Korea Electric Power (KEP) 20-F 30 Apr 19 2018 FY Annual report (foreign) Financial data

Document And Entity Information

Document And Entity Information	12 Months Ended
	Dec. 31, 2018shares
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, 2018
Amendment flag	false
Document fiscal year focus	2018
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

Consolidated Statements Of Fina

Consolidated Statements Of Financial Position - KRW (₩) ₩ in Millions		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents (Notes 5,6,7 and 48)		₩ 1,358,345	₩ 2,369,739	₩ 3,051,353
Current financial assets, net (Notes 5,9,12,13,14,15 and 48)		2,359,895	1,958,357
Trade and other receivables, net (Notes 5,8,17,23,48,49 and 50)		7,793,592	7,928,972
Inventories, net (Notes 16)		7,188,253	6,002,086
Income tax refund receivables (Notes 44)		143,214	100,590
Current non-financial assets (Notes 18)		878,888	753,992
Assets held for sale (Notes 45)		22,881	27,971
Total current assets		19,745,068	19,141,707
Non-current assets
Non-current financial assets, net (Notes 5,6,9,10,11,12,13,14,15 and 48)		2,113,613	2,038,913
Non-current trade and other receivables, net (Notes 5,8,17,48,49 and 50)		1,819,845	1,754,797
Property, plant and equipment, net (Notes 21,30 and 52)		152,743,194	150,882,414	145,743,056
Investment properties, net (Notes 22 and 30)		159,559	284,714	353,680
Goodwill (Notes 19)		2,582	2,582
Intangible assets other than goodwill, net (Notes 24,30 and 49)		1,225,942	1,187,121
Investments in associates (Notes 4 and 20)		4,064,820	3,837,421
Investments in joint ventures (Notes 4 and 20)		1,813,525	1,493,275
Deferred tax assets (Notes 44)		1,233,761	919,153
Non-current non-financial assets (Notes 18)		327,152	246,818
Total non-current assets		165,503,993	162,647,208
Total Assets (Notes 4)		185,249,061	181,788,915	177,837,042
Current liabilities
Trade and other payables, net (Note 5,25,27,48 and 50)		6,405,395	5,999,521
Current financial liabilities, net (Note 5,14,26,48 and 50)		7,981,879	9,194,552
Income tax payables (Note 44)		285,420	508,402
Current non-financial liabilities (Note 23,31 and 32)		5,574,041	5,584,308
Current provisions (Note 29 and 48)		1,594,798	2,137,498
Total current liabilities		21,841,533	23,424,281
Non-current liabilities
Non-current trade and other payables, net (Note 5,25,27,48 and 50)		2,941,696	3,223,480
Non-current financial liabilities, net (Note 5,14,26,48 and 50)		53,364,911	45,980,899
Non-current non-financial liabilities (Note 31 and 32)		8,160,033	8,072,434
Employee benefits liabilities, net (Note 28 and 48)		1,645,069	1,483,069
Deferred tax liabilities (Note 44)		9,617,309	10,415,397
Non-current provisions (Note 29 and 48)		16,585,748	16,224,714
Total non-current liabilities		92,314,766	85,399,993
Total liabilities (Note 4)		114,156,299	108,824,274	104,786,497
Equity
Contributed capital (Note 1,33 and 48)		4,053,578	4,053,578
Share capital		3,209,820	3,209,820
Share premium		843,758	843,758
Retained earnings (Note 34)		51,519,119	53,370,558	53,173,871
Legal reserves	[1]	1,604,910	1,604,910
Voluntary reserves		35,906,267	34,833,844
Unappropriated retained earnings		14,007,942	16,931,804
Other components of equity (Note 37)		14,171,228	14,257,309	14,496,244
Other capital surplus		1,234,825	1,233,793
Accumulated other comprehensive loss		(358,570)	(271,457)
Other equity		13,294,973	13,294,973
Equity attributable to owners of the controlling company		69,743,925	71,681,445
Non-controlling interests (Note 19 and 36)		1,348,837	1,283,196
Total equity		71,092,762	72,964,641	₩ 73,050,545
Total equity and liabilities		₩ 185,249,061	₩ 181,788,915
[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, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of comprehensive income [Abstract]
Sales (Notes 4,38,48 and 50)	₩ 60,033,062	₩ 59,335,889	₩ 59,763,087
Sales of goods	57,897,804	55,772,548	55,379,487
Sales of construction services (Note 23)	1,742,391	3,212,184	4,026,857
Sales of services	392,867	351,157	356,743
Cost of sales (Notes 16,28,46 and 50)	(58,207,721)	(52,098,855)	(45,549,553)
Cost of sales of goods	(55,976,628)	(48,454,036)	(41,237,372)
Cost of sales of construction services	(1,638,869)	(3,047,396)	(3,755,144)
Cost of sales of services	(592,224)	(597,423)	(557,037)
Gross profit	1,825,341	7,237,034	14,213,534
Selling and administrative expenses (Note 28,39,46 and 50)	(2,627,890)	(2,762,855)	(2,639,232)
Other income (Note 40)	969,894	869,118	840,184
Other expenses (Note 40)	(231,330)	(180,055)	(188,624)
Other gains (losses), net (Note 41)	(621,124)	156,627	70,498
Operating profit (loss) (Note 4)	(685,109)	5,319,869	12,296,360
Finance income (Note 5,14 and 42)	796,870	1,530,618	791,543
Finance expenses (Note 5,14 and 43)	(2,470,743)	(3,127,952)	(2,437,087)
Profit (loss) related to associates, joint ventures and subsidiaries (Note 4 and 20)	358,163	(108,317)	(137,348)
Share in profit of associates and joint ventures	473,269	241,537	224,435
Gain on disposal of investments in associates and joint ventures	5,079	609	52
Gain on disposal of investments in subsidiaries (Note 16)	73	0	0
Share in loss of associates and joint ventures	(110,168)	(323,225)	(243,361)
Loss on disposal of investments in associates and joint ventures	(2,183)	0	(2,935)
Impairment loss on investments in associates and joint ventures (Note 20)	(7,907)	(27,238)	(115,539)
Profit (loss) before income tax	(2,000,819)	3,614,218	10,513,468
Income tax benefit (expense) (Note 44)	826,321	(2,172,824)	(3,365,141)
Profit (loss) for the period	(1,174,498)	1,441,394	7,148,327
Other comprehensive income (loss) (Note 5,14,28,34 and 37)	(106,925)	(94,716)	(2,302)
Items that will not be reclassified subsequently to profit or loss:
Remeasurements of defined benefit liability, net of tax (Note 28 and 34)	(108,169)	170,337	(75,926)
Share in other comprehensive loss of associates and joint ventures, net of tax (Note 34)	(1,153)	10,067	(2,515)
Net change in fair value of equity Investments at fair value through other comprehensive loss (Note 37)	(34,185)
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 37)		(7,098)	61,279
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax (Note 5,14 and 37)	211	20,868	28,414
Foreign currency translation of foreign operations, net of tax (Note 37)	(20,717)	(134,196)	41,360
Share in other comprehensive income (loss) of associates and joint ventures, net of tax (Note 37)	57,088	(154,694)	(54,914)
Total comprehensive income (loss) for the period	(1,281,423)	1,346,678	7,146,025
Profit or loss attributable to:
Owners of the controlling company (Note 47)	(1,314,567)	1,298,720	7,048,581
Non-controlling interests	140,069	142,674	99,746
Profit (loss) for the period	(1,174,498)	1,441,394	7,148,327
Total comprehensive income (loss) attributable to:
Owners of the controlling company	(1,426,477)	1,230,194	7,041,557
Non-controlling interests	145,054	116,484	104,468
Other comprehensive income (loss)	₩ (1,281,423)	₩ 1,346,678	₩ 7,146,025
Earnings (loss) per share (in won) (Note 47)
Basic and diluted earnings per share	₩ (2,048)	₩ 2,023	₩ 10,980

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, 2015	₩ 67,942,475	₩ 66,634,467	₩ 4,053,578	₩ 48,187,241	₩ 14,393,648	₩ 1,308,008
Comprehensive income
Profit (loss) for the period	7,148,327	7,048,581	0	7,048,581	0	99,746
Items that will not be reclassified subsequently to profit or loss:
Remeasurements of defined benefit liability, net of tax	(75,926)	(69,330)	0	(69,330)	0	(6,596)
Share in other comprehensive income (loss) of associates and joint ventures, net of tax	(2,515)	(2,532)	0	(2,532)	0	17
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	61,279	61,275	0	0	61,275	4
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax	28,414	27,075	0	0	27,075	1,339
Foreign currency translation of foreign operations, net of tax	41,360	31,406	0	0	31,406	9,954
Share in other comprehensive income (loss) of associates and joint ventures, net of tax	(54,914)	(54,918)	0	0	(54,918)	4
Dividends paid	(2,090,071)	(1,990,089)	0	(1,990,089)	0	(99,982)
Issuance of share capital by subsidiaries	16,559	1,750	0	0	1,750	14,809
Equity transaction within consolidation scope - other than issuance of share capital	48,307	36,008	0	0	36,008	12,299
Changes in consolidation scope	3,705	0	0	0	0	3,705
Dividends paid (hybrid bond)	(16,455)	0	0	0	0	(16,455)
Other changes in equity						0
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
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 share 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 securities	(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 equity investments 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 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 share 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)
Other changes in equity	0
Balance at Dec. 31, 2018	₩ 71,092,762	₩ 69,743,925	₩ 4,053,578	₩ 51,519,119	₩ 14,171,228	₩ 1,348,837

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018		Dec. 31, 2017	Dec. 31, 2016
Cash flows from (used in) operating activities
Profit (loss) for the period	₩ (1,174,498)		₩ 1,441,394	₩ 7,148,327
Adjustments for:
Income Tax expense (benefit)	(826,321)		2,172,824	3,365,141
Depreciation	9,905,856		9,660,039	8,881,273
Amortisation	118,938		113,672	79,715
Employee benefits expense	360,575		391,360	373,753
Bad debt expense	57,468		126,326	37,815
Interest expense	1,868,458		1,789,552	1,752,868
Losses on sale of financial assets	1		2,343	9
Losses on disposals of property, plant and equipment	60,704		70,514	4,996
Loss on abandonment of property, plant, and equipment	481,176		424,091	426,519
Impairment loss on property, plant and equipment	710,162		51,067	0
Impairment loss on intangible assets	8,112	[1]	20	3,945
Losses on disposal of intangible assets	43		183	158
Increase to provisions	1,056,994		1,690,120	1,782,732
Loss (gain) on foreign currency translation, net	243,378		(902,878)	253,468
Gain on valuation of financial assets at fair value through profit or loss	(8,495)		0	0
Loss on valuation of financial assets at fair value through profit or loss	6,616		0	0
Valuation and transaction loss (gain) on derivative instruments, net	(300,500)		1,043,628	(231,630)
Share in loss (income) of associates and joint ventures, net	(363,101)		81,688	18,926
Gains on disposal of financial assets	(1,838)		(1,130)	(1,482)
Gains on disposal of property plant, and equipment	(98,077)		(48,316)	(74,035)
Gains on disposal of intangible assets	(12)		(564)	0
Gain on disposal of investments in associates and joint ventures	(5,079)		(609)	(52)
Loss on disposal of investments in associates and joint ventures	2,183		0	2,935
Impairment loss on investments in associates and joint ventures	7,907		27,238	115,539
Gain on disposal of investments in subsidiaries	(72)		0	0
Interest income	(223,767)		(206,143)	(241,778)
Dividends income	(12,777)		(11,477)	(9,446)
Impairment loss on available-for-sale financial assets	0		2,713	86,703
Other inflows (outflows) of cash	81,317		16,679	66,260
Adjustments for Cash flows from operating activities	13,129,849		16,492,940	16,694,332
Changes in:
Trade receivables	246,755		(218,328)	200,529
Non-trade receivables	154,580		(31,807)	(68,322)
Accrued income	(484,718)		577,838	69,151
Other receivables	(61,961)		(1,271)	10,093
Other current assets	(148,509)		37,576	(259,492)
Inventories	(1,771,550)		(1,373,438)	(1,439,545)
Other non-current assets	(54,148)		(46,079)	(2,792)
Trade payables	478,744		342,126	141,994
Non-trade payables	(292,912)		(214,704)	(8,379)
Accrued expenses	(361,204)		(715,305)	(153,172)
Other payables	0		292	0
Other current liabilities	250,112		(126,323)	284,417
Other non-current liabilities	287,488		763,958	809,699
Investments in associates and joint ventures (dividends received)	175,175		106,983	75,407
Provisions	(1,132,969)		(1,390,606)	(1,527,129)
Payments of employee benefit obligations	(89,253)		(69,489)	(53,477)
Plan assets	(330,064)		(325,080)	(312,125)
Changes in assets and liabilities Cash flows from operating activities	(3,134,434)		(2,683,657)	(2,233,143)
Cash generated from operating activities	8,820,917		15,250,677	21,609,516
Dividends received (available-for-sale financial assets)	11,182		10,590	10,294
Interest paid	(1,895,898)		(1,886,303)	(2,041,379)
Interest received	194,221		173,226	240,878
Income taxes paid	(450,290)		(2,298,296)	(3,298,757)
Net cash flows from operating activities	6,680,132		11,249,894	16,520,552
Cash flows from investing activities
Proceeds from disposals of associates and joint ventures	1,617		10,542	46,644
Acquisition of associates and joint ventures	(319,425)		(206,753)	(113,222)
Proceeds from sales of property, plant and equipment	234,138		85,801	207,960
Acquisition of property, plant and equipment	(12,266,870)		(12,535,958)	(12,028,789)
Proceeds from sales of intangible assets	13		1,072	430
Acquisition of intangible assets	(110,587)		(143,887)	(124,422)
Proceeds from disposals of financial assets	2,419,259		5,296,680	10,876,017
Acquisition of financial assets	(2,841,651)		(4,786,717)	(8,130,621)
Increase in loans	(188,675)		(218,698)	(206,092)
Collection of loans	100,010		120,967	117,561
Increase in deposits	(299,564)		(397,078)	(468,734)
Decrease in deposits	259,930		110,383	161,166
Proceeds from disposals of assets held-for-sale	18,716		0	0
Receipt of government grants	30,416		55,533	32,878
Net cash inflow from changes in consolidation scope	2,141		0	3,754
Other cash inflow (outflow) from investing activities, net	(53,769)		1,414	(20,400)
Net cash flows used in investing activities	(13,014,301)		(12,606,699)	(9,645,870)
Cash flows from financing activities
Proceeds from (Repayment of) short-term borrowings, Net	(183,660)		370,328	(49,604)
Proceeds from long-term borrowings and debt securities	14,251,586		10,098,067	2,302,060
Repayment of long-term borrowings and debt securities	(8,095,590)		(8,198,882)	(7,750,047)
Payment of finance lease liabilities	(134,454)		(122,919)	(118,215)
Settlement of derivative instruments, net	60,907		33,434	73,246
Change in non-controlling interest	20,113		23,582	10,538
Repayment of hybrid bond	0		(99,750)	0
Dividends paid (hybrid bond)	(17,658)		(15,856)	(16,455)
Dividends paid	(599,391)		(1,340,387)	(2,088,429)
Other cash outflow from financing activities, net	(175)		(2,023)	(570)
Net cash flows from (used in) financing activities	5,301,678		745,594	(7,637,476)
Net increase (decrease) in cash and cash equivalents before effect of exchange rate changes	(1,032,491)		(611,211)	(762,794)
Effect of exchange rate fluctuations on cash held	21,097		(70,403)	31,082
Net increase (decrease) in cash and cash equivalents	(1,011,394)		(681,614)	(731,712)
Cash and cash equivalents at January 1	2,369,739		3,051,353	3,783,065
Cash and cash equivalents at December 31	₩ 1,358,345		₩ 2,369,739	₩ 3,051,353
[1]	KRW8,104 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 included.

Reporting Entity (Description o

Reporting Entity (Description of the controlling company)	12 Months Ended
	Dec. 31, 2018
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 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. KEPCO’s head office is located in Naju, Jeollanam-do. As of December 31, 2018, KEPCO’s share capital amounts to ￦3,209,820 million and KEPCO’s shareholders are as follows: Number of shares Percentage of ownership Government of the Republic of Korea 116,841,794 18.20 % Korea Development Bank 211,235,264 32.90 % Foreign investors 173,769,250 27.07 % Other 140,117,769 21.83 % 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, 2018
Basis of Preparation [Abstract]
Basis of Preparation	2. Basis of Preparation The consolidated financial statements of Korea Electric Power Corporation and subsidiaries (the “Company”) were authorized for issuance by the Board of Directors on February 22, 2019. (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”), which is KEPCO’s functional and presentation currency. (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) Unbilled revenue Energy delivered but not metered nor billed is estimated at the reporting date based on consumption statistics and selling price estimates. Determination of the unbilled revenues at the end of the reporting period is sensitive to the estimated consumptions and prices based on statistics. Unbilled revenue recognized as of December 31, 2017 and 2018 are ￦1,672,385 million and ￦1,671,117 million, respectively. (ii) 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. 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 and other expenses as described in note 21, note 40 and note 53. 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 21 and note 53, 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 20 – Investments in Associates and Joint Ventures • Note 21 – Property, Plant and Equipment • Note 23 – Construction Services Contracts • Note 48 – 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 28 – Employment Benefits • Note 44 – Income Taxes (5) Changes in accounting policies The Company has initially applied IFRS 9 ‘Financial Instruments’ and IFRS 15 ‘Revenue from Contracts with Customers’ from January 1, 2018. Due to the transition methods chosen by the Company in applying these standards, comparative information throughout these financial statements has not been restated to reflect the requirements of the new standards. (i) IFRS 9 ‘Financial Instruments’ IFRS 9 sets out requirements for recognizing and measuring financial assets, financial liabilities and certain contracts to buy or sell non-financial The Company has taken an exemption not to restate comparative information for prior periods upon adoption of IFRS 9. Accordingly, the information presented for 2017 and 2016 has not been restated and differences in the carrying amounts of financial instruments resulting from the adoption of IFRS 9 are recognized in retained earnings and other components in equity at January 1, 2018. ① Classification and measurement of financial assets and financial liabilities IFRS 9 contains three principal classification categories for financial assets: measured at amortized cost, FVOCI and FVTPL. The classification of financial assets under IFRS 9 is generally based on the business model in which a financial assets is managed and its contractual cash flow characteristics. Under IFRS 9, derivatives embedded in contracts where the host is a financial asset in the scope of the standard are never separated. Instead, the hybrid financial instrument as a whole is assessed for classification. The adoption of IFRS 9 has not had a significant effect on the Company’s accounting policies related to financial liabilities and derivative financial instruments (for derivatives that are used as hedging instruments). The following table reconciles the carrying amounts of financial assets under IAS 39 to the carrying amounts under IFRS 9 on transition to IFRS 9 on January 1, 2018. Original classification under IAS 39 New classification under IFRS 9 Original carrying amount under IAS 39 New carrying amount under IFRS 9 In millions of won Financial assets at FVTPL FVTPL ￦ 111,512 111,512 Loans and receivables Amortized cost 15,203,663 14,405,570 Loans and receivables FVTPL — 791,324 Available-for-sale FVOCI 699,833 471,903 Available-for-sale FVTPL — 227,930 Held-to-maturity Amortized cost 3,144 3,144 Total financial assets (excluding derivative instruments) ￦ 16,018,152 16,011,383 ② Impairment of financial assets IFRS 9 replaces the ‘incurred loss’ model in IAS 39 with an ‘expected credit loss’ (ECL) model. The new impairment model applies to financial assets measured at amortized cost and debt investments at FVOCI, but not to investments in equity instruments. The Company has used an exemption not to restate comparative information for prior periods with respect to classification and measurement (including impairment) requirements. Differences in the carrying amounts of financial assets resulting from the adoption of IFRS 9 are recognized in other components of equity and retained earnings as at January 1, 2018 as follows: Equity attributable to owners Type Retained earnings Other of equity Non- controlling interests Total equity In millions of won Reclassification of cumulative gain or loss of available-for-sale ￦ 76,851 (76,851 ) — — Remeasurement of expected credit loss —Trade and other receivables (6,769 ) — — (6,769 ) —Income tax effect 1,846 — — 1,846 Total ￦ 71,928 (76,851 ) — (4,923 ) The detailed accounting policies under IFRS 9 are described in note 3.(21). (ii) IFRS 15 ‘Revenue from Contracts with Customers’ IFRS 15 ‘Revenue from Contracts with Customers’ replaced IAS 18 ‘Revenue’, IAS 11 ‘Construction Contracts’, SIC-31 Under IFRS 15, revenue is recognized when a customer obtains control of the goods or services. Determining the timing of the transfer of control at a point in time or over time requires judgment. The Company has retrospectively applied this standard and recognized the cumulative effect of the adoption of IFRS 15 at the date of initial application (January 1, 2018) and has retrospectively applied IFRS 15 to only those contracts that were not completed as of the date of initial application (January 1, 2018). Accordingly, the Company has not restated the comparative periods. IFRS 15 did not have a significant impact on the Company’s consolidated financial statements at the date of initial application (January 1, 2018). For additional information about the Company’s accounting policies relating to revenue recognition, see note 3.(7). (iii) IFRIC 22 ‘Foreign Currency Transactions and Advance Consideration’ The Company has adopted IFRIC 22 ‘Foreign Currency Transactions and Advance Consideration’ since January 1, 2018. IFRIC 22 ‘Foreign Currency Transactions and Advance Consideration’ clarifies the date of the transaction for the purpose of determining the exchange rate to use on initial recognition of the related asset, expense or income, when an entity has received or paid advance consideration in a foreign currency. Upon adoption of the interpretation, there is no significant impact on the Company’s consolidated financial statements. (iv) Amendments to IAS 40 ‘Investment Property’ The Company has adopted amendments to IAS 40 ‘Investment Property’ since January 1, 2018. Amendments to IAS 40 ‘Investment Property’ clarify when an entity should transfer a property asset to, or from, investment property. Upon adoption of the amendments, there is no significant impact on the Company’s consolidated financial statements. (6) Standards issued but not yet effective A number of new standards are effective for annual periods beginning after January 1, 2018 and earlier application is permitted; however, the Company has not early adopted the new or amended standards in preparing these consolidated financial statements. (i) IFRS 16 ‘Leases’ ① General information IFRS 16 replaces existing leases guidance, including IAS 17 ‘Leases’, IFRIC 4 ‘Determining whether an Arrangement contains a Lease’, SIC-15 SIC-27 The Company plans to apply IFRS 16 retrospectively with the cumulative effect of initially applying the standard recognized at the date of application initially on January 1, 2019. Therefore, the cumulative effect of adopting IFRS 16 will be recognized as an adjustment to the opening balance of retained earnings (or other component of equity, as appropriate) at January 1, 2019, with no restatement of comparative information. For a contract that is, or contains, a lease, and the Company shall account for each lease component within the contract as a lease separately from non-lease right-of-use low-value non-lease non-lease Lessor accounting remains similar to the existing guidance IAS 17 ‘Leases’—i.e. lessors continue to classify leases as finance or operating leases. ② Identifying a lease The Company assesses whether the contract is, or contains, a lease at inception of a contract and also shall identify whether the contract is, or contains, a lease at the date of initial application. The definition of this new standard is mainly related to the control model. This standard classifies a lease contract and a service contract based on whether the identified asset is controlled by the customer. If the customer has all of the following rights, right-of-use • Right to obtain substantially all of the economic benefits from use of the identified asset • Right to direct the use of the identified asset The Company is still evaluating whether certain agreements related to the use of vessels, real estate and facilities contain leases that shall be accounted for in accordance with IFRS 16 as of the authorization date for issuance of these consolidated financial statements. ③ Lessee accounting The adoption of IFRS 16 will change the accounting of operating leases, which was previously not included in the consolidated statements of financial position under IAS 17, and at the date of initial application of IFRS 16, the Company shall account for all leases, except for short-term leases and leases of low-value • recognizes the present value of the lease payments that are not paid at the date of initial recognition in the consolidated statements of financial position as right-of-use • recognizes the depreciation charge for right-of-use • classifies cash payments for the principal portion (financial activities) and for the interest portion (operating activities) in the consolidated statements of cash flows ④ Lessor accounting Under IFRS 16, a lessor continues to classify each of its leases as either a finance leases or an operating leases. However, under IFRS 16, a lessor shall disclose additional information such as the nature of the lessor’s leasing activities and how the lessor manages the risk associated with any rights it retains in underlying assets. The Company has been analyzing the impact of the adoption of IFRS 16 on its consolidated financial statements. However, it is practically difficult to provide reasonable estimates of the impact until the Company has completed such analysis.

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2018
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 for all periods presented. (1) Basis of consolidation The consolidated financial statements are the financial statements of a group in which the assets, liabilities, equity, income, expenses and cash flows of the parent and its subsidiaries are presented as those of a single economic entity. Subsidiaries are 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, the income 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 income 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 income 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 income 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 income or loss on the disposal of the related assets or liabilities, the Company reclassifies the gain or loss from equity to income 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 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. (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) Identify the performance obligations in the contract The Company is engaged in the generation, transmission and distribution of electricity and development of electric power resources, and electricity sales revenue accounts for 93.8% of consolidated revenue for the year ended December 31, 2018. Under IFRS 15, supplying electricity is a series of distinct goods or services identified as a single performance obligation. The Company is also engaged in contracts with customers for transmission and distribution, provision of power generation byproducts, EPC business, O&M, etc. that are identified as separate performance obligations for each contract. (ii) Variable consideration The Company may be subject to a variation of consideration paid by the customer due to the progressive electricity billing system, discounts on electricity bills for policy purposes, penalties and delinquent payment, etc. The Company estimates an amount of variable consideration by using the expected value method that the Company expects to better predict the amount of consideration to which it will be entitled, and includes in the transaction price some or all of an amount of variable consideration 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. (iii) Performance obligations satisfied over time The Company satisfies its performance obligations for contracts such as EPC business, O&M, etc. over time. The Company recognizes revenue based on the percentage-of-completion The Company recognizes revenue over time if one of the following criteria is met: (a) the customer simultaneously receives and consumes the benefits provided by the Company’s performance as the entity performs; (b) the Company’s performance creates or enhances an asset that the customer controls as the asset is created or enhanced; or (c) the Company’s performance does not create an asset with an alternative use to the entity and the entity has an enforceable right to payment for performance completed to date. (8) Leases The Company classifies and accounts for leases as either a finance or operating lease, depending on the terms. Leases where the Company assumes substantially all of the risks and rewards of ownership are classified as finance leases. All other leases are classified as operating leases. (i) The Company as lessor Amounts due from lessees under finance leases are recognized as receivables at the amount of the Company’s net investment in the leases. Finance lease income is allocated to accounting periods so as to reflect a constant periodic rate of return on the Company’s net investment outstanding in respect of the leases. Rental income from operating leases is recognized on a straight-line basis over the term of the relevant lease. Initial direct costs incurred in negotiating and arranging an operating lease are added to the carrying amount of the leased asset and recognized on a straight-line basis over the lease term. (ii) The Company as lessee Leases are classified as finance leases whenever the terms of the lease transfer substantially all the risks and rewards of ownership to the lessee. All other leases are classified as operating leases. Assets held under finance leases are initially recognized as assets of the Company at their fair value at the inception of the lease or, if lower, at the present value of the minimum lease payments. The corresponding liability to the lessor is included in the statement of financial position as a finance lease obligation. Lease payments are apportioned between finance expenses and reduction of the lease obligation so as to achieve a constant rate of interest on the remaining balance of the liability. Finance expenses are recognized immediately in income or loss, unless they are directly attributable to qualifying assets, in which case they are capitalized in accordance with the Company’s general policy on borrowing costs. Contingent rentals are recognized as expenses in the periods in which they are incurred. Operating lease payments are recognized as an expense on a straight-line basis over the lease term, except where another systematic basis is more representative of the time pattern in which economic benefits from the leased asset are consumed. Contingent rentals arising under operating leases are recognized as an expense in the period in which they are incurred. In the event that lease incentives are received to enter into operating leases, such incentives are recognized as a liability. The aggregate benefit of incentives is recognized as a reduction of rental expense on a straight-line basis, except where another systematic basis is more representative of the time pattern in which economic benefits from the leased asset are consumed. (iii) Determining whether an arrangement contains a lease At inception of an arrangement, the Company determines whether the arrangement is or contains a lease. At inception or on reassessment of an arrangement that contains a lease, the Company separates payments and other consideration required by the arrangement into those for the lease and those for other elements on the basis of their relative fair values. If the Company concludes for a finance lease that it is impracticable to separate the payments reliably, then an asset and a liability are recognized at an amount equal to the fair value of the underlying asset. (9) 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.(23) 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 income 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. (10) 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 income or loss in the period in which they are incurred. (11) Government grants and income related to transfer of assets from customers 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. The Company recovers a substantial amount of the cost related to its electric power distribution facilities from customers through the transfer of assets, while the remaining portion is recovered through electricity sales from such customers in the future. As such, the Company believes there exists a continued service obligation to the customers when the Company receives an item of property, equipment, or cash for constructing or acquiring an item of property or equipment, in exchange for supplying electricity to customers. The Company defers the amounts received, which are subsequently recognized as other income on a straight-line basis over the estimated service period which does not exceed the transferred asset’s useful life. (12) 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. (13) 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. 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 income 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. (14) 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 Finance lease assets 6 ~ 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. As a result of such annual review, useful lives of certain structures and machinery were changed during the year ended December 31, 2018. Depreciation expenses decreased by ￦25,985 million for the year ended December 31, 2018. Depreciation expenses are expected to decrease by ￦157,333 million and ￦170,471 million for the years ending December 31, 2019 and 2020, respectively, and to increase by ￦353,789 million for the years after December 31, 2020. 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 income or loss when the asset is derecognized. (15) 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

Segment, Geographic and Other I

Segment, Geographic and Other Information	12 Months Ended
	Dec. 31, 2018
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 arms-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, 2016, 2017 and 2018, respectively, are as follows: 2016 Segment Total segment revenue Intersegment revenue Revenue from external customers Depreciation and amortization Interest income Interest expense Profit (loss) related to associates and joint ventures Employee benefit expense Loss on abandonment of property, plant, and equipment Increase in provisions, net Operating profit (loss) In millions of won Transmission and distribution ￦ 59,862,284 1,890,489 57,971,795 3,226,700 80,882 844,200 (128,402 ) 162,326 424,356 711,430 5,274,308 Electric power generation (Nuclear) 11,168,579 11,129,385 39,194 3,130,820 33,111 474,590 (1,082 ) 70,582 — 576,223 3,770,165 Electric power generation (Non-nuclear) 21,394,223 20,561,044 833,179 2,523,306 24,171 359,607 (8,342 ) 79,846 2,133 276,619 3,211,684 Plant maintenance & engineering service 2,618,388 2,190,207 428,181 98,843 10,672 2,156 478 86,268 — 221,301 210,680 Others 567,836 77,098 490,738 26,817 115,928 97,926 — 1,050 30 168 76,336 Consolidation adjustments (35,848,223 ) (35,848,223 ) — (45,498 ) (22,986 ) (25,611 ) — (26,319 ) — (3,009 ) (246,813 ) ￦ 59,763,087 — 59,763,087 8,960,988 241,778 1,752,868 (137,348 ) 373,753 426,519 1,782,732 12,296,360 Finance income 791,543 Finance expense (2,437,087 ) Loss related to associates and joint ventures (137,348 ) Profit before income tax ￦ 10,513,468 2017 Segment Total segment revenue Intersegment revenue Revenue from external customers Depreciation and amortization Interest income Interest expense Profit (loss) related to associates and joint ventures Employee benefit expense Loss on abandonment of property, plant, and equipment Increase in provisions, net Operating profit (loss) 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 Profit 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 ) (3) Information related to segment assets and segment liabilities as of and for the years ended December 31, 2017 and 2018 are as follows: 2017 Segment Segment Investments Acquisition of non-current Segment In millions of won Transmission and distribution ￦ 106,540,154 3,366,309 6,606,512 50,757,798 Electric power generation (Nuclear) 55,011,096 11,843 2,083,967 29,252,816 Electric power generation (Non-nuclear) 47,938,084 1,904,224 3,250,524 26,337,295 Plant maintenance & engineering service 3,273,959 48,320 145,779 1,176,627 Others 7,798,400 — 569,447 3,013,743 Segment totals 220,561,693 5,330,696 12,656,229 110,538,279 Consolidation adjustments: Elimination of inter-segment amounts (39,517,829 ) — 23,616 (5,239,156 ) Equity method adjustment 754,314 — — — Deferred taxes 2,215 — — 5,339,450 Others (11,478 ) — — (1,814,299 ) (38,772,778 ) — 23,616 (1,714,005 ) Consolidated totals ￦ 181,788,915 5,330,696 12,679,845 108,824,274 2018 Segment Segment 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 (4) Geographic information Electric sales, the main operations of the Company, are conducted in the Republic of Korea where the controlling company is located. The following information on revenue from external customers and non-current Geographical unit Revenue from external customers Non-current assets(*2) 2016 2017 2018 2016 2017 2018 In millions of won Domestic ￦ 55,310,011 55,652,807 57,799,991 148,297,677 153,436,810 157,037,428 Overseas(*1) 4,453,076 3,683,082 2,233,071 4,474,699 4,497,535 3,299,346 ￦ 59,763,087 59,335,889 60,033,062 152,772,376 157,934,345 160,336,774 (*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 individual customer comprising more than 10% of the Company’s revenue for the years ended December 31, 2016, 2017 and 2018.

Classification of Financial Ins

Classification of Financial Instruments	12 Months Ended
	Dec. 31, 2018
Classification of Financial Instruments [Abstract]
Classification of Financial Instruments	5. Classification of Financial Instruments (1) Classification of financial assets as of December 31, 2017 and 2018 are as follows: 2017 Financial Loans and Available-for-sale Held-to-maturity Derivative assets Total In millions of won Current assets Cash and cash equivalents ￦ — 2,369,739 — — — 2,369,739 Current financial assets Held-to-maturity — — — 5 — 5 Derivative assets 12,923 — — — 12 12,935 Other financial assets — 1,945,417 — — — 1,945,417 Trade and other receivables — 7,928,972 — — — 7,928,972 12,923 12,244,128 — 5 12 12,257,068 Non-current Non-current Available-for-sale — — 699,833 — — 699,833 Held-to-maturity — — — 3,139 — 3,139 Derivative assets 9,097 — — — 10,594 19,691 Other financial assets 111,512 1,204,738 — — — 1,316,250 Trade and other receivables — 1,754,797 — — — 1,754,797 120,609 2,959,535 699,833 3,139 10,594 3,793,710 ￦ 133,532 15,203,663 699,833 3,144 10,606 16,050,778 2018 Financial Financial assets Financial 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 (2) Classification of financial liabilities as of December 31, 2017 and 2018 are as follows: 2017 Financial liabilities at fair value through profit or loss Financial liabilities Derivative liabilities Total In millions of won Current liabilities Borrowings ￦ — 1,165,985 — 1,165,985 Debt securities — 7,957,300 — 7,957,300 Derivative liabilities 51,090 — 20,177 71,267 Trade and other payables — 5,999,521 — 5,999,521 51,090 15,122,806 20,177 15,194,073 Non-current Borrowings — 2,434,624 — 2,434,624 Debt securities — 43,189,483 — 43,189,483 Derivative liabilities 99,839 — 256,953 356,792 Trade and other payables — 3,223,480 — 3,223,480 99,839 48,847,587 256,953 49,204,379 ￦ 150,929 63,970,393 277,130 64,398,452 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 (3) Classification of comprehensive income (loss) from financial instruments for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 2017 2018 In millions of won Cash and cash equivalents Interest income ￦ 61,380 35,474 40,704 Financial assets at fair value through profit or loss Interest income — — 21,713 Gain on valuation of derivatives — — 34,117 Gain on transaction of derivatives — — 39,114 Gain on valuation of financial assets — — 1,879 Gain on disposal of financial assets — — 1,837 Financial assets at fair value through profit or loss Interest income — 290 — Gain (loss) on valuation of derivatives 113,671 (214,100 ) — Loss on transaction of derivatives (8,039 ) (37,266 ) — Gain on valuation of financial assets — 12 — Financial assets at fair value through other comprehensive income Dividends income — — 12,777 Available-for-sale Dividends income 9,446 11,477 — Impairment loss on available-for-sale financial assets (86,703 ) (2,713 ) — Gain (loss) on disposal of available-for-sale 1,473 (1,213 ) — Financial assets at amortized cost Interest income — — 89 Held-to-maturity Interest income 97 82 — Loans and receivables Interest income 25,106 30,014 21,925 Trade and other receivables Interest income 102,237 102,727 90,390 Short-term financial instruments Interest income 45,763 29,412 41,025 Long-term financial instruments Interest income 7,195 8,144 7,920 Other financial assets Interest income — — 1 Derivative assets (applying hedge accounting) Gain (loss) on valuation of derivatives (profit or loss) 145,458 (41,129 ) 69,799 Gain on valuation of derivatives (equity, before tax)(*) 50,047 2,453 8,600 Gain (loss) on transaction of derivatives (13,994 ) (58,299 ) 34,152 Financial liabilities at fair value through profit or loss Loss on valuation of derivatives — — (4,650 ) Gain on transaction of derivatives — — 36,046 Financial liabilities at fair value through profit or loss Gain (loss) on valuation of derivatives 23,225 (179,879 ) — Gain (loss) on transaction of derivatives 17,045 (27,175 ) — Financial liabilities carried at amortized cost Interest expense of borrowings and debt securities (1,202,065 ) (1,240,727 ) (1,320,516 ) Loss on retirement of financial liabilities (23,000 ) (5 ) — Interest expense of trade and other payables (68,375 ) (57,160 ) (42,830 ) Interest expense of others (482,428 ) (491,665 ) (505,112 ) Gain (loss) on foreign currency transactions and translations (290,485 ) 1,075,215 (356,159 ) Derivative liabilities (applying hedge accounting) Gain (loss) on valuation of derivatives (profit or loss) 5,714 (439,559 ) 53,937 Gain (loss) on valuation of derivatives (equity, before tax)(*) (3,297 ) 29,431 (15,029 ) Gain (loss) on transaction of derivatives (51,450 ) (46,221 ) 37,985 (*) Items are included in other comprehensive income or loss. All other income and gain amounts listed above are included in finance income, and all expense and losses listed above are included in finance expenses in the consolidated statements of comprehensive income or loss.

Restricted Deposits

Restricted Deposits	12 Months Ended
	Dec. 31, 2018
Restricted Deposits [Abstract]
Restricted Deposits	6. Restricted Deposits Restricted deposits as of December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Cash and cash equivalents Escrow accounts ￦ 53 — Deposits for government project 15,365 12,747 Collateral provided for borrowings 79,569 100,998 Collateral provided for lawsuit 2 3 Deposits for transmission regional support program 2,320 4,337 Decommissioning costs of nuclear power plants — 604 Short-term financial instruments Bidding guarantees 119 — Restriction on withdrawal related to ‘win-win for small and medium enterprises 34,000 34,000 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 Financial assets at fair value through profit or loss Decommissioning costs of nuclear power plants 108,512 — Non-current available-for-sale Decommissioning costs of nuclear power plants 214,156 — Long-term financial instruments Escrow accounts — 69 Guarantee deposits for checking account 2 — Guarantee deposits for banking accounts at oversea branches 302 315 Decommissioning costs of nuclear power plants 337,234 245,896 Funds for developing small and medium enterprises(*) 200,000 200,000 ￦ 991,634 1,126,975 (*) Deposits for small and medium enterprise at IBK and others for construction of Bitgaram Energy Valley and support for the high potential businesses as of December 31, 2017 and 2018.

Cash and Cash Equivalents

Cash and Cash Equivalents	12 Months Ended
	Dec. 31, 2018
Cash and Cash Equivalents [Abstract]
Cash and Cash Equivalents	7. Cash and Cash Equivalents Cash and cash equivalents as of December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Cash ￦ 132 138 Other demand deposits 968,966 927,650 Short-term deposits classified as cash equivalents 559,239 211,424 Short-term investments classified as cash equivalents 841,402 219,133 ￦ 2,369,739 1,358,345

Trade and Other Receivables

Trade and Other Receivables	12 Months Ended
	Dec. 31, 2018
Trade and Other Receivables [Abstract]
Trade and Other Receivables	8. Trade and Other Receivables (1) Trade and other receivables as of December 31, 2017 and 2018 are as follows: 2017 Gross amount Allowance for doubtful accounts Present value discount Book value In millions of won Current assets Trade receivables ￦ 7,499,285 (173,583 ) — 7,325,702 Other receivables 614,212 (9,199 ) (1,743 ) 603,270 8,113,497 (182,782 ) (1,743 ) 7,928,972 Non-current Trade receivables 449,191 — (414 ) 448,777 Other receivables 1,380,983 (68,809 ) (6,154 ) 1,306,020 1,830,174 (68,809 ) (6,568 ) 1,754,797 ￦ 9,943,671 (251,591 ) (8,311 ) 9,683,769 2018 Gross amount Allowance for doubtful accounts Present value discount Book value 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 (2) Other receivables as of December 31, 2017 and 2018 are as follows: 2017 Gross amount Allowance for doubtful accounts Present value discount Book value In millions of won Current assets Non-trade ￦ 314,256 (9,199 ) — 305,057 Accrued income 54,002 — — 54,002 Deposits 228,317 — (1,743 ) 226,574 Finance lease receivables 13,067 — — 13,067 Others 4,570 — — 4,570 614,212 (9,199 ) (1,743 ) 603,270 Non-current Non-trade 112,983 (59,117 ) — 53,866 Accrued income 182 — — 182 Deposits 331,071 — (6,154 ) 324,917 Finance lease receivables 849,554 — — 849,554 Others 87,193 (9,692 ) — 77,501 1,380,983 (68,809 ) (6,154 ) 1,306,020 ￦ 1,995,195 (78,008 ) (7,897 ) 1,909,290 2018 Gross amount Allowance for doubtful accounts Present value discount Book value 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 (3) Trade and other receivables are classified as loans and receivables, and are measured using the effective interest method. No interest is accrued for trade receivables related to electricity for the duration between the billing date and the payment due dates. But 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, 2017 and 2018 are as follows: 2017 2018 In millions of won Trade receivables: (not overdue) ￦ 7,698,604 7,419,648 Trade receivables: (overdue, not impaired) 7,117 — Less than 60 days 7,117 — Trade receivables: (impairment reviewed) 242,755 298,735 Less than 60 days — 2,525 60 ~ 90 days 39,070 37,266 90 ~ 120 days 17,502 16,033 120 days ~ 1 year 55,242 46,204 Over 1 year 130,941 196,707 7,948,476 7,718,383 Less: allowance for doubtful accounts (173,583 ) (215,868 ) Less: present value discount (414 ) (448 ) ￦ 7,774,479 7,502,067 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, 2017 and 2018 are as follows: 2017 2018 In millions of won Other receivables: (not overdue) ￦ 1,810,075 2,075,601 Other receivables: (overdue, not impaired) 47,532 — Less than 60 days 47,532 — Other receivables: (impairment reviewed) 137,588 149,423 Less than 60 days — 24,782 60 ~ 90 days 44 1,007 90 ~ 120 days 1,017 10,997 120 days ~ 1 year 11,042 23,991 Over 1 year 125,485 88,646 1,995,195 2,225,024 Less: allowance for doubtful accounts (78,008 ) (104,726 ) Less: present value discount (7,897 ) (8,928 ) ￦ 1,909,290 2,111,370 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 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. (6) Changes in the allowance for doubtful accounts for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 2017 2018 Trade Other Trade Other Trade Other In millions of won Beginning balance ￦ 51,956 91,746 71,985 87,661 173,583 78,008 Effect of change in accounting policy — — — — 6,641 128 Loss allowance as at January 1, 2018 under IFRS 9 — — — — 180,224 78,136 Bad debt expense 38,719 233 126,714 1,778 41,498 17,817 Write-off (18,939 ) (928 ) (32,995 ) (3,129 ) (7,696 ) (244 ) Reversal — (5,489 ) — (2,166 ) (1,726 ) (143 ) Others 249 2,099 7,879 (6,136 ) 3,568 9,160 Ending balance ￦ 71,985 87,661 173,583 78,008 215,868 104,726

Financial Assets at Fair Value

Financial Assets at Fair Value through Profit or Loss	12 Months Ended
	Dec. 31, 2018
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 are as follows: 2018 Current Non-current In millions of won Financial assets at fair value through profit or loss(*3) Beneficiary securities(*1) ￦ 100 320,148 Cooperative(*1) — 5,052 Other(*2) 313,793 83,586 313,893 408,786 Financial assets designated as at fair value through profit or loss(*3) Debt with embedded derivatives(*2) — 187,483 Other — 10,773 — 198,256 ￦ 313,893 607,042 (*1) For the year ended December 31, 2017, the Company had designated the financial assets as available-for-sale (*2) For the year ended December 31, 2017, the Company had designated the financial assets as long-term/short-term financial instrument (note 2.(5)). (*3) As of December 31, 2018, the Company invested ￦528,006 million exclusively for payment of decommissioning costs of nuclear power plants.

Financial Assets at Fair Valu_2

Financial Assets at Fair Value through Other Comprehensive Income	12 Months Ended
	Dec. 31, 2018
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 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 (*) As described in note 2.(5), these financial assets were classified as available-for-sale (2) Financial assets at fair value through other comprehensive income as of December 31, 2018 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 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 Corporation 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 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 2018 Shares Ownership Acquisition Book value Fair value In millions of won 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 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 2018 Shares Ownership Acquisition Book value Fair value In millions of won 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 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 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 % — — — 2018 Shares Ownership Acquisition Book value Fair value In millions of won 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 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 Sayaaq 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 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 % — — — 2018 Shares Ownership Acquisition Book value Fair value In millions of won 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 cannot 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 financial assets at FVOCI in other comprehensive income or loss during the year ended December 31, 2018. (*4) The number of shares owned has changed due to capital reduction without refund (3:1), the stock merge (10,000:1) and the stock split (1:2,000) during the year ended December 31, 2018 (*5) As described in note 20, this is reclassified to financial assets at FVOCI 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.

Available-for-sale Financial As

Available-for-sale Financial Assets	12 Months Ended
	Dec. 31, 2018
Available-for-sale Financial Assets [Abstract]
Available-for-sale Financial Assets	11. Available-for-sale (1) Changes in available-for-sale 2017 Beginning Acquisition Disposal(*1) Valuation Impairment Others Ending In millions of won Listed ￦ 268,171 106 — 8,156 (97 ) (1,883 ) 274,453 Unlisted 746,561 233,179 (461,423 ) (2,908 ) (2,616 ) (87,413 ) 425,380 ￦ 1,014,732 233,285 (461,423 ) 5,248 (2,713 ) (89,296 ) 699,833 Short-term available-for-sale ￦ — — — — — — — Long-term available-for-sale ￦ 1,014,732 233,285 (461,423 ) 5,248 (2,713 ) (89,296 ) 699,833 (*1) The Company recognized gain and loss on disposal of available-for-sale (2) Available-for-sale 2017 Shares Ownership Acquisition Book value Fair value In millions of won Listed Korea District Heating Corp. 2,264,068 19.55 % ￦ 173,201 165,277 165,277 Ssangyong Motor Co., Ltd. 38,568 0.03 % 428 197 197 Sungjee Construction. Co., Ltd. 10,530 0.01 % 49 8 8 Korea Line Corp. 18 0.00 % 1 — — Namkwang Engineering & Construction Co., Ltd. 46 0.00 % 15 — — Bumyang Construction Co., Ltd.(*7) 35 0.00 % 2 — — ELCOMTEC Co., Ltd. 32,875 0.04 % 217 72 72 PAN ocean Co., Ltd. 1,492 0.00 % 14 8 8 Dongbu Corporation(*6) 955 0.02 % 12 10 10 KSP Co., Ltd. 6,324 0.08 % 24 24 24 STX Heavy Industries Co., Ltd. 35,749 0.14 % 191 165 165 PT Adaro Energy Tbk 480,000,000 1.50 % 71,554 70,531 70,531 Energy Fuels Inc. 1,711,814 2.38 % 16,819 3,300 3,300 Baralaba Coal Company Limited 99,763 0.07 % 18,445 22 22 Denison Mines Corp. 58,284,000 10.42 % 84,134 34,292 34,292 Fission 3.0 300,000 0.14 % — 15 15 Fission Uranium Corp. 800,000 0.16 % 785 532 532 365,891 274,453 274,453 Unlisted Korea investment—Korea EXIM Bank CERs Private Special Asset Investment Trust I 1,758,731,002 14.18 % 1,752 571 — Troika Overseas Resource Development Private Equity Firm 13,340,012,100 3.66 % 13,340 1,553 — IBK-AUCTUS 152 6.29 % 41 41 — Global Dynasty Overseas Resource Development Private Equity Firm 2,242,437,289 7.46 % 2,242 2,242 — 2017 Shares Ownership Acquisition Book value Fair value In millions of won Intellectual Discovery, Ltd. 1,000,000 8.81 % ￦ 5,000 954 — Hanwha-KOSEP New Renewable Energy Private Special Assets Investment Trust 1 4,176,751,013 5.00 % 4,328 4,328 — Construction Guarantee(*2) 571 0.02 % 601 833 833 Plant & Mechanical Contractors Financial Cooperative of Korea 144 0.03 % 126 126 — Fire Guarantee 40 0.01 % 20 20 — Korea Software Financial Cooperative 5,186 1.09 % 3,301 3,301 — Engineering Financial Cooperative 486 0.05 % 60 60 — Electric Contractors Financial Cooperative 1,000 0.04 % 216 216 — Korea Specialty Contractor Financial Cooperative 476 0.01 % 417 417 — Information & Communication Financial Cooperative 121 0.02 % 26 26 — Korea Electric Engineers Association 400 0.24 % 40 40 — Samsung investment—Investment Pool for Public funds 1(*5) — — 53,220 53,739 53,739 Korea investment—Hanwha KT Master Lease Private Special Investment — — 26,586 26,591 26,591 Kyobo Royal-Class Repo Plus Fixed Income 1Y 2nd(*5) — — 33,000 33,008 33,008 Kyobo Royal-Class Repo Plus Fixed Income 2Y 1st(*5) — — 50,000 50,399 50,399 Kyobo Royal-Class Repo Plus A1 ABCP 1Y(*5) — — 50,000 50,419 50,419 Hwan Young Steel Co., Ltd. 10,916 0.14 % 1,092 97 — SAMBO AUTO. Co., Ltd. 15,066 0.02 % 38 38 — Mobo Co., Ltd. 504 0.00 % 14 14 — Dae Kwang Semiconductor Co., Ltd. 589 0.07 % 6 6 — Sanbon Department Store 828 0.01 % 124 3 — Miju Steel Mfg. Co., Ltd. 99,804 0.23 % 50 50 — Sungwon Co., Ltd. 589 0.07 % 15 15 — Hana Civil Engineering Co., Ltd. 23 0.00 % 1 1 — KC Development Co., Ltd. 839 0.02 % 6 6 — IMHWA Corp. 329 0.11 % 5 5 — DALIM Special Vehicle Co., Ltd. 58 0.08 % 10 10 — ASA JEONJU Co., Ltd. 34,846 1.34 % 697 69 — Moonkyung Silica Co., Ltd. 42 0.56 % — — — Sungkwang Timber Co., Ltd. 9 0.34 % 4 4 — Yongbo Co., Ltd. 61 0.20 % 3 3 — HJ Steel Co., Ltd. 218 0.07 % 2 2 — KS Remicon Co., Ltd. 12 0.04 % 3 3 — Joongang Platec Co., Ltd. 3,591 0.75 % 72 35 — Pyungsan SI Ltd. 434 0.01 % 9 9 — Samgong Development Co., Ltd. 12 0.01 % 7 7 — Joongang Development Co., Ltd. 540 0.12 % 8 8 — AJS Co., Ltd. 12,906 0.23 % 32 32 — SHIN-E 119 0.13 % 10 10 — MSE Co., Ltd. 429 0.13 % 9 9 — Ilrim Nano Tec Co., Ltd. 1,520 0.07 % 15 15 — Youngjin Hi-Tech 2,512 0.25 % 126 21 — Buyoung Co., Ltd. 270 0.00 % 3 3 — 2017 Shares Ownership Acquisition Book value Fair value In millions of won Ilsuk Co., Ltd. 152 0.17 % ￦ 10 10 — Dongyang Telecom Co., Ltd. 1,760 0.01 % 11 11 — Jongwon Remicon Co., Ltd. 31 0.18 % 13 13 — Ace Heat Treating Co., Ltd. 477 1.43 % 72 72 — Zyle Daewoo Motor Sales Co., Ltd. 22 0.00 % — — — Daewoo Development Co., Ltd. 8 0.00 % — — — Seyang Inc. 537 0.05 % 27 27 — Seungri Enterprise Co., Ltd. 93 0.05 % 3 3 — Onggane Food Co., Ltd 5 0.07 % 1 1 — Shin-E 12 0.00 % 1 1 — Ejung Ad Co., Ltd. 132 0.09 % 3 3 — Solvus Co., Ltd. 1,056 0.04 % 3 3 — Myung Co., Ltd. 89 0.05 % 2 2 — Shinil Engineering Co., Ltd. 887 0.06 % 3 3 — Biwang Industry Co., Ltd 406 0.04 % 2 2 — Huimun Co., Ltd. 263 0.26 % 4 4 — Young Sung Co., Ltd. 89 0.40 % 26 26 — Yuil Industrial Electronics Co., Ltd. 804 0.32 % 15 15 — DN TEK Inc. 12,401 0.29 % 61 5 — Kwang Jin Structure Co., Ltd. 3,072 0.60 % 31 31 — Woojin Industry Corporation 3 0.00 % 16 16 — Kwang Sung Industry Co., Ltd. 325 0.35 % 7 7 — Futech Mold Co., Ltd. 274 0.27 % 14 14 — Woojoo Environment Ind. Co., Ltd. 101 0.11 % 13 13 — CHONGATTI Agricultural Co., Inc. 57 0.10 % 4 4 — Hyungji Esquire Co., Ltd. 55 0.02 % 22 22 — Kolmar Pharma Co., Ltd. 1,426 0.01 % 52 3 — Morado Co., Ltd. 209 0.04 % 2 2 — Myung Sung Tex Co., Ltd. 20 0.00 % 2 2 — Kwang Sung Co., Ltd. 610 0.53 % 31 31 — EverTechno. Co., Ltd. 29,424 0.73 % 148 7 — Autowel Co., Ltd. 260 0.38 % 14 14 — Woobang Construction Co., Ltd. 8 0.00 % 8 8 — Shin Pyung Co., Ltd. 6 0.03 % 3 3 — JMC Heavy Industries Co., Ltd. 2,724 0.10 % 27 27 — Najin Steel Co., Ltd. 37 0.06 % 5 5 — Sinkwang Industry Co., Ltd. 1,091 1.68 % 5 5 — Crystal Co., Ltd. 22 0.07 % 2 2 — Elephant & Friends Co., Ltd. 563 0.61 % 3 3 — Mireco Co., Ltd. 109 0.25 % 11 11 — L&K Industry Co., Ltd. 1,615 0.60 % 24 24 — JO Tech Co., Ltd. 1,263 0.62 % 25 25 — Kendae Printing Co., Ltd. 422 0.60 % 21 21 — Dauning Co., Ltd. 231 0.41 % 6 6 — Korea Trecision Co., Ltd. 22 0.45 % 5 5 — Ace Track Co., Ltd. 3,130 1.08 % 219 59 — Taebok Machinery Co., Ltd. 109 1.08 % 11 11 — Yoo-A 105 0.20 % 11 11 — Dung Hwan Co., Ltd. 531 0.02 % 5 5 — Hurim Biocell Co., Ltd. 113 0.00 % 5 5 — Sunjin Power Tech Co., Ltd. 4,941 0.92 % 247 32 — Smart Power Co., Ltd. 133,333 4.83 % 200 200 — 2017 Shares Ownership Acquisition Book value Fair value In millions of won Haseung Industries Co., Ltd. 55 0.62 % ￦ 28 28 — Beer Yeast Korea Inc. 1,388 0.43 % 7 7 — Daeryung Corporation 207 0.19 % 10 10 — Korea Bio Red Ginseng Co., Ltd. 194 0.09 % 10 10 — ENH Co., Ltd. 1,086 0.19 % 54 54 — B CON Co., Ltd. 96 1.16 % 6 6 — Chunil Metal Co., Ltd. 11 0.15 % 4 4 — SsangMa Machine Co., Ltd. 4 0.05 % 1 1 — SinJin Co., Ltd. 233 0.30 % 9 9 — Ace Integration Co., Ltd 105 0.09 % 24 24 — AceInti Agricultural Co., Ltd. 16 0.02 % 5 5 — KyungDong Co., Ltd. 130 0.01 % 1 1 — ChunWon Development Co., Ltd. 193 0.19 % 39 39 — WonIl Co., Ltd. 999 0.15 % 50 50 — SungLim Industrial Co., Ltd. 29 0.03 % 1 1 — Korea Minerals Co., Ltd. 191 0.05 % 134 1 — HyoDong Development Co., Ltd. 119 0.15 % 24 24 — Haspe Tech Co., Ltd. 652 0.55 % 20 20 — JoHyun Co., Ltd. 350 1.56 % 18 18 — KC Co., Ltd. 5,107 0.17 % 3 3 — SeongJi Industrial Co., Ltd. 41 0.05 % 1 1 — DongKwang SD, Inc. 524 0.23 % 13 13 — Dong Yang Metal Co., Ltd. 2,951 1.97 % 15 15 — Seyang Precision Ind. Co., Ltd. 829 0.23 % 41 41 — Dooriwon Food System Co., Ltd. 13 0.27 % 1 1 — ShinShin Co., Ltd 339 1.12 % 17 17 — Kitorang Co., Ltd. 165 0.24 % 49 49 — Sung Kwang Co., Ltd. 23 0.37 % 6 6 — Hyundai Metal Co., Ltd. 3,757 5.60 % 1,416 1,416 — Shinheung petrol. Co. Ltd. 699 0.14 % 7 7 — Force TEC Co., Ltd. 3,501 0.02 % 18 18 — Haisung TPC Co., Ltd. 10,751 0.24 % 54 54 — Samsung Tech Co., Ltd. 486 1.28 % 97 97 — Tae Hyung Co., Ltd. 28 0.43 % 20 20 — Samyangplant Co., Ltd. 323 0.60 % 16 16 — Younil Metal Co., Ltd. 41 0.21 % 21 21 — Myungjin Tech Co., Ltd. 20 0.54 % 4 4 — Hankook Machine Tools Co., Ltd. 719 0.14 % 72 72 — Hankook Precision Ind Co., Ltd. 110 0.06 % 11 11 — Borneo International Furniture Co., Ltd. 64,037 0.28 % 97 14 — CJ Paradise Co., Ltd 24 0.02 % 12 12 — Han Young Technology Company Co., Ltd. 35 0.00 % — — — Jungdo Aluminium Co., Ltd. 8,527 0.35 % 128 128 — Ilheung Metal Co, Ltd. 280 0.83 % 28 28 — STX Offshore & Shipbuilding Co., Ltd 8,622 0.25 % 1,078 1,078 — Ptotronics Co., Ltd. 151 0.07 % 2 2 — NFT Co., Ltd. 136 0.40 % 8 8 — Echoroba Co., Ltd. 157 0.02 % 3 3 — Hyundaitech Co., Ltd. 1,363 0.87 % 27 27 — Eco Alux Co., Ltd. 239 0.22 % 48 48 — Daekyung Industry Co., Ltd. 9,112 0.94 % 13 13 — Dasan Material Co. Ltd. 29 0.04 % — — — 2017 Shares Ownership Acquisition Book value Fair value In millions of won Fish World Co., Ltd. 47 0.21 % ￦ 2 2 — SG Shinsung Engineering and Construction Co., Ltd. 10 0.00 % 6 6 — Samdo Industry Electric Co., Ltd. 48 0.02 % 1 1 — Taejung Industries Co., Ltd. 9,268 0.30 % 5 5 — Shinsei Trading Co., Ltd. 64 0.72 % 1 1 — Dynamic Co., Ltd. 111 0.19 % 3 3 — Green Alchemy Co., Ltd. 38,202 1.48 % 191 191 — IQ Power Asia Inc. 16,179 0.31 % 81 81 — Youone TBM Engineering & Construction Co., Ltd. 227,854 0.27 % 31 31 — KM Leatech 1,648 0.98 % 8 8 — Wonil T&I Co., Ltd. 229 0.17 % 23 23 — Semist Co., Ltd. 555 0.80 % 3 3 — DS POWER Co., Ltd.(*8) 580,000 2.34 % 2,900 1,223 1,223 Navanakorn Electric Co., Ltd.(*3) 4,442,800 26.93 % 17,216 16,410 — PT. Kedap Sayaaq 671 10.00 % 18,540 — — Set Holding(*4) 1,100,220 2.50 % 229,255 171,242 171,242 PT. Cirebon Energi Prasarana 22,420 10.00 % 2,612 2,401 — 522,782 425,380 387,454 ￦ 888,673 699,833 661,907 (*1) Investments in unlisted equity securities held by the Company for which a quoted market price does not exist in an active market and fair value cannot be measured reliably were measured at cost less impairment, if any. (*2) The Company has estimated the fair value of the investment in Construction Guarantee based upon the price which would be applied when the investment is returned. The Company has recognized the difference between its fair value and book value as a gain or loss on valuation of available-for-sale (*3) Although the Company holds more than 20% of the equity shares of these investments, the Company cannot exercise significant influence. (*4) 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 (*5) As of December 31, 2017, the Company invested in ￦214,156 million as beneficiary securities exclusively for payment of decommissioning cost of nuclear power plants. The Company has measured the fair value of the beneficiary securities based on its net asset value. (*6) The number of shares owned has changed due to the stock merge (9:7) during the year ended December 31, 2017. (*7) The number of shares increased due to the stock split (5:1). (*8) As described in note 20, this is reclassified to available-for-sale

Financial Assets at Amortized C

Financial Assets at Amortized Cost	12 Months Ended
	Dec. 31, 2018
Financial Assets at Amortized Cost [Abstract]
Financial Assets at Amortized Cost	12. Financial Assets at Amortized Cost Financial assets at amortized cost as of December 31, 2018 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 Financial bonds 11,000 — — — 11,000 ￦ 14,042 — — — 14,042 Current ￦ 11,956 — — — 11,956 Non-current 2,086 — — — 2,086

Held-to-maturity Investments

Held-to-maturity Investments	12 Months Ended
	Dec. 31, 2018
Held-to-maturity Investments [Abstract]
Held-to-maturity Investments	13. Held-to-maturity Held-to-maturity 2017 Beginning balance Acquisition Disposal Others Ending balance In millions of won Government bonds ￦ 3,244 250 (350 ) — 3,144 ￦ 3,244 250 (350 ) — 3,144 Current ￦ 114 — (113 ) 4 5 Non-current 3,130 250 (237 ) (4 ) 3,139

Derivatives

Derivatives	12 Months Ended
	Dec. 31, 2018
Derivatives [Abstract]
Derivatives	14. Derivatives (1) Derivatives as of December 31, 2017 and 2018 are as follows: 2017 2018 Current Non-current Current Non-current In millions of won Derivative assets Currency forward ￦ 45 — 2,128 12,606 Currency swap 12 15,711 39,979 43,436 Interest rate swap — 2,697 — 2,342 Others(*1) 12,878 1,283 — 1,844 ￦ 12,935 19,691 42,107 60,228 Derivative liabilities Currency forward ￦ 7,862 1,278 1,956 — Currency swap 61,997 296,098 14,881 233,690 Interest rate swap 1,408 59,416 1,439 58,042 Others(*2) — — 2,155 — ￦ 71,267 356,792 20,431 291,732 (*1) The Company has a put option to sell shares of DS POWER Co., Ltd. and the fair value of the option is recorded in ‘Others’. (*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’. (2) Currency forward contracts which are not designated as hedge instruments as of December 31, 2018 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 KEB Hana Bank 2014.04.10 2021.07.12 ￦ 55,120 USD 52,000 ￦ 1,060.00 KEB 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 KEB Hana Bank 2014.05.09 2021.07.12 104,600 USD 100,000 1,046.00 KEB 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 Mizuho Bank 2018.11.28 2019.01.02 6,768 USD 6,000 1,127.95 Mizuho Bank 2018.12.07 2019.01.11 11,169 USD 10,000 1,116.90 CCB 2018.12.11 2019.01.14 11,280 USD 10,000 1,127.96 Nonghyup Bank 2018.12.17 2019.01.22 11,295 USD 10,000 1,129.45 Korea Development Bank 2018.12.18 2019.01.22 11,279 USD 10,000 1,127.85 Morgan Stanley 2018.12.19 2019.01.23 11,233 USD 10,000 1,123.30 Standard Chartered 2018.12.19 2019.01.24 11,235 USD 10,000 1,123.50 Kookmin Bank 2018.12.20 2019.01.28 11,273 USD 10,000 1,127.25 Woori Bank 2018.12.20 2019.01.28 11,272 USD 10,000 1,127.15 KEB Hana Bank 2018.12.21 2019.01.29 13,459 USD 12,000 1,121.60 Morgan Stanley 2018.12.24 2019.01.30 11,289 USD 10,000 1,128.87 CCB 2018.12.26 2019.01.31 11,246 USD 10,000 1,124.60 Standard Chartered 2018.12.26 2019.01.31 5,624 USD 5,000 1,124.75 Nonghyup Bank 2018.12.27 2019.02.01 5,610 USD 5,000 1,121.90 KEB Hana Bank 2018.12.27 2019.02.01 5,606 USD 5,000 1,121.15 Standard Chartered 2018.12.28 2019.02.07 5,589 USD 5,000 1,117.80 KEB Hana Bank 2018.12.28 2019.02.07 5,584 USD 5,000 1,116.70 Mizuho Bank 2018.12.28 2019.02.07 11,172 USD 10,000 1,117.15 Societe Generale 2018.11.29 2019.01.04 11,206 USD 10,000 1,120.60 ING Bank 2018.12.20 2019.01.15 11,279 USD 10,000 1,127.89 ING Bank 2018.12.26 2019.01.23 11,248 USD 10,000 1,124.77 Nova Scotia 2018.12.07 2019.01.10 14,518 USD 13,000 1,116.80 Mizuho Bank 2018.12.06 2019.01.04 11,167 USD 10,000 1,116.67 Credit Agricole 2018.12.27 2019.01.23 11,208 USD 10,000 1,120.75 Korea Development Bank 2018.12.13 2019.01.10 4,490 USD 4,000 1,122.60 Korea Development Bank 2018.12.24 2019.01.10 13,497 USD 12,000 1,124.74 Korea Development Bank 2018.12.21 2019.01.15 10,103 USD 9,000 1,122.50 Korea Development Bank 2018.12.27 2019.01.23 11,207 USD 10,000 1,120.68 Korea Development Bank 2018.12.28 2019.01.23 13,412 USD 12,000 1,117.64 Societe Generale 2018.12.19 2019.01.21 7,853 USD 7,000 1,121.85 Societe Generale 2018.12.21 2019.01.28 8,974 USD 8,000 1,121.75 MUFG 2018.12.19 2019.01.21 6,730 USD 6,000 1,121.70 MUFG 2018.12.28 2019.02.07 8,929 USD 8,000 1,116.15 Nova Scotia 2018.12.19 2019.01.22 4,486 USD 4,000 1,121.50 Nova Scotia 2018.12.21 2019.01.28 8,976 USD 8,000 1,121.95 Nova Scotia 2018.12.27 2019.01.31 7,832 USD 7,000 1,118.90 Nonghyup Bank 2018.12.28 2019.02.07 10,041 USD 9,000 1,115.70 BNP Paribas 2018.12.28 2019.02.07 8,930 USD 8,000 1,116.30 CCB 2018.12.28 2019.02.07 7,812 USD 7,000 1,116.05 Credit Agricole 2018.12.28 2019.02.07 ￦ 7,812 USD 7,000 ￦ 1,115.95 KEB Hana Bank 2018.12.05 2019.01.07 16,697 USD 15,000 1,113.15 KEB Hana Bank 2018.12.07 2019.01.07 15,672 USD 14,000 1,119.43 Busan Bank 2018.12.28 2019.01.07 6,477 USD 5,800 1,116.70 Nonghyup Bank 2018.12.12 2019.01.07 3,380 USD 3,000 1,126.60 KEB Hana Bank 2018.12.13 2019.01.15 7,849 USD 7,000 1,121.25 Shinhan Bank 2018.12.20 2019.01.22 29,320 USD 26,000 1,127.68 Nonghyup Bank 2018.12.28 2019.02.15 53,666 USD 48,000 1,118.05 Credit Agricole 2018.11.02 2019.02.07 3,039 USD 2,729 1,113.60 Credit Agricole 2018.11.05 2019.02.07 5,564 USD 5,000 1,112.70 Nova Scotia 2018.11.07 2019.02.13 5,567 USD 5,000 1,113.40 Nova Scotia 2018.11.07 2019.02.13 4,458 USD 4,000 1,114.40 Societe Generale 2018.11.29 2019.03.04 5,568 USD 5,000 1,113.50 Societe Generale 2018.11.29 2019.03.04 3,674 USD 3,297 1,114.50 Credit Agricole 2018.12.03 2019.03.05 256 USD 231 1,109.10 Nova Scotia 2018.12.04 2019.03.06 5,522 USD 5,000 1,104.30 Nova Scotia 2018.12.04 2019.03.06 5,527 USD 5,000 1,105.30 Nova Scotia 2018.12.20 2019.03.26 5,589 USD 5,000 1,117.80 Nova Scotia 2018.12.20 2019.03.26 1,751 USD 1,565 1,118.80 Nova Scotia 2018.12.28 2019.04.02 5,565 USD 5,000 1,113.00 Nova Scotia 2018.12.28 2019.04.02 5,569 USD 5,000 1,113.80 Nova Scotia 2018.12.28 2019.04.02 5,576 USD 5,000 1,115.20 Nova Scotia 2018.12.28 2019.04.03 5,553 USD 5,000 1,110.60 Nova Scotia 2018.12.28 2019.04.03 5,558 USD 5,000 1,111.60 Nova Scotia 2018.12.28 2019.04.03 5,563 USD 5,000 1,112.60 (3) Currency swap contracts which are not designated as hedge instruments as of December 31, 2018 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 Credit Suisse 2014~2019 ￦ 118,632 CHF 100,000 2.98 % 1.50 % ￦ 1,186.32 Standard Chartered 2014~2019 114,903 CHF 100,000 4.00 % 1.50 % 1,149.03 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 KEB 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 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 KEB 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 HSBC 2014~2019 105,260 USD 100,000 2.48 % 2.38 % 1,052.60 Standard Chartered 2014~2019 ￦ 105,260 USD 100,000 2.48 % 2.38 % ￦ 1,052.60 Korea Development Bank 2016~2019 105,260 USD 100,000 2.48 % 2.38 % 1,052.60 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 KEB 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 KEB 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 115,387 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 KEB 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 (4) Currency swap contracts which are designated as hedge instruments as of December 31, 2018 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 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 KEB 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 JP Morgan 2014~2019 107,190 USD 100,000 3M Libor+3.25% 2.75% 1,071.90 Morgan Stanley 2014~2019 107,190 USD 100,000 3M Libor+3.25% 2.75% 1,071.90 Deutsche Bank 2014~2019 107,190 USD 100,000 3M Libor+3.25% 2.75% 1,071.90 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 Credit Agricole 2013~2019 118,343 CHF 100,000 3.47% 1.63% 1,183.43 Morgan Stanley 2013~2019 59,172 CHF 50,000 3.40% 1.63% 1,183.43 Nomura 2013~2019 59,172 CHF 50,000 3.47% 1.63% 1,183.43 Standard Chartered 2014~2019 104,490 USD 100,000 2.77% 2.63% 1,044.90 Credit Agricole 2014~2019 104,490 USD 100,000 2.77% 2.63% 1,044.90 Morgan Stanley 2014~2019 104,490 USD 100,000 2.70% 2.63% 1,044.90 Korea Development Bank 2018~2023 320,880 USD 300,000 2.03% 3.75% 1,069.60 KEB 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 KEB Hana Bank 2014~2020 55,340 USD 50,000 2.16% 2.50% 1,106.80 KEB 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 KEB 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 KEB 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 hedge instruments as of December 31, 2018 are as follows: Counterparty Contract Contract amount Contract interest rate per annum Pay Receive In millions of KEB Hana Bank 2017~2022 ￦ 100,000 2.01% 3M CD+0.24% KEB Hana Bank 2017~2022 100,000 2.06% 3M CD+0.27% Nomura(*1) 2017~2037 30,000 2.05% 3.08% KEB Hana Bank 2017~2021 200,000 2.45% 3M CD+0.32% Nomura(*2) 2018~2038 30,000 2.56% 3.75% KEB Hana Bank 2018~2023 200,000 2.15% 3M CD+0.19% KEB Hana Bank 2018~2023 200,000 2.17% 3M CD+0.19% KEB Hana Bank 2018~2023 150,000 2.03% 3M CD+0.21% Societe Generale 2017~2022 200,000 3M Libor+3.44% 3.77% 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. (*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. (6) Interest rate swap contracts which are designated as hedge instruments as of December 31, 2018 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 Credit Agricole 2018~2033 USD 92,686 3.98%~4.10% 6M USD Libor SMBC 2018~2033 USD 121,205 4.05%~4.18% 6M USD Libor Mizuho Bank 2016~2019 USD 36,890 1.56% 1.65% SMBC 2016~2019 USD 36,890 1.56% 1.65% Export-import bank of Korea 2016~2036 USD 2,564 3.00% 4.99% (7) Gain and loss on valuation and transaction of derivatives for the years ended December 31, 2016, 2017 and 2018 are as follows and included in finance income and costs in the consolidated statements of comprehensive income (loss): Net income effects of Net income effects of Accumulated other comprehensive income (loss) (*) 2016 2017 2018 2016 2017 2018 2016 2017 2018 In millions of won Currency forward ￦ 15,993 (41,889 ) 12,632 4,266 (28,223 ) 23,991 — — — Currency swap 253,035 (843,747 ) 145,088 (68,266 ) (137,376 ) 123,670 40,031 26,810 (12,516 ) Interest rate swap 8,517 6,909 (2,949 ) 7,562 (3,362 ) (364 ) 6,719 5,074 6,087 Other derivatives 10,523 4,060 (1,568 ) — — — — — — ￦ 288,068 (874,667 ) 153,203 (56,438 ) (168,961 ) 147,297 46,750 31,884 (6,429 ) (*) For the year ended December 31, 2018, the net gain on valuation of derivatives applying cash flow hedge accounting of ￦211 million, net of tax, is included in other comprehensive income or loss.

Other Financial Assets

Other Financial Assets	12 Months Ended
	Dec. 31, 2018
Other Financial Assets [Abstract]
Other Financial Assets	15. Other Financial Assets (1) Other financial assets as of December 31, 2017 and 2018 are as follows: 2017 2018 Current Non-current Current Non-current In millions of won Loans and receivables ￦ 244,309 711,069 123,657 639,673 Allowance for doubtful accounts — (8,948 ) (12 ) (4,940 ) Present value discount (976 ) (39,813 ) (992 ) (38,712 ) Long-term / short-term financial instruments(*1) 1,702,084 542,430 1,869,286 448,741 Financial assets at fair value through profit or loss(*1) — 111,512 — — ￦ 1,945,417 1,316,250 1,991,939 1,044,762 (*1) 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, 2017 and 2018 are as follows: 2017 Face value Allowance for Present value Book value In millions of won Short-term loans and receivables Loans for tuition ￦ 33,763 — (976 ) 32,787 Loans for housing 14,126 — — 14,126 Fisheries loan 352 — — 352 Other loans 196,068 — — 196,068 244,309 — (976 ) 243,333 Long-term loans and receivables Loans for tuition 408,803 — (39,716 ) 369,087 Loans for housing 140,452 — — 140,452 Loans for related parties 94,581 (8,948 ) — 85,633 Fisheries loan 960 — (97 ) 863 Other loans 66,273 — — 66,273 711,069 (8,948 ) (39,813 ) 662,308 ￦ 955,378 (8,948 ) (40,789 ) 905,641 2018 Face value Allowance for Present value Book 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 (3) Changes in the allowance for doubtful accounts of loans for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 2017 2018 In millions of won Beginning balance ￦ — 4,532 8,948 Bad debt expense 4,352 2,465 22 Other 180 1,951 (4,018 ) Ending balance ￦ 4,532 8,948 4,952 (4) Long-term and short-term financial instruments as of December 31, 2017 and 2018 are as follows: 2017 2018 Current Non-current Current Non-current In millions of won Time deposits ￦ 1,479,034 2 1,602,285 63,358 ABCP 145,000 65,600 — — CP 58,050 — — — CD 10,000 — 10,000 — RP 10,000 1,634 — — Others — 475,194 257,001 385,383 ￦ 1,702,084 542,430 1,869,286 448,741

Inventories

Inventories	12 Months Ended
	Dec. 31, 2018
Inventories [Abstract]
Inventories	16. Inventories Inventories as of December 31, 2017 and 2018 are as follows: 2017 Acquisition cost Valuation allowance Book value In millions of won Raw materials ￦ 3,528,835 (2,829 ) 3,526,006 Merchandise 107 — 107 Work-in-progress 138,709 (1,028 ) 137,681 Finished goods 72,923 (1,517 ) 71,406 Supplies 1,581,661 (3,940 ) 1,577,721 Inventories in transit 679,358 — 679,358 Other inventories 9,807 — 9,807 ￦ 6,011,400 (9,314 ) 6,002,086 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 The reversals of the allowance for loss on inventory valuation due to increase in the net realizable value of inventory deducted from cost of sales for the years ended December 31, 2016, 2017 and 2018 were ￦2,473 million, ￦437 million and ￦3,723 million, respectively. The amounts of loss from inventory valuation included in other gains or losses for the years ended December 31, 2016, 2017 and 2018 were ￦2,683 million, ￦3,875 million and ￦1,953 million, respectively.

Finance Lease Receivables

Finance Lease Receivables	12 Months Ended
	Dec. 31, 2018
Finance Lease Receivables [Abstract]
Finance Lease Receivables	17. Finance Lease Receivables (1) Finance lease contracts The Company entered into a power purchase agreement (“PPA”) with Jordan Electric Power Company to provide a 373MW level Qatrana gas combined power plant over a 25 year lease term, and accounts for the PPA as a finance lease. Also, the Company has fly-ash (2) Finance lease receivables as of December 31, 2017 and 2018 are as follows and included in current and non-current 2017 2018 Minimum lease Present value of lease payments Minimum lease Present value In millions of won Less than 1 year ￦ 49,542 13,067 124,918 84,688 1 ~ 5 years 381,181 203,990 467,518 223,622 More than 5 years 1,398,449 645,564 1,333,016 675,036 ￦ 1,829,172 862,621 1,925,452 983,346 Allowance for doubtful accounts — (1,133 ) ￦ 862,621 982,213 (3) There are no impaired finance lease receivables as of December 31, 2016 and 2017, and changes in the allowance for doubtful accounts of finance lease receivables for the year ended December 31, 2018 are as follows: 2018 In millions of won Beginning balance ￦ — Bad debt expense 1,133 Write-off — Other — Ending balance ￦ 1,133

Non-Financial Assets

Non-Financial Assets	12 Months Ended
	Dec. 31, 2018
Non-Financial Assets [Abstract]
Non-Financial Assets	18. Non-Financial Non-financial 2017 2018 Current Non-current Current Non-current In millions of won Advance payment ￦ 109,743 43,872 156,073 160,628 Prepaid expenses 251,715 90,118 290,944 90,449 Others(*1) 392,534 112,828 431,871 76,075 ￦ 753,992 246,818 878,888 327,152 (*1) Details of others as of December 31, 2017 and 2018 are as follows: 2017 2018 Current Non-current Current Non-current In millions of won Tax refund receivables ￦ 89,762 1,940 82,348 1,276 Greenhouse gas emissions rights 135,211 — 93,749 — Other quick assets(*2) 167,561 110,888 255,774 74,799 ￦ 392,534 112,828 431,871 76,075 (*2) The Company has 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, 2018
Consolidated Subsidiaries [Abstract]
Consolidated Subsidiaries	19. Consolidated Subsidiaries (1) Consolidated subsidiaries as of December 31, 2017 and 2018 are as follows: Percentage of ownership (%) Subsidiaries Key operation activities Location 2017 2018 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.(*2) Power generation KOREA 49.00 % 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 Canada Energy Ltd. Resources development CANADA 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 79.64 % 79.64 % Korea Electric Power Nigeria Ltd. Operation of utility plant NIGERIA 100.00 % 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 96.36 % 96.36 % PT KEPCO Resource Indonesia Holding company INDONESIA 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.(*4) Recycling fly ashes KOREA 86.22 % 86.22 % Commerce and Industry Energy Co., Ltd.(*5) Power generation KOREA 59.03 % 59.03 % KEPCO Singapore Holdings Pte., Ltd. Holding company SINGAPORE 100.00 % 100.00 % KOWEPO India Private Limited(*6) Holding company INDIA 100.00 % — KEPCO KPS Philippines Corp. Utility plant maintenance and others PHILIPPINES 51.00 % 51.00 % 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 % HI 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 99.75 % 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 % Cogentrix Solar Services, LLC Holding company USA 50.10 % — Solar Investments I, LLC Holding company USA 50.10 % — KEPCO Solar of Alamosa, LLC (formerly, Cogentrix of Alamosa, LLC) Power generation USA 50.10 % 50.10 % KEPCO-LG Holding company USA 70.00 % 70.00 % Mangilao Investment LLC Holding company USA 70.00 % 70.00 % KEPCO-LG Power generation USA 70.00 % 70.00 % Jeju Hanlim Offshore Wind Co., Ltd. Power generation KOREA 70.22 % 68.84 % PT. Siborpa Eco Power Construction and operation of utility plant INDONESIA 64.71 % 55.00 % BSK E-New Holding company KOREA 81.47 % 80.86 % e-New Holding company KOREA 75.92 % 75.36 % Songhyun e-New Holding company KOREA 80.45 % 79.85 % PT. Korea Energy Indonesia Utility plant maintenance and others INDONESIA — 95.00 % KOLAT SpA Utility plant maintenance and others CHILE — 100.00 % KEPCO California, LLC Holding company USA — 100.00 % KEPCO Mojave Holdings, LLC Holding company USA — 100.00 % Incheon Fuel Cell Co., Ltd. Power generation KOREA — 60.00 % KOEN Service Co., Ltd. Facility maintenance and service KOREA — 100.00 % KOMIPO Service Co., Ltd. Facility maintenance and service KOREA — 100.00 % KOWEPO Service Co., Ltd. Facility maintenance and service KOREA — 100.00 % KOSPO Service Co., Ltd. Facility maintenance and service KOREA — 100.00 % EWP Service Co., Ltd. Facility maintenance and service KOREA — 100.00 % PT. KOMIPO Energy Indonesia Utility plant maintenance and others INDONESIA — 95.00 % (*1) Considering treasury stocks, the effective percentage of ownership is 66.08%. (*2) These subsidiaries are included in the consolidated financial statements as the Company obtained the majority of the voting power through the shareholders’ agreement. (*3) As of reporting date, the annual reporting period of all subsidiaries is December 31, except for Mira Power Limited which is November 30. (*4) The effective percentage of ownership has increased to 86.22% since Long Lasting Value exercised the put option to sell its investment to KOSEP during the year ended December 31, 2017. (*5) 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. (*6) KOWEPO India Private Limited was in the process of liquidating its business as of December 31, 2018 and has been reclassified to assets held-for-sale, (2) Subsidiaries newly included in or excluded from consolidation for the year ended December 31, 2018 are as follows: Subsidiaries included in consolidation during the year ended December 31, 2018. Subsidiary Reason PT. Korea Energy Indonesia Newly established KOLAT SpA Newly established KEPCO California, LLC Newly established KEPCO Mojave Holdings, LLC Newly established Incheon Fuel Cell Co., Ltd. Newly established KOEN Service Co., Ltd. Newly established KOMIPO Service Co., Ltd. Newly established KOWEPO Service Co., Ltd. Newly established KOSPO Service Co., Ltd. Newly established EWP Service Co., Ltd. Newly established PT. KOMIPO Energy Indonesia Newly established Subsidiaries excluded from consolidation during the year ended December 31, 2018. Subsidiary Reason KEPCO Canada Energy Ltd. Liquidated Cogentrix Solar Services, LLC Liquidated Solar Investments I, LLC Liquidated PT KEPCO Resource Indonesia Liquidated KOWEPO India Private Limited Liquidating (3) Summary of financial information of consolidated subsidiaries as of and for the years ended December 31, 2017 and 2018 are as follows: 2017 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the period In millions of won Korea Hydro & Nuclear Power Co., Ltd. ￦ 55,011,096 29,252,816 9,415,751 854,346 Korea South-East Power Co., Ltd. 9,879,577 4,844,184 5,387,846 130,371 Korea Midland Power Co., Ltd. 9,893,822 6,148,173 4,167,009 104,591 Korea Western Power Co., Ltd. 9,660,426 5,739,534 4,199,079 110,939 Korea Southern Power Co., Ltd. 9,648,741 5,401,216 4,397,552 98,817 Korea East-West Power Co., Ltd. 8,855,518 4,204,187 4,644,330 217,599 KEPCO Engineering & Construction Company, Inc. 762,166 305,134 490,193 21,222 KEPCO Plant Service & Engineering Co., Ltd. 1,195,086 294,689 1,232,113 135,482 KEPCO Nuclear Fuel Co., Ltd. 792,187 421,088 279,664 4,557 KEPCO KDN Co., Ltd. 524,520 155,715 619,470 48,968 Garolim Tidal Power Plant Co., Ltd. 619 345 — (12 ) KEPCO International HongKong Ltd. 153,529 1 — 4,380 KEPCO International Philippines Inc. 102,323 886 — 47,201 KEPCO Gansu International Ltd. 11,567 493 — (29 ) KEPCO Philippines Holdings Inc. 127,922 2,621 — 43,218 KEPCO Philippines Corporation 6,293 114 — 2,098 KEPCO Ilijan Corporation 474,624 57,801 109,183 66,320 KEPCO Lebanon SARL 1,069 9,281 — (219 ) KEPCO Neimenggu International Ltd. 165,937 — — 500 KEPCO Shanxi International Ltd. 497,990 193,309 — 3,796 KOMIPO Global Pte Ltd. 225,411 1,497 — 21,858 KEPCO Canada Energy Ltd. 132 22 — (32 ) KEPCO Netherlands B.V. 114,911 49 — 17,309 KOREA Imouraren Uranium Investment Corp. 151,278 131 — 1,490 KEPCO Australia Pty., Ltd. 466,654 569 — (568 ) KOSEP Australia Pty., Ltd. 27,076 333 12,096 1,601 KOMIPO Australia Pty., Ltd. 31,441 4,691 12,096 1,133 KOWEPO Australia Pty., Ltd. 31,586 4,691 12,096 1,232 KOSPO Australia Pty., Ltd. 29,472 4,221 12,096 (2,759 ) KEPCO Middle East Holding Company 95,812 90,842 — 2,913 Qatrana Electric Power Company 460,206 327,401 18,892 23,310 KHNP Canada Energy, Ltd. 51,994 31 — (92 ) KEPCO Bylong Australia Pty., Ltd. 242,364 277,549 — 20,271 Korea Waterbury Uranium Limited Partnership 20,886 136 — (59 ) Korea Electric Power Nigeria Ltd. 238 76 2,164 29 KEPCO Holdings de Mexico 235 30 — (20 ) KST Electric Power Company 546,242 478,230 120,126 16,154 KEPCO Energy Service Company 1,793 451 6,773 976 KEPCO Netherlands S3 B.V. 46,642 53 — 2,382 PT. KOMIPO Pembangkitan Jawa Bali 11,261 4,769 20,956 4,666 PT. Cirebon Power Service 2,808 155 7,439 592 2017 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the period In millions of won KOWEPO International Corporation ￦ — 8 — (2 ) KOSPO Jordan LLC 24,077 13,594 7,331 953 EWP Philippines Corporation 1,708 836 — (17 ) EWP America Inc.(*1) 79,854 67,308 23,543 (9,737 ) KNF Canada Energy Limited 1,884 31 — (43 ) PT KEPCO Resource Indonesia 491 — — (311 ) EWP Barbados 1 SRL 235,096 450 — (2,585 ) Gyeonggi Green Energy Co., Ltd. 282,408 199,160 95,192 3,203 PT. Tanggamus Electric Power 179,317 160,144 34,281 4,640 Gyeongju Wind Power Co., Ltd. 112,279 82,124 7,219 2,400 KOMIPO America Inc. 10,505 521 — 2,071 KOSEP USA, INC. 184 9,065 — 26,997 PT. EWP Indonesia 2,035 23 — 1,916 KEPCO Netherlands J3 B.V. 122,612 76 — 12,115 Korea Offshore Wind Power Co., Ltd. 190,195 1,985 — (6,997 ) Global One Pioneer B.V. 151 38 — (80 ) Global Energy Pioneer B.V. 309 41 — (87 ) Mira Power Limited 208,150 163,198 — 737 KOSEP Material Co., Ltd. 2,751 1,448 3,128 320 Commerce and Industry Energy Co., Ltd. 99,129 87,926 30,577 (749 ) KEPCO Singapore Holdings Pte., Ltd. 3,265 4 — (24 ) KOWEPO India Private Limited 781 — — (46 ) KEPCO KPS Philippines Corp. 6,636 235 6,840 555 KOSPO Chile SpA 133,570 50,109 — 1,066 PT. KOWEPO Sumsel Operation And Maintenance Services 1,350 279 7,651 659 HeeMang Sunlight Power Co., Ltd. 6,876 3,395 105 (229 ) Fujeij Wind Power Company 165,636 156,099 — 8,836 KOSPO Youngnam Power Co.,Ltd. 412,785 333,302 68,973 939 HI Carbon Professional Private Special Asset Investment Trust 1 3,002 — — 12 Chitose Solar Power Plant LLC 136,098 121,622 7,083 4,100 KEPCO Energy Solution Co. Ltd. 313,401 12,376 5,544 1,325 Solar School Plant Co., Ltd. 201,482 599 67 874 KOSPO Power Services Limitada 3,901 887 11,067 666 Energy New Industry Specialized Investment Private Investment Trust(*3) 506,207 2,118 — 52 KOEN Bylong Pty., Ltd. 5,875 — — — KOMIPO Bylong Pty., Ltd. 5,875 — — — KOWEPO Bylong Pty., Ltd. 5,875 — — — KOSPO Bylong Pty., Ltd. 5,875 — — — EWP Bylong Pty., Ltd. 5,875 — — — KOWEPO Lao International 3,259 1,452 3,624 1,881 KEPCO US Inc. 16,913 — — — KEPCO Alamosa LLC 33,144 492 — (218 ) Cogentrix Solar Services, LLC(*2) 84,458 53,116 8,958 (112 ) 2017 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the period In millions of won KEPCO-LG ￦ 24,131 24,395 — (278 ) Mangilao Investment LLC 24,131 — — — KEPCO-LG 24,002 134 — (278 ) Jeju Hanlim Offshore Wind Co., Ltd. 36 — — — PT. Siborpa Eco Power 11,562 214 — (518 ) (*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 Cogentrix Solar Services, LLC includes that of two other subsidiaries, Solar Investments I, LLC and KEPCO Solar of Alamosa, LLC (formerly, Cogentrix of Alamosa, LLC). (*3) Financial information of Energy New Industry Specialized Investment Private Investment Trust includes that of three other subsidiaries, BSK E-New e-New e-New 2018 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the period 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 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 ) 2018 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the period In millions of won 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 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 HI Carbon Professional Private Special Asset Investment Trust 1 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 ) 2018 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the period In millions of won Mangilao Investment LLC ￦ 25,641 — — — KEPCO-LG 25,406 146 — (104 ) 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 (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. 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. 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. (5) Details of non-controlling 2016 Description KEPCO Ilijan KEPCO Plant KEPCO Construction Others Total In millions of won Percentage of ownership 49.00 % 49.00 % 33.92 % Current assets ￦ 154,758 553,924 270,553 1,211,510 2,190,745 Non-current assets 403,272 532,497 516,043 2,379,882 3,831,694 Current liabilities (19,256 ) (264,506 ) (286,444 ) (297,510 ) (867,716 ) Non-current liabilities (39,193 ) (36,984 ) (78,232 ) (1,919,924 ) (2,074,333 ) Net assets 499,581 784,931 421,920 1,373,958 3,080,390 Book value of non-controlling interest 244,794 384,616 143,115 684,093 1,456,618 Sales 116,667 1,214,304 506,012 674,461 2,511,444 Profit for the period 51,552 86,657 17,796 102,170 258,175 Profit for the period attributable to non-controlling interest 25,260 42,462 6,036 26,709 100,467 Cash flows from operating activities 102,546 121,240 18,748 84,086 326,620 Cash flows from investing activities (117 ) 79,807 (7,556 ) (367,674 ) (295,540 ) Cash flows from financing activities before dividends to non-controlling interest (56,863 ) (39,911 ) (1,634 ) 877,863 779,455 Dividends to non-controlling interest (55,705 ) (36,139 ) (2,539 ) (22,054 ) (116,437 ) Effect of exchange rate fluctuation 1,529 127 (854 ) 7,216 8,018 Net increase (decrease) of cash and cash equivalents (8,610 ) 125,124 6,165 579,437 702,116 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 ) (6) Changes in goodwill (i) Details of goodwill as of December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Acquisition cost ￦ 2,582 2,582 Accumulated impairment — — Carrying book value ￦ 2,582 2,582 (ii) There are no changes in goodwill for the years ended December 31, 2017 and 2018. (7) Disposals of subsidiaries KEPCO Canada Uranium Investment Limited Partnership was dissolved and the Company liquidated DG Kings Plaza, LLC during the year ended December 31, 2016. Also, the Company liquidated KEPCO Canada Energy Ltd., Cogentrix Solar Services, LLC, Solar Investments I, LLC, and PT KEPCO Resource Indonesia during the year ended December 31, 2018. (i) The fair value of proceeds from disposal as of December 31, 2016, 2017 and 2018, respectively, are as follows: 2016 2017 2018 In millions of won Consideration received in cash ￦ 898 — 160 Net assets transferred due to dissolution or liquidation 34,148 — — ￦ 35,046 — 160 (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, 2016, 2017 and 2018, respectively, are as follows: 2016 2017 2018 In millions of won Current assets Cash and cash equivalents ￦ 898 — 175 Current financial assets 81 — — Trade and other receivables — — 11 Non-current Available-for-sale 34,089 — — Current liabilities Current financial liabilities (22 ) — — Trade and other payables — — (28 ) ￦ 35,046 — 158 (iii) Gain from disposals of subsidiaries for the years ended December 31, 2016, 2017 and 2018, respectively, are as follows: 2016 2017 2018 In millions of won Fair value of sale price ￦ 35,046 — 160 Net assets disposed (35,046 ) — (158 ) Non-controlling — — — Realization of unrealized gain — — 70 Other comprehensive income — — — Gain from disposals of subsidiaries(*1) ￦ — — 72 (*1) Gain from disposals of subsidiaries is included in the consolidated statements of comprehensive income (loss). (iv) Net cash flow from sales of subsidiaries for the years ended December 31, 2016, 2017 and 2018, respectively, are as follows: 2016 2017 2018 In millions of won Consideration received in cash ￦ 898 — 160 Less: cash held by disposed subsidiaries (898 ) — (175 ) Net cash flow ￦ — — (15 ) (8) Cash dividends received from subsidiaries for the years ended December 31, 2016, 2017 and 2018, respectively, are as follows: Subsidiaries 2016 2017 2018 In millions of won Korea Hydro & Nuclear Power Co., Ltd. ￦ 635,200 543,072 281,234 Korea South-East Power Co., Ltd. 124,169 106,546 33,928 Korea Midland Power Co., Ltd. 23,073 54,305 26,581 Korea Western Power Co., Ltd. 36,238 66,992 28,996 Korea Southern Power Co., Ltd. 17,849 60,630 25,780 Korea East-West Power Co., Ltd. 67,906 94,430 61,408 KEPCO Engineering & Construction Company, Inc. 5,069 2,765 5,531 KEPCO Plant Service & Engineering Co., Ltd. 39,911 15,607 33,739 KEPCO Nuclear Fuel Co., Ltd. 3,411 3,231 1,077 KEPCO KDN Co., Ltd. 3,392 4,352 13,888 KEPCO International HongKong Ltd. 9,107 4,304 23,314 KEPCO International Philippines Inc. 61,862 44,906 52,507 KEPCO Ilijan Corporation 57,979 50,849 53,900 KEPCO Philippines Holdings Inc. 17,747 26,023 — KEPCO Neimenggu International Ltd. 10,735 — — KOMIPO Global Pte Ltd. 10,432 — — Qatrana Electric Power Company 8,331 5,939 6,240 KOSPO Jordan LLC 1,095 — — KEPCO Energy Service Company 294 — — EWP Philippines Corporation — — — KEPCO Netherlands S3 B.V. — — 3,115 PT. KOMIPO Pembangkitan Jawa Bali 3,222 3,188 20,658 KEPCO Netherlands J3 B.V. 12,507 — 12,090 Gyeongju Wind Power Co., Ltd. 679 — — Energy New Industry Specialized Investment Private Investment Trust — 291 — HI Carbon Professional Private Special Asset Investment Trust 1 — 11 11 KOSPO Power Services Limitada — 425 993 Cogentrix Solar Services, LLC — 344 — KEPCO Netherlands B.V. — — 17,424 PT. Cirebon Power Service — — 382 Chitose Solar Power Plant LLC — — 1,986 ￦ 1,150,208 1,088,210 704,782

