034,627
Lease liabilities
Disclosure of reconciliation of liabilities arising from financing activities [Line Items]
Beginning balance	283,806	418,260
Cash flows	(573,437)	(134,454)
Disclosure - Changes in lease liabilities [Abstract]
Interest expense on lease liabilities	(85,950)
Decrease	659,387
Increase	218,800	0
Changes in accounting policies	4,943,584	0
Effect of exchange rate fluctuations and others	197,380	0
Increase from the business combination	0	0
Ending balance	₩ 5,070,133	₩ 283,806

Commitments for Expenditure (De

Commitments for Expenditure (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2019	Dec. 31, 2018
Purchase of cable (PVC,1C,2000SQ) 153,000M and others (Shin-Bupyung-Youngseo)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	₩ 56,408	₩ 56,183
Commitments for Expenditure balance	24,721	37,309
Purchase of cable (PVC, 1C, 2500SQ) 103,374M and others (Bukdangjin-Shintangjung)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	45,390	44,315
Commitments for Expenditure balance	32,876	31,801
Purchase of GIS (362KV 6300A 63KA) 23CB - YoungseoS/S
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	36,143	34,500
Commitments for Expenditure balance	36,143	34,500
Purchase of GIS (362kV, 6300A, 63kA) 26CB - Hwasung S/S
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	40,010	29,143
Commitments for Expenditure balance	15,300	18,194
Purchase of GIS (362KV 6300A 63KA) 27CB - KwangyangS/S
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	37,744	37,694
Commitments for Expenditure balance	9,700	10,491
Purchase of Concrete Poles (10M, 350KGF) 121,900 and 6 others
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	0	133,387
Commitments for Expenditure balance	0	13,343
Purchase of cable (TR CNCE-W/AL,1C,400SQ) 3,504,000M
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	66,240	66,240
Commitments for Expenditure balance	0	38,998
Purchase of cable (FR CNCO-W,1C,325SQ) 1,400,000
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	59,716	57,475
Commitments for Expenditure balance	37,249	48,598
Purchase of switch (Eco) 9,360 units
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	40,631	40,631
Commitments for Expenditure balance	24,031	34,797
Purchase of cable (TR CNCE-W/AL, 1C, 400SQ) 2,654,400M
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	36,063	0
Commitments for Expenditure balance	6,243	0
Construction of Shin-Kori units (#3,4)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	7,498,951	7,363,514
Commitments for Expenditure balance	0	3,211
Construction of Shin-Kori units (#5,6)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	8,625,387	8,625,387
Commitments for Expenditure balance	4,479,956	5,930,099
Construction of Shin-Hanul units (#1,2)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	8,306,149	7,982,342
Commitments for Expenditure balance	0	355,704
Other 27 contracts
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	352,710	269,681
Commitments for Expenditure balance	122,890	161,243
Service of designing Seoul Combined units (#1,2)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	30,778	29,996
Commitments for Expenditure balance	2,119	4,744
Purchase of main machine for construction of Seoul Combined units (#1,2)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	331,249	365,164
Commitments for Expenditure balance	15,918	51,165
Construction of Seoul Combined units (#1,2)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	387,722	285,890
Commitments for Expenditure balance	31,150	27,125
Purchase of smoke eliminating machine for construction of Shin-Boryeong units (#1,2)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	157,618	172,609
Commitments for Expenditure balance	0	13,986
Service of designing Shin-Boryeong units (#1,2)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	120,668	120,199
Commitments for Expenditure balance	888	1,076
Purchase of main machine for construction of Shin-Boryeong units (#1,2)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	816,317	866,065
Commitments for Expenditure balance	4,955	4,981
Purchase of furnace for construction of Shin-Seocheon thermal power plant
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	305,209	305,209
Commitments for Expenditure balance	43,388	74,631
Purchase of turbine generator for construction of Shin-Seocheon thermal power plant
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	105,226	104,402
Commitments for Expenditure balance	10,736	57,968
Electricity construction of Shin-Seocheon thermal power plant
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	231,196	217,848
Commitments for Expenditure balance	87,874	174,122
Purchase of main machine for Jeju LNG combined
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	166,287	166,287
Commitments for Expenditure balance	12,088	11,272
Purchase of coal handling machine for construction of Taean (#9,10) and IGCC units (conditional contract for installation)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	205,764	205,764
Commitments for Expenditure balance	282	282
Purchase of furnace for construction of Taean units (#9,10)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	556,206	556,504
Commitments for Expenditure balance	17,579	18,502
Service of designing Taean units (#9,10)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	112,483	112,344
Commitments for Expenditure balance	12,862	13,338
Purchase of turbine generator for construction of Taean units (#9,10)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	214,208	214,462
Commitments for Expenditure balance	10,857	10,422
Purchase of oxygen plant for construction of Taean IGCC units
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	97,345	96,068
Commitments for Expenditure balance	1,630	1,552
Purchase of gas turbine and turbine equipment of Gimpo combined heat & power plant
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	104,600	0
Commitments for Expenditure balance	104,600	0
Service of designing Taean IGCC plant units
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	46,101	46,001
Commitments for Expenditure balance	2,332	3,161
Purchase of furnace for construction of Samcheok units (#1,2)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	1,066,824	1,092,287
Commitments for Expenditure balance	11,771	12,215
Purchase of coal handling machine for construction of Samcheok units (#1,2)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	282,927	307,925
Commitments for Expenditure balance	42,785	48,736
Purchase of turbine main equipment for Samcheok units (#1,2)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	223,550	212,188
Commitments for Expenditure balance	132	348
Purchase of main equipment for Namjeju
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	138,486	146,594
Commitments for Expenditure balance	₩ 84,982	₩ 134,949