Investments in Associates and J

Investments in Associates and Joint Ventures	12 Months Ended
	Dec. 31, 2018
Investments in Associates and Joint Ventures [Abstract]
Investments in Associates and Joint Ventures	20. Investments in Associates and Joint Ventures (1) Investments in associates and joint ventures as of December 31, 2017 and 2018 are as follows: 2017 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 1,618,868 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 40,606 Cheongna Energy Co., Ltd. Generating and distributing vapor and hot/cold water KOREA 43.90 % 48,353 8,337 Gangwon Wind Power Co., Ltd.(*2) Power generation KOREA 15.00 % 5,725 13,855 Hyundai Green Power Co., Ltd. Power generation KOREA 29.00 % 88,885 114,806 Korea Power Exchange(*5) Management of power market and others KOREA 100.00 % 127,839 237,631 AMEC Partners Korea Ltd.(*3) Resources development KOREA 19.00 % 707 215 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 5,319 Taeback Guinemi Wind Power Co., Ltd. Power generation KOREA 25.00 % 3,420 3,089 Pyeongchang Wind Power Co., Ltd. Power generation KOREA 25.00 % 3,875 4,136 Daeryun Power Co., Ltd.(*3, 9) Power generation KOREA 13.13 % 25,477 25,113 Changjuk Wind Power Co., Ltd. Power generation KOREA 30.00 % 3,801 7,515 KNH Solar Co., Ltd. Power generation KOREA 27.00 % 1,296 2,218 SPC Power Corporation Power generation PHILIPPINES 38.00 % 20,635 52,283 Gemeng International Energy Co., Ltd. Power generation CHINA 34.00 % 413,153 649,973 PT. Cirebon Electric Power Power generation INDONESIA 27.50 % 40,365 97,410 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 29,403 PT. Bayan Resources TBK Resources development INDONESIA 20.00 % 615,860 451,831 S-Power Power generation KOREA 49.00 % 132,300 116,945 Pioneer Gas Power Limited(*7) Power generation INDIA 38.50 % 49,831 38,659 Eurasia Energy Holdings Power generation and resources development RUSSIA 40.00 % 461 — Xe-Pian Xe-Namnoy Power generation LAOS 25.00 % 71,481 61,779 Hadong Mineral Fiber Co., Ltd.(*3) Recycling fly ashes KOREA 8.33 % 50 — Green Biomass Co., Ltd.(*11, 14) Power generation KOREA 8.80 % 714 208 PT. Mutiara Jawa Manufacturing and operating floating coal terminal INDONESIA 29.00 % 2,978 — Samcheok Eco Materials Co., Ltd.(*10) Recycling fly ashes KOREA 2.35 % 686 — Noeul Green Energy Co., Ltd. Power generation KOREA 29.00 % 1,740 2,067 Naepo Green Energy Co., Ltd. Power generation KOREA 41.67 % 29,200 20,598 Goseong Green Energy Co., Ltd.(*2) Power generation KOREA 1.12 % 2,900 2,597 Gangneung Eco Power Co., Ltd.(*2) Power generation KOREA 1.61 % 2,900 2,583 Shin Pyeongtaek Power Co., Ltd. Power generation KOREA 40.00 % 43,920 34,903 Heang Bok Do Si Photovoltaic Power Co., Ltd. Power generation KOREA 28.00 % 194 187 Dongducheon Dream Power Co., Ltd. Power generation KOREA 33.61 % 111,134 53,233 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 3,476 Daegu Photovoltaic Co., Ltd. Power generation KOREA 29.00 % 1,230 1,718 Jeongam Wind Power Co., Ltd. Power generation KOREA 40.00 % 5,580 3,763 Korea Power Engineering Service Co., Ltd. Construction and service KOREA 29.00 % 290 3,659 Busan Green Energy Co., Ltd. Power generation KOREA 29.00 % 5,243 7,363 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 % 2,604 1,749 Ulleungdo Natural Energy Co., Ltd. Renewable power generation KOREA 29.85 % 8,000 6,370 Korea Nuclear Partners Co., Ltd. Electric material agency KOREA 29.00 % ￦ 290 383 Tamra Offshore Wind Power Co., Ltd. Power generation KOREA 27.00 % 8,910 8,560 Korea Electric Power Corporation Fund(*12) Developing electric enterprises KOREA 98.09 % 51,500 47,974 Energy Infra Asset Management Co., Ltd.(*3) Asset management KOREA 9.90 % 297 476 Daegu clean Energy Co., Ltd. Renewable power generation KOREA 28.00 % 140 11 YaksuESS Co., Ltd Installing ESS related equipment KOREA 29.00 % 210 194 Nepal Water & Energy Development Company Private Limited(*15) Construction and operation of utility plant NEPAL 62.13 % 33,577 30,498 Gwangyang Green Energy Co., Ltd. Power generation KOREA 20.00 % 2,000 1,772 PND solar., Ltd Power generation KOREA 29.00 % 1,250 1,250 2,240,761 3,837,421 <Joint ventures> KEPCO-Uhde Inc.(*6) Power generation KOREA 52.80 % 11,355 258 Eco Biomass Energy Sdn. Bhd.(*6) Power generation MALAYSIA 61.53 % 14,439 — Datang Chaoyang Renewable Power Co., Ltd. Power generation CHINA 40.00 % 27,660 27,262 Shuweihat Asia Power Investment B.V. Holding company NETHERLANDS 49.00 % 46,037 15,675 Shuweihat Asia Operation & Maintenance Company(*6) Maintenance of utility plant CAYMAN 55.00 % 30 663 Waterbury Lake Uranium L.P. Resources development CANADA 35.76 % 26,602 19,781 ASM-BG Power generation BULGARIA 50.00 % 16,101 21,202 RES Technology AD Power generation BULGARIA 50.00 % 15,595 14,375 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 % 94,579 217,094 Gansu Datang Yumen Wind Power Co., Ltd. Power generation CHINA 40.00 % 16,621 10,840 Datang Chifeng Renewable Power Co., Ltd. Power generation CHINA 40.00 % 121,928 171,055 Datang KEPCO Chaoyang Renewable Power Co., Ltd. Power generation CHINA 40.00 % 10,858 11,060 Rabigh Electricity Company Power generation SAUDI ARABIA 40.00 % 109,743 99,356 Rabigh Operation & Maintenance Company Limited Maintenance of utility plant SAUDI ARABIA 40.00 % 70 3,987 Jamaica Public Service Company Limited Power generation JAMAICA 40.00 % 301,910 221,153 KW Nuclear Components Co., Ltd. Manufacturing KOREA 45.00 % 833 6,703 Busan Shinho Solar Power Co., Ltd. Power generation KOREA 25.00 % 2,100 4,346 GS Donghae Electric Power Co., Ltd. Power generation KOREA 34.00 % 204,000 220,727 Global Trade Of Power System Co., Ltd. Exporting products and technology of small or medium business by proxy KOREA 29.00 % 290 577 Expressway Solar-light Power Generation Co., Ltd. Power generation KOREA 29.00 % 1,856 2,463 KODE NOVUS I LLC Power generation USA 50.00 % 19,213 — KODE NOVUS II LLC Power generation USA 50.00 % 12,756 — Daejung Offshore Wind Power Co., Ltd. Power generation KOREA 49.90 % 5,190 2,969 Amman Asia Electric Power Company(*6) Power generation JORDAN 60.00 % 111,476 145,676 KAPES, Inc.(*6) R&D KOREA 51.00 % 5,629 7,476 Dangjin Eco Power Co., Ltd. Power generation KOREA 34.00 % 61,540 57,928 Honam Wind Power Co., Ltd. Power generation KOREA 29.00 % 3,480 4,302 Chun-cheon Energy Co., Ltd. Power generation KOREA 29.90 % 52,700 48,118 Yeonggwangbaeksu Wind Power Co., Ltd.(*3) Power generation KOREA 15.00 % 3,000 2,734 Nghi Son 2 Power LLC Power generation VIETNAM 50.00 % 2,781 183 Kelar S.A(*6) Power generation CHILE 65.00 % 77,220 67,233 PT. Tanjung Power Indonesia Power generation INDONESIA 35.00 % 746 1,776 Incheon New Power Co., Ltd. Power generation KOREA 29.00 % 461 619 Seokmun Energy Co., Ltd. Power generation KOREA 29.00 % ￦ 15,370 13,786 Daehan Wind Power PSC Power generation JORDAN 50.00 % 285 — Barakah One Company(*13) Power generation UAE 18.00 % 118 626 Nawah Energy Company(*13) Operation of utility plant UAE 18.00 % 296 258 MOMENTUM International thermonuclear experimental reactor construction management FRANCE 33.33 % 1 391 Daegu Green Power Co., Ltd. Power generation KOREA 29.00 % 46,225 42,391 Yeonggwang Wind Power Co., Ltd. Power generation KOREA 41.00 % 15,375 15,294 Chester Solar IV SpA(*6) Power generation CHILE 81.82 % 1,700 1,700 Chester Solar V SpA(*6) Power generation CHILE 81.82 % 525 525 Diego de Almagro Solar SpA(*6) Power generation CHILE 81.82 % 2,091 2,091 South Jamaica Power Company Limited Power generation JAMAICA 20.00 % 7,090 6,704 1,469,978 1,493,275 3,710,739 5,330,696 (*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 100%. However, according to the shareholders’ agreement, all critical financial and operating decisions must be agreed to by all ownership parties. For these reasons, 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, 2017, 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 effective percentage of ownership is 19.45% considering stock purchase options. (*10) The Company’s effective percentage of ownership excluding the redeemable convertible preferred stock is 25.54%. (*11) 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. (*12) 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. (*13) 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 (*14) The percentage of ownership decreased since the Company did not participate in the capital increase of Green Biomass Co., Ltd. during the period. (*15) 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. 2018 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 1,701,848 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. (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, 2017 and 2018 are as follows: Investees 2017 2018 In millions of won <Associates> Korea Electric Power Industrial Development Co., Ltd. ￦ 38,667 33,609 Korea Gas Corporation(*) 804,195 910,980 YTN Co., Ltd. 18,855 18,900 SPC Power Corporation 72,616 72,710 PT. Bayan Resources TBK 558,267 1,017,601 (*) The carrying amount of Korea Gas Corporation (“KOGAS”) is ￦1,701,848 million as of December 31, 2018 and management has determined that there is objective evidence of impairment. As a result of the impairment test, the Company has not recognized any impairment loss as the value in use is greater than the carrying amount. The recoverable amount of KOGAS based on its value in use is calculated by considering the long-term natural gas supply and demand programs of future cash flows approved by Ministry of Trade, Industry & Energy and the discount rate of 4.80%. (3) Changes in investments in associates and joint ventures for the years ended December 31, 2017 and 2018 are as follows: 2017 Investees Beginning Acquisition Disposal Dividends Share of Other (loss) Others Ending In millions of won <Associates> Korea Gas Corporation ￦ 1,933,877 — — — (242,232 ) (72,648 ) (129 ) 1,618,868 Korea Electric Power Industrial Development Co., Ltd. 20,475 — — (2,061 ) 3,428 102 (106 ) 21,838 YTN Co., Ltd. 38,156 — — (135 ) 1,095 929 561 40,606 Cheongna Energy Co., Ltd. 12,373 — — — (4,036 ) — — 8,337 Gangwon Wind Power Co., Ltd. 13,069 — — (852 ) 1,638 — — 13,855 Hyundai Green Power Co., Ltd. 115,998 — — (8,889 ) 7,697 — — 114,806 Korea Power Exchange 223,238 — — — 8,831 — 5,562 237,631 AMEC Partners Korea Ltd. 225 — — — (10 ) — — 215 Hyundai Energy Co., Ltd. 1,031 — — — (3,498 ) — 2,467 — Ecollite Co., Ltd. — — — — — — — — Taebaek Wind Power Co., Ltd. 4,750 — — — 569 — — 5,319 Taeback Guinemi Wind Power Co., Ltd. 3,131 — — — (42 ) — — 3,089 Pyeongchang Wind Power Co., Ltd. 3,383 — — — 753 — — 4,136 Daeryun Power Co., Ltd. 29,873 — — — (4,762 ) — 2 25,113 Changjuk Wind Power Co., Ltd. 6,930 — — (111 ) 696 — — 7,515 KNH Solar Co., Ltd. 2,073 — — — 145 — — 2,218 SPC Power Corporation 56,818 — — (5,562 ) 4,310 (3,276 ) (7 ) 52,283 Gemeng International Energy Co., Ltd. 680,065 — — (13,365 ) 6,953 (23,680 ) — 649,973 PT. Cirebon Electric Power 96,658 — — (550 ) 10,685 2,232 (11,615 ) 97,410 KNOC Nigerian East Oil Co., Ltd. — — — — (1,914 ) 1,536 378 — KNOC Nigerian West Oil Co., Ltd. — — — — (1,712 ) 1,407 305 — PT Wampu Electric Power 23,188 — — — 9,336 — (3,121 ) 29,403 PT. Bayan Resources TBK 402,667 — — — 34,122 14,982 60 451,831 S-Power 123,912 — — — (6,982 ) — 15 116,945 Pioneer Gas Power Limited 50,740 — — — (11,119 ) (1,238 ) 276 38,659 Eurasia Energy Holdings — — — — — — — — Xe-Pian Xe-Namnoy 51,544 22,362 — — (4,264 ) (7,863 ) — 61,779 Hadong Mineral Fiber Co., Ltd. — — — — (31 ) — 31 — Green Biomass Co., Ltd. 47 — — — (112 ) — 273 208 PT. Mutiara Jawa — — — — — — — — Samcheok Eco Materials Co., Ltd. — — — — — — — — Noeul Green Energy Co., Ltd. 1,217 — — — 850 — — 2,067 Naepo Green Energy Co., Ltd.(*2) 25,438 — — — (1,400 ) — (3,440 ) 20,598 Goseong Green Energy Co., Ltd. 2,663 — — — (66 ) — — 2,597 Gangneung Eco Power Co., Ltd. 2,646 — — — (63 ) — — 2,583 Shin Pyeongtaek Power Co., Ltd. — 43,880 — — (10,998 ) (3,617 ) 5,638 34,903 Heang Bok Do Si Photovoltaic Power Co., Ltd. 181 — — — 6 — — 187 DS POWER Co., Ltd.(*4) 7,190 — — — (1,321 ) — (5,869 ) — Dongducheon Dream Power Co., Ltd.(*1,3) 46,876 — — — (10,980 ) — 17,337 53,233 KS Solar Co., Ltd. 604 — (613 ) — — 9 — — Jinbhuvish Power Generation Pvt. Ltd. — — — — — — — — SE Green Energy Co., Ltd. 3,525 — — — (49 ) — — 3,476 Daegu Photovoltaic Co., Ltd. 1,700 — — (349 ) 367 — — 1,718 Jeongam Wind Power Co., Ltd. 4,000 — — — (237 ) — — 3,763 Korea Power Engineering Service Co., Ltd. 2,810 — — (191 ) 1,030 — 10 3,659 Busan Green Energy Co., Ltd. ￦ 13,803 — (9,320 ) — 2,884 — (4 ) 7,363 Gunsan Bio Energy Co., Ltd. — — — — — — — — Korea Electric Vehicle Charging Service 1,103 1,008 — — (362 ) — — 1,749 Ulleungdo Natural Energy Co., Ltd. 6,894 — — — (524 ) — — 6,370 Korea Nuclear Partners Co., Ltd. 248 — — — 135 — — 383 Tamra Offshore Wind Power 7,015 — — — 1,545 — — 8,560 Korea Electric Power Corporation Fund 50,856 — — — (2,171 ) (711 ) — 47,974 Energy Infra Asset Management 259 — — — 217 — — 476 Daegu clean Energy Co., Ltd. 140 — — — (129 ) — — 11 YaksuESS Co., Ltd 196 — — — (2 ) — — 194 Nepal Water & Energy Development Company Private Limited 18,667 15,009 — — (677 ) (2,501 ) — 30,498 Gwangyang Green Energy Co., Ltd. — 2,000 — — (228 ) — — 1,772 PND solar., Ltd — 1,250 — — — — — 1,250 4,092,252 85,509 (9,933 ) (32,065 ) (212,629 ) (94,337 ) 8,624 3,837,421 <Joint ventures> KEPCO-Uhde Inc. 301 — — — (43 ) — — 258 Eco Biomass Energy Sdn. Bhd. — — — — — — — — Datang Chaoyang Renewable Power 28,239 — — (839 ) 840 (978 ) — 27,262 Shuweihat Asia Power Investment B.V. — — — (1,707 ) 4,275 12,457 650 15,675 Shuweihat Asia Operation & Maintenance Company 450 — — (770 ) 1,055 (172 ) 100 663 Waterbury Lake Uranium L.P. 21,314 — — — (23 ) (949 ) (561 ) 19,781 ASM-BG 21,488 — — (946 ) (150 ) 810 — 21,202 RES Technology AD 13,582 — — — 1,053 (260 ) — 14,375 KV Holdings, Inc. 2,098 — — — 61 (241 ) — 1,918 KEPCO SPC Power Corporation 245,367 — — (37,443 ) 42,359 (33,230 ) 41 217,094 Canada Korea Uranium Limited partnership — — — — — — — — Gansu Datang Yumen Wind Power 12,821 — — — (1,299 ) (682 ) — 10,840 Datang Chifeng Renewable Power 166,535 — — — 14,079 (9,559 ) — 171,055 Datang KEPCO Chaoyang Renewable Power Co., Ltd. 10,843 — — — 837 (620 ) — 11,060 Rabigh Electricity Company 97,802 — — (18,112 ) 35,769 (15,227 ) (876 ) 99,356 Rabigh Operation & Maintenance Company Limited 4,427 — — (2,130 ) 2,236 (546 ) — 3,987 Jamaica Public Service Company Limited 249,453 — — — — (28,300 ) — 221,153 KW Nuclear Components Co., Ltd. 7,133 — — (208 ) (222 ) — — 6,703 Busan Shinho Solar Power Co., Ltd. 3,814 — — (63 ) 595 — — 4,346 GS Donghae Electric Power Co., Ltd. 205,948 — — — 14,714 — 65 220,727 Global Trade Of Power System 477 — — — 100 — — 577 Expressway Solar-light Power Generation Co., Ltd. 2,343 — — — 120 — — 2,463 KODE NOVUS I LLC ￦ — — — — — — — — KODE NOVUS II LLC — — — — — — — — Daejung Offshore Wind Power 3,015 200 — — (246 ) — — 2,969 Amman Asia Electric Power Company 153,857 — — (12,213 ) 19,957 (15,925 ) — 145,676 KAPES, Inc. 4,758 — — — 2,752 — (34 ) 7,476 Dangjin Eco Power Co., Ltd. 53,253 5,440 — — (752 ) (3 ) (10 ) 57,928 Honam Wind Power Co., Ltd. 4,451 — — (487 ) 338 — — 4,302 Chun-cheon Energy Co., Ltd. 50,592 — — — (2,474 ) — — 48,118 Yeonggwangbaeksu Wind Power Co., Ltd. 2,689 — — — 45 — — 2,734 Nghi Son 2 Power LLC 229 993 — — (1,039 ) — — 183 Kelar S.A — 73,040 — — (633 ) (5,175 ) 1 67,233 PT. Tanjung Power Indonesia 1,946 — — — 2,112 (2,281 ) (1 ) 1,776 Incheon New Power Co., Ltd. 563 — — — 56 — — 619 Seokmun Energy Co., Ltd. 391 14,790 — — (1,219 ) (176 ) — 13,786 Daehan Wind Power PSC 16 — — — (40 ) 22 2 — Barakah One Company 116 — — — 570 (60 ) — 626 Nawah Energy Company 290 — — — (5 ) (27 ) — 258 MOMENTUM 67 — — — 321 3 — 391 Daegu Green Power Co., Ltd. 47,528 — — — (5,133 ) — (4 ) 42,391 Yeonggwang Wind Power Co., Ltd. — 15,375 — — (25 ) (56 ) — 15,294 Chester Solar IV SpA — 1,700 — — — — — 1,700 Chester Solar V SpA — 525 — — — — — 525 Diego de Almagro Solar SpA — 2,091 — — — — — 2,091 South Jamaica Power Company Limited — 7,090 — — — — (386 ) 6,704 1,418,196 121,244 — (74,918 ) 130,941 (101,175 ) (1,013 ) 1,493,275 ￦ 5,510,448 206,753 (9,933 ) (106,983 ) (81,688 ) (195,512 ) 7,611 5,330,696 (*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 ￦23,798 million in impairment loss on investments in associates and joint ventures for the year ended December 31,

Property, Plant and Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	21. Property, Plant and Equipment (1) Property, plant and equipment as of December 31, 2017 and 2018 are as follows: 2017 Acquisition cost Government grants Accumulated depreciation Accumulated losses Book value In millions of won Land ￦ 13,318,542 (21,968 ) — — 13,296,574 Buildings 18,777,678 (63,539 ) (6,722,376 ) (1,776 ) 11,989,987 Structures 66,184,484 (196,414 ) (22,071,667 ) (8,039 ) 43,908,364 Machinery 75,826,292 (183,188 ) (28,904,982 ) (45,512 ) 46,692,610 Ships 4,175 — (3,772 ) — 403 Vehicles 276,425 (6,322 ) (195,260 ) (127 ) 74,716 Equipment 1,440,870 (761 ) (1,020,192 ) (6 ) 419,911 Tools 1,010,537 (1,027 ) (809,842 ) (32 ) 199,636 Construction-in-progress 25,610,649 (49,084 ) — (38,108 ) 25,523,457 Finance lease assets 2,390,680 (27 ) (2,093,001 ) — 297,652 Asset retirement costs 9,395,821 — (3,356,337 ) — 6,039,484 Others 11,247,021 — (8,807,401 ) — 2,439,620 ￦ 225,483,174 (522,330 ) (73,984,830 ) (93,600 ) 150,882,414 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-progress 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 (2) Changes in property, plant and equipment for the years ended December 31, 2017 and 2018 are as follows: 2017 Beginning Acquisition Disposal Depreciation Impairment(*1) Others Ending balance In millions of won Land ￦ 12,969,741 32,773 (8,961 ) — — 324,989 13,318,542 (Government grants) (3,204 ) — 5 — — (18,769 ) (21,968 ) Buildings 11,784,624 40,592 (19,715 ) (794,804 ) (923 ) 1,043,752 12,053,526 (Government grants) (61,188 ) (900 ) 28 5,996 — (7,475 ) (63,539 ) Structures 43,330,415 428 (519,366 ) (2,421,168 ) (6,856 ) 3,721,325 44,104,778 (Government grants) (197,641 ) — 1,905 10,011 — (10,689 ) (196,414 ) Machinery 43,421,945 421,892 (242,428 ) (4,821,595 ) (43,121 ) 8,139,105 46,875,798 (Government grants) (111,064 ) (10,834 ) 489 17,390 — (79,169 ) (183,188 ) Ships 550 — — (147 ) — — 403 Vehicles 70,970 3,447 (174 ) (34,236 ) (127 ) 41,158 81,038 (Government grants) (107 ) (107 ) 14 1,070 — (7,192 ) (6,322 ) Equipment 376,395 53,529 (413 ) (158,614 ) (6 ) 149,781 420,672 (Government grants) (732 ) (43 ) — 454 — (440 ) (761 ) Tools 179,032 30,990 (166 ) (74,909 ) (32 ) 65,748 200,663 (Government grants) (430 ) — — 354 — (951 ) (1,027 ) Construction-in-progress 27,296,260 11,996,508 (6,487 ) — — (13,713,740 ) 25,572,541 (Government grants) (135,807 ) (42,728 ) — — — 129,451 (49,084 ) Finance lease assets 406,353 — (29,696 ) (107,390 ) — 28,412 297,679 (Government grants) — — — 1 — (28 ) (27 ) Asset retirement costs 4,065,412 — — (518,565 ) — 2,492,637 6,039,484 Others 2,351,532 10,411 (28 ) (762,711 ) — 840,416 2,439,620 ￦ 145,743,056 12,535,958 (824,993 ) (9,658,863 ) (51,065 ) 3,138,321 150,882,414 (*1) Korea Midland 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 impairment loss in the consolidated statements of comprehensive income. 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 impairment loss in the consolidated statements of comprehensive income. The amount includes impairment loss of ￦703,133 million in relation to Wolsong unit 1, and Shin-Hanul unit 3 and 4 as described in note 2, and the loss of ￦7,031 million due to fire at Taean unit 2. (*2) As described in note 29, the amount of acquisition of machinery includes ￦204,787 million of that the Company believes the possibility of economic 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

Investment Properties	12 Months Ended
	Dec. 31, 2018
Investment Properties [Abstract]
Investment Properties	22. Investment Properties (1) Investment properties as of December 31, 2017 and 2018 are as follows: 2017 Acquisition cost Government Accumulated Book value In millions of won Land ￦ 264,205 — — 264,205 Buildings 36,165 (83 ) (15,573 ) 20,509 ￦ 300,370 (83 ) (15,573 ) 284,714 2018 Acquisition cost 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 (2) Changes in investment properties for the years ended December 31, 2017 and 2018 are as follows: 2017 Beginning balance Depreciation Others Ending In millions of won Land ￦ 336,421 — (72,216 ) 264,205 Buildings 17,323 (1,178 ) 4,447 20,592 (Government grants) (64 ) 2 (21 ) (83 ) ￦ 353,680 (1,176 ) (67,790 ) 284,714 2018 Beginning balance 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 (3) Income and expenses related to investment properties for the years ended December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Rental income ￦ 9,581 9,494 Operating and maintenance expenses related to rental income (1,172 ) (923 ) ￦ 8,409 8,571 (4) Fair value of investment properties as of December 31, 2017 and 2018 are as follows: 2017 2018 Book value Fair value Book value Fair value In millions of won Land ￦ 264,205 309,241 139,940 167,178 Buildings 20,509 23,319 19,619 23,276 ￦ 284,714 332,560 159,559 190,454 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, 2018
Construction Services Contracts [Abstract]
Construction Services Contracts	23. Construction Services Contracts (1) Changes in total contract amount in which revenue is not yet recognized for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 Beginning balance Increase Recognized as revenue Ending In millions of won Nuclear power plant construction in UAE and others ￦ 12,308,839 (1,045,094 ) (4,026,857 ) 7,236,888 (*) For the year ended December 31, 2016, the increased balance of contracts from new orders and other is ￦718,118 million and the decreased balance of contracts due to changes in scope of construction work is ￦1,763,212 million. 2017 Beginning balance Increase (decrease)(*) 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. (2) Accumulated earned revenue, expense and others related to the Company’s construction contracts as of December 31, 2017 and 2018 are as follows: 2017 Accumulated earned revenue Accumulated expense Accumulated profit Unearned advance receipts In millions of won Nuclear power plant construction in UAE and others ￦ 18,236,992 16,937,772 1,299,220 — 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 — (3) Gross amount due from customers recognized as assets and due to customers recognized as liabilities for contract work as of December 31, 2017 and 2018 are as follows: 2017 2018 Assets(*1) Liabilities(*2) Assets(*1) Liabilities(*2) In millions of won Nuclear power plant construction in ￦ 55,755 542,921 36,232 350,460 (*1) Included in trade and other receivables, net, in the consolidated statements of financial position. (*2) Included in non-financial

Intangible Assets other than Go

Intangible Assets other than Goodwill	12 Months Ended
	Dec. 31, 2018
Intangible Assets other than Goodwill [Abstract]
Intangible Assets other than Goodwill	24. Intangible Assets other than Goodwill (1) Intangible assets as of December 31, 2017 and 2018 are as follows: 2017 Acquisition Government Accumulated Accumulated Book value In millions of won Software ￦ 534,191 (486 ) (408,300 ) — 125,405 Licenses and franchises 3,398 — (3,398 ) — — Copyrights, patents rights and other industrial rights 43,857 — (19,876 ) — 23,981 Mining rights 553,876 — (14,243 ) — 539,633 Development expenditures 836,996 (3,702 ) (752,478 ) — 80,816 Intangible assets under development 143,851 (10,540 ) — (3,941 ) 129,370 Usage rights of donated assets and other 459,682 (11 ) (358,024 ) — 101,647 Leasehold rights 24,306 — (19,262 ) — 5,044 Others 297,289 — (103,995 ) (12,069 ) 181,225 ￦ 2,897,446 (14,739 ) (1,679,576 ) (16,010 ) 1,187,121 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 (2) Changes in intangible assets for the years ended December 31, 2017 and 2018 are as follows: 2017 Beginning Acquisition Disposal Amortization Impairment Others Ending In millions of won Software ￦ 93,221 12,700 (5 ) (44,809 ) — 64,784 125,891 (Government grants) (595 ) (17 ) — 255 — (129 ) (486 ) Copyrights, patents rights and other industrial rights 20,081 30 (7 ) (3,350 ) — 7,227 23,981 Mining rights 538,860 26,751 (272 ) (4,640 ) — (21,066 ) 539,633 Development expenditures 62,405 494 — (25,924 ) — 47,543 84,518 (Government grants) (5,152 ) — — 2,811 — (1,361 ) (3,702 ) Intangible assets under development 115,533 56,527 — — (20 ) (32,130 ) 139,910 (Government grants) (11,090 ) — — — — 550 (10,540 ) Usage rights of donated assets and other 84,102 — — (14,462 ) — 32,018 101,658 (Government grants) (21 ) — — 10 — — (11 ) Leasehold rights 4,632 — — (545 ) — 957 5,044 Greenhouse gas emissions rights 6,283 — — — — (6,283 ) — Others 72,562 47,402 (377 ) (23,018 ) 54 84,602 181,225 (Government grants) — — — — — — — ￦ 980,821 143,887 (661 ) (113,672 ) 34 176,712 1,187,121 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 ) Licenses and franchises 23,981 28 — (8,665 ) (13 ) 51,781 67,112 Copyrights, patents rights and other industrial 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 (*) ￦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, is included. (3) Significant specific intangible assets as of December 31, 2017 and 2018 are as follows: 2017 Type Description Currency Amount Remaining useful lives In millions of won and thousands of Australian dollars Software ERP system and others KRW 1,135 3 years and 2 months ~ 3 years and 4 months AMI GATEWAY S/W KRW 3,528 3 years and 2 months Copyrights, patents rights and other industrial rights Smart technology verification and standard design project conducting right KRW 11,724 4 years and 9 months Mining rights Mining right of Bylong mine AUD 401,225 — (*) Development expenditures Electricity sales information system KRW 29,391 4 years and 3 months Intangible assets under development Contributions to ARP NRC DC KRW 46,458 — Usage rights of donated assets and others Sejong Haengbogdosi sharing charge Dangjin power plant load facility usage right KRW KRW 40,460 20,463 8 years and 11 months 3 years and 3 months Others Occupancy and use of public waters KRW 103,269 18 years and 11 months (*) Mining rights are amortized using the units-of-production 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 17 years and 11 months (*) Mining rights are amortized using the units-of-production (4) For the years ended December 31, 2016, 2017 and 2018, the Company recognized research and development expenses of 705,504 million, 721,437 million and 723,888 million, respectively.

Trade and Other Payables

Trade and Other Payables	12 Months Ended
	Dec. 31, 2018
Trade and Other Payables [Abstract]
Trade and Other Payables	25. Trade and Other Payables Trade and other payables as of December 31, 2017 and 2018 are as follows: 2017 2018 Current Non-current Current Non-current In millions of won Trade payables ￦ 2,936,990 — 3,411,830 — Other trade payables 1,649,933 2,825,039 1,630,860 2,626,876 Accrued expenses 1,087,844 1,951 1,127,796 1,859 Leasehold deposits received 1,562 1,308 1,949 1,084 Other deposits received 186,817 102,896 169,317 72,453 Finance lease liabilities 131,792 286,468 57,200 226,606 Dividends payable 4,448 — 6,443 — Others(*) 135 5,818 — 12,818 ￦ 5,999,521 3,223,480 6,405,395 2,941,696 (*) Details of others as of December 31, 2017 and 2018 are as follows: 2017 2018 Current Non-current Current Non-current In millions of won Advance received from local governments ￦ — 5,818 — 5,818 Others 135 — — 7,000 ￦ 135 5,818 — 12,818

Borrowings and Debt Securities

Borrowings and Debt Securities	12 Months Ended
	Dec. 31, 2018
Borrowings and Debt Securities [Abstract]
Borrowings and Debt Securities	26. Borrowings and Debt Securities (1) Borrowings and debt securities as of December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Current liabilities Short-term borrowings ￦ 1,038,328 860,602 Current portion of long-term borrowings 128,543 312,994 Current portion of debt securities 7,961,182 6,790,778 Less : Current portion of discount on long-term borrowings (886 ) (972 ) Less : Current portion of discount on debt securities (3,882 ) (1,974 ) Add : Current portion of premium on debt securities — 20 9,123,285 7,961,448 Non-current Long-term borrowings 2,455,737 3,280,015 Debt securities 43,270,825 49,905,077 Less : Discount on long-term borrowings (21,113 ) (22,000 ) Less : Discount on debt securities (81,424 ) (89,913 ) Add: Premium on debt securities 82 — 45,624,107 53,073,179 ￦ 54,747,392 61,034,627 (2) Repayment schedule of borrowings and debt securities as of December 31, 2017 and 2018 are as follows: 2017 Type Borrowings Debt Securities In millions of won Less than 1 year ￦ 1,166,871 7,961,182 1~ 5 years 1,117,222 25,047,075 Over 5 years 1,338,515 18,223,750 ￦ 3,622,608 51,232,007 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 (3) Short-term borrowings as of December 31, 2017 and 2018 are as follows: 2017 Type Creditor Interest rate (%) Maturity Foreign currency Local currency In millions of won and thousands of foreign currencies Local short-term 1.57~2.47 2018.01.12~ 2018.09.19 — ￦ 686,561 Foreign short-term SCNT and others 4.60~6.50 2018.12.03 USD 8,955 9,594 Foreign short-term Export-import Bank of 3M 2018.12.18 AUD 327,259 273,314 Local bank overdraft Nonghyup Bank 3.04 2018.01.02 — 51,300 Local bank overdraft Woori Bank Standard overdraft 2018.02.27 — 17,559 ￦ 1,038,328 2018 Type Creditor Interest rate (%) Maturity Foreign currency Local currency In millions of won and thousands of foreign currencies Local short-term 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 (*) 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, 201 7 8 2017 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 2018~2044 — ￦ 4,909 Facility 2.45~4.60 2023~2028 — 68,883 Facility 1yr KoFC bond rate +0.31 2018 — 25,000 Operating funds 2.59~3.04 2018~2020 — 47,000 Operating funds 1yr KoFC bond 2020 — 14,000 KEB Hana Bank Commercial Paper 3M CD+0.24~0.32 2021~2022 — 400,000 Facility 4.60 2028 — 15,038 Facility 3yr KTB rate-1.25 2018~2028 — 8,947 IBK PF Refinancing CD+1.25 2030 — 22,500 Export-Import Bank of Korea Project loans 1.50 2026 — 25,042 Operating funds 2.21 2020 — 35,000 Korea Energy Agency Development of power resources 3yr KTB rate-2.25 2023~2025 — 6,765 Facility 3yr KTB rate-2.25 2018~2024 — 3,121 Project loans — 2022~2025 — 3,733 Others KTB rate -2.25 2024~2028 — 18,455 Shinhan Bank Collateral borrowing 2.32 2019 — 30,000 Facility CB rate +1.10 2028 — 22,557 Operating funds 2.70 2018 — 15,000 Others 4.10 2035 — 105,000 Others Standard overdraft rate+1.10 2035 — 105,000 Kookmin Bank Facility 3.16 2020 — 10,000 Facility MOR+0.79 2023 — 35,000 Others Facility 1.75~4.60 2026~2029 — 148,423 Facility CB rate+1.10~1.20 2022~2028 — 46,278 PF Refinancing 4.10 2030 — 62,500 Others 4.50~8.00 2022~2039 — 102,346 1,380,497 Foreign long-term borrowings Korea Energy Agency Project loans — 2021~2023 USD 8,744 9,368 Export-Import Bank of Korea and others Direct loan and others 1M Libor+1.80~ 3.20 2036 USD 64,913 69,548 Direct loan and others 3M Libor+2.75~ 3.70 2027 JOD 168,663 254,514 Commercial loan and others 3M Libor+1.50~ 2.50 2030~2033 USD 289,026 309,662 PF Loan 6M Libor+1.70~ 2.50 2032 USD 123,253 132,054 SCNT and others Shareholder’s loan 6.50~8.00 2023 USD 41,718 ￦ 44,697 Shareholder’s loan 8.00 2031 JOD 5,136 7,750 PT PJB Shareholder’s loan 12.75 2019 IDR 10,932,568 864 Samsung Life Insurance and others Syndicated Loan 3.10 2032 JPY 5,325,000 50,540 Woori Bank and others Syndicated Loan JPY 6M Libor+2.00 2032 JPY 3,435,000 32,602 SMBC and others Equity Bridge Loan 1M Libor+0.90 2019 USD 70,986 76,054 IFC and others Others 6M Libor+5.00 2031 PKR 16,652,350 161,195 Federal Financing Bank PF loan 2.39 2031 USD 48,366 51,819 Others Others — 2019 USD 2,907 3,116 1,203,783 2,584,280 Less : Discount of long-term borrowings (21,999 ) Less : Current portion of long-term borrowings (128,543 ) Add : Current portion of discount on long-term borrowings 886 ￦ 2,434,624 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 rate +0.95 2020 — 14,000 KEB 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 rate+1.00 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 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 Others 3.88 2021 USD 278,105 310,427 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 of 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 (5) Local debt securities as of December 31, 2017 and 2018 are as follows: Issue date Maturity Interest rate (%) 2017 2018 In millions of won Electricity Bonds 2009.12.03~ 2018.12.04 2019.01.08~ 2048.10.29 1.62~5.45 ￦ 20,700,000 24,480,000 Electricity Bonds 2013.06.25 2018.06.25 3M CD+0.31 150,000 — Corporate Bonds(*1) 2009.05.04~ 2018.11.09` 2019.01.21~ 2048.11.09 1.36~6.00 21,122,708 23,223,228 41,972,708 47,703,228 Less : Discount on local debt securities (37,816 ) (41,247 ) Less : Current portion of local debt securities (5,200,000 ) (5,330,000 ) Add : Current portion of discount on local debt securities 923 1,035 ￦ 36,735,815 42,333,016 (*1) 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, 2017 and 2018 are as follows: 2017 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 249,070 ￦ 266,854 FY-97 1997.01.31~ 1997.08.04 2027.02.01~ 2027.08.01 6.75~7.00 USD 314,717 337,188 FY-04 2004.04.23 2034.04.23 5.13 USD 286,920 307,406 FY-08 2008.11.27 2018.11.27 4.19 JPY 20,000,000 189,822 FY-11 2011.07.13 2021.07.13 4.75 USD 500,000 535,700 FY-12 2012.09.19 2022.09.19 3.00 USD 750,000 803,550 FY-13 2013.02.05~ 2013.11.27 2018.02.05~ 2018.11.27 1.88~2.88 USD 1,900,000 2,035,660 FY-13 2013.09.26~ 2013.10.23 2019.03.26~ 2019.04.23 1.50~1.63 CHF 400,000 437,888 FY-13 2013.09.25 2020.09.25 5.75 AUD 325,000 271,427 FY-13 2013.02.20~ 2013.07.25 2018.02.20~ 2018.07.25 3M Libor+0.84~1.50 USD 500,000 535,700 FY-14 2014.02.11~ 2014.12.02 2019.02.11~ 2029.07.30 2.38~3.57 USD 1,500,000 1,607,100 FY-15 2015.06.15 2025.06.15 3.25 USD 300,000 321,420 FY-16 2016.01.21 2021.07.21 2.50 USD 300,000 321,420 FY-17 2017.04.12~ 2017.07.25 2020.04.12~ 2027.07.25 2.38~3.13 USD 1,100,000 1,178,540 FY-17 2017.10.30 2037.10.30 1.70 EUR 40,000 51,170 FY-17 2017.11.16 2037.11.16 2.36 SEK 450,000 58,454 9,259,299 Less : Discount on foreign debt securities (47,490 ) Add : Premium on foreign debt securities 82 Less : Current portion of foreign debt securities (2,761,182 ) Add : Current portion of discount on foreign debt securities 2,959 ￦ 6,453,668 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 (7) Changes in borrowings and debt securities for the years ended December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Beginning balance ￦ 53,639,205 54,747,392 Cash flow 2,269,513 5,972,336 Effect of exchange rate fluctuations (1,169,418 ) 322,515 Others 8,092 (7,616 ) Ending balance ￦ 54,747,392 61,034,627

Finance Lease Liabilities

Finance Lease Liabilities	12 Months Ended
	Dec. 31, 2018
Finance Lease Liabilities [Abstract]
Finance Lease Liabilities	27. Finance Lease Liabilities (1) Lease contracts The Company entered into power purchase agreements (“PPA”) with GS EPS and two other providers. The Company recognizes these PPAs as finance leases; under the PPAs, there is no transfer of ownership or bargain purchase option of the plants at the end of the agreement, however, the present value of the future minimum power purchase payments equals substantially all of the plants’ respective fair values over a twenty-year period which makes up the major part of the respective plant’s economic life. (2) Finance lease liabilities as of December 31, 2017 and 2018 are as follows and are included in current and non-current 2017 2018 Minimum lease Present value of Minimum lease Present value of In millions of won Less than 1 year ￦ 174,534 131,792 87,709 57,200 1 ~ 5 years 272,994 204,069 228,783 170,676 More than 5 years 108,748 82,399 65,250 55,930 ￦ 556,276 418,260 381,742 283,806 (3) Current and non-current 2017 2018 In millions of won Current finance lease liabilities ￦ 131,792 57,200 Non-current 286,468 226,606 ￦ 418,260 283,806 (4) Minimum lease payment and contingent rent payment recognized as an expense as a lessee for the years ended December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Minimum lease payment ￦ 158,859 111,530 Contingent rent payment (21,024 ) (18,872 ) (5) Changes in finance lease liabilities for the years ended December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Beginning balance ￦ 541,179 418,260 Cash flow (122,919 ) (134,454 ) Acquisition of finance lease assets — — Ending balance ￦ 418,260 283,806

Employment Benefits

Employment Benefits	12 Months Ended
	Dec. 31, 2018
Employment Benefits [Abstract]
Employment Benefits	28. Employment Benefits (1) Employment benefit obligations as of December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Net defined benefit obligations ￦ 1,476,201 1,638,785 Other long-term employee benefit obligations 6,868 6,284 ￦ 1,483,069 1,645,069 (2) Principal assumptions on actuarial valuation as of December 31, 2017 and 2018 are as follows: 2017 2018 Discount rate 2.75%~2.90% 2.24%~2.90% Future salary and benefit levels 4.88% 4.88% Weighted average duration 13.40 years 13.71 years (3) Details of expense relating to defined benefit plans for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 2017 2018 In millions of won Current service cost ￦ 378,930 392,820 369,899 Interest cost 67,104 79,524 87,687 Expected return on plan assets (23,612 ) (31,307 ) (42,135 ) Loss from settlement (706 ) (1,055 ) (767 ) ￦ 421,716 439,982 414,684 Expenses as described above are recognized in those items below in the financial statements. 2016 2017 2018 In millions of won Cost of sales ￦ 312,391 332,249 308,672 Selling and administrative expenses 61,362 59,111 51,903 Others (Construction-in-progress 47,963 48,622 54,109 ￦ 421,716 439,982 414,684 In addition, for the years ended December 31, 2016, 2017 and 2018, employee benefit obligations expenses of ￦62,435 million, ￦65,603 million and ￦66,833 million, respectively, are recognized as cost of sales, and ￦11,450 million, ￦11,983 million and ￦13,204 million, respectively, are recognized as selling and administrative expenses, and ￦14,024 million, ￦13,332 million and ￦14,189 million, respectively, are recognized as construction-in-progress (4) Details of defined benefit obligations as of December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Present value of defined benefit obligation from funded plans ￦ 2,951,842 3,414,116 Fair value of plan assets (1,475,641 ) (1,775,331 ) 1,476,201 1,638,785 Present value of defined benefit obligation from unfunded plans — — Net liabilities incurred from defined benefit plans ￦ 1,476,201 1,638,785 (5) Changes in the present value of defined benefit obligations for the years ended December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Beginning balance ￦ 2,867,377 2,951,842 Current service cost 392,820 369,899 Interest cost(*) 79,524 87,687 Remeasurement component (258,223 ) 154,939 Loss from settlement (1,055 ) (767 ) Actual payments (128,707 ) (149,454 ) Others 106 (30 ) Ending balance ￦ 2,951,842 3,414,116 (*) Corporate bond (AAA rated) yield at year-end (6) Changes in the fair value of plan assets for the years ended December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Beginning balance ￦ 1,188,907 1,475,641 Expected return 31,307 42,135 Remeasurement component (10,435 ) (12,308 ) Contributions by the employers 325,080 330,064 Actual payments (59,218 ) (60,201 ) Ending balance ￦ 1,475,641 1,775,331 In addition, loss on accumulated remeasurement component amounting to ￦43,513 million and ￦219,381 million has been recognized as other comprehensive income or loss for the years ended December 31, 2017 and 2018, respectively. (7) Details of the fair value of plan assets as of December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Equity instruments ￦ 79,204 96,823 Debt instruments 517,040 510,184 Bank deposit 293,477 275,518 Others 585,920 892,806 ￦ 1,475,641 1,775,331 For the years ended December 31, 2017 and 2018, actual returns on plan assets amounted to ￦20,782 million and ￦29,827 million, respectively. (8) Remeasurement component recognized in other comprehensive income (loss) for the years ended December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Actuarial gain from changes in financial assumptions ￦ (300,058 ) 186,428 Experience adjustments, etc. 41,835 (31,489 ) Expected return 10,435 12,308 ￦ (247,788 ) 167,247 Remeasurement component recognized as other comprehensive income or loss is recorded in retained earnings.

Provisions

Provisions	12 Months Ended
	Dec. 31, 2018
Provisions [Abstract]
Provisions	29. Provisions (1) Provisions as of December 31, 2017 and 2018 are as follows: 2017 2018 Current Non-current Current Non-current In millions of won Employment benefits Provisions for employment benefits ￦ 913,787 — 976,347 — Litigation Litigation provisions 48,621 24,955 40,157 37,636 Decommissioning cost Nuclear plants — 13,007,228 — 13,388,134 Spent fuel — 1,339,046 — 1,291,354 Radioactive waste 11,494 1,626,877 4,310 1,680,698 PCBs — 180,087 — 147,668 Other recovery provisions — 6,659 — 10,477 Others Power plant regional support program 153,756 — 137,668 — Transmission regional support program 243,365 — 151,698 — Provisions for tax 61 — 6,845 — Provisions for financial guarantee — 23,475 1,320 14,266 Provisions for RPS 271,624 — 93,919 — Provisions for greenhouse gas emissions obligations 414,252 — 136,187 — Others 80,538 16,387 46,347 15,515 ￦ 2,137,498 16,224,714 1,594,798 16,585,748 (2) Changes in provisions for the years ended December 31, 2017 and 2018 are as follows: 2017 Beginning Increase in Payment Reversal Others Ending balance In millions of won Employment benefits Provisions for employment benefits ￦ 810,607 984,896 (880,255 ) (1,461 ) — 913,787 Litigation Litigation provisions 198,237 34,629 (152,461 ) (7,096 ) 267 73,576 Decommissioning cost Nuclear plants 10,195,928 2,818,033 (6,733 ) — — 13,007,228 Spent fuel 1,374,225 307,682 (342,861 ) — — 1,339,046 Radioactive waste 1,479,502 222,632 (63,763 ) — — 1,638,371 PCBs 191,744 5,309 (14,266 ) (2,700 ) — 180,087 Other recovery provisions 507 5,939 — — 213 6,659 Others Power plant regional support program 152,851 94,039 (103,889 ) — 10,755 153,756 Transmission regional support program 282,608 143,178 (182,421 ) — — 243,365 Provisions for tax 242 — (25 ) (136 ) (20 ) 61 Provisions for financial guarantee 29,665 3,760 — (9,945 ) (5 ) 23,475 Provisions for RPS 417,404 242,946 (388,726 ) — — 271,624 Provisions for greenhouse gas emissions obligations 249,644 422,666 (256,758 ) (1,300 ) — 414,252 Others(*) 43,975 6,639 (3,348 ) (26,477 ) 76,136 96,925 ￦ 15,427,139 5,292,348 (2,395,506 ) (49,115 ) 87,346 18,362,212 (*) The Company believes that the possibility of economic outflow is probable on the cost of construction suspension of Shin-Kori unit 5 and 6 for three months. For this reason, the Company recognized ￦77,261 million of provision as addition to construction-in-progress. 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 53.(1), the Company believes that the possibility of economic 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 as addition to property, plant and equipment.

Government Grants

Government Grants	12 Months Ended
	Dec. 31, 2018
Government grants [Abstract]
Government Grants	30. Government Grants (1) Government grants as of December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Land ￦ (21,968 ) (21,968 ) Buildings (63,539 ) (63,189 ) Structures (196,414 ) (190,854 ) Machinery (183,188 ) (173,242 ) Vehicles (6,322 ) (4,220 ) Equipment (761 ) (418 ) Tools (1,027 ) (675 ) Construction-in-progress (49,084 ) (54,740 ) Finance lease assets (27 ) (26 ) Investment properties (83 ) (50 ) Software (486 ) (420 ) Development expenditures (3,702 ) (2,110 ) Intangible assets under development (10,540 ) (10,564 ) Usage rights of donated assets and other (11 ) — Other intangible assets other than goodwill — — ￦ (537,152 ) (522,476 ) (2) Changes in government grants for the years ended December 31, 2017 and 2018 are as follows: 2017 Beginning Receipt Acquisition Offset the Disposal Others Ending In millions of won Cash ￦ — (55,533 ) — — — 55,533 — Land (3,204 ) — — — 5 (18,769 ) (21,968 ) Buildings (61,188 ) — — 5,996 28 (8,375 ) (63,539 ) Structures (197,641 ) — — 10,011 1,905 (10,689 ) (196,414 ) Machinery (111,064 ) — — 17,390 489 (90,003 ) (183,188 ) Vehicles (107 ) — — 1,070 14 (7,299 ) (6,322 ) Equipment (732 ) — — 454 — (483 ) (761 ) Tools (430 ) — — 354 — (951 ) (1,027 ) Construction-in-progress (135,807 ) — 129,451 — — (42,728 ) (49,084 ) Finance lease assets — — — 1 — (28 ) (27 ) Investment properties (64 ) — — 2 — (21 ) (83 ) Software (595 ) — — 255 — (146 ) (486 ) Development expenditures (5,152 ) — — 2,811 — (1,361 ) (3,702 ) Intangible assets under development (11,090 ) — — — — 550 (10,540 ) Usage rights of donated assets and other (21 ) — — 10 — — (11 ) Others — — — — — — — ￦ (527,095 ) (55,533 ) 129,451 38,354 2,441 (124,770 ) (537,152 ) 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 — — — Others — — — — — — — ￦ (537,152 ) (30,416 ) 18,239 40,028 4,124 (17,299 ) (522,476 )

Deferred Revenues

Deferred Revenues	12 Months Ended
	Dec. 31, 2018
Deferred Revenues [Abstract]
Deferred Revenues	31. Deferred Revenues Deferred revenue related to the Company’s construction contracts for the years ended December 31, 2017 and 2018 are as follows which included in current and non-current non-financial 2017 2018 In millions of won Beginning balance ￦ 7,825,765 8,325,181 Increase during the current year 978,389 875,930 Recognized as revenue during the current year (478,973 ) (594,548 ) Ending balance ￦ 8,325,181 8,606,563

Non-financial Liabilities

Non-financial Liabilities	12 Months Ended
	Dec. 31, 2018
Other Liabilities Disclosure [Abstract]
Non-financial Liabilities	32. Non-financial Non-financial 2017 2018 Current Non-current Current Non-current In millions of won Advance received ￦ 3,772,713 181,612 3,724,238 80,937 Unearned revenue 41,593 19,718 63,038 4,690 Deferred revenue 476,631 7,848,550 556,072 8,050,491 Withholdings 164,370 10,529 172,454 10,856 Others 1,129,001 12,025 1,058,239 13,059 ￦ 5,584,308 8,072,434 5,574,041 8,160,033

Contributed Capital

Contributed Capital	12 Months Ended
	Dec. 31, 2018
Disclosure of classes of share capital [Abstract]
Contributed Capital	33. Contributed Capital (1) Details of shares issued as of December 31, 2017 and 2018 are as follows: 2017 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. 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. (2) Details in number of outstanding capital stock for the years ended December 31, 2017 and 2018 are as follows. 2017 2018 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, 2017 and 2018 are as follows: 2017 2018 In millions of won Share premium ￦ 843,758 843,758

Retained Earnings and Dividends

Retained Earnings and Dividends Paid	12 Months Ended
	Dec. 31, 2018
Disclosure of Retained Earnings and Dividends Paid [Abstract]
Retained Earnings and Dividends Paid	34. Retained Earnings and Dividends Paid (1) Details of retained earnings as of December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Legal reserve(*) ￦ 1,604,910 1,604,910 Voluntary reserves 34,833,844 35,906,267 Retained earnings before appropriations 16,931,804 14,007,942 Retained earnings ￦ 53,370,558 51,519,119 (*) 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, 2017 and 2018 are as follows: 2017 2018 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 29,016,395 30,088,818 Reserve for equalizing dividends 210,000 210,000 ￦ 34,833,844 35,906,267 (*) 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, 2017 and 2018 are as follows: 2017 2018 In millions of won Beginning balance ￦ 53,173,871 53,370,558 Effect of change in accounting policy — 71,928 Net profit (loss) for the period attributed to owner of the Company 1,298,720 (1,314,567 ) Changes in equity method retained earnings 10,065 (1,153 ) Remeasurements of defined benefit liability, net of tax 158,991 (100,495 ) Dividends paid (1,271,089 ) (507,152 ) Ending balance ￦ 53,370,558 51,519,119 (4) Dividends paid for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 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 ￦ 3,100 1,990,089 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 (5) Changes in retained earnings of investments in associates and joint ventures for the years ended December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Beginning balance ￦ (4,943 ) 5,122 Changes 10,065 (1,153 ) Ending balance ￦ 5,122 3,969 (6) Changes in remeasurement components for the years ended December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Beginning balance ￦ (222,997 ) (43,513 ) Changes 239,636 (154,198 ) Income tax effect (80,645 ) 53,703 Transfer to reserve for business expansion 20,493 (75,373 ) Ending balance ￦ (43,513 ) (219,381 )

Statement of Appropriation of R

Statement of Appropriation of Retained Earnings	12 Months Ended
	Dec. 31, 2018
Statement of Appropriation of Retained Earnings [Abstract]
Statement of Appropriation of Retained Earnings	35. Statement of Disposition of Deficit For the year ended December 31, 2017, KEPCO’s retained earnings were appropriated on March 30, 2018. For the year ended December 31, 2018, KEPCO’s deficits are expected to be appropriated on March 22, 2019. Statements of disposition of deficit and appropriation of retained earnings of KEPCO, the controlling company, for the years ended December 31, 2017 and 2018, respectively, are as follows: 2017 2018 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) 1,506,852 (1,095,213 ) Remeasurements of the defined benefit plan 72,723 (65,442 ) 1,579,575 (1,120,842 ) II. Transfer from voluntary reserves — 1,120,842 III.  Subtotal (I+II) 1,579,575 — IV.  Appropriations of retained earnings (1,579,575 ) — Legal reserve — — Dividends (government, individual) Amount of dividends per share (%) : Current year—￦0 Prior year—￦790 (16%) (507,152 ) — Reserve for business expansion (1,072,423 ) — V. Unappropriated retained earnings to be carried over forward to subsequent year — —

Hybrid Bonds

Hybrid Bonds	12 Months Ended
	Dec. 31, 2018
Hybrid Bonds [Abstract]
Hybrid Bonds	36. Hybrid Bonds Hybrid bonds classified as equity (non-controlling Issuer Hybrid bond Issued date Maturity Yield (%) 2017 2018 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, 2018
Other Components of Equity [Abstract]
Other Components of Equity	37. Other Components of Equity (1) Other components of equity of the parent as of December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Other capital surplus ￦ 1,233,793 1,234,825 Accumulated other comprehensive loss (271,457 ) (358,570 ) Other equity 13,294,973 13,294,973 ￦ 14,257,309 14,171,228 (2) Changes in other capital surplus for the years ended December 31, 2017 and 2018 are as follows: 2017 2018 Gains on treasury stocks Others Subtotal Gains on disposal of treasury stocks Others Subtotal In millions of won Beginning balance ￦ 387,524 847,622 1,235,146 387,524 846,269 1,233,793 Issuance of share capital of subsidiary — (1,378 ) (1,378 ) — 1,032 1,032 Others — 25 25 — — — Ending balance ￦ 387,524 846,269 1,233,793 387,524 847,301 1,234,825 (3) Changes in accumulated other comprehensive income (loss) for the years ended December 31, 2017 and 2018 are as follows: 2017 Available-for-sale financial asset valuation reserve Shares in other Income (loss) of investments in associates and Reserve for overseas translation credit Reserve for gain (loss) on derivatives Total In millions of won Beginning balance ￦ 36,370 221,455 (223,056 ) (68,644 ) (33,875 ) Changes in the unrealized fair value of available-for-sale (7,102 ) — — — (7,102 ) Shares in other comprehensive loss of associates and joint ventures, net of tax — (154,991 ) — — (154,991 ) Foreign currency translation of foreign operations, net of tax — — (95,103 ) — (95,103 ) Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax — — — 19,614 19,614 Ending balance ￦ 29,268 66,464 (318,159 ) (49,030 ) (271,457 ) 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 ) (4) Details of changes in other equity for the years ended December 31, 2017 and 2018 are as follows: 2017 2018 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, 2018
Revenue [Abstract]
Sales	38. Sales Details of sales for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 2017 2018 Domestic Overseas Domestic Overseas Domestic Overseas In millions of won [Type of goods and services] Sales of goods ￦ 54,982,095 397,392 55,373,316 399,232 57,514,866 382,938 Electricity 54,304,529 — 54,649,882 — 56,842,011 — Heat supply 181,597 — 205,838 — 216,117 — Others 495,969 397,392 517,596 399,232 456,738 382,938 Sales of service 195,697 161,046 186,990 164,167 176,539 216,328 Sales of construction services 132,219 3,894,638 92,501 3,119,683 108,586 1,633,805 ￦ 55,310,011 4,453,076 55,652,807 3,683,082 57,799,991 2,233,071 [Timing of revenue recognition] Performance obligations satisfied at a point in time ￦ 54,982,095 397,392 55,373,316 399,232 57,514,866 382,938 Performance obligations satisfied over time 327,916 4,055,684 279,491 3,283,850 285,125 1,850,133 ￦ 55,310,011 4,453,076 55,652,807 3,683,082 57,799,991 2,233,071

Selling and Administrative Expe

Selling and Administrative Expenses	12 Months Ended
	Dec. 31, 2018
Selling, general and administrative expense [Abstract]
Selling and Administrative Expenses	39. Selling and Administrative Expenses (1) Selling and administrative expenses for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 2017 2018 In millions of won Salaries ￦ 734,930 735,383 757,819 Retirement benefit expense 72,812 71,094 65,107 Welfare and benefit expense 162,243 179,406 132,089 Insurance expense 11,513 15,414 12,181 Depreciation 169,431 190,245 214,499 Amortization of intangible assets 35,171 44,990 54,153 Bad debt expense 38,719 126,714 39,784 Commission 605,879 673,740 714,096 Advertising expense 34,658 114,519 30,894 Training expense 6,314 7,027 6,277 Vehicle maintenance expense 10,390 9,998 10,148 Publishing expense 3,643 3,672 3,307 Business promotion expense 3,477 3,700 2,785 Rent expense 40,020 38,380 42,851 Telecommunication expense 25,448 24,916 23,505 Transportation expense 596 495 686 Taxes and dues 46,531 48,395 46,424 Expendable supplies expense 6,834 7,731 6,166 Water, light and heating expense 9,720 10,545 12,629 Repairs and maintenance expense 75,122 63,477 62,580 Ordinary development expense 188,063 211,417 215,494 Travel expense 16,115 16,658 14,363 Clothing expense 8,273 8,410 10,108 Survey and analysis expense 666 698 705 Membership fee 1,132 1,122 1,043 Others 331,532 154,709 148,197 ￦ 2,639,232 2,762,855 2,627,890 (2) Other selling and administrative expenses for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 2017 2018 In millions of won Accommodation development expenses ￦ 186,896 55,799 52,822 Miscellaneous wages 31,907 32,300 32,447 Litigation and filing expenses 12,328 11,881 12,853 Compensation for damages 60,341 12,297 19,193 Outsourcing expenses 3,530 2,647 3,036 Reward expenses 3,267 2,786 2,713 Overseas market development expenses 2,177 1,876 1,361 Others 31,086 35,123 23,772 ￦ 331,532 154,709 148,197

Other Income and Expense

Other Income and Expense	12 Months Ended
	Dec. 31, 2018
Disclosure of other operating income (expense) [Abstract]
Other Income and Expense	40. Other Income and Expense (1) Other income for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 2017 2018 In millions of won Reversal of other provisions ￦ 22,034 35,265 12,700 Reversal of other allowance for doubtful accounts 5,489 2,166 143 Gains on government grants 111 430 482 Gains on assets contributed 12,254 4,218 17,336 Gains on liabilities exempted 1,959 3,166 10,303 Compensation and reparations revenue 114,530 89,196 89,901 Revenue from research contracts 13,143 12,580 6,818 Income related to transfer of assets from customers 427,297 478,973 594,548 Rental income 211,580 192,136 186,631 Others 31,787 50,988 51,032 ￦ 840,184 869,118 969,894 (2) Details of others of other income for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 2017 2018 In millions of won Refund of claim for rectification ￦ 8,722 9,655 8,933 Adjustment of research project 4,148 3,884 2,267 Maintenance expenses on lease building 354 135 176 Training expenses 4,478 3,045 3,220 Deposit redemption 991 34 7 Reversal of expenses on litigation 893 360 753 Revenue on royalty fee 2,486 2,888 6,909 Reimbursement of insurance fee — 1,498 7,145 Gains on guarantee contracts 2,796 456 39 Others 6,919 29,033 21,583 ￦ 31,787 50,988 51,032 (3) Other expense for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 2017 2018 In millions of won Compensation and indemnification expense ￦ — 37 23,437 Accretion expenses of other provisions 4,556 7,535 41,924 Depreciation expenses on investment properties 678 1,176 923 Depreciation expenses on idle assets 6,639 6,644 6,547 Other bad debt expense 4,585 1,778 17,827 Donations 114,094 119,421 63,743 Others 58,072 43,464 76,929 ￦ 188,624 180,055 231,330 (4) Details of others of other expense for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 2017 2018 In millions of won Operating expenses related to the idle assets ￦ 459 136 47 Research grants 1,461 1,180 461 Supporting expenses on farming and fishing village 15,201 11,956 13,537 Operating expenses on fitness center 2,706 3,498 4,788 Expenses on adjustment of research and development grants — 806 404 Taxes and dues 4,582 2,270 199 Expenses on R&D supporting 690 5,459 53 Others(*) 32,973 18,159 57,440 ￦ 58,072 43,464 76,929 (*) Others include ￦38,886 million of impairment loss on construction-in-progress

Other Gains (Losses)

Other Gains (Losses)	12 Months Ended
	Dec. 31, 2018
Other Gains (Losses) [Abstract]
Other Gains (Losses)	41. Other Gains (Losses) (1) Composition of other gains (losses) for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 2017 2018 In millions of won Other gains Gains on disposal of property, plant, and equipment ￦ 74,035 48,316 98,077 Gains on disposal of intangible assets — 564 12 Reversal of impairment loss on intangible assets 3 54 17 Gains on foreign currency translation 15,311 20,485 14,905 Gains on foreign currency transaction 55,377 93,151 47,297 Gains on insurance proceeds — 400 — Others 187,792 269,562 221,556 Other losses Losses on disposal of property, plant and equipment (42,715 ) (70,514 ) (60,704 ) Losses on disposal of intangible assets (158 ) (183 ) (43 ) Impairment loss on property, plant and equipment — (51,067 ) (710,162 ) Impairment loss on intangible assets (3,945 ) (20 ) (8,112 ) Impairment loss on other non-current — — (87,024 ) Losses on foreign currency translation (23,835 ) (25,495 ) (7,678 ) Losses on foreign currency transaction (72,058 ) (36,241 ) (65,366 ) Others (119,309 ) (92,385 ) (63,899 ) ￦ 70,498 156,627 (621,124 ) (2) Details of others of other gains for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 2017 2018 In millions of won Gains on disposal of inventories ￦ 9,494 6,024 6,350 Gains on valuation of inventories 2 — — Gains on proxy collection of TV license fee 38,991 39,711 40,450 Gains on compensation of impaired electric poles 3,650 1,526 1,166 Gains on compensation for infringement on contract 3,040 18,990 3,648 Gains on harbor facilities dues 2,957 3,025 3,803 Gains on technical fees 1,271 2,105 2,026 Reversal of occupation development training fees 1,756 1,697 1,602 Gains on disposal of waste 4,222 4,261 4,232 Gains on insurance 3,786 10,410 22,382 Gains on tax rebate 5,226 2,161 542 Gains on other commission 4,639 4,790 4,347 Gains on research tasks 10 — — Gains on settlement and others 2,188 — — Gains on sales of greenhouse gas emissions rights 46 — — Others 106,514 174,862 131,008 ￦ 187,792 269,562 221,556 (3) Details of others of other losses for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 2017 2018 In millions of won Losses on valuation of inventories ￦ 2,683 3,875 1,953 Losses on disposal of inventories 3,092 3,273 3,555 Losses due to disaster 1,522 5,374 2,129 Losses on rounding adjustment of electric charge surtax 1,260 1,253 1,265 Losses on adjustments of levies 1,184 1 — Forfeit of taxes and dues 4,582 656 — Losses on litigation 2,581 — — Others 102,405 77,953 54,997 ￦ 119,309 92,385 63,899

Finance Income

Finance Income	12 Months Ended
	Dec. 31, 2018
Finance income [Abstract]
Finance Income	42. Finance Income (1) Finance income for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 2017 2018 In millions of won Interest income ￦ 241,778 206,143 223,767 Dividends income 9,446 11,477 12,777 Gains on disposal of financial assets 1,482 1,130 1,838 Gains on valuation of Financial assets at fair value through profit or loss — 12 8,495 Gains on valuation of derivatives 293,830 16,165 199,943 Gains on transaction of derivatives 45,549 29,257 179,745 Gains on foreign currency translation 161,905 1,115,832 143,254 Gains on foreign currency transaction 37,553 150,602 27,051 ￦ 791,543 1,530,618 796,870 (2) Interest income included in finance income for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 2017 2018 In millions of won Cash and cash equivalents ￦ 61,380 35,474 40,704 Financial assets at fair value through profit or loss — 290 21,713 Financial assets at amortized cost — — 89 Held-to-maturity 97 82 — Loans 25,106 30,014 21,925 Short-term financial instrument 45,763 29,412 41,025 Long-term financial instrument 7,195 8,144 7,920 Other financial assets — — 1 Trade and other receivables 102,237 102,727 90,390 ￦ 241,778 206,143 223,767

Finance Expenses

Finance Expenses	12 Months Ended
	Dec. 31, 2018
Finance Expenses [Abstract]
Finance Expenses	43. Finance Expenses (1) Finance expenses for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 2017 2018 In millions of won Interest expense ￦ 1,752,868 1,789,552 1,868,458 Losses on sale of financial assets 9 2,343 1 Losses on valuation of financial assets at fair value through profit or loss — — 6,616 Impairment of available-for-sale 86,703 2,713 — Losses on valuation of derivatives 5,762 890,832 46,740 Losses on transaction of derivatives 101,987 198,218 32,448 Losses on foreign currency translation 406,849 207,944 393,859 Losses on foreign currency transaction 57,889 35,175 121,763 Losses on repayment of financial liabilities 23,000 5 — Other 2,020 1,170 858 ￦ 2,437,087 3,127,952 2,470,743 (2) Interest expense included in finance expenses for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 2017 2018 In millions of won Trade and other payables ￦ 68,375 57,160 42,830 Short-term borrowings 6,969 35,891 32,545 Long-term borrowings 91,584 87,011 92,243 Debt securities 1,922,900 1,698,232 1,771,544 Other financial liabilities 482,428 491,665 505,112 2,572,256 2,369,959 2,444,274 Less: Capitalized borrowing costs (819,388 ) (580,407 ) (575,816 ) ￦ 1,752,868 1,789,552 1,868,458 Capitalization rates for the years ended December 31, 2016, 2017 and 2018 are 2.29%~4.16%, 2.30%~3.60% and 2.17%~3.86%, respectively.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2018
Income tax expense (benefit) [Abstract]
Income Taxes	44. Income Taxes (1) Income tax expense (benefit) for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 2017 2018 In millions of won Current income tax expense Payment of income tax ￦ 2,689,640 881,583 378,715 Adjustment in respect of prior years due to change in estimate 231,113 4,484 (195,648 ) Current income tax directly recognized in equity 30,059 (56,098 ) 101,528 Effect of change in accounting policy — — 1,780 2,950,812 829,969 286,375 Deferred income tax expense Generation and realization of temporary differences 509,762 1,283,012 (495,658 ) Changes of unrecognized tax losses, tax credit and temporary differences for prior periods (86,845 ) 44,573 (28,509 ) Changes in deferred tax on tax losses carryforwards — — (572,305 ) Tax credit carryforwards (8,588 ) 15,270 (16,224 ) 414,329 1,342,855 (1,112,696 ) Income tax expense (benefit) ￦ 3,365,141 2,172,824 (826,321 ) (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, 2016, 2017 and 2018 are as follows: 2016 2017 2018 In millions of won Income (loss) before income tax ￦ 10,513,468 3,614,218 (2,000,819 ) Income tax expense (benefit) computed at applicable tax rate(*1) 2,544,259 874,641 (550,225 ) Adjustments Effect of applying gradual tax rate (5,082 ) (5,082 ) (1,408 ) Effect of non-taxable (29,554 ) (32,032 ) (1,705 ) Effect of non-deductible 22,258 15,032 40,151 Effect of tax losses that are not recognized as deferred tax asset — — 2,086 Effects of tax credits and deduction (194,731 ) (161,069 ) (39,471 ) Recognition (reversal) of unrecognized deferred tax asset, net (86,845 ) 44,573 (28,509 ) Effect of change in deferred tax due to change in tax rate — 1,055,154 261 Deferred income tax related to investments in subsidiaries and associates 862,956 394,145 (52,618 ) Others, net 20,767 (17,022 ) 765 589,769 1,293,699 (80,448 ) Adjustment in respect of prior years due to change in estimate 231,113 4,484 (195,648 ) Income tax expense (benefit) ￦ 3,365,141 2,172,824 (826,321 ) Effective tax rate 32 % 60 % (*2 ) (*1) Applicable tax rate is 24.2% as of December 31, 2016 and 2017, and 27.5% as of December 31, 2018. (*2) The effective tax rate for the year ended December 31, 2018 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, 2016, 2017 and 2018 are as follows: 2016 2017 2018 In millions of won Dividends of hybrid bond ￦ 5,253 5,248 4,273 Gain on disposal of investments in subsidiaries (7,006 ) — — Effect of change in effective tax rate — (25 ) — ￦ (1,753 ) 5,223 4,273 (4) Income tax recognized as other comprehensive income (loss) for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 2017 2018 In millions of won Income tax recognized as other comprehensive income (loss) Gain on valuation of financial assets at fair value through other comprehensive income ￦ — — 35,798 Loss on valuation of available-for-sale (8,143 ) (2,551 ) — Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax (18,335 ) (11,016 ) 6,639 Remeasurement of defined benefit obligations 49,986 (80,645 ) 53,703 Investments in associates 7,731 8,649 6,592 Others 573 24,242 (5,477 ) ￦ 31,812 (61,321 ) 97,255 (5) Changes in deferred income tax assets (liabilities) recognized in the statements of financial position for the years ended December 31, 2017 and 2018 are as follows: 2017 Beginning balance Amounts Amount Amounts recognized directly in equity Ending balance In millions of won Deferred income tax on temporary differences Employee benefits ￦ 493,331 86,008 (80,645 ) — 498,694 Cash flow hedge (53,583 ) 130,044 (11,016 ) — 65,445 Investments in associates or subsidiaries (7,166,345 ) (1,510,295 ) 8,649 (25 ) (8,668,016 ) Property, plant and equipment (5,527,318 ) (1,333,122 ) — — (6,860,440 ) Finance lease (345,431 ) (81,518 ) — — (426,949 ) Intangible assets 8,987 (1,339 ) — — 7,648 Financial assets at fair value through profit or loss (62 ) 952 — — 890 Available-for-sale (68,347 ) 62,055 (2,551 ) — (8,843 ) Deferred revenue 213,859 16,852 — — 230,711 Provisions 3,583,371 1,239,462 — — 4,822,833 Doubtful receivables 2,696 (2,637 ) — — 59 Other finance liabilities 30,249 (2,742 ) — 5,248 32,755 Gains or losses on foreign exchange translation 138,938 (140,292 ) — — (1,354 ) Allowance for doubtful accounts 17,252 25,679 — — 42,931 Accrued income (5,367 ) 3,542 — — (1,825 ) Special deduction for property, plant and equipment (194,309 ) (6,618 ) — — (200,927 ) Reserve for research and human development (12,883 ) 9,842 — — (3,041 ) Others 695,870 232,642 24,242 — 952,754 (8,189,092 ) (1,271,485 ) (61,321 ) 5,223 (9,516,675 ) Deferred income tax on unused tax losses and tax credit Tax losses — — — — — Tax credit 35,703 (15,272 ) — — 20,431 35,703 (15,272 ) — — 20,431 ￦ (8,153,389 ) (1,286,757 ) (61,321 ) 5,223 (9,496,244 ) 2018 Beginning balance Amounts Amount Amounts recognized directly in equity Ending balance In millions of won Deferred income 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 income 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 ) (6) Deferred income tax assets (liabilities) recognized in the statements of financial position as of December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Deferred income tax assets ￦ 919,153 1,233,761 Deferred income tax liabilities (10,415,397 ) (9,617,309 ) ￦ (9,496,244 ) (8,383,548 ) (7) Details of deductible temporary differences, tax losses and unused tax credits for which no deferred income tax assets were recognized as of December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Deductible temporary differences ￦ 444,426 442,391

Assets Held-for-Sale

Assets Held-for-Sale	12 Months Ended
	Dec. 31, 2018
Assets Held-for-Sale [Abstract]
Assets Held-for-Sale	45. Assets Held-for-Sale Assets held-for-sale 2017 2018 In millions of won Land(*1) ￦ 2,765 2,765 Building(*1) 19,369 19,369 Investments in associates(*2, 3, 4) 5,837 — Investments in subsidiaries(*5) — 747 ￦ 27,971 22,881 (*1) The board of directors of KEPCO Engineering & Construction Company, Inc., a subsidiary of the Company, determined to dispose the office building in Yongin as part of the government’s plan to relocate state-run held-for-sale. (*2) Korea Western Power Co., Ltd., a subsidiary of the Company, planned to dispose certain portion of its investment in Dongducheon Dream Power Co., Ltd. and had classified the relevant book value as non-current held-for-sale. (*3) Korea Hydro & Nuclear Power Co., Ltd., a subsidiary of the Company, initiated efforts to sell its shares in Yeongwol Energy Station Co., Ltd. during the year ended December 31, 2016, and sold its shares in Yeongwol Energy Station Co. during the year ended December 31, 2018. (*4) KEPCO Engineering & Construction Company, Inc., a subsidiary of the Company, exercised a put option to sell the shares of DS POWER Co., Ltd. on December 11, 2017 and the shares were sold on February 28, 2018. (*5) KOWEPO India Private Limited was in the process of liquidating its business as of December 31, 2018 and has been reclassified to assets held-for-sale,

Expenses Classified by Nature

Expenses Classified by Nature	12 Months Ended
	Dec. 31, 2018
Expenses Classified by Nature [Abstract]
Expenses Classified by Nature	46. Expenses Classified by Nature Expenses classified by nature for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 Selling and Cost of sales Total In millions of won Raw materials used ￦ — 13,470,586 13,470,586 Salaries 734,930 3,425,712 4,160,642 Retirement benefit expense 72,812 374,826 447,638 Welfare and benefit expense 162,243 507,691 669,934 Insurance expense 11,513 79,987 91,500 Depreciation 169,431 8,704,525 8,873,956 Amortization of intangible assets 35,171 44,544 79,715 Bad debt expense 38,719 — 38,719 Commission 605,879 423,179 1,029,058 Advertising expense 34,658 9,693 44,351 Training expense 6,314 13,347 19,661 Vehicle maintenance expense 10,390 7,016 17,406 Publishing expense 3,643 4,615 8,258 Business promotion expense 3,477 4,836 8,313 Rent expense 40,020 133,670 173,690 Telecommunication expense 25,448 75,925 101,373 Transportation expense 596 5,153 5,749 Taxes and dues 46,531 464,962 511,493 Expendable supplies expense 6,834 34,668 41,502 Water, light and heating expense 9,720 25,820 35,540 Repairs and maintenance expense 75,122 1,896,656 1,971,778 Ordinary development expense 188,063 517,441 705,504 Travel expense 16,115 63,611 79,726 Clothing expense 8,273 5,363 13,636 Survey and analysis expense 666 3,209 3,875 Membership fee 1,132 8,714 9,846 Power purchase — 10,755,739 10,755,739 Others 331,532 4,488,065 4,819,597 ￦ 2,639,232 45,549,553 48,188,785 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

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2018
Earnings per share [Abstract]
Earnings per share	47. Earnings (Loss) Per Share (1) Basic earnings (loss) per share for the years ended December 31, 2016, 2017 and 2018 are as follows: Type 2016 2017 2018 In won Basic earnings (loss) per share ￦ 10,980 2,023 (2,048 ) (2) Diluted earnings (loss) per share for the years ended December 31, 2016, 2017 and 2018 are as follows: Type 2016 2017 2018 In won Diluted earnings (loss) per share ￦ 10,980 2,023 (2,048 ) (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, 2016, 2017 and 2018 are as follows: Type 2016 2017 2018 In millions of won except number of shares Net profit (loss) attributable to controlling interest ￦ 7,048,581 1,298,720 (1,314,567 ) Profit (loss) used in the calculation of total basic earnings (loss) per share 7,048,581 1,298,720 (1,314,567 ) 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, 2016, 2017 and 2018 are as follows: Type 2016 2017 2018 In millions of won Profit (loss) used in the calculation of total diluted earnings (loss) per share ￦ 7,048,581 1,298,720 (1,314,567 ) 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, 2016, 2017 and 2018 are as follows: Type 2016 2017 2018 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 and diluted earnings (loss) per share are same as basic earnings (loss) per share for the years ended December 31, 2016, 2017 and 2018.

Risk Management

Risk Management	12 Months Ended
	Dec. 31, 2018
Risk Management [Abstract]
Risk Management	48. 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, 2017 and 2018 are as follows: 2017 2018 In millions of won Total borrowings and debt securities ￦ 54,747,392 61,034,627 Cash and cash equivalents 2,369,739 1,358,345 Net borrowings and debt securities 52,377,653 59,676,282 Total shareholder’s equity 72,964,641 71,092,762 Debt to equity ratio 71.78 % 83.94 % (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, 2017 and 2018 are as follows: 2017 2018 In millions of won Cash and cash equivalents ￦ 2,369,739 1,358,345 Financial assets at fair value through profit or loss — 920,935 Financial assets at fair value through profit or loss 111,512 — Derivative assets (trading) 22,020 37,631 Equity investment at fair value through other comprehensive income — 399,495 Available-for-sale 699,833 — Financial assets at amortized cost — 14,042 Held-to-maturity 3,144 — Loans 905,641 718,674 Long-term/short-term financial instruments 2,244,514 2,318,027 Derivative assets (applying hedge accounting) 10,606 64,704 Trade and other receivables 9,683,769 9,613,437 Financial guarantee contracts(*) 1,154,862 1,310,817 (*) 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, 2017 and 2018 are as follows: 2017 2018 Type Accounts 1% Increase 1% Decrease 1% Increase 1% Decrease In millions of won Future salary increases Increase (decrease) in defined benefit obligation ￦ 354,852 (305,494 ) 416,956 (363,820 ) Discount rate Increase (decrease) in defined benefit obligation (313,597 ) 377,148 (377,221 ) 445,833 Changes of employee benefits assuming a 1% increase and decrease movements in discount rate on plan asset for the years ended December 31, 2017 and 2018 are ￦8,926 million and ￦14,646 million, respectively. ② Provisions Changes in provisions due to movements in underlying assumptions as of December 31, 2017 and 2018 are as follows: Type Accounts 2017 2018 PCBs Inflation rate 1.23 % 1.27 % Discount rate 2.55 % 2.18 % Nuclear plants Inflation rate 1.21 % 1.21 % Discount rate 2.94 % 2.94 % 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, 2017 and 2018 are as follows: 2017 2018 Type Accounts 0.1% Increase 0.1% Decrease 0.1% Increase 0.1% Decrease In millions of won Discount rate PCBs ￦ (811 ) 816 (623 ) 627 Nuclear plants (262,949 ) 270,370 (256,513 ) 263,595 Spent fuel (51,015 ) 52,997 (49,182 ) 51,098 Inflation rate PCBs 826 (822 ) 632 (629 ) Nuclear plants 287,926 (280,249 ) 294,984 (287,110 ) Spent fuel 53,763 (51,823 ) 51,837 (49,961 ) 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, 2017 and 2018 are as follows: Assets Liabilities Type 2017 2018 2017 2018 In thousands of foreign currencies AED 5,693 10,513 2,049 5,890 AUD 145 143 652,259 717,712 BDT 60,208 71,575 1,001 1,175 BWP 797 1,214 — — CAD 82 96 171 4 CHF — — 400,004 400,000 CNY 13,007 — 26,140 26,140 EUR 5,708 337 68,003 105,673 GBP 3 — 2,327 1 HKD — — — 1,650,000 IDR 167,775 60,568 — 206,935 INR 1,228,259 1,228,795 227,078 183,963 JOD 1,624 2,764 5 5 JPY 799,501 35,935 21,624,128 390,921 KZT 359 319 — — MGA 2,762,572 3,318,447 319,581 170,641 NOK — — 482 — PHP 189,261 709,285 125,431 66,985 PKR 251,190 305,542 4,676 3,588 SAR 1,191 2,024 44 — SEK — — 449,002 450,000 USD 1,653,858 1,422,510 8,321,335 8,103,602 UYU 12,955 39,898 10,586 4,253 ZAR 361 170 4 4 MMK — 25,208 — — GHS — 25,794 — — 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, 2017 and 2018 are as follows: 2017 2018 Type 10% Increase 10% Decrease 10% Increase 10% Decrease In millions of won Increase (decrease) of profit before ￦ (844,122 ) 844,122 (887,561 ) 887,561 Increase (decrease) of shareholder’s (844,122 ) 844,122 (887,561 ) 887,561 (*) 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, 2017 and 2018. 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, 2017 and 2018 are as follows: Type 2017 2018 In millions of won Short-term borrowings ￦ 290,873 24,235 Long-term borrowings 1,743,252 2,358,860 Debt securities 685,700 — ￦ 2,719,825 2,383,095 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, 2017 and 2018 are as follows: 2017 2018 Type 1% Increase 1% Decrease 1% Increase 1% Decrease In millions of won Increase (decrease) of profit before income tax ￦ (27,198 ) 27,198 (23,831 ) 23,831 Increase (decrease) of shareholder’s equity(*) (27,198 ) 27,198 (23,831 ) 23,831 (*) 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, 2017 and 2018 are as follows: 2017 2018 Type 1% Increase 1% Decrease 1% Increase 1% Decrease In millions of won Increase (decrease) of profit before income tax ￦ 546,499 (546,499 ) 568,420 (568,420 ) Increase (decrease) of shareholder’s equity(*) 546,499 (546,499 ) 568,420 (568,420 ) (*) 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 2017 Type Less than 1 year 1~2 Years 2~5 Years More than 5 years Total In millions of won Borrowings and debt securities ￦ 10,748,437 7,948,320 21,331,394 22,694,867 62,723,018 Finance lease liabilities 174,534 87,709 185,284 108,749 556,276 Trade and other payables 5,867,729 301,165 698,289 1,937,558 8,804,741 Financial guarantee contracts(*) 7,081 18,054 1,049,667 80,060 1,154,862 ￦ 16,797,781 8,355,248 23,264,634 24,821,234 73,238,897 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 (*) This represents the total guarantee amounts associated with the financial guarantee contracts. Financial guarantee liabilities which are recognized as of December 31, 2017 and 2018 are ￦23,475 million and ￦15,586 million, respectively. The expected maturities for non-derivative 2017 Type Less than 1 year 1~5 Years More than 5 years Other(*) Total In millions of won Cash and cash equivalents ￦ 2,369,739 — — — 2,369,739 Available-for-sale — — 214,156 485,677 699,833 Held-to-maturity 5 3,139 — — 3,144 Loans 244,309 261,672 429,628 10,821 946,430 Long-term/short-term financial instruments 1,702,084 201,821 340,304 305 2,244,514 Financial assets at fair value through profit or loss — — 111,512 — 111,512 Trade and other receivables 7,930,715 920,539 788,795 52,031 9,692,080 ￦ 12,246,852 1,387,171 1,884,395 548,834 16,067,252 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 Equity investment 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 (*) The maturities cannot be presently determined. Derivative liabilities classified by maturity periods which from reporting date to maturity date of contract as of December 31, 2017 and 2018 are as follows: 2017 Type Less than 1 year 1~2 Years 2~5 Years More than 5 years Total In millions of won Net settlement —Trading ￦ (774 ) — — — (774 ) Gross settlement —Trading (51,496 ) (19,887 ) (16,597 ) (4,967 ) (92,947 ) —Hedging (17,547 ) (28,977 ) (192,205 ) (44,137 ) (282,866 ) ￦ (69,817 ) (48,864 ) (208,802 ) (49,104 ) (376,587 ) 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 (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 is estimated by discounting a 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, 2017 and 2018 are as follows: 2017 2018 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 Available-for-sale 699,833 699,833 — — Derivative assets (trading) 22,020 22,020 37,631 37,631 Derivative assets (applying hedge accounting) 10,606 10,606 64,704 64,704 Long-term financial instruments 542,430 542,430 — — Short-term financial instruments 1,702,084 1,702,084 — — Financial assets at fair value through profit or loss — — 920,935 920,935 Financial assets at fair value through profit or loss 111,512 111,512 — — ￦ 3,088,485 3,088,485 1,422,765 1,422,765 Assets carried at amortized cost Financial assets at amortized cost ￦ — — 14,042 14,042 Held-to-maturity 3,144 3,144 — — Loans and receivables 905,641 905,641 718,674 718,674 Long-term financial instruments — — 448,741 448,741 Short-term financial instruments — — 1,869,286 1,869,286 Trade and other receivables 9,683,769 9,683,769 9,613,437 9,613,437 Cash and cash equivalents 2,369,739 2,369,739 1,358,345 1,358,345 ￦ 12,962,293 12,962,293 14,022,525 14,022,525 Liabilities recognized at fair value Derivative liabilities (trading) ￦ 150,929 150,929 99,010 99,010 Derivative liabilities (applying hedge accounting) 277,130 277,130 213,153 213,153 ￦ 428,059 428,059 312,163 312,163 Liabilities carried at amortized cost Secured borrowings ￦ 1,055,554 1,055,554 741,029 741,029 Unsecured bond 51,146,783 53,436,659 56,603,988 58,804,070 Finance lease liabilities 418,260 418,260 283,806 283,806 Unsecured borrowings 2,476,196 2,477,055 3,522,602 3,950,517 Trade and other payables(*2) 8,804,741 8,804,741 9,063,285 9,063,285 Bank overdraft 68,859 68,859 167,008 167,008 ￦ 63,970,393 66,261,128 70,381,718 73,009,715 (*1) Book value of equity securities held by the Company that were measured at cost as of December 31, 2017 is ￦37,926 million as a quoted market price does not exist in an active market and its fair value cannot be measured reliably. (*2) Excludes finance lease liabilities. (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, 2017 and 2018 are as follows: Type 2017 2018 Derivatives 0.03% ~ 4.16% 0.02% ~ 4.16% Borrowings and debt securities 0.08% ~ 4.38% 0.51% ~ 5.14% Finance lease 9.00% ~ 10.83% 3.50% ~ 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, 2017 and 2018 are as follows: 2017 Type Level 1 Level 2 Level 3 Total In millions of won Financial assets at fair value Available-for-sale ￦ 274,453 214,156 173,298 661,907 Derivative assets — 18,466 14,160 32,626 Financial assets at fair value through profit or loss — 111,512 — 111,512 ￦ 274,453 344,134 187,458 806,045 Financial liabilities at fair value Derivative liabilities ￦ — 428,059 — 428,059 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 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, 2017 and 2018 are as follows: 2017 Beginning Acquisition Reclassified Valuation Disposal Foreign Ending In millions of won Financial assets at fair value Available-for-sale Unlisted securities ￦ 269,461 — (92,128 ) (6,201 ) — 2,166 173,298 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 value through other comprehensive income Unlisted securities — 197,450 — — (11,744 ) (326 ) 4,059 189,439

Service Concession Arrangements

Service Concession Arrangements	12 Months Ended
	Dec. 31, 2018
Service Concession Arrangements [Abstract]
Service Concession Arrangements	49. 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, 2018 are as follows: Type Amounts In millions of won Less than 1 year ￦ 116,790 1~ 2 years 116,790 2~ 3 years 116,790 Over 3 years 48,663 ￦ 399,033 (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, 2018 are as follows: Type Amounts In millions of won Less than 1 year ￦ 27,803 1~ 2 years 27,929 2~ 3 years 27,863 Over 3 years 595,706 ￦ 679,301 (iv) Accumulated contract costs and profits related to the Company’s contract in process as of December 31, 2018 are ￦163,309 million and ￦9,673 million, respectively. There are no amount due from customers and advance receipts in progress.

Related Parties

Related Parties	12 Months Ended
	Dec. 31, 2018
Related Parties [Abstract]
Related Parties	50. Related Parties (1) Related parties of the Company as of December 31, 2018 are as follows: Type Related party Parent Republic of Korea government Subsidiaries (106 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., Garolim Tidal Power Plant 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, Korea Electric Power Nigeria Ltd., 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, 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 Singapore Holdings Pte., Ltd., 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., HI 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 (58 associates) Dongducheon Dream Power Co., Ltd., Korea Gas Corporation, SE Green Energy Co., Ltd., Daegu Photovoltaic Co., Ltd., Jeongam Wind Power Co., Ltd., Korea Power Engineering Service Co., Ltd., Heang 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, AMEC Partners Korea Ltd., Hyundai Energy Co., Ltd., Ecollite Co., Ltd., Taebaek Wind Power Co., Ltd., Taeback 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 Joint ventures (55 joint ventures) Daegu Green Power Co., Ltd., KEPCO SPC Power Corporation, Daejung Offshore Wind Power Co., Ltd., KAPES, Inc., Dangjin Eco Power Co., Ltd., Honam Wind Power 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., GS Donghae Electric Power Co., Ltd., 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, Eco Biomass Energy Sdn. Bhd., 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 Yeonggwang Wind Power Co., Ltd., Chester Solar IV SpA, Chester Solar V SpA, Diego de Almagro Solar SpA, South Jamaica Power Company Limited, Daesan Green Energy Co.,Ltd., RE Holiday Holdings LLC, RE Pioneer Holdings LLC, RE Barren Ridge 1 Holdings LLC, RE Astoria 2 LandCo LLC, RE Barren Ridge LandCo LLC, Laurel SpA, KIAMCO KOWEPO Bannerton Hold Co Pty Ltd, Chile Solar JV SpA, Taebaek Gadeoksan Wind Power Co., Ltd., Cheong-Song Noraesan Wind Power Co., Ltd., Chester Solar I SpA, Solar Philippines Calatagan Corporation Others (2 others) Korea Development Bank, KOWEPO India Private Limited (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, 2016, 2017 and 2018 are as follows: <Sales and Others> Sales and others Company name Transaction type 2016 2017 2018 In millions of won <Associates> Dongducheon Dream Power Co., Ltd. Electricity sales ￦ 15,221 17,041 6,093 Korea Gas Corporation Electricity sales 89,030 88,011 99,933 Daegu Photovoltaic Co., Ltd. Electricity sales — 349 128 Jeongam Wind Power Co., Ltd. Electricity sales 6 30 724 Korea Power Engineering Service Co., Ltd. Service 1,455 1,317 840 KS Solar Co., Ltd. Electricity sales 20 5 — Heang Bok Do Si Photovoltaic Power Co., Ltd. Electricity sales 2 2 2 Korea Electric Power Industrial Development Co., Ltd. Service 10,723 14,044 10,422 Goseong Green Energy Co., Ltd. Electricity sales 9,195 24,069 10,024 Gangneung Eco Power Co., Ltd. Service 5,223 2,391 4,928 Shin Pyeongtaek Power Co., Ltd. Electricity sales 3,579 9,025 8,468 Naepo Green Energy Co., Ltd. Electricity sales 104 185 160 Noeul Green Energy Co., Ltd. Electricity sales 177 32 30 Samcheok Eco Materials Co., Ltd. Electricity sales 64 237 605 YTN Co., Ltd. Electricity sales 1,785 1,987 2,043 Busan Green Energy Co., Ltd. Electricity sales 133 120 19 Gunsan Bio Energy Co., Ltd. Electricity sales 6 — 3,611 Korea Electric Vehicle Charging Service Electricity sales 89 700 578 Ulleungdo Natural Energy Co., Ltd. Service 691 1,013 292 Tamra Offshore Wind Power Co., Ltd. Electricity sales 12 55 58 Daegu clean Energy Co., Ltd. Electricity sales — 421 126 Cheongna Energy Co., Ltd. Service 6,831 7,980 11,688 Gangwon Wind Power Co., Ltd. Electricity sales 1,273 994 2,402 Gwangyang Green Energy Co., Ltd. Electricity sales — — 874 Hyundai Green Power Co., Ltd. Design service 14,835 14,280 14,031 Korea Power Exchange Service 7,141 8,446 6,854 Hyundai Energy Co., Ltd. Service 24,719 15,627 1,718 Taebaek Wind Power Co., Ltd. Service 796 813 614 Pyeongchang Wind Power Co., Ltd. Design service 497 1,176 1,166 Daeryun Power Co., Ltd. Electricity sales 1,516 1,796 1,731 Changjuk Wind Power Co., Ltd. Electricity sales 863 788 758 KNH Solar Co., Ltd. Electricity sales 17 17 17 S-Power Service ￦ 5,994 12,852 9,118 PND solar., Ltd Electricity sales — — 12 Busan Solar Co., Ltd. Electricity sales 8 — — Green Biomass Co., Ltd. Electricity sales 2 — — SPC Power Corporation Dividend income 8,346 5,562 9,549 Gemeng International Energy Co., Ltd. Dividend income 16,476 13,365 11,246 PT. Cirebon Electric Power Dividend income — 550 4,432 Dolphin Property Limited Dividend income 35 — — PT. Bayan Resources TBK Service 160 717 33,817 Nepal Water & Energy Development Company Private Limited Service 375 900 536 Pioneer Gas Power Limited Rental income and others 164 62 26 Xe-Pian Xe-Namnoy Service 773 661 672 PT. Mutiara Jawa Rental income and others — 47 40 <Joint ventures> Daegu Green Power Co., Ltd. Electricity sales 768 1,131 1,022 KEPCO SPC Power Corporation Service 10,344 45,005 43,141 Daejung Offshore Wind Power Co., Ltd. Electricity sales 1 1 1 KAPES, Inc. Commission 1,176 1,420 648 Dangjin Eco Power Co., Ltd. Technical fee 1,787 670 3,424 Honam Wind Power Co., Ltd. Electricity sales 169 552 415 Seokmun Energy Co., Ltd. Service 1,627 1,765 1,897 Incheon New Power Co., Ltd. Construction revenue 524 539 568 Chun-cheon Energy Co., Ltd. Electricity sales 3,079 4,855 2,471 Yeonggwangbaeksu Wind Power Co., Ltd. Electricity sales 1,591 1,654 1,540 Yeonggwang Wind Power Co., Ltd. Electricity sales — — 46 KW Nuclear Components Co., Ltd. Service 3,327 644 839 KEPCO-Uhde Inc. Service 6 34 17 GS Donghae Electric Power Co., Ltd. Electricity sales 12,994 11,204 7,238 Busan Shinho Solar Power Co., Ltd. Electricity sales 210 87 362 Datang Chifeng Renewable Power Co., Ltd. Interest income 8,216 500 19,013 Rabigh Electricity Company Service 699 19,179 29,167 Rabigh Operation & Maintenance Company Limited Service 2,395 2,784 1,707 Datang Chaoyang Renewable Power Co., Ltd. Dividend income — 839 — Shuweihat Asia Power Investment B.V. Dividend income 2,957 1,707 499 Shuweihat Asia Operation & Maintenance Company Service 1,179 1,319 1,046 ASM-BG Service 322 1,062 1,153 Jamaica Public Service Company Limited Service 1,905 — 5,160 KV Holdings, Inc. Dividend income 302 — 735 Datang KEPCO Chaoyang Renewable Co., Ltd. Dividend income 440 — — Amman Asia Electric Power Company Service 21,915 14,205 16,569 Kelar S.A Service 1,702 570 — Nghi Son 2 Power LLC Service — 2,693 25,880 Barakah One Company Service 25,244 7,059 7,777 Nawah Energy Company Service — 34,421 51,144 South Jamaica Power Company Limited Service — — 152 RE Holiday Holdings LLC Dividend income — — 112 RE Pioneer Holdings LLC Dividend income — — 979 RE Barren Ridge 1 Holdings LLC Dividend income — — 1,114 RE Astoria 2 LandCo LLC Dividend income — — 504 RE Barren Ridge LandCo LLC Dividend income — — 202 <Others> Yeongwol Energy Station Co., Ltd. Service 858 830 373 DS POWER Co., Ltd. Service 35,133 5,819 565 Korea Development Bank Electricity sales 3,102 3,239 3,524 Interest income 3,164 1,685 4,438 <Purchase and Others> Purchase and others Company name Transaction type 2016 2017 2018 In millions of won <Associates> Dongducheon Dream Power Co., Ltd. Electricity purchase ￦ 946,463 813,440 828,547 Korea Gas Corporation Purchase of power generation 3,633,198 3,245,519 5,191,243 Daegu Photovoltaic Co., Ltd. REC purchase 3,243 3,646 3,745 Korea Power Engineering Service Service 723 1,292 1,765 KS Solar Co., Ltd. REC purchase 4,080 900 — Heang Bok Do Si Photovoltaic Power Rental fee and others 410 570 455 Korea Electric Power Industrial Development Co., Ltd. Electricity metering service 250,057 289,293 261,668 Gangneung Eco Power Co., Ltd. Service — — 19 Noeul Green Energy Co., Ltd. Service — 15,862 18,282 Samcheok Eco Materials Co., Ltd. Electricity purchase — 14 3,819 YTN Co., Ltd. Advertisement fee 554 731 322 Busan Green Energy Co., Ltd. Service — 12,189 25,123 Korea Electric Vehicle Charging Service Service — 1,093 605 Ulleungdo Natural Energy Co., Ltd. Electricity purchase 60 119 63 Tamra Offshore Wind Power Co., Ltd. Electricity purchase — 2,105 8,371 Cheongna Energy Co., Ltd. Service 73 59 58 Gangwon Wind Power Co., Ltd. Electricity purchase 22,780 25,968 25,407 Hyundai Green Power Co., Ltd. Electricity purchase 469,547 458,378 480,815 Korea Power Exchange Trading Fees 91,433 207,855 137,489 Hyundai Energy Co., Ltd. Electricity purchase 1,313 87,607 3,445 Taebaek Wind Power Co., Ltd. REC purchase 5,741 6,534 8,582 Pyeongchang Wind Power Co., Ltd. Service 1,594 4,033 6,994 Daeryun Power Co., Ltd. Electricity purchase 244,023 146,189 184,063 Changjuk Wind Power Co., Ltd. Electricity purchase 5,786 6,981 7,929 KNH Solar Co., Ltd. Electricity purchase 4,006 3,947 3,586 S-Power Electricity purchase 437,206 457,329 507,875 Busan Solar Co., Ltd. Electricity purchase 1,079 — — Hadong Mineral Fiber Co., Ltd. Service — — 60 Green Biomass Co., Ltd. Woodchip purchase 2,232 1,345 440 YeongGwang Yaksu Wind Electric. Co., Ltd Electricity purchase — — 2,437 Nepal Water & Energy Development Company Private Limited Service — 72 31 <Joint ventures> Daegu Green Power Co., Ltd. Electricity purchase 263,797 252,024 287,008 KAPES, Inc. Service 140,555 164,165 77,758 Honam Wind Power Co., Ltd. Electricity purchase 6,776 5,962 7,700 Seokmun Energy Co., Ltd. REC purchase — 21,674 31,759 Chun-cheon Energy Co., Ltd. REC purchase — 194,136 320,954 Yeonggwangbaeksu Wind Power Co., Ltd. Electricity purchase 11,208 11,124 11,366 GS Donghae Electric Power Co., Ltd. Electricity purchase 903 351,367 780,233 Busan Shinho Solar Power Co., Ltd. REC purchase 6,770 7,984 7,901 Global Trade Of Power System Co., Ltd. Service 882 414 565 Expressway Solar-light Power Generation Co., Ltd. Electricity purchase 2,942 2,941 3,513 ASM-BG Service — — 1 Jamaica Public Service Company Limited Service 127 154 83 Barakah One Company Service — 2,631 1,145 South Jamaica Power Company Limited Service — — 67 <Others> Yeongwol Energy Station Co., Ltd. REC purchase 14,875 14,256 4,019 Korea Development Bank Interest expense 8,231 4,573 5,043 Dividend paid 654,829 418,407 166,876 (4) Receivables and payables arising from related party transactions as of December 31, 2017 and 2018 are as follows: Receivables Payables Company name Type 2017 2018 2017 2018 In millions of won <Associates> Dongducheon Dream Power Co., Ltd. Trade receivables ￦ 2,230 332 — — Non-trade receivables and others 655 298 — — Trade payables — — 77,817 74,651 Non-trade — — — 10 Korea Gas Corporation Trade receivables 9,833 9,439 — — Non-trade 339 498 — — Trade payables — — 524,881 601,092 Non-trade — — 569 314 Daegu Photovoltaic Co., Ltd. Trade payables — — 71 83 Jeongam Wind Power Co., Ltd. Trade receivables — 151 — — Non-trade — — 4 2 Korea Electric Power Industrial Development Co., Ltd. Trade receivables 333 278 — — Non-trade 42 51 — — Non-trade — — 18,006 13,102 Goseong Green Energy Co., Ltd. Non-trade 19 — — — Non-trade — — 7,140 43,020 Gangneung Eco Power Co., Ltd. Trade receivables 1 1 — — Non-trade 4,747 99 — — Shin Pyeongtaek Power Co., Ltd. Trade receivables — 123 — — Non-trade 210 242 — — Non-trade — — 52 82 Naepo Green Energy Co., Ltd. Trade receivables 17 17 — — Noeul Green Energy Co., Ltd. Trade receivables 3 3 — — Non-trade — — 2,041 8,774 Samcheok Eco Materials Co., Ltd. Trade receivables 20 61 — — YTN Co., Ltd. Trade receivables 98 98 — — Non-trade — — 209 11 Busan Green Energy Co., Ltd. Trade receivables 7 1 — — Non-trade 1,691 — — — Non-trade — — — 10,882 Gunsan Bio Energy Co., Ltd. Non-trade — 3,458 — — Korea Electric Vehicle Charging Service Trade receivables 23 69 — — Non-trade — 354 — — Trade payables — — 45 — Non-trade — — — 56 Daegu Clean Energy Co., Ltd. Non-trade — 17 — — Cheongna Energy Co., Ltd. Trade receivables 182 183 — — Non-trade — — 1 — Gangwon Wind Power Co., Ltd. Trade receivables 6 10 — — Trade payables — — 3,033 2,547 Hyundai Green Power Co., Ltd. Trade receivables 946 390 — — Trade payables — — 32,589 38,072 Korea Power Exchange Trade receivables 463 847 — — Non-trade 128 229 — — Non-trade — — 1,142 1,214 Hyundai Energy Co., Ltd. Trade receivables ￦ 49 57 — — Non-trade 6,598 9,664 — — Trade payables — — 223 259 Non-trade — — 13,796 8,021 <Associates> Ecollite Co., Ltd. Non-trade receivables and others 210 210 — — Taebaek Wind Power Co., Ltd. Trade receivables 116 — — — Trade payables — — 533 453 Non-trade — — 121 291 Pyeongchang Wind Power Co., Ltd. Trade receivables 3 4 — — Non-trade — — 163 25 Daeryun Power Co., Ltd. Trade receivables 162 178 — — Trade payables — — 15,706 15,845 Changjuk Wind Power Co., Ltd. Trade receivables 101 — — — Trade payables — — 515 455 Non-trade — — 546 273 KNH Solar Co., Ltd. Trade receivables 1 1 — — Non-trade — — 193 — S-Power Trade receivables 117 922 — — Non-trade 5,183 34 — — Trade payables — — 25,061 56,897 Non-trade — — — 16 Green Biomass Co., Ltd. Non-trade — — 85 — PND solar., Ltd Trade receivables — 3 — — YeongGwang Yaksu Wind Electric. Co., Ltd Trade payables — — — 2,679 SPC Power Corporation Non-trade 76 73 — — Nepal Water & Energy Development Company Private Limited Non-trade 227 311 — — Xe-Pian Xe-Namnoy Non-trade 53 61 — — PT. Mutiara Jawa Non-trade — 10 — — <Joint ventures> Daegu Green Power Co., Ltd. Trade receivables 98 110 — — Non-trade 10 12 — — Trade payables — — 25,257 32,609 KAPES, Inc. Non-trade — 253 — — Trade payables — — 55 — Non-trade — — — 338 Dangjin Eco Power Co., Ltd. Non-trade 1,211 18 — — Non-trade — — 41 — Honam Wind Power Co., Ltd. Trade payables — — 381 432 Non-trade — — 3,013 3,573 Seokmun Energy Co., Ltd. Trade receivables 93 39 — — Non-trade 276 303 — — Non-trade — — 3,052 5,043 Incheon New Power Co., Ltd. Trade receivables ￦ 128 128 — — Chun-cheon Energy Co., Ltd. Trade receivables 129 20 — — Non-trade 252 308 — — Trade payables — — 29,676 33,796 <Joint ventures> Yeonggwangbaeksu Wind Power Trade receivables 7 7 — — Non-trade receivables and others 144 — — — Trade payables — — 619 736 Non-trade — — 1,300 789 Yeonggwang Wind Power Trade receivables — 10 — — KW Nuclear Components Trade receivables 4 4 — — Non-trade — 31 — — KEPCO-Uhde Inc. Non-trade — — 4 4 GS Donghae Electric Power Trade receivables 450 245 — — Non-trade 1,892 2,537 — — Trade payables — — 73,570 69,820 Non-trade — — — 59 Busan Shinho Solar Power Trade receivables 2 2 — — Trade payables — — 159 175 Non-trade — — 811 717 Datang Chifeng Renewable Power Co., Ltd. Non-trade 82 — — — Rabigh Operation & Maintenance Company Limited Non-trade 869 449 — — ASM-BG Non-trade 37 38 — — Jamaica Public Service Company Limited Trade receivables — 594 — — Non-trade — — — 24 Amman Asia Electric Power Company Trade receivables 2,675 — — — Non-trade — — — 18,351 Nawah Energy Company Trade receivables 10,419 29,614 — — Non-trade — 253 — — <Others> Yeongwol Energy Station Trade receivables 7,068 — — — DS POWER Co., Ltd. Trade receivables 340 — — — Korea Development Bank Accrued interest income 204 1,147 — — Non-trade 501,029 12,125 — — Non-trade — — 200 218 Derivatives 569 27,306 22,398 18,095 (5) Loans and others arising from related party transactions as of December 31, 2017 and 2018 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. ￦ 26,341 229 — 1,064 27,634 (Allowance for doubtful accounts) (16,551 ) — 4,072 6,414 (6,065 ) Associates PT. Cirebon Electric Power 15,436 1,283 (8,522 ) 499 8,696 Associates Xe-Pian Xe-Namnoy 1,413 — — — 1,413 Associates PT Wampu Electric Power 13,288 970 — 622 14,880 Associates Gunsan Bio Energy Co., Ltd. 9,396 — — — 9,396 Associates Hyundai Energy Co., Ltd. 2,465 — — — 2,465 (Allowance for doubtful accounts) (2,465 ) — — — (2,465 ) Joint ventures KEPCO SPC Power Corporation 17,249 — (17,715 ) 466 — Joint ventures Datang Chifeng Renewable Power Co., Ltd. 7,245 — (7,440 ) 195 — Joint ventures Nghi Son 2 Power LLC — 4,566 (4,566 ) — — Joint ventures KODE NOVUS II LLC (*) 4,018 — — (4,018 ) — (Allowance for doubtful accounts) (*) (4,018 ) — — 4,018 — Joint ventures Kelar S.A 46,620 — — 2,074 48,694 Joint ventures Daehan Wind Power PSC 1,211 — (606 ) (605 ) — Joint ventures Chester Solar IV SpA 4,607 — (4,607 ) — — Joint ventures Chun-cheon Energy Co., Ltd. — 616 — — 616 ￦ 126,255 7,664 (39,384 ) 10,729 105,264 (*) The loans of KODE NOVUS II LLC is eliminated because the Company sold all of its shares of KODE NOVUS II LLC during the year ended December 31, 2018 as described in note 20. (6) Borrowings arising from related party transactions as of December 31, 2017 and 2018 are as follows: Related parties Type Beginning balance Borrowings Repayment Others Ending balance In millions of won Korea Development Bank Facility ￦ 93,883 1,200 (28,290 ) — 66,793 Others 4,909 — (755 ) — 4,154 Operating funds 61,000 32,000 (12,000 ) — 81,000 Syndicated Loan 16,301 — (125 ) 1,100 17,276 (7) Guarantees provided to associates or joint ventures as of December 31, 2018 are as follows: Primary guarantor Principal obligor Type of guarantees Credit limit Guarantee In millions of won and thousands of foreign currencies Korea Electric Power Corporation Shuweihat Asia Operation & Maintenance Company Performance guarantees USD 11,000 SAPCO Korea Electric Power Corporation Rabigh Operation & Maintenance Company Limited Performance guarantees and others USD 1,387 RABEC Korea Electric Power Corporation Barakah One Company Debt guarantees USD 900,000 Export-Import Bank of Korea and others Performance guarantees and others USD 3,404,275 Export-Import Bank of Korea and others 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 Firstar Development, LLC, Santander Bank and others Korea Electric Power Corporation Nghi Son 2 Power LLC Performance guarantees USD 28,000 SMBC Ho Chi Minh Korea Western Power Co., Ltd. Cheongna Energy Co., Ltd. Collateralized money invested KRW 3,465 KEB Hana Bank and others Guarantees for supplemental funding and others(*1) — KEB Hana Bank and others Korea Western Power Co., Ltd. Xe-Pian Xe-Namnoy Payment guarantees for business reserve USD 2,500 Krung Thai Bank Collateralized money invested KRW 77,165 Krung Thai Bank 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 2,002 Korea Development Bank Korea Western Power Co., Ltd. Dongducheon Dream Power Co., Ltd. Collateralized money invested(*7) KRW 41,389 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 365 Woori Bank Korea Western Power Co., Ltd. Heang Bok Do Si Photovoltaic Power Co., Ltd. Collateralized money invested KRW 202 Nonghyup Bank Korea Western Power Co., Ltd. Shin Pyeongtaek Power Co., Ltd. Collateralized money invested KRW 67,600 Kookmin Bank Guarantees for supplemental funding(*1) — Kookmin Bank Korea East-West Power Co., Ltd. Busan Shinho Solar Power Co., Ltd. Collateralized money invested KRW 4,761 Korea Development Bank and others Korea East-West Power Co., Ltd. Seokmun Energy Co., Ltd. Collateralized money invested KRW 16,751 Kookmin Bank and others Korea East-West Power Co., Ltd. Chun-cheon Energy Co., Ltd. Collateralized money invested KRW 42,505 Kookmin Bank and others Guarantees for supplemental funding(*1) KRW 20,000 Kookmin Bank and others Korea East-West Power Co., Ltd. Honam Wind Power Co., Ltd. Collateralized money invested KRW 4,860 Shinhan Bank and others Korea East-West Power Co., Ltd. GS Donghae Electric Power Co., Ltd. Collateralized money invested KRW 240,591 Korea Development Bank and others Korea East-West Power Co., Ltd. Yeonggwangbaeksu Wind Power Co., Ltd. Collateralized money invested KRW 2,843 Kookmin Bank and others Korea East-West Power Co., Ltd. Yeonggwang Wind Power Co., Ltd. Collateralized money invested KRW 15,304 KDB Capital Corporation and others Korea East-West Power Co., Ltd. Daesan Green Energy Co., Ltd. Collateralized money invested KRW 17,433 IBK Korea East-West Power Co., Ltd. Taebaek Gadeoksan Wind Power Co., Ltd. Collateralized money invested KRW 8,508 Samsung Fire & Marine Insurance Co., Ltd. and others Korea East-West Power Co., Ltd. PT. Tanjung Power Indonesia Debt guarantees USD 46,983 MUFG Bank, Ltd.(MUFG) (formerly, the Bank of Tokyo Mitsubishi UFJ, Ltd.(BTMU)) and others Other guarantees USD 3,150 PT Adaro Indonesia Korea East-West Power Co., Ltd. South Jamaica Power Company Limited Performance guarantees USD 14,400 Societe Generale EWP Barbados 1 SRL South Jamaica Power Company Limited Guarantees for supplemental funding(*1, 3) USD 18,350 JCSD Trustee Services Limited and others Korea Southern Power Co., Ltd. KNH Solar Co., Ltd. Collateralized money invested KRW 2,337 Shinhan Bank and Kyobo Performance guarantees and guarantees for supplemental funding(*1) — Life Insurance Co., Ltd. Korea Southern Power Co., Ltd. Daeryun Power Co., Ltd. Collateralized money invested KRW 26,099 Korea Development Bank and others Guarantees for supplemental funding and others(*1) — Korea Development Bank and others Korea Southern Power Co., Ltd. Changjuk Wind Power Co., Ltd. Collateralized money invested KRW 8,086 Shinhan Bank Guarantees for supplemental funding(*1) — Shinhan Bank Korea Southern Power Co., Ltd. Daegu Green Power Co., Ltd. Collateralized money invested KRW 41,110 Shinhan Bank and others Korea Southern Power Co., Ltd. Kelar S.A Performance guarantees USD 63,707 KEB Hana Bank, SMBC, Mizuho Bank, MUFG, Natixis Korea Southern Power Co., Ltd. Daehan Wind Power PSC Debt guarantees USD 18,200 Shinhan Bank Performance guarantees USD 3,000 Shinhan Bank Guarantees for supplemental funding(*1) — Shinhan Bank Korea Southern Power Co., Ltd. Pyeongchang Wind Power Co., Ltd. Collateralized money invested KRW 5,419 Woori Bank and Shinhan Bank and others Performance guarantees — Woori Bank and Shinhan Bank and others Korea Southern Power Co., Ltd. Taebaek Wind Power Co., Ltd. Guarantees for supplemental funding(*1) — Shinhan Bank and others Korea Southern Power Co., Ltd. Jeongam Wind Power Co., Ltd. Collateralized money invested KRW 4,589 IBK, SK Securities Co., Ltd. and others Performance guarantees — IBK, SK Securities Co., Ltd. and others Korea Southern Power Co., Ltd. Samcheok Eco Materials Co., Ltd. Payment guarantees(*4) — SEM Investment Co., Ltd. Korea Midland Power Co., Ltd. Hyundai Green Power Co., Ltd. Collateralized money invested KRW 127,160 Korea Development Bank and others Korea Midland Power Co., Ltd. PT. Cirebon Electric Power Debt guarantees USD 11,825 Mizuho Bank Korea Midland Power Co., Ltd. PT Wampu Electric Power Debt guarantees USD 4,854 SMBC Korea Midland Power Co., Ltd. YaksuESS Co., Ltd Collateralized money invested KRW 460 Hanwha Life Insurance Co., Ltd. Guarantees for supplemental funding(*1) — Hanwha Life Insurance Co., Ltd. Korea Midland Power Co., Ltd. YeongGwang Yaksu Wind Electric. Co., Ltd Collateralized money invested KRW 533 Hanwha Life Insurance Co., Ltd. and others Korea South-East Power Co., Ltd. Hyundai Energy Co., Ltd. Collateralized money invested(*5) — Korea Development Bank and others Guarantees for supplemental funding and others(*1,6) KRW 78,600 Korea Development Bank and others Korea South-East Power Co., Ltd. RES Technology AD Collateralized money invested KRW 15,209 UniCredit Bulbank and others Korea South-East Power Co., Ltd. ASM-BG Collateralized money invested KRW 21,379 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. S-Power Collateralized money invested KRW 114,566 Korea Development Bank and others Korea South-East Power Co., Ltd. Goseong Green Energy Co., Ltd. Collateralized money invested KRW 2,459 Kyobo Life Insurance Co., Ltd. and others Korea South-East Power Co., Ltd. Gangneung Eco Power Co., Ltd. Collateralized money invested KRW 2,495 Kyobo Life Insurance Co., Ltd. and others Korea South-East Power Co., Ltd. PND solar., Ltd. Collateralized money invested KRW 1,020 IBK and others Korea South-East Power Co., Ltd. Tamra Offshore Wind Power Co., Ltd. Collateralized money invested KRW 10,401 Nonghyup Life Insurance Co., Ltd. and others Korea South-East Power Co., Ltd. Hyundai Eco Energy Co., Ltd. Collateralized money invested KRW 3,388 Samsung Life Insurance and others Korea Hydro & Nuclear Power Co., Ltd. Noeul Green Energy Co., Ltd. Collateralized money invested KRW 8,016 KEB Hana Bank and others Korea Hydro & Nuclear Power Co., Ltd. Busan Green Energy Co., Ltd. Collateralized money invested KRW 12,537 Shinhan Bank and others KEPCO Plant Service & Engineering Co., Ltd. Incheon New Power Co., Ltd. Collateralized money invested KRW 579 Shinhan Bank Guarantees for supplemental funding and others(*1) — Shinhan Bank (*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 14,730 thousand and the total amount of guarantees is USD 8,257.5 thousand which consists of USD 3,670 thousand of EWP (Barbados) 1 SRL’s contribution obligation and USD 4,587.5 thousand of South Jamaica Energy Holding Limited’s portion (50%) of contribution obligation. (*4) The Company has the obligation 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. In relation to this guarantee, the Company has recognized ￦2,155 million of derivative liabilities as of December 31, 2018. (*5) The Company recognized 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 ￦40,898 million as the possibility of economic outflow to fulfill the obligation was 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) As of December 31, 2018, there is no financial guarantee contract provided by related parties. (9) Derivatives transactions with related parties as of December 31, 2018 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 2016~2019 ￦ 105,260 USD 100,000 2.48 % 2.38 % ￦ 1,052.60 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 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 2018~2023 320,880 USD 300,000 2.03 % 3.75 % 1,069.60 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 2018.12.18 2019.01.22 11,279 USD 10,000 1,127.85 2018.12.13 2019.01.10 4,490 USD 4,000 1,122.60 2018.12.24 2019.01.10 13,497 USD 12,000 1,124.74 2018.12.21 2019.01.15 10,103 USD 9,000 1,122.50 2018.12.27 2019.01.23 11,207 USD 10,000 1,120.68 2018.12.28 2019.01.23 13,412 USD 12,000 1,117.64 (10) Salaries and other compensations to the key members of management of the Company for the years ended December 31, 2016, 2017 and 2018 are as follows: Type 2016 2017 2018 In millions of won Salaries ￦ 1,463 1,271 1,106 Employee benefits 33 54 24 ￦ 1,496 1,325 1,130

Non-Cash Transactions

Non-Cash Transactions	12 Months Ended
	Dec. 31, 2018
Non-Cash Transactions [Abstract]
Non-Cash Transactions	51. Non-Cash Significant non-cash Transactions 2016 2017 2018 In millions of won Transfer from construction-in-progress ￦ 19,971,599 13,676,233 8,656,252 Recognition of asset retirement cost and related provision for decommissioning costs 470,941 2,494,802 310,272 Transfer from provision for disposal of spent nuclear fuel to accrued expenses 283,675 342,861 482,699

Commitments for Expenditure

Commitments for Expenditure	12 Months Ended
	Dec. 31, 2018
Commitments for Expenditure [Abstract]
Commitments for Expenditure	52. Commitments for Expenditure (1) The commitments for acquisition of property, plant and equipment as of December 31, 2017 and 2018 are as follows: 2017 2018 Contracts Amounts Balance Amounts Balance In millions of won Purchase of switch (25.8kV Eco) 12,450 ￦ 50,526 35,494 50,526 — Purchase of cable (PVC,1C,2000SQ) 153,000M and others (Shin-Bupyung-Youngseo) 50,256 42,857 56,183 37,309 Purchase of cable (PVC, 1C, 2500SQ) 103,374M and others (Bukdangjin-Shintangjung) 42,500 29,987 44,315 31,801 Purchase of GIS (362KV 6300A 63KA) 23CB – YoungseoS/S 34,500 34,500 34,500 34,500 Purchase of GIS (362KV 6300A 63KA) 27CB – KwangyangS/S 37,476 18,044 37,694 10,491 Purchase of GIS (800KV 8000A 50KA) 10CB – Shin-JungbuS/S 63,730 44,955 63,730 — Purchase of transformer (765/345/23kV 666.7MVA, 2TANK) 6 units – Shin-JungbuS/S 37,500 37,500 37,500 — Purchase of cable (TR CNCE-W/AL,1C,400SQ) 78,076 76,762 78,076 — Purchase of Concrete Poles (10M, 350KGF) 121,900 and 6 others 133,387 112,981 133,387 13,343 Advanced E-Type 65,408 64,592 65,408 — Purchase of Ground Switch (44-D-A125, 56,482 55,990 56,482 — Purchase of cable (TR CNCE-W/AL,1C,400SQ) — — 66,240 38,998 Purchase of cable (FR CNCO-W,1C,325SQ) — — 57,475 48,598 Purchase of switch (Eco) 9,360 units — — 40,631 34,797 Construction of Shin-Kori units (#3,4) 7,363,514 93,637 7,363,514 3,211 Construction of Shin-Kori units (#5,6) 8,625,387 6,757,146 8,625,387 5,930,099 Construction of Shin-Hanul units (#1,2) 7,982,342 1,015,813 7,982,342 355,704 Construction of Shin-Hanul units (#3,4)(*) 8,261,818 8,097,056 — — Other 26 contracts 262,400 114,041 269,681 161,243 Purchase of main machine for construction of Seoul Combined units (#1,2) 361,203 99,031 365,164 51,165 Construction of Seoul Combined units (#1,2) 227,685 60,568 285,890 27,125 Purchase of smoke eliminating machine for construction of Shin-Boryeong units (#1,2) 169,544 36,417 172,609 13,986 Service of designing Shin-Boryeong units (#1,2) 127,810 16,371 120,199 1,076 Purchase of main machine for construction of Shin-Boryeong units (#1,2) 866,065 4,981 866,065 4,981 Construction of Shin-Boryeong units (#1,2) 316,190 23,100 309,466 — Purchase of furnace for construction of Shin-Seocheon thermal power plant 302,030 222,555 305,209 74,631 Purchase of turbine generator for construction of Shin-Seocheon thermal power plant 104,402 83,522 104,402 57,968 Electricity construction of Shin-Seocheon thermal power plant 200,453 196,993 217,848 174,122 Purchase of main machine for Jeju LNG combined 166,287 15,409 166,287 11,272 Purchase of coal handling machine for construction of Taean (#9,10) and IGCC units (conditional contract for installation) 193,375 5,129 205,764 282 Purchase of furnace for construction of Taean units (#9,10) 566,945 33,817 556,504 18,502 Service of designing Taean units (#9,10) 111,322 13,671 112,344 13,338 Purchase of turbine generator for construction of Taean units (#9,10) 205,267 550 214,462 10,422 Purchase of oxygen plant for construction of Taean IGCC units 94,564 199 96,068 1,552 Service of designing Taean IGCC plant units 44,802 2,669 46,001 3,161 Purchase of furnace for construction of Samcheok units (#1,2) 1,082,641 5,963 1,092,287 12,215 Purchase of coal handling machine for construction of Samcheok units (#1,2) 304,924 52,362 307,925 48,736 Service of designing Samcheok units (#1,2) 114,047 4,745 103,679 — Purchase of turbine main equipment for Samcheok units (#1,2) 215,333 874 212,188 348 Purchase of main equipment for Namjeju — — 146,594 134,949 (*) The Company recognized impairment loss in relation to Shin-Hanul unit 3 and 4, and there are no legally binding commitments for expenditure as of December 31, 2018. (2) As of December 31, 2018, 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 2018 ~ 2030 48,162 Ton U3O8 Transformed 2018 ~ 2030 23,484 Ton U Enrichment 2018 ~ 2030 25,530 Ton SWU Molded 2018 ~ 2022 520 Ton U

Contingencies and Commitments

Contingencies and Commitments	12 Months Ended
	Dec. 31, 2018
Contingencies and Commitments [Abstract]
Contingencies and Commitments	53. Contingencies and Commitments (1) Ongoing litigations and claims related with contingent liabilities and contingent assets as of December 31, 2017 and 2018 are as follows: 2017 2018 Number Claim Number Claim In millions of won As the defendant 565 ￦ 477,719 570 673,882 As the plaintiff 185 690,934 174 793,491 As of December 31, 2018, 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 2,167 individuals) filed a lawsuit against NSSC 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, 2018. Also, Greenpeace and others filed an administrative litigation against NSSC requesting cancelation of the construction permit of Shin-Kori unit 5 and 6, which was ongoing as of December 31, 2018. The Company joined these litigations as a stakeholder with the permission of the Court. As described in note 2.(4), on June 15, 2018, the board of directors of KHNP, a subsidiary of KEPCO, has decided to shut down the Wolsong unit 1. Accordingly, the Company recognized a full impairment loss of ￦570,408 million. Also, the provision for decommissioning costs of the Wolsong unit 1 has increased by ￦28,196 million as the timing of actual cash outflows was accelerated due to the shortened operating period. As of December 31, 2018, 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 for 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 outflow related to the obligation, if any. 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. Based on the agreement with the creditors of Gyeonggi Green Energy, as Gyeonggi Green Energy was unable to renew the fuel cell supply contract by December 31, 2018, the creditors have the right to request immediate repayment of the related borrowings from Gyeonggi Green Energy or to take over the all shares held by KHNP. Depending on the result of this negotiation, the schedule of repayment of borrowings of Gyeonggi Green Energy Co., Ltd. may be adjusted accordingly. As of December 31, 2018, Gyeonggi Green Energy Co., Ltd. is in negotiations to renew the contract. The Company is the defendant against a number of claims. The followings are potentially significant ongoing claims pertaining to the Company. ① Hyundai Engineering & Construction Co., Ltd. (“Hyundai E&C”), SK Engineering & Construction Co., Ltd. and GS Engineering & Construction Co., Ltd. filed a lawsuit for increase in contract bill against KHNP in September 2013, in relation to the design changes on the plant construction of Shin-Hanul 1 & 2. KHNP has paid the claim amounts in full upon the first ruling and believes that the contingent liabilities related to the other pending lawsuits are not significant. ② 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 outflow is probable on the ongoing and the expected lawsuit. For this reason, the Company recognized ￦39,139 million of other provision in relation to the lawsuit as of December 31, 2018. Except these significant ongoing claims, there are 12 arbitration cases pertaining to the Company as of December 31, 2018 and the significant arbitration cases for the year ended December 31, 2018 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 Hyundai Samsung Joint Venture (HSJV), one of the subcontractors of the Company, filed an arbitration against the Company at the London Court of International Arbitration (LCIA) in 2016 due to disagreements in UAE nuclear power plant construction project, but the Company has not recognized any losses because the probability of economic benefit outflow is remote and the related amount cannot be reasonably estimated. ③ 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 29.(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. ④ In 2016, Halla Corporation filed on arbitration against the Company to the Korea Commercial Arbitration Board in relation to the request for additional construction costs and the Company filed on 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 of provision for the best estimate of the expenditure required to fulfill its obligations in relation to this arbitration as of December 31, 2018. ⑤ In connection with 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 losses because the probability of economic benefit outflow is remote and the related amount cannot be reasonably estimated. (2) Guarantees of payments and commitments provided to other companies as of December 31, 2017 and 2018 are as follows: ① In order to secure its status as a shareholder of Navanakorn Electric Co., Ltd., the Company has signed a fund supplement contract. According to the contract, in case Navanakorn Electric Co., Ltd. does not have sufficient funds for its operation or repayment of borrowings, the Company bears a payment obligation in proportion to its ownership. ② 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. ③ The Company has provided PT. Perusahaan Listrik Negara performance guarantee up to USD 2,293 thousand and Mizuho bank and others investment guarantee up to USD 43,500 thousand 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. ④ 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. ⑤ 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. ⑥ 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. (3) Credit lines provided by financial institutions as of December 31, 2018 are as follows: Commitments Financial institutions Currency Limited amount Exercised amount In millions of won and thousands of foreign Commitments on bank-overdraft Nonghyup Bank and KRW 1,855,000 167,010 Commitments on bank-daylight overdraft Nonghyup Bank KRW 280,000 — Limit amount available for CP KEB Hana Bank and KRW 1,050,000 — Limit amount available for card KEB Hana Bank and KRW 55,904 2,740 Banco de Oro PHP 5,000 5,000 Loan limit Kookmin Bank and KRW 1,238,500 612,197 DBS Bank and USD 1,840,700 20,000 Certification of payment on payables from foreign country Kookmin Bank and USD 44,680 4,754 Certification of payment on L/C Shinhan Bank and USD 992,434 252,392 Certification of performance guarantee on contract KEB Hana Bank and EUR 4,158 4,158 KEB Hana Bank and INR 237,321 237,321 Korea Development JPY 637,322 637,322 Seoul Guarantee Insurance and others KRW 89,335 72,802 First Abu Dhabi USD 923,915 830,314 KEB Hana Bank SAR 6,508 6,508 Bank of Kathmandu NPR 36,304 36,304 KEB Hana Bank CAD 617 617 Certification of bidding KEB Hana Bank and USD 110,000 3,199 Shinhan Bank ZAR 55,730 55,730 Advance payment bond, Warranty bond, Retention bond and others Export-Import Bank USD 3,934,928 3,220,418 Others Shinhan Bank JPY 381,210 381,210 Nonghyup Bank and KRW 307,436 7,088 Export-Import Bank USD 1,171,470 842,897 Inclusive credit Shinhan Bank INR 70,028 70,028 KEB Hana Bank KRW 258,000 12,278 KEB Hana Bank and USD 30,930 18,245 Trade finance BNP Paribas and USD 800,000 — (4) As of December 31, 2018, 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 Korea Southern Power Co., Ltd. Korea Development Bank and others Shareholdings of DS Power Co., Ltd. KRW 916 Collateral for borrowings Mira Power Limited International Finance Corporation and others Property, plant and equipment and others USD 275,600 Collateral for borrowings(*2) Gyeonggi Green Energy Co., Ltd. Korea Development Bank and others Cash and cash equivalents KRW 327,080 Collateral for borrowings(*1) Commerce and Industry Energy Co., Ltd. IBK and others Land, buildings, structures and machinery and others KRW 110,500 Collateral for borrowings(*1) KOSPO Youngnam Power Co., Ltd. Shinhan Bank and others Cash and cash equivalents KRW 396,120 Collateral for borrowings(*1) 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(*1) Korea Offshore Wind Power Co., Ltd Woori Bank and others Utility plant and others KRW 293,400 Collateral for borrowings 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(*2) KST Electric Power Company The Export—Import Bank of Korea and others Finance lease receivable and property, plant and equipment and others USD 337,000 Collateral for borrowings(*2) (*1) As of December 31, 2018, the Company has established guarantees for pledge for transfer of rights of long-term borrowings, pledge for insurance claims, pledge for shares, etc. (*2) This is based on the amount of loan commitment limit. The Company has ￦1,197 million of project loans from Korea Energy Agency as of December 31, 2018. The Company has provided a blank check as repayment guarantee. (5) The Company temporarily suspended operations of the Gangneung hydroelectric generating plant, with a carrying amount of ￦81,900 million as of December 31, 2018, to improve the quality of water used in generating electricity. The expenses related to the suspension of operations of ￦47 million and depreciation on the utility plant of ￦6,547 million are recorded in other expenses for the year ended December 31, 2018. 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, 2018. (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, 2018. The book value of facility is ￦17,522 million and the amount of trade receivables related to the companies residing in Gaeseong industrial complex is ￦2,911 million. The ultimate outcome of this event cannot be reasonably estimated. (7) As of December 31, 2018, five subsidiaries of KEPCO, including Korea South-East Power Co., Ltd., have entered into consecutive voyage charter contracts with shipping companies, including Korea Line Corporation, for the stable transportation of overseas bituminous coal used for power generation. As of December 31, 2018, there are 73 vessels under contract and the average remaining contract period is about 9 years.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	54. Subsequent Events Subsequent to December 31, 2018, Korea Midland Power Co., Ltd., Korea Western Power Co., Ltd. and Korea East-West Power Co., Ltd. issued foreign bond, corporate bonds and non-guaranteed Company Name Type Issue date Maturity Interest rate (%) Amount In millions of won and thousands of foreign currencies Korea Midland Power Co., Ltd. #7 foreign bond 2019.01.22 2022.01.22 3.38 % USD 300,000 #47-1 2019.02.08 2039.02.08 2.19 % KRW 160,000 #47-2 2019.02.08 2049.02.08 2.17 % KRW 120,000 Korea Western Power Co., Ltd. #2 Swiss Franc bond 2019.02.27 2024.02.27 0.13 % CHF 200,000 Korea East-West Power Co., Ltd. #32-1 non-guaranteed 2019.03.07 2039.03.07 2.18 % KRW 40,000 #32-2 non-guaranteed 2019.03.07 2049.03.07 2.16 % KRW 40,000 On January 9, 2019, Korea Western Power Co., Ltd., a subsidiary of KEPCO, has completed the liquidation of KOWEPO India Private Limited, which was classified as assets held-for-sale.

Basis of Preparation (Policies)

Basis of Preparation (Policies)	12 Months Ended
	Dec. 31, 2018
Basis of Preparation [Abstract]
Statement of compliance	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”), which is KEPCO’s functional and presentation currency.
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) Unbilled revenue Energy delivered but not metered nor billed is estimated at the reporting date based on consumption statistics and selling price estimates. Determination of the unbilled revenues at the end of the reporting period is sensitive to the estimated consumptions and prices based on statistics. Unbilled revenue recognized as of December 31, 2017 and 2018 are ￦1,672,385 million and ￦1,671,117 million, respectively. (ii) 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. 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 and other expenses as described in note 21, note 40 and note 53. 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 21 and note 53, 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 20 – Investments in Associates and Joint Ventures • Note 21 – Property, Plant and Equipment • Note 23 – Construction Services Contracts • Note 48 – 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 28 – Employment Benefits • Note 44 – Income Taxes
Changes in accounting policies	Changes in accounting policies The Company has initially applied IFRS 9 ‘Financial Instruments’ and IFRS 15 ‘Revenue from Contracts with Customers’ from January 1, 2018. Due to the transition methods chosen by the Company in applying these standards, comparative information throughout these financial statements has not been restated to reflect the requirements of the new standards. (i) IFRS 9 ‘Financial Instruments’ IFRS 9 sets out requirements for recognizing and measuring financial assets, financial liabilities and certain contracts to buy or sell non-financial The Company has taken an exemption not to restate comparative information for prior periods upon adoption of IFRS 9. Accordingly, the information presented for 2017 and 2016 has not been restated and differences in the carrying amounts of financial instruments resulting from the adoption of IFRS 9 are recognized in retained earnings and other components in equity at January 1, 2018. ① Classification and measurement of financial assets and financial liabilities IFRS 9 contains three principal classification categories for financial assets: measured at amortized cost, FVOCI and FVTPL. The classification of financial assets under IFRS 9 is generally based on the business model in which a financial assets is managed and its contractual cash flow characteristics. Under IFRS 9, derivatives embedded in contracts where the host is a financial asset in the scope of the standard are never separated. Instead, the hybrid financial instrument as a whole is assessed for classification. The adoption of IFRS 9 has not had a significant effect on the Company’s accounting policies related to financial liabilities and derivative financial instruments (for derivatives that are used as hedging instruments). The following table reconciles the carrying amounts of financial assets under IAS 39 to the carrying amounts under IFRS 9 on transition to IFRS 9 on January 1, 2018. Original classification under IAS 39 New classification under IFRS 9 Original carrying amount under IAS 39 New carrying amount under IFRS 9 In millions of won Financial assets at FVTPL FVTPL ￦ 111,512 111,512 Loans and receivables Amortized cost 15,203,663 14,405,570 Loans and receivables FVTPL — 791,324 Available-for-sale FVOCI 699,833 471,903 Available-for-sale FVTPL — 227,930 Held-to-maturity Amortized cost 3,144 3,144 Total financial assets (excluding derivative instruments) ￦ 16,018,152 16,011,383 ② Impairment of financial assets IFRS 9 replaces the ‘incurred loss’ model in IAS 39 with an ‘expected credit loss’ (ECL) model. The new impairment model applies to financial assets measured at amortized cost and debt investments at FVOCI, but not to investments in equity instruments. The Company has used an exemption not to restate comparative information for prior periods with respect to classification and measurement (including impairment) requirements. Differences in the carrying amounts of financial assets resulting from the adoption of IFRS 9 are recognized in other components of equity and retained earnings as at January 1, 2018 as follows: Equity attributable to owners Type Retained earnings Other of equity Non- controlling interests Total equity In millions of won Reclassification of cumulative gain or loss of available-for-sale ￦ 76,851 (76,851 ) — — Remeasurement of expected credit loss —Trade and other receivables (6,769 ) — — (6,769 ) —Income tax effect 1,846 — — 1,846 Total ￦ 71,928 (76,851 ) — (4,923 ) The detailed accounting policies under IFRS 9 are described in note 3.(21). (ii) IFRS 15 ‘Revenue from Contracts with Customers’ IFRS 15 ‘Revenue from Contracts with Customers’ replaced IAS 18 ‘Revenue’, IAS 11 ‘Construction Contracts’, SIC-31 Under IFRS 15, revenue is recognized when a customer obtains control of the goods or services. Determining the timing of the transfer of control at a point in time or over time requires judgment. The Company has retrospectively applied this standard and recognized the cumulative effect of the adoption of IFRS 15 at the date of initial application (January 1, 2018) and has retrospectively applied IFRS 15 to only those contracts that were not completed as of the date of initial application (January 1, 2018). Accordingly, the Company has not restated the comparative periods. IFRS 15 did not have a significant impact on the Company’s consolidated financial statements at the date of initial application (January 1, 2018). For additional information about the Company’s accounting policies relating to revenue recognition, see note 3.(7). (iii) IFRIC 22 ‘Foreign Currency Transactions and Advance Consideration’ The Company has adopted IFRIC 22 ‘Foreign Currency Transactions and Advance Consideration’ since January 1, 2018. IFRIC 22 ‘Foreign Currency Transactions and Advance Consideration’ clarifies the date of the transaction for the purpose of determining the exchange rate to use on initial recognition of the related asset, expense or income, when an entity has received or paid advance consideration in a foreign currency. Upon adoption of the interpretation, there is no significant impact on the Company’s consolidated financial statements. (iv) Amendments to IAS 40 ‘Investment Property’ The Company has adopted amendments to IAS 40 ‘Investment Property’ since January 1, 2018. Amendments to IAS 40 ‘Investment Property’ clarify when an entity should transfer a property asset to, or from, investment property. Upon adoption of the amendments, there is no significant impact on the Company’s consolidated financial statements.
Standards issued but not yet effective	Standards issued but not yet effective A number of new standards are effective for annual periods beginning after January 1, 2018 and earlier application is permitted; however, the Company has not early adopted the new or amended standards in preparing these consolidated financial statements. (i) IFRS 16 ‘Leases’ ① General information IFRS 16 replaces existing leases guidance, including IAS 17 ‘Leases’, IFRIC 4 ‘Determining whether an Arrangement contains a Lease’, SIC-15 SIC-27 The Company plans to apply IFRS 16 retrospectively with the cumulative effect of initially applying the standard recognized at the date of initial application on January 1, 2019. Therefore, the cumulative effect of adopting IFRS 16 will be recognized as an adjustment to the opening balance of retained earnings (or other component of equity, as appropriate) at January 1, 2019, with no restatement of comparative information. For a contract that is, or contains, a lease, and the Company shall account for each lease component within the contract as a lease separately from non-lease right-of-use low-value non-lease non-lease Lessor accounting remains similar to the existing guidance IAS 17 ‘Leases’—i.e. lessors continue to classify leases as finance or operating leases. ② Identifying a lease The Company assesses whether the contract is, or contains, a lease at inception of a contract and also shall identify whether the contract is, or contains, a lease at the date of initial application. The definition of this new standard is mainly related to the control model. This standard classifies a lease contract and a service contract based on whether the identified asset is controlled by the customer. If the customer has all of the following rights, right-of-use • Right to obtain substantially all of the economic benefits from use of the identified asset • Right to direct the use of the identified asset The Company is still evaluating whether certain agreements related to the use of vessels, real estate and facilities contain leases that shall be accounted for in accordance with IFRS 16 as of the authorization date for issuance of these consolidated financial statements. ③ Lessee accounting The adoption of IFRS 16 will change the accounting of operating leases, which was previously not included in the consolidated statements of financial position under IAS 17, and at the date of initial application of IFRS 16, the Company shall account for all leases, except for short-term leases and leases of low-value • recognizes the present value of the lease payments that are not paid at the date of initial recognition in the consolidated statements of financial position as right-of-use • recognizes the depreciation charge for right-of-use • classifies cash payments for the principal portion (financial activities) and for the interest portion (operating activities) in the consolidated statements of cash flows ④ Lessor accounting Under IFRS 16, a lessor continues to classify each of its leases as either a finance leases or an operating leases. However, under IFRS 16, a lessor shall disclose additional information such as the nature of the lessor’s leasing activities and how the lessor manages the risk associated with any rights it retains in underlying assets. The Company has been analyzing the impact of the adoption of IFRS 16 on its consolidated financial statements. However, it is practically difficult to provide reasonable estimates of the impact until the Company has completed such analysis.

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
Significant Accounting Policies [Abstract]
Basis of consolidation	Basis of consolidation The consolidated financial statements are the financial statements of a group in which the assets, liabilities, equity, income, expenses and cash flows of the parent and its subsidiaries are presented as those of a single economic entity. Subsidiaries are 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, the income 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 income 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	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 income 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 income 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 income or loss on the disposal of the related assets or liabilities, the Company reclassifies the gain or loss from equity to income 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 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.
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) Identify the performance obligations in the contract The Company is engaged in the generation, transmission and distribution of electricity and development of electric power resources, and electricity sales revenue accounts for 93.8% of consolidated revenue for the year ended December 31, 2018. Under IFRS 15, supplying electricity is a series of distinct goods or services identified as a single performance obligation. The Company is also engaged in contracts with customers for transmission and distribution, provision of power generation byproducts, EPC business, O&M, etc. that are identified as separate performance obligations for each contract. (ii) Variable consideration The Company may be subject to a variation of consideration paid by the customer due to the progressive electricity billing system, discounts on electricity bills for policy purposes, penalties and delinquent payment, etc. The Company estimates an amount of variable consideration by using the expected value method that the Company expects to better predict the amount of consideration to which it will be entitled, and includes in the transaction price some or all of an amount of variable consideration 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. (iii) Performance obligations satisfied over time The Company satisfies its performance obligations for contracts such as EPC business, O&M, etc. over time. The Company recognizes revenue based on the percentage-of-completion The Company recognizes revenue over time if one of the following criteria is met: (a) the customer simultaneously receives and consumes the benefits provided by the Company’s performance as the entity performs; (b) the Company’s performance creates or enhances an asset that the customer controls as the asset is created or enhanced; or (c) the Company’s performance does not create an asset with an alternative use to the entity and the entity has an enforceable right to payment for performance completed to date.
Leases	Leases The Company classifies and accounts for leases as either a finance or operating lease, depending on the terms. Leases where the Company assumes substantially all of the risks and rewards of ownership are classified as finance leases. All other leases are classified as operating leases. (i) The Company as lessor Amounts due from lessees under finance leases are recognized as receivables at the amount of the Company’s net investment in the leases. Finance lease income is allocated to accounting periods so as to reflect a constant periodic rate of return on the Company’s net investment outstanding in respect of the leases. Rental income from operating leases is recognized on a straight-line basis over the term of the relevant lease. Initial direct costs incurred in negotiating and arranging an operating lease are added to the carrying amount of the leased asset and recognized on a straight-line basis over the lease term. (ii) The Company as lessee Leases are classified as finance leases whenever the terms of the lease transfer substantially all the risks and rewards of ownership to the lessee. All other leases are classified as operating leases. Assets held under finance leases are initially recognized as assets of the Company at their fair value at the inception of the lease or, if lower, at the present value of the minimum lease payments. The corresponding liability to the lessor is included in the statement of financial position as a finance lease obligation. Lease payments are apportioned between finance expenses and reduction of the lease obligation so as to achieve a constant rate of interest on the remaining balance of the liability. Finance expenses are recognized immediately in income or loss, unless they are directly attributable to qualifying assets, in which case they are capitalized in accordance with the Company’s general policy on borrowing costs. Contingent rentals are recognized as expenses in the periods in which they are incurred. Operating lease payments are recognized as an expense on a straight-line basis over the lease term, except where another systematic basis is more representative of the time pattern in which economic benefits from the leased asset are consumed. Contingent rentals arising under operating leases are recognized as an expense in the period in which they are incurred. In the event that lease incentives are received to enter into operating leases, such incentives are recognized as a liability. The aggregate benefit of incentives is recognized as a reduction of rental expense on a straight-line basis, except where another systematic basis is more representative of the time pattern in which economic benefits from the leased asset are consumed. (iii) Determining whether an arrangement contains a lease At inception of an arrangement, the Company determines whether the arrangement is or contains a lease. At inception or on reassessment of an arrangement that contains a lease, the Company separates payments and other consideration required by the arrangement into those for the lease and those for other elements on the basis of their relative fair values. If the Company concludes for a finance lease that it is impracticable to separate the payments reliably, then an asset and a liability are recognized at an amount equal to the fair value of the underlying asset.
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.(23) 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 income 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 income or loss in the period in which they are incurred.
Government grants	Government grants and income related to transfer of assets from customers 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. The Company recovers a substantial amount of the cost related to its electric power distribution facilities from customers through the transfer of assets, while the remaining portion is recovered through electricity sales from such customers in the future. As such, the Company believes there exists a continued service obligation to the customers when the Company receives an item of property, equipment, or cash for constructing or acquiring an item of property or equipment, in exchange for supplying electricity to customers. The Company defers the amounts received, which are subsequently recognized as other income on a straight-line basis over the estimated service period which does not exceed the transferred asset’s useful life.
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. 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 income 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 Finance lease assets 6 ~ 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. As a result of such annual review, useful lives of certain structures and machinery were changed during the year ended December 31, 2018. Depreciation expenses decreased by ￦25,985 million for the year ended December 31, 2018. Depreciation expenses are expected to decrease by ￦157,333 million and ￦170,471 million for the years ending December 31, 2019 and 2020, respectively, and to increase by ￦353,789 million for the years after December 31, 2020. 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 income 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 income 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 income 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 ~ 20 Straight line Software 4, 5 Straight line Industrial rights 5 ~ 10 Straight line Development expenses 5 Straight line Leasehold rights 10 Straight line Mining right — Unit of production Others 3 ~ 50 or Indefinite Straight line (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 income 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, unless the relevant asset is carried at a revalued amount, in which case the impairment loss is treated as a revaluation decrease. 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, unless the relevant asset is carried at a revalued amount, in which case the reversal of the impairment loss is treated as a revaluation increase.
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 principal and interest (SPPI) Other than SPPI To collect contractual cash flows Amortized cost FVTPL(*2) Both collecting contractual cash flows and selling financial assets FVOCI(*1) 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) the 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 it 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 income or loss immediately unless the derivative is designated and effective as a hedging instrument, in such case the timing of the recognition in income 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 income 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 as income or loss as of 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 income 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 income or loss in the periods when the hedged item is recognized in income 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 income or loss. When a forecast transaction is no longer expected to occur, the gain or loss accumulated in equity is recognized immediately in income or loss.

Reporting Entity (Description_2

Reporting Entity (Description of the controlling company) (Tables)	12 Months Ended
	Dec. 31, 2018
Reporting Entity (Description of the controlling company) [Abstract]
The Company's shareholders	As of December 31, 2018, KEPCO’s share capital amounts to ￦3,209,820 million and KEPCO’s shareholders are as follows: Number of shares Percentage of ownership Government of the Republic of Korea 116,841,794 18.20 % Korea Development Bank 211,235,264 32.90 % Foreign investors 173,769,250 27.07 % Other 140,117,769 21.83 % 641,964,077 100.00 %

Basis of Preparation (Tables)

Basis of Preparation (Tables)	12 Months Ended
	Dec. 31, 2018
Basis of Preparation [Abstract]
Classification and measurement of financial assets and financial liabilities	The following table reconciles the carrying amounts of financial assets under IAS 39 to the carrying amounts under IFRS 9 on transition to IFRS 9 on January 1, 2018. Original classification under IAS 39 New classification under IFRS 9 Original carrying amount under IAS 39 New carrying amount under IFRS 9 In millions of won Financial assets at FVTPL FVTPL ￦ 111,512 111,512 Loans and receivables Amortized cost 15,203,663 14,405,570 Loans and receivables FVTPL — 791,324 Available-for-sale FVOCI 699,833 471,903 Available-for-sale FVTPL — 227,930 Held-to-maturity Amortized cost 3,144 3,144 Total financial assets (excluding derivative instruments) ￦ 16,018,152 16,011,383
Impairment of financial assets	The Company has used an exemption not to restate comparative information for prior periods with respect to classification and measurement (including impairment) requirements. Differences in the carrying amounts of financial assets resulting from the adoption of IFRS 9 are recognized in other components of equity and retained earnings as at January 1, 2018 as follows: Equity attributable to owners Type Retained earnings Other of equity Non- controlling interests Total equity In millions of won Reclassification of cumulative gain or loss of available-for-sale ￦ 76,851 (76,851 ) — — Remeasurement of expected credit loss —Trade and other receivables (6,769 ) — — (6,769 ) —Income tax effect 1,846 — — 1,846 Total ￦ 71,928 (76,851 ) — (4,923 )

Significant Accounting Polici_3

Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2018
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 Finance lease assets 6 ~ 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 ~ 20 Straight line Software 4, 5 Straight line Industrial rights 5 ~ 10 Straight line Development expenses 5 Straight line Leasehold rights 10 Straight line Mining right — Unit of production Others 3 ~ 50 or Indefinite Straight line

Segment, Geographic and Other_2

Segment, Geographic and Other Information (Tables)	12 Months Ended
	Dec. 31, 2018
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 arms-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, 2016, 2017 and 2018, respectively, are as follows: 2016 Segment Total segment revenue Intersegment revenue Revenue from external customers Depreciation and amortization Interest income Interest expense Profit (loss) related to associates and joint ventures Employee benefit expense Loss on abandonment of property, plant, and equipment Increase in provisions, net Operating profit (loss) In millions of won Transmission and distribution ￦ 59,862,284 1,890,489 57,971,795 3,226,700 80,882 844,200 (128,402 ) 162,326 424,356 711,430 5,274,308 Electric power generation (Nuclear) 11,168,579 11,129,385 39,194 3,130,820 33,111 474,590 (1,082 ) 70,582 — 576,223 3,770,165 Electric power generation (Non-nuclear) 21,394,223 20,561,044 833,179 2,523,306 24,171 359,607 (8,342 ) 79,846 2,133 276,619 3,211,684 Plant maintenance & engineering service 2,618,388 2,190,207 428,181 98,843 10,672 2,156 478 86,268 — 221,301 210,680 Others 567,836 77,098 490,738 26,817 115,928 97,926 — 1,050 30 168 76,336 Consolidation adjustments (35,848,223 ) (35,848,223 ) — (45,498 ) (22,986 ) (25,611 ) — (26,319 ) — (3,009 ) (246,813 ) ￦ 59,763,087 — 59,763,087 8,960,988 241,778 1,752,868 (137,348 ) 373,753 426,519 1,782,732 12,296,360 Finance income 791,543 Finance expense (2,437,087 ) Loss related to associates and joint ventures (137,348 ) Profit before income tax ￦ 10,513,468 2017 Segment Total segment revenue Intersegment revenue Revenue from external customers Depreciation and amortization Interest income Interest expense Profit (loss) related to associates and joint ventures Employee benefit expense Loss on abandonment of property, plant, and equipment Increase in provisions, net Operating profit (loss) 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 Profit 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 )
Information related to segment assets and liabilities	2017 Segment Segment Investments Acquisition of non-current Segment In millions of won Transmission and distribution ￦ 106,540,154 3,366,309 6,606,512 50,757,798 Electric power generation (Nuclear) 55,011,096 11,843 2,083,967 29,252,816 Electric power generation (Non-nuclear) 47,938,084 1,904,224 3,250,524 26,337,295 Plant maintenance & engineering service 3,273,959 48,320 145,779 1,176,627 Others 7,798,400 — 569,447 3,013,743 Segment totals 220,561,693 5,330,696 12,656,229 110,538,279 Consolidation adjustments: Elimination of inter-segment amounts (39,517,829 ) — 23,616 (5,239,156 ) Equity method adjustment 754,314 — — — Deferred taxes 2,215 — — 5,339,450 Others (11,478 ) — — (1,814,299 ) (38,772,778 ) — 23,616 (1,714,005 ) Consolidated totals ￦ 181,788,915 5,330,696 12,679,845 108,824,274 2018 Segment Segment 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
Geographic information	Electric sales, the main operations of the Company, are conducted in the Republic of Korea where the controlling company is located. The following information on revenue from external customers and non-current Geographical unit Revenue from external customers Non-current assets(*2) 2016 2017 2018 2016 2017 2018 In millions of won Domestic ￦ 55,310,011 55,652,807 57,799,991 148,297,677 153,436,810 157,037,428 Overseas(*1) 4,453,076 3,683,082 2,233,071 4,474,699 4,497,535 3,299,346 ￦ 59,763,087 59,335,889 60,033,062 152,772,376 157,934,345 160,336,774 (*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	Information on significant customers There is no individual customer comprising more than 10% of the Company’s revenue for the years ended December 31, 2016, 2017 and 2018.

Classification of Financial I_2

Classification of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2018
Classification of Financial Instruments [Abstract]
Classification of financial assets	Classification of financial assets as of December 31, 2017 and 2018 are as follows: 2017 Financial Loans and Available-for-sale Held-to-maturity Derivative assets Total In millions of won Current assets Cash and cash equivalents ￦ — 2,369,739 — — — 2,369,739 Current financial assets Held-to-maturity — — — 5 — 5 Derivative assets 12,923 — — — 12 12,935 Other financial assets — 1,945,417 — — — 1,945,417 Trade and other receivables — 7,928,972 — — — 7,928,972 12,923 12,244,128 — 5 12 12,257,068 Non-current Non-current Available-for-sale — — 699,833 — — 699,833 Held-to-maturity — — — 3,139 — 3,139 Derivative assets 9,097 — — — 10,594 19,691 Other financial assets 111,512 1,204,738 — — — 1,316,250 Trade and other receivables — 1,754,797 — — — 1,754,797 120,609 2,959,535 699,833 3,139 10,594 3,793,710 ￦ 133,532 15,203,663 699,833 3,144 10,606 16,050,778 2018 Financial Financial assets Financial 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
Classification of financial liabilities	Classification of financial liabilities as of December 31, 2017 and 2018 are as follows: 2017 Financial liabilities at fair value through profit or loss Financial liabilities Derivative liabilities Total In millions of won Current liabilities Borrowings ￦ — 1,165,985 — 1,165,985 Debt securities — 7,957,300 — 7,957,300 Derivative liabilities 51,090 — 20,177 71,267 Trade and other payables — 5,999,521 — 5,999,521 51,090 15,122,806 20,177 15,194,073 Non-current Borrowings — 2,434,624 — 2,434,624 Debt securities — 43,189,483 — 43,189,483 Derivative liabilities 99,839 — 256,953 356,792 Trade and other payables — 3,223,480 — 3,223,480 99,839 48,847,587 256,953 49,204,379 ￦ 150,929 63,970,393 277,130 64,398,452 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
Classification of comprehensive income (loss) from financial instruments	Classification of comprehensive income (loss) from financial instruments for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 2017 2018 In millions of won Cash and cash equivalents Interest income ￦ 61,380 35,474 40,704 Financial assets at fair value through profit or loss Interest income — — 21,713 Gain on valuation of derivatives — — 34,117 Gain on transaction of derivatives — — 39,114 Gain on valuation of financial assets — — 1,879 Gain on disposal of financial assets — — 1,837 Financial assets at fair value through profit or loss Interest income — 290 — Gain (loss) on valuation of derivatives 113,671 (214,100 ) — Loss on transaction of derivatives (8,039 ) (37,266 ) — Gain on valuation of financial assets — 12 — Financial assets at fair value through other comprehensive income Dividends income — — 12,777 Available-for-sale Dividends income 9,446 11,477 — Impairment loss on available-for-sale financial assets (86,703 ) (2,713 ) — Gain (loss) on disposal of available-for-sale 1,473 (1,213 ) — Financial assets at amortized cost Interest income — — 89 Held-to-maturity Interest income 97 82 — Loans and receivables Interest income 25,106 30,014 21,925 Trade and other receivables Interest income 102,237 102,727 90,390 Short-term financial instruments Interest income 45,763 29,412 41,025 Long-term financial instruments Interest income 7,195 8,144 7,920 Other financial assets Interest income — — 1 Derivative assets (applying hedge accounting) Gain (loss) on valuation of derivatives (profit or loss) 145,458 (41,129 ) 69,799 Gain on valuation of derivatives (equity, before tax)(*) 50,047 2,453 8,600 Gain (loss) on transaction of derivatives (13,994 ) (58,299 ) 34,152 Financial liabilities at fair value through profit or loss Loss on valuation of derivatives — — (4,650 ) Gain on transaction of derivatives — — 36,046 Financial liabilities at fair value through profit or loss Gain (loss) on valuation of derivatives 23,225 (179,879 ) — Gain (loss) on transaction of derivatives 17,045 (27,175 ) — Financial liabilities carried at amortized cost Interest expense of borrowings and debt securities (1,202,065 ) (1,240,727 ) (1,320,516 ) Loss on retirement of financial liabilities (23,000 ) (5 ) — Interest expense of trade and other payables (68,375 ) (57,160 ) (42,830 ) Interest expense of others (482,428 ) (491,665 ) (505,112 ) Gain (loss) on foreign currency transactions and translations (290,485 ) 1,075,215 (356,159 ) Derivative liabilities (applying hedge accounting) Gain (loss) on valuation of derivatives (profit or loss) 5,714 (439,559 ) 53,937 Gain (loss) on valuation of derivatives (equity, before tax)(*) (3,297 ) 29,431 (15,029 ) Gain (loss) on transaction of derivatives (51,450 ) (46,221 ) 37,985 (*) Items are included in other comprehensive income or loss. All other income and gain amounts listed above are included in finance income, and all expense and losses listed above are included in finance expenses in the consolidated statements of comprehensive income or loss.

Restricted Deposits (Tables)

Restricted Deposits (Tables)	12 Months Ended
	Dec. 31, 2018
Restricted Deposits [Abstract]
Restricted Deposits	Restricted deposits as of December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Cash and cash equivalents Escrow accounts ￦ 53 — Deposits for government project 15,365 12,747 Collateral provided for borrowings 79,569 100,998 Collateral provided for lawsuit 2 3 Deposits for transmission regional support program 2,320 4,337 Decommissioning costs of nuclear power plants — 604 Short-term financial instruments Bidding guarantees 119 — Restriction on withdrawal related to ‘win-win for small and medium enterprises 34,000 34,000 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 Financial assets at fair value through profit or loss Decommissioning costs of nuclear power plants 108,512 — Non-current available-for-sale Decommissioning costs of nuclear power plants 214,156 — Long-term financial instruments Escrow accounts — 69 Guarantee deposits for checking account 2 — Guarantee deposits for banking accounts at oversea branches 302 315 Decommissioning costs of nuclear power plants 337,234 245,896 Funds for developing small and medium enterprises(*) 200,000 200,000 ￦ 991,634 1,126,975 (*) Deposits for small and medium enterprise at IBK and others for construction of Bitgaram Energy Valley and support for the high potential businesses as of December 31, 2017 and 2018.

Cash and Cash Equivalents (Tabl

Cash and Cash Equivalents (Tables)	12 Months Ended
	Dec. 31, 2018
Cash and Cash Equivalents [Abstract]
Cash and Cash Equivalents	Cash and cash equivalents as of December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Cash ￦ 132 138 Other demand deposits 968,966 927,650 Short-term deposits classified as cash equivalents 559,239 211,424 Short-term investments classified as cash equivalents 841,402 219,133 ￦ 2,369,739 1,358,345

Trade and Other Receivables (Ta

Trade and Other Receivables (Tables)	12 Months Ended
	Dec. 31, 2018
Trade and Other Receivables [Abstract]
Trade and Other Receivables	Trade and other receivables as of December 31, 2017 and 2018 are as follows: 2017 Gross amount Allowance for doubtful accounts Present value discount Book value In millions of won Current assets Trade receivables ￦ 7,499,285 (173,583 ) — 7,325,702 Other receivables 614,212 (9,199 ) (1,743 ) 603,270 8,113,497 (182,782 ) (1,743 ) 7,928,972 Non-current Trade receivables 449,191 — (414 ) 448,777 Other receivables 1,380,983 (68,809 ) (6,154 ) 1,306,020 1,830,174 (68,809 ) (6,568 ) 1,754,797 ￦ 9,943,671 (251,591 ) (8,311 ) 9,683,769 2018 Gross amount Allowance for doubtful accounts Present value discount Book value 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
Other receivables	Other receivables as of December 31, 2017 and 2018 are as follows: 2017 Gross amount Allowance for doubtful accounts Present value discount Book value In millions of won Current assets Non-trade ￦ 314,256 (9,199 ) — 305,057 Accrued income 54,002 — — 54,002 Deposits 228,317 — (1,743 ) 226,574 Finance lease receivables 13,067 — — 13,067 Others 4,570 — — 4,570 614,212 (9,199 ) (1,743 ) 603,270 Non-current Non-trade 112,983 (59,117 ) — 53,866 Accrued income 182 — — 182 Deposits 331,071 — (6,154 ) 324,917 Finance lease receivables 849,554 — — 849,554 Others 87,193 (9,692 ) — 77,501 1,380,983 (68,809 ) (6,154 ) 1,306,020 ￦ 1,995,195 (78,008 ) (7,897 ) 1,909,290 2018 Gross amount Allowance for doubtful accounts Present value discount Book value 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
Aging analysis of trade receivables	Aging analysis of trade receivables as of December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Trade receivables: (not overdue) ￦ 7,698,604 7,419,648 Trade receivables: (overdue, not impaired) 7,117 — Less than 60 days 7,117 — Trade receivables: (impairment reviewed) 242,755 298,735 Less than 60 days — 2,525 60 ~ 90 days 39,070 37,266 90 ~ 120 days 17,502 16,033 120 days ~ 1 year 55,242 46,204 Over 1 year 130,941 196,707 7,948,476 7,718,383 Less: allowance for doubtful accounts (173,583 ) (215,868 ) Less: present value discount (414 ) (448 ) ￦ 7,774,479 7,502,067
Aging analysis of other receivables	Aging analysis of other receivables as of December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Other receivables: (not overdue) ￦ 1,810,075 2,075,601 Other receivables: (overdue, not impaired) 47,532 — Less than 60 days 47,532 — Other receivables: (impairment reviewed) 137,588 149,423 Less than 60 days — 24,782 60 ~ 90 days 44 1,007 90 ~ 120 days 1,017 10,997 120 days ~ 1 year 11,042 23,991 Over 1 year 125,485 88,646 1,995,195 2,225,024 Less: allowance for doubtful accounts (78,008 ) (104,726 ) Less: present value discount (7,897 ) (8,928 ) ￦ 1,909,290 2,111,370
Changes in the allowance for doubtful accounts	Changes in the allowance for doubtful accounts for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 2017 2018 Trade Other Trade Other Trade Other In millions of won Beginning balance ￦ 51,956 91,746 71,985 87,661 173,583 78,008 Effect of change in accounting policy — — — — 6,641 128 Loss allowance as at January 1, 2018 under IFRS 9 — — — — 180,224 78,136 Bad debt expense 38,719 233 126,714 1,778 41,498 17,817 Write-off (18,939 ) (928 ) (32,995 ) (3,129 ) (7,696 ) (244 ) Reversal — (5,489 ) — (2,166 ) (1,726 ) (143 ) Others 249 2,099 7,879 (6,136 ) 3,568 9,160 Ending balance ￦ 71,985 87,661 173,583 78,008 215,868 104,726

Financial Assets at Fair Valu_3

Financial Assets at Fair Value through Profit or Loss (Tables)	12 Months Ended
	Dec. 31, 2018
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 are as follows: 2018 Current Non-current In millions of won Financial assets at fair value through profit or loss(*3) Beneficiary securities(*1) ￦ 100 320,148 Cooperative(*1) — 5,052 Other(*2) 313,793 83,586 313,893 408,786 Financial assets designated as at fair value through profit or loss(*3) Debt with embedded derivatives(*2) — 187,483 Other — 10,773 — 198,256 ￦ 313,893 607,042 (*1) For the year ended December 31, 2017, the Company had designated the financial assets as available-for-sale (*2) For the year ended December 31, 2017, the Company had designated the financial assets as long-term/short-term financial instrument (note 2.(5)). (*3) As of December 31, 2018, the Company invested ￦528,006 million exclusively for payment of decommissioning costs of nuclear power plants.

Financial Assets at Fair Valu_4

Financial Assets at Fair Value through Other Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2018
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 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 (*) As described in note 2.(5), these financial assets were classified as available-for-sale
Financial Assets at Fair Value through Other Comprehensive Income	Financial assets at fair value through other comprehensive income as of December 31, 2018 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 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 Corporation 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 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 2018 Shares Ownership Acquisition Book value Fair value In millions of won 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 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 2018 Shares Ownership Acquisition Book value Fair value In millions of won 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 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 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 % — — — 2018 Shares Ownership Acquisition Book value Fair value In millions of won 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 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 Sayaaq 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 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 % — — — 2018 Shares Ownership Acquisition Book value Fair value In millions of won 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 cannot 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 financial assets at FVOCI in other comprehensive income or loss during the year ended December 31, 2018. (*4) The number of shares owned has changed due to capital reduction without refund (3:1), the stock merge (10,000:1) and the stock split (1:2,000) during the year ended December 31, 2018 (*5) As described in note 20, this is reclassified to financial assets at FVOCI 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.