Contracts for inventory purchas

Contracts for inventory purchase commitment (Details)	12 Months Ended
	Dec. 31, 2019
Concentrate
Disclosure of contracts for inventory purchase commitment [Line Items]
Periods	2019 ~ 2030
Contracted amounts	38,990 Ton U3O8
Transformed
Disclosure of contracts for inventory purchase commitment [Line Items]
Periods	2019 ~ 2030
Contracted amounts	21,969 Ton U
Enrichment
Disclosure of contracts for inventory purchase commitment [Line Items]
Periods	2019 ~ 2030
Contracted amounts	17,060 Ton SWU
Molded (Light)
Disclosure of contracts for inventory purchase commitment [Line Items]
Periods	2019 ~ 2020
Contracted amounts	756 Ton U
Molded (Medium)
Disclosure of contracts for inventory purchase commitment [Line Items]
Periods	2019 ~ 2020
Contracted amounts	401 Ton U
Molded (Initial core)
Disclosure of contracts for inventory purchase commitment [Line Items]
Periods	2019 ~ 2022
Contracted amounts	415 Ton U

Litigation Case (Details)

Litigation Case (Details) ₩ in Millions	Dec. 31, 2019KRW (₩)₩ / shares	Dec. 31, 2018KRW (₩)₩ / shares
As the defendant
Litigation Case [Line Items]
Number of cases | ₩ / shares	586	570
Claim amount | ₩	₩ 697,835	₩ 673,882
As the plaintiff
Litigation Case [Line Items]
Number of cases | ₩ / shares	199	174
Claim amount | ₩	₩ 707,287	₩ 793,491

Commitments and Contingencies D

Commitments and Contingencies Disclosure (Details) - 12 months ended Dec. 31, 2019 ₱ in Thousands, € in Thousands, ₨ in Thousands, ر.ق in Thousands, ر.س in Thousands, د.إ in Thousands, ¥ in Thousands, RM in Thousands, R in Thousands, $ in Thousands, $ in Thousands, ₩ in Millions

KRW (₩)

USD ($)

EUR (€)

PHP (₱)

SAR (ر.س)

MYR (RM)

JPY (¥)

INR (₨)

CAD ($)

ZAR (R)

QAR (ر.ق)

AED (د.إ)

Commitments on bank-overdraft

Commitments and Contingencies Disclosure [Line Items]

Financial institutions

Nonghyup Bank and others

Limited amount | ₩

₩ 1,825,500

Exercised amount | ₩

₩ 373,219

Commitments on bank-daylight overdraft

Commitments and Contingencies Disclosure [Line Items]