Available-for-sale Financial _2

Available-for-sale Financial Assets (Tables)	12 Months Ended
	Dec. 31, 2018
Available-for-sale Financial Assets [Abstract]
Changes in available-for-sale financial assets	Changes in available-for-sale 2017 Beginning Acquisition Disposal(*1) Valuation Impairment Others Ending In millions of won Listed ￦ 268,171 106 — 8,156 (97 ) (1,883 ) 274,453 Unlisted 746,561 233,179 (461,423 ) (2,908 ) (2,616 ) (87,413 ) 425,380 ￦ 1,014,732 233,285 (461,423 ) 5,248 (2,713 ) (89,296 ) 699,833 Short-term available-for-sale ￦ — — — — — — — Long-term available-for-sale ￦ 1,014,732 233,285 (461,423 ) 5,248 (2,713 ) (89,296 ) 699,833 (*1) The Company recognized gain and loss on disposal of available-for-sale
Available-for-sale financial assets	Available-for-sale 2017 Shares Ownership Acquisition Book value Fair value In millions of won Listed Korea District Heating Corp. 2,264,068 19.55 % ￦ 173,201 165,277 165,277 Ssangyong Motor Co., Ltd. 38,568 0.03 % 428 197 197 Sungjee Construction. Co., Ltd. 10,530 0.01 % 49 8 8 Korea Line Corp. 18 0.00 % 1 — — Namkwang Engineering & Construction Co., Ltd. 46 0.00 % 15 — — Bumyang Construction Co., Ltd.(*7) 35 0.00 % 2 — — ELCOMTEC Co., Ltd. 32,875 0.04 % 217 72 72 PAN ocean Co., Ltd. 1,492 0.00 % 14 8 8 Dongbu Corporation(*6) 955 0.02 % 12 10 10 KSP Co., Ltd. 6,324 0.08 % 24 24 24 STX Heavy Industries Co., Ltd. 35,749 0.14 % 191 165 165 PT Adaro Energy Tbk 480,000,000 1.50 % 71,554 70,531 70,531 Energy Fuels Inc. 1,711,814 2.38 % 16,819 3,300 3,300 Baralaba Coal Company Limited 99,763 0.07 % 18,445 22 22 Denison Mines Corp. 58,284,000 10.42 % 84,134 34,292 34,292 Fission 3.0 300,000 0.14 % — 15 15 Fission Uranium Corp. 800,000 0.16 % 785 532 532 365,891 274,453 274,453 Unlisted Korea investment—Korea EXIM Bank CERs Private Special Asset Investment Trust I 1,758,731,002 14.18 % 1,752 571 — Troika Overseas Resource Development Private Equity Firm 13,340,012,100 3.66 % 13,340 1,553 — IBK-AUCTUS 152 6.29 % 41 41 — Global Dynasty Overseas Resource Development Private Equity Firm 2,242,437,289 7.46 % 2,242 2,242 — 2017 Shares Ownership Acquisition Book value Fair value In millions of won Intellectual Discovery, Ltd. 1,000,000 8.81 % ￦ 5,000 954 — Hanwha-KOSEP New Renewable Energy Private Special Assets Investment Trust 1 4,176,751,013 5.00 % 4,328 4,328 — Construction Guarantee(*2) 571 0.02 % 601 833 833 Plant & Mechanical Contractors Financial Cooperative of Korea 144 0.03 % 126 126 — Fire Guarantee 40 0.01 % 20 20 — Korea Software Financial Cooperative 5,186 1.09 % 3,301 3,301 — Engineering Financial Cooperative 486 0.05 % 60 60 — Electric Contractors Financial Cooperative 1,000 0.04 % 216 216 — Korea Specialty Contractor Financial Cooperative 476 0.01 % 417 417 — Information & Communication Financial Cooperative 121 0.02 % 26 26 — Korea Electric Engineers Association 400 0.24 % 40 40 — Samsung investment—Investment Pool for Public funds 1(*5) — — 53,220 53,739 53,739 Korea investment—Hanwha KT Master Lease Private Special Investment — — 26,586 26,591 26,591 Kyobo Royal-Class Repo Plus Fixed Income 1Y 2nd(*5) — — 33,000 33,008 33,008 Kyobo Royal-Class Repo Plus Fixed Income 2Y 1st(*5) — — 50,000 50,399 50,399 Kyobo Royal-Class Repo Plus A1 ABCP 1Y(*5) — — 50,000 50,419 50,419 Hwan Young Steel Co., Ltd. 10,916 0.14 % 1,092 97 — SAMBO AUTO. Co., Ltd. 15,066 0.02 % 38 38 — Mobo Co., Ltd. 504 0.00 % 14 14 — Dae Kwang Semiconductor Co., Ltd. 589 0.07 % 6 6 — Sanbon Department Store 828 0.01 % 124 3 — Miju Steel Mfg. Co., Ltd. 99,804 0.23 % 50 50 — Sungwon Co., Ltd. 589 0.07 % 15 15 — Hana Civil Engineering Co., Ltd. 23 0.00 % 1 1 — KC Development Co., Ltd. 839 0.02 % 6 6 — IMHWA Corp. 329 0.11 % 5 5 — DALIM Special Vehicle Co., Ltd. 58 0.08 % 10 10 — ASA JEONJU Co., Ltd. 34,846 1.34 % 697 69 — Moonkyung Silica Co., Ltd. 42 0.56 % — — — Sungkwang Timber Co., Ltd. 9 0.34 % 4 4 — Yongbo Co., Ltd. 61 0.20 % 3 3 — HJ Steel Co., Ltd. 218 0.07 % 2 2 — KS Remicon Co., Ltd. 12 0.04 % 3 3 — Joongang Platec Co., Ltd. 3,591 0.75 % 72 35 — Pyungsan SI Ltd. 434 0.01 % 9 9 — Samgong Development Co., Ltd. 12 0.01 % 7 7 — Joongang Development Co., Ltd. 540 0.12 % 8 8 — AJS Co., Ltd. 12,906 0.23 % 32 32 — SHIN-E 119 0.13 % 10 10 — MSE Co., Ltd. 429 0.13 % 9 9 — Ilrim Nano Tec Co., Ltd. 1,520 0.07 % 15 15 — Youngjin Hi-Tech 2,512 0.25 % 126 21 — Buyoung Co., Ltd. 270 0.00 % 3 3 — 2017 Shares Ownership Acquisition Book value Fair value In millions of won Ilsuk Co., Ltd. 152 0.17 % ￦ 10 10 — Dongyang Telecom Co., Ltd. 1,760 0.01 % 11 11 — Jongwon Remicon Co., Ltd. 31 0.18 % 13 13 — Ace Heat Treating Co., Ltd. 477 1.43 % 72 72 — Zyle Daewoo Motor Sales Co., Ltd. 22 0.00 % — — — Daewoo Development Co., Ltd. 8 0.00 % — — — Seyang Inc. 537 0.05 % 27 27 — Seungri Enterprise Co., Ltd. 93 0.05 % 3 3 — Onggane Food Co., Ltd 5 0.07 % 1 1 — Shin-E 12 0.00 % 1 1 — Ejung Ad Co., Ltd. 132 0.09 % 3 3 — Solvus Co., Ltd. 1,056 0.04 % 3 3 — Myung Co., Ltd. 89 0.05 % 2 2 — Shinil Engineering Co., Ltd. 887 0.06 % 3 3 — Biwang Industry Co., Ltd 406 0.04 % 2 2 — Huimun Co., Ltd. 263 0.26 % 4 4 — Young Sung Co., Ltd. 89 0.40 % 26 26 — Yuil Industrial Electronics Co., Ltd. 804 0.32 % 15 15 — DN TEK Inc. 12,401 0.29 % 61 5 — Kwang Jin Structure Co., Ltd. 3,072 0.60 % 31 31 — Woojin Industry Corporation 3 0.00 % 16 16 — Kwang Sung Industry Co., Ltd. 325 0.35 % 7 7 — Futech Mold Co., Ltd. 274 0.27 % 14 14 — Woojoo Environment Ind. Co., Ltd. 101 0.11 % 13 13 — CHONGATTI Agricultural Co., Inc. 57 0.10 % 4 4 — Hyungji Esquire Co., Ltd. 55 0.02 % 22 22 — Kolmar Pharma Co., Ltd. 1,426 0.01 % 52 3 — Morado Co., Ltd. 209 0.04 % 2 2 — Myung Sung Tex Co., Ltd. 20 0.00 % 2 2 — Kwang Sung Co., Ltd. 610 0.53 % 31 31 — EverTechno. Co., Ltd. 29,424 0.73 % 148 7 — Autowel Co., Ltd. 260 0.38 % 14 14 — Woobang Construction Co., Ltd. 8 0.00 % 8 8 — Shin Pyung Co., Ltd. 6 0.03 % 3 3 — JMC Heavy Industries Co., Ltd. 2,724 0.10 % 27 27 — Najin Steel Co., Ltd. 37 0.06 % 5 5 — Sinkwang Industry Co., Ltd. 1,091 1.68 % 5 5 — Crystal Co., Ltd. 22 0.07 % 2 2 — Elephant & Friends Co., Ltd. 563 0.61 % 3 3 — Mireco Co., Ltd. 109 0.25 % 11 11 — L&K Industry Co., Ltd. 1,615 0.60 % 24 24 — JO Tech Co., Ltd. 1,263 0.62 % 25 25 — Kendae Printing Co., Ltd. 422 0.60 % 21 21 — Dauning Co., Ltd. 231 0.41 % 6 6 — Korea Trecision Co., Ltd. 22 0.45 % 5 5 — Ace Track Co., Ltd. 3,130 1.08 % 219 59 — Taebok Machinery Co., Ltd. 109 1.08 % 11 11 — Yoo-A 105 0.20 % 11 11 — Dung Hwan Co., Ltd. 531 0.02 % 5 5 — Hurim Biocell Co., Ltd. 113 0.00 % 5 5 — Sunjin Power Tech Co., Ltd. 4,941 0.92 % 247 32 — Smart Power Co., Ltd. 133,333 4.83 % 200 200 — 2017 Shares Ownership Acquisition Book value Fair value In millions of won Haseung Industries Co., Ltd. 55 0.62 % ￦ 28 28 — Beer Yeast Korea Inc. 1,388 0.43 % 7 7 — Daeryung Corporation 207 0.19 % 10 10 — Korea Bio Red Ginseng Co., Ltd. 194 0.09 % 10 10 — ENH Co., Ltd. 1,086 0.19 % 54 54 — B CON Co., Ltd. 96 1.16 % 6 6 — Chunil Metal Co., Ltd. 11 0.15 % 4 4 — SsangMa Machine Co., Ltd. 4 0.05 % 1 1 — SinJin Co., Ltd. 233 0.30 % 9 9 — Ace Integration Co., Ltd 105 0.09 % 24 24 — AceInti Agricultural Co., Ltd. 16 0.02 % 5 5 — KyungDong Co., Ltd. 130 0.01 % 1 1 — ChunWon Development Co., Ltd. 193 0.19 % 39 39 — WonIl Co., Ltd. 999 0.15 % 50 50 — SungLim Industrial Co., Ltd. 29 0.03 % 1 1 — Korea Minerals Co., Ltd. 191 0.05 % 134 1 — HyoDong Development Co., Ltd. 119 0.15 % 24 24 — Haspe Tech Co., Ltd. 652 0.55 % 20 20 — JoHyun Co., Ltd. 350 1.56 % 18 18 — KC Co., Ltd. 5,107 0.17 % 3 3 — SeongJi Industrial Co., Ltd. 41 0.05 % 1 1 — DongKwang SD, Inc. 524 0.23 % 13 13 — Dong Yang Metal Co., Ltd. 2,951 1.97 % 15 15 — Seyang Precision Ind. Co., Ltd. 829 0.23 % 41 41 — Dooriwon Food System Co., Ltd. 13 0.27 % 1 1 — ShinShin Co., Ltd 339 1.12 % 17 17 — Kitorang Co., Ltd. 165 0.24 % 49 49 — Sung Kwang Co., Ltd. 23 0.37 % 6 6 — Hyundai Metal Co., Ltd. 3,757 5.60 % 1,416 1,416 — Shinheung petrol. Co. Ltd. 699 0.14 % 7 7 — Force TEC Co., Ltd. 3,501 0.02 % 18 18 — Haisung TPC Co., Ltd. 10,751 0.24 % 54 54 — Samsung Tech Co., Ltd. 486 1.28 % 97 97 — Tae Hyung Co., Ltd. 28 0.43 % 20 20 — Samyangplant Co., Ltd. 323 0.60 % 16 16 — Younil Metal Co., Ltd. 41 0.21 % 21 21 — Myungjin Tech Co., Ltd. 20 0.54 % 4 4 — Hankook Machine Tools Co., Ltd. 719 0.14 % 72 72 — Hankook Precision Ind Co., Ltd. 110 0.06 % 11 11 — Borneo International Furniture Co., Ltd. 64,037 0.28 % 97 14 — CJ Paradise Co., Ltd 24 0.02 % 12 12 — Han Young Technology Company Co., Ltd. 35 0.00 % — — — Jungdo Aluminium Co., Ltd. 8,527 0.35 % 128 128 — Ilheung Metal Co, Ltd. 280 0.83 % 28 28 — STX Offshore & Shipbuilding Co., Ltd 8,622 0.25 % 1,078 1,078 — Ptotronics Co., Ltd. 151 0.07 % 2 2 — NFT Co., Ltd. 136 0.40 % 8 8 — Echoroba Co., Ltd. 157 0.02 % 3 3 — Hyundaitech Co., Ltd. 1,363 0.87 % 27 27 — Eco Alux Co., Ltd. 239 0.22 % 48 48 — Daekyung Industry Co., Ltd. 9,112 0.94 % 13 13 — Dasan Material Co. Ltd. 29 0.04 % — — — 2017 Shares Ownership Acquisition Book value Fair value In millions of won Fish World Co., Ltd. 47 0.21 % ￦ 2 2 — SG Shinsung Engineering and Construction Co., Ltd. 10 0.00 % 6 6 — Samdo Industry Electric Co., Ltd. 48 0.02 % 1 1 — Taejung Industries Co., Ltd. 9,268 0.30 % 5 5 — Shinsei Trading Co., Ltd. 64 0.72 % 1 1 — Dynamic Co., Ltd. 111 0.19 % 3 3 — Green Alchemy Co., Ltd. 38,202 1.48 % 191 191 — IQ Power Asia Inc. 16,179 0.31 % 81 81 — Youone TBM Engineering & Construction Co., Ltd. 227,854 0.27 % 31 31 — KM Leatech 1,648 0.98 % 8 8 — Wonil T&I Co., Ltd. 229 0.17 % 23 23 — Semist Co., Ltd. 555 0.80 % 3 3 — DS POWER Co., Ltd.(*8) 580,000 2.34 % 2,900 1,223 1,223 Navanakorn Electric Co., Ltd.(*3) 4,442,800 26.93 % 17,216 16,410 — PT. Kedap Sayaaq 671 10.00 % 18,540 — — Set Holding(*4) 1,100,220 2.50 % 229,255 171,242 171,242 PT. Cirebon Energi Prasarana 22,420 10.00 % 2,612 2,401 — 522,782 425,380 387,454 ￦ 888,673 699,833 661,907 (*1) Investments in unlisted equity securities held by the Company for which a quoted market price does not exist in an active market and fair value cannot be measured reliably were measured at cost less impairment, if any. (*2) The Company has estimated the fair value of the investment in Construction Guarantee based upon the price which would be applied when the investment is returned. The Company has recognized the difference between its fair value and book value as a gain or loss on valuation of available-for-sale (*3) Although the Company holds more than 20% of the equity shares of these investments, the Company cannot exercise significant influence. (*4) 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 (*5) As of December 31, 2017, the Company invested in ￦214,156 million as beneficiary securities exclusively for payment of decommissioning cost of nuclear power plants. The Company has measured the fair value of the beneficiary securities based on its net asset value. (*6) The number of shares owned has changed due to the stock merge (9:7) during the year ended December 31, 2017. (*7) The number of shares increased due to the stock split (5:1). (*8) As described in note 20, this is reclassified to available-for-sale

Financial Assets at Amortized_2

Financial Assets at Amortized Cost (Tables)	12 Months Ended
	Dec. 31, 2018
Financial Assets at Amortized Cost [Abstract]
Financial Assets at Amortized Cost	Financial assets at amortized cost as of December 31, 2018 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 Financial bonds 11,000 — — — 11,000 ￦ 14,042 — — — 14,042 Current ￦ 11,956 — — — 11,956 Non-current 2,086 — — — 2,086

Held-to-maturity Investments (T

Held-to-maturity Investments (Tables)	12 Months Ended
	Dec. 31, 2018
Held-to-maturity Investments [Abstract]
Held-to-maturity Investments	Held-to-maturity 2017 Beginning balance Acquisition Disposal Others Ending balance In millions of won Government bonds ￦ 3,244 250 (350 ) — 3,144 ￦ 3,244 250 (350 ) — 3,144 Current ￦ 114 — (113 ) 4 5 Non-current 3,130 250 (237 ) (4 ) 3,139

Derivatives (Tables)

Derivatives (Tables)	12 Months Ended
	Dec. 31, 2018
Derivatives [Abstract]
Derivatives	Derivatives as of December 31, 2017 and 2018 are as follows: 2017 2018 Current Non-current Current Non-current In millions of won Derivative assets Currency forward ￦ 45 — 2,128 12,606 Currency swap 12 15,711 39,979 43,436 Interest rate swap — 2,697 — 2,342 Others(*1) 12,878 1,283 — 1,844 ￦ 12,935 19,691 42,107 60,228 Derivative liabilities Currency forward ￦ 7,862 1,278 1,956 — Currency swap 61,997 296,098 14,881 233,690 Interest rate swap 1,408 59,416 1,439 58,042 Others(*2) — — 2,155 — ￦ 71,267 356,792 20,431 291,732 (*1) The Company has a put option to sell shares of DS POWER Co., Ltd. and the fair value of the option is recorded in ‘Others’. (*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’.
Currency forward contracts which are not designated as hedge instruments	Currency forward contracts which are not designated as hedge instruments as of December 31, 2018 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 KEB Hana Bank 2014.04.10 2021.07.12 ￦ 55,120 USD 52,000 ￦ 1,060.00 KEB 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 KEB Hana Bank 2014.05.09 2021.07.12 104,600 USD 100,000 1,046.00 KEB 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 Mizuho Bank 2018.11.28 2019.01.02 6,768 USD 6,000 1,127.95 Mizuho Bank 2018.12.07 2019.01.11 11,169 USD 10,000 1,116.90 CCB 2018.12.11 2019.01.14 11,280 USD 10,000 1,127.96 Nonghyup Bank 2018.12.17 2019.01.22 11,295 USD 10,000 1,129.45 Korea Development Bank 2018.12.18 2019.01.22 11,279 USD 10,000 1,127.85 Morgan Stanley 2018.12.19 2019.01.23 11,233 USD 10,000 1,123.30 Standard Chartered 2018.12.19 2019.01.24 11,235 USD 10,000 1,123.50 Kookmin Bank 2018.12.20 2019.01.28 11,273 USD 10,000 1,127.25 Woori Bank 2018.12.20 2019.01.28 11,272 USD 10,000 1,127.15 KEB Hana Bank 2018.12.21 2019.01.29 13,459 USD 12,000 1,121.60 Morgan Stanley 2018.12.24 2019.01.30 11,289 USD 10,000 1,128.87 CCB 2018.12.26 2019.01.31 11,246 USD 10,000 1,124.60 Standard Chartered 2018.12.26 2019.01.31 5,624 USD 5,000 1,124.75 Nonghyup Bank 2018.12.27 2019.02.01 5,610 USD 5,000 1,121.90 KEB Hana Bank 2018.12.27 2019.02.01 5,606 USD 5,000 1,121.15 Standard Chartered 2018.12.28 2019.02.07 5,589 USD 5,000 1,117.80 KEB Hana Bank 2018.12.28 2019.02.07 5,584 USD 5,000 1,116.70 Mizuho Bank 2018.12.28 2019.02.07 11,172 USD 10,000 1,117.15 Societe Generale 2018.11.29 2019.01.04 11,206 USD 10,000 1,120.60 ING Bank 2018.12.20 2019.01.15 11,279 USD 10,000 1,127.89 ING Bank 2018.12.26 2019.01.23 11,248 USD 10,000 1,124.77 Nova Scotia 2018.12.07 2019.01.10 14,518 USD 13,000 1,116.80 Mizuho Bank 2018.12.06 2019.01.04 11,167 USD 10,000 1,116.67 Credit Agricole 2018.12.27 2019.01.23 11,208 USD 10,000 1,120.75 Korea Development Bank 2018.12.13 2019.01.10 4,490 USD 4,000 1,122.60 Korea Development Bank 2018.12.24 2019.01.10 13,497 USD 12,000 1,124.74 Korea Development Bank 2018.12.21 2019.01.15 10,103 USD 9,000 1,122.50 Korea Development Bank 2018.12.27 2019.01.23 11,207 USD 10,000 1,120.68 Korea Development Bank 2018.12.28 2019.01.23 13,412 USD 12,000 1,117.64 Societe Generale 2018.12.19 2019.01.21 7,853 USD 7,000 1,121.85 Societe Generale 2018.12.21 2019.01.28 8,974 USD 8,000 1,121.75 MUFG 2018.12.19 2019.01.21 6,730 USD 6,000 1,121.70 MUFG 2018.12.28 2019.02.07 8,929 USD 8,000 1,116.15 Nova Scotia 2018.12.19 2019.01.22 4,486 USD 4,000 1,121.50 Nova Scotia 2018.12.21 2019.01.28 8,976 USD 8,000 1,121.95 Nova Scotia 2018.12.27 2019.01.31 7,832 USD 7,000 1,118.90 Nonghyup Bank 2018.12.28 2019.02.07 10,041 USD 9,000 1,115.70 BNP Paribas 2018.12.28 2019.02.07 8,930 USD 8,000 1,116.30 CCB 2018.12.28 2019.02.07 7,812 USD 7,000 1,116.05 Credit Agricole 2018.12.28 2019.02.07 ￦ 7,812 USD 7,000 ￦ 1,115.95 KEB Hana Bank 2018.12.05 2019.01.07 16,697 USD 15,000 1,113.15 KEB Hana Bank 2018.12.07 2019.01.07 15,672 USD 14,000 1,119.43 Busan Bank 2018.12.28 2019.01.07 6,477 USD 5,800 1,116.70 Nonghyup Bank 2018.12.12 2019.01.07 3,380 USD 3,000 1,126.60 KEB Hana Bank 2018.12.13 2019.01.15 7,849 USD 7,000 1,121.25 Shinhan Bank 2018.12.20 2019.01.22 29,320 USD 26,000 1,127.68 Nonghyup Bank 2018.12.28 2019.02.15 53,666 USD 48,000 1,118.05 Credit Agricole 2018.11.02 2019.02.07 3,039 USD 2,729 1,113.60 Credit Agricole 2018.11.05 2019.02.07 5,564 USD 5,000 1,112.70 Nova Scotia 2018.11.07 2019.02.13 5,567 USD 5,000 1,113.40 Nova Scotia 2018.11.07 2019.02.13 4,458 USD 4,000 1,114.40 Societe Generale 2018.11.29 2019.03.04 5,568 USD 5,000 1,113.50 Societe Generale 2018.11.29 2019.03.04 3,674 USD 3,297 1,114.50 Credit Agricole 2018.12.03 2019.03.05 256 USD 231 1,109.10 Nova Scotia 2018.12.04 2019.03.06 5,522 USD 5,000 1,104.30 Nova Scotia 2018.12.04 2019.03.06 5,527 USD 5,000 1,105.30 Nova Scotia 2018.12.20 2019.03.26 5,589 USD 5,000 1,117.80 Nova Scotia 2018.12.20 2019.03.26 1,751 USD 1,565 1,118.80 Nova Scotia 2018.12.28 2019.04.02 5,565 USD 5,000 1,113.00 Nova Scotia 2018.12.28 2019.04.02 5,569 USD 5,000 1,113.80 Nova Scotia 2018.12.28 2019.04.02 5,576 USD 5,000 1,115.20 Nova Scotia 2018.12.28 2019.04.03 5,553 USD 5,000 1,110.60 Nova Scotia 2018.12.28 2019.04.03 5,558 USD 5,000 1,111.60 Nova Scotia 2018.12.28 2019.04.03 5,563 USD 5,000 1,112.60
Currency swap contracts which are not designated as hedge instruments	Currency swap contracts which are not designated as hedge instruments as of December 31, 2018 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 Credit Suisse 2014~2019 ￦ 118,632 CHF 100,000 2.98 % 1.50 % ￦ 1,186.32 Standard Chartered 2014~2019 114,903 CHF 100,000 4.00 % 1.50 % 1,149.03 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 KEB 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 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 KEB 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 HSBC 2014~2019 105,260 USD 100,000 2.48 % 2.38 % 1,052.60 Standard Chartered 2014~2019 ￦ 105,260 USD 100,000 2.48 % 2.38 % ￦ 1,052.60 Korea Development Bank 2016~2019 105,260 USD 100,000 2.48 % 2.38 % 1,052.60 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 KEB 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 KEB 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 115,387 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 KEB 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
Currency swap contracts which are designated as hedge instruments	Currency swap contracts which are designated as hedge instruments as of December 31, 2018 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 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 KEB 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 JP Morgan 2014~2019 107,190 USD 100,000 3M Libor+3.25% 2.75% 1,071.90 Morgan Stanley 2014~2019 107,190 USD 100,000 3M Libor+3.25% 2.75% 1,071.90 Deutsche Bank 2014~2019 107,190 USD 100,000 3M Libor+3.25% 2.75% 1,071.90 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 Credit Agricole 2013~2019 118,343 CHF 100,000 3.47% 1.63% 1,183.43 Morgan Stanley 2013~2019 59,172 CHF 50,000 3.40% 1.63% 1,183.43 Nomura 2013~2019 59,172 CHF 50,000 3.47% 1.63% 1,183.43 Standard Chartered 2014~2019 104,490 USD 100,000 2.77% 2.63% 1,044.90 Credit Agricole 2014~2019 104,490 USD 100,000 2.77% 2.63% 1,044.90 Morgan Stanley 2014~2019 104,490 USD 100,000 2.70% 2.63% 1,044.90 Korea Development Bank 2018~2023 320,880 USD 300,000 2.03% 3.75% 1,069.60 KEB 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 KEB Hana Bank 2014~2020 55,340 USD 50,000 2.16% 2.50% 1,106.80 KEB 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 KEB 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 KEB 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 hedge instruments as of December 31, 2018 are as follows: Counterparty Contract Contract amount Contract interest rate per annum Pay Receive In millions of KEB Hana Bank 2017~2022 ￦ 100,000 2.01% 3M CD+0.24% KEB Hana Bank 2017~2022 100,000 2.06% 3M CD+0.27% Nomura(*1) 2017~2037 30,000 2.05% 3.08% KEB Hana Bank 2017~2021 200,000 2.45% 3M CD+0.32% Nomura(*2) 2018~2038 30,000 2.56% 3.75% KEB Hana Bank 2018~2023 200,000 2.15% 3M CD+0.19% KEB Hana Bank 2018~2023 200,000 2.17% 3M CD+0.19% KEB Hana Bank 2018~2023 150,000 2.03% 3M CD+0.21% Societe Generale 2017~2022 200,000 3M Libor+3.44% 3.77% 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. (*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.
Interest rate swap contracts which are designated as hedge instruments	Interest rate swap contracts which are designated as hedge instruments as of December 31, 2018 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 Credit Agricole 2018~2033 USD 92,686 3.98%~4.10% 6M USD Libor SMBC 2018~2033 USD 121,205 4.05%~4.18% 6M USD Libor Mizuho Bank 2016~2019 USD 36,890 1.56% 1.65% SMBC 2016~2019 USD 36,890 1.56% 1.65% Export-import bank of Korea 2016~2036 USD 2,564 3.00% 4.99%
Gain and loss on valuation and transaction of derivatives	Gain and loss on valuation and transaction of derivatives for the years ended December 31, 2016, 2017 and 2018 are as follows and included in finance income and costs in the consolidated statements of comprehensive income (loss): Net income effects of Net income effects of Accumulated other comprehensive income (loss) (*) 2016 2017 2018 2016 2017 2018 2016 2017 2018 In millions of won Currency forward ￦ 15,993 (41,889 ) 12,632 4,266 (28,223 ) 23,991 — — — Currency swap 253,035 (843,747 ) 145,088 (68,266 ) (137,376 ) 123,670 40,031 26,810 (12,516 ) Interest rate swap 8,517 6,909 (2,949 ) 7,562 (3,362 ) (364 ) 6,719 5,074 6,087 Other derivatives 10,523 4,060 (1,568 ) — — — — — — ￦ 288,068 (874,667 ) 153,203 (56,438 ) (168,961 ) 147,297 46,750 31,884 (6,429 ) (*) For the year ended December 31, 2018, the net gain on valuation of derivatives applying cash flow hedge accounting of ￦211 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, 2018
Other Financial Assets [Abstract]
Other Financial Assets	Other financial assets as of December 31, 2017 and 2018 are as follows: 2017 2018 Current Non-current Current Non-current In millions of won Loans and receivables ￦ 244,309 711,069 123,657 639,673 Allowance for doubtful accounts — (8,948 ) (12 ) (4,940 ) Present value discount (976 ) (39,813 ) (992 ) (38,712 ) Long-term / short-term financial instruments(*1) 1,702,084 542,430 1,869,286 448,741 Financial assets at fair value through profit or loss(*1) — 111,512 — — ￦ 1,945,417 1,316,250 1,991,939 1,044,762 (*1) 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	2017 Face value Allowance for Present value Book value In millions of won Short-term loans and receivables Loans for tuition ￦ 33,763 — (976 ) 32,787 Loans for housing 14,126 — — 14,126 Fisheries loan 352 — — 352 Other loans 196,068 — — 196,068 244,309 — (976 ) 243,333 Long-term loans and receivables Loans for tuition 408,803 — (39,716 ) 369,087 Loans for housing 140,452 — — 140,452 Loans for related parties 94,581 (8,948 ) — 85,633 Fisheries loan 960 — (97 ) 863 Other loans 66,273 — — 66,273 711,069 (8,948 ) (39,813 ) 662,308 ￦ 955,378 (8,948 ) (40,789 ) 905,641 2018 Face value Allowance for Present value Book 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
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, 2016, 2017 and 2018 are as follows: 2016 2017 2018 In millions of won Beginning balance ￦ — 4,532 8,948 Bad debt expense 4,352 2,465 22 Other 180 1,951 (4,018 ) Ending balance ￦ 4,532 8,948 4,952
Long-term and short-term financial instruments	Long-term and short-term financial instruments as of December 31, 2017 and 2018 are as follows: 2017 2018 Current Non-current Current Non-current In millions of won Time deposits ￦ 1,479,034 2 1,602,285 63,358 ABCP 145,000 65,600 — — CP 58,050 — — — CD 10,000 — 10,000 — RP 10,000 1,634 — — Others — 475,194 257,001 385,383 ￦ 1,702,084 542,430 1,869,286 448,741

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2018
Inventories [Abstract]
Inventories	Inventories as of December 31, 2017 and 2018 are as follows: 2017 Acquisition cost Valuation allowance Book value In millions of won Raw materials ￦ 3,528,835 (2,829 ) 3,526,006 Merchandise 107 — 107 Work-in-progress 138,709 (1,028 ) 137,681 Finished goods 72,923 (1,517 ) 71,406 Supplies 1,581,661 (3,940 ) 1,577,721 Inventories in transit 679,358 — 679,358 Other inventories 9,807 — 9,807 ￦ 6,011,400 (9,314 ) 6,002,086 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

Finance Lease Receivables (Tabl

Finance Lease Receivables (Tables)	12 Months Ended
	Dec. 31, 2018
Finance Lease Receivables [Abstract]
Finance Lease Receivables	non-current 2017 2018 Minimum lease Present value of lease payments Minimum lease Present value In millions of won Less than 1 year ￦ 49,542 13,067 124,918 84,688 1 ~ 5 years 381,181 203,990 467,518 223,622 More than 5 years 1,398,449 645,564 1,333,016 675,036 ￦ 1,829,172 862,621 1,925,452 983,346 Allowance for doubtful accounts — (1,133 ) ￦ 862,621 982,213
Changes in the allowance for doubtful accounts of finance lease receivables	There are no impaired finance lease receivables as of December 31, 2016 and 2017, and changes in the allowance for doubtful accounts of finance lease receivables for the year ended December 31, 2018 are as follows: 2018 In millions of won Beginning balance ￦ — Bad debt expense 1,133 Write-off — Other — Ending balance ￦ 1,133

Non-Financial Assets (Tables)

Non-Financial Assets (Tables)	12 Months Ended
	Dec. 31, 2018
Non-Financial Assets [Abstract]
Non-Financial Assets	Non-financial 2017 2018 Current Non-current Current Non-current In millions of won Advance payment ￦ 109,743 43,872 156,073 160,628 Prepaid expenses 251,715 90,118 290,944 90,449 Others(*1) 392,534 112,828 431,871 76,075 ￦ 753,992 246,818 878,888 327,152 (*1) Details of others as of December 31, 2017 and 2018 are as follows: 2017 2018 Current Non-current Current Non-current In millions of won Tax refund receivables ￦ 89,762 1,940 82,348 1,276 Greenhouse gas emissions rights 135,211 — 93,749 — Other quick assets(*2) 167,561 110,888 255,774 74,799 ￦ 392,534 112,828 431,871 76,075 (*2) The Company has 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, 2018
Consolidated Subsidiaries [Abstract]
Consolidated Subsidiaries	Consolidated subsidiaries as of December 31, 2017 and 2018 are as follows: Percentage of ownership (%) Subsidiaries Key operation activities Location 2017 2018 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.(*2) Power generation KOREA 49.00 % 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 Canada Energy Ltd. Resources development CANADA 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 79.64 % 79.64 % Korea Electric Power Nigeria Ltd. Operation of utility plant NIGERIA 100.00 % 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 96.36 % 96.36 % PT KEPCO Resource Indonesia Holding company INDONESIA 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.(*4) Recycling fly ashes KOREA 86.22 % 86.22 % Commerce and Industry Energy Co., Ltd.(*5) Power generation KOREA 59.03 % 59.03 % KEPCO Singapore Holdings Pte., Ltd. Holding company SINGAPORE 100.00 % 100.00 % KOWEPO India Private Limited(*6) Holding company INDIA 100.00 % — KEPCO KPS Philippines Corp. Utility plant maintenance and others PHILIPPINES 51.00 % 51.00 % 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 % HI 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 99.75 % 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 % Cogentrix Solar Services, LLC Holding company USA 50.10 % — Solar Investments I, LLC Holding company USA 50.10 % — KEPCO Solar of Alamosa, LLC (formerly, Cogentrix of Alamosa, LLC) Power generation USA 50.10 % 50.10 % KEPCO-LG Holding company USA 70.00 % 70.00 % Mangilao Investment LLC Holding company USA 70.00 % 70.00 % KEPCO-LG Power generation USA 70.00 % 70.00 % Jeju Hanlim Offshore Wind Co., Ltd. Power generation KOREA 70.22 % 68.84 % PT. Siborpa Eco Power Construction and operation of utility plant INDONESIA 64.71 % 55.00 % BSK E-New Holding company KOREA 81.47 % 80.86 % e-New Holding company KOREA 75.92 % 75.36 % Songhyun e-New Holding company KOREA 80.45 % 79.85 % PT. Korea Energy Indonesia Utility plant maintenance and others INDONESIA — 95.00 % KOLAT SpA Utility plant maintenance and others CHILE — 100.00 % KEPCO California, LLC Holding company USA — 100.00 % KEPCO Mojave Holdings, LLC Holding company USA — 100.00 % Incheon Fuel Cell Co., Ltd. Power generation KOREA — 60.00 % KOEN Service Co., Ltd. Facility maintenance and service KOREA — 100.00 % KOMIPO Service Co., Ltd. Facility maintenance and service KOREA — 100.00 % KOWEPO Service Co., Ltd. Facility maintenance and service KOREA — 100.00 % KOSPO Service Co., Ltd. Facility maintenance and service KOREA — 100.00 % EWP Service Co., Ltd. Facility maintenance and service KOREA — 100.00 % PT. KOMIPO Energy Indonesia Utility plant maintenance and others INDONESIA — 95.00 % (*1) Considering treasury stocks, the effective percentage of ownership is 66.08%. (*2) These subsidiaries are included in the consolidated financial statements as the Company obtained the majority of the voting power through the shareholders’ agreement. (*3) As of reporting date, the annual reporting period of all subsidiaries is December 31, except for Mira Power Limited which is November 30. (*4) The effective percentage of ownership has increased to 86.22% since Long Lasting Value exercised the put option to sell its investment to KOSEP during the year ended December 31, 2017. (*5) 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. (*6) KOWEPO India Private Limited was in the process of liquidating its business as of December 31, 2018 and has been reclassified to assets held-for-sale,
Subsidiaries newly included in or excluded from consolidation	Subsidiaries newly included in or excluded from consolidation for the year ended December 31, 2018 are as follows: Subsidiaries included in consolidation during the year ended December 31, 2018. Subsidiary Reason PT. Korea Energy Indonesia Newly established KOLAT SpA Newly established KEPCO California, LLC Newly established KEPCO Mojave Holdings, LLC Newly established Incheon Fuel Cell Co., Ltd. Newly established KOEN Service Co., Ltd. Newly established KOMIPO Service Co., Ltd. Newly established KOWEPO Service Co., Ltd. Newly established KOSPO Service Co., Ltd. Newly established EWP Service Co., Ltd. Newly established PT. KOMIPO Energy Indonesia Newly established Subsidiaries excluded from consolidation during the year ended December 31, 2018. Subsidiary Reason KEPCO Canada Energy Ltd. Liquidated Cogentrix Solar Services, LLC Liquidated Solar Investments I, LLC Liquidated PT KEPCO Resource Indonesia Liquidated KOWEPO India Private Limited Liquidating
Summary of financial information of consolidated subsidiaries	Summary of financial information of consolidated subsidiaries as of and for the years ended December 31, 2017 and 2018 are as follows: 2017 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the period In millions of won Korea Hydro & Nuclear Power Co., Ltd. ￦ 55,011,096 29,252,816 9,415,751 854,346 Korea South-East Power Co., Ltd. 9,879,577 4,844,184 5,387,846 130,371 Korea Midland Power Co., Ltd. 9,893,822 6,148,173 4,167,009 104,591 Korea Western Power Co., Ltd. 9,660,426 5,739,534 4,199,079 110,939 Korea Southern Power Co., Ltd. 9,648,741 5,401,216 4,397,552 98,817 Korea East-West Power Co., Ltd. 8,855,518 4,204,187 4,644,330 217,599 KEPCO Engineering & Construction Company, Inc. 762,166 305,134 490,193 21,222 KEPCO Plant Service & Engineering Co., Ltd. 1,195,086 294,689 1,232,113 135,482 KEPCO Nuclear Fuel Co., Ltd. 792,187 421,088 279,664 4,557 KEPCO KDN Co., Ltd. 524,520 155,715 619,470 48,968 Garolim Tidal Power Plant Co., Ltd. 619 345 — (12 ) KEPCO International HongKong Ltd. 153,529 1 — 4,380 KEPCO International Philippines Inc. 102,323 886 — 47,201 KEPCO Gansu International Ltd. 11,567 493 — (29 ) KEPCO Philippines Holdings Inc. 127,922 2,621 — 43,218 KEPCO Philippines Corporation 6,293 114 — 2,098 KEPCO Ilijan Corporation 474,624 57,801 109,183 66,320 KEPCO Lebanon SARL 1,069 9,281 — (219 ) KEPCO Neimenggu International Ltd. 165,937 — — 500 KEPCO Shanxi International Ltd. 497,990 193,309 — 3,796 KOMIPO Global Pte Ltd. 225,411 1,497 — 21,858 KEPCO Canada Energy Ltd. 132 22 — (32 ) KEPCO Netherlands B.V. 114,911 49 — 17,309 KOREA Imouraren Uranium Investment Corp. 151,278 131 — 1,490 KEPCO Australia Pty., Ltd. 466,654 569 — (568 ) KOSEP Australia Pty., Ltd. 27,076 333 12,096 1,601 KOMIPO Australia Pty., Ltd. 31,441 4,691 12,096 1,133 KOWEPO Australia Pty., Ltd. 31,586 4,691 12,096 1,232 KOSPO Australia Pty., Ltd. 29,472 4,221 12,096 (2,759 ) KEPCO Middle East Holding Company 95,812 90,842 — 2,913 Qatrana Electric Power Company 460,206 327,401 18,892 23,310 KHNP Canada Energy, Ltd. 51,994 31 — (92 ) KEPCO Bylong Australia Pty., Ltd. 242,364 277,549 — 20,271 Korea Waterbury Uranium Limited Partnership 20,886 136 — (59 ) Korea Electric Power Nigeria Ltd. 238 76 2,164 29 KEPCO Holdings de Mexico 235 30 — (20 ) KST Electric Power Company 546,242 478,230 120,126 16,154 KEPCO Energy Service Company 1,793 451 6,773 976 KEPCO Netherlands S3 B.V. 46,642 53 — 2,382 PT. KOMIPO Pembangkitan Jawa Bali 11,261 4,769 20,956 4,666 PT. Cirebon Power Service 2,808 155 7,439 592 2017 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the period In millions of won KOWEPO International Corporation ￦ — 8 — (2 ) KOSPO Jordan LLC 24,077 13,594 7,331 953 EWP Philippines Corporation 1,708 836 — (17 ) EWP America Inc.(*1) 79,854 67,308 23,543 (9,737 ) KNF Canada Energy Limited 1,884 31 — (43 ) PT KEPCO Resource Indonesia 491 — — (311 ) EWP Barbados 1 SRL 235,096 450 — (2,585 ) Gyeonggi Green Energy Co., Ltd. 282,408 199,160 95,192 3,203 PT. Tanggamus Electric Power 179,317 160,144 34,281 4,640 Gyeongju Wind Power Co., Ltd. 112,279 82,124 7,219 2,400 KOMIPO America Inc. 10,505 521 — 2,071 KOSEP USA, INC. 184 9,065 — 26,997 PT. EWP Indonesia 2,035 23 — 1,916 KEPCO Netherlands J3 B.V. 122,612 76 — 12,115 Korea Offshore Wind Power Co., Ltd. 190,195 1,985 — (6,997 ) Global One Pioneer B.V. 151 38 — (80 ) Global Energy Pioneer B.V. 309 41 — (87 ) Mira Power Limited 208,150 163,198 — 737 KOSEP Material Co., Ltd. 2,751 1,448 3,128 320 Commerce and Industry Energy Co., Ltd. 99,129 87,926 30,577 (749 ) KEPCO Singapore Holdings Pte., Ltd. 3,265 4 — (24 ) KOWEPO India Private Limited 781 — — (46 ) KEPCO KPS Philippines Corp. 6,636 235 6,840 555 KOSPO Chile SpA 133,570 50,109 — 1,066 PT. KOWEPO Sumsel Operation And Maintenance Services 1,350 279 7,651 659 HeeMang Sunlight Power Co., Ltd. 6,876 3,395 105 (229 ) Fujeij Wind Power Company 165,636 156,099 — 8,836 KOSPO Youngnam Power Co.,Ltd. 412,785 333,302 68,973 939 HI Carbon Professional Private Special Asset Investment Trust 1 3,002 — — 12 Chitose Solar Power Plant LLC 136,098 121,622 7,083 4,100 KEPCO Energy Solution Co. Ltd. 313,401 12,376 5,544 1,325 Solar School Plant Co., Ltd. 201,482 599 67 874 KOSPO Power Services Limitada 3,901 887 11,067 666 Energy New Industry Specialized Investment Private Investment Trust(*3) 506,207 2,118 — 52 KOEN Bylong Pty., Ltd. 5,875 — — — KOMIPO Bylong Pty., Ltd. 5,875 — — — KOWEPO Bylong Pty., Ltd. 5,875 — — — KOSPO Bylong Pty., Ltd. 5,875 — — — EWP Bylong Pty., Ltd. 5,875 — — — KOWEPO Lao International 3,259 1,452 3,624 1,881 KEPCO US Inc. 16,913 — — — KEPCO Alamosa LLC 33,144 492 — (218 ) Cogentrix Solar Services, LLC(*2) 84,458 53,116 8,958 (112 ) 2017 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the period In millions of won KEPCO-LG ￦ 24,131 24,395 — (278 ) Mangilao Investment LLC 24,131 — — — KEPCO-LG 24,002 134 — (278 ) Jeju Hanlim Offshore Wind Co., Ltd. 36 — — — PT. Siborpa Eco Power 11,562 214 — (518 ) (*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 Cogentrix Solar Services, LLC includes that of two other subsidiaries, Solar Investments I, LLC and KEPCO Solar of Alamosa, LLC (formerly, Cogentrix of Alamosa, LLC). (*3) Financial information of Energy New Industry Specialized Investment Private Investment Trust includes that of three other subsidiaries, BSK E-New e-New e-New 2018 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the period 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 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 ) 2018 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the period In millions of won 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 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 HI Carbon Professional Private Special Asset Investment Trust 1 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 ) 2018 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the period In millions of won Mangilao Investment LLC ￦ 25,641 — — — KEPCO-LG 25,406 146 — (104 ) 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
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. 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. 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.
Details of non-controlling interest prior to intra-group eliminations	Details of non-controlling 2016 Description KEPCO Ilijan KEPCO Plant KEPCO Construction Others Total In millions of won Percentage of ownership 49.00 % 49.00 % 33.92 % Current assets ￦ 154,758 553,924 270,553 1,211,510 2,190,745 Non-current assets 403,272 532,497 516,043 2,379,882 3,831,694 Current liabilities (19,256 ) (264,506 ) (286,444 ) (297,510 ) (867,716 ) Non-current liabilities (39,193 ) (36,984 ) (78,232 ) (1,919,924 ) (2,074,333 ) Net assets 499,581 784,931 421,920 1,373,958 3,080,390 Book value of non-controlling interest 244,794 384,616 143,115 684,093 1,456,618 Sales 116,667 1,214,304 506,012 674,461 2,511,444 Profit for the period 51,552 86,657 17,796 102,170 258,175 Profit for the period attributable to non-controlling interest 25,260 42,462 6,036 26,709 100,467 Cash flows from operating activities 102,546 121,240 18,748 84,086 326,620 Cash flows from investing activities (117 ) 79,807 (7,556 ) (367,674 ) (295,540 ) Cash flows from financing activities before dividends to non-controlling interest (56,863 ) (39,911 ) (1,634 ) 877,863 779,455 Dividends to non-controlling interest (55,705 ) (36,139 ) (2,539 ) (22,054 ) (116,437 ) Effect of exchange rate fluctuation 1,529 127 (854 ) 7,216 8,018 Net increase (decrease) of cash and cash equivalents (8,610 ) 125,124 6,165 579,437 702,116 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 )
Changes in goodwill	2017 2018 In millions of won Acquisition cost ￦ 2,582 2,582 Accumulated impairment — — Carrying book value ￦ 2,582 2,582
Disposals of subsidiaries	(i) The fair value of proceeds from disposal as of December 31, 2016, 2017 and 2018, respectively, are as follows: 2016 2017 2018 In millions of won Consideration received in cash ￦ 898 — 160 Net assets transferred due to dissolution or liquidation 34,148 — — ￦ 35,046 — 160 (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, 2016, 2017 and 2018, respectively, are as follows: 2016 2017 2018 In millions of won Current assets Cash and cash equivalents ￦ 898 — 175 Current financial assets 81 — — Trade and other receivables — — 11 Non-current Available-for-sale 34,089 — — Current liabilities Current financial liabilities (22 ) — — Trade and other payables — — (28 ) ￦ 35,046 — 158 (iii) Gain from disposals of subsidiaries for the years ended December 31, 2016, 2017 and 2018, respectively, are as follows: 2016 2017 2018 In millions of won Fair value of sale price ￦ 35,046 — 160 Net assets disposed (35,046 ) — (158 ) Non-controlling — — — Realization of unrealized gain — — 70 Other comprehensive income — — — Gain from disposals of subsidiaries(*1) ￦ — — 72 (*1) Gain from disposals of subsidiaries is included in the consolidated statements of comprehensive income (loss). (iv) Net cash flow from sales of subsidiaries for the years ended December 31, 2016, 2017 and 2018, respectively, are as follows: 2016 2017 2018 In millions of won Consideration received in cash ￦ 898 — 160 Less: cash held by disposed subsidiaries (898 ) — (175 ) Net cash flow ￦ — — (15 )
Cash dividends received from subsidiaries	Subsidiaries 2016 2017 2018 In millions of won Korea Hydro & Nuclear Power Co., Ltd. ￦ 635,200 543,072 281,234 Korea South-East Power Co., Ltd. 124,169 106,546 33,928 Korea Midland Power Co., Ltd. 23,073 54,305 26,581 Korea Western Power Co., Ltd. 36,238 66,992 28,996 Korea Southern Power Co., Ltd. 17,849 60,630 25,780 Korea East-West Power Co., Ltd. 67,906 94,430 61,408 KEPCO Engineering & Construction Company, Inc. 5,069 2,765 5,531 KEPCO Plant Service & Engineering Co., Ltd. 39,911 15,607 33,739 KEPCO Nuclear Fuel Co., Ltd. 3,411 3,231 1,077 KEPCO KDN Co., Ltd. 3,392 4,352 13,888 KEPCO International HongKong Ltd. 9,107 4,304 23,314 KEPCO International Philippines Inc. 61,862 44,906 52,507 KEPCO Ilijan Corporation 57,979 50,849 53,900 KEPCO Philippines Holdings Inc. 17,747 26,023 — KEPCO Neimenggu International Ltd. 10,735 — — KOMIPO Global Pte Ltd. 10,432 — — Qatrana Electric Power Company 8,331 5,939 6,240 KOSPO Jordan LLC 1,095 — — KEPCO Energy Service Company 294 — — EWP Philippines Corporation — — — KEPCO Netherlands S3 B.V. — — 3,115 PT. KOMIPO Pembangkitan Jawa Bali 3,222 3,188 20,658 KEPCO Netherlands J3 B.V. 12,507 — 12,090 Gyeongju Wind Power Co., Ltd. 679 — — Energy New Industry Specialized Investment Private Investment Trust — 291 — HI Carbon Professional Private Special Asset Investment Trust 1 — 11 11 KOSPO Power Services Limitada — 425 993 Cogentrix Solar Services, LLC — 344 — KEPCO Netherlands B.V. — — 17,424 PT. Cirebon Power Service — — 382 Chitose Solar Power Plant LLC — — 1,986 ￦ 1,150,208 1,088,210 704,782

Investments in Associates and_2

Investments in Associates and Joint Ventures (Tables)	12 Months Ended
	Dec. 31, 2018
Investments in Associates and Joint Ventures [Abstract]
Investments in Associates and Joint Ventures	Investments in associates and joint ventures as of December 31, 2017 and 2018 are as follows: 2017 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 1,618,868 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 40,606 Cheongna Energy Co., Ltd. Generating and distributing vapor and hot/cold water KOREA 43.90 % 48,353 8,337 Gangwon Wind Power Co., Ltd.(*2) Power generation KOREA 15.00 % 5,725 13,855 Hyundai Green Power Co., Ltd. Power generation KOREA 29.00 % 88,885 114,806 Korea Power Exchange(*5) Management of power market and others KOREA 100.00 % 127,839 237,631 AMEC Partners Korea Ltd.(*3) Resources development KOREA 19.00 % 707 215 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 5,319 Taeback Guinemi Wind Power Co., Ltd. Power generation KOREA 25.00 % 3,420 3,089 Pyeongchang Wind Power Co., Ltd. Power generation KOREA 25.00 % 3,875 4,136 Daeryun Power Co., Ltd.(*3, 9) Power generation KOREA 13.13 % 25,477 25,113 Changjuk Wind Power Co., Ltd. Power generation KOREA 30.00 % 3,801 7,515 KNH Solar Co., Ltd. Power generation KOREA 27.00 % 1,296 2,218 SPC Power Corporation Power generation PHILIPPINES 38.00 % 20,635 52,283 Gemeng International Energy Co., Ltd. Power generation CHINA 34.00 % 413,153 649,973 PT. Cirebon Electric Power Power generation INDONESIA 27.50 % 40,365 97,410 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 29,403 PT. Bayan Resources TBK Resources development INDONESIA 20.00 % 615,860 451,831 S-Power Power generation KOREA 49.00 % 132,300 116,945 Pioneer Gas Power Limited(*7) Power generation INDIA 38.50 % 49,831 38,659 Eurasia Energy Holdings Power generation and resources development RUSSIA 40.00 % 461 — Xe-Pian Xe-Namnoy Power generation LAOS 25.00 % 71,481 61,779 Hadong Mineral Fiber Co., Ltd.(*3) Recycling fly ashes KOREA 8.33 % 50 — Green Biomass Co., Ltd.(*11, 14) Power generation KOREA 8.80 % 714 208 PT. Mutiara Jawa Manufacturing and operating floating coal terminal INDONESIA 29.00 % 2,978 — Samcheok Eco Materials Co., Ltd.(*10) Recycling fly ashes KOREA 2.35 % 686 — Noeul Green Energy Co., Ltd. Power generation KOREA 29.00 % 1,740 2,067 Naepo Green Energy Co., Ltd. Power generation KOREA 41.67 % 29,200 20,598 Goseong Green Energy Co., Ltd.(*2) Power generation KOREA 1.12 % 2,900 2,597 Gangneung Eco Power Co., Ltd.(*2) Power generation KOREA 1.61 % 2,900 2,583 Shin Pyeongtaek Power Co., Ltd. Power generation KOREA 40.00 % 43,920 34,903 Heang Bok Do Si Photovoltaic Power Co., Ltd. Power generation KOREA 28.00 % 194 187 Dongducheon Dream Power Co., Ltd. Power generation KOREA 33.61 % 111,134 53,233 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 3,476 Daegu Photovoltaic Co., Ltd. Power generation KOREA 29.00 % 1,230 1,718 Jeongam Wind Power Co., Ltd. Power generation KOREA 40.00 % 5,580 3,763 Korea Power Engineering Service Co., Ltd. Construction and service KOREA 29.00 % 290 3,659 Busan Green Energy Co., Ltd. Power generation KOREA 29.00 % 5,243 7,363 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 % 2,604 1,749 Ulleungdo Natural Energy Co., Ltd. Renewable power generation KOREA 29.85 % 8,000 6,370 Korea Nuclear Partners Co., Ltd. Electric material agency KOREA 29.00 % ￦ 290 383 Tamra Offshore Wind Power Co., Ltd. Power generation KOREA 27.00 % 8,910 8,560 Korea Electric Power Corporation Fund(*12) Developing electric enterprises KOREA 98.09 % 51,500 47,974 Energy Infra Asset Management Co., Ltd.(*3) Asset management KOREA 9.90 % 297 476 Daegu clean Energy Co., Ltd. Renewable power generation KOREA 28.00 % 140 11 YaksuESS Co., Ltd Installing ESS related equipment KOREA 29.00 % 210 194 Nepal Water & Energy Development Company Private Limited(*15) Construction and operation of utility plant NEPAL 62.13 % 33,577 30,498 Gwangyang Green Energy Co., Ltd. Power generation KOREA 20.00 % 2,000 1,772 PND solar., Ltd Power generation KOREA 29.00 % 1,250 1,250 2,240,761 3,837,421 <Joint ventures> KEPCO-Uhde Inc.(*6) Power generation KOREA 52.80 % 11,355 258 Eco Biomass Energy Sdn. Bhd.(*6) Power generation MALAYSIA 61.53 % 14,439 — Datang Chaoyang Renewable Power Co., Ltd. Power generation CHINA 40.00 % 27,660 27,262 Shuweihat Asia Power Investment B.V. Holding company NETHERLANDS 49.00 % 46,037 15,675 Shuweihat Asia Operation & Maintenance Company(*6) Maintenance of utility plant CAYMAN 55.00 % 30 663 Waterbury Lake Uranium L.P. Resources development CANADA 35.76 % 26,602 19,781 ASM-BG Power generation BULGARIA 50.00 % 16,101 21,202 RES Technology AD Power generation BULGARIA 50.00 % 15,595 14,375 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 % 94,579 217,094 Gansu Datang Yumen Wind Power Co., Ltd. Power generation CHINA 40.00 % 16,621 10,840 Datang Chifeng Renewable Power Co., Ltd. Power generation CHINA 40.00 % 121,928 171,055 Datang KEPCO Chaoyang Renewable Power Co., Ltd. Power generation CHINA 40.00 % 10,858 11,060 Rabigh Electricity Company Power generation SAUDI ARABIA 40.00 % 109,743 99,356 Rabigh Operation & Maintenance Company Limited Maintenance of utility plant SAUDI ARABIA 40.00 % 70 3,987 Jamaica Public Service Company Limited Power generation JAMAICA 40.00 % 301,910 221,153 KW Nuclear Components Co., Ltd. Manufacturing KOREA 45.00 % 833 6,703 Busan Shinho Solar Power Co., Ltd. Power generation KOREA 25.00 % 2,100 4,346 GS Donghae Electric Power Co., Ltd. Power generation KOREA 34.00 % 204,000 220,727 Global Trade Of Power System Co., Ltd. Exporting products and technology of small or medium business by proxy KOREA 29.00 % 290 577 Expressway Solar-light Power Generation Co., Ltd. Power generation KOREA 29.00 % 1,856 2,463 KODE NOVUS I LLC Power generation USA 50.00 % 19,213 — KODE NOVUS II LLC Power generation USA 50.00 % 12,756 — Daejung Offshore Wind Power Co., Ltd. Power generation KOREA 49.90 % 5,190 2,969 Amman Asia Electric Power Company(*6) Power generation JORDAN 60.00 % 111,476 145,676 KAPES, Inc.(*6) R&D KOREA 51.00 % 5,629 7,476 Dangjin Eco Power Co., Ltd. Power generation KOREA 34.00 % 61,540 57,928 Honam Wind Power Co., Ltd. Power generation KOREA 29.00 % 3,480 4,302 Chun-cheon Energy Co., Ltd. Power generation KOREA 29.90 % 52,700 48,118 Yeonggwangbaeksu Wind Power Co., Ltd.(*3) Power generation KOREA 15.00 % 3,000 2,734 Nghi Son 2 Power LLC Power generation VIETNAM 50.00 % 2,781 183 Kelar S.A(*6) Power generation CHILE 65.00 % 77,220 67,233 PT. Tanjung Power Indonesia Power generation INDONESIA 35.00 % 746 1,776 Incheon New Power Co., Ltd. Power generation KOREA 29.00 % 461 619 Seokmun Energy Co., Ltd. Power generation KOREA 29.00 % ￦ 15,370 13,786 Daehan Wind Power PSC Power generation JORDAN 50.00 % 285 — Barakah One Company(*13) Power generation UAE 18.00 % 118 626 Nawah Energy Company(*13) Operation of utility plant UAE 18.00 % 296 258 MOMENTUM International thermonuclear experimental reactor construction management FRANCE 33.33 % 1 391 Daegu Green Power Co., Ltd. Power generation KOREA 29.00 % 46,225 42,391 Yeonggwang Wind Power Co., Ltd. Power generation KOREA 41.00 % 15,375 15,294 Chester Solar IV SpA(*6) Power generation CHILE 81.82 % 1,700 1,700 Chester Solar V SpA(*6) Power generation CHILE 81.82 % 525 525 Diego de Almagro Solar SpA(*6) Power generation CHILE 81.82 % 2,091 2,091 South Jamaica Power Company Limited Power generation JAMAICA 20.00 % 7,090 6,704 1,469,978 1,493,275 3,710,739 5,330,696 (*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 100%. However, according to the shareholders’ agreement, all critical financial and operating decisions must be agreed to by all ownership parties. For these reasons, 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, 2017, 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 effective percentage of ownership is 19.45% considering stock purchase options. (*10) The Company’s effective percentage of ownership excluding the redeemable convertible preferred stock is 25.54%. (*11) 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. (*12) 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. (*13) 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 (*14) The percentage of ownership decreased since the Company did not participate in the capital increase of Green Biomass Co., Ltd. during the period. (*15) 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. 2018 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 1,701,848 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.
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, 2017 and 2018 are as follows: Investees 2017 2018 In millions of won <Associates> Korea Electric Power Industrial Development Co., Ltd. ￦ 38,667 33,609 Korea Gas Corporation(*) 804,195 910,980 YTN Co., Ltd. 18,855 18,900 SPC Power Corporation 72,616 72,710 PT. Bayan Resources TBK 558,267 1,017,601 (*) The carrying amount of Korea Gas Corporation (“KOGAS”) is ￦1,701,848 million as of December 31, 2018 and management has determined that there is objective evidence of impairment. As a result of the impairment test, the Company has not recognized any impairment loss as the value in use is greater than the carrying amount. The recoverable amount of KOGAS based on its value in use is calculated by considering the long-term natural gas supply and demand programs of future cash flows approved by Ministry of Trade, Industry & Energy and the discount rate of 4.80%.
Changes in investments in associates and joint ventures	Changes in investments in associates and joint ventures for the years ended December 31, 2017 and 2018 are as follows: 2017 Investees Beginning Acquisition Disposal Dividends Share of Other (loss) Others Ending In millions of won <Associates> Korea Gas Corporation ￦ 1,933,877 — — — (242,232 ) (72,648 ) (129 ) 1,618,868 Korea Electric Power Industrial Development Co., Ltd. 20,475 — — (2,061 ) 3,428 102 (106 ) 21,838 YTN Co., Ltd. 38,156 — — (135 ) 1,095 929 561 40,606 Cheongna Energy Co., Ltd. 12,373 — — — (4,036 ) — — 8,337 Gangwon Wind Power Co., Ltd. 13,069 — — (852 ) 1,638 — — 13,855 Hyundai Green Power Co., Ltd. 115,998 — — (8,889 ) 7,697 — — 114,806 Korea Power Exchange 223,238 — — — 8,831 — 5,562 237,631 AMEC Partners Korea Ltd. 225 — — — (10 ) — — 215 Hyundai Energy Co., Ltd. 1,031 — — — (3,498 ) — 2,467 — Ecollite Co., Ltd. — — — — — — — — Taebaek Wind Power Co., Ltd. 4,750 — — — 569 — — 5,319 Taeback Guinemi Wind Power Co., Ltd. 3,131 — — — (42 ) — — 3,089 Pyeongchang Wind Power Co., Ltd. 3,383 — — — 753 — — 4,136 Daeryun Power Co., Ltd. 29,873 — — — (4,762 ) — 2 25,113 Changjuk Wind Power Co., Ltd. 6,930 — — (111 ) 696 — — 7,515 KNH Solar Co., Ltd. 2,073 — — — 145 — — 2,218 SPC Power Corporation 56,818 — — (5,562 ) 4,310 (3,276 ) (7 ) 52,283 Gemeng International Energy Co., Ltd. 680,065 — — (13,365 ) 6,953 (23,680 ) — 649,973 PT. Cirebon Electric Power 96,658 — — (550 ) 10,685 2,232 (11,615 ) 97,410 KNOC Nigerian East Oil Co., Ltd. — — — — (1,914 ) 1,536 378 — KNOC Nigerian West Oil Co., Ltd. — — — — (1,712 ) 1,407 305 — PT Wampu Electric Power 23,188 — — — 9,336 — (3,121 ) 29,403 PT. Bayan Resources TBK 402,667 — — — 34,122 14,982 60 451,831 S-Power 123,912 — — — (6,982 ) — 15 116,945 Pioneer Gas Power Limited 50,740 — — — (11,119 ) (1,238 ) 276 38,659 Eurasia Energy Holdings — — — — — — — — Xe-Pian Xe-Namnoy 51,544 22,362 — — (4,264 ) (7,863 ) — 61,779 Hadong Mineral Fiber Co., Ltd. — — — — (31 ) — 31 — Green Biomass Co., Ltd. 47 — — — (112 ) — 273 208 PT. Mutiara Jawa — — — — — — — — Samcheok Eco Materials Co., Ltd. — — — — — — — — Noeul Green Energy Co., Ltd. 1,217 — — — 850 — — 2,067 Naepo Green Energy Co., Ltd.(*2) 25,438 — — — (1,400 ) — (3,440 ) 20,598 Goseong Green Energy Co., Ltd. 2,663 — — — (66 ) — — 2,597 Gangneung Eco Power Co., Ltd. 2,646 — — — (63 ) — — 2,583 Shin Pyeongtaek Power Co., Ltd. — 43,880 — — (10,998 ) (3,617 ) 5,638 34,903 Heang Bok Do Si Photovoltaic Power Co., Ltd. 181 — — — 6 — — 187 DS POWER Co., Ltd.(*4) 7,190 — — — (1,321 ) — (5,869 ) — Dongducheon Dream Power Co., Ltd.(*1,3) 46,876 — — — (10,980 ) — 17,337 53,233 KS Solar Co., Ltd. 604 — (613 ) — — 9 — — Jinbhuvish Power Generation Pvt. Ltd. — — — — — — — — SE Green Energy Co., Ltd. 3,525 — — — (49 ) — — 3,476 Daegu Photovoltaic Co., Ltd. 1,700 — — (349 ) 367 — — 1,718 Jeongam Wind Power Co., Ltd. 4,000 — — — (237 ) — — 3,763 Korea Power Engineering Service Co., Ltd. 2,810 — — (191 ) 1,030 — 10 3,659 Busan Green Energy Co., Ltd. ￦ 13,803 — (9,320 ) — 2,884 — (4 ) 7,363 Gunsan Bio Energy Co., Ltd. — — — — — — — — Korea Electric Vehicle Charging Service 1,103 1,008 — — (362 ) — — 1,749 Ulleungdo Natural Energy Co., Ltd. 6,894 — — — (524 ) — — 6,370 Korea Nuclear Partners Co., Ltd. 248 — — — 135 — — 383 Tamra Offshore Wind Power 7,015 — — — 1,545 — — 8,560 Korea Electric Power Corporation Fund 50,856 — — — (2,171 ) (711 ) — 47,974 Energy Infra Asset Management 259 — — — 217 — — 476 Daegu clean Energy Co., Ltd. 140 — — — (129 ) — — 11 YaksuESS Co., Ltd 196 — — — (2 ) — — 194 Nepal Water & Energy Development Company Private Limited 18,667 15,009 — — (677 ) (2,501 ) — 30,498 Gwangyang Green Energy Co., Ltd. — 2,000 — — (228 ) — — 1,772 PND solar., Ltd — 1,250 — — — — — 1,250 4,092,252 85,509 (9,933 ) (32,065 ) (212,629 ) (94,337 ) 8,624 3,837,421 <Joint ventures> KEPCO-Uhde Inc. 301 — — — (43 ) — — 258 Eco Biomass Energy Sdn. Bhd. — — — — — — — — Datang Chaoyang Renewable Power 28,239 — — (839 ) 840 (978 ) — 27,262 Shuweihat Asia Power Investment B.V. — — — (1,707 ) 4,275 12,457 650 15,675 Shuweihat Asia Operation & Maintenance Company 450 — — (770 ) 1,055 (172 ) 100 663 Waterbury Lake Uranium L.P. 21,314 — — — (23 ) (949 ) (561 ) 19,781 ASM-BG 21,488 — — (946 ) (150 ) 810 — 21,202 RES Technology AD 13,582 — — — 1,053 (260 ) — 14,375 KV Holdings, Inc. 2,098 — — — 61 (241 ) — 1,918 KEPCO SPC Power Corporation 245,367 — — (37,443 ) 42,359 (33,230 ) 41 217,094 Canada Korea Uranium Limited partnership — — — — — — — — Gansu Datang Yumen Wind Power 12,821 — — — (1,299 ) (682 ) — 10,840 Datang Chifeng Renewable Power 166,535 — — — 14,079 (9,559 ) — 171,055 Datang KEPCO Chaoyang Renewable Power Co., Ltd. 10,843 — — — 837 (620 ) — 11,060 Rabigh Electricity Company 97,802 — — (18,112 ) 35,769 (15,227 ) (876 ) 99,356 Rabigh Operation & Maintenance Company Limited 4,427 — — (2,130 ) 2,236 (546 ) — 3,987 Jamaica Public Service Company Limited 249,453 — — — — (28,300 ) — 221,153 KW Nuclear Components Co., Ltd. 7,133 — — (208 ) (222 ) — — 6,703 Busan Shinho Solar Power Co., Ltd. 3,814 — — (63 ) 595 — — 4,346 GS Donghae Electric Power Co., Ltd. 205,948 — — — 14,714 — 65 220,727 Global Trade Of Power System 477 — — — 100 — — 577 Expressway Solar-light Power Generation Co., Ltd. 2,343 — — — 120 — — 2,463 KODE NOVUS I LLC ￦ — — — — — — — — KODE NOVUS II LLC — — — — — — — — Daejung Offshore Wind Power 3,015 200 — — (246 ) — — 2,969 Amman Asia Electric Power Company 153,857 — — (12,213 ) 19,957 (15,925 ) — 145,676 KAPES, Inc. 4,758 — — — 2,752 — (34 ) 7,476 Dangjin Eco Power Co., Ltd. 53,253 5,440 — — (752 ) (3 ) (10 ) 57,928 Honam Wind Power Co., Ltd. 4,451 — — (487 ) 338 — — 4,302 Chun-cheon Energy Co., Ltd. 50,592 — — — (2,474 ) — — 48,118 Yeonggwangbaeksu Wind Power Co., Ltd. 2,689 — — — 45 — — 2,734 Nghi Son 2 Power LLC 229 993 — — (1,039 ) — — 183 Kelar S.A — 73,040 — — (633 ) (5,175 ) 1 67,233 PT. Tanjung Power Indonesia 1,946 — — — 2,112 (2,281 ) (1 ) 1,776 Incheon New Power Co., Ltd. 563 — — — 56 — — 619 Seokmun Energy Co., Ltd. 391 14,790 — — (1,219 ) (176 ) — 13,786 Daehan Wind Power PSC 16 — — — (40 ) 22 2 — Barakah One Company 116 — — — 570 (60 ) — 626 Nawah Energy Company 290 — — — (5 ) (27 ) — 258 MOMENTUM 67 — — — 321 3 — 391 Daegu Green Power Co., Ltd. 47,528 — — — (5,133 ) — (4 ) 42,391 Yeonggwang Wind Power Co., Ltd. — 15,375 — — (25 ) (56 ) — 15,294 Chester Solar IV SpA — 1,700 — — — — — 1,700 Chester Solar V SpA — 525 — — — — — 525 Diego de Almagro Solar SpA — 2,091 — — — — — 2,091 South Jamaica Power Company Limited — 7,090 — — — — (386 ) 6,704 1,418,196 121,244 — (74,918 ) 130,941 (101,175 ) (1,013 ) 1,493,275 ￦ 5,510,448 206,753 (9,933 ) (106,983 ) (81,688 ) (195,512 ) 7,611 5,330,696 (*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 ￦23,798 million in impairment loss on investments in associates and joint ventures for the year ended December 31, 2017. (*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 ￦3,440 million in impairment loss on investments in associates and joint ventures for the year ended December 31, 2017. (*3) ‘Others’ include ￦41,170 million of assets held-for-sale (*4) ‘Others’ include ￦4,438 million of assets held-for-sale available-for-sale 2018 Investees Beginning balance Acquisition Disposal Dividends received Share of income (loss) Other comprehensive income (loss) Others Ending balance 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.
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, 2017 and 2018 are as follows: 2017 Investees Total assets Total liabilities Sales Profit (loss) for the period In millions of won <Associates> Korea Gas Corporation ￦ 37,139,439 28,999,025 22,172,305 (1,205,110 ) Korea Electric Power Industrial Development Co., Ltd. 155,033 79,730 334,547 16,126 YTN Co., Ltd. 298,122 108,554 131,080 3,638 Cheongna Energy Co., Ltd. 461,958 448,535 56,533 (9,203 ) Gangwon Wind Power Co., Ltd. 94,281 2,243 25,963 11,121 Hyundai Green Power Co., Ltd. 1,150,729 754,846 477,373 26,543 Korea Power Exchange 263,499 25,868 105,107 8,831 AMEC Partners Korea Ltd. 1,135 4 1 (53 ) Hyundai Energy Co., Ltd. 474,939 511,486 92,992 (43,317 ) Ecollite Co., Ltd. 2,052 352 — (121 ) Taebaek Wind Power Co., Ltd. 39,227 17,953 7,056 2,312 Taeback Guinemi Wind Power Co., Ltd. 12,369 12 — (140 ) Pyeongchang Wind Power Co., Ltd. 77,152 60,606 11,907 3,038 Daeryun Power Co., Ltd. 779,258 655,377 156,508 (23,978 ) Changjuk Wind Power Co., Ltd. 35,794 10,745 6,981 2,317 KNH Solar Co., Ltd. 24,432 16,215 3,947 628 SPC Power Corporation 137,586 — 68,149 37,395 Gemeng International Energy Co., Ltd. 6,496,294 4,584,608 1,334,833 21,769 PT. Cirebon Electric Power 903,429 549,212 280,452 38,448 KNOC Nigerian East Oil Co., Ltd. 241,808 329,639 — (10,754 ) KNOC Nigerian West Oil Co., Ltd. 147,185 227,588 — (9,768 ) PT Wampu Electric Power 212,095 148,177 779 8,114 PT. Bayan Resources TBK 908,106 556,881 811,515 243,621 S-Power 859,633 617,224 489,042 (14,470 ) Pioneer Gas Power Limited 339,271 296,898 8,215 (27,796 ) Eurasia Energy Holdings 548 978 — — Xe-Pian Xe-Namnoy 858,789 607,462 — (16,677 ) Hadong Mineral Fiber Co., Ltd. 203 231 — (260 ) Green Biomass Co., Ltd. 6,379 4,018 2,337 (956 ) PT. Mutiara Jawa 27,098 29,670 13,574 3,455 Samcheok Eco Materials Co., Ltd. 23,729 270 15 (541 ) Noeul Green Energy Co., Ltd. 127,980 120,852 43,099 2,932 Naepo Green Energy Co., Ltd. 121,375 71,945 5,696 (5,603 ) Goseong Green Energy Co., Ltd. 1,081,238 841,330 — (5,811 ) Gangneung Eco Power Co., Ltd. 186,765 20,344 — (3,407 ) Shin Pyeongtaek Power Co., Ltd. 175,870 90,662 — (4,585 ) Heang Bok Do Si Photovoltaic Power Co., Ltd. 2,782 2,120 451 22 Dongducheon Dream Power Co., Ltd. 1,575,175 1,365,845 813,440 (33,740 ) Jinbhuvish Power Generation Pvt. Ltd. 66,047 13,640 — — SE Green Energy Co., Ltd. 7,278 — — (103 ) Daegu Photovoltaic Co., Ltd. 17,262 11,339 3,714 1,263 Jeongam Wind Power Co., Ltd. 67,427 58,019 — (580 ) Korea Power Engineering Service Co., Ltd. 15,738 3,121 22,283 3,783 Busan Green Energy Co., Ltd. ￦ 193,253 167,864 34,280 9,946 Gunsan Bio Energy Co., Ltd. 9,648 16,462 — (6,109 ) Korea Electric Vehicle Charging Service 14,650 8,404 8,399 (1,295 ) Ulleungdo Natural Energy Co., Ltd. 25,842 4,501 — (1,758 ) Korea Nuclear Partners Co., Ltd. 2,033 711 1,345 465 Tamra Offshore Wind Power Co., Ltd. 163,740 132,036 4,392 (191 ) Korea Electric Power Corporation Fund 49,170 265 666 (2,213 ) Energy Infra Asset Management Co., Ltd. 5,240 431 5,807 2,203 Daegu clean Energy Co., Ltd. 252 212 — (460 ) YaksuESS Co., Ltd 7,105 6,437 381 (6 ) Nepal Water & Energy Development Company Private Limited 58,121 11,670 — (968 ) Gwangyang Green Energy Co., Ltd. 20,165 11,393 — (1,139 ) PND solar., Ltd 10,508 6,729 — (406 ) <Joint ventures> KEPCO-Uhde Inc. 515 7 — (86 ) Eco Biomass Energy Sdn. Bhd. — — — — Datang Chaoyang Renewable Power Co., Ltd. 138,463 70,309 17,776 2,149 Shuweihat Asia Power Investment B.V. 32,001 10 — (170 ) Shuweihat Asia Operation & Maintenance Company 1,220 14 2,580 1,918 Waterbury Lake Uranium L.P. 55,563 250 — — ASM-BG 87,110 44,706 12,611 (262 ) RES Technology AD 71,595 42,845 7,793 2,164 KV Holdings, Inc. 4,795 — 671 677 KEPCO SPC Power Corporation 318,911 30,222 186,725 57,364 Gansu Datang Yumen Wind Power Co., Ltd. 81,960 54,859 6,938 (3,253 ) Datang Chifeng Renewable Power Co., Ltd. 762,605 334,843 113,329 35,294 Datang KEPCO Chaoyang Renewable Power Co., Ltd. 60,913 33,264 8,442 2,094 Rabigh Electricity Company 2,364,522 1,936,403 287,105 78,948 Rabigh Operation & Maintenance Company Limited 19,992 10,025 22,668 5,668 Jamaica Public Service Company Limited 1,276,279 752,617 946,365 24,601 KW Nuclear Components Co., Ltd. 25,693 10,221 6,486 1,493 Busan Shinho Solar Power Co., Ltd. 47,959 30,573 7,984 2,383 GS Donghae Electric Power Co., Ltd. 2,179,465 1,530,266 351,814 43,180 Global Trade Of Power System Co., Ltd. 3,576 1,586 4,079 365 Expressway Solar-light Power Generation Co., Ltd. 19,143 10,651 3,018 643 KODE NOVUS I LLC 755 108,132 14 (8,117 ) KODE NOVUS II LLC 292 47,683 — (6,018 ) Daejung Offshore Wind Power Co., Ltd. 6,193 243 — (493 ) Amman Asia Electric Power Company 759,114 516,174 18,034 33,514 KAPES, Inc. 70,679 56,021 129,962 5,397 Dangjin Eco Power Co., Ltd. 163,197 521 — (2,182 ) Honam Wind Power Co., Ltd. 39,675 24,951 5,961 1,166 Chun-cheon Energy Co., Ltd. 699,652 538,733 164,294 (8,145 ) Yeonggwangbaeksu Wind Power Co., Ltd. ￦ 94,810 76,621 11,124 297 Nghi Son 2 Power LLC 741 376 — (2,068 ) Kelar S.A 613,293 513,101 90,435 17,590 PT. Tanjung Power Indonesia 374,702 369,627 209,923 6,219 Incheon New Power Co., Ltd. 7,194 5,059 2,972 184 Seokmun Energy Co., Ltd. 247,735 200,197 35,135 (3,939 ) Daehan Wind Power PSC 928 1,752 — (904 ) Barakah One Company 17,574,885 17,571,409 — (1,358 ) Nawah Energy Company 1,459 23 — (11 ) MOMENTUM 5,028 3,854 11,555 939 Daegu Green Power Co., Ltd. 602,809 531,103 256,359 (17,700 ) Yeonggwang Wind Power Co., Ltd. 212,802 176,062 — (62 ) Chester Solar IV SpA 11,660 9,626 331 151 Chester Solar V SpA 2,081 1,569 — (49 ) Diego de Almagro Solar SpA 8,266 5,830 — (103 ) South Jamaica Power Company Limited 153,958 120,436 — (755 ) 2018 Investees Total assets Total liabilities Sales Profit (loss) for the period 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 for the year ended December 31, 2018 is net of 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, 2017 and 2018 are as follows: 2017 Investees Net Percentage of ownership(*) Share in net Investment differential Intercompany transaction Others Book value In millions of won <Associates> Korea Gas Corporation ￦ 8,140,414 21.57 % 1,755,887 — — (137,019 ) 1,618,868 Korea Electric Power Industrial Development Co., Ltd. 75,303 29.00 % 21,838 — — — 21,838 YTN Co., Ltd. 189,568 21.43 % 40,624 — (18 ) — 40,606 Cheongna Energy Co., Ltd. 13,423 43.90 % 5,893 2,584 (140 ) — 8,337 Gangwon Wind Power Co., Ltd. 92,038 15.00 % 13,806 — — 49 13,855 Hyundai Green Power Co., Ltd. 395,883 29.00 % 114,806 — — — 114,806 Korea Power Exchange 237,631 100.00 % 237,631 — — — 237,631 AMEC Partners Korea Ltd. 1,131 19.00 % 215 — — — 215 Hyundai Energy Co., Ltd. (36,547 ) 46.30 % (16,921 ) — (1,037 ) 17,958 — Ecollite Co., Ltd. 1,700 36.10 % 614 — — (614 ) — Taebaek Wind Power Co., Ltd. 21,274 25.00 % 5,319 — — — 5,319 Taeback Guinemi Wind Power Co., Ltd. 12,357 25.00 % 3,089 — — — 3,089 Pyeongchang Wind Power Co., Ltd. 16,546 25.00 % 4,136 — — — 4,136 Daeryun Power Co., Ltd. 123,881 19.45 % 24,095 1,014 — 4 25,113 Changjuk Wind Power Co., Ltd. 25,049 30.00 % 7,515 — — — 7,515 KNH Solar Co., Ltd. 8,217 27.00 % 2,218 — — — 2,218 SPC Power Corporation 137,586 38.00 % 52,283 — — — 52,283 Gemeng International Energy Co., Ltd. 1,911,686 34.00 % 649,973 — — — 649,973 PT. Cirebon Electric Power 354,217 27.50 % 97,410 — — — 97,410 KNOC Nigerian East Oil Co., Ltd. (87,831 ) 14.63 % (12,850 ) — — 12,850 — KNOC Nigerian West Oil Co., Ltd. (80,403 ) 14.63 % (11,763 ) — — 11,763 — PT Wampu Electric Power 63,918 46.00 % 29,403 — — — 29,403 PT. Bayan Resources TBK 351,225 20.00 % 70,245 482,109 — (100,523 ) 451,831 S-Power 242,409 49.00 % 118,780 — (1,835 ) — 116,945 Pioneer Gas Power Limited 42,373 38.50 % 16,314 22,278 — 67 38,659 Eurasia Energy Holdings (430 ) 40.00 % (172 ) — — 172 — Xe-Pian Xe-Namnoy 251,327 25.00 % 62,832 74 (838 ) (289 ) 61,779 Hadong Mineral Fiber Co., Ltd. (28 ) 8.33 % (2 ) — — 2 — Green Biomass Co., Ltd. 2,361 8.80 % 208 — — — 208 PT. Mutiara Jawa (2,572 ) 29.00 % (746 ) — — 746 — Samcheok Eco Materials Co., Ltd. 23,459 2.35 % 551 — — (551 ) — Noeul Green Energy Co., Ltd. 7,128 29.00 % 2,067 — — — 2,067 Naepo Green Energy Co., Ltd. 49,430 41.67 % 20,598 — — — 20,598 Goseong Green Energy Co., Ltd. 239,908 1.12 % 2,676 — (79 ) — 2,597 Gangneung Eco Power Co., Ltd. 166,421 1.61 % 2,681 — (98 ) — 2,583 Shin Pyeongtaek Power Co., Ltd. 85,208 40.00 % 34,083 7,808 (6,988 ) — 34,903 Heang Bok Do Si Photovoltaic Power Co., Ltd. 662 28.00 % 185 — — 2 187 Dongducheon Dream Power Co., Ltd. 209,330 33.61 % 70,356 — (4,409 ) (12,714 ) 53,233 Jinbhuvish Power Generation Pvt. Ltd. 52,407 5.16 % 2,704 — — (2,704 ) — SE Green Energy Co., Ltd. 7,278 47.76 % 3,476 — — — 3,476 Daegu Photovoltaic Co., Ltd. 5,923 29.00 % 1,718 — — — 1,718 Jeongam Wind Power Co., Ltd. 9,408 40.00 % 3,763 — — — 3,763 Korea Power Engineering Service Co., Ltd. 12,617 29.00 % 3,659 — — — 3,659 Busan Green Energy Co., Ltd. 25,389 29.00 % 7,363 — — — 7,363 Gunsan Bio Energy Co., Ltd. (6,814 ) 18.87 % (1,286 ) — — 1,286 — Korea Electric Vehicle Charging Service 6,246 28.00 % 1,749 — — — 1,749 Ulleungdo Natural Energy Co., Ltd. 21,341 29.85 % 6,370 — — — 6,370 Korea Nuclear Partners Co., Ltd. 1,322 29.00 % 383 — — — 383 Tamra Offshore Wind Power Co., Ltd. 31,704 27.00 % 8,560 — — — 8,560 Korea Electric Power Corporation Fund 48,905 98.09 % 47,971 — — 3 47,974 Energy Infra Asset Management Co., Ltd. 4,809 9.90 % 476 — — — 476 Daegu clean Energy Co., Ltd. 40 28.00 % 11 — — — 11 YaksuESS Co., Ltd 668 29.00 % 193 — — 1 194 Nepal Water & Energy Development Company Private Limited 46,451 62.13 % 28,860 972 — 666 30,498 Gwangyang Green Energy Co., Ltd. ￦ 8,772 20.00 % 1,754 18 — — 1,772 PND solar., Ltd 3,779 29.00 % 1,096 154 — — 1,250 <Joint ventures> KEPCO-Uhde Inc. 508 50.85 % 258 — — — 258 Eco Biomass Energy Sdn. Bhd. — 61.53 % — — — — — Datang Chaoyang Renewable Power Co., Ltd. 68,154 40.00 % 27,262 — — — 27,262 Shuweihat Asia Power Investment B.V. 31,991 49.00 % 15,675 — — — 15,675 Shuweihat Asia Operation & Maintenance Company 1,206 55.00 % 663 — — — 663 Waterbury Lake Uranium L.P. 55,313 35.76 % 19,780 — — 1 19,781 ASM-BG 42,404 50.00 % 21,202 — — — 21,202 RES Technology AD 28,750 50.00 % 14,375 — — — 14,375 KV Holdings, Inc. 4,795 40.00 % 1,918 — — — 1,918 KEPCO SPC Power Corporation 288,689 75.20 % 217,094 — — — 217,094 Gansu Datang Yumen Wind Power Co., Ltd. 27,101 40.00 % 10,840 — — — 10,840 Datang Chifeng Renewable Power Co., Ltd. 427,762 40.00 % 171,105 — — (50 ) 171,055 Datang KEPCO Chaoyang Renewable Power Co., Ltd. 27,649 40.00 % 11,060 — — — 11,060 Rabigh Electricity Company 428,119 40.00 % 171,248 — (70,978 ) (914 ) 99,356 Rabigh Operation & Maintenance Company Limited 9,967 40.00 % 3,987 — — — 3,987 Jamaica Public Service Company Limited 523,662 40.00 % 209,464 (80,161 ) — 91,850 221,153 KW Nuclear Components Co., Ltd. 15,472 45.00 % 6,962 — — (259 ) 6,703 Busan Shinho Solar Power Co., Ltd. 17,386 25.00 % 4,346 — — — 4,346 GS Donghae Electric Power Co., Ltd. 649,199 34.00 % 220,727 — — — 220,727 Global Trade Of Power System Co., Ltd. 1,990 29.00 % 577 — — — 577 Expressway Solar-light Power Generation Co., Ltd. 8,492 29.00 % 2,463 — — — 2,463 KODE NOVUS I LLC (107,377 ) 50.00 % (53,689 ) — — 53,689 — KODE NOVUS II LLC (47,391 ) 50.00 % (23,696 ) — — 23,696 — Daejung Offshore Wind Power Co., Ltd. 5,950 49.90 % 2,969 — — — 2,969 Amman Asia Electric Power Company 242,940 60.00 % 145,764 — — (88 ) 145,676 KAPES, Inc. 14,658 51.00 % 7,476 — — — 7,476 Dangjin Eco Power Co., Ltd. 162,676 34.00 % 55,310 2,618 — — 57,928 Honam Wind Power Co., Ltd. 14,724 29.00 % 4,270 32 — — 4,302 Chun-cheon Energy Co., Ltd. 160,919 29.90 % 48,115 3 — — 48,118 Yeonggwangbaeksu Wind Power Co., Ltd. 18,189 15.00 % 2,728 6 — — 2,734 Nghi Son 2 Power LLC 365 50.00 % 183 — — — 183 Kelar S.A 100,192 65.00 % 65,125 2,424 — (316 ) 67,233 PT. Tanjung Power Indonesia 5,075 35.00 % 1,776 — — — 1,776 Incheon New Power Co., Ltd. 2,135 29.00 % 619 — — — 619 Seokmun Energy Co., Ltd. 47,538 29.00 % 13,786 — — — 13,786 Daehan Wind Power PSC (824 ) 50.00 % (412 ) — — 412 — Barakah One Company 3,476 18.00 % 626 — — — 626 Nawah Energy Company 1,436 18.00 % 258 — — — 258 MOMENTUM 1,174 33.33 % 391 — — — 391 Daegu Green Power Co., Ltd. 71,706 29.00 % 20,795 — 84 21,512 42,391 Yeonggwang Wind Power Co., Ltd. 36,740 41.00 % 15,063 231 — — 15,294 Chester Solar IV SpA 2,034 81.82 % 1,664 — — 36 1,700 Chester Solar V SpA 512 81.82 % 419 — — 106 525 Diego de Almagro Solar SpA 2,436 81.82 % 1,993 — — 98 2,091 South Jamaica Power Company Limited 33,522 20.00 % 6,704 — — — 6,704 (*) The percentage of ownership shown above is after considering the treasury stocks and others. 2018 Investees Net assets Percentage of 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.
Unrecognized equity interest in investments in associates and joint ventures	As of December 31, 2017 and 2018, 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: 2017 2018 Unrecognized Accumulated unrecognized Unrecognized Accumulated unrecognized In millions of won Shin Pyeongtaek Power Co., Ltd. ￦ (2,537 ) — — — Kelar S.A (61,309 ) — — — Hadong Mineral Fiber Co., Ltd. (3 ) 2 — 2 PT. Mutiara Jawa (1,159 ) 746 (746 ) — Eurasia Energy Holdings (22 ) 172 7 179 KODE NOVUS I LLC 8,706 53,689 — — KODE NOVUS II LLC 181 23,696 — — Gunsan Bio Energy Co., Ltd. 1,154 1,286 916 2,202 Daehan Wind Power PSC 412 412 (412 ) — Hyundai Energy Co., Ltd. — — 25,841 25,841 Nghi Son 2 Power LLC — — 41,659 41,659 Samcheok Eco Materials Co., Ltd. — — 1,285 1,285
Shareholders' agreements on investments in associates and joint ventures	As of December 31, 2018, 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 case non-controlling (iv) Pyeongchang Wind Power Co., Ltd. In case non-controlling (v) Jeongam Wind Power Co., Ltd. In case non-controlling (vi) Daejung Offshore Wind Power Co., Ltd. In case Samsung Heavy Industries Co., Ltd., a co-participant (vii) Hyundai Green Power Co., Ltd. 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 ￦852.1 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. (viii) YeongGwang Yaksu Wind Electric. Co., Ltd 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 ￦46.8 billion with Hanwha Life Insurance Co., Ltd. and others.
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 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. Changjuk 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. 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. 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. Daegu Green 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. KNH Solar Co., Ltd. Principal and interest, dividends to shareholders cannot be paid without written consent of financial institutions.

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, plant and equipment as of December 31, 2017 and 2018 are as follows: 2017 Acquisition cost Government grants Accumulated depreciation Accumulated losses Book value In millions of won Land ￦ 13,318,542 (21,968 ) — — 13,296,574 Buildings 18,777,678 (63,539 ) (6,722,376 ) (1,776 ) 11,989,987 Structures 66,184,484 (196,414 ) (22,071,667 ) (8,039 ) 43,908,364 Machinery 75,826,292 (183,188 ) (28,904,982 ) (45,512 ) 46,692,610 Ships 4,175 — (3,772 ) — 403 Vehicles 276,425 (6,322 ) (195,260 ) (127 ) 74,716 Equipment 1,440,870 (761 ) (1,020,192 ) (6 ) 419,911 Tools 1,010,537 (1,027 ) (809,842 ) (32 ) 199,636 Construction-in-progress 25,610,649 (49,084 ) — (38,108 ) 25,523,457 Finance lease assets 2,390,680 (27 ) (2,093,001 ) — 297,652 Asset retirement costs 9,395,821 — (3,356,337 ) — 6,039,484 Others 11,247,021 — (8,807,401 ) — 2,439,620 ￦ 225,483,174 (522,330 ) (73,984,830 ) (93,600 ) 150,882,414 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-progress 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
Changes in property, plant and equipment	Changes in property, plant and equipment for the years ended December 31, 2017 and 2018 are as follows: 2017 Beginning Acquisition Disposal Depreciation Impairment(*1) Others Ending balance In millions of won Land ￦ 12,969,741 32,773 (8,961 ) — — 324,989 13,318,542 (Government grants) (3,204 ) — 5 — — (18,769 ) (21,968 ) Buildings 11,784,624 40,592 (19,715 ) (794,804 ) (923 ) 1,043,752 12,053,526 (Government grants) (61,188 ) (900 ) 28 5,996 — (7,475 ) (63,539 ) Structures 43,330,415 428 (519,366 ) (2,421,168 ) (6,856 ) 3,721,325 44,104,778 (Government grants) (197,641 ) — 1,905 10,011 — (10,689 ) (196,414 ) Machinery 43,421,945 421,892 (242,428 ) (4,821,595 ) (43,121 ) 8,139,105 46,875,798 (Government grants) (111,064 ) (10,834 ) 489 17,390 — (79,169 ) (183,188 ) Ships 550 — — (147 ) — — 403 Vehicles 70,970 3,447 (174 ) (34,236 ) (127 ) 41,158 81,038 (Government grants) (107 ) (107 ) 14 1,070 — (7,192 ) (6,322 ) Equipment 376,395 53,529 (413 ) (158,614 ) (6 ) 149,781 420,672 (Government grants) (732 ) (43 ) — 454 — (440 ) (761 ) Tools 179,032 30,990 (166 ) (74,909 ) (32 ) 65,748 200,663 (Government grants) (430 ) — — 354 — (951 ) (1,027 ) Construction-in-progress 27,296,260 11,996,508 (6,487 ) — — (13,713,740 ) 25,572,541 (Government grants) (135,807 ) (42,728 ) — — — 129,451 (49,084 ) Finance lease assets 406,353 — (29,696 ) (107,390 ) — 28,412 297,679 (Government grants) — — — 1 — (28 ) (27 ) Asset retirement costs 4,065,412 — — (518,565 ) — 2,492,637 6,039,484 Others 2,351,532 10,411 (28 ) (762,711 ) — 840,416 2,439,620 ￦ 145,743,056 12,535,958 (824,993 ) (9,658,863 ) (51,065 ) 3,138,321 150,882,414 (*1) Korea Midland 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 impairment loss in the consolidated statements of comprehensive income. 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 impairment loss in the consolidated statements of comprehensive income. The amount includes impairment loss of ￦703,133 million in relation to Wolsong unit 1, and Shin-Hanul unit 3 and 4 as described in note 2, and the loss of ￦7,031 million due to fire at Taean unit 2. (*2) As described in note 29, the amount of acquisition of machinery includes ￦204,787 million of that the Company believes the possibility of economic 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 (Tables)

Investment Properties (Tables)	12 Months Ended
	Dec. 31, 2018
Investment Properties [Abstract]
Investment Properties	Investment properties as of December 31, 2017 and 2018 are as follows: 2017 Acquisition cost Government Accumulated Book value In millions of won Land ￦ 264,205 — — 264,205 Buildings 36,165 (83 ) (15,573 ) 20,509 ￦ 300,370 (83 ) (15,573 ) 284,714 2018 Acquisition cost 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
Changes in investment properties	Changes in investment properties for the years ended December 31, 2017 and 2018 are as follows: 2017 Beginning balance Depreciation Others Ending In millions of won Land ￦ 336,421 — (72,216 ) 264,205 Buildings 17,323 (1,178 ) 4,447 20,592 (Government grants) (64 ) 2 (21 ) (83 ) ￦ 353,680 (1,176 ) (67,790 ) 284,714 2018 Beginning balance 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
Income and expenses related to investment properties	Income and expenses related to investment properties for the years ended December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Rental income ￦ 9,581 9,494 Operating and maintenance expenses related to rental income (1,172 ) (923 ) ￦ 8,409 8,571
Fair value of investment properties	Fair value of investment properties as of December 31, 2017 and 2018 are as follows: 2017 2018 Book value Fair value Book value Fair value In millions of won Land ￦ 264,205 309,241 139,940 167,178 Buildings 20,509 23,319 19,619 23,276 ￦ 284,714 332,560 159,559 190,454 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, 2018
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, 2016, 2017 and 2018 are as follows: 2016 Beginning balance Increase Recognized as revenue Ending In millions of won Nuclear power plant construction in UAE and others ￦ 12,308,839 (1,045,094 ) (4,026,857 ) 7,236,888 (*) For the year ended December 31, 2016, the increased balance of contracts from new orders and other is ￦718,118 million and the decreased balance of contracts due to changes in scope of construction work is ￦1,763,212 million. 2017 Beginning balance Increase (decrease)(*) 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.
Accumulated earned revenue, expense and others	2017 Accumulated earned revenue Accumulated expense Accumulated profit Unearned advance receipts In millions of won Nuclear power plant construction in UAE and others ￦ 18,236,992 16,937,772 1,299,220 — 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 —
Gross amount of assets and liabilities for contract	Gross amount due from customers recognized as assets and due to customers recognized as liabilities for contract work as of December 31, 2017 and 2018 are as follows: 2017 2018 Assets(*1) Liabilities(*2) Assets(*1) Liabilities(*2) In millions of won Nuclear power plant construction in ￦ 55,755 542,921 36,232 350,460 (*1) Included in trade and other receivables, net, in the consolidated statements of financial position. (*2) Included in non-financial

Intangible Assets other than _2

Intangible Assets other than Goodwill (Tables)	12 Months Ended
	Dec. 31, 2018
Intangible Assets other than Goodwill [Abstract]
Intangible Assets other than Goodwill	Intangible assets as of December 31, 2017 and 2018 are as follows: 2017 Acquisition Government Accumulated Accumulated Book value In millions of won Software ￦ 534,191 (486 ) (408,300 ) — 125,405 Licenses and franchises 3,398 — (3,398 ) — — Copyrights, patents rights and other industrial rights 43,857 — (19,876 ) — 23,981 Mining rights 553,876 — (14,243 ) — 539,633 Development expenditures 836,996 (3,702 ) (752,478 ) — 80,816 Intangible assets under development 143,851 (10,540 ) — (3,941 ) 129,370 Usage rights of donated assets and other 459,682 (11 ) (358,024 ) — 101,647 Leasehold rights 24,306 — (19,262 ) — 5,044 Others 297,289 — (103,995 ) (12,069 ) 181,225 ￦ 2,897,446 (14,739 ) (1,679,576 ) (16,010 ) 1,187,121 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
Changes in intangible assets	Changes in intangible assets for the years ended December 31, 2017 and 2018 are as follows: 2017 Beginning Acquisition Disposal Amortization Impairment Others Ending In millions of won Software ￦ 93,221 12,700 (5 ) (44,809 ) — 64,784 125,891 (Government grants) (595 ) (17 ) — 255 — (129 ) (486 ) Copyrights, patents rights and other industrial rights 20,081 30 (7 ) (3,350 ) — 7,227 23,981 Mining rights 538,860 26,751 (272 ) (4,640 ) — (21,066 ) 539,633 Development expenditures 62,405 494 — (25,924 ) — 47,543 84,518 (Government grants) (5,152 ) — — 2,811 — (1,361 ) (3,702 ) Intangible assets under development 115,533 56,527 — — (20 ) (32,130 ) 139,910 (Government grants) (11,090 ) — — — — 550 (10,540 ) Usage rights of donated assets and other 84,102 — — (14,462 ) — 32,018 101,658 (Government grants) (21 ) — — 10 — — (11 ) Leasehold rights 4,632 — — (545 ) — 957 5,044 Greenhouse gas emissions rights 6,283 — — — — (6,283 ) — Others 72,562 47,402 (377 ) (23,018 ) 54 84,602 181,225 (Government grants) — — — — — — — ￦ 980,821 143,887 (661 ) (113,672 ) 34 176,712 1,187,121 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 ) Licenses and franchises 23,981 28 — (8,665 ) (13 ) 51,781 67,112 Copyrights, patents rights and other industrial 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 (*) ￦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, is included.
Significant specific intangible assets	Significant specific intangible assets as of December 31, 2017 and 2018 are as follows: 2017 Type Description Currency Amount Remaining useful lives In millions of won and thousands of Australian dollars Software ERP system and others KRW 1,135 3 years and 2 months ~ 3 years and 4 months AMI GATEWAY S/W KRW 3,528 3 years and 2 months Copyrights, patents rights and other industrial rights Smart technology verification and standard design project conducting right KRW 11,724 4 years and 9 months Mining rights Mining right of Bylong mine AUD 401,225 — (*) Development expenditures Electricity sales information system KRW 29,391 4 years and 3 months Intangible assets under development Contributions to ARP NRC DC KRW 46,458 — Usage rights of donated assets and others Sejong Haengbogdosi sharing charge Dangjin power plant load facility usage right KRW KRW 40,460 20,463 8 years and 11 months 3 years and 3 months Others Occupancy and use of public waters KRW 103,269 18 years and 11 months (*) Mining rights are amortized using the units-of-production 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 17 years and 11 months (*) Mining rights are amortized using the units-of-production
Recognized research and development expenses	For the years ended December 31, 2016, 2017 and 2018, the Company recognized research and development expenses of ￦ 705,504 million, ￦ 721,437 million and ￦ 723,888 million, respectively.

Trade and Other Payables (Table

Trade and Other Payables (Tables)	12 Months Ended
	Dec. 31, 2018
Trade and Other Payables [Abstract]
Trade and Other Payables	Trade and other payables as of December 31, 2017 and 2018 are as follows: 2017 2018 Current Non-current Current Non-current In millions of won Trade payables ￦ 2,936,990 — 3,411,830 — Other trade payables 1,649,933 2,825,039 1,630,860 2,626,876 Accrued expenses 1,087,844 1,951 1,127,796 1,859 Leasehold deposits received 1,562 1,308 1,949 1,084 Other deposits received 186,817 102,896 169,317 72,453 Finance lease liabilities 131,792 286,468 57,200 226,606 Dividends payable 4,448 — 6,443 — Others(*) 135 5,818 — 12,818 ￦ 5,999,521 3,223,480 6,405,395 2,941,696 (*) Details of others as of December 31, 2017 and 2018 are as follows: 2017 2018 Current Non-current Current Non-current In millions of won Advance received from local governments ￦ — 5,818 — 5,818 Others 135 — — 7,000 ￦ 135 5,818 — 12,818

Borrowings and Debt Securities

Borrowings and Debt Securities (Tables)	12 Months Ended
	Dec. 31, 2018
Borrowings and Debt Securities [Abstract]
Borrowings and Debt Securities	Borrowings and debt securities as of December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Current liabilities Short-term borrowings ￦ 1,038,328 860,602 Current portion of long-term borrowings 128,543 312,994 Current portion of debt securities 7,961,182 6,790,778 Less : Current portion of discount on long-term borrowings (886 ) (972 ) Less : Current portion of discount on debt securities (3,882 ) (1,974 ) Add : Current portion of premium on debt securities — 20 9,123,285 7,961,448 Non-current Long-term borrowings 2,455,737 3,280,015 Debt securities 43,270,825 49,905,077 Less : Discount on long-term borrowings (21,113 ) (22,000 ) Less : Discount on debt securities (81,424 ) (89,913 ) Add: Premium on debt securities 82 — 45,624,107 53,073,179 ￦ 54,747,392 61,034,627
Repayment schedule of borrowings and debt securities	Repayment schedule of borrowings and debt securities as of December 31, 2017 and 2018 are as follows: 2017 Type Borrowings Debt Securities In millions of won Less than 1 year ￦ 1,166,871 7,961,182 1~ 5 years 1,117,222 25,047,075 Over 5 years 1,338,515 18,223,750 ￦ 3,622,608 51,232,007 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
Short-term borrowings	Short-term borrowings as of December 31, 2017 and 2018 are as follows: 2017 Type Creditor Interest rate (%) Maturity Foreign currency Local currency In millions of won and thousands of foreign currencies Local short-term 1.57~2.47 2018.01.12~ 2018.09.19 — ￦ 686,561 Foreign short-term SCNT and others 4.60~6.50 2018.12.03 USD 8,955 9,594 Foreign short-term Export-import Bank of 3M 2018.12.18 AUD 327,259 273,314 Local bank overdraft Nonghyup Bank 3.04 2018.01.02 — 51,300 Local bank overdraft Woori Bank Standard overdraft 2018.02.27 — 17,559 ￦ 1,038,328 2018 Type Creditor Interest rate (%) Maturity Foreign currency Local currency In millions of won and thousands of foreign currencies Local short-term 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 (*) 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	7 8 2017 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 2018~2044 — ￦ 4,909 Facility 2.45~4.60 2023~2028 — 68,883 Facility 1yr KoFC bond rate +0.31 2018 — 25,000 Operating funds 2.59~3.04 2018~2020 — 47,000 Operating funds 1yr KoFC bond 2020 — 14,000 KEB Hana Bank Commercial Paper 3M CD+0.24~0.32 2021~2022 — 400,000 Facility 4.60 2028 — 15,038 Facility 3yr KTB rate-1.25 2018~2028 — 8,947 IBK PF Refinancing CD+1.25 2030 — 22,500 Export-Import Bank of Korea Project loans 1.50 2026 — 25,042 Operating funds 2.21 2020 — 35,000 Korea Energy Agency Development of power resources 3yr KTB rate-2.25 2023~2025 — 6,765 Facility 3yr KTB rate-2.25 2018~2024 — 3,121 Project loans — 2022~2025 — 3,733 Others KTB rate -2.25 2024~2028 — 18,455 Shinhan Bank Collateral borrowing 2.32 2019 — 30,000 Facility CB rate +1.10 2028 — 22,557 Operating funds 2.70 2018 — 15,000 Others 4.10 2035 — 105,000 Others Standard overdraft rate+1.10 2035 — 105,000 Kookmin Bank Facility 3.16 2020 — 10,000 Facility MOR+0.79 2023 — 35,000 Others Facility 1.75~4.60 2026~2029 — 148,423 Facility CB rate+1.10~1.20 2022~2028 — 46,278 PF Refinancing 4.10 2030 — 62,500 Others 4.50~8.00 2022~2039 — 102,346 1,380,497 Foreign long-term borrowings Korea Energy Agency Project loans — 2021~2023 USD 8,744 9,368 Export-Import Bank of Korea and others Direct loan and others 1M Libor+1.80~ 3.20 2036 USD 64,913 69,548 Direct loan and others 3M Libor+2.75~ 3.70 2027 JOD 168,663 254,514 Commercial loan and others 3M Libor+1.50~ 2.50 2030~2033 USD 289,026 309,662 PF Loan 6M Libor+1.70~ 2.50 2032 USD 123,253 132,054 SCNT and others Shareholder’s loan 6.50~8.00 2023 USD 41,718 ￦ 44,697 Shareholder’s loan 8.00 2031 JOD 5,136 7,750 PT PJB Shareholder’s loan 12.75 2019 IDR 10,932,568 864 Samsung Life Insurance and others Syndicated Loan 3.10 2032 JPY 5,325,000 50,540 Woori Bank and others Syndicated Loan JPY 6M Libor+2.00 2032 JPY 3,435,000 32,602 SMBC and others Equity Bridge Loan 1M Libor+0.90 2019 USD 70,986 76,054 IFC and others Others 6M Libor+5.00 2031 PKR 16,652,350 161,195 Federal Financing Bank PF loan 2.39 2031 USD 48,366 51,819 Others Others — 2019 USD 2,907 3,116 1,203,783 2,584,280 Less : Discount of long-term borrowings (21,999 ) Less : Current portion of long-term borrowings (128,543 ) Add : Current portion of discount on long-term borrowings 886 ￦ 2,434,624 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 rate +0.95 2020 — 14,000 KEB 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 rate+1.00 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 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 Others 3.88 2021 USD 278,105 310,427 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 of 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
Local debt securities	Local debt securities as of December 31, 2017 and 2018 are as follows: Issue date Maturity Interest rate (%) 2017 2018 In millions of won Electricity Bonds 2009.12.03~ 2018.12.04 2019.01.08~ 2048.10.29 1.62~5.45 ￦ 20,700,000 24,480,000 Electricity Bonds 2013.06.25 2018.06.25 3M CD+0.31 150,000 — Corporate Bonds(*1) 2009.05.04~ 2018.11.09` 2019.01.21~ 2048.11.09 1.36~6.00 21,122,708 23,223,228 41,972,708 47,703,228 Less : Discount on local debt securities (37,816 ) (41,247 ) Less : Current portion of local debt securities (5,200,000 ) (5,330,000 ) Add : Current portion of discount on local debt securities 923 1,035 ￦ 36,735,815 42,333,016 (*1) 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, 2017 and 2018 are as follows: 2017 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 249,070 ￦ 266,854 FY-97 1997.01.31~ 1997.08.04 2027.02.01~ 2027.08.01 6.75~7.00 USD 314,717 337,188 FY-04 2004.04.23 2034.04.23 5.13 USD 286,920 307,406 FY-08 2008.11.27 2018.11.27 4.19 JPY 20,000,000 189,822 FY-11 2011.07.13 2021.07.13 4.75 USD 500,000 535,700 FY-12 2012.09.19 2022.09.19 3.00 USD 750,000 803,550 FY-13 2013.02.05~ 2013.11.27 2018.02.05~ 2018.11.27 1.88~2.88 USD 1,900,000 2,035,660 FY-13 2013.09.26~ 2013.10.23 2019.03.26~ 2019.04.23 1.50~1.63 CHF 400,000 437,888 FY-13 2013.09.25 2020.09.25 5.75 AUD 325,000 271,427 FY-13 2013.02.20~ 2013.07.25 2018.02.20~ 2018.07.25 3M Libor+0.84~1.50 USD 500,000 535,700 FY-14 2014.02.11~ 2014.12.02 2019.02.11~ 2029.07.30 2.38~3.57 USD 1,500,000 1,607,100 FY-15 2015.06.15 2025.06.15 3.25 USD 300,000 321,420 FY-16 2016.01.21 2021.07.21 2.50 USD 300,000 321,420 FY-17 2017.04.12~ 2017.07.25 2020.04.12~ 2027.07.25 2.38~3.13 USD 1,100,000 1,178,540 FY-17 2017.10.30 2037.10.30 1.70 EUR 40,000 51,170 FY-17 2017.11.16 2037.11.16 2.36 SEK 450,000 58,454 9,259,299 Less : Discount on foreign debt securities (47,490 ) Add : Premium on foreign debt securities 82 Less : Current portion of foreign debt securities (2,761,182 ) Add : Current portion of discount on foreign debt securities 2,959 ￦ 6,453,668 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
Changes in borrowings and debt securities	Changes in borrowings and debt securities for the years ended December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Beginning balance ￦ 53,639,205 54,747,392 Cash flow 2,269,513 5,972,336 Effect of exchange rate fluctuations (1,169,418 ) 322,515 Others 8,092 (7,616 ) Ending balance ￦ 54,747,392 61,034,627

Finance Lease Liabilities (Tabl

Finance Lease Liabilities (Tables)	12 Months Ended
	Dec. 31, 2018
Finance Lease Liabilities [Abstract]
Finance Lease Liabilities	Finance lease liabilities as of December 31, 2017 and 2018 are as follows and are included in current and non-current 2017 2018 Minimum lease Present value of Minimum lease Present value of In millions of won Less than 1 year ￦ 174,534 131,792 87,709 57,200 1 ~ 5 years 272,994 204,069 228,783 170,676 More than 5 years 108,748 82,399 65,250 55,930 ￦ 556,276 418,260 381,742 283,806
Current and non-current portion of financial lease liabilities	Current and non-current 2017 2018 In millions of won Current finance lease liabilities ￦ 131,792 57,200 Non-current 286,468 226,606 ￦ 418,260 283,806
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 years ended December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Minimum lease payment ￦ 158,859 111,530 Contingent rent payment (21,024 ) (18,872 )
Changes in finance lease liabilities	Changes in finance lease liabilities for the years ended December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Beginning balance ￦ 541,179 418,260 Cash flow (122,919 ) (134,454 ) Acquisition of finance lease assets — — Ending balance ￦ 418,260 283,806

Employment Benefits (Tables)

Employment Benefits (Tables)	12 Months Ended
	Dec. 31, 2018
Employment Benefits [Abstract]
Employment Benefits	Employment benefit obligations as of December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Net defined benefit obligations ￦ 1,476,201 1,638,785 Other long-term employee benefit obligations 6,868 6,284 ￦ 1,483,069 1,645,069
Principal assumptions on actuarial valuation	Principal assumptions on actuarial valuation as of December 31, 2017 and 2018 are as follows: 2017 2018 Discount rate 2.75%~2.90% 2.24%~2.90% Future salary and benefit levels 4.88% 4.88% Weighted average duration 13.40 years 13.71 years
Details of expense relating to defined benefit plans	Details of expense relating to defined benefit plans for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 2017 2018 In millions of won Current service cost ￦ 378,930 392,820 369,899 Interest cost 67,104 79,524 87,687 Expected return on plan assets (23,612 ) (31,307 ) (42,135 ) Loss from settlement (706 ) (1,055 ) (767 ) ￦ 421,716 439,982 414,684 Expenses as described above are recognized in those items below in the financial statements. 2016 2017 2018 In millions of won Cost of sales ￦ 312,391 332,249 308,672 Selling and administrative expenses 61,362 59,111 51,903 Others (Construction-in-progress 47,963 48,622 54,109 ￦ 421,716 439,982 414,684 In addition, for the years ended December 31, 2016, 2017 and 2018, employee benefit obligations expenses of ￦62,435 million, ￦65,603 million and ￦66,833 million, respectively, are recognized as cost of sales, and ￦11,450 million, ￦11,983 million and ￦13,204 million, respectively, are recognized as selling and administrative expenses, and ￦14,024 million, ￦13,332 million and ￦14,189 million, respectively, are recognized as construction-in-progress
Details of defined benefits	Details of defined benefit obligations as of December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Present value of defined benefit obligation from funded plans ￦ 2,951,842 3,414,116 Fair value of plan assets (1,475,641 ) (1,775,331 ) 1,476,201 1,638,785 Present value of defined benefit obligation from unfunded plans — — Net liabilities incurred from defined benefit plans ￦ 1,476,201 1,638,785
Changes in the present value of defined benefits	2017 2018 In millions of won Beginning balance ￦ 2,867,377 2,951,842 Current service cost 392,820 369,899 Interest cost(*) 79,524 87,687 Remeasurement component (258,223 ) 154,939 Loss from settlement (1,055 ) (767 ) Actual payments (128,707 ) (149,454 ) Others 106 (30 ) Ending balance ￦ 2,951,842 3,414,116 (*) 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, 2017 and 2018 are as follows: 2017 2018 In millions of won Beginning balance ￦ 1,188,907 1,475,641 Expected return 31,307 42,135 Remeasurement component (10,435 ) (12,308 ) Contributions by the employers 325,080 330,064 Actual payments (59,218 ) (60,201 ) Ending balance ￦ 1,475,641 1,775,331 In addition, loss on accumulated remeasurement component amounting to ￦43,513 million and ￦219,381 million has been recognized as other comprehensive income or loss for the years ended December 31, 2017 and 2018, respectively.
Details of the fair value of plan assets	Details of the fair value of plan assets as of December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Equity instruments ￦ 79,204 96,823 Debt instruments 517,040 510,184 Bank deposit 293,477 275,518 Others 585,920 892,806 ￦ 1,475,641 1,775,331 For the years ended December 31, 2017 and 2018, actual returns on plan assets amounted to ￦20,782 million and ￦29,827 million, respectively.
Remeasurement component recognized in other comprehensive income (loss)	Remeasurement component recognized in other comprehensive income (loss) for the years ended December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Actuarial gain from changes in financial assumptions ￦ (300,058 ) 186,428 Experience adjustments, etc. 41,835 (31,489 ) Expected return 10,435 12,308 ￦ (247,788 ) 167,247 Remeasurement component recognized as other comprehensive income or loss is recorded in retained earnings.

Provisions (Tables)

Provisions (Tables)	12 Months Ended
	Dec. 31, 2018
Provisions [Abstract]
Provisions	Provisions as of December 31, 2017 and 2018 are as follows: 2017 2018 Current Non-current Current Non-current In millions of won Employment benefits Provisions for employment benefits ￦ 913,787 — 976,347 — Litigation Litigation provisions 48,621 24,955 40,157 37,636 Decommissioning cost Nuclear plants — 13,007,228 — 13,388,134 Spent fuel — 1,339,046 — 1,291,354 Radioactive waste 11,494 1,626,877 4,310 1,680,698 PCBs — 180,087 — 147,668 Other recovery provisions — 6,659 — 10,477 Others Power plant regional support program 153,756 — 137,668 — Transmission regional support program 243,365 — 151,698 — Provisions for tax 61 — 6,845 — Provisions for financial guarantee — 23,475 1,320 14,266 Provisions for RPS 271,624 — 93,919 — Provisions for greenhouse gas emissions obligations 414,252 — 136,187 — Others 80,538 16,387 46,347 15,515 ￦ 2,137,498 16,224,714 1,594,798 16,585,748
Changes in provisions	Changes in provisions for the years ended December 31, 2017 and 2018 are as follows: 2017 Beginning Increase in Payment Reversal Others Ending balance In millions of won Employment benefits Provisions for employment benefits ￦ 810,607 984,896 (880,255 ) (1,461 ) — 913,787 Litigation Litigation provisions 198,237 34,629 (152,461 ) (7,096 ) 267 73,576 Decommissioning cost Nuclear plants 10,195,928 2,818,033 (6,733 ) — — 13,007,228 Spent fuel 1,374,225 307,682 (342,861 ) — — 1,339,046 Radioactive waste 1,479,502 222,632 (63,763 ) — — 1,638,371 PCBs 191,744 5,309 (14,266 ) (2,700 ) — 180,087 Other recovery provisions 507 5,939 — — 213 6,659 Others Power plant regional support program 152,851 94,039 (103,889 ) — 10,755 153,756 Transmission regional support program 282,608 143,178 (182,421 ) — — 243,365 Provisions for tax 242 — (25 ) (136 ) (20 ) 61 Provisions for financial guarantee 29,665 3,760 — (9,945 ) (5 ) 23,475 Provisions for RPS 417,404 242,946 (388,726 ) — — 271,624 Provisions for greenhouse gas emissions obligations 249,644 422,666 (256,758 ) (1,300 ) — 414,252 Others(*) 43,975 6,639 (3,348 ) (26,477 ) 76,136 96,925 ￦ 15,427,139 5,292,348 (2,395,506 ) (49,115 ) 87,346 18,362,212 (*) The Company believes that the possibility of economic outflow is probable on the cost of construction suspension of Shin-Kori unit 5 and 6 for three months. For this reason, the Company recognized ￦77,261 million of provision as addition to construction-in-progress. 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 53.(1), the Company believes that the possibility of economic 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 as addition to property, plant and equipment.

Government Grants (Tables)

Government Grants (Tables)	12 Months Ended
	Dec. 31, 2018
Government grants [Abstract]
Government Grants	Government grants as of December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Land ￦ (21,968 ) (21,968 ) Buildings (63,539 ) (63,189 ) Structures (196,414 ) (190,854 ) Machinery (183,188 ) (173,242 ) Vehicles (6,322 ) (4,220 ) Equipment (761 ) (418 ) Tools (1,027 ) (675 ) Construction-in-progress (49,084 ) (54,740 ) Finance lease assets (27 ) (26 ) Investment properties (83 ) (50 ) Software (486 ) (420 ) Development expenditures (3,702 ) (2,110 ) Intangible assets under development (10,540 ) (10,564 ) Usage rights of donated assets and other (11 ) — Other intangible assets other than goodwill — — ￦ (537,152 ) (522,476 )
Changes in government Grants	Changes in government grants for the years ended December 31, 2017 and 2018 are as follows: 2017 Beginning Receipt Acquisition Offset the Disposal Others Ending In millions of won Cash ￦ — (55,533 ) — — — 55,533 — Land (3,204 ) — — — 5 (18,769 ) (21,968 ) Buildings (61,188 ) — — 5,996 28 (8,375 ) (63,539 ) Structures (197,641 ) — — 10,011 1,905 (10,689 ) (196,414 ) Machinery (111,064 ) — — 17,390 489 (90,003 ) (183,188 ) Vehicles (107 ) — — 1,070 14 (7,299 ) (6,322 ) Equipment (732 ) — — 454 — (483 ) (761 ) Tools (430 ) — — 354 — (951 ) (1,027 ) Construction-in-progress (135,807 ) — 129,451 — — (42,728 ) (49,084 ) Finance lease assets — — — 1 — (28 ) (27 ) Investment properties (64 ) — — 2 — (21 ) (83 ) Software (595 ) — — 255 — (146 ) (486 ) Development expenditures (5,152 ) — — 2,811 — (1,361 ) (3,702 ) Intangible assets under development (11,090 ) — — — — 550 (10,540 ) Usage rights of donated assets and other (21 ) — — 10 — — (11 ) Others — — — — — — — ￦ (527,095 ) (55,533 ) 129,451 38,354 2,441 (124,770 ) (537,152 ) 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 — — — Others — — — — — — — ￦ (537,152 ) (30,416 ) 18,239 40,028 4,124 (17,299 ) (522,476 )

Deferred Revenues (Tables)

Deferred Revenues (Tables)	12 Months Ended
	Dec. 31, 2018
Deferred Revenues [Abstract]
Deferred Revenues	Deferred revenue related to the Company’s construction contracts for the years ended December 31, 2017 and 2018 are as follows which included in current and non-current non-financial 2017 2018 In millions of won Beginning balance ￦ 7,825,765 8,325,181 Increase during the current year 978,389 875,930 Recognized as revenue during the current year (478,973 ) (594,548 ) Ending balance ￦ 8,325,181 8,606,563

Non-financial Liabilities (Tabl

Non-financial Liabilities (Tables)	12 Months Ended
	Dec. 31, 2018
Other Liabilities Disclosure [Abstract]
Non-financial Liabilities	Non-financial 2017 2018 Current Non-current Current Non-current In millions of won Advance received ￦ 3,772,713 181,612 3,724,238 80,937 Unearned revenue 41,593 19,718 63,038 4,690 Deferred revenue 476,631 7,848,550 556,072 8,050,491 Withholdings 164,370 10,529 172,454 10,856 Others 1,129,001 12,025 1,058,239 13,059 ￦ 5,584,308 8,072,434 5,574,041 8,160,033

Contributed Capital (Tables)

Contributed Capital (Tables)	12 Months Ended
	Dec. 31, 2018
Disclosure of classes of share capital [Abstract]
Issued Capital	Details of shares issued as of December 31, 2017 and 2018 are as follows: 2017 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. 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.
Number of Issued Capital	Details in number of outstanding capital stock for the years ended December 31, 2017 and 2018 are as follows. 2017 2018 Number of shares Beginning balance 641,964,077 641,964,077 Ending balance 641,964,077 641,964,077
Share premium	Details of share premium as of December 31, 2017 and 2018 are as follows: 2017 2018 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, 2018
Disclosure of Retained Earnings and Dividends Paid [Abstract]
Retained Earnings	Details of retained earnings as of December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Legal reserve(*) ￦ 1,604,910 1,604,910 Voluntary reserves 34,833,844 35,906,267 Retained earnings before appropriations 16,931,804 14,007,942 Retained earnings ￦ 53,370,558 51,519,119 (*) 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, 2017 and 2018 are as follows: 2017 2018 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 29,016,395 30,088,818 Reserve for equalizing dividends 210,000 210,000 ￦ 34,833,844 35,906,267 (*) 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	Changes in retained earnings for the years ended December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Beginning balance ￦ 53,173,871 53,370,558 Effect of change in accounting policy — 71,928 Net profit (loss) for the period attributed to owner of the Company 1,298,720 (1,314,567 ) Changes in equity method retained earnings 10,065 (1,153 ) Remeasurements of defined benefit liability, net of tax 158,991 (100,495 ) Dividends paid (1,271,089 ) (507,152 ) Ending balance ￦ 53,370,558 51,519,119
Dividends Paid	Dividends paid for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 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 ￦ 3,100 1,990,089 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
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, 2017 and 2018 are as follows: 2017 2018 In millions of won Beginning balance ￦ (4,943 ) 5,122 Changes 10,065 (1,153 ) Ending balance ￦ 5,122 3,969
Changes in retained earnings of remeasurement components	Changes in remeasurement components for the years ended December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Beginning balance ￦ (222,997 ) (43,513 ) Changes 239,636 (154,198 ) Income tax effect (80,645 ) 53,703 Transfer to reserve for business expansion 20,493 (75,373 ) Ending balance ￦ (43,513 ) (219,381 )

Statement of Appropriation of_2

Statement of Appropriation of Retained Earnings (Tables)	12 Months Ended
	Dec. 31, 2018
Statement of Appropriation of Retained Earnings [Abstract]
Statement of Appropriation of Retained Earnings	For the year ended December 31, 2017, KEPCO’s retained earnings were appropriated on March 30, 2018. For the year ended December 31, 2018, KEPCO’s deficits are expected to be appropriated on March 22, 2019. Statements of disposition of deficit and appropriation of retained earnings of KEPCO, the controlling company, for the years ended December 31, 2017 and 2018, respectively, are as follows: 2017 2018 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) 1,506,852 (1,095,213 ) Remeasurements of the defined benefit plan 72,723 (65,442 ) 1,579,575 (1,120,842 ) II. Transfer from voluntary reserves — 1,120,842 III.  Subtotal (I+II) 1,579,575 — IV.  Appropriations of retained earnings (1,579,575 ) — Legal reserve — — Dividends (government, individual) Amount of dividends per share (%) : Current year—￦0 Prior year—￦790 (16%) (507,152 ) — Reserve for business expansion (1,072,423 ) — V. Unappropriated retained earnings to be carried over forward to subsequent year — —

Hybrid Bonds (Tables)

Hybrid Bonds (Tables)	12 Months Ended
	Dec. 31, 2018
Hybrid Bonds [Abstract]
Hybrid Bonds	Hybrid bonds classified as equity (non-controlling Issuer Hybrid bond Issued date Maturity Yield (%) 2017 2018 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

Other Components of Equity (Tab

Other Components of Equity (Tables)	12 Months Ended
	Dec. 31, 2018
Other Components of Equity [Abstract]
Other Components of Equity	Other components of equity of the parent as of December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Other capital surplus ￦ 1,233,793 1,234,825 Accumulated other comprehensive loss (271,457 ) (358,570 ) Other equity 13,294,973 13,294,973 ￦ 14,257,309 14,171,228
Changes in other capital surplus	Changes in other capital surplus for the years ended December 31, 2017 and 2018 are as follows: 2017 2018 Gains on treasury stocks Others Subtotal Gains on disposal of treasury stocks Others Subtotal In millions of won Beginning balance ￦ 387,524 847,622 1,235,146 387,524 846,269 1,233,793 Issuance of share capital of subsidiary — (1,378 ) (1,378 ) — 1,032 1,032 Others — 25 25 — — — Ending balance ￦ 387,524 846,269 1,233,793 387,524 847,301 1,234,825
Changes in accumulated other comprehensive income (loss)	Changes in accumulated other comprehensive income (loss) for the years ended December 31, 2017 and 2018 are as follows: 2017 Available-for-sale financial asset valuation reserve Shares in other Income (loss) of investments in associates and Reserve for overseas translation credit Reserve for gain (loss) on derivatives Total In millions of won Beginning balance ￦ 36,370 221,455 (223,056 ) (68,644 ) (33,875 ) Changes in the unrealized fair value of available-for-sale (7,102 ) — — — (7,102 ) Shares in other comprehensive loss of associates and joint ventures, net of tax — (154,991 ) — — (154,991 ) Foreign currency translation of foreign operations, net of tax — — (95,103 ) — (95,103 ) Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax — — — 19,614 19,614 Ending balance ￦ 29,268 66,464 (318,159 ) (49,030 ) (271,457 ) 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 )
Changes in other equity	Details of changes in other equity for the years ended December 31, 2017 and 2018 are as follows: 2017 2018 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, 2018
Revenue [Abstract]
Sales	Details of sales for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 2017 2018 Domestic Overseas Domestic Overseas Domestic Overseas In millions of won [Type of goods and services] Sales of goods ￦ 54,982,095 397,392 55,373,316 399,232 57,514,866 382,938 Electricity 54,304,529 — 54,649,882 — 56,842,011 — Heat supply 181,597 — 205,838 — 216,117 — Others 495,969 397,392 517,596 399,232 456,738 382,938 Sales of service 195,697 161,046 186,990 164,167 176,539 216,328 Sales of construction services 132,219 3,894,638 92,501 3,119,683 108,586 1,633,805 ￦ 55,310,011 4,453,076 55,652,807 3,683,082 57,799,991 2,233,071 [Timing of revenue recognition] Performance obligations satisfied at a point in time ￦ 54,982,095 397,392 55,373,316 399,232 57,514,866 382,938 Performance obligations satisfied over time 327,916 4,055,684 279,491 3,283,850 285,125 1,850,133 ￦ 55,310,011 4,453,076 55,652,807 3,683,082 57,799,991 2,233,071

Selling and Administrative Ex_2

Selling and Administrative Expenses (Tables)	12 Months Ended
	Dec. 31, 2018
Selling, general and administrative expense [Abstract]
Selling and Administrative Expenses	Selling and administrative expenses for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 2017 2018 In millions of won Salaries ￦ 734,930 735,383 757,819 Retirement benefit expense 72,812 71,094 65,107 Welfare and benefit expense 162,243 179,406 132,089 Insurance expense 11,513 15,414 12,181 Depreciation 169,431 190,245 214,499 Amortization of intangible assets 35,171 44,990 54,153 Bad debt expense 38,719 126,714 39,784 Commission 605,879 673,740 714,096 Advertising expense 34,658 114,519 30,894 Training expense 6,314 7,027 6,277 Vehicle maintenance expense 10,390 9,998 10,148 Publishing expense 3,643 3,672 3,307 Business promotion expense 3,477 3,700 2,785 Rent expense 40,020 38,380 42,851 Telecommunication expense 25,448 24,916 23,505 Transportation expense 596 495 686 Taxes and dues 46,531 48,395 46,424 Expendable supplies expense 6,834 7,731 6,166 Water, light and heating expense 9,720 10,545 12,629 Repairs and maintenance expense 75,122 63,477 62,580 Ordinary development expense 188,063 211,417 215,494 Travel expense 16,115 16,658 14,363 Clothing expense 8,273 8,410 10,108 Survey and analysis expense 666 698 705 Membership fee 1,132 1,122 1,043 Others 331,532 154,709 148,197 ￦ 2,639,232 2,762,855 2,627,890
Other selling and administrative expenses	Other selling and administrative expenses for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 2017 2018 In millions of won Accommodation development expenses ￦ 186,896 55,799 52,822 Miscellaneous wages 31,907 32,300 32,447 Litigation and filing expenses 12,328 11,881 12,853 Compensation for damages 60,341 12,297 19,193 Outsourcing expenses 3,530 2,647 3,036 Reward expenses 3,267 2,786 2,713 Overseas market development expenses 2,177 1,876 1,361 Others 31,086 35,123 23,772 ￦ 331,532 154,709 148,197

Other Income and Expense (Table

Other Income and Expense (Tables)	12 Months Ended
	Dec. 31, 2018
Disclosure of other operating income (expense) [Abstract]
Other Income	Other income for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 2017 2018 In millions of won Reversal of other provisions ￦ 22,034 35,265 12,700 Reversal of other allowance for doubtful accounts 5,489 2,166 143 Gains on government grants 111 430 482 Gains on assets contributed 12,254 4,218 17,336 Gains on liabilities exempted 1,959 3,166 10,303 Compensation and reparations revenue 114,530 89,196 89,901 Revenue from research contracts 13,143 12,580 6,818 Income related to transfer of assets from customers 427,297 478,973 594,548 Rental income 211,580 192,136 186,631 Others 31,787 50,988 51,032 ￦ 840,184 869,118 969,894
Details of others of other income	Details of others of other income for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 2017 2018 In millions of won Refund of claim for rectification ￦ 8,722 9,655 8,933 Adjustment of research project 4,148 3,884 2,267 Maintenance expenses on lease building 354 135 176 Training expenses 4,478 3,045 3,220 Deposit redemption 991 34 7 Reversal of expenses on litigation 893 360 753 Revenue on royalty fee 2,486 2,888 6,909 Reimbursement of insurance fee — 1,498 7,145 Gains on guarantee contracts 2,796 456 39 Others 6,919 29,033 21,583 ￦ 31,787 50,988 51,032
Other Expense	Other expense for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 2017 2018 In millions of won Compensation and indemnification expense ￦ — 37 23,437 Accretion expenses of other provisions 4,556 7,535 41,924 Depreciation expenses on investment properties 678 1,176 923 Depreciation expenses on idle assets 6,639 6,644 6,547 Other bad debt expense 4,585 1,778 17,827 Donations 114,094 119,421 63,743 Others 58,072 43,464 76,929 ￦ 188,624 180,055 231,330
Details of others of other expense	Details of others of other expense for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 2017 2018 In millions of won Operating expenses related to the idle assets ￦ 459 136 47 Research grants 1,461 1,180 461 Supporting expenses on farming and fishing village 15,201 11,956 13,537 Operating expenses on fitness center 2,706 3,498 4,788 Expenses on adjustment of research and development grants — 806 404 Taxes and dues 4,582 2,270 199 Expenses on R&D supporting 690 5,459 53 Others(*) 32,973 18,159 57,440 ￦ 58,072 43,464 76,929 (*) Others include ￦38,886 million of impairment loss on construction-in-progress

Other Gains (Losses) (Tables)

Other Gains (Losses) (Tables)	12 Months Ended
	Dec. 31, 2018
Other Gains (Losses) [Abstract]
Other Gains (Losses)	Composition of other gains (losses) for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 2017 2018 In millions of won Other gains Gains on disposal of property, plant, and equipment ￦ 74,035 48,316 98,077 Gains on disposal of intangible assets — 564 12 Reversal of impairment loss on intangible assets 3 54 17 Gains on foreign currency translation 15,311 20,485 14,905 Gains on foreign currency transaction 55,377 93,151 47,297 Gains on insurance proceeds — 400 — Others 187,792 269,562 221,556 Other losses Losses on disposal of property, plant and equipment (42,715 ) (70,514 ) (60,704 ) Losses on disposal of intangible assets (158 ) (183 ) (43 ) Impairment loss on property, plant and equipment — (51,067 ) (710,162 ) Impairment loss on intangible assets (3,945 ) (20 ) (8,112 ) Impairment loss on other non-current — — (87,024 ) Losses on foreign currency translation (23,835 ) (25,495 ) (7,678 ) Losses on foreign currency transaction (72,058 ) (36,241 ) (65,366 ) Others (119,309 ) (92,385 ) (63,899 ) ￦ 70,498 156,627 (621,124 )
Details of others of other gains	Details of others of other gains for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 2017 2018 In millions of won Gains on disposal of inventories ￦ 9,494 6,024 6,350 Gains on valuation of inventories 2 — — Gains on proxy collection of TV license fee 38,991 39,711 40,450 Gains on compensation of impaired electric poles 3,650 1,526 1,166 Gains on compensation for infringement on contract 3,040 18,990 3,648 Gains on harbor facilities dues 2,957 3,025 3,803 Gains on technical fees 1,271 2,105 2,026 Reversal of occupation development training fees 1,756 1,697 1,602 Gains on disposal of waste 4,222 4,261 4,232 Gains on insurance 3,786 10,410 22,382 Gains on tax rebate 5,226 2,161 542 Gains on other commission 4,639 4,790 4,347 Gains on research tasks 10 — — Gains on settlement and others 2,188 — — Gains on sales of greenhouse gas emissions rights 46 — — Others 106,514 174,862 131,008 ￦ 187,792 269,562 221,556
Details of others of other losses	Details of others of other losses for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 2017 2018 In millions of won Losses on valuation of inventories ￦ 2,683 3,875 1,953 Losses on disposal of inventories 3,092 3,273 3,555 Losses due to disaster 1,522 5,374 2,129 Losses on rounding adjustment of electric charge surtax 1,260 1,253 1,265 Losses on adjustments of levies 1,184 1 — Forfeit of taxes and dues 4,582 656 — Losses on litigation 2,581 — — Others 102,405 77,953 54,997 ￦ 119,309 92,385 63,899

Finance Income (Tables)

Finance Income (Tables)	12 Months Ended
	Dec. 31, 2018
Finance income [Abstract]
Finance Income	2016 2017 2018 In millions of won Interest income ￦ 241,778 206,143 223,767 Dividends income 9,446 11,477 12,777 Gains on disposal of financial assets 1,482 1,130 1,838 Gains on valuation of Financial assets at fair value through profit or loss — 12 8,495 Gains on valuation of derivatives 293,830 16,165 199,943 Gains on transaction of derivatives 45,549 29,257 179,745 Gains on foreign currency translation 161,905 1,115,832 143,254 Gains on foreign currency transaction 37,553 150,602 27,051 ￦ 791,543 1,530,618 796,870
Interest Income	Interest income included in finance income for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 2017 2018 In millions of won Cash and cash equivalents ￦ 61,380 35,474 40,704 Financial assets at fair value through profit or loss — 290 21,713 Financial assets at amortized cost — — 89 Held-to-maturity 97 82 — Loans 25,106 30,014 21,925 Short-term financial instrument 45,763 29,412 41,025 Long-term financial instrument 7,195 8,144 7,920 Other financial assets — — 1 Trade and other receivables 102,237 102,727 90,390 ￦ 241,778 206,143 223,767

Finance Expenses (Tables)

Finance Expenses (Tables)	12 Months Ended
	Dec. 31, 2018
Finance Expenses [Abstract]
Finance Expenses	Finance expenses for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 2017 2018 In millions of won Interest expense ￦ 1,752,868 1,789,552 1,868,458 Losses on sale of financial assets 9 2,343 1 Losses on valuation of financial assets at fair value through profit or loss — — 6,616 Impairment of available-for-sale 86,703 2,713 — Losses on valuation of derivatives 5,762 890,832 46,740 Losses on transaction of derivatives 101,987 198,218 32,448 Losses on foreign currency translation 406,849 207,944 393,859 Losses on foreign currency transaction 57,889 35,175 121,763 Losses on repayment of financial liabilities 23,000 5 — Other 2,020 1,170 858 ￦ 2,437,087 3,127,952 2,470,743
Interest Expenses	Interest expense included in finance expenses for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 2017 2018 In millions of won Trade and other payables ￦ 68,375 57,160 42,830 Short-term borrowings 6,969 35,891 32,545 Long-term borrowings 91,584 87,011 92,243 Debt securities 1,922,900 1,698,232 1,771,544 Other financial liabilities 482,428 491,665 505,112 2,572,256 2,369,959 2,444,274 Less: Capitalized borrowing costs (819,388 ) (580,407 ) (575,816 ) ￦ 1,752,868 1,789,552 1,868,458 Capitalization rates for the years ended December 31, 2016, 2017 and 2018 are 2.29%~4.16%, 2.30%~3.60% and 2.17%~3.86%, respectively.

Income tax expense (Tables)

Income tax expense (Tables)	12 Months Ended
	Dec. 31, 2018
Income tax expense (benefit) [Abstract]
Income tax expense	Income tax expense (benefit) for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 2017 2018 In millions of won Current income tax expense Payment of income tax ￦ 2,689,640 881,583 378,715 Adjustment in respect of prior years due to change in estimate 231,113 4,484 (195,648 ) Current income tax directly recognized in equity 30,059 (56,098 ) 101,528 Effect of change in accounting policy — — 1,780 2,950,812 829,969 286,375 Deferred income tax expense Generation and realization of temporary differences 509,762 1,283,012 (495,658 ) Changes of unrecognized tax losses, tax credit and temporary differences for prior periods (86,845 ) 44,573 (28,509 ) Changes in deferred tax on tax losses carryforwards — — (572,305 ) Tax credit carryforwards (8,588 ) 15,270 (16,224 ) 414,329 1,342,855 (1,112,696 ) Income tax expense (benefit) ￦ 3,365,141 2,172,824 (826,321 )
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, 2016, 2017 and 2018 are as follows: 2016 2017 2018 In millions of won Income (loss) before income tax ￦ 10,513,468 3,614,218 (2,000,819 ) Income tax expense (benefit) computed at applicable tax rate(*1) 2,544,259 874,641 (550,225 ) Adjustments Effect of applying gradual tax rate (5,082 ) (5,082 ) (1,408 ) Effect of non-taxable (29,554 ) (32,032 ) (1,705 ) Effect of non-deductible 22,258 15,032 40,151 Effect of tax losses that are not recognized as deferred tax asset — — 2,086 Effects of tax credits and deduction (194,731 ) (161,069 ) (39,471 ) Recognition (reversal) of unrecognized deferred tax asset, net (86,845 ) 44,573 (28,509 ) Effect of change in deferred tax due to change in tax rate — 1,055,154 261 Deferred income tax related to investments in subsidiaries and associates 862,956 394,145 (52,618 ) Others, net 20,767 (17,022 ) 765 589,769 1,293,699 (80,448 ) Adjustment in respect of prior years due to change in estimate 231,113 4,484 (195,648 ) Income tax expense (benefit) ￦ 3,365,141 2,172,824 (826,321 ) Effective tax rate 32 % 60 % (*2 ) (*1) Applicable tax rate is 24.2% as of December 31, 2016 and 2017, and 27.5% as of December 31, 2018. (*2) The effective tax rate for the year ended December 31, 2018 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, 2016, 2017 and 2018 are as follows: 2016 2017 2018 In millions of won Dividends of hybrid bond ￦ 5,253 5,248 4,273 Gain on disposal of investments in subsidiaries (7,006 ) — — Effect of change in effective tax rate — (25 ) — ￦ (1,753 ) 5,223 4,273
Income tax recognized as other comprehensive income (loss)	Income tax recognized as other comprehensive income (loss) for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 2017 2018 In millions of won Income tax recognized as other comprehensive income (loss) Gain on valuation of financial assets at fair value through other comprehensive income ￦ — — 35,798 Loss on valuation of available-for-sale (8,143 ) (2,551 ) — Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax (18,335 ) (11,016 ) 6,639 Remeasurement of defined benefit obligations 49,986 (80,645 ) 53,703 Investments in associates 7,731 8,649 6,592 Others 573 24,242 (5,477 ) ￦ 31,812 (61,321 ) 97,255
Changes in deferred income tax assets (liabilities)	Changes in deferred income tax assets (liabilities) recognized in the statements of financial position for the years ended December 31, 2017 and 2018 are as follows: 2017 Beginning balance Amounts Amount Amounts recognized directly in equity Ending balance In millions of won Deferred income tax on temporary differences Employee benefits ￦ 493,331 86,008 (80,645 ) — 498,694 Cash flow hedge (53,583 ) 130,044 (11,016 ) — 65,445 Investments in associates or subsidiaries (7,166,345 ) (1,510,295 ) 8,649 (25 ) (8,668,016 ) Property, plant and equipment (5,527,318 ) (1,333,122 ) — — (6,860,440 ) Finance lease (345,431 ) (81,518 ) — — (426,949 ) Intangible assets 8,987 (1,339 ) — — 7,648 Financial assets at fair value through profit or loss (62 ) 952 — — 890 Available-for-sale (68,347 ) 62,055 (2,551 ) — (8,843 ) Deferred revenue 213,859 16,852 — — 230,711 Provisions 3,583,371 1,239,462 — — 4,822,833 Doubtful receivables 2,696 (2,637 ) — — 59 Other finance liabilities 30,249 (2,742 ) — 5,248 32,755 Gains or losses on foreign exchange translation 138,938 (140,292 ) — — (1,354 ) Allowance for doubtful accounts 17,252 25,679 — — 42,931 Accrued income (5,367 ) 3,542 — — (1,825 ) Special deduction for property, plant and equipment (194,309 ) (6,618 ) — — (200,927 ) Reserve for research and human development (12,883 ) 9,842 — — (3,041 ) Others 695,870 232,642 24,242 — 952,754 (8,189,092 ) (1,271,485 ) (61,321 ) 5,223 (9,516,675 ) Deferred income tax on unused tax losses and tax credit Tax losses — — — — — Tax credit 35,703 (15,272 ) — — 20,431 35,703 (15,272 ) — — 20,431 ￦ (8,153,389 ) (1,286,757 ) (61,321 ) 5,223 (9,496,244 ) 2018 Beginning balance Amounts Amount Amounts recognized directly in equity Ending balance In millions of won Deferred income 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 income 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 )
Deferred income tax assets (liabilities)	Deferred income tax assets (liabilities) recognized in the statements of financial position as of December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Deferred income tax assets ￦ 919,153 1,233,761 Deferred income tax liabilities (10,415,397 ) (9,617,309 ) ￦ (9,496,244 ) (8,383,548 )
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 income tax assets were recognized as of December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Deductible temporary differences ￦ 444,426 442,391

Assets Held-for-Sale (Tables)

Assets Held-for-Sale (Tables)	12 Months Ended
	Dec. 31, 2018
Assets Held-for-Sale [Abstract]
Assets Held-for-Sale	Assets held-for-sale 2017 2018 In millions of won Land(*1) ￦ 2,765 2,765 Building(*1) 19,369 19,369 Investments in associates(*2, 3, 4) 5,837 — Investments in subsidiaries(*5) — 747 ￦ 27,971 22,881 (*1) The board of directors of KEPCO Engineering & Construction Company, Inc., a subsidiary of the Company, determined to dispose the office building in Yongin as part of the government’s plan to relocate state-run held-for-sale. (*2) Korea Western Power Co., Ltd., a subsidiary of the Company, planned to dispose certain portion of its investment in Dongducheon Dream Power Co., Ltd. and had classified the relevant book value as non-current held-for-sale. (*3) Korea Hydro & Nuclear Power Co., Ltd., a subsidiary of the Company, initiated efforts to sell its shares in Yeongwol Energy Station Co., Ltd. during the year ended December 31, 2016, and sold its shares in Yeongwol Energy Station Co. during the year ended December 31, 2018. (*4) KEPCO Engineering & Construction Company, Inc., a subsidiary of the Company, exercised a put option to sell the shares of DS POWER Co., Ltd. on December 11, 2017 and the shares were sold on February 28, 2018. (*5) KOWEPO India Private Limited was in the process of liquidating its business as of December 31, 2018 and has been reclassified to assets held-for-sale,

Expenses Classified by Nature (

Expenses Classified by Nature (Tables)	12 Months Ended
	Dec. 31, 2018
Expenses Classified by Nature [Abstract]
Expenses Classified by Nature	Expenses classified by nature for the years ended December 31, 2016, 2017 and 2018 are as follows: 2016 Selling and Cost of sales Total In millions of won Raw materials used ￦ — 13,470,586 13,470,586 Salaries 734,930 3,425,712 4,160,642 Retirement benefit expense 72,812 374,826 447,638 Welfare and benefit expense 162,243 507,691 669,934 Insurance expense 11,513 79,987 91,500 Depreciation 169,431 8,704,525 8,873,956 Amortization of intangible assets 35,171 44,544 79,715 Bad debt expense 38,719 — 38,719 Commission 605,879 423,179 1,029,058 Advertising expense 34,658 9,693 44,351 Training expense 6,314 13,347 19,661 Vehicle maintenance expense 10,390 7,016 17,406 Publishing expense 3,643 4,615 8,258 Business promotion expense 3,477 4,836 8,313 Rent expense 40,020 133,670 173,690 Telecommunication expense 25,448 75,925 101,373 Transportation expense 596 5,153 5,749 Taxes and dues 46,531 464,962 511,493 Expendable supplies expense 6,834 34,668 41,502 Water, light and heating expense 9,720 25,820 35,540 Repairs and maintenance expense 75,122 1,896,656 1,971,778 Ordinary development expense 188,063 517,441 705,504 Travel expense 16,115 63,611 79,726 Clothing expense 8,273 5,363 13,636 Survey and analysis expense 666 3,209 3,875 Membership fee 1,132 8,714 9,846 Power purchase — 10,755,739 10,755,739 Others 331,532 4,488,065 4,819,597 ￦ 2,639,232 45,549,553 48,188,785 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

Earnings per share (Tables)

Earnings per share (Tables)	12 Months Ended
	Dec. 31, 2018
Earnings per share [Abstract]
Basic earnings per share	Basic earnings (loss) per share for the years ended December 31, 2016, 2017 and 2018 are as follows: Type 2016 2017 2018 In won Basic earnings (loss) per share ￦ 10,980 2,023 (2,048 )
Diluted earnings per share	Diluted earnings (loss) per share for the years ended December 31, 2016, 2017 and 2018 are as follows: Type 2016 2017 2018 In won Diluted earnings (loss) per share ￦ 10,980 2,023 (2,048 )
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, 2016, 2017 and 2018 are as follows: Type 2016 2017 2018 In millions of won except number of shares Net profit (loss) attributable to controlling interest ￦ 7,048,581 1,298,720 (1,314,567 ) Profit (loss) used in the calculation of total basic earnings (loss) per share 7,048,581 1,298,720 (1,314,567 ) 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, 2016, 2017 and 2018 are as follows: Type 2016 2017 2018 In millions of won Profit (loss) used in the calculation of total diluted earnings (loss) per share ￦ 7,048,581 1,298,720 (1,314,567 ) 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, 2016, 2017 and 2018 are as follows: Type 2016 2017 2018 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, 2018
Risk Management [Abstract]
Capital risk management	Details of the Company’s capital management accounts as of December 31, 2017 and 2018 are as follows: 2017 2018 In millions of won Total borrowings and debt securities ￦ 54,747,392 61,034,627 Cash and cash equivalents 2,369,739 1,358,345 Net borrowings and debt securities 52,377,653 59,676,282 Total shareholder’s equity 72,964,641 71,092,762 Debt to equity ratio 71.78 % 83.94 %
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, 2017 and 2018 are as follows: 2017 2018 In millions of won Cash and cash equivalents ￦ 2,369,739 1,358,345 Financial assets at fair value through profit or loss — 920,935 Financial assets at fair value through profit or loss 111,512 — Derivative assets (trading) 22,020 37,631 Equity investment at fair value through other comprehensive income — 399,495 Available-for-sale 699,833 — Financial assets at amortized cost — 14,042 Held-to-maturity 3,144 — Loans 905,641 718,674 Long-term/short-term financial instruments 2,244,514 2,318,027 Derivative assets (applying hedge accounting) 10,606 64,704 Trade and other receivables 9,683,769 9,613,437 Financial guarantee contracts(*) 1,154,862 1,310,817 (*) 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
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, 2017 and 2018 are as follows: 2017 2018 Type Accounts 1% Increase 1% Decrease 1% Increase 1% Decrease In millions of won Future salary increases Increase (decrease) in defined benefit obligation ￦ 354,852 (305,494 ) 416,956 (363,820 ) Discount rate Increase (decrease) in defined benefit obligation (313,597 ) 377,148 (377,221 ) 445,833 Changes of employee benefits assuming a 1% increase and decrease movements in discount rate on plan asset for the years ended December 31, 2017 and 2018 are ￦8,926 million and ￦14,646 million, respectively.
Changes in provisions due to movements in underlying assumptions	Changes in provisions due to movements in underlying assumptions as of December 31, 2017 and 2018 are as follows: Type Accounts 2017 2018 PCBs Inflation rate 1.23 % 1.27 % Discount rate 2.55 % 2.18 % Nuclear plants Inflation rate 1.21 % 1.21 % Discount rate 2.94 % 2.94 % 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, 2017 and 2018 are as follows: 2017 2018 Type Accounts 0.1% Increase 0.1% Decrease 0.1% Increase 0.1% Decrease In millions of won Discount rate PCBs ￦ (811 ) 816 (623 ) 627 Nuclear plants (262,949 ) 270,370 (256,513 ) 263,595 Spent fuel (51,015 ) 52,997 (49,182 ) 51,098 Inflation rate PCBs 826 (822 ) 632 (629 ) Nuclear plants 287,926 (280,249 ) 294,984 (287,110 ) Spent fuel 53,763 (51,823 ) 51,837 (49,961 )
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, 2017 and 2018 are as follows: Assets Liabilities Type 2017 2018 2017 2018 In thousands of foreign currencies AED 5,693 10,513 2,049 5,890 AUD 145 143 652,259 717,712 BDT 60,208 71,575 1,001 1,175 BWP 797 1,214 — — CAD 82 96 171 4 CHF — — 400,004 400,000 CNY 13,007 — 26,140 26,140 EUR 5,708 337 68,003 105,673 GBP 3 — 2,327 1 HKD — — — 1,650,000 IDR 167,775 60,568 — 206,935 INR 1,228,259 1,228,795 227,078 183,963 JOD 1,624 2,764 5 5 JPY 799,501 35,935 21,624,128 390,921 KZT 359 319 — — MGA 2,762,572 3,318,447 319,581 170,641 NOK — — 482 — PHP 189,261 709,285 125,431 66,985 PKR 251,190 305,542 4,676 3,588 SAR 1,191 2,024 44 — SEK — — 449,002 450,000 USD 1,653,858 1,422,510 8,321,335 8,103,602 UYU 12,955 39,898 10,586 4,253 ZAR 361 170 4 4 MMK — 25,208 — — GHS — 25,794 — —
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, 2017 and 2018 are as follows: 2017 2018 Type 10% Increase 10% Decrease 10% Increase 10% Decrease In millions of won Increase (decrease) of profit before ￦ (844,122 ) 844,122 (887,561 ) 887,561 Increase (decrease) of shareholder’s (844,122 ) 844,122 (887,561 ) 887,561 (*) 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, 2017 and 2018 are as follows: Type 2017 2018 In millions of won Short-term borrowings ￦ 290,873 24,235 Long-term borrowings 1,743,252 2,358,860 Debt securities 685,700 — ￦ 2,719,825 2,383,095
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, 2017 and 2018 are as follows: 2017 2018 Type 1% Increase 1% Decrease 1% Increase 1% Decrease In millions of won Increase (decrease) of profit before income tax ￦ (27,198 ) 27,198 (23,831 ) 23,831 Increase (decrease) of shareholder’s equity(*) (27,198 ) 27,198 (23,831 ) 23,831 (*) 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, 2017 and 2018 are as follows: 2017 2018 Type 1% Increase 1% Decrease 1% Increase 1% Decrease In millions of won Increase (decrease) of profit before income tax ￦ 546,499 (546,499 ) 568,420 (568,420 ) Increase (decrease) of shareholder’s equity(*) 546,499 (546,499 ) 568,420 (568,420 ) (*) 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 2017 Type Less than 1 year 1~2 Years 2~5 Years More than 5 years Total In millions of won Borrowings and debt securities ￦ 10,748,437 7,948,320 21,331,394 22,694,867 62,723,018 Finance lease liabilities 174,534 87,709 185,284 108,749 556,276 Trade and other payables 5,867,729 301,165 698,289 1,937,558 8,804,741 Financial guarantee contracts(*) 7,081 18,054 1,049,667 80,060 1,154,862 ￦ 16,797,781 8,355,248 23,264,634 24,821,234 73,238,897 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 (*) This represents the total guarantee amounts associated with the financial guarantee contracts. Financial guarantee liabilities which are recognized as of December 31, 2017 and 2018 are ￦23,475 million and ￦15,586 million, respectively.
The expected maturities for non-derivative financial assets	The expected maturities for non-derivative 2017 Type Less than 1 year 1~5 Years More than 5 years Other(*) Total In millions of won Cash and cash equivalents ￦ 2,369,739 — — — 2,369,739 Available-for-sale — — 214,156 485,677 699,833 Held-to-maturity 5 3,139 — — 3,144 Loans 244,309 261,672 429,628 10,821 946,430 Long-term/short-term financial instruments 1,702,084 201,821 340,304 305 2,244,514 Financial assets at fair value through profit or loss — — 111,512 — 111,512 Trade and other receivables 7,930,715 920,539 788,795 52,031 9,692,080 ￦ 12,246,852 1,387,171 1,884,395 548,834 16,067,252 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 Equity investment 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 (*) 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 date of contract as of December 31, 2017 and 2018 are as follows: 2017 Type Less than 1 year 1~2 Years 2~5 Years More than 5 years Total In millions of won Net settlement —Trading ￦ (774 ) — — — (774 ) Gross settlement —Trading (51,496 ) (19,887 ) (16,597 ) (4,967 ) (92,947 ) —Hedging (17,547 ) (28,977 ) (192,205 ) (44,137 ) (282,866 ) ￦ (69,817 ) (48,864 ) (208,802 ) (49,104 ) (376,587 ) 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
Fair value and book value of financial assets and liabilities	Fair value and book value of financial assets and liabilities as of December 31, 2017 and 2018 are as follows: 2017 2018 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 Available-for-sale 699,833 699,833 — — Derivative assets (trading) 22,020 22,020 37,631 37,631 Derivative assets (applying hedge accounting) 10,606 10,606 64,704 64,704 Long-term financial instruments 542,430 542,430 — — Short-term financial instruments 1,702,084 1,702,084 — — Financial assets at fair value through profit or loss — — 920,935 920,935 Financial assets at fair value through profit or loss 111,512 111,512 — — ￦ 3,088,485 3,088,485 1,422,765 1,422,765 Assets carried at amortized cost Financial assets at amortized cost ￦ — — 14,042 14,042 Held-to-maturity 3,144 3,144 — — Loans and receivables 905,641 905,641 718,674 718,674 Long-term financial instruments — — 448,741 448,741 Short-term financial instruments — — 1,869,286 1,869,286 Trade and other receivables 9,683,769 9,683,769 9,613,437 9,613,437 Cash and cash equivalents 2,369,739 2,369,739 1,358,345 1,358,345 ￦ 12,962,293 12,962,293 14,022,525 14,022,525 Liabilities recognized at fair value Derivative liabilities (trading) ￦ 150,929 150,929 99,010 99,010 Derivative liabilities (applying hedge accounting) 277,130 277,130 213,153 213,153 ￦ 428,059 428,059 312,163 312,163 Liabilities carried at amortized cost Secured borrowings ￦ 1,055,554 1,055,554 741,029 741,029 Unsecured bond 51,146,783 53,436,659 56,603,988 58,804,070 Finance lease liabilities 418,260 418,260 283,806 283,806 Unsecured borrowings 2,476,196 2,477,055 3,522,602 3,950,517 Trade and other payables(*2) 8,804,741 8,804,741 9,063,285 9,063,285 Bank overdraft 68,859 68,859 167,008 167,008 ￦ 63,970,393 66,261,128 70,381,718 73,009,715 (*1) Book value of equity securities held by the Company that were measured at cost as of December 31, 2017 is ￦37,926 million as a quoted market price does not exist in an active market and its fair value cannot be measured reliably. (*2) Excludes finance lease liabilities.
Interest rates used for determining fair value	The discount rate used for calculating fair value as of December 31, 2017 and 2018 are as follows: Type 2017 2018 Derivatives 0.03% ~ 4.16% 0.02% ~ 4.16% Borrowings and debt securities 0.08% ~ 4.38% 0.51% ~ 5.14% Finance lease 9.00% ~ 10.83% 3.50% ~ 10.83%
Fair value hierarchy	Fair values of financial instruments by hierarchy level as of December 31, 2017 and 2018 are as follows: 2017 Type Level 1 Level 2 Level 3 Total In millions of won Financial assets at fair value Available-for-sale ￦ 274,453 214,156 173,298 661,907 Derivative assets — 18,466 14,160 32,626 Financial assets at fair value through profit or loss — 111,512 — 111,512 ￦ 274,453 344,134 187,458 806,045 Financial liabilities at fair value Derivative liabilities ￦ — 428,059 — 428,059 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
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, 2017 and 2018 are as follows: 2017 Beginning Acquisition Reclassified Valuation Disposal Foreign Ending In millions of won Financial assets at fair value Available-for-sale Unlisted securities ￦ 269,461 — (92,128 ) (6,201 ) — 2,166 173,298 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 value through other comprehensive income Unlisted securities — 197,450 — — (11,744 ) (326 ) 4,059 189,439

Service Concession Arrangemen_2

Service Concession Arrangements (Tables)	12 Months Ended
	Dec. 31, 2018
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, 2018 are as follows: Type Amounts In millions of won Less than 1 year ￦ 116,790 1~ 2 years 116,790 2~ 3 years 116,790 Over 3 years 48,663 ￦ 399,033
Hydroelectric Power Generation at Semangka, Indonesia	The Company’s expected future collections of service concession arrangements as of December 31, 2018 are as follows: Type Amounts In millions of won Less than 1 year ￦ 27,803 1~ 2 years 27,929 2~ 3 years 27,863 Over 3 years 595,706 ￦ 679,301

Related parties (Tables)

Related parties (Tables)	12 Months Ended
	Dec. 31, 2018
Related Parties [Abstract]
Related Party Transactions	Related party transactions for the years ended December 31, 2016, 2017 and 2018 are as follows: <Sales and Others> Sales and others Company name Transaction type 2016 2017 2018 In millions of won <Associates> Dongducheon Dream Power Co., Ltd. Electricity sales ￦ 15,221 17,041 6,093 Korea Gas Corporation Electricity sales 89,030 88,011 99,933 Daegu Photovoltaic Co., Ltd. Electricity sales — 349 128 Jeongam Wind Power Co., Ltd. Electricity sales 6 30 724 Korea Power Engineering Service Co., Ltd. Service 1,455 1,317 840 KS Solar Co., Ltd. Electricity sales 20 5 — Heang Bok Do Si Photovoltaic Power Co., Ltd. Electricity sales 2 2 2 Korea Electric Power Industrial Development Co., Ltd. Service 10,723 14,044 10,422 Goseong Green Energy Co., Ltd. Electricity sales 9,195 24,069 10,024 Gangneung Eco Power Co., Ltd. Service 5,223 2,391 4,928 Shin Pyeongtaek Power Co., Ltd. Electricity sales 3,579 9,025 8,468 Naepo Green Energy Co., Ltd. Electricity sales 104 185 160 Noeul Green Energy Co., Ltd. Electricity sales 177 32 30 Samcheok Eco Materials Co., Ltd. Electricity sales 64 237 605 YTN Co., Ltd. Electricity sales 1,785 1,987 2,043 Busan Green Energy Co., Ltd. Electricity sales 133 120 19 Gunsan Bio Energy Co., Ltd. Electricity sales 6 — 3,611 Korea Electric Vehicle Charging Service Electricity sales 89 700 578 Ulleungdo Natural Energy Co., Ltd. Service 691 1,013 292 Tamra Offshore Wind Power Co., Ltd. Electricity sales 12 55 58 Daegu clean Energy Co., Ltd. Electricity sales — 421 126 Cheongna Energy Co., Ltd. Service 6,831 7,980 11,688 Gangwon Wind Power Co., Ltd. Electricity sales 1,273 994 2,402 Gwangyang Green Energy Co., Ltd. Electricity sales — — 874 Hyundai Green Power Co., Ltd. Design service 14,835 14,280 14,031 Korea Power Exchange Service 7,141 8,446 6,854 Hyundai Energy Co., Ltd. Service 24,719 15,627 1,718 Taebaek Wind Power Co., Ltd. Service 796 813 614 Pyeongchang Wind Power Co., Ltd. Design service 497 1,176 1,166 Daeryun Power Co., Ltd. Electricity sales 1,516 1,796 1,731 Changjuk Wind Power Co., Ltd. Electricity sales 863 788 758 KNH Solar Co., Ltd. Electricity sales 17 17 17 S-Power Service ￦ 5,994 12,852 9,118 PND solar., Ltd Electricity sales — — 12 Busan Solar Co., Ltd. Electricity sales 8 — — Green Biomass Co., Ltd. Electricity sales 2 — — SPC Power Corporation Dividend income 8,346 5,562 9,549 Gemeng International Energy Co., Ltd. Dividend income 16,476 13,365 11,246 PT. Cirebon Electric Power Dividend income — 550 4,432 Dolphin Property Limited Dividend income 35 — — PT. Bayan Resources TBK Service 160 717 33,817 Nepal Water & Energy Development Company Private Limited Service 375 900 536 Pioneer Gas Power Limited Rental income and others 164 62 26 Xe-Pian Xe-Namnoy Service 773 661 672 PT. Mutiara Jawa Rental income and others — 47 40 <Joint ventures> Daegu Green Power Co., Ltd. Electricity sales 768 1,131 1,022 KEPCO SPC Power Corporation Service 10,344 45,005 43,141 Daejung Offshore Wind Power Co., Ltd. Electricity sales 1 1 1 KAPES, Inc. Commission 1,176 1,420 648 Dangjin Eco Power Co., Ltd. Technical fee 1,787 670 3,424 Honam Wind Power Co., Ltd. Electricity sales 169 552 415 Seokmun Energy Co., Ltd. Service 1,627 1,765 1,897 Incheon New Power Co., Ltd. Construction revenue 524 539 568 Chun-cheon Energy Co., Ltd. Electricity sales 3,079 4,855 2,471 Yeonggwangbaeksu Wind Power Co., Ltd. Electricity sales 1,591 1,654 1,540 Yeonggwang Wind Power Co., Ltd. Electricity sales — — 46 KW Nuclear Components Co., Ltd. Service 3,327 644 839 KEPCO-Uhde Inc. Service 6 34 17 GS Donghae Electric Power Co., Ltd. Electricity sales 12,994 11,204 7,238 Busan Shinho Solar Power Co., Ltd. Electricity sales 210 87 362 Datang Chifeng Renewable Power Co., Ltd. Interest income 8,216 500 19,013 Rabigh Electricity Company Service 699 19,179 29,167 Rabigh Operation & Maintenance Company Limited Service 2,395 2,784 1,707 Datang Chaoyang Renewable Power Co., Ltd. Dividend income — 839 — Shuweihat Asia Power Investment B.V. Dividend income 2,957 1,707 499 Shuweihat Asia Operation & Maintenance Company Service 1,179 1,319 1,046 ASM-BG Service 322 1,062 1,153 Jamaica Public Service Company Limited Service 1,905 — 5,160 KV Holdings, Inc. Dividend income 302 — 735 Datang KEPCO Chaoyang Renewable Co., Ltd. Dividend income 440 — — Amman Asia Electric Power Company Service 21,915 14,205 16,569 Kelar S.A Service 1,702 570 — Nghi Son 2 Power LLC Service — 2,693 25,880 Barakah One Company Service 25,244 7,059 7,777 Nawah Energy Company Service — 34,421 51,144 South Jamaica Power Company Limited Service — — 152 RE Holiday Holdings LLC Dividend income — — 112 RE Pioneer Holdings LLC Dividend income — — 979 RE Barren Ridge 1 Holdings LLC Dividend income — — 1,114 RE Astoria 2 LandCo LLC Dividend income — — 504 RE Barren Ridge LandCo LLC Dividend income — — 202 <Others> Yeongwol Energy Station Co., Ltd. Service 858 830 373 DS POWER Co., Ltd. Service 35,133 5,819 565 Korea Development Bank Electricity sales 3,102 3,239 3,524 Interest income 3,164 1,685 4,438 <Purchase and Others> Purchase and others Company name Transaction type 2016 2017 2018 In millions of won <Associates> Dongducheon Dream Power Co., Ltd. Electricity purchase ￦ 946,463 813,440 828,547 Korea Gas Corporation Purchase of power generation 3,633,198 3,245,519 5,191,243 Daegu Photovoltaic Co., Ltd. REC purchase 3,243 3,646 3,745 Korea Power Engineering Service Service 723 1,292 1,765 KS Solar Co., Ltd. REC purchase 4,080 900 — Heang Bok Do Si Photovoltaic Power Rental fee and others 410 570 455 Korea Electric Power Industrial Development Co., Ltd. Electricity metering service 250,057 289,293 261,668 Gangneung Eco Power Co., Ltd. Service — — 19 Noeul Green Energy Co., Ltd. Service — 15,862 18,282 Samcheok Eco Materials Co., Ltd. Electricity purchase — 14 3,819 YTN Co., Ltd. Advertisement fee 554 731 322 Busan Green Energy Co., Ltd. Service — 12,189 25,123 Korea Electric Vehicle Charging Service Service — 1,093 605 Ulleungdo Natural Energy Co., Ltd. Electricity purchase 60 119 63 Tamra Offshore Wind Power Co., Ltd. Electricity purchase — 2,105 8,371 Cheongna Energy Co., Ltd. Service 73 59 58 Gangwon Wind Power Co., Ltd. Electricity purchase 22,780 25,968 25,407 Hyundai Green Power Co., Ltd. Electricity purchase 469,547 458,378 480,815 Korea Power Exchange Trading Fees 91,433 207,855 137,489 Hyundai Energy Co., Ltd. Electricity purchase 1,313 87,607 3,445 Taebaek Wind Power Co., Ltd. REC purchase 5,741 6,534 8,582 Pyeongchang Wind Power Co., Ltd. Service 1,594 4,033 6,994 Daeryun Power Co., Ltd. Electricity purchase 244,023 146,189 184,063 Changjuk Wind Power Co., Ltd. Electricity purchase 5,786 6,981 7,929 KNH Solar Co., Ltd. Electricity purchase 4,006 3,947 3,586 S-Power Electricity purchase 437,206 457,329 507,875 Busan Solar Co., Ltd. Electricity purchase 1,079 — — Hadong Mineral Fiber Co., Ltd. Service — — 60 Green Biomass Co., Ltd. Woodchip purchase 2,232 1,345 440 YeongGwang Yaksu Wind Electric. Co., Ltd Electricity purchase — — 2,437 Nepal Water & Energy Development Company Private Limited Service — 72 31 <Joint ventures> Daegu Green Power Co., Ltd. Electricity purchase 263,797 252,024 287,008 KAPES, Inc. Service 140,555 164,165 77,758 Honam Wind Power Co., Ltd. Electricity purchase 6,776 5,962 7,700 Seokmun Energy Co., Ltd. REC purchase — 21,674 31,759 Chun-cheon Energy Co., Ltd. REC purchase — 194,136 320,954 Yeonggwangbaeksu Wind Power Co., Ltd. Electricity purchase 11,208 11,124 11,366 GS Donghae Electric Power Co., Ltd. Electricity purchase 903 351,367 780,233 Busan Shinho Solar Power Co., Ltd. REC purchase 6,770 7,984 7,901 Global Trade Of Power System Co., Ltd. Service 882 414 565 Expressway Solar-light Power Generation Co., Ltd. Electricity purchase 2,942 2,941 3,513 ASM-BG Service — — 1 Jamaica Public Service Company Limited Service 127 154 83 Barakah One Company Service — 2,631 1,145 South Jamaica Power Company Limited Service — — 67 <Others> Yeongwol Energy Station Co., Ltd. REC purchase 14,875 14,256 4,019 Korea Development Bank Interest expense 8,231 4,573 5,043 Dividend paid 654,829 418,407 166,876
Receivables and payables arising from related party transactions	Receivables and payables arising from related party transactions as of December 31, 2017 and 2018 are as follows: Receivables Payables Company name Type 2017 2018 2017 2018 In millions of won <Associates> Dongducheon Dream Power Co., Ltd. Trade receivables ￦ 2,230 332 — — Non-trade receivables and others 655 298 — — Trade payables — — 77,817 74,651 Non-trade — — — 10 Korea Gas Corporation Trade receivables 9,833 9,439 — — Non-trade 339 498 — — Trade payables — — 524,881 601,092 Non-trade — — 569 314 Daegu Photovoltaic Co., Ltd. Trade payables — — 71 83 Jeongam Wind Power Co., Ltd. Trade receivables — 151 — — Non-trade — — 4 2 Korea Electric Power Industrial Development Co., Ltd. Trade receivables 333 278 — — Non-trade 42 51 — — Non-trade — — 18,006 13,102 Goseong Green Energy Co., Ltd. Non-trade 19 — — — Non-trade — — 7,140 43,020 Gangneung Eco Power Co., Ltd. Trade receivables 1 1 — — Non-trade 4,747 99 — — Shin Pyeongtaek Power Co., Ltd. Trade receivables — 123 — — Non-trade 210 242 — — Non-trade — — 52 82 Naepo Green Energy Co., Ltd. Trade receivables 17 17 — — Noeul Green Energy Co., Ltd. Trade receivables 3 3 — — Non-trade — — 2,041 8,774 Samcheok Eco Materials Co., Ltd. Trade receivables 20 61 — — YTN Co., Ltd. Trade receivables 98 98 — — Non-trade — — 209 11 Busan Green Energy Co., Ltd. Trade receivables 7 1 — — Non-trade 1,691 — — — Non-trade — — — 10,882 Gunsan Bio Energy Co., Ltd. Non-trade — 3,458 — — Korea Electric Vehicle Charging Service Trade receivables 23 69 — — Non-trade — 354 — — Trade payables — — 45 — Non-trade — — — 56 Daegu Clean Energy Co., Ltd. Non-trade — 17 — — Cheongna Energy Co., Ltd. Trade receivables 182 183 — — Non-trade — — 1 — Gangwon Wind Power Co., Ltd. Trade receivables 6 10 — — Trade payables — — 3,033 2,547 Hyundai Green Power Co., Ltd. Trade receivables 946 390 — — Trade payables — — 32,589 38,072 Korea Power Exchange Trade receivables 463 847 — — Non-trade 128 229 — — Non-trade — — 1,142 1,214 Hyundai Energy Co., Ltd. Trade receivables ￦ 49 57 — — Non-trade 6,598 9,664 — — Trade payables — — 223 259 Non-trade — — 13,796 8,021 <Associates> Ecollite Co., Ltd. Non-trade receivables and others 210 210 — — Taebaek Wind Power Co., Ltd. Trade receivables 116 — — — Trade payables — — 533 453 Non-trade — — 121 291 Pyeongchang Wind Power Co., Ltd. Trade receivables 3 4 — — Non-trade — — 163 25 Daeryun Power Co., Ltd. Trade receivables 162 178 — — Trade payables — — 15,706 15,845 Changjuk Wind Power Co., Ltd. Trade receivables 101 — — — Trade payables — — 515 455 Non-trade — — 546 273 KNH Solar Co., Ltd. Trade receivables 1 1 — — Non-trade — — 193 — S-Power Trade receivables 117 922 — — Non-trade 5,183 34 — — Trade payables — — 25,061 56,897 Non-trade — — — 16 Green Biomass Co., Ltd. Non-trade — — 85 — PND solar., Ltd Trade receivables — 3 — — YeongGwang Yaksu Wind Electric. Co., Ltd Trade payables — — — 2,679 SPC Power Corporation Non-trade 76 73 — — Nepal Water & Energy Development Company Private Limited Non-trade 227 311 — — Xe-Pian Xe-Namnoy Non-trade 53 61 — — PT. Mutiara Jawa Non-trade — 10 — — <Joint ventures> Daegu Green Power Co., Ltd. Trade receivables 98 110 — — Non-trade 10 12 — — Trade payables — — 25,257 32,609 KAPES, Inc. Non-trade — 253 — — Trade payables — — 55 — Non-trade — — — 338 Dangjin Eco Power Co., Ltd. Non-trade 1,211 18 — — Non-trade — — 41 — Honam Wind Power Co., Ltd. Trade payables — — 381 432 Non-trade — — 3,013 3,573 Seokmun Energy Co., Ltd. Trade receivables 93 39 — — Non-trade 276 303 — — Non-trade — — 3,052 5,043 Incheon New Power Co., Ltd. Trade receivables ￦ 128 128 — — Chun-cheon Energy Co., Ltd. Trade receivables 129 20 — — Non-trade 252 308 — — Trade payables — — 29,676 33,796 <Joint ventures> Yeonggwangbaeksu Wind Power Trade receivables 7 7 — — Non-trade receivables and others 144 — — — Trade payables — — 619 736 Non-trade — — 1,300 789 Yeonggwang Wind Power Trade receivables — 10 — — KW Nuclear Components Trade receivables 4 4 — — Non-trade — 31 — — KEPCO-Uhde Inc. Non-trade — — 4 4 GS Donghae Electric Power Trade receivables 450 245 — — Non-trade 1,892 2,537 — — Trade payables — — 73,570 69,820 Non-trade — — — 59 Busan Shinho Solar Power Trade receivables 2 2 — — Trade payables — — 159 175 Non-trade — — 811 717 Datang Chifeng Renewable Power Co., Ltd. Non-trade 82 — — — Rabigh Operation & Maintenance Company Limited Non-trade 869 449 — — ASM-BG Non-trade 37 38 — — Jamaica Public Service Company Limited Trade receivables — 594 — — Non-trade — — — 24 Amman Asia Electric Power Company Trade receivables 2,675 — — — Non-trade — — — 18,351 Nawah Energy Company Trade receivables 10,419 29,614 — — Non-trade — 253 — — <Others> Yeongwol Energy Station Trade receivables 7,068 — — — DS POWER Co., Ltd. Trade receivables 340 — — — Korea Development Bank Accrued interest income 204 1,147 — — Non-trade 501,029 12,125 — — Non-trade — — 200 218 Derivatives 569 27,306 22,398 18,095
Loans and others arising from related party transactions	Loans and others arising from related party transactions as of December 31, 2017 and 2018 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. ￦ 26,341 229 — 1,064 27,634 (Allowance for doubtful accounts) (16,551 ) — 4,072 6,414 (6,065 ) Associates PT. Cirebon Electric Power 15,436 1,283 (8,522 ) 499 8,696 Associates Xe-Pian Xe-Namnoy 1,413 — — — 1,413 Associates PT Wampu Electric Power 13,288 970 — 622 14,880 Associates Gunsan Bio Energy Co., Ltd. 9,396 — — — 9,396 Associates Hyundai Energy Co., Ltd. 2,465 — — — 2,465 (Allowance for doubtful accounts) (2,465 ) — — — (2,465 ) Joint ventures KEPCO SPC Power Corporation 17,249 — (17,715 ) 466 — Joint ventures Datang Chifeng Renewable Power Co., Ltd. 7,245 — (7,440 ) 195 — Joint ventures Nghi Son 2 Power LLC — 4,566 (4,566 ) — — Joint ventures KODE NOVUS II LLC (*) 4,018 — — (4,018 ) — (Allowance for doubtful accounts) (*) (4,018 ) — — 4,018 — Joint ventures Kelar S.A 46,620 — — 2,074 48,694 Joint ventures Daehan Wind Power PSC 1,211 — (606 ) (605 ) — Joint ventures Chester Solar IV SpA 4,607 — (4,607 ) — — Joint ventures Chun-cheon Energy Co., Ltd. — 616 — — 616 ￦ 126,255 7,664 (39,384 ) 10,729 105,264 (*) The loans of KODE NOVUS II LLC is eliminated because the Company sold all of its shares of KODE NOVUS II LLC during the year ended December 31, 2018 as described in note 20.
Borrowings arising from related party transactions	Borrowings arising from related party transactions as of December 31, 2017 and 2018 are as follows: Related parties Type Beginning balance Borrowings Repayment Others Ending balance In millions of won Korea Development Bank Facility ￦ 93,883 1,200 (28,290 ) — 66,793 Others 4,909 — (755 ) — 4,154 Operating funds 61,000 32,000 (12,000 ) — 81,000 Syndicated Loan 16,301 — (125 ) 1,100 17,276
Guarantees provided to associates or joint ventures	Guarantees provided to associates or joint ventures as of December 31, 2018 are as follows: Primary guarantor Principal obligor Type of guarantees Credit limit Guarantee In millions of won and thousands of foreign currencies Korea Electric Power Corporation Shuweihat Asia Operation & Maintenance Company Performance guarantees USD 11,000 SAPCO Korea Electric Power Corporation Rabigh Operation & Maintenance Company Limited Performance guarantees and others USD 1,387 RABEC Korea Electric Power Corporation Barakah One Company Debt guarantees USD 900,000 Export-Import Bank of Korea and others Performance guarantees and others USD 3,404,275 Export-Import Bank of Korea and others 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 Firstar Development, LLC, Santander Bank and others Korea Electric Power Corporation Nghi Son 2 Power LLC Performance guarantees USD 28,000 SMBC Ho Chi Minh Korea Western Power Co., Ltd. Cheongna Energy Co., Ltd. Collateralized money invested KRW 3,465 KEB Hana Bank and others Guarantees for supplemental funding and others(*1) — KEB Hana Bank and others Korea Western Power Co., Ltd. Xe-Pian Xe-Namnoy Payment guarantees for business reserve USD 2,500 Krung Thai Bank Collateralized money invested KRW 77,165 Krung Thai Bank 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 2,002 Korea Development Bank Korea Western Power Co., Ltd. Dongducheon Dream Power Co., Ltd. Collateralized money invested(*7) KRW 41,389 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 365 Woori Bank Korea Western Power Co., Ltd. Heang Bok Do Si Photovoltaic Power Co., Ltd. Collateralized money invested KRW 202 Nonghyup Bank Korea Western Power Co., Ltd. Shin Pyeongtaek Power Co., Ltd. Collateralized money invested KRW 67,600 Kookmin Bank Guarantees for supplemental funding(*1) — Kookmin Bank Korea East-West Power Co., Ltd. Busan Shinho Solar Power Co., Ltd. Collateralized money invested KRW 4,761 Korea Development Bank and others Korea East-West Power Co., Ltd. Seokmun Energy Co., Ltd. Collateralized money invested KRW 16,751 Kookmin Bank and others Korea East-West Power Co., Ltd. Chun-cheon Energy Co., Ltd. Collateralized money invested KRW 42,505 Kookmin Bank and others Guarantees for supplemental funding(*1) KRW 20,000 Kookmin Bank and others Korea East-West Power Co., Ltd. Honam Wind Power Co., Ltd. Collateralized money invested KRW 4,860 Shinhan Bank and others Korea East-West Power Co., Ltd. GS Donghae Electric Power Co., Ltd. Collateralized money invested KRW 240,591 Korea Development Bank and others Korea East-West Power Co., Ltd. Yeonggwangbaeksu Wind Power Co., Ltd. Collateralized money invested KRW 2,843 Kookmin Bank and others Korea East-West Power Co., Ltd. Yeonggwang Wind Power Co., Ltd. Collateralized money invested KRW 15,304 KDB Capital Corporation and others Korea East-West Power Co., Ltd. Daesan Green Energy Co., Ltd. Collateralized money invested KRW 17,433 IBK Korea East-West Power Co., Ltd. Taebaek Gadeoksan Wind Power Co., Ltd. Collateralized money invested KRW 8,508 Samsung Fire & Marine Insurance Co., Ltd. and others Korea East-West Power Co., Ltd. PT. Tanjung Power Indonesia Debt guarantees USD 46,983 MUFG Bank, Ltd.(MUFG) (formerly, the Bank of Tokyo Mitsubishi UFJ, Ltd.(BTMU)) and others Other guarantees USD 3,150 PT Adaro Indonesia Korea East-West Power Co., Ltd. South Jamaica Power Company Limited Performance guarantees USD 14,400 Societe Generale EWP Barbados 1 SRL South Jamaica Power Company Limited Guarantees for supplemental funding(*1, 3) USD 18,350 JCSD Trustee Services Limited and others Korea Southern Power Co., Ltd. KNH Solar Co., Ltd. Collateralized money invested KRW 2,337 Shinhan Bank and Kyobo Performance guarantees and guarantees for supplemental funding(*1) — Life Insurance Co., Ltd. Korea Southern Power Co., Ltd. Daeryun Power Co., Ltd. Collateralized money invested KRW 26,099 Korea Development Bank and others Guarantees for supplemental funding and others(*1) — Korea Development Bank and others Korea Southern Power Co., Ltd. Changjuk Wind Power Co., Ltd. Collateralized money invested KRW 8,086 Shinhan Bank Guarantees for supplemental funding(*1) — Shinhan Bank Korea Southern Power Co., Ltd. Daegu Green Power Co., Ltd. Collateralized money invested KRW 41,110 Shinhan Bank and others Korea Southern Power Co., Ltd. Kelar S.A Performance guarantees USD 63,707 KEB Hana Bank, SMBC, Mizuho Bank, MUFG, Natixis Korea Southern Power Co., Ltd. Daehan Wind Power PSC Debt guarantees USD 18,200 Shinhan Bank Performance guarantees USD 3,000 Shinhan Bank Guarantees for supplemental funding(*1) — Shinhan Bank Korea Southern Power Co., Ltd. Pyeongchang Wind Power Co., Ltd. Collateralized money invested KRW 5,419 Woori Bank and Shinhan Bank and others Performance guarantees — Woori Bank and Shinhan Bank and others Korea Southern Power Co., Ltd. Taebaek Wind Power Co., Ltd. Guarantees for supplemental funding(*1) — Shinhan Bank and others Korea Southern Power Co., Ltd. Jeongam Wind Power Co., Ltd. Collateralized money invested KRW 4,589 IBK, SK Securities Co., Ltd. and others Performance guarantees — IBK, SK Securities Co., Ltd. and others Korea Southern Power Co., Ltd. Samcheok Eco Materials Co., Ltd. Payment guarantees(*4) — SEM Investment Co., Ltd. Korea Midland Power Co., Ltd. Hyundai Green Power Co., Ltd. Collateralized money invested KRW 127,160 Korea Development Bank and others Korea Midland Power Co., Ltd. PT. Cirebon Electric Power Debt guarantees USD 11,825 Mizuho Bank Korea Midland Power Co., Ltd. PT Wampu Electric Power Debt guarantees USD 4,854 SMBC Korea Midland Power Co., Ltd. YaksuESS Co., Ltd Collateralized money invested KRW 460 Hanwha Life Insurance Co., Ltd. Guarantees for supplemental funding(*1) — Hanwha Life Insurance Co., Ltd. Korea Midland Power Co., Ltd. YeongGwang Yaksu Wind Electric. Co., Ltd Collateralized money invested KRW 533 Hanwha Life Insurance Co., Ltd. and others Korea South-East Power Co., Ltd. Hyundai Energy Co., Ltd. Collateralized money invested(*5) — Korea Development Bank and others Guarantees for supplemental funding and others(*1,6) KRW 78,600 Korea Development Bank and others Korea South-East Power Co., Ltd. RES Technology AD Collateralized money invested KRW 15,209 UniCredit Bulbank and others Korea South-East Power Co., Ltd. ASM-BG Collateralized money invested KRW 21,379 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. S-Power Collateralized money invested KRW 114,566 Korea Development Bank and others Korea South-East Power Co., Ltd. Goseong Green Energy Co., Ltd. Collateralized money invested KRW 2,459 Kyobo Life Insurance Co., Ltd. and others Korea South-East Power Co., Ltd. Gangneung Eco Power Co., Ltd. Collateralized money invested KRW 2,495 Kyobo Life Insurance Co., Ltd. and others Korea South-East Power Co., Ltd. PND solar., Ltd. Collateralized money invested KRW 1,020 IBK and others Korea South-East Power Co., Ltd. Tamra Offshore Wind Power Co., Ltd. Collateralized money invested KRW 10,401 Nonghyup Life Insurance Co., Ltd. and others Korea South-East Power Co., Ltd. Hyundai Eco Energy Co., Ltd. Collateralized money invested KRW 3,388 Samsung Life Insurance and others Korea Hydro & Nuclear Power Co., Ltd. Noeul Green Energy Co., Ltd. Collateralized money invested KRW 8,016 KEB Hana Bank and others Korea Hydro & Nuclear Power Co., Ltd. Busan Green Energy Co., Ltd. Collateralized money invested KRW 12,537 Shinhan Bank and others KEPCO Plant Service & Engineering Co., Ltd. Incheon New Power Co., Ltd. Collateralized money invested KRW 579 Shinhan Bank Guarantees for supplemental funding and others(*1) — Shinhan Bank (*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 14,730 thousand and the total amount of guarantees is USD 8,257.5 thousand which consists of USD 3,670 thousand of EWP (Barbados) 1 SRL’s contribution obligation and USD 4,587.5 thousand of South Jamaica Energy Holding Limited’s portion (50%) of contribution obligation. (*4) The Company has the obligation 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. In relation to this guarantee, the Company has recognized ￦2,155 million of derivative liabilities as of December 31, 2018. (*5) The Company recognized 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 ￦40,898 million as the possibility of economic outflow to fulfill the obligation was 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.
Derivatives transactions with related parties	Derivatives transactions with related parties as of December 31, 2018 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 2016~2019 ￦ 105,260 USD 100,000 2.48 % 2.38 % ￦ 1,052.60 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 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 2018~2023 320,880 USD 300,000 2.03 % 3.75 % 1,069.60 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 2018.12.18 2019.01.22 11,279 USD 10,000 1,127.85 2018.12.13 2019.01.10 4,490 USD 4,000 1,122.60 2018.12.24 2019.01.10 13,497 USD 12,000 1,124.74 2018.12.21 2019.01.15 10,103 USD 9,000 1,122.50 2018.12.27 2019.01.23 11,207 USD 10,000 1,120.68 2018.12.28 2019.01.23 13,412 USD 12,000 1,117.64
Salaries and other compensations to the key members of management of the Company	Salaries and other compensations to the key members of management of the Company for the years ended December 31, 2016, 2017 and 2018 are as follows: Type 2016 2017 2018 In millions of won Salaries ￦ 1,463 1,271 1,106 Employee benefits 33 54 24 ￦ 1,496 1,325 1,130

Non-Cash Transactions (Tables)

Non-Cash Transactions (Tables)	12 Months Ended
	Dec. 31, 2018
Non-Cash Transactions [Abstract]
Significant non-cash activities	Significant non-cash Transactions 2016 2017 2018 In millions of won Transfer from construction-in-progress ￦ 19,971,599 13,676,233 8,656,252 Recognition of asset retirement cost and related provision for decommissioning costs 470,941 2,494,802 310,272 Transfer from provision for disposal of spent nuclear fuel to accrued expenses 283,675 342,861 482,699

Commitments for Expenditure (Ta

Commitments for Expenditure (Tables)	12 Months Ended
	Dec. 31, 2018
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, 2017 and 2018 are as follows: 2017 2018 Contracts Amounts Balance Amounts Balance In millions of won Purchase of switch (25.8kV Eco) 12,450 ￦ 50,526 35,494 50,526 — Purchase of cable (PVC,1C,2000SQ) 153,000M and others (Shin-Bupyung-Youngseo) 50,256 42,857 56,183 37,309 Purchase of cable (PVC, 1C, 2500SQ) 103,374M and others (Bukdangjin-Shintangjung) 42,500 29,987 44,315 31,801 Purchase of GIS (362KV 6300A 63KA) 23CB – YoungseoS/S 34,500 34,500 34,500 34,500 Purchase of GIS (362KV 6300A 63KA) 27CB – KwangyangS/S 37,476 18,044 37,694 10,491 Purchase of GIS (800KV 8000A 50KA) 10CB – Shin-JungbuS/S 63,730 44,955 63,730 — Purchase of transformer (765/345/23kV 666.7MVA, 2TANK) 6 units – Shin-JungbuS/S 37,500 37,500 37,500 — Purchase of cable (TR CNCE-W/AL,1C,400SQ) 78,076 76,762 78,076 — Purchase of Concrete Poles (10M, 350KGF) 121,900 and 6 others 133,387 112,981 133,387 13,343 Advanced E-Type 65,408 64,592 65,408 — Purchase of Ground Switch (44-D-A125, 56,482 55,990 56,482 — Purchase of cable (TR CNCE-W/AL,1C,400SQ) — — 66,240 38,998 Purchase of cable (FR CNCO-W,1C,325SQ) — — 57,475 48,598 Purchase of switch (Eco) 9,360 units — — 40,631 34,797 Construction of Shin-Kori units (#3,4) 7,363,514 93,637 7,363,514 3,211 Construction of Shin-Kori units (#5,6) 8,625,387 6,757,146 8,625,387 5,930,099 Construction of Shin-Hanul units (#1,2) 7,982,342 1,015,813 7,982,342 355,704 Construction of Shin-Hanul units (#3,4)(*) 8,261,818 8,097,056 — — Other 26 contracts 262,400 114,041 269,681 161,243 Purchase of main machine for construction of Seoul Combined units (#1,2) 361,203 99,031 365,164 51,165 Construction of Seoul Combined units (#1,2) 227,685 60,568 285,890 27,125 Purchase of smoke eliminating machine for construction of Shin-Boryeong units (#1,2) 169,544 36,417 172,609 13,986 Service of designing Shin-Boryeong units (#1,2) 127,810 16,371 120,199 1,076 Purchase of main machine for construction of Shin-Boryeong units (#1,2) 866,065 4,981 866,065 4,981 Construction of Shin-Boryeong units (#1,2) 316,190 23,100 309,466 — Purchase of furnace for construction of Shin-Seocheon thermal power plant 302,030 222,555 305,209 74,631 Purchase of turbine generator for construction of Shin-Seocheon thermal power plant 104,402 83,522 104,402 57,968 Electricity construction of Shin-Seocheon thermal power plant 200,453 196,993 217,848 174,122 Purchase of main machine for Jeju LNG combined 166,287 15,409 166,287 11,272 Purchase of coal handling machine for construction of Taean (#9,10) and IGCC units (conditional contract for installation) 193,375 5,129 205,764 282 Purchase of furnace for construction of Taean units (#9,10) 566,945 33,817 556,504 18,502 Service of designing Taean units (#9,10) 111,322 13,671 112,344 13,338 Purchase of turbine generator for construction of Taean units (#9,10) 205,267 550 214,462 10,422 Purchase of oxygen plant for construction of Taean IGCC units 94,564 199 96,068 1,552 Service of designing Taean IGCC plant units 44,802 2,669 46,001 3,161 Purchase of furnace for construction of Samcheok units (#1,2) 1,082,641 5,963 1,092,287 12,215 Purchase of coal handling machine for construction of Samcheok units (#1,2) 304,924 52,362 307,925 48,736 Service of designing Samcheok units (#1,2) 114,047 4,745 103,679 — Purchase of turbine main equipment for Samcheok units (#1,2) 215,333 874 212,188 348 Purchase of main equipment for Namjeju — — 146,594 134,949 (*) The Company recognized impairment loss in relation to Shin-Hanul unit 3 and 4, and there are no legally binding commitments for expenditure as of December 31, 2018.
Commitments for inventory purchase	Contract periods for ore concentrates, conversion, enrichment and design and fabrication are as follows: Type Periods Contracted quantity Concentrate 2018 ~ 2030 48,162 Ton U3O8 Transformed 2018 ~ 2030 23,484 Ton U Enrichment 2018 ~ 2030 25,530 Ton SWU Molded 2018 ~ 2022 520 Ton U

Contingencies and Commitments (

Contingencies and Commitments (Tables)	12 Months Ended
	Dec. 31, 2018
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, 2017 and 2018 are as follows: 2017 2018 Number Claim Number Claim In millions of won As the defendant 565 ￦ 477,719 570 673,882 As the plaintiff 185 690,934 174 793,491
Credit lines provided by financial institutions	Credit lines provided by financial institutions as of December 31, 2018 are as follows: Commitments Financial institutions Currency Limited amount Exercised amount In millions of won and thousands of foreign Commitments on bank-overdraft Nonghyup Bank and KRW 1,855,000 167,010 Commitments on bank-daylight overdraft Nonghyup Bank KRW 280,000 — Limit amount available for CP KEB Hana Bank and KRW 1,050,000 — Limit amount available for card KEB Hana Bank and KRW 55,904 2,740 Banco de Oro PHP 5,000 5,000 Loan limit Kookmin Bank and KRW 1,238,500 612,197 DBS Bank and USD 1,840,700 20,000 Certification of payment on payables from foreign country Kookmin Bank and USD 44,680 4,754 Certification of payment on L/C Shinhan Bank and USD 992,434 252,392 Certification of performance guarantee on contract KEB Hana Bank and EUR 4,158 4,158 KEB Hana Bank and INR 237,321 237,321 Korea Development JPY 637,322 637,322 Seoul Guarantee Insurance and others KRW 89,335 72,802 First Abu Dhabi USD 923,915 830,314 KEB Hana Bank SAR 6,508 6,508 Bank of Kathmandu NPR 36,304 36,304 KEB Hana Bank CAD 617 617 Certification of bidding KEB Hana Bank and USD 110,000 3,199 Shinhan Bank ZAR 55,730 55,730 Advance payment bond, Warranty bond, Retention bond and others Export-Import Bank USD 3,934,928 3,220,418 Others Shinhan Bank JPY 381,210 381,210 Nonghyup Bank and KRW 307,436 7,088 Export-Import Bank USD 1,171,470 842,897 Inclusive credit Shinhan Bank INR 70,028 70,028 KEB Hana Bank KRW 258,000 12,278 KEB Hana Bank and USD 30,930 18,245 Trade finance BNP Paribas and USD 800,000 —
Blank check and assets provided as collaterals or pledges to financial institutions by the Company	As of December 31, 2018, 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 Korea Southern Power Co., Ltd. Korea Development Bank and others Shareholdings of DS Power Co., Ltd. KRW 916 Collateral for borrowings Mira Power Limited International Finance Corporation and others Property, plant and equipment and others USD 275,600 Collateral for borrowings(*2) Gyeonggi Green Energy Co., Ltd. Korea Development Bank and others Cash and cash equivalents KRW 327,080 Collateral for borrowings(*1) Commerce and Industry Energy Co., Ltd. IBK and others Land, buildings, structures and machinery and others KRW 110,500 Collateral for borrowings(*1) KOSPO Youngnam Power Co., Ltd. Shinhan Bank and others Cash and cash equivalents KRW 396,120 Collateral for borrowings(*1) 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(*1) Korea Offshore Wind Power Co., Ltd Woori Bank and others Utility plant and others KRW 293,400 Collateral for borrowings 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(*2) KST Electric Power Company The Export—Import Bank of Korea and others Finance lease receivable and property, plant and equipment and others USD 337,000 Collateral for borrowings(*2) (*1) As of December 31, 2018, the Company has established guarantees for pledge for transfer of rights of long-term borrowings, pledge for insurance claims, pledge for shares, etc. (*2) This is based on the amount of loan commitment limit. The Company has ￦1,197 million of project loans from Korea Energy Agency as of December 31, 2018. The Company has provided a blank check as repayment guarantee.