Financial institutions

Nonghyup Bank and others

Limited amount | ₩

₩ 280,000

Exercised amount | ₩

₩ 0

Limit amount available for CP

Commitments and Contingencies Disclosure [Line Items]

Financial institutions

Hana Bank and others

Limited amount | ₩

₩ 1,250,000

Exercised amount | ₩

₩ 1,150,000

Limit amount available for card

Commitments and Contingencies Disclosure [Line Items]

Financial institutions

Hana Bank and others

Limited amount | ₩

₩ 51,904

Exercised amount | ₩

₩ 6,686

Limit amount available for card

Commitments and Contingencies Disclosure [Line Items]

Financial institutions

Banco de Oro

Limited amount | ₱

₱ 5,000

Exercised amount | ₱

₱ 3,000

Loan limit

Commitments and Contingencies Disclosure [Line Items]

Financial institutions

Kookmin Bank and others

Limited amount | ₩

₩ 1,050,503

Exercised amount | ₩

₩ 685,429

Loan limit

Commitments and Contingencies Disclosure [Line Items]

Financial institutions

DBS Bank and others

Limited amount | $

$ 2,492,700

Exercised amount | $

14,400

Certification of payment on payables from foreign country

Commitments and Contingencies Disclosure [Line Items]

Financial institutions

Nonghyup Bank

Limited amount | $

4,680

Exercised amount | $

3,892

Certification of payment on L/C

Commitments and Contingencies Disclosure [Line Items]

Financial institutions

Shinhan Bank

Limited amount | ₩

₩ 7,749

Exercised amount | ₩

₩ 0

Certification of payment on L/C

Commitments and Contingencies Disclosure [Line Items]

Financial institutions

Shinhan Bank and others

Limited amount | $

1,051,334

Exercised amount | $

171,975

Certification of payment on L/C

Commitments and Contingencies Disclosure [Line Items]

Financial institutions

Societe Generale

Limited amount | RM

RM 2,500

Exercised amount | RM

RM 2,500

Certification of performance guarantee on contract

Commitments and Contingencies Disclosure [Line Items]

Financial institutions

Seoul Guarantee Insurance and others

Limited amount | ₩

₩ 84,011

Exercised amount | ₩

₩ 66,892

Certification of performance guarantee on contract

Commitments and Contingencies Disclosure [Line Items]

Financial institutions

First Abu Dhabi Bank and others

Limited amount | $

596,862

Exercised amount | $

465,093

Certification of performance guarantee on contract

Commitments and Contingencies Disclosure [Line Items]

Financial institutions

Korea Development Bank and others

Limited amount | ¥

¥ 637,495

Exercised amount | ¥

637,495

Certification of performance guarantee on contract

Commitments and Contingencies Disclosure [Line Items]

Financial institutions

Hana Bank and others

Limited amount | €

€ 4,158

Exercised amount | €

€ 4,158

Certification of performance guarantee on contract

Commitments and Contingencies Disclosure [Line Items]

Financial institutions

Hana Bank and others

Limited amount | ₨

₨ 191,883

Exercised amount | ₨

191,883

Certification of performance guarantee on contract

Commitments and Contingencies Disclosure [Line Items]

Financial institutions

Hana Bank

Limited amount | $

$ 464

Exercised amount | $

$ 464

Certification of performance guarantee on contract

Commitments and Contingencies Disclosure [Line Items]

Financial institutions

Shinhan Bank

Limited amount | R

R 55,730

Exercised amount | R

R 55,730

Certification of bidding

Commitments and Contingencies Disclosure [Line Items]

Financial institutions

Hana Bank

Limited amount | $

10,000

Exercised amount | $

197

Advance payment bond, Warranty bond, Retention bond and others

Commitments and Contingencies Disclosure [Line Items]

Financial institutions

Seoul Guarantee Insurance

Limited amount | ₩

₩ 44,047

Exercised amount | ₩

₩ 44,047

Advance payment bond, Warranty bond, Retention bond and others

Commitments and Contingencies Disclosure [Line Items]