Subsequent Events (Tables)

Subsequent Events (Tables)	12 Months Ended
	Dec. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent to December 31, 2018, Korea Midland Power Co., Ltd., Korea Western Power Co., Ltd. and Korea East-West Power Co., Ltd. issued foreign bond, corporate bonds and non-guaranteed Company Name Type Issue date Maturity Interest rate (%) Amount In millions of won and thousands of foreign currencies Korea Midland Power Co., Ltd. #7 foreign bond 2019.01.22 2022.01.22 3.38 % USD 300,000 #47-1 2019.02.08 2039.02.08 2.19 % KRW 160,000 #47-2 2019.02.08 2049.02.08 2.17 % KRW 120,000 Korea Western Power Co., Ltd. #2 Swiss Franc bond 2019.02.27 2024.02.27 0.13 % CHF 200,000 Korea East-West Power Co., Ltd. #32-1 non-guaranteed 2019.03.07 2039.03.07 2.18 % KRW 40,000 #32-2 non-guaranteed 2019.03.07 2049.03.07 2.16 % KRW 40,000

General Information (Details)

General Information (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
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, 2018	Dec. 31, 2017	Dec. 31, 2016
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	173,769,250
Percentage of ownership	27.07%
Other Shareholders
Disclosure of shareholders information [Line Items]
Number of shares	140,117,769
Percentage of ownership	21.83%

Explanation of initial applicat

Explanation of initial application of IFRS 9 (Details) ₩ in Millions	Jan. 01, 2018KRW (₩)
Disclosure of Explanation of initial application of IFRS 9 [Line Items]
Financial assets, carrying amount immediately before initial application of IFRS 9	₩ 16,018,152
Financial assets, carrying amount immediately after initial application of IFRS 9	16,011,383
Financial assets at FVTPL | Financial assets at FVTPL
Disclosure of Explanation of initial application of IFRS 9 [Line Items]
Financial assets, carrying amount immediately before initial application of IFRS 9	111,512
Financial assets, carrying amount immediately after initial application of IFRS 9	111,512
Loans and receivables | Amortized cost
Disclosure of Explanation of initial application of IFRS 9 [Line Items]
Financial assets, carrying amount immediately before initial application of IFRS 9	15,203,663
Financial assets, carrying amount immediately after initial application of IFRS 9	14,405,570
Loans and receivables | Financial assets at FVTPL
Disclosure of Explanation of initial application of IFRS 9 [Line Items]
Financial assets, carrying amount immediately before initial application of IFRS 9	0
Financial assets, carrying amount immediately after initial application of IFRS 9	791,324
Available-for-sale financial assets | FVOCI
Disclosure of Explanation of initial application of IFRS 9 [Line Items]
Financial assets, carrying amount immediately before initial application of IFRS 9	699,833
Financial assets, carrying amount immediately after initial application of IFRS 9	471,903
Available-for-sale financial assets | Financial assets at FVTPL
Disclosure of Explanation of initial application of IFRS 9 [Line Items]
Financial assets, carrying amount immediately before initial application of IFRS 9	0
Financial assets, carrying amount immediately after initial application of IFRS 9	227,930
Held-to-maturity investments | Amortized cost
Disclosure of Explanation of initial application of IFRS 9 [Line Items]
Financial assets, carrying amount immediately before initial application of IFRS 9	3,144
Financial assets, carrying amount immediately after initial application of IFRS 9	₩ 3,144

Impairment Explanation of initi

Impairment Explanation of initial application of IFRS 9 (Details) ₩ in Millions	Jan. 01, 2018KRW (₩)
Disclosure of Impairment Explanation of initial application of IFRS 9 [Line Items]
Reclassification of cumulative gain or loss of available-for-sale financial assets	₩ 0
Remeasurement of expected credit loss
- Trade and other receivables	(6,769)
- Income tax effect	1,846
Total	(4,923)
Equity attributable to owners of parent
Remeasurement of expected credit loss
Total	(4,923)
Retained earnings
Disclosure of Impairment Explanation of initial application of IFRS 9 [Line Items]
Reclassification of cumulative gain or loss of available-for-sale financial assets	76,851
Remeasurement of expected credit loss
- Trade and other receivables	(6,769)
- Income tax effect	1,846
Total	71,928
Other Components Of Equity
Disclosure of Impairment Explanation of initial application of IFRS 9 [Line Items]
Reclassification of cumulative gain or loss of available-for-sale financial assets	(76,851)
Remeasurement of expected credit loss
- Trade and other receivables	0
- Income tax effect	0
Total	(76,851)
Non-controlling interests
Disclosure of Impairment Explanation of initial application of IFRS 9 [Line Items]
Reclassification of cumulative gain or loss of available-for-sale financial assets	0
Remeasurement of expected credit loss
- Trade and other receivables	0
- Income tax effect	0
Total	₩ 0

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, 2018
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
Finance lease assets
Disclosure of useful life of property plant and equipment [Line Items]
Useful lives (years)	6 ~ 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, 2018
Usage rights for donated assets
Disclosure of intangible assets with indefinite useful life [Line Items]
Useful lives (years)	10 ~ 20
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
Mining rights
Disclosure of intangible assets with indefinite useful life [Line Items]
Useful lives (years)	-
Amortization methods	Unit of production
Other intangible assets
Disclosure of intangible assets with indefinite useful life [Line Items]
Useful lives (years)	3 ~ 50 or Indefinite
Amortization methods	Straight line

Operating segments (Details)

Operating segments (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of operating segments [Line Items]
Total segment revenue	₩ 60,033,062	₩ 59,335,889	₩ 59,763,087
Intersegment revenue	0	0	0
Revenue from external customers	60,033,062	59,335,889	59,763,087
Depreciation and amortisation	10,024,794	9,773,711	8,960,988
Interest income	223,767	206,143	241,778
Interest expense	1,868,458	1,789,552	1,752,868
Employee benefit expense	360,575	391,360	373,753
Loss on abandonment of property, plant and equipment	481,176	424,091	426,519
Increase in provisions, net	1,056,994	1,690,120	1,782,732
Operating profit (loss)	(685,109)	5,319,869	12,296,360
Finance income	796,870	1,530,618	791,543
Finance expense	(2,470,743)	(3,127,952)	(2,437,087)
Profit (loss) related to associates and joint ventures	358,163	(108,317)	(137,348)
Profit (loss) before income tax	(2,000,819)	3,614,218	10,513,468
Segment assets	185,249,061	181,788,915	177,837,042
Investments in associates and joint ventures	5,878,345	5,330,696	5,510,448
Acquisition of non-current assets	12,377,457	12,679,845	12,153,211
Segment liabilities	114,156,299	108,824,274	104,786,497
Operating segments
Disclosure of operating segments [Line Items]
Total segment revenue	97,262,180	94,974,836	95,611,310
Intersegment revenue	37,229,118	35,638,947	35,848,223
Revenue from external customers	60,033,062	59,335,889	59,763,087
Depreciation and amortisation	10,081,743	9,833,297	9,006,486
Interest income	268,043	230,685	264,764
Interest expense	1,912,094	1,818,399	1,778,479
Employee benefit expense	391,055	421,827	400,072
Loss on abandonment of property, plant and equipment	481,176	424,091	426,519
Increase in provisions, net	1,049,005	2,076,867	1,785,741
Operating profit (loss)	(557,368)	5,152,814	12,543,173
Profit (loss) related to associates and joint ventures	358,163	(108,317)	(137,348)
Segment assets	223,823,428	220,561,693	216,061,727
Investments in associates and joint ventures	5,878,345	5,330,696	5,510,448
Acquisition of non-current assets	12,440,174	12,656,229	12,345,112
Segment liabilities	115,812,546	110,538,279	107,405,716
Operating segments | Transmission and distribution
Disclosure of operating segments [Line Items]
Total segment revenue	59,676,952	59,486,766	59,862,284
Intersegment revenue	1,393,120	2,044,160	1,890,489
Revenue from external customers	58,283,832	57,442,606	57,971,795
Depreciation and amortisation	3,555,158	3,466,410	3,226,700
Interest income	77,925	49,987	80,882
Interest expense	708,329	737,971	844,200
Employee benefit expense	144,180	158,738	162,326
Loss on abandonment of property, plant and equipment	424,774	384,595	424,356
Increase in provisions, net	580,931	885,195	711,430
Operating profit (loss)	(1,814,363)	1,902,634	5,274,308
Profit (loss) related to associates and joint ventures	287,268	(105,166)	(128,402)
Segment assets	107,486,379	106,540,154	105,321,129
Investments in associates and joint ventures	3,671,897	3,366,309	4,121,462
Acquisition of non-current assets	6,323,504	6,606,512	6,345,004
Segment liabilities	53,404,610	50,757,798	49,854,420
Operating segments | Electric power generation (Nuclear)
Disclosure of operating segments [Line Items]
Total segment revenue	8,858,717	9,415,752	11,168,579
Intersegment revenue	8,833,787	9,359,468	11,129,385
Revenue from external customers	24,930	56,284	39,194
Depreciation and amortisation	3,088,019	3,267,510	3,130,820
Interest income	30,422	21,034	33,111
Interest expense	503,161	487,503	474,590
Employee benefit expense	76,467	80,809	70,582
Loss on abandonment of property, plant and equipment	38,886	0	0
Increase in provisions, net	520,167	801,800	576,223
Operating profit (loss)	357,401	1,347,794	3,770,165
Profit (loss) related to associates and joint ventures	9,946	3,637	(1,082)
Segment assets	55,792,704	55,011,096	52,782,915
Investments in associates and joint ventures	43,038	11,843	15,384
Acquisition of non-current assets	2,187,077	2,083,967	1,945,610
Segment liabilities	30,484,104	29,252,816	27,366,938
Operating segments | Electric power generation (Non-nuclear)
Disclosure of operating segments [Line Items]
Total segment revenue	25,204,085	22,795,816	21,394,223
Intersegment revenue	24,389,816	21,885,251	20,561,044
Revenue from external customers	814,269	910,565	833,179
Depreciation and amortisation	3,269,023	2,954,375	2,523,306
Interest income	29,313	18,860	24,171
Interest expense	577,441	486,176	359,607
Employee benefit expense	91,140	94,075	79,846
Loss on abandonment of property, plant and equipment	17,516	39,335	2,133
Increase in provisions, net	(227,234)	171,457	276,619
Operating profit (loss)	482,418	1,523,497	3,211,684
Profit (loss) related to associates and joint ventures	58,993	(6,718)	(8,342)
Segment assets	49,296,392	47,938,084	47,427,642
Investments in associates and joint ventures	2,114,203	1,904,224	1,320,203
Acquisition of non-current assets	3,435,222	3,250,524	3,508,313
Segment liabilities	27,558,156	26,337,295	26,205,049
Operating segments | Plant maintenance & engineering service
Disclosure of operating segments [Line Items]
Total segment revenue	2,526,126	2,621,440	2,618,388
Intersegment revenue	2,170,959	2,211,716	2,190,207
Revenue from external customers	355,167	409,724	428,181
Depreciation and amortisation	114,030	109,001	98,843
Interest income	12,505	10,801	10,672
Interest expense	4,126	2,967	2,156
Employee benefit expense	77,526	87,344	86,268
Loss on abandonment of property, plant and equipment	0	161	0
Increase in provisions, net	174,785	219,382	221,301
Operating profit (loss)	314,755	265,593	210,680
Profit (loss) related to associates and joint ventures	1,956	(70)	478
Segment assets	3,431,068	3,273,959	3,106,909
Investments in associates and joint ventures	49,207	48,320	53,399
Acquisition of non-current assets	111,393	145,779	180,715
Segment liabilities	1,200,390	1,176,627	1,218,047
Operating segments | Others
Disclosure of operating segments [Line Items]
Total segment revenue	996,300	655,062	567,836
Intersegment revenue	441,436	138,352	77,098
Revenue from external customers	554,864	516,710	490,738
Depreciation and amortisation	55,513	36,001	26,817
Interest income	117,878	130,003	115,928
Interest expense	119,037	103,782	97,926
Employee benefit expense	1,742	861	1,050
Loss on abandonment of property, plant and equipment	0	0	30
Increase in provisions, net	356	(967)	168
Operating profit (loss)	102,421	113,296	76,336
Profit (loss) related to associates and joint ventures	0	0	0
Segment assets	7,816,885	7,798,400	7,423,132
Investments in associates and joint ventures	0	0	0
Acquisition of non-current assets	382,978	569,447	365,470
Segment liabilities	3,165,286	3,013,743	2,761,262
Material reconciling items
Disclosure of operating segments [Line Items]
Total segment revenue	(37,229,118)	(35,638,947)	(35,848,223)
Intersegment revenue	(37,229,118)	(35,638,947)	(35,848,223)
Depreciation and amortisation	(56,949)	(59,586)	(45,498)
Interest income	(44,276)	(24,542)	(22,986)
Interest expense	(43,636)	(28,847)	(25,611)
Employee benefit expense	(30,480)	(30,467)	(26,319)
Increase in provisions, net	7,989	(386,747)	(3,009)
Operating profit (loss)	(127,741)	167,055	(246,813)
Segment assets	(38,574,367)	(38,772,778)	(38,224,685)
Investments in associates and joint ventures	0	0	0
Acquisition of non-current assets	(62,717)	23,616	(191,901)
Segment liabilities	(1,656,247)	(1,714,005)	₩ (2,619,219)
Elimination of intersegment amounts
Disclosure of operating segments [Line Items]
Segment assets	(41,026,970)	(39,517,829)
Investments in associates and joint ventures	0	0
Acquisition of non-current assets	(62,717)	23,616
Segment liabilities	(5,055,737)	(5,239,156)
Equity method adjustment
Disclosure of operating segments [Line Items]
Segment assets	964,234	754,314
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	2,131	2,215
Investments in associates and joint ventures	0	0
Acquisition of non-current assets	0	0
Segment liabilities	(621)	5,339,450
Others
Disclosure of operating segments [Line Items]
Segment assets	1,486,238	(11,478)
Investments in associates and joint ventures	0	0
Acquisition of non-current assets	0	0
Segment liabilities	₩ 3,400,111	₩ (1,814,299)

Geographical areas (Details)

Geographical areas (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue
Electricity		₩ 56,842,011	₩ 54,649,882	₩ 54,304,529
Heat supply		216,117	205,838	181,597
Others		839,676	916,828	893,361
Sales of goods		57,897,804	55,772,548	55,379,487
Sales of services		392,867	351,157	356,743
Sales of construction services		1,742,391	3,212,184	4,026,857
Total revenue from external customers		60,033,062	59,335,889	59,763,087
Non-current assets	[1]	160,336,774	157,934,345	152,772,376
Domestic
Revenue
Electricity		56,842,011	54,649,882	54,304,529
Heat supply		216,117	205,838	181,597
Others		456,738	517,596	495,969
Sales of goods		57,514,866	55,373,316	54,982,095
Sales of services		176,539	186,990	195,697
Sales of construction services		108,586	92,501	132,219
Total revenue from external customers		57,799,991	55,652,807	55,310,011
Non-current assets	[1]	157,037,428	153,436,810	148,297,677
Overseas
Revenue
Electricity		0	0	0
Heat supply		0	0	0
Others		382,938	399,232	397,392
Sales of goods		382,938	399,232	397,392
Sales of services		216,328	164,167	161,046
Sales of construction services		1,633,805	3,119,683	3,894,638
Total revenue from external customers	[2]	2,233,071	3,683,082	4,453,076
Non-current assets	[1],[2]	₩ 3,299,346	₩ 4,497,535	₩ 4,474,699
[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, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of Classification by categories of financial assets [Line Items]
Cash and cash equivalents		₩ 1,358,345	₩ 2,369,739	₩ 3,051,353	₩ 3,783,065
Categories of current financial assets
Held-to-maturity investments			5
Current financial assets at fair value through profit or loss	[1]	313,893
Current financial assets at amortised cost		11,956
Current Derivative assets		42,107	12,935	193,283
Other financial assets		1,991,939	1,945,417
Trade and other receivables		7,793,592	7,928,972
Total current financial assets And Cash and cash equivalents		11,511,832	12,257,068
Non-Financial Assets
Available-for-sale financial assets			699,833
Held-to-maturity investments			3,139
Non-current financial assets at fair value through profit or loss	[1]	607,042
Non-current financial assets at fair value through other comprehensive income		399,495
Non-current financial assets at amortised cost		2,086
Non-current Derivative assets		60,228	19,691	₩ 588,091
Other financial assets		1,044,762	1,316,250
Trade and other receivables		1,819,845	1,754,797
Total non-current financial assets		3,933,458	3,793,710
Total financial assets		15,445,290	16,050,778
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
Held-to-maturity investments			0
Current financial assets at fair value through profit or loss		313,893
Current financial assets at amortised cost		0
Current Derivative assets		13,936	12,923
Other financial assets	[2]	0	0
Trade and other receivables		0	0
Total current financial assets And Cash and cash equivalents		327,829	12,923
Non-Financial Assets
Available-for-sale financial assets			0
Held-to-maturity investments			0
Non-current financial assets at fair value through profit or loss		607,042
Non-current financial assets at fair value through other comprehensive income		0
Non-current financial assets at amortised cost		0
Non-current Derivative assets		23,695	9,097
Other financial assets	[2]	0	111,512
Trade and other receivables		0	0
Total non-current financial assets		630,737	120,609
Total financial assets		958,566	133,532
Financial assets at fair value through other comprehensive income
Disclosure of Classification by categories of financial assets [Line Items]
Cash and cash equivalents		0
Categories of current financial assets
Current financial assets at fair value through profit or loss		0
Current financial assets at amortised cost		0
Current Derivative assets		0
Other financial assets		0
Trade and other receivables		0
Total current financial assets And Cash and cash equivalents		0
Non-Financial Assets
Non-current financial assets at fair value through profit or loss		0
Non-current financial assets at fair value through other comprehensive income		399,495
Non-current financial assets at amortised cost		0
Non-current Derivative assets		0
Other financial assets		0
Trade and other receivables		0
Total non-current financial assets		399,495
Total financial assets		399,495
Financial assets at amortized cost
Disclosure of Classification by categories of financial assets [Line Items]
Cash and cash equivalents		1,358,345
Categories of current financial assets
Current financial assets at amortised cost		11,956
Current Derivative assets		0
Other financial assets		1,991,939
Trade and other receivables		7,793,592
Total current financial assets And Cash and cash equivalents		11,155,832
Non-Financial Assets
Non-current financial assets at fair value through profit or loss		0
Non-current financial assets at fair value through other comprehensive income		0
Non-current financial assets at amortised cost		2,086
Non-current Derivative assets		0
Other financial assets		1,044,762
Trade and other receivables		1,819,845
Total non-current financial assets		2,866,693
Total financial assets		14,022,525
Loans and receivables
Disclosure of Classification by categories of financial assets [Line Items]
Cash and cash equivalents			2,369,739
Categories of current financial assets
Held-to-maturity investments			0
Current Derivative assets			0
Other financial assets			1,945,417
Trade and other receivables			7,928,972
Total current financial assets And Cash and cash equivalents			12,244,128
Non-Financial Assets
Available-for-sale financial assets			0
Held-to-maturity investments			0
Non-current Derivative assets			0
Other financial assets			1,204,738
Trade and other receivables			1,754,797
Total non-current financial assets			2,959,535
Total financial assets			15,203,663
Financial assets available-for-sale
Disclosure of Classification by categories of financial assets [Line Items]
Cash and cash equivalents			0
Categories of current financial assets
Held-to-maturity investments			0
Current Derivative assets			0
Other financial assets			0
Trade and other receivables			0
Total current financial assets And Cash and cash equivalents			0
Non-Financial Assets
Available-for-sale financial assets			699,833
Held-to-maturity investments			0
Non-current Derivative assets			0
Other financial assets			0
Trade and other receivables			0
Total non-current financial assets			699,833
Total financial assets			699,833
Held-to-maturity investments
Disclosure of Classification by categories of financial assets [Line Items]
Cash and cash equivalents			0
Categories of current financial assets
Held-to-maturity investments			5
Current Derivative assets			0
Other financial assets			0
Trade and other receivables			0
Total current financial assets And Cash and cash equivalents			5
Non-Financial Assets
Available-for-sale financial assets			0
Held-to-maturity investments			3,139
Non-current Derivative assets			0
Other financial assets			0
Trade and other receivables			0
Total non-current financial assets			3,139
Total financial assets			3,144
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
Held-to-maturity investments			0
Current financial assets at fair value through profit or loss		0
Current financial assets at amortised cost		0
Current Derivative assets		28,171	12
Other financial assets		0	0
Trade and other receivables		0	0
Total current financial assets And Cash and cash equivalents		28,171	12
Non-Financial Assets
Available-for-sale financial assets			0
Held-to-maturity investments			0
Non-current financial assets at fair value through profit or loss		0
Non-current financial assets at fair value through other comprehensive income		0
Non-current financial assets at amortised cost		0
Non-current Derivative assets		36,533	10,594
Other financial assets		0	0
Trade and other receivables		0	0
Total non-current financial assets		36,533	10,594
Total financial assets		₩ 64,704	₩ 10,606
[1]	As of December 31, 2018, the Company invested KRW528,006 million exclusively for payment of decommissioning costs of nuclear power plants.
[2]	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'.

Classification of Financial I_4

Classification of Financial Instruments - Classification of financial liabilities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Categories of current financial liabilities
Borrowings	₩ 1,172,624	₩ 1,165,985
Debt securities	6,788,824	7,957,300
Derivative liabilities	20,431	71,267	₩ 3,251
Trade and other payables	6,405,395	5,999,521
Total current financial liabilities	14,387,274	15,194,073
Categories of non-current financial liabilities
Borrowings	3,258,015	2,434,624
Debt securities	49,815,164	43,189,483
Derivative liabilities	291,732	356,792	₩ 135,435
Trade and other payables	2,941,696	3,223,480
Total non-current financial liabilities	56,306,607	49,204,379
Total financial liabilities	70,693,881	64,398,452
Financial liabilities at fair value through profit or loss
Categories of current financial liabilities
Borrowings	0	0
Debt securities	0	0
Derivative liabilities	13,706	51,090
Trade and other payables	0	0
Total current financial liabilities	13,706	51,090
Categories of non-current financial liabilities
Borrowings	0	0
Debt securities	0	0
Derivative liabilities	85,304	99,839
Trade and other payables	0	0
Total non-current financial liabilities	85,304	99,839
Total financial liabilities	99,010	150,929
Financial liabilities recognized at amortized cost
Categories of current financial liabilities
Borrowings	1,172,624	1,165,985
Debt securities	6,788,824	7,957,300
Derivative liabilities	0	0
Trade and other payables	6,405,395	5,999,521
Total current financial liabilities	14,366,843	15,122,806
Categories of non-current financial liabilities
Borrowings	3,258,015	2,434,624
Debt securities	49,815,164	43,189,483
Derivative liabilities	0	0
Trade and other payables	2,941,696	3,223,480
Total non-current financial liabilities	56,014,875	48,847,587
Total financial liabilities	70,381,718	63,970,393
Derivative liabilities (using hedge accounting)
Categories of current financial liabilities
Borrowings	0	0
Debt securities	0	0
Derivative liabilities	6,725	20,177
Trade and other payables	0	0
Total current financial liabilities	6,725	20,177
Categories of non-current financial liabilities
Borrowings	0	0
Debt securities	0	0
Derivative liabilities	206,428	256,953
Trade and other payables	0	0
Total non-current financial liabilities	206,428	256,953
Total financial liabilities	₩ 213,153	₩ 277,130

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, 2018	Dec. 31, 2017	Dec. 31, 2016
Income, expense, gains or losses of financial instruments
Interest income		₩ 223,767	₩ 206,143	₩ 241,778
Dividend income		12,777	11,477	9,446
Impairment of available-for-sale financial assets			(2,713)	(86,703)
Gain (loss) on valuation of derivatives		153,203	(874,667)	288,068
Gain (loss) on transaction of derivatives		147,297
Gain (loss) on valuation of derivatives (equity, before tax)		(6,429)
Gain (loss) on valuation of financial assets		1,879	12	0
Gain on disposal of financial assets		1,837
Interest expense of borrowings and debt securities		(1,320,516)
Interest expense of trade and other payables		(42,830)	(57,160)	(68,375)
Interest expense of others		(505,112)	(491,665)	(482,428)
Gain (loss) on foreign currency transactions and translations		(356,159)
Cash and Cash Equivalents
Income, expense, gains or losses of financial instruments
Interest income		40,704	35,474	61,380
Financial assets available-for-sale
Income, expense, gains or losses of financial instruments
Dividend income			11,477	9,446
Impairment of available-for-sale financial assets			(2,713)	(86,703)
Gain (loss) on disposal of available-for-sale financial assets			(1,213)	1,473
Financial assets at amortized cost
Income, expense, gains or losses of financial instruments
Interest income		89
Held-to-maturity investments
Income, expense, gains or losses of financial instruments
Interest income			82	97
Loans and receivables
Income, expense, gains or losses of financial instruments
Interest income		21,925	30,014	25,106
Trade and other receivables
Income, expense, gains or losses of financial instruments
Interest income		90,390	102,727	102,237
Short-term financial instruments
Income, expense, gains or losses of financial instruments
Interest income		41,025	29,412	45,763
Long-term financial instruments
Income, expense, gains or losses of financial instruments
Interest income		7,920	8,144	7,195
Other financial assets
Income, expense, gains or losses of financial instruments
Interest income		1
Financial assets at fair value through profit or loss
Income, expense, gains or losses of financial instruments
Interest income		21,713	290
Gain (loss) on valuation of derivatives		34,117	(214,100)	113,671
Gain (loss) on transaction of derivatives		39,114	(37,266)	(8,039)
Gain (loss) on valuation of financial assets		1,879	12
Gain on disposal of financial assets		1,837
Financial assets at fair value through other comprehensive income
Income, expense, gains or losses of financial instruments
Dividend income		12,777
Derivative assets (applying hedge accounting)
Income, expense, gains or losses of financial instruments
Gain (loss) on valuation of derivatives		69,799	(41,129)	145,458
Gain (loss) on transaction of derivatives		34,152	(58,299)	(13,994)
Gain (loss) on valuation of derivatives (equity, before tax)	[1]	8,600	2,453	50,047
Financial liabilities carried at amortized cost
Income, expense, gains or losses of financial instruments
Interest expense of borrowings and debt securities		(1,320,516)	(1,240,727)	(1,202,065)
Interest expense of trade and other payables		(42,830)	(57,160)	(68,375)
Interest expense of others		(505,112)	(491,665)	(482,428)
Loss on retirement of financial liabilities			(5)	(23,000)
Gain (loss) on foreign currency transactions and translations		(356,159)	1,075,215	(290,485)
Financial liabilities at fair value through profit or loss
Income, expense, gains or losses of financial instruments
Gain (loss) on valuation of derivatives		(4,650)	(179,879)	23,225
Gain (loss) on transaction of derivatives		36,046	(27,175)	17,045
Derivative liabilities (using hedge accounting)
Income, expense, gains or losses of financial instruments
Gain (loss) on valuation of derivatives		53,937	(439,559)	5,714
Gain (loss) on transaction of derivatives		37,985	(46,221)	(51,450)
Gain (loss) on valuation of derivatives (equity, before tax)	[1]	₩ (15,029)	₩ 29,431	₩ (3,297)
[1]	Items are included in other comprehensive income or loss. All other income and gain amounts listed above are included in finance income, and all expense and losses listed above are included in finance expenses in the consolidated statements of comprehensive income or loss.

Restricted Deposits (Details)

Restricted Deposits (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2018	Dec. 31, 2017
Restricted Deposits [Line Items]
Total Restricted Deposits		₩ 1,126,975	₩ 991,634
Cash and Cash Equivalents
Restricted Deposits [Line Items]
Escrow accounts		0	53
Deposits for government project		12,747	15,365
Collateral provided for borrowings		100,998	79,569
Collateral provided for lawsuit		3	2
Deposits for transmission regional support program		4,337	2,320
Decommissioning costs of nuclear power plants		604	0
Financial assets available-for-sale
Restricted Deposits [Line Items]
Decommissioning costs of nuclear power plants		0	214,156
Short-term financial instruments
Restricted Deposits [Line Items]
Bidding guarantees		0	119
Restriction on withdrawal related to 'win-win growth program' for small and medium enterprises		34,000	34,000
Long-term financial instruments
Restricted Deposits [Line Items]
Escrow accounts		69	0
Decommissioning costs of nuclear power plants		245,896	337,234
Guarantee deposits for checking account		0	2
Guarantee deposits for banking accounts at oversea branches		315	302
Funds for developing small and medium enterprises	[1]	200,000	200,000
Current Financial assets at fair value through other comprehensive income
Restricted Deposits [Line Items]
Decommissioning costs of nuclear power plants		29,451	0
Non-Current Financial assets at fair value through other comprehensive income
Restricted Deposits [Line Items]
Decommissioning costs of nuclear power plants		498,555	0
Financial assets at fair value through other comprehensive income
Restricted Deposits [Line Items]
Decommissioning costs of nuclear power plants		₩ 0	₩ 108,512
[1]	Deposits for small and medium enterprise at IBK and others for construction of Bitgaram Energy Valley and support for the high potential businesses as of December 31, 2017 and 2018.

Cash and Cash Equivalents (Deta

Cash and Cash Equivalents (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash and Cash Equivalents [Abstract]
Total cash	₩ 138	₩ 132	₩ 119
Demand Deposit Accounts	927,650	968,966	1,725,785
Short-term deposits, classified as cash equivalents	211,424	559,239	120,594
Short-term investments, classified as cash equivalents	219,133	841,402	1,204,855
Total cash and cash equivalents	₩ 1,358,345	₩ 2,369,739	₩ 3,051,353	₩ 3,783,065

Trade and Other Receivables - T

Trade and Other Receivables - Trade and other receivables (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Trade and other current receivables [Abstract]
Trade receivables	₩ 7,087,290	₩ 7,325,702
Other receivables	706,302	603,270
Non-trade receivables	278,647	305,057
Accrued income	102,023	54,002
Deposits	226,439	226,574
Finance lease receivables	84,397	13,067
Others	14,796	4,570
Subtotal of current tade and other receivables	7,793,592	7,928,972
Trade and other non-current receivables [Abstract]
Trade receivables	414,777	448,777
Other non-current receivables	1,405,068	1,306,020
Non-trade receivables	58,957	53,866
Accrued income		182
Deposits	369,310	324,917
Finance lease receivables	897,816	849,554
Others	78,985	77,501
Subtotal of non-current tade and other receivables	1,819,845	1,754,797
Other receivables	2,111,370	1,909,290
Gross amount
Trade and other current receivables [Abstract]
Trade receivables	7,303,065	7,499,285
Other receivables	728,560	614,212
Non-trade receivables	298,587	314,256
Accrued income	102,023	54,002
Deposits	228,466	228,317
Finance lease receivables	84,688	13,067
Others	14,796	4,570
Subtotal of current tade and other receivables	8,031,625	8,113,497
Trade and other non-current receivables [Abstract]
Trade receivables	415,318	449,191
Other non-current receivables	1,496,464	1,380,983
Non-trade receivables	136,432	112,983
Accrued income		182
Deposits	376,211	331,071
Finance lease receivables	898,658	849,554
Others	85,163	87,193
Subtotal of non-current tade and other receivables	1,911,782	1,830,174
Other receivables	2,225,024	1,995,195
Allowance for doubtful accounts
Trade and other current receivables [Abstract]
Trade receivables	(215,775)	(173,583)
Other receivables	(20,231)	(9,199)
Non-trade receivables	(19,940)	(9,199)
Accrued income	0	0
Deposits	0	0
Finance lease receivables	(291)	0
Others	0	0
Subtotal of current tade and other receivables	(236,006)	(182,782)
Trade and other non-current receivables [Abstract]
Trade receivables	(93)	0
Other non-current receivables	(84,495)	(68,809)
Non-trade receivables	(77,475)	(59,117)
Accrued income		0
Deposits	0	0
Finance lease receivables	(842)	0
Others	(6,178)	(9,692)
Subtotal of non-current tade and other receivables	(84,588)	(68,809)
Other receivables	(104,726)	(78,008)
Present value discount
Trade and other current receivables [Abstract]
Trade receivables	0	0
Other receivables	(2,027)	(1,743)
Non-trade receivables	0	0
Accrued income	0	0
Deposits	(2,027)	(1,743)
Finance lease receivables	0	0
Others	0	0
Subtotal of current tade and other receivables	(2,027)	(1,743)
Trade and other non-current receivables [Abstract]
Trade receivables	(448)	(414)
Other non-current receivables	(6,901)	(6,154)
Non-trade receivables	0	0
Accrued income		0
Deposits	(6,901)	(6,154)
Finance lease receivables	0	0
Others	0	0
Subtotal of non-current tade and other receivables	(7,349)	(6,568)
Other receivables	₩ (8,928)	₩ (7,897)

Trade and Other Receivables - O

Trade and Other Receivables - Other receivables (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Trade and Other Receivables [Line Items]
Trade receivables	₩ 7,502,067	₩ 7,774,479
Other receivables	2,111,370	1,909,290
Gross amount
Trade and Other Receivables [Line Items]
Trade receivables	7,718,383	7,948,476
Other receivables	2,225,024	1,995,195
Current
Trade and Other Receivables [Line Items]
Trade receivables	7,419,648	7,698,604
Other receivables	2,075,601	1,810,075
Less than 60 days
Trade and Other Receivables [Line Items]
Trade receivables	0	7,117
Other receivables	0	47,532
Trade and Other receivables: (impairment reviewed)
Trade and Other Receivables [Line Items]
Trade receivables	298,735	242,755
Other receivables	149,423	137,588
Less than 60 days
Trade and Other Receivables [Line Items]
Trade receivables	2,525	0
Other receivables	24,782	0
60 ~ 90 days
Trade and Other Receivables [Line Items]
Trade receivables	37,266	39,070
Other receivables	1,007	44
90 ~ 120 days
Trade and Other Receivables [Line Items]
Trade receivables	16,033	17,502
Other receivables	10,997	1,017
120 days ~ 1year
Trade and Other Receivables [Line Items]
Trade receivables	46,204	55,242
Other receivables	23,991	11,042
Over 1 year
Trade and Other Receivables [Line Items]
Trade receivables	196,707	130,941
Other receivables	88,646	125,485
Allowance for doubtful accounts
Trade and Other Receivables [Line Items]
Trade receivables	(215,868)	(173,583)
Other receivables	(104,726)	(78,008)
Less: Present value discount
Trade and Other Receivables [Line Items]
Trade receivables	(448)	(414)
Other receivables	₩ (8,928)	₩ (7,897)

Trade and Other Receivables - C

Trade and Other Receivables - Changes in the allowance for doubtful accounts (Details) - KRW (₩) ₩ in Millions	Jan. 01, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Trade receivables
Reconciliation of changes in allowance account for credit losses of financial assets [Line Items]
Beginning balance	₩ 173,583	₩ 173,583	₩ 71,985	₩ 51,956
Effect of change in accounting policy	6,641
Loss allowance as at January 1, 2018 under IFRS 9	180,224
Changes in allowance account for credit losses of financial assets
Bad debt expense		41,498	126,714	38,719
Write-off		(7,696)	(32,995)	(18,939)
Reversal		(1,726)	0	0
Others		3,568	7,879	249
Ending balance		215,868	173,583	71,985
Other receivables
Reconciliation of changes in allowance account for credit losses of financial assets [Line Items]
Beginning balance	78,008	78,008	87,661	91,746
Effect of change in accounting policy	128
Loss allowance as at January 1, 2018 under IFRS 9	₩ 78,136
Changes in allowance account for credit losses of financial assets
Bad debt expense		17,817	1,778	233
Write-off		(244)	(3,129)	(928)
Reversal		(143)	(2,166)	(5,489)
Others		9,160	(6,136)	2,099
Ending balance		₩ 104,726	₩ 78,008	₩ 87,661

Financial Assets at Fair Valu_5

Financial Assets at Fair Value through Profit or Loss (Details) ₩ in Millions	Dec. 31, 2018KRW (₩)	[1]
Financial Assets At Fair Value Through Profit Or Loss [Line Items]
Current financial assets at fair value through profit or loss	₩ 313,893
Non-current financial assets at fair value through profit or loss	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	313,893
Non-current financial assets at fair value through profit or loss	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	100	[2]
Non-current financial assets at fair value through profit or loss	320,148	[2]
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	[2]
Non-current financial assets at fair value through profit or loss	5,052	[2]
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	313,793	[3]
Non-current financial assets at fair value through profit or loss	83,586	[3]
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
Non-current financial assets at fair value through profit or loss	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	[3]
Non-current financial assets at fair value through profit or loss	187,483	[3]
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
Non-current financial assets at fair value through profit or loss	₩ 10,773
[1]	As of December 31, 2018, the Company invested KRW528,006 million exclusively for payment of decommissioning costs of nuclear power plants.
[2]	For the year ended December 31, 2017, the Company had designated the financial assets as available-for-sale (note 2.(5)).
[3]	For the year ended December 31, 2017, the Company had designated the financial assets as long-term/short-term financial instrument (note 2.(5)).

Changes in financial assets at

Changes in financial assets at fair value through other comprehensive income (Details) ₩ in Millions	12 Months Ended
	Dec. 31, 2018KRW (₩)
Changes in financial assets at fair value through other comprehensive income [Line Items]
Beginning balance	₩ 0
Effect of change in accounting policy	471,903	[1]
Acquisition	0
Disposal	(1)
Valuation	(75,077)
Impairment	0
Others	2,670
Ending Balance	399,495
Listed equity securities
Changes in financial assets at fair value through other comprehensive income [Line Items]
Beginning balance	0
Effect of change in accounting policy	274,453	[1]
Acquisition	0
Disposal	(1)
Valuation	(63,007)
Impairment	0
Others	(1,389)
Ending Balance	210,056
Unlisted equity securities
Changes in financial assets at fair value through other comprehensive income [Line Items]
Beginning balance	0
Effect of change in accounting policy	197,450	[1]
Acquisition	0
Disposal	0
Valuation	(12,070)
Impairment	0
Others	4,059
Ending Balance	189,439	[2]
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
Effect of change in accounting policy	0	[1]
Acquisition	0
Disposal	0
Valuation	0
Impairment	0
Others	0
Ending Balance	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	0
Effect of change in accounting policy	471,903	[1]
Acquisition	0
Disposal	(1)
Valuation	(75,077)
Impairment	0
Others	2,670
Ending Balance	₩ 399,495
[1]	As described in note 2.(5), these financial assets were classified as available-for-sale as of December 31, 2017.
[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.

Financial Assets at Fair Valu_6

Financial Assets at Fair Value through Other Comprehensive Income (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2018		Dec. 31, 2017
Financial assets at fair value through other comprehensive income [Line Items]
Acquisition Cost		₩ 650,513
Book value		399,495		₩ 0
Fair value		399,495
Listed equity securities
Financial assets at fair value through other comprehensive income [Line Items]
Acquisition Cost		365,843
Book value		210,056		0
Fair value		₩ 210,056
Korea District Heating Corp.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		2,264,068
Ownership		19.55%
Acquisition Cost		₩ 173,201
Book value		129,051
Fair value		₩ 129,051
Ssangyong Motor Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		38,568
Ownership		0.03%
Acquisition Cost		₩ 428
Book value		153
Fair value		₩ 153
Korea Line Corp.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		18
Ownership		0.00%
Acquisition Cost		₩ 1
Book value		0
Fair value		₩ 0
Namkwang Engineering & Construction Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		121
Ownership		0.00%
Acquisition Cost		₩ 15
Book value		1
Fair value		₩ 1
Bumyang Construction Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		35
Ownership		0.00%
Acquisition Cost		₩ 2
Book value		0
Fair value		₩ 0
ELCOMTEC Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		32,875
Ownership		0.04%
Acquisition Cost		₩ 217
Book value		61
Fair value		₩ 61
PAN ocean Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,492
Ownership		0.00%
Acquisition Cost		₩ 14
Book value		7
Fair value		₩ 7
Dongbu Corporation
Financial assets at fair value through other comprehensive income [Line Items]
Shares		955
Ownership		0.02%
Acquisition Cost		₩ 12
Book value		7
Fair value		₩ 7
KSP Co., Ltd. [Member]
Financial assets at fair value through other comprehensive income [Line Items]
Shares		22,539
Ownership		0.08%
Acquisition Cost		₩ 24
Book value		32
Fair value		₩ 32
STX Heavy Industries Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		5,057
Ownership		0.13%
Acquisition Cost		₩ 191
Book value		29
Fair value		₩ 29
Codes Combine Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		291
Ownership		0.00%
Acquisition Cost		₩ 1
Book value		1
Fair value		₩ 1
PT Adaro Energy Tbk
Financial assets at fair value through other comprehensive income [Line Items]
Shares		480,000,000
Ownership		1.50%
Acquisition Cost		₩ 71,554
Book value		44,790
Fair value		₩ 44,790
Energy Fuels Inc.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,711,814
Ownership		1.91%
Acquisition Cost		₩ 16,819
Book value		5,435
Fair value		₩ 5,435
Baralaba Coal Company Limited
Financial assets at fair value through other comprehensive income [Line Items]
Shares		99,763
Ownership		0.07%
Acquisition Cost		₩ 18,445
Book value		0
Fair value		₩ 0
Denison Mines Corp.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		58,284,000
Ownership		10.42%
Acquisition Cost		₩ 84,134
Book value		30,122
Fair value		₩ 30,122
Fission 3.0 [Member]
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	75,000
Ownership	[1]	0.14%
Acquisition Cost	[1]	₩ 0
Book value	[1]	13
Fair value	[1]	₩ 13
Fission Uranium Corp.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		800,000
Ownership		0.16%
Acquisition Cost		₩ 785
Book value		354
Fair value		354
Unlisted equity securities
Financial assets at fair value through other comprehensive income [Line Items]
Acquisition Cost	[2]	284,670
Book value		189,439	[2]	₩ 0
Fair value	[2]	₩ 189,439
Intellectual Discovery, Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,000,000
Ownership		8.81%
Acquisition Cost		₩ 5,000
Book value		954
Fair value		₩ 954
Hwan Young Steel Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		10,916
Ownership		0.14%
Acquisition Cost		₩ 1,092
Book value		97
Fair value		₩ 97
SAMBO AUTO. Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		15,066
Ownership		0.02%
Acquisition Cost		₩ 38
Book value		38
Fair value		₩ 38
Mobo Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		504
Ownership		0.00%
Acquisition Cost		₩ 14
Book value		14
Fair value		₩ 14
Dae Kwang Semiconductor Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		589
Ownership		0.07%
Acquisition Cost		₩ 6
Book value		6
Fair value		₩ 6
Sanbon Department Store
Financial assets at fair value through other comprehensive income [Line Items]
Shares		828
Ownership		0.01%
Acquisition Cost		₩ 124
Book value		3
Fair value		₩ 3
Miju Steel Mfg. Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,097
Ownership		0.23%
Acquisition Cost		₩ 50
Book value		50
Fair value		₩ 50
Sungwon Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[3]	117
Ownership	[3]	0.07%
Acquisition Cost	[3]	₩ 15
Book value	[3]	15
Fair value	[3]	₩ 15
Hana Civil Engineering Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		23
Ownership		0.00%
Acquisition Cost		₩ 1
Book value		1
Fair value		₩ 1
KC Development Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		839
Ownership		0.02%
Acquisition Cost		₩ 6
Book value		6
Fair value		₩ 6
IMHWA Corp.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		329
Ownership		0.11%
Acquisition Cost		₩ 5
Book value		5
Fair value		₩ 5
DALIM Special Vehicle Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		58
Ownership		0.08%
Acquisition Cost		₩ 10
Book value		10
Fair value		₩ 10
ASA JEONJU Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		34,846
Ownership		1.34%
Acquisition Cost		₩ 697
Book value		69
Fair value		₩ 69
Moonkyung Silica Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		42
Ownership		0.56%
Acquisition Cost		₩ 0
Book value		0
Fair value		₩ 0
Sungkwang Timber Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		9
Ownership		0.34%
Acquisition Cost		₩ 4
Book value		4
Fair value		₩ 4
Yongbo Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		61
Ownership		0.20%
Acquisition Cost		₩ 3
Book value		3
Fair value		₩ 3
HJ Steel Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		218
Ownership		0.07%
Acquisition Cost		₩ 2
Book value		2
Fair value		₩ 2
KS Remicon Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		12
Ownership		0.04%
Acquisition Cost		₩ 3
Book value		3
Fair value		₩ 3
Joongang Platec Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		3,591
Ownership		0.75%
Acquisition Cost		₩ 72
Book value		35
Fair value		₩ 35
Pyungsan SI Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		434
Ownership		0.01%
Acquisition Cost		₩ 9
Book value		9
Fair value		₩ 9
Samgong Development Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		12
Ownership		0.01%
Acquisition Cost		₩ 7
Book value		7
Fair value		₩ 7
Joongang Development Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		540
Ownership		0.12%
Acquisition Cost		₩ 8
Book value		8
Fair value		₩ 8
AJS Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		12,906
Ownership		0.23%
Acquisition Cost		₩ 32
Book value		32
Fair value		₩ 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
Ownership		0.13%
Acquisition Cost		₩ 9
Book value		9
Fair value		₩ 9
Ilrim Nano Tec Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,520
Ownership		0.07%
Acquisition Cost		₩ 15
Book value		15
Fair value		₩ 15
Youngjin Hi-Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		2,512
Ownership		0.25%
Acquisition Cost		₩ 126
Book value		21
Fair value		₩ 21
Buyoung Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		270
Ownership		0.00%
Acquisition Cost		₩ 3
Book value		3
Fair value		₩ 3
Ilsuk Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		152
Ownership		0.17%
Acquisition Cost		₩ 10
Book value		10
Fair value		₩ 10
Dongyang Telecom Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,760
Ownership		0.01%
Acquisition Cost		₩ 11
Book value		11
Fair value		₩ 11
Jongwon Remicon Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		31
Ownership		0.18%
Acquisition Cost		₩ 13
Book value		13
Fair value		₩ 13
Zyle Daewoo Motor Sales Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		22
Ownership		0.00%
Acquisition Cost		₩ 0
Book value		0
Fair value		₩ 0
Daewoo Development Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		8
Ownership		0.00%
Acquisition Cost		₩ 0
Book value		0
Fair value		₩ 0
Seyang Inc.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		537
Ownership		0.05%
Acquisition Cost		₩ 27
Book value		27
Fair value		₩ 27
Seungri Enterprise Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		93
Ownership		0.05%
Acquisition Cost		₩ 3
Book value		3
Fair value		₩ 3
Onggane Food Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares		5
Ownership		0.07%
Acquisition Cost		₩ 1
Book value		1
Fair value		₩ 1
Shin-E P&C Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,569
Ownership		0.64%
Acquisition Cost		₩ 111
Book value		3
Fair value		₩ 3
Ejung Ad Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		132
Ownership		0.09%
Acquisition Cost		₩ 3
Book value		3
Fair value		₩ 3
Solvus Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,056
Ownership		0.04%
Acquisition Cost		₩ 3
Book value		3
Fair value		₩ 3
Myung Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		89
Ownership		0.05%
Acquisition Cost		₩ 2
Book value		2
Fair value		₩ 2
Shinil Engineering Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		887
Ownership		0.06%
Acquisition Cost		₩ 3
Book value		3
Fair value		₩ 3
Biwang Industry Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares		406
Ownership		0.04%
Acquisition Cost		₩ 2
Book value		2
Fair value		₩ 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
Ownership		0.40%
Acquisition Cost		₩ 26
Book value		26
Fair value		₩ 26
Yuil Industrial Electronics Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		804
Ownership		0.32%
Acquisition Cost		₩ 15
Book value		15
Fair value		₩ 15
DN TEK Inc.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		12,401
Ownership		0.29%
Acquisition Cost		₩ 61
Book value		5
Fair value		₩ 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
Ownership		0.00%
Acquisition Cost		₩ 16
Book value		16
Fair value		₩ 16
Kwang Sung Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		325
Ownership		0.35%
Acquisition Cost		₩ 7
Book value		7
Fair value		₩ 7
Futech Mold Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		274
Ownership		0.27%
Acquisition Cost		₩ 14
Book value		14
Fair value		₩ 14
Woojoo Environment Ind. Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		101
Ownership		0.11%
Acquisition Cost		₩ 13
Book value		13
Fair value		₩ 13
Hyungji Esquire Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		61
Ownership		0.02%
Acquisition Cost		₩ 22
Book value		22
Fair value		₩ 22
Kolmar Pharma Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,426
Ownership		0.01%
Acquisition Cost		₩ 52
Book value		3
Fair value		₩ 3
Morado Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		209
Ownership		0.04%
Acquisition Cost		₩ 2
Book value		2
Fair value		₩ 2
Myung Sung Tex Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		20
Ownership		0.00%
Acquisition Cost		₩ 2
Book value		2
Fair value		₩ 2
Kwang Sung Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		610
Ownership		0.53%
Acquisition Cost		₩ 31
Book value		31
Fair value		₩ 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
Ownership		0.73%
Acquisition Cost		₩ 148
Book value		7
Fair value		₩ 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
Ownership		0.00%
Acquisition Cost		₩ 8
Book value		8
Fair value		₩ 8
Shin Pyung Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		6
Ownership		0.03%
Acquisition Cost		₩ 3
Book value		3
Fair value		₩ 3
JMC Heavy Industries Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		2,724
Ownership		0.10%
Acquisition Cost		₩ 27
Book value		2
Fair value		₩ 2
Najin Steel Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		37
Ownership		0.06%
Acquisition Cost		₩ 5
Book value		5
Fair value		₩ 5
Sinkwang Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,091
Ownership		1.68%
Acquisition Cost		₩ 5
Book value		5
Fair value		₩ 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
Ownership		0.61%
Acquisition Cost		₩ 3
Book value		3
Fair value		₩ 3
Mireco Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		109
Ownership		0.25%
Acquisition Cost		₩ 11
Book value		11
Fair value		₩ 11
L&K Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,615
Ownership		0.60%
Acquisition Cost		₩ 24
Book value		24
Fair value		₩ 24
JO Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,263
Ownership		0.62%
Acquisition Cost		₩ 25
Book value		25
Fair value		₩ 25
Kendae Printing Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		422
Ownership		0.60%
Acquisition Cost		₩ 21
Book value		21
Fair value		₩ 21
Dauning Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		231
Ownership		0.41%
Acquisition Cost		₩ 6
Book value		6
Fair value		₩ 6
Korea Trecision Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		22
Ownership		0.45%
Acquisition Cost		₩ 5
Book value		5
Fair value		₩ 5
Ace Track Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		3,130
Ownership		1.08%
Acquisition Cost		₩ 219
Book value		59
Fair value		₩ 59
Yoo-A Construction Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		105
Ownership		0.20%
Acquisition Cost		₩ 11
Book value		11
Fair value		₩ 11
Dung Hwan Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		531
Ownership		0.02%
Acquisition Cost		₩ 5
Book value		5
Fair value		₩ 5
Hurim Biocell Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,021
Ownership		0.00%
Acquisition Cost		₩ 5
Book value		5
Fair value		₩ 5
Smart Power Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		133,333
Ownership		4.35%
Acquisition Cost		₩ 200
Book value		200
Fair value		₩ 200
Sunjin Power Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		4,941
Ownership		0.92%
Acquisition Cost		₩ 247
Book value		32
Fair value		₩ 32
Haseung Industries Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		55
Ownership		0.62%
Acquisition Cost		₩ 28
Book value		28
Fair value		₩ 28
Beer Yeast Korea Inc.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,388
Ownership		0.43%
Acquisition Cost		₩ 7
Book value		7
Fair value		₩ 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
Ownership		1.16%
Acquisition Cost		₩ 6
Book value		6
Fair value		₩ 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
Ownership		0.09%
Acquisition Cost		₩ 24
Book value		24
Fair value		₩ 24
AceInti Agricultural Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		16
Ownership		0.02%
Acquisition Cost		₩ 5
Book value		5
Fair value		₩ 5
KyungDong Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		130
Ownership		0.01%
Acquisition Cost		₩ 1
Book value		1
Fair value		₩ 1
ChunWon Development Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		193
Ownership		0.19%
Acquisition Cost		₩ 39
Book value		39
Fair value		₩ 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
Ownership		0.03%
Acquisition Cost		₩ 1
Book value		1
Fair value		₩ 1
Korea Minerals Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		191
Ownership		0.05%
Acquisition Cost		₩ 134
Book value		1
Fair value		₩ 1
HyoDong Development Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		119
Ownership		0.15%
Acquisition Cost		₩ 24
Book value		24
Fair value		₩ 24
Haspe Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		652
Ownership		0.55%
Acquisition Cost		₩ 20
Book value		20
Fair value		₩ 20
JoHyun Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		350
Ownership		1.56%
Acquisition Cost		₩ 18
Book value		18
Fair value		₩ 18
KC Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		5,107
Ownership		0.17%
Acquisition Cost		₩ 26
Book value		26
Fair value		₩ 26
SeongJi Industrial Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		41
Ownership		0.05%
Acquisition Cost		₩ 1
Book value		1
Fair value		₩ 1
Dong Yang Metal Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		2,951
Ownership		1.97%
Acquisition Cost		₩ 161
Book value		147
Fair value		₩ 147
Seyang Precision Ind.Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		829
Ownership		0.23%
Acquisition Cost		₩ 41
Book value		41
Fair value		₩ 41
Dooriwon Food System Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		13
Ownership		0.27%
Acquisition Cost		₩ 1
Book value		1
Fair value		₩ 1
ShinShin Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		339
Ownership		1.12%
Acquisition Cost		₩ 17
Book value		17
Fair value		₩ 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
Ownership		0.37%
Acquisition Cost		₩ 6
Book value		6
Fair value		₩ 6
Shinheung petrol. Co. Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		699
Ownership		0.14%
Acquisition Cost		₩ 35
Book value		35
Fair value		₩ 35
Force TEC Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		3,501
Ownership		0.02%
Acquisition Cost		₩ 18
Book value		18
Fair value		₩ 18
Samsung Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		486
Ownership		1.28%
Acquisition Cost		₩ 97
Book value		36
Fair value		₩ 36
Tae Hyung Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		28
Ownership		0.43%
Acquisition Cost		₩ 20
Book value		20
Fair value		₩ 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
Ownership		0.21%
Acquisition Cost		₩ 21
Book value		21
Fair value		₩ 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
Ownership		0.06%
Acquisition Cost		₩ 11
Book value		11
Fair value		₩ 11
Borneo International Furniture Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[4]	4,000
Ownership	[4]	0.16%
Acquisition Cost	[4]	₩ 97
Book value	[4]	13
Fair value	[4]	₩ 13
CJ Paradise Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		24
Ownership		0.02%
Acquisition Cost		₩ 12
Book value		12
Fair value		₩ 12
Han Young Technology Company Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		35
Ownership		0.00%
Acquisition Cost		₩ 0
Book value		0
Fair value		₩ 0
STX Offshore & Shipbuilding Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares		8,622
Ownership		0.25%
Acquisition Cost		₩ 1,078
Book value		1,078
Fair value		₩ 1,078
Ptotronics Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		843
Ownership		0.42%
Acquisition Cost		₩ 84
Book value		6
Fair value		₩ 6
NFT Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		136
Ownership		0.40%
Acquisition Cost		₩ 8
Book value		8
Fair value		₩ 8
Echoroba Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		157
Ownership		0.02%
Acquisition Cost		₩ 3
Book value		3
Fair value		₩ 3
Hyundaitech Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,363
Ownership		0.87%
Acquisition Cost		₩ 27
Book value		27
Fair value		₩ 27
Dasan Material Co.Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		29
Ownership		0.04%
Acquisition Cost		₩ 22
Book value		22
Fair value		₩ 22
Fish World Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		47
Ownership		0.21%
Acquisition Cost		₩ 2
Book value		2
Fair value		₩ 2
SG Shinsung Engineering and Construction Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		10
Ownership		0.00%
Acquisition Cost		₩ 6
Book value		6
Fair value		₩ 6
Samdo Industry Electric Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		48
Ownership		0.02%
Acquisition Cost		₩ 1
Book value		1
Fair value		₩ 1
Taejung Industries Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		9,268
Ownership		0.30%
Acquisition Cost		₩ 5
Book value		5
Fair value		₩ 5
Shinsei Trading Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		64
Ownership		0.72%
Acquisition Cost		₩ 6
Book value		6
Fair value		₩ 6
Dynamic Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		111
Ownership		0.19%
Acquisition Cost		₩ 3
Book value		3
Fair value		₩ 3
Green Alchemy Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		38,202
Ownership		1.48%
Acquisition Cost		₩ 191
Book value		17
Fair value		₩ 17
Youone TBM Engineering & Construction Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		615
Ownership		0.27%
Acquisition Cost		₩ 31
Book value		31
Fair value		₩ 31
KM Leatech
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,648
Ownership		0.98%
Acquisition Cost		₩ 8
Book value		8
Fair value		₩ 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
Ownership		0.80%
Acquisition Cost		₩ 3
Book value		3
Fair value		₩ 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
Ownership		0.00%
Acquisition Cost		₩ 0
Book value		0
Fair value		₩ 0
Enertec Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		7,937
Ownership		0.19%
Acquisition Cost		₩ 44
Book value		44
Fair value		₩ 44
Sangji Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		20
Ownership		0.26%
Acquisition Cost		₩ 4
Book value		4
Fair value		₩ 4
Bellie Doughnuts Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		64
Ownership		0.07%
Acquisition Cost		₩ 4
Book value		4
Fair value		₩ 4
Possbell Engineering Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		36
Ownership		0.64%
Acquisition Cost		₩ 1
Book value		1
Fair value		₩ 1
AIRTECH Information communication Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares		2,379
Ownership		0.60%
Acquisition Cost		₩ 12
Book value		12
Fair value		₩ 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
Ownership		0.35%
Acquisition Cost		₩ 55
Book value		55
Fair value		₩ 55
Kiscom Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,493
Ownership		0.04%
Acquisition Cost		₩ 1
Book value		1
Fair value		₩ 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
Ownership		0.37%
Acquisition Cost		₩ 16
Book value		16
Fair value		₩ 16
Pyung Hwa Industrial Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		3,388
Ownership		3.00%
Acquisition Cost		₩ 85
Book value		85
Fair value		₩ 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
Ownership		10.00%
Acquisition Cost		₩ 18,540
Book value		0
Fair value		₩ 0
Set Holding
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[6]	1,100,220
Ownership	[6]	2.50%
Acquisition Cost	[6]	₩ 229,255
Book value	[6]	161,983
Fair value	[6]	₩ 161,983
PT. Cirebon Energi Prasarana
Financial assets at fair value through other comprehensive income [Line Items]
Shares		22,420
Ownership		10.00%
Acquisition Cost		₩ 2,612
Book value		2,507
Fair value		₩ 2,507
KODE NOVUS 1 LLC
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[7]	0
Ownership	[7]	10.00%
Acquisition Cost	[7]	₩ 0
Book value	[7]	0
Fair value	[7]	₩ 0
Choheung packing Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		61
Ownership		0.13%
Acquisition Cost		₩ 12
Book value		12
Fair value		₩ 12
Jaewoo Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		359
Ownership		0.24%
Acquisition Cost		₩ 11
Book value		11
Fair value		₩ 11
Wooyang HC Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[8]	1,375
Ownership	[8]	0.01%
Acquisition Cost	[8]	₩ 159
Book value	[8]	159
Fair value	[8]	₩ 159
Sungsan Parts Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		629
Ownership		0.80%
Acquisition Cost		₩ 63
Book value		63
Fair value		₩ 63
KMT Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,411
Ownership		0.93%
Acquisition Cost		₩ 21
Book value		21
Fair value		₩ 21
TheYeonriji Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		116
Ownership		0.10%
Acquisition Cost		₩ 6
Book value		6
Fair value		₩ 6
Flusys Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		9
Ownership		0.08%
Acquisition Cost		₩ 2
Book value		2
Fair value		₩ 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
Ownership		0.07%
Acquisition Cost		₩ 16
Book value		16
Fair value		₩ 16
Daewoo Display Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		177
Ownership		0.03%
Acquisition Cost		₩ 5
Book value		5
Fair value		₩ 5
Yeong-gwang Remicon Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		15
Ownership		0.12%
Acquisition Cost		₩ 2
Book value		2
Fair value		₩ 2
NTS Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		143
Ownership		0.22%
Acquisition Cost		₩ 36
Book value		36
Fair value		₩ 36
AID CO.,LTD.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,212
Ownership		0.57%
Acquisition Cost		₩ 36
Book value		36
Fair value		₩ 36
Changwon Eco-friendly farming corporation
Financial assets at fair value through other comprehensive income [Line Items]
Shares		3
Ownership		0.01%
Acquisition Cost		₩ 0
Book value		0
Fair value		₩ 0
Kumo Hitech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		6,697
Ownership		0.53%
Acquisition Cost		₩ 100
Book value		100
Fair value		₩ 100
Kyung Pyo Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		186
Ownership		0.76%
Acquisition Cost		₩ 19
Book value		19
Fair value		₩ 19
Daedong Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		617
Ownership		0.55%
Acquisition Cost		₩ 46
Book value		46
Fair value		₩ 46
Doosung Heavy Industries Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		53
Ownership		0.06%
Acquisition Cost		₩ 5
Book value		5
Fair value		₩ 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
Ownership		0.08%
Acquisition Cost		₩ 3
Book value		3
Fair value		₩ 3
Samkwang Chemical Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		204
Ownership		1.27%
Acquisition Cost		₩ 51
Book value		51
Fair value		₩ 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
Ownership		0.54%
Acquisition Cost		₩ 21
Book value		21
Fair value		₩ 21
Shinseung Chemical Industy Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		5
Ownership		0.01%
Acquisition Cost		₩ 60
Book value		60
Fair value		₩ 60
KJ Alloy Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		368
Ownership		0.20%
Acquisition Cost		₩ 7
Book value		7
Fair value		₩ 7
SM Hi-tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		22
Ownership		0.39%
Acquisition Cost		₩ 22
Book value		22
Fair value		₩ 22
Keum Mun Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,320
Ownership		0.97%
Acquisition Cost		₩ 330
Book value		330
Fair value		₩ 330
Puruen Environment Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		967
Ownership		1.34%
Acquisition Cost		₩ 19
Book value		19
Fair value		₩ 19
Miretech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		9,111
Ownership		0.27%
Acquisition Cost		₩ 18
Book value		18
Fair value		₩ 18
SIE Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		12
Ownership		0.02%
Acquisition Cost		₩ 1
Book value		1
Fair value		₩ 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
Ownership		0.16%
Acquisition Cost		₩ 18
Book value		18
Fair value		₩ 18
Namcheong Corp.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		7,096
Ownership		0.28%
Acquisition Cost		₩ 284
Book value		284
Fair value		₩ 284
Eun Sung Enterprise Co.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,131
Ownership		0.72%
Acquisition Cost		₩ 17
Book value		17
Fair value		₩ 17
Dongdo Basalt Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		182
Ownership		1.50%
Acquisition Cost		₩ 73
Book value		73
Fair value		₩ 73
Shinyoung Textiles Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		523
Ownership		1.01%
Acquisition Cost		₩ 52
Book value		52
Fair value		₩ 52
Bugook Cast Iron Co.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		135
Ownership		0.71%
Acquisition Cost		₩ 14
Book value		14
Fair value		₩ 14
Ilwoo Steel Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		41
Ownership		0.28%
Acquisition Cost		₩ 17
Book value		17
Fair value		₩ 17
Dong-un Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,159
Ownership		6.28%
Acquisition Cost		₩ 81
Book value		81
Fair value		₩ 81
Wongwang Door Corp.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		575
Ownership		1.00%
Acquisition Cost		₩ 29
Book value		29
Fair value		₩ 29
[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), the stock merge (10,000:1) and the stock split (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 cannot 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 during the year ended December 31, 2018.
[7]	As described in note 20, this is reclassified to financial assets at FVOCI due to loss of significant influence of the Company.
[8]	The number of shares owned has changed due to the stock merge (10:1) during the year ended December 31, 2018.

Changes in available-for-sale f

Changes in available-for-sale financial assets (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016
Changes in available-for-sale financial assets [Line Items]
Beginning balance		₩ 1,014,732
Acquisition		233,285
Disposal	[1]	(461,423)
Valuation		5,248
Impairment		(2,713)		₩ (86,703)
Others		(89,296)
Ending balance		699,833		1,014,732
Listed equity securities
Changes in available-for-sale financial assets [Line Items]
Beginning balance		268,171
Acquisition		106
Disposal	[1]	0
Valuation		8,156
Impairment		(97)
Others		(1,883)
Ending balance		274,453		268,171
Unlisted equity securities
Changes in available-for-sale financial assets [Line Items]
Beginning balance		746,561
Acquisition		233,179
Disposal	[1]	(461,423)
Valuation		(2,908)
Impairment		(2,616)
Others		(87,413)
Ending balance		425,380	[2]	746,561
Current Financial assets at fair value through profit or loss, category
Changes in available-for-sale financial assets [Line Items]
Beginning balance		0
Acquisition		0
Disposal	[1]	0
Valuation		0
Impairment		0
Others		0
Ending balance		0		0
Non-Current Financial assets at fair value through profit or loss, category
Changes in available-for-sale financial assets [Line Items]
Beginning balance		1,014,732
Acquisition		233,285
Disposal	[1]	(461,423)
Valuation		5,248
Impairment		(2,713)
Others		(89,296)
Ending balance		₩ 699,833		₩ 1,014,732
[1]	The Company recognized gain and loss on disposal of available-for-sale financial assets amounted to KRW1,130 million and KRW2,343 million, respectively, from the partial sales of Hanwha-KOSEP New Renewable Energy Private Special Assets Investment Trust 1 and others for the year ended December 31, 2017.
[2]	Investments in unlisted equity securities held by the Company for which a quoted market price does not exist in an active market and fair value cannot be measured reliably were measured at cost less impairment, if any.

Available-for-sale Financial _3

Available-for-sale Financial Assets (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2017		Dec. 31, 2016
Available-for-sale financial assets [Line Items]
Acquisition cost		₩ 888,673
Book value		699,833		₩ 1,014,732
Fair value		661,907
Listed equity securities
Available-for-sale financial assets [Line Items]
Acquisition cost		365,891
Book value		274,453		268,171
Fair value		₩ 274,453
Korea District Heating Corp.
Available-for-sale financial assets [Line Items]
Shares		2,264,068
Ownership		19.55%
Acquisition cost		₩ 173,201
Book value		165,277
Fair value		₩ 165,277
Ssangyong Motor Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		38,568
Ownership		0.03%
Acquisition cost		₩ 428
Book value		197
Fair value		₩ 197
Sungjee Construction. Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		10,530
Ownership		0.01%
Acquisition cost		₩ 49
Book value		8
Fair value		₩ 8
Korea Line Corp.
Available-for-sale financial assets [Line Items]
Shares		18
Ownership		0.00%
Acquisition cost		₩ 1
Namkwang Engineering & Construction Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		46
Ownership		0.00%
Acquisition cost		₩ 15
Bumyang Construction Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares	[1]	35
Ownership	[1]	0.00%
Acquisition cost	[1]	₩ 2
ELCOMTEC Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		32,875
Ownership		0.04%
Acquisition cost		₩ 217
Book value		72
Fair value		₩ 72
PAN ocean Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		1,492
Ownership		0.00%
Acquisition cost		₩ 14
Book value		8
Fair value		₩ 8
Dongbu Corporation
Available-for-sale financial assets [Line Items]
Shares	[2]	955
Ownership	[2]	0.02%
Acquisition cost	[2]	₩ 12
Book value	[2]	10
Fair value	[2]	₩ 10
KSP Co., Ltd. [Member]
Available-for-sale financial assets [Line Items]
Shares		6,324
Ownership		0.08%
Acquisition cost		₩ 24
Book value		24
Fair value		₩ 24
STX Heavy Industries Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		35,749
Ownership		0.14%
Acquisition cost		₩ 191
Book value		165
Fair value		₩ 165
PT Adaro Energy Tbk
Available-for-sale financial assets [Line Items]
Shares		480,000,000
Ownership		1.50%
Acquisition cost		₩ 71,554
Book value		70,531
Fair value		₩ 70,531
Energy Fuels Inc.
Available-for-sale financial assets [Line Items]
Shares		1,711,814
Ownership		2.38%
Acquisition cost		₩ 16,819
Book value		3,300
Fair value		₩ 3,300
Baralaba Coal Company Limited
Available-for-sale financial assets [Line Items]
Shares		99,763
Ownership		0.07%
Acquisition cost		₩ 18,445
Book value		22
Fair value		₩ 22
Denison Mines Corp.
Available-for-sale financial assets [Line Items]
Shares		58,284,000
Ownership		10.42%
Acquisition cost		₩ 84,134
Book value		34,292
Fair value		₩ 34,292
Fission 3.0 [Member]
Available-for-sale financial assets [Line Items]
Shares		300,000
Ownership		0.14%
Book value		₩ 15
Fair value		₩ 15
Fission Uranium Corp.
Available-for-sale financial assets [Line Items]
Shares		800,000
Ownership		0.16%
Acquisition cost		₩ 785
Book value		532
Fair value		532
Unlisted equity securities
Available-for-sale financial assets [Line Items]
Acquisition cost	[3]	522,782
Book value		425,380	[3]	₩ 746,561
Fair value	[3]	₩ 387,454
Korea investment - Korea EXIM Bank CERs Private Special Assets Investment Trust I
Available-for-sale financial assets [Line Items]
Shares		1,758,731,002
Ownership		14.18%
Acquisition cost		₩ 1,752
Book value		₩ 571
Troika Overseas Resource Development Private Equity Firm
Available-for-sale financial assets [Line Items]
Shares		13,340,012,100
Ownership		3.66%
Acquisition cost		₩ 13,340
Book value		₩ 1,553
IBK-AUCTUS Green Growth Private Equity firm
Available-for-sale financial assets [Line Items]
Shares		152
Ownership		6.29%
Acquisition cost		₩ 41
Book value		₩ 41
Global Dynasty Overseas Resource Development Private Equity Firm
Available-for-sale financial assets [Line Items]
Shares		2,242,437,289
Ownership		7.46%
Acquisition cost		₩ 2,242
Book value		₩ 2,242
Intellectual Discovery, Ltd.
Available-for-sale financial assets [Line Items]
Shares		1,000,000
Ownership		8.81%
Acquisition cost		₩ 5,000
Book value		₩ 954
Hanwha-KOSEP New Renewable Energy Private Special Assets Investment Trust 1
Available-for-sale financial assets [Line Items]
Shares		4,176,751,013
Ownership		5.00%
Acquisition cost		₩ 4,328
Book value		₩ 4,328
Construction Guarantee
Available-for-sale financial assets [Line Items]
Shares	[4]	571
Ownership	[4]	0.02%
Acquisition cost	[4]	₩ 601
Book value	[4]	833
Fair value	[4]	₩ 833
Plant & Mechanical Contractors Financial Cooperative of Korea
Available-for-sale financial assets [Line Items]
Shares		144
Ownership		0.03%
Acquisition cost		₩ 126
Book value		₩ 126
Fire Guarantee
Available-for-sale financial assets [Line Items]
Shares		40
Ownership		0.01%
Acquisition cost		₩ 20
Book value		₩ 20
Korea Software Financial Cooperative
Available-for-sale financial assets [Line Items]
Shares		5,186
Ownership		1.09%
Acquisition cost		₩ 3,301
Book value		₩ 3,301
Engineering Financial Cooperative
Available-for-sale financial assets [Line Items]
Shares		486
Ownership		0.05%
Acquisition cost		₩ 60
Book value		₩ 60
Electric Contractors Financial Cooperative
Available-for-sale financial assets [Line Items]
Shares		1,000
Ownership		0.04%
Acquisition cost		₩ 216
Book value		₩ 216
Korea Specialty Contractor Financial Cooperative
Available-for-sale financial assets [Line Items]
Shares		476
Ownership		0.01%
Acquisition cost		₩ 417
Book value		₩ 417
Information & Communication Financial Cooperative
Available-for-sale financial assets [Line Items]
Shares		121
Ownership		0.02%
Acquisition cost		₩ 26
Book value		₩ 26
Korea Electric Engineers Association
Available-for-sale financial assets [Line Items]
Shares		400
Ownership		0.24%
Acquisition cost		₩ 40
Book value		40
Samsung investment - Investment Pool for Public funds 1
Available-for-sale financial assets [Line Items]
Acquisition cost	[5]	53,220
Book value	[5]	53,739
Fair value	[5]	53,739
Korea investment - Hanwha KT Master Lease Private Special Investment Trust
Available-for-sale financial assets [Line Items]
Acquisition cost	[5]	26,586
Book value	[5]	26,591
Fair value	[5]	26,591
Kyobo Royal-Class Repo Plus Fixed Income 1Y 2nd
Available-for-sale financial assets [Line Items]
Acquisition cost	[5]	33,000
Book value	[5]	33,008
Fair value	[5]	33,008
Kyobo Royal-Class Repo Plus Fixed Income 2Y 1st
Available-for-sale financial assets [Line Items]
Acquisition cost	[5]	50,000
Book value	[5]	50,399
Fair value	[5]	50,399
Kyobo Royal-Class Repo Plus A1 ABCP 1Y
Available-for-sale financial assets [Line Items]
Acquisition cost	[5]	50,000
Book value	[5]	50,419
Fair value	[5]	₩ 50,419
Hwan Young Steel Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		10,916
Ownership		0.14%
Acquisition cost		₩ 1,092
Book value		₩ 97
SAMBO AUTO. Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		15,066
Ownership		0.02%
Acquisition cost		₩ 38
Book value		₩ 38
Mobo Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		504
Ownership		0.00%
Acquisition cost		₩ 14
Book value		₩ 14
Dae Kwang Semiconductor Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		589
Ownership		0.07%
Acquisition cost		₩ 6
Book value		₩ 6
Sanbon Department Store
Available-for-sale financial assets [Line Items]
Shares		828
Ownership		0.01%
Acquisition cost		₩ 124
Book value		₩ 3
Miju Steel Mfg. Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		99,804
Ownership		0.23%
Acquisition cost		₩ 50
Book value		₩ 50
Sungwon Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		589
Ownership		0.07%
Acquisition cost		₩ 15
Book value		₩ 15
Hana Civil Engineering Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		23
Ownership		0.00%
Acquisition cost		₩ 1
Book value		₩ 1
KC Development Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		839
Ownership		0.02%
Acquisition cost		₩ 6
Book value		₩ 6
IMHWA Corp.
Available-for-sale financial assets [Line Items]
Shares		329
Ownership		0.11%
Acquisition cost		₩ 5
Book value		₩ 5
DALIM Special Vehicle Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		58
Ownership		0.08%
Acquisition cost		₩ 10
Book value		₩ 10
ASA JEONJU Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		34,846
Ownership		1.34%
Acquisition cost		₩ 697
Book value		₩ 69
Moonkyung Silica Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		42
Ownership		0.56%
Sungkwang Timber Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		9
Ownership		0.34%
Acquisition cost		₩ 4
Book value		₩ 4
Yongbo Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		61
Ownership		0.20%
Acquisition cost		₩ 3
Book value		₩ 3
HJ Steel Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		218
Ownership		0.07%
Acquisition cost		₩ 2
Book value		₩ 2
KS Remicon Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		12
Ownership		0.04%
Acquisition cost		₩ 3
Book value		₩ 3
Joongang Platec Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		3,591
Ownership		0.75%
Acquisition cost		₩ 72
Book value		₩ 35
Pyungsan SI Ltd.
Available-for-sale financial assets [Line Items]
Shares		434
Ownership		0.01%
Acquisition cost		₩ 9
Book value		₩ 9
Samgong Development Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		12
Ownership		0.01%
Acquisition cost		₩ 7
Book value		₩ 7
Joongang Development Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		540
Ownership		0.12%
Acquisition cost		₩ 8
Book value		₩ 8
AJS Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		12,906
Ownership		0.23%
Acquisition cost		₩ 32
Book value		₩ 32
SHIN-E B&P Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		119
Ownership		0.13%
Acquisition cost		₩ 10
Book value		₩ 10
MSE Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		429
Ownership		0.13%
Acquisition cost		₩ 9
Book value		₩ 9
Ilrim Nano Tec Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		1,520
Ownership		0.07%
Acquisition cost		₩ 15
Book value		₩ 15
Youngjin Hi-Tech Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		2,512
Ownership		0.25%
Acquisition cost		₩ 126
Book value		₩ 21
Buyoung Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		270
Ownership		0.00%
Acquisition cost		₩ 3
Book value		₩ 3
Ilsuk Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		152
Ownership		0.17%
Acquisition cost		₩ 10
Book value		₩ 10
Dongyang Telecom Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		1,760
Ownership		0.01%
Acquisition cost		₩ 11
Book value		₩ 11
Jongwon Remicon Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		31
Ownership		0.18%
Acquisition cost		₩ 13
Book value		₩ 13
Ace Heat Treating Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		477
Ownership		1.43%
Acquisition cost		₩ 72
Book value		₩ 72
Zyle Daewoo Motor Sales Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		22
Ownership		0.00%
Daewoo Development Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		8
Ownership		0.00%
Seyang Inc.
Available-for-sale financial assets [Line Items]
Shares		537
Ownership		0.05%
Acquisition cost		₩ 27
Book value		₩ 27
Seungri Enterprise Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		93
Ownership		0.05%
Acquisition cost		₩ 3
Book value		₩ 3
Onggane Food Co., Ltd
Available-for-sale financial assets [Line Items]
Shares		5
Ownership		0.07%
Acquisition cost		₩ 1
Book value		₩ 1
Shin-E P&C Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		12
Ownership		0.00%
Acquisition cost		₩ 1
Book value		₩ 1
Ejung Ad Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		132
Ownership		0.09%
Acquisition cost		₩ 3
Book value		₩ 3
Solvus Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		1,056
Ownership		0.04%
Acquisition cost		₩ 3
Book value		₩ 3
Myung Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		89
Ownership		0.05%
Acquisition cost		₩ 2
Book value		₩ 2
Shinil Engineering Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		887
Ownership		0.06%
Acquisition cost		₩ 3
Book value		₩ 3
Biwang Industry Co., Ltd
Available-for-sale financial assets [Line Items]
Shares		406
Ownership		0.04%
Acquisition cost		₩ 2
Book value		₩ 2
Huimun Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		263
Ownership		0.26%
Acquisition cost		₩ 4
Book value		₩ 4
Young Sung Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		89
Ownership		0.40%
Acquisition cost		₩ 26
Book value		₩ 26
Yuil Industrial Electronics Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		804
Ownership		0.32%
Acquisition cost		₩ 15
Book value		₩ 15
DN TEK Inc.
Available-for-sale financial assets [Line Items]
Shares		12,401
Ownership		0.29%
Acquisition cost		₩ 61
Book value		₩ 5
Kwang Jin Structure Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		3,072
Ownership		0.60%
Acquisition cost		₩ 31
Book value		₩ 31
Woojin Industry Corporation
Available-for-sale financial assets [Line Items]
Shares		3
Ownership		0.00%
Acquisition cost		₩ 16
Book value		₩ 16
Kwang Sung Industry Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		325
Ownership		0.35%
Acquisition cost		₩ 7
Book value		₩ 7
Futech Mold Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		274
Ownership		0.27%
Acquisition cost		₩ 14
Book value		₩ 14
Woojoo Environment Ind. Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		101
Ownership		0.11%
Acquisition cost		₩ 13
Book value		₩ 13
Cheongatti Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		57
Ownership		0.10%
Acquisition cost		₩ 4
Book value		₩ 4
Hyungji Esquire Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		55
Ownership		0.02%
Acquisition cost		₩ 22
Book value		₩ 22
Kolmar Pharma Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		1,426
Ownership		0.01%
Acquisition cost		₩ 52
Book value		₩ 3
Morado Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		209
Ownership		0.04%
Acquisition cost		₩ 2
Book value		₩ 2
Myung Sung Tex Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		20
Ownership		0.00%
Acquisition cost		₩ 2
Book value		₩ 2
Kwang Sung Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		610
Ownership		0.53%
Acquisition cost		₩ 31
Book value		₩ 31
EverTechno. Co.,Ltd.
Available-for-sale financial assets [Line Items]
Shares		29,424
Ownership		0.73%
Acquisition cost		₩ 148
Book value		₩ 7
Autowel Co.,Ltd.
Available-for-sale financial assets [Line Items]
Shares		260
Ownership		0.38%
Acquisition cost		₩ 14
Book value		₩ 14
Woobang Construction Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		8
Ownership		0.00%
Acquisition cost		₩ 8
Book value		₩ 8
Shin Pyung Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		6
Ownership		0.03%
Acquisition cost		₩ 3
Book value		₩ 3
JMC Heavy Industries Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		2,724
Ownership		0.10%
Acquisition cost		₩ 27
Book value		₩ 27
Najin Steel Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		37
Ownership		0.06%
Acquisition cost		₩ 5
Book value		₩ 5
Sinkwang Industry Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		1,091
Ownership		1.68%
Acquisition cost		₩ 5
Book value		₩ 5
Crystal Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		22
Ownership		0.07%
Acquisition cost		₩ 2
Book value		₩ 2
Elephant & Friends Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		563
Ownership		0.61%
Acquisition cost		₩ 3
Book value		₩ 3
Mireco Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		109
Ownership		0.25%
Acquisition cost		₩ 11
Book value		₩ 11
L&K Industry Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		1,615
Ownership		0.60%
Acquisition cost		₩ 24
Book value		₩ 24
JO Tech Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		1,263
Ownership		0.62%
Acquisition cost		₩ 25
Book value		₩ 25
Kendae Printing Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		422
Ownership		0.60%
Acquisition cost		₩ 21
Book value		₩ 21
Dauning Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		231
Ownership		0.41%
Acquisition cost		₩ 6
Book value		₩ 6
Korea Trecision Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		22
Ownership		0.45%
Acquisition cost		₩ 5
Book value		₩ 5
Ace Track Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		3,130
Ownership		1.08%
Acquisition cost		₩ 219
Book value		₩ 59
Taebok Machinery Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		109
Ownership		1.08%
Acquisition cost		₩ 11
Book value		₩ 11
Yoo-A Construction Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		105
Ownership		0.20%
Acquisition cost		₩ 11
Book value		₩ 11
Dung Hwan Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		531
Ownership		0.02%
Acquisition cost		₩ 5
Book value		₩ 5
Hurim Biocell Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		113
Ownership		0.00%
Acquisition cost		₩ 5
Book value		₩ 5
Sunjin Power Tech Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		4,941
Ownership		0.92%
Acquisition cost		₩ 247
Book value		₩ 32
Smart Power Co.,Ltd.
Available-for-sale financial assets [Line Items]
Shares		133,333
Ownership		4.83%
Acquisition cost		₩ 200
Book value		₩ 200
Haseung Industries Co.,Ltd.
Available-for-sale financial assets [Line Items]
Shares		55
Ownership		0.62%
Acquisition cost		₩ 28
Book value		₩ 28
Beer Yeast Korea Inc.
Available-for-sale financial assets [Line Items]
Shares		1,388
Ownership		0.43%
Acquisition cost		₩ 7
Book value		₩ 7
Daeryung Corporation
Available-for-sale financial assets [Line Items]
Shares		207
Ownership		0.19%
Acquisition cost		₩ 10
Book value		₩ 10
Korea Bio Red Ginseng Co.,Ltd.
Available-for-sale financial assets [Line Items]
Shares		194
Ownership		0.09%
Acquisition cost		₩ 10
Book value		₩ 10
ENH Co.,Ltd.
Available-for-sale financial assets [Line Items]
Shares		1,086
Ownership		0.19%
Acquisition cost		₩ 54
Book value		₩ 54
B CON Co.,Ltd.
Available-for-sale financial assets [Line Items]
Shares		96
Ownership		1.16%
Acquisition cost		₩ 6
Book value		₩ 6
Chunil Metal Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		11
Ownership		0.15%
Acquisition cost		₩ 4
Book value		₩ 4
SsangMa Machine Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		4
Ownership		0.05%
Acquisition cost		₩ 1
Book value		₩ 1
SinJin Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		233
Ownership		0.30%
Acquisition cost		₩ 9
Book value		₩ 9
Ace Integration Co., Ltd
Available-for-sale financial assets [Line Items]
Shares		105
Ownership		0.09%
Acquisition cost		₩ 24
Book value		₩ 24
AceInti Agricultural Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		16
Ownership		0.02%
Acquisition cost		₩ 5
Book value		₩ 5
KyungDong Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		130
Ownership		0.01%
Acquisition cost		₩ 1
Book value		₩ 1
ChunWon Development Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		193
Ownership		0.19%
Acquisition cost		₩ 39
Book value		₩ 39
WonIl Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		999
Ownership		0.15%
Acquisition cost		₩ 50
Book value		₩ 50
SungLim Industrial Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		29
Ownership		0.03%
Acquisition cost		₩ 1
Book value		₩ 1
Korea Minerals Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		191
Ownership		0.05%
Acquisition cost		₩ 134
Book value		₩ 1
HyoDong Development Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		119
Ownership		0.15%
Acquisition cost		₩ 24
Book value		₩ 24
Haspe Tech Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		652
Ownership		0.55%
Acquisition cost		₩ 20
Book value		₩ 20
JoHyun Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		350
Ownership		1.56%
Acquisition cost		₩ 18
Book value		₩ 18
KC Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		5,107
Ownership		0.17%
Acquisition cost		₩ 3
Book value		₩ 3
SeongJi Industrial Co.,Ltd.
Available-for-sale financial assets [Line Items]
Shares		41
Ownership		0.05%
Acquisition cost		₩ 1
Book value		₩ 1
Navanakorn Electric Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares	[6]	4,442,800
Ownership	[6]	26.93%
Acquisition cost	[6]	₩ 17,216
Book value	[6]	₩ 16,410
PT. Kedap Saayq
Available-for-sale financial assets [Line Items]
Shares		671
Ownership		10.00%
Acquisition cost		₩ 18,540
Set Holding
Available-for-sale financial assets [Line Items]
Shares	[7]	1,100,220
Ownership	[7]	2.50%
Acquisition cost	[7]	₩ 229,255
Book value	[7]	171,242
Fair value	[7]	₩ 171,242
PT. Cirebon Energi Prasarana
Available-for-sale financial assets [Line Items]
Shares		22,420
Ownership		10.00%
Acquisition cost		₩ 2,612
Book value		₩ 2,401
DongKwang SD, Inc.
Available-for-sale financial assets [Line Items]
Shares		524
Ownership		0.23%
Acquisition cost		₩ 13
Book value		₩ 13
Dong Yang Metal Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		2,951
Ownership		1.97%
Acquisition cost		₩ 15
Book value		₩ 15
Seyang Precision Ind.Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		829
Ownership		0.23%
Acquisition cost		₩ 41
Book value		₩ 41
Dooriwon Food System Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		13
Ownership		0.27%
Acquisition cost		₩ 1
Book value		₩ 1
ShinShin Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		339
Ownership		1.12%
Acquisition cost		₩ 17
Book value		₩ 17
Kitorang Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		165
Ownership		0.24%
Acquisition cost		₩ 49
Book value		₩ 49
Sung Kwang Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		23
Ownership		0.37%
Acquisition cost		₩ 6
Book value		₩ 6
Hyundai Metal Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		3,757
Ownership		5.60%
Acquisition cost		₩ 1,416
Book value		₩ 1,416
Shinheung petrol. Co. Ltd.
Available-for-sale financial assets [Line Items]
Shares		699
Ownership		0.14%
Acquisition cost		₩ 7
Book value		₩ 7
Force TEC Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		3,501
Ownership		0.02%
Acquisition cost		₩ 18
Book value		₩ 18
Haisung Industrial Systems Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		10,751
Ownership		0.24%
Acquisition cost		₩ 54
Book value		₩ 54
Samsung Tech Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		486
Ownership		1.28%
Acquisition cost		₩ 97
Book value		₩ 97
Tae Hyung Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		28
Ownership		0.43%
Acquisition cost		₩ 20
Book value		₩ 20
Samyangplant Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		323
Ownership		0.60%
Acquisition cost		₩ 16
Book value		₩ 16
Younil Metal Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		41
Ownership		0.21%
Acquisition cost		₩ 21
Book value		₩ 21
Myungjin Tech Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		20
Ownership		0.54%
Acquisition cost		₩ 4
Book value		₩ 4
Hankook Machine Tools Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		719
Ownership		0.14%
Acquisition cost		₩ 72
Book value		₩ 72
Hankook Precision Ind Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		110
Ownership		0.06%
Acquisition cost		₩ 11
Book value		₩ 11
Borneo International Furniture Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		64,037
Ownership		0.28%
Acquisition cost		₩ 97
Book value		₩ 14
CJ Paradise Co.,Ltd.
Available-for-sale financial assets [Line Items]
Shares		24
Ownership		0.02%
Acquisition cost		₩ 12
Book value		₩ 12
Han Young Technology Company Co.,Ltd.
Available-for-sale financial assets [Line Items]
Shares		35
Ownership		0.00%
Jungdo Aluminium Co.,Ltd.
Available-for-sale financial assets [Line Items]
Shares		8,527
Ownership		0.35%
Acquisition cost		₩ 128
Book value		₩ 128
Ilheung Metal Co, Ltd.
Available-for-sale financial assets [Line Items]
Shares		280
Ownership		0.83%
Acquisition cost		₩ 28
Book value		₩ 28
STX Offshore & Shipbuilding Co., Ltd
Available-for-sale financial assets [Line Items]
Shares		8,622
Ownership		0.25%
Acquisition cost		₩ 1,078
Book value		₩ 1,078
Ptotronics Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		151
Ownership		0.07%
Acquisition cost		₩ 2
Book value		₩ 2
NFT Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		136
Ownership		0.40%
Acquisition cost		₩ 8
Book value		₩ 8
Echoroba Co.,Ltd.
Available-for-sale financial assets [Line Items]
Shares		157
Ownership		0.02%
Acquisition cost		₩ 3
Book value		₩ 3
Hyundaitech Co.,Ltd.
Available-for-sale financial assets [Line Items]
Shares		1,363
Ownership		0.87%
Acquisition cost		₩ 27
Book value		₩ 27
Eco Alux Co.,Ltd.
Available-for-sale financial assets [Line Items]
Shares		239
Ownership		0.22%
Acquisition cost		₩ 48
Book value		₩ 48
Daekyung Industry Co.,Ltd.
Available-for-sale financial assets [Line Items]
Shares		9,112
Ownership		0.94%
Acquisition cost		₩ 13
Book value		₩ 13
Dasan Material Co.Ltd.
Available-for-sale financial assets [Line Items]
Shares		29
Ownership		0.04%
Fish World Co.,Ltd.
Available-for-sale financial assets [Line Items]
Shares		47
Ownership		0.21%
Acquisition cost		₩ 2
Book value		₩ 2
SG Shinsung Engineering and Construction Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		10
Ownership		0.00%
Acquisition cost		₩ 6
Book value		₩ 6
Samdo Industry Electric Co.,Ltd.
Available-for-sale financial assets [Line Items]
Shares		48
Ownership		0.02%
Acquisition cost		₩ 1
Book value		₩ 1
Taejung Industries Co.,Ltd.
Available-for-sale financial assets [Line Items]
Shares		9,268
Ownership		0.30%
Acquisition cost		₩ 5
Book value		₩ 5
Shinsei Trading Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		64
Ownership		0.72%
Acquisition cost		₩ 1
Book value		₩ 1
Dynamic Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		111
Ownership		0.19%
Acquisition cost		₩ 3
Book value		₩ 3
Green Alchemy Co.,Ltd.
Available-for-sale financial assets [Line Items]
Shares		38,202
Ownership		1.48%
Acquisition cost		₩ 191
Book value		₩ 191
IQ Power Asia Inc.
Available-for-sale financial assets [Line Items]
Shares		16,179
Ownership		0.31%
Acquisition cost		₩ 81
Book value		₩ 81
Youone TBM Engineering & Construction Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		227,854
Ownership		0.27%
Acquisition cost		₩ 31
Book value		₩ 31
KM Leatech
Available-for-sale financial assets [Line Items]
Shares		1,648
Ownership		0.98%
Acquisition cost		₩ 8
Book value		₩ 8
Wonil T&I Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares		229
Ownership		0.17%
Acquisition cost		₩ 23
Book value		₩ 23
Semist Co.,Ltd.
Available-for-sale financial assets [Line Items]
Shares		555
Ownership		0.80%
Acquisition cost		₩ 3
Book value		₩ 3
DS POWER Co., Ltd.
Available-for-sale financial assets [Line Items]
Shares	[8]	580,000
Ownership	[8]	2.34%
Acquisition cost	[8]	₩ 2,900
Book value	[8]	1,223
Fair value	[8]	₩ 1,223
[1]	The number of shares increased due to the stock split (5:1).
[2]	The number of shares owned has changed due to the stock merge (9:7) during the year ended December 31, 2017.
[3]	Investments in unlisted equity securities held by the Company for which a quoted market price does not exist in an active market and fair value cannot be measured reliably were measured at cost less impairment, if any.
[4]	The Company has estimated the fair value of the investment in Construction Guarantee based upon the price which would be applied when the investment is returned. The Company has recognized the difference between its fair value and book value as a gain or loss on valuation of available-for-sale financial assets in other comprehensive income or loss during the year ended December 31, 2017.
[5]	As of December 31, 2017, the Company invested in KRW214,156 million as beneficiary securities exclusively for payment of decommissioning cost of nuclear power plants. The Company has measured the fair value of the beneficiary securities based on its net asset value.
[6]	Although the Company holds more than 20% of the equity shares of these investments, the Company cannot exercise significant influence.
[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, 2017.
[8]	As described in note 20, this is reclassified to available-for-sale financial assets due to loss of significant influence of the Company.

Financial Assets at Amortized_3

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

Held-to-maturity Investments (D

Held-to-maturity Investments (Details) ₩ in Millions	12 Months Ended
	Dec. 31, 2017KRW (₩)
Changes in held-to-maturity investments [Line Items]
Beginning balance	₩ 3,244
Acquisitions	250
Disposals	(350)
Others	0
Ending balance	3,144
Government bonds
Changes in held-to-maturity investments [Line Items]
Beginning balance	3,244
Acquisitions	250
Disposals	(350)
Others	0
Ending balance	₩ 3,144

Held-to-maturity Investments -

Held-to-maturity Investments - Liquidity classification (Details) ₩ in Millions	12 Months Ended
	Dec. 31, 2017KRW (₩)
Changes in held-to-maturity investments [Line Items]
Beginning balance	₩ 3,244
Acquisitions	250
Disposals	(350)
Others	0
Ending balance	3,144
Current Held to maturity Investments
Changes in held-to-maturity investments [Line Items]
Beginning balance	114
Acquisitions	0
Disposals	(113)
Others	4
Ending balance	5
NonCurrent Held to maturity Investments
Changes in held-to-maturity investments [Line Items]
Beginning balance	3,130
Acquisitions	250
Disposals	(237)
Others	(4)
Ending balance	₩ 3,139

Derivative Instrument (Details)

Derivative Instrument (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Derivative [Line Items]
Current derivative financial assets	₩ 42,107		₩ 12,935		₩ 193,283
Non-current derivative financial assets	60,228		19,691		588,091
Current derivative financial liabilities	20,431		71,267		3,251
Non-current derivative financial liabilities	291,732		356,792		135,435
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)	153,203		(874,667)		288,068
Net income effects of transaction gain (loss)	147,297		(168,961)		(56,438)
Accumulated other comprehensive income (loss)	(6,429)	[1]	31,884		46,750
Currency forward
Derivative [Line Items]
Current derivative financial assets	2,128		45		8,370
Non-current derivative financial assets	12,606		0		32,806
Current derivative financial liabilities	1,956		7,862		1,153
Non-current derivative financial liabilities	0		1,278		34
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)	12,632		(41,889)		15,993
Net income effects of transaction gain (loss)	23,991		(28,223)		4,266
Accumulated other comprehensive income (loss)	0	[1]	0		0
Currency swap
Derivative [Line Items]
Current derivative financial assets	39,979		12		184,913
Non-current derivative financial assets	43,436		15,711		540,057
Current derivative financial liabilities	14,881		61,997		0
Non-current derivative financial liabilities	233,690		296,098		56,612
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)	145,088		(843,747)		253,035
Net income effects of transaction gain (loss)	123,670		(137,376)		(68,266)
Accumulated other comprehensive income (loss)	(12,516)	[1]	26,810		40,031
Interest rate swap
Derivative [Line Items]
Current derivative financial assets	0		0		0
Non-current derivative financial assets	2,342		2,697		4,705
Current derivative financial liabilities	1,439		1,408		2,098
Non-current derivative financial liabilities	58,042		59,416		78,789
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)	(2,949)		6,909		8,517
Net income effects of transaction gain (loss)	(364)		(3,362)		7,562
Accumulated other comprehensive income (loss)	6,087	[1]	5,074		6,719
Others
Derivative [Line Items]
Current derivative financial assets	0	[2]	12,878	[2]	0
Non-current derivative financial assets	1,844	[2]	1,283	[2]	10,523
Current derivative financial liabilities	2,155	[3]	0	[3]	0
Non-current derivative financial liabilities	0	[3]	0	[3]	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)	(1,568)		4,060		10,523
Net income effects of transaction gain (loss)	0		0		0
Accumulated other comprehensive income (loss)	₩ 0	[1]	₩ 0		₩ 0
[1]	For the year ended December 31, 2018, the net gain on valuation of derivatives applying cash flow hedge accounting of KRW211 million, net of tax, is included in other comprehensive income or loss.
[2]	The Company has a put option to sell shares of DS POWER Co., Ltd. and the fair value of the option is recorded in 'Others'.
[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'.

Derivative Currency swap forwar

Derivative Currency swap forward contract List (Details) - 12 months ended Dec. 31, 2018 - Currency forward contracts $ in Thousands, ₩ in Millions	KRW (₩)	USD ($)
Disclosure of Derivative Currency forward contract detail list [Line Items]
Counterparty	KEB Hana Bank	KEB Hana Bank
Contract date	Apr. 10, 2014	Apr. 10, 2014
Matrurity date	Jul. 12, 2021	Jul. 12, 2021
Contract Amount Pay | ₩	₩ 55,120
Contract Amount Receive | $		$ 52,000
Contract exchange rate	1,060	1,060
Counterparty	KEB Hana Bank	KEB Hana Bank
Contract date	Apr. 28, 2014	Apr. 28, 2014
Matrurity date	Jul. 12, 2021	Jul. 12, 2021
Contract Amount Pay | ₩	₩ 50,784
Contract Amount Receive | $		$ 48,000
Contract exchange rate	1,058	1,058
Counterparty	Bank of America	Bank of America
Contract date	Apr. 29, 2014	Apr. 29, 2014
Matrurity date	Jul. 12, 2021	Jul. 12, 2021
Contract Amount Pay | ₩	₩ 105,400
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,054	1,054
Counterparty	KEB Hana Bank	KEB Hana Bank
Contract date	May 9, 2014	May 9, 2014
Matrurity date	Jul. 12, 2021	Jul. 12, 2021
Contract Amount Pay | ₩	₩ 104,600
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,046	1,046
Counterparty	KEB Hana Bank	KEB Hana Bank
Contract date	Dec. 22, 2017	Dec. 22, 2017
Matrurity date	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
Counterparty	Korea Development Bank	Korea Development Bank
Contract date	Dec. 27, 2017	Dec. 27, 2017
Matrurity date	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
Counterparty	Mizuho Bank	Mizuho Bank
Contract date	Nov. 28, 2018	Nov. 28, 2018
Matrurity date	Jan. 2, 2019	Jan. 2, 2019
Contract Amount Pay | ₩	₩ 6,768
Contract Amount Receive | $		$ 6,000
Contract exchange rate	1,127.95	1,127.95
Counterparty	Mizuho Bank	Mizuho Bank
Contract date	Dec. 7, 2018	Dec. 7, 2018
Matrurity date	Jan. 11, 2019	Jan. 11, 2019
Contract Amount Pay | ₩	₩ 11,169
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,116.90	1,116.90
Counterparty	CCB	CCB
Contract date	Dec. 11, 2018	Dec. 11, 2018
Matrurity date	Jan. 14, 2019	Jan. 14, 2019
Contract Amount Pay | ₩	₩ 11,280
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,127.96	1,127.96
Counterparty	Nonghyup Bank	Nonghyup Bank
Contract date	Dec. 17, 2018	Dec. 17, 2018
Matrurity date	Jan. 22, 2019	Jan. 22, 2019
Contract Amount Pay | ₩	₩ 11,295
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,129.45	1,129.45
Counterparty	Korea Development Bank	Korea Development Bank
Contract date	Dec. 18, 2018	Dec. 18, 2018
Matrurity date	Jan. 22, 2019	Jan. 22, 2019
Contract Amount Pay | ₩	₩ 11,279
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,127.85	1,127.85
Counterparty	Morgan Stanley	Morgan Stanley
Contract date	Dec. 19, 2018	Dec. 19, 2018
Matrurity date	Jan. 23, 2019	Jan. 23, 2019
Contract Amount Pay | ₩	₩ 11,233
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,123.30	1,123.30
Counterparty	Standard Chartered	Standard Chartered
Contract date	Dec. 19, 2018	Dec. 19, 2018
Matrurity date	Jan. 24, 2019	Jan. 24, 2019
Contract Amount Pay | ₩	₩ 11,235
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,123.50	1,123.50
Counterparty	Kookmin Bank	Kookmin Bank
Contract date	Dec. 20, 2018	Dec. 20, 2018
Matrurity date	Jan. 28, 2019	Jan. 28, 2019
Contract Amount Pay | ₩	₩ 11,273
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,127.25	1,127.25
Counterparty	Woori Bank	Woori Bank
Contract date	Dec. 20, 2018	Dec. 20, 2018
Matrurity date	Jan. 28, 2019	Jan. 28, 2019
Contract Amount Pay | ₩	₩ 11,272
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,127.15	1,127.15
Counterparty	KEB Hana Bank	KEB Hana Bank
Contract date	Dec. 21, 2018	Dec. 21, 2018
Matrurity date	Jan. 29, 2019	Jan. 29, 2019
Contract Amount Pay | ₩	₩ 13,459
Contract Amount Receive | $		$ 12,000
Contract exchange rate	1,121.60	1,121.60
Counterparty	Morgan Stanley	Morgan Stanley
Contract date	Dec. 24, 2018	Dec. 24, 2018
Matrurity date	Jan. 30, 2019	Jan. 30, 2019
Contract Amount Pay | ₩	₩ 11,289
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,128.87	1,128.87
Counterparty	CCB	CCB
Contract date	Dec. 26, 2018	Dec. 26, 2018
Matrurity date	Jan. 31, 2019	Jan. 31, 2019
Contract Amount Pay | ₩	₩ 11,246
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,124.60	1,124.60
Counterparty	Standard Chartered	Standard Chartered
Contract date	Dec. 26, 2018	Dec. 26, 2018
Matrurity date	Jan. 31, 2019	Jan. 31, 2019
Contract Amount Pay | ₩	₩ 5,624
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,124.75	1,124.75
Counterparty	Nonghyup Bank	Nonghyup Bank
Contract date	Dec. 27, 2018	Dec. 27, 2018
Matrurity date	Feb. 1, 2019	Feb. 1, 2019
Contract Amount Pay | ₩	₩ 5,610
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,121.90	1,121.90
Counterparty	KEB Hana Bank	KEB Hana Bank
Contract date	Dec. 27, 2018	Dec. 27, 2018
Matrurity date	Feb. 1, 2019	Feb. 1, 2019
Contract Amount Pay | ₩	₩ 5,606
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,121.15	1,121.15
Counterparty	Standard Chartered	Standard Chartered
Contract date	Dec. 28, 2018	Dec. 28, 2018
Matrurity date	Feb. 7, 2019	Feb. 7, 2019
Contract Amount Pay | ₩	₩ 5,589
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,117.80	1,117.80
Counterparty	KEB Hana Bank	KEB Hana Bank
Contract date	Dec. 28, 2018	Dec. 28, 2018
Matrurity date	Feb. 7, 2019	Feb. 7, 2019
Contract Amount Pay | ₩	₩ 5,584
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,116.70	1,116.70
Counterparty	Mizuho Bank	Mizuho Bank
Contract date	Dec. 28, 2018	Dec. 28, 2018
Matrurity date	Feb. 7, 2019	Feb. 7, 2019
Contract Amount Pay | ₩	₩ 11,172
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,117.15	1,117.15
Counterparty	Societe Generale	Societe Generale
Contract date	Nov. 29, 2018	Nov. 29, 2018
Matrurity date	Jan. 4, 2019	Jan. 4, 2019
Contract Amount Pay | ₩	₩ 11,206
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,120.60	1,120.60
Counterparty	ING Bank	ING Bank
Contract date	Dec. 20, 2018	Dec. 20, 2018
Matrurity date	Jan. 15, 2019	Jan. 15, 2019
Contract Amount Pay | ₩	₩ 11,279
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,127.89	1,127.89
Counterparty	ING Bank	ING Bank
Contract date	Dec. 26, 2018	Dec. 26, 2018
Matrurity date	Jan. 23, 2019	Jan. 23, 2019
Contract Amount Pay | ₩	₩ 11,248
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,124.77	1,124.77
Counterparty	Nova Scotia	Nova Scotia
Contract date	Dec. 7, 2018	Dec. 7, 2018
Matrurity date	Jan. 10, 2019	Jan. 10, 2019
Contract Amount Pay | ₩	₩ 14,518
Contract Amount Receive | $		$ 13,000
Contract exchange rate	1,116.80	1,116.80
Counterparty	Mizuho Bank	Mizuho Bank
Contract date	Dec. 6, 2018	Dec. 6, 2018
Matrurity date	Jan. 4, 2019	Jan. 4, 2019
Contract Amount Pay | ₩	₩ 11,167
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,116.67	1,116.67
Counterparty	Credit Agricole	Credit Agricole
Contract date	Dec. 27, 2018	Dec. 27, 2018
Matrurity date	Jan. 23, 2019	Jan. 23, 2019
Contract Amount Pay | ₩	₩ 11,208
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,120.75	1,120.75
Counterparty	Korea Development Bank	Korea Development Bank
Contract date	Dec. 13, 2018	Dec. 13, 2018
Matrurity date	Jan. 10, 2019	Jan. 10, 2019
Contract Amount Pay | ₩	₩ 4,490
Contract Amount Receive | $		$ 4,000
Contract exchange rate	1,122.60	1,122.60
Counterparty	Korea Development Bank	Korea Development Bank
Contract date	Dec. 24, 2018	Dec. 24, 2018
Matrurity date	Jan. 10, 2019	Jan. 10, 2019
Contract Amount Pay | ₩	₩ 13,497
Contract Amount Receive | $		$ 12,000
Contract exchange rate	1,124.74	1,124.74
Counterparty	Korea Development Bank	Korea Development Bank
Contract date	Dec. 21, 2018	Dec. 21, 2018
Matrurity date	Jan. 15, 2019	Jan. 15, 2019
Contract Amount Pay | ₩	₩ 10,103
Contract Amount Receive | $		$ 9,000
Contract exchange rate	1,122.50	1,122.50
Counterparty	Korea Development Bank	Korea Development Bank
Contract date	Dec. 27, 2018	Dec. 27, 2018
Matrurity date	Jan. 23, 2019	Jan. 23, 2019
Contract Amount Pay | ₩	₩ 11,207
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,120.68	1,120.68
Counterparty	Korea Development Bank	Korea Development Bank
Contract date	Dec. 28, 2018	Dec. 28, 2018
Matrurity date	Jan. 23, 2019	Jan. 23, 2019
Contract Amount Pay | ₩	₩ 13,412
Contract Amount Receive | $		$ 12,000
Contract exchange rate	1,117.64	1,117.64
Counterparty	Societe Generale	Societe Generale
Contract date	Dec. 19, 2018	Dec. 19, 2018
Matrurity date	Jan. 21, 2019	Jan. 21, 2019
Contract Amount Pay | ₩	₩ 7,853
Contract Amount Receive | $		$ 7,000
Contract exchange rate	1,121.85	1,121.85
Counterparty	Societe Generale	Societe Generale
Contract date	Dec. 21, 2018	Dec. 21, 2018
Matrurity date	Jan. 28, 2019	Jan. 28, 2019
Contract Amount Pay | ₩	₩ 8,974
Contract Amount Receive | $		$ 8,000
Contract exchange rate	1,121.75	1,121.75
Counterparty	MUFG	MUFG
Contract date	Dec. 19, 2018	Dec. 19, 2018
Matrurity date	Jan. 21, 2019	Jan. 21, 2019
Contract Amount Pay | ₩	₩ 6,730
Contract Amount Receive | $		$ 6,000
Contract exchange rate	1,121.70	1,121.70
Counterparty	MUFG	MUFG
Contract date	Dec. 28, 2018	Dec. 28, 2018
Matrurity date	Feb. 7, 2019	Feb. 7, 2019
Contract Amount Pay | ₩	₩ 8,929
Contract Amount Receive | $		$ 8,000
Contract exchange rate	1,116.15	1,116.15
Counterparty	Nova Scotia	Nova Scotia
Contract date	Dec. 19, 2018	Dec. 19, 2018
Matrurity date	Jan. 22, 2019	Jan. 22, 2019
Contract Amount Pay | ₩	₩ 4,486
Contract Amount Receive | $		$ 4,000
Contract exchange rate	1,121.50	1,121.50
Counterparty	Nova Scotia	Nova Scotia
Contract date	Dec. 21, 2018	Dec. 21, 2018
Matrurity date	Jan. 28, 2019	Jan. 28, 2019
Contract Amount Pay | ₩	₩ 8,976
Contract Amount Receive | $		$ 8,000
Contract exchange rate	1,121.95	1,121.95
Counterparty	Nova Scotia	Nova Scotia
Contract date	Dec. 27, 2018	Dec. 27, 2018
Matrurity date	Jan. 31, 2019	Jan. 31, 2019
Contract Amount Pay | ₩	₩ 7,832
Contract Amount Receive | $		$ 7,000
Contract exchange rate	1,118.90	1,118.90
Counterparty	Nonghyup Bank	Nonghyup Bank
Contract date	Dec. 28, 2018	Dec. 28, 2018
Matrurity date	Feb. 7, 2019	Feb. 7, 2019
Contract Amount Pay | ₩	₩ 10,041
Contract Amount Receive | $		$ 9,000
Contract exchange rate	1,115.70	1,115.70
Counterparty	BNP Paribas	BNP Paribas
Contract date	Dec. 28, 2018	Dec. 28, 2018
Matrurity date	Feb. 7, 2019	Feb. 7, 2019
Contract Amount Pay | ₩	₩ 8,930
Contract Amount Receive | $		$ 8,000
Contract exchange rate	1,116.30	1,116.30
Counterparty	CCB	CCB
Contract date	Dec. 28, 2018	Dec. 28, 2018
Matrurity date	Feb. 7, 2019	Feb. 7, 2019
Contract Amount Pay | ₩	₩ 7,812
Contract Amount Receive | $		$ 7,000
Contract exchange rate	1,116.05	1,116.05
Counterparty	Credit Agricole	Credit Agricole
Contract date	Dec. 28, 2018	Dec. 28, 2018
Matrurity date	Feb. 7, 2019	Feb. 7, 2019
Contract Amount Pay | ₩	₩ 7,812
Contract Amount Receive | $		$ 7,000
Contract exchange rate	1,115.95	1,115.95
Counterparty	KEB Hana Bank	KEB Hana Bank
Contract date	Dec. 5, 2018	Dec. 5, 2018
Matrurity date	Jan. 7, 2019	Jan. 7, 2019
Contract Amount Pay | ₩	₩ 16,697
Contract Amount Receive | $		$ 15,000
Contract exchange rate	1,113.15	1,113.15
Counterparty	KEB Hana Bank	KEB Hana Bank
Contract date	Dec. 7, 2018	Dec. 7, 2018
Matrurity date	Jan. 7, 2019	Jan. 7, 2019
Contract Amount Pay | ₩	₩ 15,672
Contract Amount Receive | $		$ 14,000
Contract exchange rate	1,119.43	1,119.43
Counterparty	Busan Bank	Busan Bank
Contract date	Dec. 28, 2018	Dec. 28, 2018
Matrurity date	Jan. 7, 2019	Jan. 7, 2019
Contract Amount Pay | ₩	₩ 6,477
Contract Amount Receive | $		$ 5,800
Contract exchange rate	1,116.70	1,116.70
Counterparty	Nonghyup Bank	Nonghyup Bank
Contract date	Dec. 12, 2018	Dec. 12, 2018
Matrurity date	Jan. 7, 2019	Jan. 7, 2019
Contract Amount Pay | ₩	₩ 3,380
Contract Amount Receive | $		$ 3,000
Contract exchange rate	1,126.60	1,126.60
Counterparty	KEB Hana Bank	KEB Hana Bank
Contract date	Dec. 13, 2018	Dec. 13, 2018
Matrurity date	Jan. 15, 2019	Jan. 15, 2019
Contract Amount Pay | ₩	₩ 7,849
Contract Amount Receive | $		$ 7,000
Contract exchange rate	1,121.25	1,121.25
Counterparty	Shinhan Bank	Shinhan Bank
Contract date	Dec. 20, 2018	Dec. 20, 2018
Matrurity date	Jan. 22, 2019	Jan. 22, 2019
Contract Amount Pay | ₩	₩ 29,320
Contract Amount Receive | $		$ 26,000
Contract exchange rate	1,127.68	1,127.68
Counterparty	Nonghyup Bank	Nonghyup Bank
Contract date	Dec. 28, 2018	Dec. 28, 2018
Matrurity date	Feb. 15, 2019	Feb. 15, 2019
Contract Amount Pay | ₩	₩ 53,666
Contract Amount Receive | $		$ 48,000
Contract exchange rate	1,118.05	1,118.05
Counterparty	Credit Agricole	Credit Agricole
Contract date	Nov. 2, 2018	Nov. 2, 2018
Matrurity date	Feb. 7, 2019	Feb. 7, 2019
Contract Amount Pay | ₩	₩ 3,039
Contract Amount Receive | $		$ 2,729
Contract exchange rate	1,113.60	1,113.60
Counterparty	Credit Agricole	Credit Agricole
Contract date	Nov. 5, 2018	Nov. 5, 2018
Matrurity date	Feb. 7, 2019	Feb. 7, 2019
Contract Amount Pay | ₩	₩ 5,564
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,112.70	1,112.70
Counterparty	Nova Scotia	Nova Scotia
Contract date	Nov. 7, 2018	Nov. 7, 2018
Matrurity date	Feb. 13, 2019	Feb. 13, 2019
Contract Amount Pay | ₩	₩ 5,567
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,113.40	1,113.40
Counterparty	Nova Scotia	Nova Scotia
Contract date	Nov. 7, 2018	Nov. 7, 2018
Matrurity date	Feb. 13, 2019	Feb. 13, 2019
Contract Amount Pay | ₩	₩ 4,458
Contract Amount Receive | $		$ 4,000
Contract exchange rate	1,114.40	1,114.40
Counterparty	Societe Generale	Societe Generale
Contract date	Nov. 29, 2018	Nov. 29, 2018
Matrurity date	Mar. 4, 2019	Mar. 4, 2019
Contract Amount Pay | ₩	₩ 5,568
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,113.50	1,113.50
Counterparty	Societe Generale	Societe Generale
Contract date	Nov. 29, 2018	Nov. 29, 2018
Matrurity date	Mar. 4, 2019	Mar. 4, 2019
Contract Amount Pay | ₩	₩ 3,674
Contract Amount Receive | $		$ 3,297
Contract exchange rate	1,114.50	1,114.50
Counterparty	Credit Agricole	Credit Agricole
Contract date	Dec. 3, 2018	Dec. 3, 2018
Matrurity date	Mar. 5, 2019	Mar. 5, 2019
Contract Amount Pay | ₩	₩ 256
Contract Amount Receive | $		$ 231
Contract exchange rate	1,109.10	1,109.10
Counterparty	Nova Scotia	Nova Scotia
Contract date	Dec. 4, 2018	Dec. 4, 2018
Matrurity date	Mar. 6, 2019	Mar. 6, 2019
Contract Amount Pay | ₩	₩ 5,522
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,104.30	1,104.30
Counterparty	Nova Scotia	Nova Scotia
Contract date	Dec. 4, 2018	Dec. 4, 2018
Matrurity date	Mar. 6, 2019	Mar. 6, 2019
Contract Amount Pay | ₩	₩ 5,527
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,105.30	1,105.30
Counterparty	Nova Scotia	Nova Scotia
Contract date	Dec. 20, 2018	Dec. 20, 2018
Matrurity date	Mar. 26, 2019	Mar. 26, 2019
Contract Amount Pay | ₩	₩ 5,589
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,117.80	1,117.80
Counterparty	Nova Scotia	Nova Scotia
Contract date	Dec. 20, 2018	Dec. 20, 2018
Matrurity date	Mar. 26, 2019	Mar. 26, 2019
Contract Amount Pay | ₩	₩ 1,751
Contract Amount Receive | $		$ 1,565
Contract exchange rate	1,118.80	1,118.80
Counterparty	Nova Scotia	Nova Scotia
Contract date	Dec. 28, 2018	Dec. 28, 2018
Matrurity date	Apr. 2, 2019	Apr. 2, 2019
Contract Amount Pay | ₩	₩ 5,565
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,113	1,113
Counterparty	Nova Scotia	Nova Scotia
Contract date	Dec. 28, 2018	Dec. 28, 2018
Matrurity date	Apr. 2, 2019	Apr. 2, 2019
Contract Amount Pay | ₩	₩ 5,569
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,113.80	1,113.80
Counterparty	Nova Scotia	Nova Scotia
Contract date	Dec. 28, 2018	Dec. 28, 2018
Matrurity date	Apr. 2, 2019	Apr. 2, 2019
Contract Amount Pay | ₩	₩ 5,576
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,115.20	1,115.20
Counterparty	Nova Scotia	Nova Scotia
Contract date	Dec. 28, 2018	Dec. 28, 2018
Matrurity date	Apr. 3, 2019	Apr. 3, 2019
Contract Amount Pay | ₩	₩ 5,553
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,110.60	1,110.60
Counterparty	Nova Scotia	Nova Scotia
Contract date	Dec. 28, 2018	Dec. 28, 2018
Matrurity date	Apr. 3, 2019	Apr. 3, 2019
Contract Amount Pay | ₩	₩ 5,558
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,111.60	1,111.60
Counterparty	Nova Scotia	Nova Scotia
Contract date	Dec. 28, 2018	Dec. 28, 2018
Matrurity date	Apr. 3, 2019	Apr. 3, 2019
Contract Amount Pay | ₩	₩ 5,563
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,112.60	1,112.60

Derivative Currency swap contra

Derivative Currency swap contract List (Details) - 12 months ended Dec. 31, 2018 - Currency swap contracts € in Thousands, kr in Thousands, SFr in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, ₩ in Millions	KRW (₩)	USD ($)	EUR (€)	CHF (SFr)	HKD ($)	AUD ($)	SEK (kr)
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Counterparty	Credit Suisse	Credit Suisse	Credit Suisse	Credit Suisse	Credit Suisse	Credit Suisse	Credit Suisse
Contract Amount Pay	₩ 118,632
Contract Amount Receive | SFr				SFr 100,000
Contract exchange rate	1,186.32	1,186.32	1,186.32	1,186.32	1,186.32	1,186.32	1,186.32
Derivative, Term of Contract	2014~2019	2014~2019	2014~2019	2014~2019	2014~2019	2014~2019	2014~2019
Contract Interest rate Pay	2.98%	2.98%	2.98%	2.98%	2.98%	2.98%	2.98%
Contract Interest rate Receive	1.50%	1.50%	1.50%	1.50%	1.50%	1.50%	1.50%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Counterparty	Standard Chartered	Standard Chartered	Standard Chartered	Standard Chartered	Standard Chartered	Standard Chartered	Standard Chartered
Contract Amount Pay	₩ 114,903
Contract Amount Receive | SFr				SFr 100,000
Contract exchange rate	1,149.03	1,149.03	1,149.03	1,149.03	1,149.03	1,149.03	1,149.03
Derivative, Term of Contract	2014~2019	2014~2019	2014~2019	2014~2019	2014~2019	2014~2019	2014~2019
Contract Interest rate Pay	4.00%	4.00%	4.00%	4.00%	4.00%	4.00%	4.00%
Contract Interest rate Receive	1.50%	1.50%	1.50%	1.50%	1.50%	1.50%	1.50%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
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]
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]
Counterparty	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB 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]
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]
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]
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]
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]
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]
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]
Counterparty	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB 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]
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]
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]
Counterparty	HSBC	HSBC	HSBC	HSBC	HSBC	HSBC	HSBC
Contract Amount Pay	₩ 105,260
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,052.60	1,052.60	1,052.60	1,052.60	1,052.60	1,052.60	1,052.60
Derivative, Term of Contract	2014~2019	2014~2019	2014~2019	2014~2019	2014~2019	2014~2019	2014~2019
Contract Interest rate Pay	2.48%	2.48%	2.48%	2.48%	2.48%	2.48%	2.48%
Contract Interest rate Receive	2.38%	2.38%	2.38%	2.38%	2.38%	2.38%	2.38%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Counterparty	Standard Chartered	Standard Chartered	Standard Chartered	Standard Chartered	Standard Chartered	Standard Chartered	Standard Chartered
Contract Amount Pay	₩ 105,260
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,052.60	1,052.60	1,052.60	1,052.60	1,052.60	1,052.60	1,052.60
Derivative, Term of Contract	2014~2019	2014~2019	2014~2019	2014~2019	2014~2019	2014~2019	2014~2019
Contract Interest rate Pay	2.48%	2.48%	2.48%	2.48%	2.48%	2.48%	2.48%
Contract Interest rate Receive	2.38%	2.38%	2.38%	2.38%	2.38%	2.38%	2.38%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
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	₩ 105,260
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,052.60	1,052.60	1,052.60	1,052.60	1,052.60	1,052.60	1,052.60
Derivative, Term of Contract	2016~2019	2016~2019	2016~2019	2016~2019	2016~2019	2016~2019	2016~2019
Contract Interest rate Pay	2.48%	2.48%	2.48%	2.48%	2.48%	2.48%	2.48%
Contract Interest rate Receive	2.38%	2.38%	2.38%	2.38%	2.38%	2.38%	2.38%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
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]
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]
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]
Counterparty	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB 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]
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]
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]
Counterparty	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB 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]
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]
Counterparty	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank
Contract Amount Pay	₩ 115,387
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]
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]
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]
Counterparty	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB 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]
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%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
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]
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]
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	Libor(3M)+1.25%	Libor(3M)+1.25%	Libor(3M)+1.25%	Libor(3M)+1.25%	Libor(3M)+1.25%	Libor(3M)+1.25%	Libor(3M)+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]
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	Libor(3M)+1.25%	Libor(3M)+1.25%	Libor(3M)+1.25%	Libor(3M)+1.25%	Libor(3M)+1.25%	Libor(3M)+1.25%	Libor(3M)+1.25%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
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]
Counterparty	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB 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]
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]
Counterparty	JP Morgan	JP Morgan	JP Morgan	JP Morgan	JP Morgan	JP Morgan	JP Morgan
Contract Amount Pay	₩ 107,190
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,071.90	1,071.90	1,071.90	1,071.90	1,071.90	1,071.90	1,071.90
Derivative, Term of Contract	2014~2019	2014~2019	2014~2019	2014~2019	2014~2019	2014~2019	2014~2019
Contract Interest rate Pay	3M Libor+3.25%	3M Libor+3.25%	3M Libor+3.25%	3M Libor+3.25%	3M Libor+3.25%	3M Libor+3.25%	3M Libor+3.25%
Contract Interest rate Receive	2.75%	2.75%	2.75%	2.75%	2.75%	2.75%	2.75%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Counterparty	Morgan Stanley	Morgan Stanley	Morgan Stanley	Morgan Stanley	Morgan Stanley	Morgan Stanley	Morgan Stanley
Contract Amount Pay	₩ 107,190
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,071.90	1,071.90	1,071.90	1,071.90	1,071.90	1,071.90	1,071.90
Derivative, Term of Contract	2014~2019	2014~2019	2014~2019	2014~2019	2014~2019	2014~2019	2014~2019
Contract Interest rate Pay	3M Libor+3.25%	3M Libor+3.25%	3M Libor+3.25%	3M Libor+3.25%	3M Libor+3.25%	3M Libor+3.25%	3M Libor+3.25%
Contract Interest rate Receive	2.75%	2.75%	2.75%	2.75%	2.75%	2.75%	2.75%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Counterparty	Deutsche Bank	Deutsche Bank	Deutsche Bank	Deutsche Bank	Deutsche Bank	Deutsche Bank	Deutsche Bank
Contract Amount Pay	₩ 107,190
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,071.90	1,071.90	1,071.90	1,071.90	1,071.90	1,071.90	1,071.90
Derivative, Term of Contract	2014~2019	2014~2019	2014~2019	2014~2019	2014~2019	2014~2019	2014~2019
Contract Interest rate Pay	3M Libor+3.25%	3M Libor+3.25%	3M Libor+3.25%	3M Libor+3.25%	3M Libor+3.25%	3M Libor+3.25%	3M Libor+3.25%
Contract Interest rate Receive	2.75%	2.75%	2.75%	2.75%	2.75%	2.75%	2.75%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
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]
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]
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]
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]
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]
Counterparty	Credit Agricole	Credit Agricole	Credit Agricole	Credit Agricole	Credit Agricole	Credit Agricole	Credit Agricole
Contract Amount Pay	₩ 118,343
Contract Amount Receive | SFr				SFr 100,000
Contract exchange rate	1,183.43	1,183.43	1,183.43	1,183.43	1,183.43	1,183.43	1,183.43
Derivative, Term of Contract	2013~2019	2013~2019	2013~2019	2013~2019	2013~2019	2013~2019	2013~2019
Contract Interest rate Pay	3.47%	3.47%	3.47%	3.47%	3.47%	3.47%	3.47%
Contract Interest rate Receive	1.63%	1.63%	1.63%	1.63%	1.63%	1.63%	1.63%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Counterparty	Morgan Stanley	Morgan Stanley	Morgan Stanley	Morgan Stanley	Morgan Stanley	Morgan Stanley	Morgan Stanley
Contract Amount Pay	₩ 59,172
Contract Amount Receive | SFr				SFr 50,000
Contract exchange rate	1,183.43	1,183.43	1,183.43	1,183.43	1,183.43	1,183.43	1,183.43
Derivative, Term of Contract	2013~2019	2013~2019	2013~2019	2013~2019	2013~2019	2013~2019	2013~2019
Contract Interest rate Pay	3.40%	3.40%	3.40%	3.40%	3.40%	3.40%	3.40%
Contract Interest rate Receive	1.63%	1.63%	1.63%	1.63%	1.63%	1.63%	1.63%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Counterparty	Nomura	Nomura	Nomura	Nomura	Nomura	Nomura	Nomura
Contract Amount Pay	₩ 59,172
Contract Amount Receive | SFr				SFr 50,000
Contract exchange rate	1,183.43	1,183.43	1,183.43	1,183.43	1,183.43	1,183.43	1,183.43
Derivative, Term of Contract	2013~2019	2013~2019	2013~2019	2013~2019	2013~2019	2013~2019	2013~2019
Contract Interest rate Pay	3.47%	3.47%	3.47%	3.47%	3.47%	3.47%	3.47%
Contract Interest rate Receive	1.63%	1.63%	1.63%	1.63%	1.63%	1.63%	1.63%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Counterparty	Standard Chartered	Standard Chartered	Standard Chartered	Standard Chartered	Standard Chartered	Standard Chartered	Standard Chartered
Contract Amount Pay	₩ 104,490
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,044.90	1,044.90	1,044.90	1,044.90	1,044.90	1,044.90	1,044.90
Derivative, Term of Contract	2014~2019	2014~2019	2014~2019	2014~2019	2014~2019	2014~2019	2014~2019
Contract Interest rate Pay	2.77%	2.77%	2.77%	2.77%	2.77%	2.77%	2.77%
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]
Counterparty	Credit Agricole	Credit Agricole	Credit Agricole	Credit Agricole	Credit Agricole	Credit Agricole	Credit Agricole
Contract Amount Pay	₩ 104,490
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,044.90	1,044.90	1,044.90	1,044.90	1,044.90	1,044.90	1,044.90
Derivative, Term of Contract	2014~2019	2014~2019	2014~2019	2014~2019	2014~2019	2014~2019	2014~2019
Contract Interest rate Pay	2.77%	2.77%	2.77%	2.77%	2.77%	2.77%	2.77%
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]
Counterparty	Morgan Stanley	Morgan Stanley	Morgan Stanley	Morgan Stanley	Morgan Stanley	Morgan Stanley	Morgan Stanley
Contract Amount Pay	₩ 104,490
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,044.90	1,044.90	1,044.90	1,044.90	1,044.90	1,044.90	1,044.90
Derivative, Term of Contract	2014~2019	2014~2019	2014~2019	2014~2019	2014~2019	2014~2019	2014~2019
Contract Interest rate Pay	2.70%	2.70%	2.70%	2.70%	2.70%	2.70%	2.70%
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]
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]
Counterparty	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB 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]
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]
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]
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]
Counterparty	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB 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]
Counterparty	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB 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]
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]
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]
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]
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]
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]
Counterparty	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB 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]
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]
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]
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]
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]
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	1,128.9	1,128.9	1,128.9	1,128.9	1,128.9	1,128.9	1,128.9
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]
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	1,128.9	1,128.9	1,128.9	1,128.9	1,128.9	1,128.9	1,128.9
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]
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	1,128.9	1,128.9	1,128.9	1,128.9	1,128.9	1,128.9	1,128.9
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]
Counterparty	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank	KEB Hana Bank
Contract Amount Pay	₩ 56,445
Contract Amount Receive | $		$ 50,000
Contract exchange rate	1,128.9	1,128.9	1,128.9	1,128.9	1,128.9	1,128.9	1,128.9
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]
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	1,128.9	1,128.9	1,128.9	1,128.9	1,128.9	1,128.9	1,128.9
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, 2018 - 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		KEB 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		KEB 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	[1]	2017~2037
Contract Interest rate Pay	[1]	2.05%
Contract Interest rate Receive	[1]	3.08%
Contract amount | ₩	[1]	₩ 30,000
Not Designated as Hedging Instrument [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		KEB 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	[2]	2018~2038
Contract Interest rate Pay	[2]	2.56%
Contract Interest rate Receive	[2]	3.75%
Contract amount | ₩	[2]	₩ 30,000
Not Designated as Hedging Instrument [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		KEB 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		KEB 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		KEB 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		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		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		Credit Agricole
Derivative, Term of Contract		2018~2033
Contract Interest rate Pay		3.98%~4.10%
Contract Interest rate Receive		6M USD Libor
Contract amount			92,686
Designated as Hedging Instrument [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		SMBC
Derivative, Term of Contract		2018~2033
Contract Interest rate Pay		4.05%~4.18%
Contract Interest rate Receive		6M USD Libor
Contract amount			121,205
Designated as Hedging Instrument [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Mizuho Bank
Derivative, Term of Contract		2016~2019
Contract Interest rate Pay		1.56%
Contract Interest rate Receive		1.65%
Contract amount			36,890
Designated as Hedging Instrument [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		SMBC
Derivative, Term of Contract		2016~2019
Contract Interest rate Pay		1.56%
Contract Interest rate Receive		1.65%
Contract amount			36,890
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		4.99%
Contract amount			$ 2,564
[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.
[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.

Other-Financial Assets (Details

Other-Financial Assets (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2018	Dec. 31, 2017
Other Financial Assets [Line Items]
Current Other financial assets		₩ 1,991,939	₩ 1,945,417
Non-Current Other financial assets		1,044,762	1,316,250
Loans and receivables
Other Financial Assets [Line Items]
Current Other financial assets		122,653	243,333
Non-Current Other financial assets		596,021	662,308
Loans and receivables | Gross amount
Other Financial Assets [Line Items]
Current Other financial assets		123,657	244,309
Non-Current Other financial assets		639,673	711,069
Loans and receivables | Allowance for doubtful accounts
Other Financial Assets [Line Items]
Current Other financial assets		(12)	0
Non-Current Other financial assets		(4,940)	(8,948)
Loans and receivables | Present value discount
Other Financial Assets [Line Items]
Current Other financial assets		(992)	(976)
Non-Current Other financial assets		(38,712)	(39,813)
Short-term financial instruments
Other Financial Assets [Line Items]
Current Other financial assets	[1]	1,869,286	1,702,084
Long-term financial instruments
Other Financial Assets [Line Items]
Non-Current Other financial assets	[1]	448,741	542,430
Financial assets at fair value through profit or loss
Other Financial Assets [Line Items]
Current Other financial assets	[1]	0	0
Non-Current Other financial assets	[1]	₩ 0	₩ 111,512
[1]	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, 2018	Dec. 31, 2017
Loans and Leases Receivable Disclosure [Line Items]
Loans and receivables	₩ 718,674	₩ 905,641
Gross amount
Loans and Leases Receivable Disclosure [Line Items]
Loans and receivables	763,330	955,378
Allowance for doubtful accounts
Loans and Leases Receivable Disclosure [Line Items]
Loans and receivables	(4,952)	(8,948)
Present value discount
Loans and Leases Receivable Disclosure [Line Items]
Loans and receivables	(39,704)	(40,789)
Short-term loans and receivables
Loans and Leases Receivable Disclosure [Line Items]
Loans for tuition	32,341	32,787
Loans for housing	15,572	14,126
Loans for related parties	0	0
Fisheries loan	320	352
Other loans	74,420	196,068
Loans and receivables	122,653	243,333
Short-term loans and receivables | Gross amount
Loans and Leases Receivable Disclosure [Line Items]
Loans for tuition	33,333	33,763
Loans for housing	15,572	14,126
Loans for related parties	0	0
Fisheries loan	320	352
Other loans	74,432	196,068
Loans and receivables	123,657	244,309
Short-term loans and receivables | Allowance for doubtful accounts
Loans and Leases Receivable Disclosure [Line Items]
Loans for tuition	0	0
Loans for housing	0	0
Loans for related parties	0	0
Fisheries loan	0	0
Other loans	(12)	0
Loans and receivables	(12)	0
Short-term loans and receivables | Present value discount
Loans and Leases Receivable Disclosure [Line Items]
Loans for tuition	(992)	(976)
Loans for housing	0	0
Loans for related parties	0	0
Fisheries loan	0	0
Other loans	0	0
Loans and receivables	(992)	(976)
Long-term loans and receivables
Loans and Leases Receivable Disclosure [Line Items]
Loans for tuition	376,234	369,087
Loans for housing	167,723	140,452
Loans for related parties	41,868	85,633
Fisheries loan	587	863
Other loans	9,609	66,273
Loans and receivables	596,021	662,308
Long-term loans and receivables | Gross amount
Loans and Leases Receivable Disclosure [Line Items]
Loans for tuition	414,893	408,803
Loans for housing	167,723	140,452
Loans for related parties	46,798	94,581
Fisheries loan	640	960
Other loans	9,619	66,273
Loans and receivables	639,673	711,069
Long-term loans and receivables | Allowance for doubtful accounts
Loans and Leases Receivable Disclosure [Line Items]
Loans for tuition	0	0
Loans for housing	0	0
Loans for related parties	(4,930)	(8,948)
Fisheries loan	0	0
Other loans	(10)	0
Loans and receivables	(4,940)	(8,948)
Long-term loans and receivables | Present value discount
Loans and Leases Receivable Disclosure [Line Items]
Loans for tuition	(38,659)	(39,716)
Loans for housing	0	0
Loans for related parties	0	0
Fisheries loan	(53)	(97)
Other loans	0	0
Loans and receivables	₩ (38,712)	₩ (39,813)

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, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for doubtful accounts [Abstract]
Beginning balance	₩ 8,948	₩ 4,532	₩ 0
Bad debt expense	22	2,465	4,352
Other	(4,018)	1,951	180
Ending balance	₩ 4,952	₩ 8,948	₩ 4,532

Long-term and short-term financ

Long-term and short-term financial instruments (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Short-term financial instruments
Long / short-term financial instruments [Line Items]
Time deposits	₩ 1,602,285	₩ 1,479,034
ABCP	0	145,000
CP	0	58,050
CD	10,000	10,000
RP	0	10,000
Others	257,001	0
Long / short-term financial instruments	1,869,286	1,702,084
Long-term financial instruments
Long / short-term financial instruments [Line Items]
Time deposits	63,358	2
ABCP	0	65,600
CP	0	0
CD	0	0
RP	0	1,634
Others	385,383	475,194
Long / short-term financial instruments	₩ 448,741	₩ 542,430

Inventories (Details)

Inventories (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Inventory [Line Items]
Raw materials	₩ 3,884,130	₩ 3,526,006
Merchandise		107
Work-in-progress	188,879	137,681
Finished goods	50,526	71,406
Supplies	1,854,844	1,577,721
Inventories in transit	1,196,113	679,358
Other inventories	13,761	9,807
Total Inventories	7,188,253	6,002,086
Acquisition cost
Inventory [Line Items]
Raw materials	3,886,739	3,528,835
Merchandise		107
Work-in-progress	189,907	138,709
Finished goods	50,526	72,923
Supplies	1,858,751	1,581,661
Inventories in transit	1,196,113	679,358
Other inventories	13,761	9,807
Total Inventories	7,195,797	6,011,400
Valuation allowance
Inventory [Line Items]
Raw materials	(2,609)	(2,829)
Merchandise		0
Work-in-progress	(1,028)	(1,028)
Finished goods	0	(1,517)
Supplies	(3,907)	(3,940)
Inventories in transit	0	0
Other inventories	0	0
Total Inventories	₩ (7,544)	₩ (9,314)

Finance Lease Receivables (Deta

Finance Lease Receivables (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Finance lease receivables of the Group as lessor [Line Items]
Present value of minimum lease payment	₩ 982,213	₩ 862,621
Gross amount
Finance lease receivables of the Group as lessor [Line Items]
Minimum lease payment	1,925,452	1,829,172
Present value of minimum lease payment	983,346	862,621
Gross amount | Not Later Than 1 Year
Finance lease receivables of the Group as lessor [Line Items]
Minimum lease payment	124,918	49,542
Present value of minimum lease payment	84,688	13,067
Gross amount | 1~5 Years
Finance lease receivables of the Group as lessor [Line Items]
Minimum lease payment	467,518	381,181
Present value of minimum lease payment	223,622	203,990
Gross amount | More than 5 years
Finance lease receivables of the Group as lessor [Line Items]
Minimum lease payment	1,333,016	1,398,449
Present value of minimum lease payment	675,036	645,564
Allowance for doubtful accounts
Finance lease receivables of the Group as lessor [Line Items]
Present value of minimum lease payment	₩ (1,133)	₩ 0

Changes in the allowance for do

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

Non-Financial Assets (Details)

Non-Financial Assets (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2018	Dec. 31, 2017
Other Current Assets
Non-Financial Assets [Line Items]
Advance payment		₩ 156,073	₩ 109,743
Prepaid Expense		290,944	251,715
Miscellaneous Non-Financial Assets
Tax refund receivables		82,348	89,762
Greenhouse gas emissions rights		93,749	135,211
Other quick assets	[1]	255,774	167,561
Miscellaneous Non-Financial Assets		431,871	392,534
Non-Financial Assets		878,888	753,992
Other Noncurrent Assets
Non-Financial Assets [Line Items]
Advance payment		160,628	43,872
Prepaid Expense		90,449	90,118
Miscellaneous Non-Financial Assets
Tax refund receivables		1,276	1,940
Greenhouse gas emissions rights		0	0
Other quick assets	[1]	74,799	110,888
Miscellaneous Non-Financial Assets		76,075	112,828
Non-Financial Assets		₩ 327,152	₩ 246,818
[1]	The Company has recognized KRW92,128 million of its rights in connection with the securities of Orano Expansion as non-current non-financial assets as of December 31, 2017 and 2018. The Company recognized an impairment loss of KRW87,023 million as it was determined that there is objective evidence of impairment related to its equity interest in and loans to Orano Expansion for the year ended December 31, 2018.

Consolidated subsidiaries (Deta

Consolidated subsidiaries (Details)		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
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]	49.00%	49.00%
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 Canada Energy
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		0.00%	100.00%
Reason		Liquidated
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		79.64%	79.64%
Korea Electric Power Nigeria
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		NIGERIA	NIGERIA
Proportion of ownership interest in subsidiary		100.00%	100.00%
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	[2]	Operation of utility plant	Operation of utility plant
Country of incorporation of subsidiary	[2]	INDONESIA	INDONESIA
Proportion of ownership interest in subsidiary	[2]	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		96.36%	96.36%
PT KEPCO Resource 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		0.00%	100.00%
Reason		Liquidated
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
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	[3]	Power generation	Power generation
Country of incorporation of subsidiary	[3]	PAKISTAN	PAKISTAN
Proportion of ownership interest in subsidiary	[3]	76.00%	76.00%
KOSEP Material
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities	[4]	Recycling fly ashes	Recycling fly ashes
Country of incorporation of subsidiary	[4]	KOREA	KOREA
Proportion of ownership interest in subsidiary	[4]	86.22%	86.22%
Commerce and Industry Energy
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]	KOREA	KOREA
Proportion of ownership interest in subsidiary	[5]	59.03%	59.03%
KEPCO Singapore Holdings 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%
KOWEPO India Private Limited
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities	[6]	Holding company	Holding company
Country of incorporation of subsidiary	[6]	INDIA	INDIA
Proportion of ownership interest in subsidiary	[6]	0.00%	100.00%
Reason	[6]	Liquidating
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		51.00%	51.00%
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%
HI Carbon Professional Private Special Asset Investment Trust 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		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%	99.75%
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		50.51%	50.51%
Cogentrix Solar Services
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		0.00%	50.51%
Reason		Liquidated
Solar Investments I
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		0.00%	50.51%
Reason		Liquidated
Cogentrix of Alamosa
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		50.51%	50.51%
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		70.00%	70.00%
KEPCO-LG CNS Mangilao Solar
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		70.00%	70.00%
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		68.84%	70.22%
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%	64.71%
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		80.86%	81.47%
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		75.36%	75.92%
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		79.85%	80.45%
PT. Korea Energy Indonesia
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Utility plant maintenance and others
Country of incorporation of subsidiary		INDONESIA
Proportion of ownership interest in subsidiary		95.00%
Reason		Newly Established
KOLAT SpA
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Utility plant maintenance and others
Country of incorporation of subsidiary		CHILE
Proportion of ownership interest in subsidiary		100.00%
Reason		Newly Established
KEPCO California, 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 Mojave 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
Incheon Fuel Cell 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		60.00%
Reason		Newly Established
KOEN Service Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Facility maintenance and service
Country of incorporation of subsidiary		KOREA
Proportion of ownership interest in subsidiary		100.00%
Reason		Newly Established
KOMIPO Service Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Facility maintenance and service
Country of incorporation of subsidiary		KOREA
Proportion of ownership interest in subsidiary		100.00%
Reason		Newly Established
KOWEPO Service Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Facility maintenance and service
Country of incorporation of subsidiary		KOREA
Proportion of ownership interest in subsidiary		100.00%
Reason		Newly Established
KOSPO Service Co., Ltd
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Facility maintenance and service
Country of incorporation of subsidiary		KOREA
Proportion of ownership interest in subsidiary		100.00%
Reason		Newly Established
EWP Service Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Facility maintenance and service
Country of incorporation of subsidiary		KOREA
Proportion of ownership interest in subsidiary		100.00%
Reason		Newly Established
PT. KOMIPO Energy Indonesia
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Utility plant maintenance and others
Country of incorporation of subsidiary		INDONESIA
Proportion of ownership interest in subsidiary		95.00%
Reason		Newly Established
[1]	Considering treasury stocks, the effective percentage of ownership is 66.08%.
[2]	These subsidiaries are included in the consolidated financial statements as the Company obtained the majority of the voting power through the shareholders' agreement.
[3]	As of reporting date, the annual reporting period of all subsidiaries is December 31, except for Mira Power Limited which is November 30.
[4]	The effective percentage of ownership has increased to 86.22% since Long Lasting Value exercised the put option to sell its investment to KOSEP during the year ended December 31, 2017.
[5]	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.
[6]	KOWEPO India Private Limited was in the process of liquidating its business as of December 31, 2018 and has been reclassified to assets held-for-sale, accordingly.

Summary of financial informatio

Summary of financial information of consolidated subsidiaries (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Korea Hydro & Nuclear Power
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		₩ 55,792,704	₩ 55,011,096
Total liabilities		30,484,104	29,252,816
Sales		8,858,717	9,415,751
Profit (loss) for the period		(137,613)	854,346
Korea South-East Power
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		9,997,758	9,879,577
Total liabilities		4,948,553	4,844,184
Sales		5,521,038	5,387,846
Profit (loss) for the period		25,736	130,371
Korea Midland Power
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		10,839,218	9,893,822
Total liabilities		7,088,013	6,148,173
Sales		4,368,467	4,167,009
Profit (loss) for the period		(38,142)	104,591
Korea Western Power
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		9,902,752	9,660,426
Total liabilities		5,965,410	5,739,534
Sales		4,841,261	4,199,079
Profit (loss) for the period		(28,157)	110,939
Korea Southern Power
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		9,810,985	9,648,741
Total liabilities		5,463,721	5,401,216
Sales		5,539,793	4,397,552
Profit (loss) for the period		55,439	98,817
Korea East-West Power
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		8,744,380	8,855,518
Total liabilities		4,092,460	4,204,187
Sales		4,933,525	4,644,330
Profit (loss) for the period		3,345	217,599
KEPCO Engineering & Construction Company
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		771,480	762,166
Total liabilities		310,100	305,134
Sales		433,701	490,193
Profit (loss) for the period		12,937	21,222
KEPCO Plant Service & Engineering
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		1,275,365	1,195,086
Total liabilities		296,428	294,689
Sales		1,239,604	1,232,113
Profit (loss) for the period		160,791	135,482
KEPCO Nuclear Fuel
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		817,416	792,187
Total liabilities		434,439	421,088
Sales		230,667	279,664
Profit (loss) for the period		15,835	4,557
KEPCO KDN
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		566,807	524,520
Total liabilities		159,423	155,715
Sales		622,154	619,470
Profit (loss) for the period		60,016	48,968
Garolim Tidal Power Plant
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		608	619
Total liabilities		345	345
Sales		0	0
Profit (loss) for the period		(11)	(12)
KEPCO International HongKong
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		140,101	153,529
Total liabilities		1	1
Sales		0	0
Profit (loss) for the period		3,307	4,380
KEPCO International Philippines
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		107,948	102,323
Total liabilities		1,475	886
Sales		0	0
Profit (loss) for the period		52,539	47,201
KEPCO Gansu International
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		12,047	11,567
Total liabilities		515	493
Sales		0	0
Profit (loss) for the period		(24)	(29)
KEPCO Philippines Holdings
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		188,551	127,922
Total liabilities		9,775	2,621
Sales		0	0
Profit (loss) for the period		53,219	43,218
KEPCO Philippines Corporation
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		6,394	6,293
Total liabilities		213	114
Sales		0	0
Profit (loss) for the period		54	2,098
KEPCO Ilijan Corporation
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		431,444	474,624
Total liabilities		53,413	57,801
Sales		99,844	109,183
Profit (loss) for the period		49,631	66,320
KEPCO Lebanon SARL
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		1,509	1,069
Total liabilities		9,686	9,281
Sales		0	0
Profit (loss) for the period		413	(219)
KEPCO Neimenggu International
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		194,336	165,937
Total liabilities		0	0
Sales		0	0
Profit (loss) for the period		20,829	500
KEPCO Shanxi International
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		519,991	497,990
Total liabilities		201,732	193,309
Sales		0	0
Profit (loss) for the period		290	3,796
KOMIPO Global Pte
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		250,456	225,411
Total liabilities		961	1,497
Sales		0	0
Profit (loss) for the period		11,478	21,858
KEPCO Canada Energy
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets			132
Total liabilities			22
Profit (loss) for the period			(32)
KEPCO Netherlands B.V.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		130,460	114,911
Total liabilities		77	49
Sales		0	0
Profit (loss) for the period		26,550	17,309
KOREA Imouraren Uranium Investment Corp.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		63,517	151,278
Total liabilities		171	131
Sales		0	0
Profit (loss) for the period		(89,852)	1,490
KEPCO Australia
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		439,719	466,654
Total liabilities		14	569
Sales		0	0
Profit (loss) for the period		49	(568)
KOSEP Australia
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		37,057	27,076
Total liabilities		2,832	333
Sales		20,294	12,096
Profit (loss) for the period		7,315	1,601
KOMIPO Australia
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		39,066	31,441
Total liabilities		4,659	4,691
Sales		20,294	12,096
Profit (loss) for the period		7,193	1,133
KOWEPO Australia
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		39,341	31,586
Total liabilities		4,702	4,691
Sales		20,294	12,096
Profit (loss) for the period		7,316	1,232
KOSPO Australia
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		36,525	29,472
Total liabilities		3,585	4,221
Sales		20,294	12,096
Profit (loss) for the period		9,520	(2,759)
KEPCO Middle East Holding Company
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		101,201	95,812
Total liabilities		92,862	90,842
Sales		0	0
Profit (loss) for the period		3,043	2,913
Qatrana Electric Power Company
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		484,383	460,206
Total liabilities		326,486	327,401
Sales		18,766	18,892
Profit (loss) for the period		21,170	23,310
KHNP Canada Energy
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		49,776	51,994
Total liabilities		35	31
Sales		0	0
Profit (loss) for the period		(26)	(92)
KEPCO Bylong Australia
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		254,398	242,364
Total liabilities		315,921	277,549
Sales		0	0
Profit (loss) for the period		(29,573)	20,271
Korea Waterbury Uranium Limited Partnership
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		20,890	20,886
Total liabilities		142	136
Sales		0	0
Profit (loss) for the period		(74)	(59)
Korea Electric Power Nigeria
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		112	238
Total liabilities		39	76
Sales		727	2,164
Profit (loss) for the period		(93)	29
KEPCO Holdings de Mexico
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		248	235
Total liabilities		57	30
Sales		0	0
Profit (loss) for the period		(11)	(20)
KST Electric Power Company
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		535,807	546,242
Total liabilities		457,867	478,230
Sales		109,735	120,126
Profit (loss) for the period		10,274	16,154
KEPCO Energy Service Company
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		1,940	1,793
Total liabilities		1,454	451
Sales		5,117	6,773
Profit (loss) for the period		(232)	976
KEPCO Netherlands S3 B.V.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		46,642	46,642
Total liabilities		53	53
Sales		0	0
Profit (loss) for the period		2,382	2,382
PT. KOMIPO Pembangkitan Jawa Bali
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		11,405	11,261
Total liabilities		5,472	4,769
Sales		20,320	20,956
Profit (loss) for the period		3,925	4,666
PT. Cirebon Power Service
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		1,588	2,808
Total liabilities		273	155
Sales		7,228	7,439
Profit (loss) for the period		177	592
KOWEPO International Corporation
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		0	0
Total liabilities		8	8
Sales		0	0
Profit (loss) for the period		0	(2)
KOSPO Jordan
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		16,315	24,077
Total liabilities		3,432	13,594
Sales		34,371	7,331
Profit (loss) for the period		1,907	953
EWP Philippines Corporation
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		1,684	1,708
Total liabilities		829	836
Sales		0	0
Profit (loss) for the period		(11)	(17)
EWP America
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	[1]	72,525	79,854
Total liabilities	[1]	4,903	67,308
Sales	[1]	29,557	23,543
Profit (loss) for the period	[1]	(4,483)	(9,737)
KNF Canada Energy Limited
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		1,801	1,884
Total liabilities		20	31
Sales		0	0
Profit (loss) for the period		(45)	(43)
PT KEPCO Resource Indonesia
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets			491
Total liabilities			0
Sales			0
Profit (loss) for the period			(311)
EWP Barbados 1 SRL
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		268,033	235,096
Total liabilities		1,581	450
Sales		688	0
Profit (loss) for the period		11,221	(2,585)
Gyeonggi Green Energy
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		293,812	282,408
Total liabilities		185,043	199,160
Sales		96,442	95,192
Profit (loss) for the period		25,121	3,203
PT. Tanggamus Electric Power
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		216,321	179,317
Total liabilities		187,502	160,144
Sales		26,832	34,281
Profit (loss) for the period		9,338	4,640
Gyeongju Wind Power
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		122,303	112,279
Total liabilities		83,348	82,124
Sales		21,906	7,219
Profit (loss) for the period		8,803	2,400
KOMIPO America
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		10,092	10,505
Total liabilities		572	521
Sales		0	0
Profit (loss) for the period		(885)	2,071
KOSEP USA INC.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		1	184
Total liabilities		4,857	9,065
Sales		0	0
Profit (loss) for the period		4,341	26,997
PT. EWP Indonesia
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		7,444	2,035
Total liabilities		14	23
Sales		0	0
Profit (loss) for the period		3,138	1,916
KEPCO Netherlands J3 B.V.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		115,978	122,612
Total liabilities		77	76
Sales		0	0
Profit (loss) for the period		(104)	12,115
Korea Offshore Wind Power
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		216,114	190,195
Total liabilities		36,377	1,985
Sales		0	0
Profit (loss) for the period		(8,473)	(6,997)
Global One Pioneer B.V.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		162	151
Total liabilities		87	38
Sales		0	0
Profit (loss) for the period		(113)	(80)
Global Energy Pioneer B.V.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		325	309
Total liabilities		74	41
Sales		0	0
Profit (loss) for the period		(102)	(87)
Mira Power Limited
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		277,525	208,150
Total liabilities		213,104	163,198
Sales		0	0
Profit (loss) for the period		(980)	737
KOSEP Material
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		2,862	2,751
Total liabilities		1,249	1,448
Sales		3,240	3,128
Profit (loss) for the period		377	320
Commerce and Industry Energy
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		92,872	99,129
Total liabilities		88,009	87,926
Sales		27,937	30,577
Profit (loss) for the period		(6,091)	(749)
KEPCO Singapore Holdings Pte.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		582	3,265
Total liabilities		9	4
Sales		0	0
Profit (loss) for the period		(31)	(24)
KOWEPO India Private Limited
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets			781
Total liabilities			0
Sales			0
Profit (loss) for the period			(46)
KEPCO KPS Philippines Corp.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		7,501	6,636
Total liabilities		358	235
Sales		4,815	6,840
Profit (loss) for the period		766	555
KOSPO Chile SpA
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		139,814	133,570
Total liabilities		57,502	50,109
Sales		0	0
Profit (loss) for the period		1,016	1,066
PT. KOWEPO Sumsel Operation and Maintenance Services
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		1,313	1,350
Total liabilities		394	279
Sales		4,343	7,651
Profit (loss) for the period		(654)	659
HeeMang Sunlight Power
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		10,915	6,876
Total liabilities		7,626	3,395
Sales		146	105
Profit (loss) for the period		(192)	(229)
Fujeij Wind Power Company
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		217,796	165,636
Total liabilities		212,435	156,099
Sales		0	0
Profit (loss) for the period		(1,033)	8,836
KOSPO Youngnam Power
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		413,472	412,785
Total liabilities		325,589	333,302
Sales		369,669	68,973
Profit (loss) for the period		8,155	939
HI Carbon Professional Private Special Asset Investment Trust 1
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		115,505	136,098
Total liabilities		105,079	121,622
Sales		15,022	7,083
Profit (loss) for the period		872	4,100
KEPCO Energy Solution
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		304,103	313,401
Total liabilities		849	12,376
Sales		5,584	5,544
Profit (loss) for the period		2,532	1,325
Solar School Plant
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		204,282	201,482
Total liabilities		1,366	599
Sales		1,149	67
Profit (loss) for the period		2,033	874
KOSPO Power Services Limitada
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		3,045	3,901
Total liabilities		596	887
Sales		9,610	11,067
Profit (loss) for the period		1,132	666
Energy New Industry Specialized Investment Private Investment Trust
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	[2]	66,498	506,207
Total liabilities	[2]	1,014	2,118
Sales	[2]	0	0
Profit (loss) for the period	[2]	(1,140)	52
KOEN Bylong
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		5,544	5,875
Total liabilities		26	0
Sales		0	0
Profit (loss) for the period		(10)	0
KOMIPO Bylong
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		5,544	5,875
Total liabilities		26	0
Sales		0	0
Profit (loss) for the period		(25)	0
KOWEPO Bylong
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		5,544	5,875
Total liabilities		26	0
Sales		0	0
Profit (loss) for the period		0	0
KOSPO Bylong
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		5,544	5,875
Total liabilities		26	0
Sales		0	0
Profit (loss) for the period		(25)	0
EWP Bylong
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		5,544	5,875
Total liabilities		26	0
Sales		0	0
Profit (loss) for the period		(15)	0
KOWEPO Lao International
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		3,800	3,259
Total liabilities		1,015	1,452
Sales		2,899	3,624
Profit (loss) for the period		895	1,881
KEPCO US
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		16,640	16,913
Total liabilities		0	0
Sales		0	0
Profit (loss) for the period		6	0
KEPCO Alamosa
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		32,346	33,144
Total liabilities		79	492
Sales		750	0
Profit (loss) for the period		(688)	(218)
Cogentrix Solar Services
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		64,223	84,458	[3]
Total liabilities		48,819	53,116	[3]
Sales		9,015	8,958	[3]
Profit (loss) for the period		200	(112)	[3]
KEPCO-LG CNS Mangilao Holdings
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		25,642	24,131
Total liabilities		27,197	24,395
Sales		0	0
Profit (loss) for the period		(1,144)	(278)
Mangilao Investment
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		25,641	24,131
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		25,406	24,002
Total liabilities		146	134
Sales		0	0
Profit (loss) for the period		(104)	(278)
Jeju Hanlim Offshore Wind Co
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		16,557	36
Total liabilities		328	0
Sales		0	0
Profit (loss) for the period		(925)	0
PT. Siborpa Eco Power
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		12,363	11,562
Total liabilities		141	214
Sales		0	0
Profit (loss) for the period		(1,771)	₩ (518)
PT. Korea Energy Indonesia
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		1,183
Total liabilities		60
Sales		1,459
Profit (loss) for the period		223
KOLAT SpA
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		38,362
Total liabilities		474
Sales		585
Profit (loss) for the period		(186)
KEPCO California, LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		42,171
Total liabilities		21
Sales		0
Profit (loss) for the period		(332)
KEPCO Mojave Holdings, LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		103,189
Total liabilities		65,730
Sales		0
Profit (loss) for the period		(3,959)
Incheon Fuel Cell Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		23,626
Total liabilities		415
Sales		0
Profit (loss) for the period		(201)
KOEN Service Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		583
Total liabilities		31
Sales		0
Profit (loss) for the period		(48)
KOMIPO Service Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		576
Total liabilities		17
Sales		0
Profit (loss) for the period		(41)
KOWEPO Service Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		750
Total liabilities		227
Sales		0
Profit (loss) for the period		(77)
KOSPO Service Co., Ltd
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		576
Total liabilities		6
Sales		0
Profit (loss) for the period		(30)
EWP Service Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		667
Total liabilities		97
Sales		0
Profit (loss) for the period		(30)
PT. KOMIPO Energy Indonesia
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		2,236
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.
[3]	Financial information of Cogentrix Solar Services, LLC includes that of two other subsidiaries, Solar Investments I, LLC and KEPCO Solar of Alamosa, LLC (formerly, Cogentrix of Alamosa, LLC).

Details of non-controlling inte

Details of non-controlling interest prior to intra-group eliminations (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Subsidiaries [Member]
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items]
Current assets of subsidiaries	₩ 2,030,665	₩ 2,311,226	₩ 2,190,745
Non-current assets of subsidiaries	4,165,052	3,978,658	3,831,694
Current liabilities of subsidiaries	(1,094,870)	(916,288)	(867,716)
Non-current liabilities of subsidiaries	(2,058,206)	(2,150,581)	(2,074,333)
Net assets of subsidiaries	3,042,641	3,223,015	3,080,390
Book value of non-controlling interest	1,502,377	1,412,707	1,456,618
Sales of subsidiaries	2,739,186	2,550,576	2,511,444
Profit for the period of subsidiaries	315,816	289,443	258,175
Profit for the period attributable to non-controlling interest of subsidiaries	135,970	126,529	100,467
Cash flows from operating activities of subsidiaries	414,012	375,934	326,620
Cash flows from investing activities of subsidiaries	(143,447)	(616,659)	(295,540)
Cash flows from financing activities before dividends to non-controlling interest of subsidiaries	(476,730)	223,880	779,455
Dividends to non-controlling interest of subsidiaries	(110,331)	(86,108)	(116,437)
Effect of exchange rate fluctuation of subsidiaries	4,051	(33,006)	8,018
Net increase (decrease) of cash and cash equivalents of subsidiaries	₩ (312,445)	₩ (135,959)	₩ 702,116
KEPCO Ilijan Corporation
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items]
Percentage of noncontrolling interest	49.00%	49.00%	49.00%
Current assets of subsidiaries	₩ 163,622	₩ 160,588	₩ 154,758
Non-current assets of subsidiaries	267,822	314,036	403,272
Current liabilities of subsidiaries	(16,819)	(21,546)	(19,256)
Non-current liabilities of subsidiaries	(36,594)	(36,255)	(39,193)
Net assets of subsidiaries	378,031	416,823	499,581
Book value of non-controlling interest	185,235	204,243	244,794
Sales of subsidiaries	99,844	109,183	116,667
Profit for the period of subsidiaries	49,631	66,320	51,552
Profit for the period attributable to non-controlling interest of subsidiaries	24,319	32,497	25,260
Cash flows from operating activities of subsidiaries	92,822	123,534	102,546
Cash flows from investing activities of subsidiaries	(4,452)	(5,276)	(117)
Cash flows from financing activities before dividends to non-controlling interest of subsidiaries	(53,733)	(44,442)	(56,863)
Dividends to non-controlling interest of subsidiaries	(51,626)	(48,855)	(55,705)
Effect of exchange rate fluctuation of subsidiaries	2,840	(7,432)	1,529
Net increase (decrease) of cash and cash equivalents of subsidiaries	₩ (14,149)	₩ 17,529	₩ (8,610)
KEPCO Plant Service & Engineering
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items]
Percentage of noncontrolling interest	49.00%	49.00%	49.00%
Current assets of subsidiaries	₩ 628,725	₩ 623,934	₩ 553,924
Non-current assets of subsidiaries	646,640	571,152	532,497
Current liabilities of subsidiaries	(270,097)	(278,562)	(264,506)
Non-current liabilities of subsidiaries	(26,331)	(16,127)	(36,984)
Net assets of subsidiaries	978,937	900,397	784,931
Book value of non-controlling interest	479,679	441,194	384,616
Sales of subsidiaries	1,239,604	1,232,113	1,214,304
Profit for the period of subsidiaries	160,791	135,482	86,657
Profit for the period attributable to non-controlling interest of subsidiaries	78,788	66,386	42,462
Cash flows from operating activities of subsidiaries	129,700	129,801	121,240
Cash flows from investing activities of subsidiaries	(123,593)	(193,408)	79,807
Cash flows from financing activities before dividends to non-controlling interest of subsidiaries	(33,737)	(15,606)	(39,911)
Dividends to non-controlling interest of subsidiaries	(32,414)	(14,994)	(36,139)
Effect of exchange rate fluctuation of subsidiaries	(124)	(1,267)	127
Net increase (decrease) of cash and cash equivalents of subsidiaries	₩ (60,168)	₩ (95,474)	₩ 125,124
KEPCO Engineering & Construction Company
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items]
Percentage of noncontrolling interest	33.92%	33.92%	33.92%
Current assets of subsidiaries	₩ 281,390	₩ 257,529	₩ 270,553
Non-current assets of subsidiaries	490,090	504,637	516,043
Current liabilities of subsidiaries	(248,402)	(221,860)	(286,444)
Non-current liabilities of subsidiaries	(61,698)	(83,274)	(78,232)
Net assets of subsidiaries	461,380	457,032	421,920
Book value of non-controlling interest	156,500	155,025	143,115
Sales of subsidiaries	433,701	490,193	506,012
Profit for the period of subsidiaries	12,937	21,222	17,796
Profit for the period attributable to non-controlling interest of subsidiaries	4,388	7,199	6,036
Cash flows from operating activities of subsidiaries	81,042	62,578	18,748
Cash flows from investing activities of subsidiaries	(50,569)	(8,622)	(7,556)
Cash flows from financing activities before dividends to non-controlling interest of subsidiaries	(14,591)	(55,504)	(1,634)
Dividends to non-controlling interest of subsidiaries	(2,839)	(1,419)	(2,539)
Effect of exchange rate fluctuation of subsidiaries	31	(101)	(854)
Net increase (decrease) of cash and cash equivalents of subsidiaries	13,074	(3,068)	6,165
Others
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items]
Current assets of subsidiaries	956,928	1,269,175	1,211,510
Non-current assets of subsidiaries	2,760,500	2,588,833	2,379,882
Current liabilities of subsidiaries	(559,552)	(394,320)	(297,510)
Non-current liabilities of subsidiaries	(1,933,583)	(2,014,925)	(1,919,924)
Net assets of subsidiaries	1,224,293	1,448,763	1,373,958
Book value of non-controlling interest	680,963	612,245	684,093
Sales of subsidiaries	966,037	719,087	674,461
Profit for the period of subsidiaries	92,457	66,419	102,170
Profit for the period attributable to non-controlling interest of subsidiaries	28,475	20,447	26,709
Cash flows from operating activities of subsidiaries	110,448	60,021	84,086
Cash flows from investing activities of subsidiaries	35,167	(409,353)	(367,674)
Cash flows from financing activities before dividends to non-controlling interest of subsidiaries	(374,669)	339,432	877,863
Dividends to non-controlling interest of subsidiaries	(23,452)	(20,840)	(22,054)
Effect of exchange rate fluctuation of subsidiaries	1,304	(24,206)	7,216
Net increase (decrease) of cash and cash equivalents of subsidiaries	₩ (251,202)	₩ (54,946)	₩ 579,437

Gain (loss) from Disposals of s

Gain (loss) from Disposals of subsidiaries (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]
gain (loss) of Disposaled subsidiaries	[1]	₩ 72	₩ 0	₩ 0
Fair value of Disposaled subsidiaries
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]
gain (loss) of Disposaled subsidiaries		160	0	35,046
Consideration received in cash
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]
gain (loss) of Disposaled subsidiaries		160	0	898
Net assets transferred due to dissolution
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]
gain (loss) of Disposaled subsidiaries		0	0	34,148
Carrying value of Disposaled subsidiaries
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]
gain (loss) of Disposaled subsidiaries		158	0	35,046
Cash and Cash Equivalents
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]
gain (loss) of Disposaled subsidiaries		175	0	898
Total current financial assets
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]
gain (loss) of Disposaled subsidiaries		0	0	81
Trade receivables
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]
gain (loss) of Disposaled subsidiaries		11	0	0
Financial assets available-for-sale
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]
gain (loss) of Disposaled subsidiaries		0	0	34,089
Current financial liabilities
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]
gain (loss) of Disposaled subsidiaries		0	0	(22)
Trade and other payables
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]
gain (loss) of Disposaled subsidiaries		(28)	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		70	0	0
Other comprehensive income
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]
gain (loss) of Disposaled subsidiaries		₩ 0	₩ 0	₩ 0
[1]	Gain from 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, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of Cashflows From Disposaled subsidiaries [Line Items]
Net cash flow of Disposaled subsidiaries	₩ (15)	₩ 0	₩ 0
Consideration received in cash
Disclosure of Cashflows From Disposaled subsidiaries [Line Items]
Net cash flow of Disposaled subsidiaries	160	0	898
Less: cash held by disposed subsidiaries
Disclosure of Cashflows From Disposaled subsidiaries [Line Items]
Net cash flow of Disposaled subsidiaries	₩ (175)	₩ 0	₩ (898)

Cash dividends received from su

Cash dividends received from subsidiaries (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Subsidiaries
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	₩ 704,782	₩ 1,088,210	₩ 1,150,208
Korea Hydro & Nuclear Power
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	281,234	543,072	635,200
Korea South-East Power
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	33,928	106,546	124,169
Korea Midland Power
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	26,581	54,305	23,073
Korea Western Power
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	28,996	66,992	36,238
Korea Southern Power
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	25,780	60,630	17,849
Korea East-West Power
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	61,408	94,430	67,906
KEPCO Engineering & Construction Company
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	5,531	2,765	5,069
KEPCO Plant Service & Engineering
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	33,739	15,607	39,911
KEPCO Nuclear Fuel
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	1,077	3,231	3,411
KEPCO KDN
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	13,888	4,352	3,392
KEPCO International HongKong
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	23,314	4,304	9,107
KEPCO International Philippines
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	52,507	44,906	61,862
KEPCO Ilijan Corporation
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	53,900	50,849	57,979
KEPCO Philippines Holdings
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	26,023	17,747
KEPCO Neimenggu International
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	0	10,735
KOMIPO Global Pte
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	0	10,432
Qatrana Electric Power Company
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	6,240	5,939	8,331
KOSPO Jordan
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	0	1,095
KEPCO Energy Service Company
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	0	294
EWP Philippines Corporation
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	0	0
KEPCO Netherlands S3 B.V.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	3,115	0	0
PT. KOMIPO Pembangkitan Jawa Bali
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	20,658	3,188	3,222
KEPCO Netherlands J3 B.V.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	12,090	0	12,507
Gyeongju Wind Power
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	0	679
Energy New Industry Specialized Investment Private Investment Trust
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	291	0
HI Carbon Professional Private Special Asset Investment Trust 1
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	11	11	0
KOSPO Power Services Limitada
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	993	425	0
Cogentrix Solar Services
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	344	0
KEPCO Netherlands B.V.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	17,424	0	0
PT. Cirebon Power Service
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	382	0	0
Chitose Solar Power Plant LLC
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	₩ 1,986	₩ 0	₩ 0