Financial institutions

Export-Import Bank of Korea and others

Limited amount | $

714,654

Exercised amount | $

649,402

Advance payment bond, Warranty bond, Retention bond and others3 [Member]

Commitments and Contingencies Disclosure [Line Items]

Financial institutions

Hana Bank

Limited amount | ر.س

ر.س 86,508

Exercised amount | ر.س

ر.س 86,508

Advance payment bond, Warranty bond, Retention bond and others4 [Member]

Commitments and Contingencies Disclosure [Line Items]

Financial institutions

SMBC Bank

Limited amount | ر.ق

ر.ق 15,000

Exercised amount | ر.ق

ر.ق 15,000

Other commitments

Commitments and Contingencies Disclosure [Line Items]

Financial institutions

Nonghyup Bank and others

Limited amount | ₩

₩ 537,064

Exercised amount | ₩

₩ 47,638

Other commitments

Commitments and Contingencies Disclosure [Line Items]

Financial institutions

Export-Import Bank of Korea and others

Limited amount | $

1,562,194

Exercised amount | $

1,315,378

Other commitments

Commitments and Contingencies Disclosure [Line Items]

Financial institutions

Shinhan Bank

Limited amount | ¥

381,210

Exercised amount | ¥

¥ 381,210

Other commitments

Commitments and Contingencies Disclosure [Line Items]

Financial institutions

Standard Chartered

Limited amount | د.إ

د.إ 50

Exercised amount | د.إ

د.إ 50

Inclusive credit

Commitments and Contingencies Disclosure [Line Items]

Financial institutions

Hana Bank

Limited amount | ₩

₩ 8,000

Exercised amount | ₩

₩ 772

Inclusive credit

Commitments and Contingencies Disclosure [Line Items]

Financial institutions

Hana Bank and others

Limited amount | $

30,975

Exercised amount | $

17,502

Inclusive credit

Commitments and Contingencies Disclosure [Line Items]

Financial institutions

Shinhan Bank

Limited amount | ₨

92,348

Exercised amount | ₨

₨ 92,348

Trade finance

Commitments and Contingencies Disclosure [Line Items]

Financial institutions

BNP Paribas and others

Limited amount | $

700,000

Exercised amount | $

$ 0

Assets pledged as collateral (D

Assets pledged as collateral (Details) - 12 months ended Dec. 31, 2019 JD in Thousands, $ in Thousands, ₩ in Millions		KRW (₩)	USD ($)	JOD (JD)
Land, buildings, structures and machinery and others
Disclsoure of assets pledged as collateral [Line Items]
Name of Guarantor		Commerce and Industry Energy Co., Ltd.
Name of Guarantee		IBK and others
Value of collateral		₩ 110,500
Description of assets pledged as collateral description	[1]	Collateral for borrowings
Property, plant and equipment and others
Disclsoure of assets pledged as collateral [Line Items]
Name of Guarantor		Mira Power Limited
Name of Guarantee		International Finance Corporation and others
Value of collateral | $			$ 275,600
Description of assets pledged as collateral description	[2]	Collateral for borrowings
Property, plant and equipment and others
Disclsoure of assets pledged as collateral [Line Items]
Name of Guarantor		Tamra Offshore Wind Power Co., Ltd.
Name of Guarantee		Kyobo Life Insurance Co., Ltd. and others
Value of collateral		₩ 171,600
Description of assets pledged as collateral description	[2]	Collateral for borrowings
Property, plant and equipment and others
Disclsoure of assets pledged as collateral [Line Items]
Name of Guarantor		SE Green Energy Co., Ltd.
Name of Guarantee		DB Insurance Co., Ltd. and others
Value of collateral		₩ 149,500
Description of assets pledged as collateral description	[2]	Collateral for borrowings
Cash and Cash Equivalents
Disclsoure of assets pledged as collateral [Line Items]
Name of Guarantor		Gyeonggi Green Energy Co., Ltd.
Name of Guarantee		Korea Development Bank and others
Value of collateral		₩ 327,080
Description of assets pledged as collateral description	[2]	Collateral for borrowings
Cash and cash equivalents
Disclsoure of assets pledged as collateral [Line Items]
Name of Guarantor		KOSPO Youngnam Power Co., Ltd.
Name of Guarantee		Shinhan Bank and others
Value of collateral		₩ 396,120
Description of assets pledged as collateral description	[2]	Collateral for borrowings
Property, plant and equipment and others
Disclsoure of assets pledged as collateral [Line Items]
Name of Guarantor		Gyeongju Wind Power Co., Ltd.
Name of Guarantee		Samsung Fire & Marine Insurance Co., Ltd. And others
Value of collateral		₩ 110,240
Description of assets pledged as collateral description	[2]	Collateral for borrowings
Utility plant and others
Disclsoure of assets pledged as collateral [Line Items]
Name of Guarantor		Korea Offshore Wind Power Co., Ltd
Name of Guarantee		Woori Bank and others
Value of collateral		₩ 293,400
Description of assets pledged as collateral description	[2]	Collateral for borrowings
Finance Lease receivable and property, plant and equipment and others
Disclsoure of assets pledged as collateral [Line Items]
Name of Guarantor		Qatrana Electric Power Company
Name of Guarantee		The Islamic Development Bank and others
Value of collateral | JD				JD 236,570
Description of assets pledged as collateral description	[1]	Collateral for borrowings
Finance Lease receivable and property, plant and equipment and others
Disclsoure of assets pledged as collateral [Line Items]
Name of Guarantor		KST Electric Power Company
Name of Guarantee		The Export - Import Bank of Korea and others
Value of collateral | $			$ 401,277
Description of assets pledged as collateral description	[1]	Collateral for debt securities
[1]	This is based on the amount of loan commitment limit.
[2]	As of December 31, 2019, the Company has established guarantees for pledge for transfer of rights of long-term borrowings, pledge for insurance claims, pledge for shares, etc.

Disclosure of detailed informat

Disclosure of detailed information about business combination (Details) ₩ in Millions	12 Months Ended
	Dec. 31, 2019KRW (₩)
Acquisition-date fair value of total consideration transferred [Abstract]
Cash and cash equivalents	₩ 156,700
Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [Abstract]
Cash and cash equivalents	₩ 2,389
Business combinations [Member]
Disclosure of detailed information about business combination [Line Items]
Company	Eumseong Natural Gas Power Co., Ltd.
Key operation activities	Power generation
Date of merger	Dec. 23, 2019
Percentage of voting equity interests acquired	100.00%
Description of how acquirer obtained control of acquiree	Eumseong Natural Gas Power Co., Ltd. was established in August 2019 by spin-off from Dangjin Eco Power Co., Ltd., and obtained the license for LNG combined power generation under the 8th Basic Plan for Long-Term Electricity Supply and Demand. Korea East-West Power Co., Ltd., a subsidiary of the Company, acquired 100% of its interest in Eumseong Natural Gas Power Co., Ltd. for stable power supply and profit generation through diversification of power sources, and merged with Eumseong Natural Gas Power Co., Ltd. on December 23, 2019.
Description of valuation techniques and significant inputs used to measure non-controlling interest in acquiree measured at fair value	Goodwill arose from the business combination due to the transfer price including the premium to obtain control paid in order to acquire Eumseong Natural Gas Power Co., Ltd. It also includes expectation of synergy effect and future growth in profits derived from business combination with LNG combined power generation project. These business rights can be separated from goodwill which satisfies the recognition requirements and thus the business rights have been recognized as a separate intangible asset. On the contrary, the expected benefits such as direct fuel acquisition and reduce costs for O&M did not satisfy the recognition requirements for identifiable intangible assets and thus were not recognized separately from the goodwill.
Description of line item of statement of comprehensive income in which gain or loss as result of remeasuring to fair value equity interest is recognised	There is no sale or net profit included in the statement of comprehensive income (loss) for the year ended December 31,2019, in relation to additional business launched by Eumseong Natural Gas Power Co., Ltd.
Acquisition-date fair value of total consideration transferred [Abstract]
Cash and cash equivalents	₩ 156,700
Other trade payables	10,000
Fair value of the shares owned before the acquisition	59,058
Fair value of transfer price	225,758
Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [Abstract]
Cash and cash equivalents	2,389
Trade and other receivables	55
Property, plant and equipment	54
Intangible assets	172,434
Other assets	60
Borrowings	(2,900)
Deferred tax liabilities	(41,729)
Less : Fair value of the identifiable net assets	130,363
Goodwill recognised as of acquisition date	₩ 95,395

Disclosure of Net cash outflows

Disclosure of Net cash outflows from the business combination (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of Net cash outflows from the business combination [Abstract]
Cash paid for the acquisition	₩ 156,700
Less : Cash and cash equivalents received	(2,389)
Net cash outflows from the business combination	₩ 154,311	₩ 0	₩ 0

Disclosure of transactions reco

Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination (Details) - Business combinations [Member] ₩ in Millions	12 Months Ended
	Dec. 31, 2019KRW (₩)
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [Line Items]
Description of transaction recognised separately from acquisition of assets and assumption of liabilities in business combination	Fees for legal service, due diligence and others relating to the business combination amounted to KRW24 million. The fees were excluded from the transfer price and recognized as selling and administrative expenses in the statement of comprehensive income (loss) for the year ended December 31, 2019.
Acquisition-related costs for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination	₩ 24

Subsequent Events (Details)

Subsequent Events (Details) $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2019KRW (₩)	Dec. 31, 2019USD ($)
Foreign bond
Subsequent Events - Issuance of bonds [Line Items]
company name	Korea South-East Power Co., Ltd.
Issue date	Feb. 3, 2020
Maturity	Feb. 3, 2025
Interest rate (%)	2.13%	2.13%
Amounts issued for the subsequent period | $		$ 300,000
#54-1 non-guaranteed corporate bond
Subsequent Events - Issuance of bonds [Line Items]
company name	Korea Midland Power Co., Ltd.
Issue date	Feb. 25, 2020
Maturity	Feb. 25, 2040
Interest rate (%)	1.53%	1.53%
Amounts issued for the subsequent period	₩ 50,000
#54-2 non-guaranteed corporate bond
Subsequent Events - Issuance of bonds [Line Items]
company name	Korea Midland Power Co., Ltd.
Issue date	Feb. 25, 2020
Maturity	Feb. 25, 2050
Interest rate (%)	1.53%	1.53%
Amounts issued for the subsequent period	₩ 120,000
#55 non-guaranteed corporate bond
Subsequent Events - Issuance of bonds [Line Items]
company name	Korea Hydro & Nuclear Power Co., Ltd.
Issue date	Mar. 18, 2020
Maturity	Mar. 18, 2040
Interest rate (%)	1.59%	1.59%
Amounts issued for the subsequent period	₩ 80,000
#55-1 non-guaranteed corporate bond
Subsequent Events - Issuance of bonds [Line Items]
company name	Korea Hydro & Nuclear Power Co., Ltd.
Issue date	Apr. 2, 2020
Maturity	Apr. 2, 2040
Interest rate (%)	1.80%	1.80%
Amounts issued for the subsequent period	₩ 50,000
#55-2 non-guaranteed corporate bond
Subsequent Events - Issuance of bonds [Line Items]
company name	Korea Hydro & Nuclear Power Co., Ltd.
Issue date	Apr. 2, 2020
Maturity	Apr. 2, 2050
Interest rate (%)	1.80%	1.80%
Amounts issued for the subsequent period	₩ 50,000
Foreign short-term borrowing 1
Subsequent Events - Issuance of bonds [Line Items]
company name	Korea Western Power Co., Ltd.
Issue date	Feb. 6, 2020
Maturity	May 6, 2020
Interest rate (%)	1.97%	1.97%
Amounts issued for the subsequent period | $		$ 24,658
Foreign short-term borrowing 2
Subsequent Events - Issuance of bonds [Line Items]
company name	Korea Western Power Co., Ltd.
Issue date	Feb. 6, 2020
Maturity	May 26, 2020
Interest rate (%)	1.86%	1.86%
Amounts issued for the subsequent period | $		$ 7,329