Investments in Associates (Deta

Investments in Associates (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2018		Dec. 31, 2017
Disclosure of associates [Line Items]
Acquisition cost		₩ 2,338,421		₩ 2,240,761
Book value
Beginning balance		3,837,421		4,092,252
Acquisition		82,283		85,509
Disposal		0		(9,933)
Dividends received		(73,049)		(32,065)
Share of income (loss)		216,009		(212,629)
Other comprehensive income (loss)		14,148		(94,337)
Others (book value)		(11,992)		8,624
Ending balance		₩ 4,064,820		₩ 3,837,421
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],[2]	20.47%		20.47%
Acquisition cost	[1]	₩ 94,500		₩ 94,500
Book value
Beginning balance		1,618,868	[1]	1,933,877
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		107,952		(242,232)
Other comprehensive income (loss)		(24,843)		(72,648)
Others (book value)		(129)		(129)
Ending balance	[1]	1,701,848		1,618,868
The fair value of associates	[3]	910,980		804,195
Share in net assets		1,834,141		1,755,887
Total assets		39,689,692	[4]	37,139,439
Total liabilities		31,186,488	[4]	28,999,025
Net assets		8,503,204		8,140,414
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		(132,293)		(137,019)
Sales of Associates		26,185,038	[4]	22,172,305
Profit (loss) for the period of Associates		₩ 523,480	[4]	₩ (1,205,110)
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	[2]	29.00%		29.00%
Acquisition cost		₩ 4,727		₩ 4,727
Book value
Beginning balance		21,838		20,475
Acquisition		0		0
Disposal		0		0
Dividends received		(1,872)		(2,061)
Share of income (loss)		2,584		3,428
Other comprehensive income (loss)		(102)		102
Others (book value)		(610)		(106)
Ending balance		21,838		21,838
The fair value of associates		33,609		38,667
Share in net assets		21,838		21,838
Total assets		144,425		155,033
Total liabilities		69,123		79,730
Net assets		75,302		75,303
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		325,694		334,547
Profit (loss) for the period of Associates		₩ 9,987		₩ 16,126
YTN Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Broadcasting		Broadcasting
Location		KOREA		KOREA
Percentage of ownership	[2]	21.43%		21.43%
Acquisition cost		₩ 59,000		₩ 59,000
Book value
Beginning balance		40,606		38,156
Acquisition		0		0
Disposal		0		0
Dividends received		(180)		(135)
Share of income (loss)		545		1,095
Other comprehensive income (loss)		(186)		929
Others (book value)		(447)		561
Ending balance		40,338		40,606
The fair value of associates		18,900		18,855
Share in net assets		40,346		40,624
Total assets		286,964		298,122
Total liabilities		98,682		108,554
Net assets		188,282		189,568
Investment differential		0		0
Intercompany transaction		(6)		(18)
Others (consolidated FS)		(2)		0
Sales of Associates		132,382		131,080
Profit (loss) for the period of Associates		₩ 1,587		₩ 3,638
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	[2]	43.90%		43.90%
Acquisition cost		₩ 48,353		₩ 48,353
Book value
Beginning balance		8,337		12,373
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(4,872)		(4,036)
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		3,465		8,337
Share in net assets		1,015		5,893
Total assets		431,234		461,958
Total liabilities		428,921		448,535
Net assets		2,313		13,423
Investment differential		2,584		2,584
Intercompany transaction		(134)		(140)
Others (consolidated FS)		0		0
Sales of Associates		64,594		56,533
Profit (loss) for the period of Associates		₩ (11,110)		₩ (9,203)
Gangwon Wind Power Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities	[5]	Power generation		Power generation
Location	[5]	KOREA		KOREA
Percentage of ownership	[2],[5]	15.00%		15.00%
Acquisition cost	[5]	₩ 5,725		₩ 5,725
Book value
Beginning balance		13,855	[5]	13,069
Acquisition		0		0
Disposal		0		0
Dividends received		(2,272)		(852)
Share of income (loss)		1,637		1,638
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance	[5]	13,220		13,855
Share in net assets		13,171		13,806
Total assets		89,614		94,281
Total liabilities		1,805		2,243
Net assets		87,809		92,038
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		49		49
Sales of Associates		25,407		25,963
Profit (loss) for the period of Associates		₩ 10,926		₩ 11,121
Hyundai Green Power Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership	[2]	29.00%		29.00%
Acquisition cost		₩ 88,885		₩ 88,885
Book value
Beginning balance		114,806		115,998
Acquisition		0		0
Disposal		0		0
Dividends received		(8,889)		(8,889)
Share of income (loss)		21,243		7,697
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		127,160		114,806
Share in net assets		127,160		114,806
Total assets		1,127,220		1,150,729
Total liabilities		688,738		754,846
Net assets		438,482		395,883
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		501,798		477,373
Profit (loss) for the period of Associates		₩ 66,925		₩ 26,543
Shareholders' agreements that may cause future economic resource or cash outflows		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.		As of December 31, 2017, 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 KRW919.2 billion with Korea Development Bank and others. At a certain period in the future, the Company has an appraisal right against the financial investors (Korea Development Bank and others) and also has an obligation to sell its shares when claimed by the financial investors. At a certain period in the future, the Company has an appraisal right 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 when claimed by Hyundai Steel Company.
Korea Power Exchange
Disclosure of associates [Line Items]
Key operation activities	[6]	Management of power market and others		Management of power market and others
Location	[6]	KOREA		KOREA
Percentage of ownership	[2],[6]	100.00%		100.00%
Acquisition cost	[6]	₩ 127,839		₩ 127,839
Book value
Beginning balance		237,631	[6]	223,238
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		16,031		8,831
Other comprehensive income (loss)		0		0
Others (book value)		(1,860)		5,562
Ending balance	[6]	251,802		237,631
Share in net assets		251,802		237,631
Total assets		304,318		263,499
Total liabilities		52,516		25,868
Net assets		251,802		237,631
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		108,571		105,107
Profit (loss) for the period of Associates		₩ 16,031		₩ 8,831
AMEC Partners Korea Ltd.
Disclosure of associates [Line Items]
Key operation activities	[7]	Resources development		Resources development
Location	[7]	KOREA		KOREA
Percentage of ownership	[2],[7]	19.00%		19.00%
Acquisition cost	[7]	₩ 707		₩ 707
Book value
Beginning balance		215	[7]	225
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(6)		(10)
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance	[7]	209		215
Share in net assets		209		215
Total assets		1,113		1,135
Total liabilities		14		4
Net assets		1,099		1,131
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		0		1
Profit (loss) for the period of Associates		₩ (26)		₩ (53)
Hyundai Energy
Disclosure of associates [Line Items]
Key operation activities		Power generation	[8]	Power generation	[9]
Location		KOREA	[8]	KOREA	[9]
Percentage of ownership	[2]	30.66%		30.66%	[9]
Acquisition cost		₩ 71,070	[8]	₩ 71,070	[9]
Book value
Beginning balance		0	[9]	1,031
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		0		(3,498)
Other comprehensive income (loss)		0		0
Others (book value)		0		2,467
Ending balance		0	[8]	0	[9]
Share in net assets		(26,285)		(16,921)
Total assets		470,818		474,939
Total liabilities		527,590		511,486
Net assets		(56,772)		(36,547)
Investment differential		0		0
Intercompany transaction		(996)		(1,037)
Others (consolidated FS)		27,281		17,958
Sales of Associates		101,998		92,992
Profit (loss) for the period of Associates		₩ (33,947)		₩ (43,317)
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	[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		589		614
Total assets		1,944		2,052
Total liabilities		312		352
Net assets		1,632		1,700
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		(589)		(614)
Sales of Associates		0		0
Profit (loss) for the period of Associates		₩ (68)		₩ (121)
Taebaek Wind Power Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership	[2]	25.00%		25.00%
Acquisition cost		₩ 3,810		₩ 3,810
Book value
Beginning balance		5,319		4,750
Acquisition		0		0
Disposal		0		0
Dividends received		(196)		0
Share of income (loss)		542		569
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		5,665		5,319
Share in net assets		5,665		5,319
Total assets		36,986		39,227
Total liabilities		14,325		17,953
Net assets		22,661		21,274
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		8,233		7,056
Profit (loss) for the period of Associates		₩ 2,170		₩ 2,312
Shareholders' agreements that may cause future economic resource or cash outflows		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.		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.		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. (formerly, Muju Wind Power Co., Ltd.)
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership	[2]	25.00%		25.00%
Acquisition cost		₩ 3,420		₩ 3,420
Book value
Beginning balance		3,089		3,131
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(520)		(42)
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		2,569		3,089
Share in net assets		2,569		3,089
Total assets		10,929		12,369
Total liabilities		653		12
Net assets		10,276		12,357
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		₩ (2,082)		₩ (140)
Pyeongchang Wind Power Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership	[2]	25.00%		25.00%
Acquisition cost		₩ 3,875		₩ 3,875
Book value
Beginning balance		4,136		3,383
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		1,283		753
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		5,419		4,136
Share in net assets		5,419		4,136
Total assets		82,038		77,152
Total liabilities		60,362		60,606
Net assets		21,676		16,546
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		12,615		11,907
Profit (loss) for the period of Associates		₩ 4,249		₩ 3,038
Shareholders' agreements that may cause future economic resource or cash outflows		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.		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.		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	[7]	Power generation		Power generation	[10]
Location	[7]	KOREA		KOREA	[10]
Percentage of ownership	[2],[7]	9.34%		13.13%	[10]
Acquisition cost	[7]	₩ 40,854		₩ 25,477	[10]
Book value
Beginning balance		25,113	[7],[10]	29,873
Acquisition		0	[11]	0
Disposal		0	[11]	0
Dividends received		0	[11]	0
Share of income (loss)		(189)	[11]	(4,762)
Other comprehensive income (loss)		184	[11]	0
Others (book value)		991	[11]	2
Ending balance	[7]	26,099	[11]	25,113	[10]
Share in net assets		26,919		24,095
Total assets		798,569		779,258
Total liabilities		510,358		655,377
Net assets		288,211		123,881
Investment differential		0		1,014
Intercompany transaction		0		0
Others (consolidated FS)		(820)		4
Sales of Associates		62,252		156,508
Profit (loss) for the period of Associates		₩ (4,958)		₩ (23,978)
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.		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	[2]	30.00%		30.00%
Acquisition cost		₩ 3,801		₩ 3,801
Book value
Beginning balance		7,515		6,930
Acquisition		0		0
Disposal		0		0
Dividends received		(416)		(111)
Share of income (loss)		987		696
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		8,086		7,515
Share in net assets		8,086		7,515
Total assets		33,148		35,794
Total liabilities		6,194		10,745
Net assets		26,954		25,049
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		7,929		6,981
Profit (loss) for the period of Associates		₩ 3,291		₩ 2,317
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.		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	[2]	27.00%		27.00%
Acquisition cost		₩ 1,296		₩ 1,296
Book value
Beginning balance		2,218		2,073
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		119		145
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		2,337		2,218
Share in net assets		2,337		2,218
Total assets		22,598		24,432
Total liabilities		13,942		16,215
Net assets		8,656		8,217
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		3,586		3,947
Profit (loss) for the period of Associates		₩ 439		₩ 628
Significant restrictions on its abilities		Principal and interest, dividends to shareholders cannot be paid without written consent of financial institutions.		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	[2]	38.00%		38.00%
Acquisition cost		₩ 20,635		₩ 20,635
Book value
Beginning balance		52,283		56,818
Acquisition		0		0
Disposal		0		0
Dividends received		(9,549)		(5,562)
Share of income (loss)		4,235		4,310
Other comprehensive income (loss)		10,578		(3,276)
Others (book value)		11		(7)
Ending balance		57,558		52,283
The fair value of associates		72,710		72,616
Share in net assets		79,336		52,283
Total assets		225,599		137,586
Total liabilities		16,819
Net assets		208,780		137,586
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		(21,778)		0
Sales of Associates		50,317		68,149
Profit (loss) for the period of Associates		₩ 37,355		₩ 37,395
Gemeng International Energy Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		CHINA		CHINA
Percentage of ownership	[2]	34.00%		34.00%
Acquisition cost		₩ 413,153		₩ 413,153
Book value
Beginning balance		649,973		680,065
Acquisition		0		0
Disposal		0		0
Dividends received		(11,246)		(13,365)
Share of income (loss)		15,156		6,953
Other comprehensive income (loss)		(6,873)		(23,680)
Others (book value)		0
Ending balance		647,010		649,973
Share in net assets		930,028		649,973
Total assets		7,155,937		6,496,294
Total liabilities		4,420,561		4,584,608
Net assets		2,735,376		1,911,686
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		(283,018)		0
Sales of Associates		1,921,367		1,334,833
Profit (loss) for the period of Associates		₩ 120,558		₩ 21,769
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 Company 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	[2]	27.50%		27.50%
Acquisition cost		₩ 40,365		₩ 40,365
Book value
Beginning balance		97,410		96,658
Acquisition		0
Disposal		0
Dividends received		(4,432)		(550)
Share of income (loss)		9,385		10,685
Other comprehensive income (loss)		6,265		2,232
Others (book value)		0		(11,615)
Ending balance		108,628		97,410
Share in net assets		108,628		97,410
Total assets		876,069		903,429
Total liabilities		481,061		549,212
Net assets		395,008		354,217
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		274,962		280,452
Profit (loss) for the period of Associates		₩ 33,144		₩ 38,448
KNOC Nigerian East Oil
Disclosure of associates [Line Items]
Key operation activities	[12]	Resources development		Resources development
Location	[12]	NIGERIA		NIGERIA
Percentage of ownership	[2],[12]	14.63%		14.63%
Acquisition cost	[12]	₩ 12		₩ 12
Book value
Beginning balance		0	[12]	0
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		2,615		(1,914)
Other comprehensive income (loss)		(471)		1,536
Others (book value)		(2,144)		378
Ending balance	[12]	0		0
Share in net assets		(10,706)		(12,850)
Total assets		78,841		241,808
Total liabilities		152,017		329,639
Net assets		(73,176)		(87,831)
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		10,706		12,850
Sales of Associates		0		0
Profit (loss) for the period of Associates		₩ (398)		₩ (10,754)
KNOC Nigerian West Oil
Disclosure of associates [Line Items]
Key operation activities	[12]	Resources development		Resources development
Location	[12]	NIGERIA		NIGERIA
Percentage of ownership	[2],[12]	14.63%		14.63%
Acquisition cost	[12]	₩ 12		₩ 12
Book value
Beginning balance		0	[12]	0
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		2,342		(1,712)
Other comprehensive income (loss)		(414)		1,407
Others (book value)		(1,928)		305
Ending balance	[12]	0		0
Share in net assets		(9,835)		(11,763)
Total assets		70,437		147,185
Total liabilities		137,663		227,588
Net assets		(67,226)		(80,403)
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		9,835		11,763
Sales of Associates		0		0
Profit (loss) for the period of Associates		₩ (400)		₩ (9,768)
PT Wampu Electric Power
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		INDONESIA		INDONESIA
Percentage of ownership	[2]	46.00%		46.00%
Acquisition cost		₩ 21,292		₩ 21,292
Book value
Beginning balance		29,403		23,188
Acquisition		0
Disposal		0
Dividends received		0
Share of income (loss)		408		9,336
Other comprehensive income (loss)		1,286
Others (book value)		0		(3,121)
Ending balance		31,097		29,403
Share in net assets		31,097		29,403
Total assets		223,009		212,095
Total liabilities		155,406		148,177
Net assets		67,603		63,918
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		13,463		779
Profit (loss) for the period of Associates		₩ 4,624		₩ 8,114
PT. Bayan Resources TBK
Disclosure of associates [Line Items]
Key operation activities		Resources development		Resources development
Location		INDONESIA		INDONESIA
Percentage of ownership	[2]	20.00%		20.00%
Acquisition cost		₩ 615,860		₩ 615,860
Book value
Beginning balance		451,831		402,667
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(33,651)		34,122
Other comprehensive income (loss)		74,776		14,982
Others (book value)		18,690		60
Ending balance		511,646		451,831
The fair value of associates		1,017,601		558,267
Share in net assets		164,262		70,245
Total assets		1,388,199		908,106
Total liabilities		566,890		556,881
Net assets		821,309		351,225
Investment differential		423,763		482,109
Intercompany transaction		0		0
Others (consolidated FS)		(76,379)		(100,523)
Sales of Associates		1,707,387		811,515
Profit (loss) for the period of Associates		₩ 521,666		₩ 243,621
S-Power Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership	[2]	49.00%		49.00%
Acquisition cost		₩ 132,300		₩ 132,300
Book value
Beginning balance		116,945		123,912
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(2,326)		(6,982)
Other comprehensive income (loss)		0		0
Others (book value)		(53)		15
Ending balance		114,566		116,945
Share in net assets		116,293		118,780
Total assets		825,354		859,633
Total liabilities		588,022		617,224
Net assets		237,332		242,409
Investment differential		0		0
Intercompany transaction		(1,727)		(1,835)
Others (consolidated FS)		0		0
Sales of Associates		551,378		489,042
Profit (loss) for the period of Associates		₩ (6,185)		₩ (14,470)
Pioneer Gas Power Limited
Disclosure of associates [Line Items]
Key operation activities	[13]	Power generation		Power generation
Location	[13]	INDIA		INDIA
Percentage of ownership	[2],[13]	38.50%		38.50%
Acquisition cost	[13]	₩ 49,831		₩ 49,831
Book value
Beginning balance		38,659	[13]	50,740
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(17,684)		(11,119)
Other comprehensive income (loss)		(580)		(1,238)
Others (book value)		0		276
Ending balance	[13]	20,395		38,659
Share in net assets		(1,951)		16,314
Total assets		311,742		339,271
Total liabilities		316,810		296,898
Net assets		(5,068)		42,373
Investment differential		22,278		22,278
Intercompany transaction		0		0
Others (consolidated FS)		68		67
Sales of Associates		0		8,215
Profit (loss) for the period of Associates		₩ (45,934)		₩ (27,796)
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	[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		(179)		(172)
Total assets		572		548
Total liabilities		1,020		978
Net assets		(448)		(430)
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		179		172
Sales of Associates		0		0
Profit (loss) for the period of Associates		0		0
Unrecognized equity interest		7		(22)
Accumulated unrecognized equity interest		₩ 179		₩ 172
Xe-Pian Xe-Namnoy Power
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		LAOS		LAOS
Percentage of ownership	[2]	25.00%		25.00%
Acquisition cost		₩ 84,374		₩ 71,481
Book value
Beginning balance		61,779		51,544
Acquisition		12,893		22,362
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(479)		(4,264)
Other comprehensive income (loss)		2,972		(7,863)
Others (book value)		0
Ending balance		77,165		61,779
Share in net assets		78,207		62,832
Total assets		1,015,013		858,789
Total liabilities		702,187		607,462
Net assets		312,826		251,327
Investment differential		253		74
Intercompany transaction		(1,006)		(838)
Others (consolidated FS)		(289)		(289)
Sales of Associates		0		0
Profit (loss) for the period of Associates		₩ (1,214)		₩ (16,677)
Hadong Mineral Fiber Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities	[7]	Recycling fly ashes		Recycling fly ashes
Location	[7]	KOREA		KOREA
Percentage of ownership	[2],[7]	8.33%		8.33%
Acquisition cost	[7]	₩ 50		₩ 50
Book value
Beginning balance		0	[7]	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	[7]	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		(260)
Unrecognized equity interest		0		(3)
Accumulated unrecognized equity interest		₩ 2		₩ 2
Green Biomass Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities	[14]	Power generation		Power generation	[15]
Location	[14]	KOREA		KOREA	[15]
Percentage of ownership	[2],[14]	8.80%		8.80%	[15]
Acquisition cost	[14]	₩ 714		₩ 714	[15]
Book value
Beginning balance		208	[14],[15]	47
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(93)		(112)
Other comprehensive income (loss)		0		0
Others (book value)		0		273
Ending balance	[14]	115		208	[15]
Share in net assets		115		208
Total assets		4,411		6,379
Total liabilities		3,107		4,018
Net assets		1,304		2,361
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		909		2,337
Profit (loss) for the period of Associates		₩ (1,057)		₩ (956)
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	[2]	29.00%		29.00%
Acquisition cost		₩ 2,978		₩ 2,978
Book value
Beginning balance		0		0
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		349		0
Other comprehensive income (loss)		16		0
Others (book value)		0		0
Ending balance		365		0
Share in net assets		365		(746)
Total assets		24,022		27,098
Total liabilities		22,763		29,670
Net assets		1,259		(2,572)
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		746
Sales of Associates		14,393		13,574
Profit (loss) for the period of Associates		3,917		3,455
Unrecognized equity interest		(746)		(1,159)
Accumulated unrecognized equity interest		₩ 0		₩ 746
Samcheok Eco Materials Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities	[16]	Recycling fly ashes		Recycling fly ashes
Location	[16]	KOREA		KOREA
Percentage of ownership	[2],[16]	2.35%		2.35%
Acquisition cost	[16]	₩ 686		₩ 686
Book value
Beginning balance		0	[16]	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	[16]	0		0
Share in net assets		505		551
Total assets		24,391		23,729
Total liabilities		2,921		270
Net assets		21,470		23,459
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		(505)		(551)
Sales of Associates		4,135		15
Profit (loss) for the period of Associates		(1,836)		(541)
Unrecognized equity interest		1,285		0
Accumulated unrecognized equity interest		₩ 1,285		₩ 0
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.
Noeul Green Energy Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership	[2]	29.00%		29.00%
Acquisition cost		₩ 1,740		₩ 1,740
Book value
Beginning balance		2,067		1,217
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		5,687		850
Other comprehensive income (loss)		0		0
Others (book value)		261		0
Ending balance		8,015		2,067
Share in net assets		8,015		2,067
Total assets		147,886		127,980
Total liabilities		120,249		120,852
Net assets		27,637		7,128
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		58,686		43,099
Profit (loss) for the period of Associates		₩ 19,453		₩ 2,932
Naepo Green Energy Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership	[2]	41.67%		25.00%
Acquisition cost		₩ 29,200		₩ 29,200
Book value
Beginning balance		20,598	[17]	25,438
Acquisition		0	[18]	0	[17]
Disposal		0	[18]	0	[17]
Dividends received		0	[18]	0	[17]
Share of income (loss)		(13,511)	[18]	(1,400)	[17]
Other comprehensive income (loss)		0	[18]	0	[17]
Others (book value)		(7,087)	[18]	(3,440)	[17]
Ending balance		0	[18]	20,598	[17]
Share in net assets		7,085		20,598
Total assets		93,194		121,375
Total liabilities		76,190		71,945
Net assets		17,004		49,430
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		(7,085)		0
Sales of Associates		6,459		5,696
Profit (loss) for the period of Associates		₩ (6,623)		₩ (5,603)
Goseong Green Energy Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities	[5]	Power generation		Power generation
Location	[5]	KOREA		KOREA
Percentage of ownership	[2],[5]	1.12%		1.12%
Acquisition cost	[5]	₩ 2,900		₩ 2,900
Book value
Beginning balance		2,597	[5]	2,663
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(138)		(66)
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance	[5]	2,459		2,597
Share in net assets		2,590		2,676
Total assets		1,891,662		1,081,238
Total liabilities		1,659,415		841,330
Net assets		232,247		239,908
Investment differential		0		0
Intercompany transaction		(131)		(79)
Others (consolidated FS)		0		0
Sales of Associates		0		0
Profit (loss) for the period of Associates		₩ (7,323)		₩ (5,811)
Gangneung Eco Power Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities	[5]	Power generation		Power generation
Location	[5]	KOREA		KOREA
Percentage of ownership	[2],[5]	1.61%		1.61%
Acquisition cost	[5]	₩ 2,900		₩ 2,900
Book value
Beginning balance		2,583	[5]	2,646
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(88)		(63)
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance	[5]	2,495		2,583
Share in net assets		2,615		2,681
Total assets		813,938		186,765
Total liabilities		651,621		20,344
Net assets		162,317		166,421
Investment differential		0		0
Intercompany transaction		(120)		(98)
Others (consolidated FS)		0		0
Sales of Associates		0		0
Profit (loss) for the period of Associates		₩ (4,194)		₩ (3,407)
Shin Pyeongtaek Power Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership	[2]	40.00%		40.00%
Acquisition cost		₩ 72,000		₩ 43,920
Book value
Beginning balance		34,903		0
Acquisition		28,080		43,880
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(2,946)		(10,998)
Other comprehensive income (loss)		6,673		(3,617)
Others (book value)		890		5,638
Ending balance		67,600		34,903
Share in net assets		65,007		34,083
Total assets		674,100		175,870
Total liabilities		511,582		90,662
Net assets		162,518		85,208
Investment differential		12,800		7,808
Intercompany transaction		(10,207)		(6,988)
Others (consolidated FS)		0		0
Sales of Associates		0		0
Profit (loss) for the period of Associates		682		(4,585)
Unrecognized equity interest		0		(2,537)
Accumulated unrecognized equity interest		₩ 0		₩ 0
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	[2]	28.00%		28.00%
Acquisition cost		₩ 194		₩ 194
Book value
Beginning balance		187		181
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		15		6
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		202		187
Share in net assets		200		185
Total assets		2,630		2,782
Total liabilities		1,915		2,120
Net assets		715		662
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		2		2
Sales of Associates		455		451
Profit (loss) for the period of Associates		52		₩ 22
DS POWER Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities				Power generation
Location				KOREA
Book value
Beginning balance		₩ 0	[19]	₩ 7,190
Acquisition	[19]			0
Disposal	[19]			0
Dividends received	[19]			0
Share of income (loss)	[19]			(1,321)
Other comprehensive income (loss)	[19]			0
Others (book value)	[19]			(5,869)
Ending balance	[19]			₩ 0
Dongducheon Dream Power Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation	[20]	Power generation
Location		KOREA	[20]	KOREA
Percentage of ownership	[2]	33.61%	[20]	33.61%
Acquisition cost		₩ 148,105	[20]	₩ 111,134
Book value
Beginning balance		53,233	[21],[22]	46,876
Acquisition		36,971		0	[21],[22]
Disposal		0		0	[21],[22]
Dividends received		0		0	[21],[22]
Share of income (loss)		(13,824)		(10,980)	[21],[22]
Other comprehensive income (loss)		0
Others (book value)		6		17,337	[21],[22]
Ending balance		76,386	[20]	53,233	[21],[22]
Share in net assets		91,260		70,356
Total assets		1,512,510		1,575,175
Total liabilities		1,244,178		1,365,845
Net assets		268,332		209,330
Investment differential		1,757		0
Intercompany transaction		(4,049)		(4,409)
Others (consolidated FS)		(12,582)		(12,714)
Sales of Associates		828,430		813,440
Profit (loss) for the period of Associates		(22,864)		₩ (33,740)
KS Solar Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities				Power generation
Location				KOREA
Book value
Beginning balance		₩ 0		₩ 604
Acquisition				0
Disposal				(613)
Dividends received				0
Share of income (loss)				0
Other comprehensive income (loss)				9
Others (book value)				0
Ending balance				₩ 0
Jinbhuvish Power Generation Pvt. Ltd.
Disclosure of associates [Line Items]
Key operation activities	[5]	Power generation		Power generation
Location	[5]	INDIA		INDIA
Percentage of ownership	[2],[5]	5.16%		5.16%
Acquisition cost	[5]	₩ 9,000		₩ 9,000
Book value
Beginning balance		0	[5]	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	[5]	0		0
Share in net assets		2,586		2,704
Total assets		63,163		66,047
Total liabilities		13,044		13,640
Net assets		50,119		52,407
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		(2,586)		(2,704)
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	[2]	47.76%		47.76%
Acquisition cost		₩ 3,821		₩ 3,821
Book value
Beginning balance		3,476		3,525
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(110)		(49)
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		3,366		3,476
Share in net assets		3,366		3,476
Total assets		7,048		7,278
Total liabilities		0
Net assets		7,048		7,278
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		₩ (230)		₩ (103)
Daegu Photovoltaic Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership	[2]	29.00%		29.00%
Acquisition cost		₩ 1,230		₩ 1,230
Book value
Beginning balance		1,718		1,700
Acquisition		0		0
Disposal		0		0
Dividends received		(128)		(349)
Share of income (loss)		412		367
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		2,002		1,718
Share in net assets		2,002		1,718
Total assets		16,828		17,262
Total liabilities		9,923		11,339
Net assets		6,905		5,923
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		3,695		3,714
Profit (loss) for the period of Associates		₩ 1,645		₩ 1,263
Jeongam Wind Power Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership	[2]	40.00%		40.00%
Acquisition cost		₩ 5,580		₩ 5,580
Book value
Beginning balance		3,763		4,000
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		826		(237)
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		4,589		3,763
Share in net assets		4,589		3,763
Total assets		93,444		67,427
Total liabilities		81,971		58,019
Net assets		11,473		9,408
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		1,559		0
Profit (loss) for the period of Associates		₩ 2,154		₩ (580)
Shareholders' agreements that may cause future economic resource or cash outflows		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		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.
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	[2]	29.00%		29.00%
Acquisition cost		₩ 290		₩ 290
Book value
Beginning balance		3,659		2,810
Acquisition		0		0
Disposal		0		0
Dividends received		(218)		(191)
Share of income (loss)		929		1,030
Other comprehensive income (loss)		0		0
Others (book value)		(37)		10
Ending balance		4,333		3,659
Share in net assets		4,333		3,659
Total assets		18,609		15,738
Total liabilities		3,666		3,121
Net assets		14,943		12,617
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		20,809		22,283
Profit (loss) for the period of Associates		₩ 3,207		₩ 3,783
Busan Green Energy Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership	[2]	29.00%		29.00%
Acquisition cost		₩ 5,243		₩ 5,243
Book value
Beginning balance		7,363		13,803
Acquisition		0		0
Disposal		0		(9,320)
Dividends received		0		0
Share of income (loss)		5,037		2,884
Other comprehensive income (loss)		0
Others (book value)		137		(4)
Ending balance		12,537		7,363
Share in net assets		12,537		7,363
Total assets		195,227		193,253
Total liabilities		151,995		167,864
Net assets		43,232		25,389
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		77,011		34,280
Profit (loss) for the period of Associates		₩ 17,370		₩ 9,946
Gunsan Bio Energy Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities	[5]	Power generation		Power generation
Location	[5]	KOREA		KOREA
Percentage of ownership	[2],[5]	18.87%		18.87%
Acquisition cost	[5]	₩ 1,000		₩ 1,000
Book value
Beginning balance		0	[5]	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	[5]	0		0
Share in net assets		(2,202)		(1,286)
Total assets		8,990		9,648
Total liabilities		20,660		16,462
Net assets		(11,670)		(6,814)
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		2,202		1,286
Sales of Associates		0		0
Profit (loss) for the period of Associates		(4,420)		(6,109)
Unrecognized equity interest		916		1,154
Accumulated unrecognized equity interest		₩ 2,202		₩ 1,286
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	[2]	28.00%		28.00%
Acquisition cost		₩ 2,800		₩ 2,604
Book value
Beginning balance		1,749		1,103
Acquisition		196		1,008
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(352)		(362)
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		1,593		1,749
Share in net assets		1,593		1,749
Total assets		15,019		14,650
Total liabilities		9,328		8,404
Net assets		5,691		6,246
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		8,615		8,399
Profit (loss) for the period of Associates		₩ (1,056)		₩ (1,295)
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	[2]	29.85%		29.85%
Acquisition cost		₩ 8,000		₩ 8,000
Book value
Beginning balance		6,370		6,894
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(1,749)		(524)
Other comprehensive income (loss)		0		0
Others (book value)		7		0
Ending balance		4,628		6,370
Share in net assets		4,629		6,370
Total assets		17,134		25,842
Total liabilities		1,625		4,501
Net assets		15,509		21,341
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		(1)		0
Sales of Associates		0		0
Profit (loss) for the period of Associates		₩ (5,855)		₩ (1,758)
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	[2]	29.00%		29.00%
Acquisition cost		₩ 290		₩ 290
Book value
Beginning balance		383		248
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(208)		135
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		175		383
Share in net assets		175		383
Total assets		615		2,033
Total liabilities		12		711
Net assets		603		1,322
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		80		1,345
Profit (loss) for the period of Associates		₩ (707)		₩ 465
Tamra Offshore Wind Power Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership	[2]	27.00%		27.00%
Acquisition cost		₩ 8,910		₩ 8,910
Book value
Beginning balance		8,560		7,015
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		1,841		1,545
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		10,401		8,560
Share in net assets		10,401		8,560
Total assets		170,238		163,740
Total liabilities		131,717		132,036
Net assets		38,521		31,704
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		21,701		4,392
Profit (loss) for the period of Associates		₩ 4,077		₩ (191)
Korea Electric Power Corporation Fund
Disclosure of associates [Line Items]
Key operation activities	[23]	Developing electric enterprises		Developing electric enterprises
Location	[23]	KOREA		KOREA
Percentage of ownership	[2],[23]	98.09%		98.09%
Acquisition cost	[23]	₩ 51,500		₩ 51,500
Book value
Beginning balance		47,974	[23]	50,856
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(505)		(2,171)
Other comprehensive income (loss)		(280)		(711)
Others (book value)		0		0
Ending balance	[23]	47,189		47,974
Share in net assets		47,185		47,971
Total assets		48,280		49,170
Total liabilities		176		265
Net assets		48,104		48,905
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		4		3
Sales of Associates		1,315		666
Profit (loss) for the period of Associates		₩ (649)		₩ (2,213)
Energy Infra Asset Management Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities	[7]	Asset management		Asset management
Location	[7]	KOREA		KOREA
Percentage of ownership	[2],[7]	9.90%		9.90%
Acquisition cost	[7]	₩ 297		₩ 297
Book value
Beginning balance		476	[7]	259
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		189		217
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance	[7]	665		476
Share in net assets		665		476
Total assets		7,225		5,240
Total liabilities		507		431
Net assets		6,718		4,809
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		5,757		5,807
Profit (loss) for the period of Associates		₩ 2,193		₩ 2,203
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	[2]	28.00%		28.00%
Acquisition cost		₩ 140		₩ 140
Book value
Beginning balance		11		140
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		6		(129)
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		17		11
Share in net assets		17		11
Total assets		389		252
Total liabilities		328		212
Net assets		61		40
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		₩ (190)		₩ (460)
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	[2]	29.00%		29.00%
Acquisition cost		₩ 210		₩ 210
Book value
Beginning balance		194		196
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		266		(2)
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		460		194
Share in net assets		458		193
Total assets		7,525		7,105
Total liabilities		5,944		6,437
Net assets		1,581		668
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		2		1
Sales of Associates		2,094		381
Profit (loss) for the period of Associates		₩ 1,259		₩ (6)
Nepal Water & Energy Development Company Private Limited
Disclosure of associates [Line Items]
Key operation activities	[24]	Construction and operation of utility plant		Construction and operation of utility plant
Location	[24]	NEPAL		NEPAL
Percentage of ownership	[2],[24]	57.67%		62.13%
Acquisition cost	[24]	₩ 33,577		₩ 33,577
Book value
Beginning balance		30,498	[24]	18,667
Acquisition		0		15,009
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(770)		(677)
Other comprehensive income (loss)		1,233		(2,501)
Others (book value)		0		0
Ending balance	[24]	30,961		30,498
Share in net assets		29,529		28,860
Total assets		55,453		58,121
Total liabilities		4,249		11,670
Net assets		51,204		46,451
Investment differential		972		972
Intercompany transaction		0		0
Others (consolidated FS)		460		666
Sales of Associates		0		0
Profit (loss) for the period of Associates		₩ (984)		₩ (968)
Gwangyang Green Energy Co., Ltd
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership	[2]	20.00%		20.00%
Acquisition cost		₩ 2,000		₩ 2,000
Book value
Beginning balance		1,772		0
Acquisition		0		2,000
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(566)		(228)
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		1,206		1,772
Share in net assets		1,188		1,754
Total assets		29,234		20,165
Total liabilities		23,293		11,393
Net assets		5,941		8,772
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		₩ (2,831)		₩ 0
PND solar., Ltd
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership	[2]	29.00%		29.00%
Acquisition cost		₩ 1,250		₩ 1,250
Book value
Beginning balance		1,250		0
Acquisition		0		1,250
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(230)		0
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		1,020		1,250
Share in net assets		866		1,096
Total assets		42,283		10,508
Total liabilities		39,297		6,729
Net assets		2,986		3,779
Investment differential		154		154
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		1,094		0
Profit (loss) for the period of Associates		₩ (795)		₩ 0
Hyundai Eco Energy Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities	[5]	Power generation
Location	[5]	KOREA
Percentage of ownership	[2],[5]	19.00%
Acquisition cost	[5]	₩ 3,610
Book value
Acquisition		3,610
Disposal		0
Dividends received		0
Share of income (loss)		(222)
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance	[5]	3,388
Share in net assets		3,174
Total assets		165,555
Total liabilities		148,852
Net assets		16,703
Investment differential		214
Intercompany transaction		0
Others (consolidated FS)		0
Sales of Associates		0
Profit (loss) for the period of Associates		(2,193)
Unrecognized equity interest		25,841
Accumulated unrecognized equity interest		₩ 25,841
YeongGwang Yaksu Wind Electric. Co., Ltd
Disclosure of associates [Line Items]
Key operation activities	[5]	Power generation
Location	[5]	KOREA
Percentage of ownership	[2],[5]	9.63%
Acquisition cost	[5]	₩ 533
Book value
Acquisition		533
Disposal		0
Dividends received		0
Share of income (loss)		0
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance	[5]	533
Share in net assets		233
Total assets		46,027
Total liabilities		43,606
Net assets		2,421
Investment differential		300
Intercompany transaction		0
Others (consolidated FS)		0
Sales of Associates		7,604
Profit (loss) for the period of Associates		₩ (493)
Shareholders' agreements that may cause future economic resource or cash outflows		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.
[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]	The carrying amount of Korea Gas Corporation ("KOGAS") is KRW1,701,848 million as of December 31, 2018 and management has determined that there is objective evidence of impairment. As a result of the impairment test, the Company has not recognized any impairment loss as the value in use is greater than the carrying amount. The recoverable amount of KOGAS based on its value in use is calculated by considering the long-term natural gas supply and demand programs of future cash flows approved by Ministry of Trade, Industry & Energy and the discount rate of 4.80%.
[4]	The profit for the year ended December 31, 2018 is net of net income attributable to non-controlling interests.
[5]	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.
[6]	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.
[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]	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]	As of December 31, 2017, 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]	The effective percentage of ownership is 19.45% considering stock purchase options.
[11]	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.
[12]	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.
[13]	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.
[14]	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.
[15]	The percentage of ownership decreased since the Company did not participate in the capital increase of Green Biomass Co., Ltd. during the period.
[16]	The Company's effective percentage of ownership excluding the redeemable convertible preferred stock is 25.54%.
[17]	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 KRW3,440 million in impairment loss on investments in associates and joint ventures for the year ended December 31, 2017.
[18]	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.
[19]	'Others' include KRW4,438 million of assets held-for-sale (note 45), and also include KRW1,439 million of available-for-sale financial assets which is reclassified due to loss of significant influence.
[20]	The effective percentage of ownership is 34.01% considering redeemable convertible preferred stock.
[21]	'Others' include KRW41,170 million of assets held-for-sale (note 45).
[22]	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 KRW23,798 million in impairment loss on investments in associates and joint ventures for the year ended December 31, 2017.
[23]	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.
[24]	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.

Investments in Joint Ventures (

Investments in Joint Ventures (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2018		Dec. 31, 2017
Disclosure of joint ventures [Line Items]
Acquisition cost		₩ 1,647,317		₩ 1,469,978
Book value [Abstract]
Beginning balance		1,493,275		1,418,196
Acquisition		237,142		121,244
Disposal		(1,632)		0
Dividends received		(102,126)		(74,918)
Share of income (loss)		147,092		130,941
Other comprehensive income (loss)		40,985		(101,175)
Others (book value)		(1,211)		(1,013)
Ending balance		₩ 1,813,525		₩ 1,493,275
KEPCO-Uhde Inc.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation	[1]	Power generation	[2]
Location		KOREA	[1]	KOREA	[2]
Percentage of ownership	[3]	52.80%	[1]	52.80%	[2]
Acquisition cost		₩ 11,355	[1]	₩ 11,355	[2]
Book value [Abstract]
Beginning balance		258	[2]	301
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(70)		(43)
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		188	[1]	258	[2]
Share in net assets		188		258
Total assets		403		515
Total liabilities		34		7
Net assets		369		508
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		18		0
Profit (loss) for the period of JointVentures		₩ (139)		₩ (86)
Eco Biomass Energy Sdn. Bhd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation	[1]	Power generation	[2]
Location		MALAYSIA	[1]	MALAYSIA	[2]
Percentage of ownership	[3]	61.53%	[1]	61.53%	[2]
Acquisition cost		₩ 14,439	[1]	₩ 14,439	[2]
Book value [Abstract]
Beginning balance		0	[2]	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	[1]	₩ 0	[2]
Share in net assets		0
Total assets		0
Total liabilities		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.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		CHINA		CHINA
Percentage of ownership	[3]			40.00%
Acquisition cost				₩ 27,660
Book value [Abstract]
Beginning balance		₩ 27,262		28,239
Acquisition		0	[4]	0
Disposal		0	[4]	0
Dividends received		0	[4]	(839)
Share of income (loss)		743	[4]	840
Other comprehensive income (loss)		1,009	[4]	(978)
Others (book value)		(29,014)	[4]	0
Ending balance		₩ 0	[4]	27,262
Share in net assets				27,262
Total assets				138,463
Total liabilities				70,309
Net assets				68,154
Sales of JointVentures				17,776
Profit (loss) for the period of JointVentures				₩ 2,149
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	[3]	49.00%		49.00%
Acquisition cost		₩ 44,405		₩ 46,037
Book value [Abstract]
Beginning balance		15,675		0
Acquisition		0		0
Disposal		(1,632)		0
Dividends received		(499)		(1,707)
Share of income (loss)		3,075		4,275
Other comprehensive income (loss)		10,632		12,457
Others (book value)		0		650
Ending balance		27,251		15,675
Share in net assets		27,251		15,675
Total assets		55,614		32,001
Total liabilities		0		10
Net assets		1,441		31,991
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		₩ (187)		₩ (170)
Shuweihat Asia Operation & Maintenance Company
Disclosure of joint ventures [Line Items]
Key operation activities		Maintenance of utility plant	[1]	Maintenance of utility plant	[2]
Location		CAYMAN	[1]	CAYMAN	[2]
Percentage of ownership	[3]	55.00%	[1]	55.00%	[2]
Acquisition cost		₩ 30	[1]	₩ 30	[2]
Book value [Abstract]
Beginning balance		663	[2]	450
Acquisition		0		0
Disposal		0		0
Dividends received		(859)		(770)
Share of income (loss)		946		1,055
Other comprehensive income (loss)		42		(172)
Others (book value)		0		100
Ending balance		792	[1]	663	[2]
Share in net assets		793		663
Total assets		1,472		1,220
Total liabilities		31		14
Net assets				1,206
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		(1)		0
Sales of JointVentures		2,391		2,580
Profit (loss) for the period of JointVentures		₩ 1,719		₩ 1,918
Waterbury Lake Uranium L.P.
Disclosure of joint ventures [Line Items]
Key operation activities		Resources development		Resources development
Location		CANADA		CANADA
Percentage of ownership	[3]	34.07%		35.76%
Acquisition cost		₩ 26,602		₩ 26,602
Book value [Abstract]
Beginning balance		19,781		21,314
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(3)		(23)
Other comprehensive income (loss)		(746)		(949)
Others (book value)		0		(561)
Ending balance		19,032		19,781
Share in net assets		19,032		19,780
Total assets		55,933		55,563
Total liabilities		64		250
Net assets		55,869		55,313
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		1
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	[3]	50.00%		50.00%
Acquisition cost		₩ 16,101		₩ 16,101
Book value [Abstract]
Beginning balance		21,202		21,488
Acquisition		0		0
Disposal		0		0
Dividends received		(1,039)		(946)
Share of income (loss)		2,236		(150)
Other comprehensive income (loss)		(1,020)		810
Others (book value)		0		0
Ending balance		21,379		21,202
Share in net assets		21,379		21,202
Total assets		84,924		87,110
Total liabilities		42,166		44,706
Net assets		42,758		42,404
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		12,745		12,611
Profit (loss) for the period of JointVentures		₩ 4,406		₩ (262)
RES Technology AD
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		BULGARIA		BULGARIA
Percentage of ownership	[3]	50.00%		50.00%
Acquisition cost		₩ 15,595		₩ 15,595
Book value [Abstract]
Beginning balance		14,375		13,582
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		812		1,053
Other comprehensive income (loss)		22		(260)
Others (book value)		0		0
Ending balance		15,209		14,375
Share in net assets		15,209		14,375
Total assets		69,609		71,595
Total liabilities		39,192		42,845
Net assets		30,417		28,750
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		7,879		7,793
Profit (loss) for the period of JointVentures		₩ 1,567		₩ 2,164
KV Holdings, Inc.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		PHILIPPINES		PHILIPPINES
Percentage of ownership	[3]	40.00%		40.00%
Acquisition cost		₩ 2,103		₩ 2,103
Book value [Abstract]
Beginning balance		1,918		2,098
Acquisition		0		0
Disposal		0		0
Dividends received		(735)		0
Share of income (loss)		772		61
Other comprehensive income (loss)		(37)		(241)
Others (book value)		0		0
Ending balance		1,918		1,918
Share in net assets		1,918		1,918
Total assets		4,795		4,795
Total liabilities		0		0
Net assets		4,795		4,795
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		8		671
Profit (loss) for the period of JointVentures		₩ 1,257		₩ 677
KEPCO SPC Power Corporation
Disclosure of joint ventures [Line Items]
Key operation activities		Construction and operation of utility plant	[1]	Construction and operation of utility plant	[2]
Location		PHILIPPINES	[1]	PHILIPPINES	[2]
Percentage of ownership	[3]	75.20%	[1]	75.20%	[2]
Acquisition cost		₩ 94,579	[1]	₩ 94,579	[2]
Book value [Abstract]
Beginning balance		217,094	[2]	245,367
Acquisition		0		0
Disposal		0		0
Dividends received		(41,601)		(37,443)
Share of income (loss)		44,909		42,359
Other comprehensive income (loss)		(12,092)		(33,230)
Others (book value)		(4)		41
Ending balance		208,306	[1]	217,094	[2]
Share in net assets		208,306		217,094
Total assets		312,093		318,911
Total liabilities		35,091		30,222
Net assets		277,002		288,689
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		184,046		186,725
Profit (loss) for the period of JointVentures		₩ 59,543		₩ 57,364
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	[3]	40.00%		40.00%
Acquisition cost		₩ 16,621		₩ 16,621
Book value [Abstract]
Beginning balance		10,840		12,821
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(818)		(1,299)
Other comprehensive income (loss)		(41)		(682)
Others (book value)		0		0
Ending balance		9,981		10,840
Share in net assets		9,981		10,840
Total assets		79,354		81,960
Total liabilities		54,402		54,859
Net assets		24,952		27,101
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		8,323		6,938
Profit (loss) for the period of JointVentures		₩ (2,046)		₩ (3,253)
Datang Chifeng Renewable Power
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		CHINA		CHINA
Percentage of ownership	[3]	40.00%		40.00%
Acquisition cost		₩ 121,928		₩ 121,928
Book value [Abstract]
Beginning balance		171,055		166,535
Acquisition		0		0
Disposal		0		0
Dividends received		(18,859)		0
Share of income (loss)		14,808		14,079
Other comprehensive income (loss)		(842)		(9,559)
Others (book value)		0		0
Ending balance		166,162		171,055
Share in net assets		166,211		171,105
Total assets		751,551		762,605
Total liabilities		336,024		334,843
Net assets		415,527		427,762
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		(49)		(50)
Sales of JointVentures		117,270		113,329
Profit (loss) for the period of JointVentures		₩ 37,159		₩ 35,294
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	[3]	40.00%		40.00%
Acquisition cost		₩ 10,858		₩ 10,858
Book value [Abstract]
Beginning balance		11,060		10,843
Acquisition		0	[4]	0
Disposal		0	[4]	0
Dividends received		0	[4]	0
Share of income (loss)		582	[4]	837
Other comprehensive income (loss)		(1,214)	[4]	(620)
Others (book value)		29,014	[4]	0
Ending balance		39,442	[4]	11,060
Share in net assets		39,442		11,060
Total assets		190,951		60,913
Total liabilities		92,347		33,264
Net assets		98,604		27,649
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		18,824		8,442
Profit (loss) for the period of JointVentures		₩ 2,557		₩ 2,094
Rabigh Electricity Company
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		SAUDI ARABIA		SAUDI ARABIA
Percentage of ownership	[3]	40.00%		40.00%
Acquisition cost		₩ 109,743		₩ 109,743
Book value [Abstract]
Beginning balance		99,356		97,802
Acquisition		0		0
Disposal		0		0
Dividends received		(29,067)		(18,112)
Share of income (loss)		13,305		35,769
Other comprehensive income (loss)		22,371		(15,227)
Others (book value)		(637)		(876)
Ending balance		105,328		99,356
Share in net assets		178,256		171,248
Total assets		2,448,690		2,364,522
Total liabilities		2,003,050		1,936,403
Net assets		445,640		428,119
Investment differential		0		0
Intercompany transaction		(70,977)		(70,978)
Others (consolidated FS)		(1,951)		(914)
Sales of JointVentures		274,184		287,105
Profit (loss) for the period of JointVentures		₩ 38,789		₩ 78,948
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	[3]	40.00%		40.00%
Acquisition cost		₩ 70		₩ 70
Book value [Abstract]
Beginning balance		3,987		4,427
Acquisition		0		0
Disposal		0		0
Dividends received		(1,147)		(2,130)
Share of income (loss)		2,820		2,236
Other comprehensive income (loss)		174		(546)
Others (book value)		0		0
Ending balance		5,834		3,987
Share in net assets		5,834		3,987
Total assets		26,172		19,992
Total liabilities		11,587		10,025
Net assets		14,585		9,967
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		26,387		22,668
Profit (loss) for the period of JointVentures		₩ 7,173		₩ 5,668
Jamaica Public Service Company Limited
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		JAMAICA		JAMAICA
Percentage of ownership	[3]	40.00%		40.00%
Acquisition cost		₩ 301,910		₩ 301,910
Book value [Abstract]
Beginning balance		221,153		249,453
Acquisition		0		0
Disposal		0		0
Dividends received		(4,472)		0
Share of income (loss)		13,099		0
Other comprehensive income (loss)		9,852		(28,300)
Others (book value)		0		0
Ending balance		239,632		221,153
Share in net assets		227,434		209,464
Total assets		1,396,421		1,276,279
Total liabilities		827,837		752,617
Net assets		568,584		523,662
Investment differential		(80,161)		(80,161)
Intercompany transaction		0		0
Others (consolidated FS)		92,359		91,850
Sales of JointVentures		992,677		946,365
Profit (loss) for the period of JointVentures		₩ 32,507		₩ 24,601
KW Nuclear Components Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Manufacturing		Manufacturing
Location		KOREA		KOREA
Percentage of ownership	[3]	45.00%		45.00%
Acquisition cost		₩ 833		₩ 833
Book value [Abstract]
Beginning balance		6,703		7,133
Acquisition		0		0
Disposal		0		0
Dividends received		(208)		(208)
Share of income (loss)		1,213		(222)
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		7,708		6,703
Share in net assets		7,884		6,962
Total assets		24,598		25,693
Total liabilities		7,077		10,221
Net assets		17,521		15,472
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		(176)		(259)
Sales of JointVentures		6,031		6,486
Profit (loss) for the period of JointVentures		₩ 2,543		₩ 1,493
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	[3]	25.00%		25.00%
Acquisition cost		₩ 2,100		₩ 2,100
Book value [Abstract]
Beginning balance		4,346		3,814
Acquisition		0		0
Disposal		0		0
Dividends received		(340)		(63)
Share of income (loss)		755		595
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		4,761		4,346
Share in net assets		4,761		4,346
Total assets		45,538		47,959
Total liabilities		26,494		30,573
Net assets		19,044		17,386
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		7,901		7,984
Profit (loss) for the period of JointVentures		₩ 3,018		₩ 2,383
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	[3]	34.00%		34.00%
Acquisition cost		₩ 204,000		₩ 204,000
Book value [Abstract]
Beginning balance		220,727		205,948
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		20,061		14,714
Other comprehensive income (loss)		0		0
Others (book value)		(197)		65
Ending balance		240,591		220,727
Share in net assets		240,591		220,727
Total assets		2,259,129		2,179,465
Total liabilities		1,551,509		1,530,266
Net assets		707,620		649,199
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		787,425		351,814
Profit (loss) for the period of JointVentures		₩ 58,976		₩ 43,180
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	[3]	29.00%		29.00%
Acquisition cost		₩ 290		₩ 290
Book value [Abstract]
Beginning balance		577		477
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(62)		100
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		515		577
Share in net assets		515		577
Total assets		2,039		3,576
Total liabilities		263		1,586
Net assets		1,776		1,990
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		1,368		4,079
Profit (loss) for the period of JointVentures		₩ (134)		₩ 365
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	[3]	29.00%		29.00%
Acquisition cost		₩ 1,856		₩ 1,856
Book value [Abstract]
Beginning balance		2,463		2,343
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		213		120
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		2,676		2,463
Share in net assets		2,676		2,463
Total assets		18,443		19,143
Total liabilities		9,215		10,651
Net assets		9,228		8,492
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		2,986		3,018
Profit (loss) for the period of JointVentures		692		₩ 643
KODE NOVUS I LLC
Disclosure of joint ventures [Line Items]
Key operation activities				Power generation
Location				USA
Percentage of ownership	[3]			50.00%
Acquisition cost				₩ 19,213
Book value [Abstract]
Beginning balance		0		0
Acquisition		0	[5]	0
Disposal		0	[5]	0
Dividends received		0	[5]	0
Share of income (loss)		1,374	[5]	0
Other comprehensive income (loss)		(1,374)	[5]	0
Others (book value)		0	[5]	0
Ending balance		0	[5]	0
Share in net assets				(53,689)
Total assets				755
Total liabilities				108,132
Net assets		0		(107,377)
Investment differential				0
Intercompany transaction				0
Others (consolidated FS)				53,689
Sales of JointVentures				14
Profit (loss) for the period of JointVentures				(8,117)
Unrecognized equity interest		0		8,706
Accumulated unrecognized equity interest		0		₩ 53,689
KODE NOVUS II LLC
Disclosure of joint ventures [Line Items]
Key operation activities				Power generation
Location				USA
Percentage of ownership	[3]			50.00%
Acquisition cost				₩ 12,756
Book value [Abstract]
Beginning balance		0		0
Acquisition		0	[6]	0
Disposal		0	[6]	0
Dividends received		0	[6]	0
Share of income (loss)		810	[6]	0
Other comprehensive income (loss)		(810)	[6]	0
Others (book value)		0	[6]	0
Ending balance		0	[6]	0
Share in net assets				(23,696)
Total assets				292
Total liabilities				47,683
Net assets		0		(47,391)
Investment differential				0
Intercompany transaction				0
Others (consolidated FS)				23,696
Profit (loss) for the period of JointVentures				(6,018)
Unrecognized equity interest		0		181
Accumulated unrecognized equity interest		₩ 0		₩ 23,696
Daejung Offshore Wind Power Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership	[3]	49.90%		49.90%
Acquisition cost		₩ 5,190		₩ 5,190
Book value [Abstract]
Beginning balance		2,969		3,015
Acquisition		0		200
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(300)		(246)
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		2,669		2,969
Share in net assets		2,669		2,969
Total assets		6,440		6,193
Total liabilities		1,091		243
Net assets		5,349		5,950
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		₩ (590)		₩ (493)
Shareholders' agreements that may cause future economic resource or cash outflows		In case Samsung Heavy Industries Co., Ltd., a co-participant of the joint venture agreement, decides to dispose of its shares in Daejung Offshore Wind Power Co., Ltd., the Company is obligated to acquire those shares after evaluating the economic feasibility of the facilities installed by Samsung Heavy Industries Co., Ltd.		In case Samsung Heavy Industries Co., Ltd., a co-participant of the joint venture agreement, decides to dispose of its shares in Daejung Offshore Wind Power Co., Ltd., the Company is obligated to acquire those shares after evaluating the economic feasibility of the facilities installed by Samsung Heavy Industries Co., Ltd.
Amman Asia Electric Power Company
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation	[1]	Power generation	[2]
Location		JORDAN	[1]	JORDAN	[2]
Percentage of ownership	[3]	60.00%	[1]	60.00%	[2]
Acquisition cost		₩ 111,476	[1]	₩ 111,476	[2]
Book value [Abstract]
Beginning balance		145,676	[2]	153,857
Acquisition		0		0
Disposal		0		0
Dividends received		0		(12,213)
Share of income (loss)		19,604		19,957
Other comprehensive income (loss)		12,077		(15,925)
Others (book value)		0		0
Ending balance		177,357	[1]	145,676	[2]
Share in net assets		177,445		145,764
Total assets		792,532		759,114
Total liabilities		496,791		516,174
Net assets		295,741		242,940
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		(88)		(88)
Sales of JointVentures		23,676		18,034
Profit (loss) for the period of JointVentures		₩ 32,674		₩ 33,514
KAPES, Inc.
Disclosure of joint ventures [Line Items]
Key operation activities		R&D	[1]	R&D	[2]
Location		KOREA	[1]	KOREA	[2]
Percentage of ownership	[3]	51.00%	[1]	51.00%	[2]
Acquisition cost		₩ 5,629	[1]	₩ 5,629	[2]
Book value [Abstract]
Beginning balance		7,476	[2]	4,758
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		1,543		2,752
Other comprehensive income (loss)		0		0
Others (book value)		60		(34)
Ending balance		9,079	[1]	7,476	[2]
Share in net assets		9,079		7,476
Total assets		82,494		70,679
Total liabilities		64,691		56,021
Net assets		17,803		14,658
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		57,047		129,962
Profit (loss) for the period of JointVentures		₩ 4,710		₩ 5,397
Dangjin Eco Power Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership	[3]	34.00%		34.00%
Acquisition cost		₩ 61,540		₩ 61,540
Book value [Abstract]
Beginning balance		57,928		53,253
Acquisition		0		5,440
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(38,042)		(752)
Other comprehensive income (loss)		(65)		(3)
Others (book value)		91		(10)
Ending balance		19,912		57,928
Share in net assets		17,294		55,310
Total assets		51,125		163,197
Total liabilities		260		521
Net assets		50,865		162,676
Investment differential		2,618		2,618
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		0
Profit (loss) for the period of JointVentures		₩ (111,789)		₩ (2,182)
Honam Wind Power Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership	[3]	29.00%		29.00%
Acquisition cost		₩ 3,480		₩ 3,480
Book value [Abstract]
Beginning balance		4,302		4,451
Acquisition		0		0
Disposal		0		0
Dividends received		(348)		(487)
Share of income (loss)		906		338
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		4,860		4,302
Share in net assets		4,828		4,270
Total assets		43,713		39,675
Total liabilities		27,066		24,951
Net assets		16,647		14,724
Investment differential		32		32
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		7,700		5,961
Profit (loss) for the period of JointVentures		₩ 3,122		₩ 1,166
Chun-cheon Energy Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership	[3]	29.90%		29.90%
Acquisition cost		₩ 52,700		₩ 52,700
Book value [Abstract]
Beginning balance		48,118		50,592
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(5,613)		(2,474)
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		42,505		48,118
Share in net assets		42,502		48,115
Total assets		666,050		699,652
Total liabilities		523,904		538,733
Net assets		142,146		160,919
Investment differential		3		3
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		320,950		164,294
Profit (loss) for the period of JointVentures		₩ (19,133)		₩ (8,145)
Yeonggwangbaeksu Wind Power Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities	[7]	Power generation		Power generation
Location	[7]	KOREA		KOREA
Percentage of ownership	[3],[7]	15.00%		15.00%
Acquisition cost	[7]	₩ 3,000		₩ 3,000
Book value [Abstract]
Beginning balance		2,734	[7]	2,689
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		109		45
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance	[7]	2,843		2,734
Share in net assets		2,837		2,728
Total assets		99,368		94,810
Total liabilities		80,450		76,621
Net assets		18,918		18,189
Investment differential		6		6
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		11,366		11,124
Profit (loss) for the period of JointVentures		₩ 734		₩ 297
Nghi Son 2 Power LLC
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		VIETNAM		VIETNAM
Percentage of ownership	[3]	50.00%		50.00%
Acquisition cost		₩ 2,781		₩ 2,781
Book value [Abstract]
Beginning balance		183		229
Acquisition		0		993
Disposal		0		0
Dividends received		0		0
Share of income (loss)		2,657		(1,039)
Other comprehensive income (loss)		(2,840)		0
Others (book value)		0		0
Ending balance		0		183
Share in net assets		(41,660)		183
Total assets		477,947		741
Total liabilities		561,266		376
Net assets		(83,319)		365
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		41,660		0
Sales of JointVentures		144,381
Profit (loss) for the period of JointVentures		8,979		(2,068)
Unrecognized equity interest		41,659		0
Accumulated unrecognized equity interest		₩ 41,659		₩ 0
Kelar S.A
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation	[1]	Power generation	[2]
Location		CHILE	[1]	CHILE	[2]
Percentage of ownership	[3]	65.00%	[1]	65.00%	[2]
Acquisition cost		₩ 78,060	[1]	₩ 77,220	[2]
Book value [Abstract]
Beginning balance		67,233	[2]	0
Acquisition		0		73,040
Disposal		0		0
Dividends received		0		0
Share of income (loss)		2,732		(633)
Other comprehensive income (loss)		2,859		(5,175)
Others (book value)		0		1
Ending balance		72,824	[1]	67,233	[2]
Share in net assets		70,246		65,125
Total assets		626,206		613,293
Total liabilities		518,135		513,101
Net assets		108,071		100,192
Investment differential		2,470		2,424
Intercompany transaction		0		0
Others (consolidated FS)		108		(316)
Sales of JointVentures		87,507		90,435
Profit (loss) for the period of JointVentures		8,587		17,590
Unrecognized equity interest		0		(61,309)
Accumulated unrecognized equity interest		₩ 0		₩ 0
PT. Tanjung Power Indonesia
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		INDONESIA		INDONESIA
Percentage of ownership	[3]	35.00%		35.00%
Acquisition cost		₩ 746		₩ 746
Book value [Abstract]
Beginning balance		1,776		1,946
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		3,373		2,112
Other comprehensive income (loss)		1,928		(2,281)
Others (book value)		4		(1)
Ending balance		7,081		1,776
Share in net assets		7,081		1,776
Total assets		505,551		374,702
Total liabilities		485,321		369,627
Net assets		20,230		5,075
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		109,029		209,923
Profit (loss) for the period of JointVentures		₩ 9,717		₩ 6,219
Incheon New Power Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership	[3]	29.00%		29.00%
Acquisition cost		₩ 461		₩ 461
Book value [Abstract]
Beginning balance		619		563
Acquisition		0		0
Disposal		0		0
Dividends received		(41)		0
Share of income (loss)		1		56
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		579		619
Share in net assets		579		619
Total assets		6,559		7,194
Total liabilities		4,563		5,059
Net assets		1,996		2,135
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		2,687		2,972
Profit (loss) for the period of JointVentures		₩ 3		₩ 184
Seokmun Energy Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership	[3]	29.00%		29.00%
Acquisition cost		₩ 15,370		₩ 15,370
Book value [Abstract]
Beginning balance		13,786		391
Acquisition		0		14,790
Disposal		0		0
Dividends received		0		0
Share of income (loss)		2,965		(1,219)
Other comprehensive income (loss)		0		(176)
Others (book value)		0		0
Ending balance		16,751		13,786
Share in net assets		16,751		13,786
Total assets		253,544		247,735
Total liabilities		195,782		200,197
Net assets		57,762		47,538
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		50,052		35,135
Profit (loss) for the period of JointVentures		₩ 10,224		₩ (3,939)
Daehan Wind Power PSC
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		JORDAN		JORDAN
Percentage of ownership	[3]	50.00%		50.00%
Acquisition cost		₩ 3,191		₩ 285
Book value [Abstract]
Beginning balance		0		16
Acquisition		2,288		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(1,311)		(40)
Other comprehensive income (loss)		37		22
Others (book value)		618		2
Ending balance		1,632		0
Share in net assets		1,632		(412)
Total assets		33,081		928
Total liabilities		29,817		1,752
Net assets		3,264		(824)
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		412
Sales of JointVentures		0
Profit (loss) for the period of JointVentures		(1,799)		(904)
Unrecognized equity interest		(412)		412
Accumulated unrecognized equity interest		₩ 0		₩ 412
Barakah One Company
Disclosure of joint ventures [Line Items]
Key operation activities	[8]	Power generation		Power generation
Location	[8]	UAE		UAE
Percentage of ownership	[3],[8]	18.00%		18.00%
Acquisition cost	[8]	₩ 118		₩ 118
Book value [Abstract]
Beginning balance		626	[8]	116
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		2,162		570
Other comprehensive income (loss)		1,019		(60)
Others (book value)		0		0
Ending balance	[8]	3,807		626
Share in net assets		3,807		626
Total assets		21,480,187		17,574,885
Total liabilities		21,459,035		17,571,409
Net assets		21,152		3,476
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		0
Profit (loss) for the period of JointVentures		₩ (3,062)		₩ (1,358)
Nawah Energy Company
Disclosure of joint ventures [Line Items]
Key operation activities	[8]	Operation of utility plant		Operation of utility plant
Location	[8]	UAE		UAE
Percentage of ownership	[3],[8]	18.00%		18.00%
Acquisition cost	[8]	₩ 296		₩ 296
Book value [Abstract]
Beginning balance		258	[8]	290
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		4		(5)
Other comprehensive income (loss)		12		(27)
Others (book value)		0		0
Ending balance	[8]	274		258
Share in net assets		274		258
Total assets		70,386		1,459
Total liabilities		68,864		23
Net assets		1,522		1,436
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		₩ (11)
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	[3]	33.33%		33.33%
Acquisition cost		₩ 1		₩ 1
Book value [Abstract]
Beginning balance		391		67
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		195		321
Other comprehensive income (loss)		(4)		3
Others (book value)		0		0
Ending balance		582		391
Share in net assets		582		391
Total assets		7,476		5,028
Total liabilities		5,730		3,854
Net assets		1,746		1,174
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		16,933		11,555
Profit (loss) for the period of JointVentures		₩ 520		₩ 939
Daegu Green Power
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership	[3]	29.00%		29.00%
Acquisition cost		₩ 46,225		₩ 46,225
Book value [Abstract]
Beginning balance		42,391		47,528
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(1,283)		(5,133)
Other comprehensive income (loss)		0		0
Others (book value)		2		(4)
Ending balance		41,110		42,391
Share in net assets		19,514		20,795
Total assets		591,263		602,809
Total liabilities		523,972		531,103
Net assets		67,291		71,706
Investment differential		84		0
Intercompany transaction		0		84
Others (consolidated FS)		21,512		21,512
Sales of JointVentures		291,734		256,359
Profit (loss) for the period of JointVentures		₩ (4,424)		₩ (17,700)
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. 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	[3]	41.00%		41.00%
Acquisition cost		₩ 15,375		₩ 15,375
Book value [Abstract]
Beginning balance		15,294		0
Acquisition		0		15,375
Disposal		0		0
Dividends received		0		0
Share of income (loss)		10		(25)
Other comprehensive income (loss)		0		(56)
Others (book value)		0		0
Ending balance		15,304		15,294
Share in net assets		15,074		15,063
Total assets		255,777		212,802
Total liabilities		219,013		176,062
Net assets		36,764		36,740
Investment differential		230		231
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		0		0
Profit (loss) for the period of JointVentures		₩ (145)		₩ (62)
Chester Solar IV SpA
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation	[1]	Power generation	[2]
Location		CHILE	[1]	CHILE	[2]
Percentage of ownership	[3]	81.82%	[1]	81.82%	[2]
Acquisition cost		₩ 1,700	[1]	₩ 1,700	[2]
Book value [Abstract]
Beginning balance		1,700	[2]	0
Acquisition		0		1,700
Disposal		0		0
Dividends received		0		0
Share of income (loss)		301		0
Other comprehensive income (loss)		(150)		0
Others (book value)		0		0
Ending balance		1,851	[1]	1,700	[2]
Share in net assets		1,794		1,664
Total assets		15,307		11,660
Total liabilities		13,114		9,626
Net assets		2,193		2,034
Investment differential		57		0
Intercompany transaction		0		0
Others (consolidated FS)		0		36
Sales of JointVentures		1,415		331
Profit (loss) for the period of JointVentures		₩ 609		₩ 151
Chester Solar V SpA
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation	[1]	Power generation	[2]
Location		CHILE	[1]	CHILE	[2]
Percentage of ownership	[3]	81.82%	[1]	81.82%	[2]
Acquisition cost		₩ 525	[1]	₩ 525	[2]
Book value [Abstract]
Beginning balance		525	[2]	0
Acquisition		0		525
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(21)		0
Other comprehensive income (loss)		(30)		0
Others (book value)		0		0
Ending balance		474	[1]	525	[2]
Share in net assets		356		419
Total assets		4,759		2,081
Total liabilities		4,324		1,569
Net assets		435		512
Investment differential		118		0
Intercompany transaction		0		0
Others (consolidated FS)		0		106
Sales of JointVentures		298		0
Profit (loss) for the period of JointVentures		₩ (19)		₩ (49)
Diego de Almagro Solar SpA
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation	[1]	Power generation	[2]
Location		CHILE	[1]	CHILE	[2]
Percentage of ownership	[3]	81.82%	[1]	81.82%	[2]
Acquisition cost		₩ 2,091	[1]	₩ 2,091	[2]
Book value [Abstract]
Beginning balance		2,091	[2]	0
Acquisition		0		2,091
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(299)		0
Other comprehensive income (loss)		(129)		0
Others (book value)		0		0
Ending balance		1,663	[1]	2,091	[2]
Share in net assets		1,569		1,993
Total assets		21,317		8,266
Total liabilities		19,399		5,830
Net assets		1,918		2,436
Investment differential		94		0
Intercompany transaction		0		0
Others (consolidated FS)		0		98
Sales of JointVentures		78		0
Profit (loss) for the period of JointVentures		₩ (340)		₩ (103)
South Jamaica Power Company Limited
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		JAMAICA		JAMAICA
Percentage of ownership	[3]	20.00%		20.00%
Acquisition cost		₩ 16,231		₩ 7,090
Book value [Abstract]
Beginning balance		6,704		0
Acquisition		9,141		7,090
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(184)		0
Other comprehensive income (loss)		463		0
Others (book value)		0		(386)
Ending balance		16,124		6,704
Share in net assets		16,124		6,704
Total assets		294,341		153,958
Total liabilities		213,723		120,436
Net assets		80,618		33,522
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		₩ (932)		₩ (755)
Daesan Green Energy Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation
Location		KOREA
Percentage of ownership	[3]	35.00%
Acquisition cost		₩ 17,850
Book value [Abstract]
Acquisition		17,850
Disposal		0
Dividends received		0
Share of income (loss)		(417)
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		17,433
Share in net assets		17,433
Total assets		52,582
Total liabilities		2,774
Net assets		49,808
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		0
Sales of JointVentures		0
Profit (loss) for the period of JointVentures		₩ (1,192)
RE Holiday Holdings LLC
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation
Location		USA
Percentage of ownership	[3]	50.00%
Acquisition cost		₩ 42,948
Book value [Abstract]
Acquisition		42,948
Disposal		0
Dividends received		(112)
Share of income (loss)		8,055
Other comprehensive income (loss)		203
Others (book value)		0
Ending balance		51,094
Share in net assets		51,094
Total assets		334,742
Total liabilities		232,553
Net assets		102,189
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		0
Sales of JointVentures		9,451
Profit (loss) for the period of JointVentures		₩ 1,319
RE Pioneer Holdings LLC
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation
Location		USA
Percentage of ownership	[3]	50.00%
Acquisition cost		₩ 27,891
Book value [Abstract]
Acquisition		27,891
Disposal		0
Dividends received		(979)
Share of income (loss)		11,585
Other comprehensive income (loss)		401
Others (book value)		0
Ending balance		38,898
Share in net assets		38,898
Total assets		252,512
Total liabilities		174,717
Net assets		77,795
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		0
Sales of JointVentures		12,364
Profit (loss) for the period of JointVentures		₩ 6,544
RE Barren Ridge 1 Holdings LLC
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation
Location		USA
Percentage of ownership	[3]	50.00%
Acquisition cost		₩ 28,021
Book value [Abstract]
Acquisition		28,021
Disposal		0
Dividends received		(1,114)
Share of income (loss)		13,994
Other comprehensive income (loss)		514
Others (book value)		0
Ending balance		41,415
Share in net assets		41,415
Total assets		221,304
Total liabilities		138,473
Net assets		82,831
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		0
Sales of JointVentures		10,567
Profit (loss) for the period of JointVentures		₩ 8,625
RE Astoria 2 LandCo LLC
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation
Location		USA
Percentage of ownership	[3]	50.00%
Acquisition cost		₩ 5,188
Book value [Abstract]
Acquisition		5,188
Disposal		0
Dividends received		(504)
Share of income (loss)		866
Other comprehensive income (loss)		(140)
Others (book value)		0
Ending balance		5,410
Share in net assets		5,410
Total assets		11,030
Total liabilities		210
Net assets		10,820
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		0
Sales of JointVentures		619
Profit (loss) for the period of JointVentures		₩ 583
RE Barren Ridge LandCo LLC
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation
Location		USA
Percentage of ownership	[3]	50.00%
Acquisition cost		₩ 2,187
Book value [Abstract]
Acquisition		2,187
Disposal		0
Dividends received		(202)
Share of income (loss)		(25)
Other comprehensive income (loss)		(62)
Others (book value)		0
Ending balance		1,898
Share in net assets		1,898
Total assets		3,881
Total liabilities		84
Net assets		3,797
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		0
Sales of JointVentures		248
Profit (loss) for the period of JointVentures		₩ 230
Laurel SpA
Disclosure of joint ventures [Line Items]
Key operation activities	[1]	Power generation
Location	[1]	CHILE
Percentage of ownership	[1],[3]	81.82%
Acquisition cost	[1]	₩ 1,222
Book value [Abstract]
Acquisition		1,222
Disposal		0
Dividends received		0
Share of income (loss)		(309)
Other comprehensive income (loss)		8
Others (book value)		0
Ending balance	[1]	921
Share in net assets		739
Total assets		5,475
Total liabilities		4,572
Net assets		903
Investment differential		182
Intercompany transaction		0
Others (consolidated FS)		0
Sales of JointVentures		0
Profit (loss) for the period of JointVentures		₩ (369)
KIAMCO KOWEPO Bannerton Hold Co Pty Ltd
Disclosure of joint ventures [Line Items]
Key operation activities	[7]	Power generation
Location	[7]	AUSTRALIA
Percentage of ownership	[3],[7]	12.37%
Acquisition cost	[7]	₩ 4,095
Book value [Abstract]
Acquisition		4,095
Disposal		0
Dividends received		0
Share of income (loss)		(23)
Other comprehensive income (loss)		(132)
Others (book value)		0
Ending balance	[7]	3,940
Share in net assets		3,931
Total assets		31,958
Total liabilities		173
Net assets		31,785
Investment differential		9
Intercompany transaction		0
Others (consolidated FS)		0
Sales of JointVentures		0
Profit (loss) for the period of JointVentures		₩ (222)
Chile Solar JV SpA
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation
Location		CHILE
Percentage of ownership	[3]	50.00%
Acquisition cost		₩ 36,654
Book value [Abstract]
Acquisition		36,654
Disposal		0
Dividends received		0
Share of income (loss)		4,453
Other comprehensive income (loss)		(5,278)
Others (book value)		1,036
Ending balance		36,865
Share in net assets		36,865
Total assets		73,740
Total liabilities		10
Net assets		73,730
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		0
Sales of JointVentures		73
Profit (loss) for the period of JointVentures		₩ 8,906
Taebaek Gadeoksan Wind Power Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation
Location		KOREA
Percentage of ownership	[3]	46.58%
Acquisition cost		₩ 8,500
Book value [Abstract]
Acquisition		8,500
Disposal		0
Dividends received		0
Share of income (loss)		8
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		8,508
Share in net assets		8,508
Total assets		18,766
Total liabilities		499
Net assets		18,267
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		0
Sales of JointVentures		0
Profit (loss) for the period of JointVentures		₩ 18
Cheong-Song Noraesan Wind Power Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation
Location		KOREA
Percentage of ownership	[3]	24.76%
Acquisition cost		₩ 2,073
Book value [Abstract]
Acquisition		2,073
Disposal		0
Dividends received		0
Share of income (loss)		0
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		2,073
Share in net assets		2,029
Total assets		8,221
Total liabilities		24
Net assets		8,197
Investment differential		44
Intercompany transaction		0
Others (consolidated FS)		0
Sales of JointVentures		0
Profit (loss) for the period of JointVentures		₩ 0
Chester Solar I SpA
Disclosure of joint ventures [Line Items]
Key operation activities	[1]	Power generation
Location	[1]	CHILE
Percentage of ownership	[1],[3]	81.82%
Acquisition cost	[1]	₩ 1,181
Book value [Abstract]
Acquisition		1,181
Disposal		0
Dividends received		0
Share of income (loss)		0
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance	[1]	1,181
Share in net assets		940
Total assets		1,712
Total liabilities		562
Net assets		1,150
Investment differential		241
Intercompany transaction		0
Others (consolidated FS)		0
Sales of JointVentures		0
Profit (loss) for the period of JointVentures		₩ (81)
Solar Philippines Calatagan Corporation
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation
Location		PHILIPPINES
Percentage of ownership	[3]	38.00%
Acquisition cost		₩ 47,903
Book value [Abstract]
Acquisition		47,903
Disposal		0
Dividends received		0
Share of income (loss)		0
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		47,903
Share in net assets		26,764
Total assets		121,650
Total liabilities		51,219
Net assets		70,431
Investment differential		21,139
Intercompany transaction		0
Others (consolidated FS)		0
Sales of JointVentures		16,689
Profit (loss) for the period of JointVentures		₩ 8,732
[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 effective percentage of ownership is more than 100%. However, according to the shareholders' agreement, all critical financial and operating decisions must be agreed to by all ownership parties. For these reasons, the entities are classified as joint ventures.
[3]	The percentage of ownership shown above is after considering the treasury stocks and others.
[4]	Datang Chaoyang Renewable Power Co., Ltd. was merged with Datang KEPCO Chaoyang Renewable Power Co., Ltd. during the year ended December 31, 2018.
[5]	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.
[6]	The Company sold all of its shares of KODE NOVUS II LLC during the year ended December 31, 2018.
[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]	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

Property, Plant and Equipment_2

Property, Plant and Equipment (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2018		Dec. 31, 2017
Changes in property and equipment [Line Items]
Beginning balance		₩ 150,882,414		₩ 145,743,056
Acquisitions		12,266,870		12,535,958
Disposals		(909,211)		(824,993)
Depreciation		(9,904,933)		(9,658,863)
Impairment		(710,162)	[1]	(51,067)	[2]
Others		1,118,218		3,138,321
Ending balance		152,743,194		150,882,414
Land
Changes in property and equipment [Line Items]
Beginning balance		13,296,574		12,966,537
Ending balance		13,532,324		13,296,574
Land | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance		13,318,542		12,969,741
Acquisitions		2,254		32,773
Disposals		(18,240)		(8,961)
Depreciation		0		0
Impairment		0	[1]	0	[2]
Others		251,736		324,989
Ending balance		13,554,292		13,318,542
Land | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance		13,318,542		12,969,741
Ending balance		13,554,292		13,318,542
Land | Government grants
Changes in property and equipment [Line Items]
Beginning balance		(21,968)		(3,204)
Acquisitions		0		0
Disposals		0		5
Depreciation		0		0
Impairment		0	[1]	0	[2]
Others		0		(18,769)
Ending balance		(21,968)		(21,968)
Buildings
Changes in property and equipment [Line Items]
Beginning balance		11,989,987		11,723,436
Ending balance		11,870,502		11,989,987
Buildings | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance		12,053,526		11,784,624
Acquisitions		10,156		40,592
Disposals		(8,545)		(19,715)
Depreciation		(767,845)		(794,804)
Impairment		(1,896)	[1]	(923)	[2]
Others		648,295		1,043,752
Ending balance		11,933,691		12,053,526
Buildings | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance		18,777,678		17,722,326
Ending balance		19,431,536		18,777,678
Buildings | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance		(6,722,376)		(5,936,849)
Ending balance		(7,494,176)		(6,722,376)
Buildings | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance		(1,776)		(853)
Ending balance		(3,669)		(1,776)
Buildings | Government grants
Changes in property and equipment [Line Items]
Beginning balance		(63,539)		(61,188)
Acquisitions		(4,213)		(900)
Disposals		31		28
Depreciation		6,836		5,996
Impairment	[1]	0
Others		(2,304)		(7,475)
Ending balance		(63,189)		(63,539)
Structures
Changes in property and equipment [Line Items]
Beginning balance		43,908,364		43,132,774
Ending balance		42,520,941		43,908,364
Structures | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance		44,104,778		43,330,415
Acquisitions		11,123		428
Disposals		(587,278)		(519,366)
Depreciation		(2,476,278)		(2,421,168)
Impairment		(360)	[1]	(6,856)	[2]
Others		1,659,810		3,721,325
Ending balance		42,711,795		44,104,778
Structures | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance		66,184,484		63,291,437
Ending balance		66,335,506		66,184,484
Structures | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance		(22,071,667)		(19,959,839)
Ending balance		(23,615,312)		(22,071,667)
Structures | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance		(8,039)		(1,183)
Ending balance		(8,339)		(8,039)
Structures | Government grants
Changes in property and equipment [Line Items]
Beginning balance		(196,414)		(197,641)
Acquisitions		0		0
Disposals		3,270		1,905
Depreciation		10,292		10,011
Impairment		0	[1]	0	[2]
Others		(8,002)		(10,689)
Ending balance		(190,854)		(196,414)
Machinery
Changes in property and equipment [Line Items]
Beginning balance		46,692,610		43,310,881
Ending balance		47,283,353		46,692,610
Machinery | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance		46,875,798		43,421,945
Acquisitions		460,676	[3]	421,892
Disposals		(250,159)	[3]	(242,428)
Depreciation		(4,973,252)	[3]	(4,821,595)
Impairment		(393,839)	[1],[3]	(43,121)	[2]
Others		5,737,371	[3]	8,139,105
Ending balance		47,456,595	[3]	46,875,798
Machinery | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance		75,826,292		67,769,168
Ending balance		82,047,823		75,826,292
Machinery | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance		(28,904,982)		(24,344,832)
Ending balance		(34,151,878)		(28,904,982)
Machinery | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance		(45,512)		(2,391)
Ending balance		(439,350)		(45,512)
Machinery | Government grants
Changes in property and equipment [Line Items]
Beginning balance		(183,188)		(111,064)
Acquisitions		(1,185)		(10,834)
Disposals		823		489
Depreciation		18,099		17,390
Impairment		0	[1]	0	[2]
Others		(7,791)		(79,169)
Ending balance		(173,242)		(183,188)
Ships
Changes in property and equipment [Line Items]
Beginning balance		403		550
Ending balance		302		403
Ships | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance		403		550
Acquisitions		0		0
Disposals		0		0
Depreciation		(103)		(147)
Impairment		0	[1]	0	[2]
Others		2		0
Ending balance		302		403
Ships | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance		4,175		4,175
Ending balance		3,655		4,175
Ships | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance		(3,772)		(3,625)
Ending balance		(3,353)		(3,772)
Vehicles
Changes in property and equipment [Line Items]
Beginning balance		74,716		70,863
Ending balance		67,969		74,716
Vehicles | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance		81,038		70,970
Acquisitions		2,774		3,447
Disposals		(402)		(174)
Depreciation		(32,620)		(34,236)
Impairment		0	[1]	(127)	[2]
Others		21,399		41,158
Ending balance		72,189		81,038
Vehicles | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance		276,425		247,751
Ending balance		287,954		276,425
Vehicles | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance		(195,260)		(176,781)
Ending balance		(215,649)		(195,260)
Vehicles | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance		(127)
Ending balance		(116)		(127)
Vehicles | Government grants
Changes in property and equipment [Line Items]
Beginning balance		(6,322)		(107)
Acquisitions		(45)		(107)
Disposals		0		14
Depreciation		2,146		1,070
Impairment		0	[1]	0	[2]
Others		1		(7,192)
Ending balance		(4,220)		(6,322)
Equipment
Changes in property and equipment [Line Items]
Beginning balance		419,911		375,663
Ending balance		382,441		419,911
Equipment | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance		420,672		376,395
Acquisitions		36,884		53,529
Disposals		(265)		(413)
Depreciation		(187,821)		(158,614)
Impairment		(36)	[1]	(6)	[2]
Others		113,425		149,781
Ending balance		382,859		420,672
Equipment | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance		1,440,870		1,270,660
Ending balance		1,558,309		1,440,870
Equipment | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance		(1,020,192)		(894,265)
Ending balance		(1,175,408)		(1,020,192)
Equipment | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance		(6)
Ending balance		(42)		(6)
Equipment | Government grants
Changes in property and equipment [Line Items]
Beginning balance		(761)		(732)
Acquisitions		(22)		(43)
Disposals		0		0
Depreciation		365		454
Impairment		0	[1]	0	[2]
Others		0		(440)
Ending balance		(418)		(761)
Tools
Changes in property and equipment [Line Items]
Beginning balance		199,636		178,602
Ending balance		192,000		199,636
Tools | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance		200,663		179,032
Acquisitions		12,331		30,990
Disposals		(268)		(166)
Depreciation		(83,283)		(74,909)
Impairment		(6)	[1]	(32)	[2]
Others		63,238		0
Ending balance		192,675		200,663
Tools | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance		1,010,537		921,115
Ending balance		1,073,145		1,010,537
Tools | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance		(809,842)		(742,083)
Ending balance		(880,432)		(809,842)
Tools | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance		(32)
Ending balance		(38)		(32)
Tools | Government grants
Changes in property and equipment [Line Items]
Beginning balance		(1,027)		(430)
Acquisitions		(44)		0
Disposals		0		0
Depreciation		432		354
Impairment		0	[1]	0	[2]
Others		(36)		(951)
Ending balance		(675)		(1,027)
Construction in progress
Changes in property and equipment [Line Items]
Beginning balance		25,523,457		27,160,453
Ending balance		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		25,572,541		27,296,260
Acquisitions		11,749,397		11,996,508
Disposals		(47,463)		(6,487)
Depreciation		0		0
Impairment		(167,603)	[1]	0	[2]
Others		(8,285,705)		(13,713,740)
Ending balance		28,821,167		25,572,541
Construction in progress | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance		25,610,649		27,334,368
Ending balance		29,026,880		25,610,649
Construction in progress | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance		(38,108)		(38,108)
Ending balance		(205,713)		(38,108)
Construction in progress | Government grants
Changes in property and equipment [Line Items]
Beginning balance		(49,084)		(135,807)
Acquisitions		(23,895)		(42,728)
Disposals		0		0
Depreciation		0		0
Impairment		0	[1]	0	[2]
Others		18,239		129,451
Ending balance		(54,740)		(49,084)
Finance lease assets
Changes in property and equipment [Line Items]
Beginning balance		297,652		406,353
Ending balance		195,704		297,652
Finance lease assets | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance		297,679		406,353
Acquisitions		0		0
Disposals		0		(29,696)
Depreciation		(101,888)		(107,390)
Impairment		0	[1]	0	[2]
Others		(61)		28,412
Ending balance		195,730		297,679
Finance lease assets | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance		2,390,680		2,390,779
Ending balance		2,390,701		2,390,680
Finance lease assets | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance		(2,093,001)		(1,984,426)
Ending balance		(2,194,971)		(2,093,001)
Finance lease assets | Government grants
Changes in property and equipment [Line Items]
Beginning balance		(27)
Acquisitions		0		0
Disposals		0		0
Depreciation		1		1
Impairment		0	[1]	0	[2]
Others		0		(28)
Ending balance		(26)		(27)
Retirements, property, plant and equipment
Changes in property and equipment [Line Items]
Beginning balance		6,039,484		4,065,412
Ending balance		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		6,039,484		4,065,412
Acquisitions		1,988
Disposals		0
Depreciation		(610,435)		(518,565)
Impairment	[1]	(146,424)
Others		287,141		2,492,637
Ending balance		5,571,754		6,039,484
Retirements, property, plant and equipment | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance		9,395,821		7,129,771
Ending balance		9,424,181		9,395,821
Retirements, property, plant and equipment | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance		(3,356,337)		(3,064,359)
Ending balance		(3,706,004)		(3,356,337)
Other property, plant and equipment
Changes in property and equipment [Line Items]
Beginning balance		2,439,620		2,351,532
Ending balance		2,359,477		2,439,620
Other property, plant and equipment | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance		2,439,620		2,351,532
Acquisitions		8,691		10,411
Disposals		(715)		(28)
Depreciation		(709,579)		(762,711)
Impairment		0	[1]	0	[2]
Others		621,460		840,416
Ending balance		2,359,477		2,439,620
Other property, plant and equipment | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance		11,247,021		10,361,294
Ending balance		11,875,394		11,247,021
Other property, plant and equipment | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance		(8,807,401)		(8,009,762)
Ending balance		₩ (9,515,917)		₩ (8,807,401)
[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 impairment loss in the consolidated statements of comprehensive income. The amount includes impairment loss of KRW703,133 million in relation to Wolsong unit 1, and Shin-Hanul unit 3 and 4 as described in note 2, and the loss of KRW7,031 million due to fire at Taean unit 2.
[2]	Korea Midland 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 impairment loss in the consolidated statements of comprehensive income.
[3]	As described in note 29, the amount of acquisition of machinery includes KRW204,787 million of that the Company believes the possibility of economic 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, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about investment property [Line Items]
Beginning balance	₩ 284,714	₩ 353,680
Depreciation	(923)	(1,176)	₩ (678)
Others	(124,232)	(67,790)
Endings balance	159,559	284,714	353,680
Carrying Amount Other than Government Grants
Disclosure of detailed information about investment property [Line Items]
Beginning balance	284,797	353,744
Depreciation	(924)	(1,178)
Others	(124,264)	(67,769)
Endings balance	159,609	284,797	353,744
Acquisition cost
Disclosure of detailed information about investment property [Line Items]
Beginning balance	300,370
Endings balance	174,741	300,370
Accumulated depreciation
Disclosure of detailed information about investment property [Line Items]
Beginning balance	(15,573)
Endings balance	(15,132)	(15,573)
Government grants
Disclosure of detailed information about investment property [Line Items]
Beginning balance	(83)	(64)
Depreciation	1	2
Others	32	(21)
Endings balance	(50)	(83)	(64)
Investment property - Land
Disclosure of detailed information about investment property [Line Items]
Beginning balance	264,205	336,421
Depreciation	0	0
Others	(124,265)	(72,216)
Endings balance	139,940	264,205	336,421
Investment property - Land | Carrying Amount Other than Government Grants
Disclosure of detailed information about investment property [Line Items]
Beginning balance	264,205	336,421
Others	(124,265)	(72,216)
Endings balance	139,940	264,205	336,421
Investment property - Land | Acquisition cost
Disclosure of detailed information about investment property [Line Items]
Beginning balance	264,205
Endings balance	139,940	264,205
Investment property - Buildings
Disclosure of detailed information about investment property [Line Items]
Beginning balance	20,509	17,259
Depreciation	(923)	(1,176)
Others	33	4,426
Endings balance	19,619	20,509	17,259
Investment property - Buildings | Carrying Amount Other than Government Grants
Disclosure of detailed information about investment property [Line Items]
Beginning balance	20,592	17,323
Depreciation	(924)	(1,178)
Others	1	4,447
Endings balance	19,669	20,592	17,323
Investment property - Buildings | Acquisition cost
Disclosure of detailed information about investment property [Line Items]
Beginning balance	36,165
Endings balance	34,801	36,165
Investment property - Buildings | Accumulated depreciation
Disclosure of detailed information about investment property [Line Items]
Beginning balance	(15,573)
Endings balance	(15,132)	(15,573)
Investment property - Buildings | Government grants
Disclosure of detailed information about investment property [Line Items]
Beginning balance	(83)	(64)
Depreciation	1	2
Others	32	(21)
Endings balance	₩ (50)	₩ (83)	₩ (64)

Income and expenses on investme

Income and expenses on investment property (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income and expenses on investment property [Abstract]
Rental income	₩ 9,494	₩ 9,581
Operating and maintenance expenses related to rental income	(923)	(1,172)
Rental income from investment property, net of direct operating expense	₩ 8,571	₩ 8,409

The fair value of investment pr

The fair value of investment property (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure - The fair value of investment property [Line Items]
Fair value of Investment property	₩ 190,454	₩ 332,560
Carrying amount of Investment property	159,559	284,714	₩ 353,680
Land
Disclosure - The fair value of investment property [Line Items]
Fair value of Investment property	167,178	309,241
Carrying amount of Investment property	139,940	264,205	336,421
Buildings
Disclosure - The fair value of investment property [Line Items]
Fair value of Investment property	23,276	23,319
Carrying amount of Investment property	₩ 19,619	₩ 20,509	₩ 17,259

Construction Services Contrac_3

Construction Services Contracts (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Construction Services Contracts [Abstract]
Beginning balance	₩ 4,176,595		₩ 7,236,888		₩ 12,308,839
Increase and decrease
New orders and other	(1,207,097)		(438,142)		(718,118)
Changes in scope of construction work	20,513		286,251		1,763,212
Increase (decrease) in Construction contracts	1,186,584	[1]	151,891	[2]	(1,045,094)	[3]
Recognized as revenue	(1,742,391)		(3,212,184)		(4,026,857)
Ending balance	₩ 3,620,788		₩ 4,176,595		₩ 7,236,888
[1]	For the year ended December 31, 2018, the increased balance of contracts from new orders and foreign exchange impact is KRW1,207,097 million and the decreased balance of contracts due to changes in scope of construction work is KRW20,513 million.
[2]	For the year ended December 31, 2017, the increased balance of contracts from new orders and other is KRW438,142 million and the decreased balance of contracts due to changes in scope of construction work is KRW286,251 million.
[3]	For the year ended December 31, 2016, the increased balance of contracts from new orders and other is KRW718,118 million and the decreased balance of contracts due to changes in scope of construction work is KRW1,763,212 million.

Construction Services Contrac_4

Construction Services Contracts, Continued (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2018	Dec. 31, 2017
Accumulated earned revenue, expense and others
Accumulated earned revenue		₩ 19,801,220	₩ 18,236,992
Accumulated expense		18,651,188	16,937,772
Accumulated profit		1,150,032	1,299,220
Unearned advance receipts		0	0
Contract with Customer, Asset and Liability
Assets	[1]	36,232	55,755
Liabilities	[2]	₩ 350,460	₩ 542,921
[1]	Included in trade and other receivables, net, in the consolidated statements of financial position.
[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, 2018		Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	₩ 1,225,942		₩ 1,187,121
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	1,187,121
Changes in intangible assets other than goodwill
Impairment loss	8,112	[1]	20	₩ 3,945
Ending balance	1,225,942		1,187,121
Intangible assets other than goodwill
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	1,225,942		1,187,121	980,821
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	1,187,121		980,821
Changes in intangible assets other than goodwill
Acquisition	110,587		143,887
Disposal	(9)		(661)
Amortization	(118,938)		(113,672)
Impairment loss	(8,140)	[1]	34
Others	55,321		176,712
Ending balance	1,225,942		1,187,121	980,821
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	997,679
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	1,201,860		997,679
Changes in intangible assets other than goodwill
Acquisition	110,587		143,904
Disposal	(9)		(661)
Amortization	(120,794)		(116,748)
Impairment loss	(8,939)	[1]	34
Others	56,331		177,652
Ending balance	1,239,036		1,201,860	997,679
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	2,581,539
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	2,897,446		2,581,539
Changes in intangible assets other than goodwill
Ending balance	3,069,716		2,897,446	2,581,539
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)	(1,567,795)
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(1,679,576)		(1,567,795)
Changes in intangible assets other than goodwill
Ending balance	(1,805,784)		(1,679,576)	(1,567,795)
Intangible assets other than goodwill | Accumulated impairment [Member]
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	(24,896)		(16,010)	(16,065)
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(16,010)		(16,065)
Changes in intangible assets other than goodwill
Ending balance	(24,896)		(16,010)	(16,065)
Intangible assets other than goodwill | Government grants
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	(13,094)		(14,739)	(16,858)
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(14,739)		(16,858)
Changes in intangible assets other than goodwill
Acquisition	0		(17)
Disposal	0		0
Amortization	1,856		3,076
Impairment loss	799	[1]	0
Others	(1,010)		(940)
Ending balance	(13,094)		(14,739)	(16,858)
Software
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	157,261		125,405	92,626
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	125,405		92,626
Changes in intangible assets other than goodwill
Acquisition	10,861		12,683
Disposal	(1)		(5)
Amortization	(53,501)		(44,554)
Impairment loss	0	[1]	0
Others	74,497		64,655
Ending balance	157,261		125,405	92,626
Software | Carrying Amount Other than Government Grants
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	157,681		125,891	93,221
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	125,891		93,221
Changes in intangible assets other than goodwill
Acquisition	10,861		12,700
Disposal	(1)		(5)
Amortization	(53,755)		(44,809)
Impairment loss	0	[1]	0
Others	74,685		64,784
Ending balance	157,681		125,891	93,221
Software | Acquisition cost
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	619,662		534,191	458,382
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	534,191		458,382
Changes in intangible assets other than goodwill
Ending balance	619,662		534,191	458,382
Software | Accumulated amortization
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	(461,981)		(408,300)	(365,161)
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(408,300)		(365,161)
Changes in intangible assets other than goodwill
Ending balance	(461,981)		(408,300)	(365,161)
Software | Government grants
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	(420)		(486)	(595)
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(486)		(595)
Changes in intangible assets other than goodwill
Acquisition	0		(17)
Disposal	0		0
Amortization	254		255
Impairment loss	0	[1]	0
Others	(188)		(129)
Ending balance	(420)		(486)	(595)
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	20,081
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	23,981		20,081
Changes in intangible assets other than goodwill
Acquisition	28		30
Disposal	0		(7)
Amortization	(8,665)		(3,350)
Impairment loss	(13)	[1]	0
Others	51,781		7,227
Ending balance	67,112		23,981	20,081
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	20,081
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	23,981		20,081
Changes in intangible assets other than goodwill
Acquisition	28		30
Disposal	0		(7)
Amortization	(8,665)		(3,350)
Impairment loss	(13)	[1]	0
Others	51,781		7,227
Ending balance	67,112		23,981	20,081
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	35,756
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	43,857		35,756
Changes in intangible assets other than goodwill
Ending balance	97,033		43,857	35,756
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)	(15,675)
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(19,876)		(15,675)
Changes in intangible assets other than goodwill
Ending balance	(29,921)		(19,876)	(15,675)
Mining rights
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	534,524		539,633	538,860
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	539,633		538,860
Changes in intangible assets other than goodwill
Acquisition	29,687		26,751
Disposal	0		(272)
Amortization	(3,186)		(4,640)
Impairment loss	0	[1]	0
Others	(31,610)		(21,066)
Ending balance	534,524		539,633	538,860
Mining rights | Carrying Amount Other than Government Grants
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	534,524		539,633	538,860
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	539,633		538,860
Changes in intangible assets other than goodwill
Acquisition	29,687		26,751
Disposal	0		(272)
Amortization	(3,186)		(4,640)
Impairment loss	0	[1]	0
Others	(31,610)		(21,066)
Ending balance	534,524		539,633	538,860
Mining rights | Acquisition cost
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	561,945		553,876	549,371
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	553,876		549,371
Changes in intangible assets other than goodwill
Ending balance	561,945		553,876	549,371
Mining rights | Accumulated amortization
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	(27,421)		(14,243)	(10,511)
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(14,243)		(10,511)
Changes in intangible assets other than goodwill
Ending balance	(27,421)		(14,243)	(10,511)
Development expenditures
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	90,376		80,816	57,253
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	80,816		57,253
Changes in intangible assets other than goodwill
Acquisition	823		494
Disposal	0		0
Amortization	(25,509)		(23,113)
Impairment loss	0	[1]	0
Others	34,246		46,182
Ending balance	90,376		80,816	57,253
Development expenditures | Carrying Amount Other than Government Grants
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	92,486		84,518	62,405
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	84,518		62,405
Changes in intangible assets other than goodwill
Acquisition	823		494
Disposal	0		0
Amortization	(27,100)		(25,924)
Impairment loss	0	[1]	0
Others	34,245		47,543
Ending balance	92,486		84,518	62,405
Development expenditures | Acquisition cost
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	878,462		836,996	785,966
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	836,996		785,966
Changes in intangible assets other than goodwill
Ending balance	878,462		836,996	785,966
Development expenditures | Accumulated amortization
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	(785,976)		(752,478)	(723,561)
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(752,478)		(723,561)
Changes in intangible assets other than goodwill
Ending balance	(785,976)		(752,478)	(723,561)
Development expenditures | Government grants
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	(2,110)		(3,702)	(5,152)
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(3,702)		(5,152)
Changes in intangible assets other than goodwill
Acquisition	0		0
Disposal	0		0
Amortization	1,591		2,811
Impairment loss	0	[1]	0
Others	1		(1,361)
Ending balance	(2,110)		(3,702)	(5,152)
Intangible assets under development
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	59,972		129,370	104,443
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	129,370		104,443
Changes in intangible assets other than goodwill
Acquisition	67,383		56,527
Disposal	0		0
Amortization	0		0
Impairment loss	(8,113)	[1]	(20)
Others	(128,668)		(31,580)
Ending balance	59,972		129,370	104,443
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	115,533
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	139,910		115,533
Changes in intangible assets other than goodwill
Acquisition	67,383		56,527
Disposal	0		0
Amortization	0		0
Impairment loss	(8,912)	[1]	(20)
Others	(127,845)		(32,130)
Ending balance	70,536		139,910	115,533
Intangible assets under development | Acquisition cost
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	83,381		143,851	119,474
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	143,851		119,474
Changes in intangible assets other than goodwill
Ending balance	83,381		143,851	119,474
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	(3,941)		(3,941)
Changes in intangible assets other than goodwill
Ending balance	(12,845)		(3,941)	(3,941)
Intangible assets under development | Government grants
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	(10,564)		(10,540)	(11,090)
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(10,540)		(11,090)
Changes in intangible assets other than goodwill
Acquisition	0		0
Disposal	0		0
Amortization	0		0
Impairment loss	799	[1]	0
Others	(823)		550
Ending balance	(10,564)		(10,540)	(11,090)
Usage rights of donated assets and other
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	87,011		101,647	84,081
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	101,647		84,081
Changes in intangible assets other than goodwill
Acquisition	0		0
Disposal	0		0
Amortization	(13,296)		(14,452)
Impairment loss	0	[1]	0
Others	(1,340)		32,018
Ending balance	87,011		101,647	84,081
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	84,102
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	101,658		84,102
Changes in intangible assets other than goodwill
Acquisition	0		0
Disposal	0		0
Amortization	(13,307)		(14,462)
Impairment loss	0	[1]	0
Others	(1,340)		32,018
Ending balance	87,011		101,658	84,102
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	426,346
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	459,682		426,346
Changes in intangible assets other than goodwill
Ending balance	459,682		459,682	426,346
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)	(342,244)
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(358,024)		(342,244)
Changes in intangible assets other than goodwill
Ending balance	(372,671)		(358,024)	(342,244)
Usage rights of donated assets and other | Government grants
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	0		(11)	(21)
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(11)		(21)
Changes in intangible assets other than goodwill
Acquisition	0		0
Disposal	0		0
Amortization	11		10
Impairment loss	0	[1]	0
Others	0		0
Ending balance	0		(11)	(21)
Leasehold rights
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	5,552		5,044	4,632
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	5,044		4,632
Changes in intangible assets other than goodwill
Acquisition	0		0
Disposal	0		0
Amortization	(667)		(545)
Impairment loss	0	[1]	0
Others	1,175		957
Ending balance	5,552		5,044	4,632
Leasehold rights | Carrying Amount Other than Government Grants
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	5,552		5,044	4,632
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	5,044		4,632
Changes in intangible assets other than goodwill
Acquisition	0		0
Disposal	0		0
Amortization	(667)		(545)
Impairment loss	0	[1]	0
Others	1,175		957
Ending balance	5,552		5,044	4,632
Leasehold rights | Acquisition cost
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	25,482		24,306	23,350
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	24,306		23,350
Changes in intangible assets other than goodwill
Ending balance	25,482		24,306	23,350
Leasehold rights | Accumulated amortization
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	(19,930)		(19,262)	(18,718)
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(19,262)		(18,718)
Changes in intangible assets other than goodwill
Ending balance	(19,930)		(19,262)	(18,718)
Greenhouse gas emissions rights
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	7,050		0	6,283
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	0		6,283
Changes in intangible assets other than goodwill
Acquisition	0		0
Disposal	0		0
Amortization	0		0
Impairment loss	0	[1]	0
Others	7,050		(6,283)
Ending balance	7,050		0	6,283
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	6,283
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	0		6,283
Changes in intangible assets other than goodwill
Acquisition	0		0
Disposal	0		0
Amortization	0		0
Impairment loss	0	[1]	0
Others	7,050		(6,283)
Ending balance	7,050		0	6,283
Greenhouse gas emissions rights | Acquisition cost
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	7,050		0	6,283
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	0		6,283
Changes in intangible assets other than goodwill
Ending balance	7,050		0	6,283
Others
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	217,084		181,225	72,562
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	181,225		72,562
Changes in intangible assets other than goodwill
Acquisition	1,805		47,402
Disposal	(8)		(377)
Amortization	(14,114)		(23,018)
Impairment loss	(14)	[1]	54
Others	48,190		84,602
Ending balance	217,084		181,225	72,562
Others | Carrying Amount Other than Government Grants
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	217,084		181,225	72,562
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	181,225		72,562
Changes in intangible assets other than goodwill
Acquisition	1,805		47,402
Disposal	(8)		(377)
Amortization	(14,114)		(23,018)
Impairment loss	(14)	[1]	54
Others	48,190		84,602
Ending balance	217,084		181,225	72,562
Others | Acquisition cost
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	333,621		297,289	173,213
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	297,289		173,213
Changes in intangible assets other than goodwill
Ending balance	333,621		297,289	173,213
Others | Accumulated amortization
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	(104,486)		(103,995)	(88,527)
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(103,995)		(88,527)
Changes in intangible assets other than goodwill
Ending balance	(104,486)		(103,995)	(88,527)
Others | Accumulated impairment [Member]
Disclosure of detailed information about intangible assets [Line Items]
Net carrying value	(12,051)		(12,069)	(12,124)
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(12,069)		(12,124)
Changes in intangible assets other than goodwill
Ending balance	(12,051)		(12,069)	(12,124)
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	0		0
Impairment loss	0	[1]	0
Others	0		0
Ending balance	0		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
Ending balance	2,582		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	₩ 2,582		₩ 2,582	₩ 2,582
[1]	KRW8,104 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 included.

Intangible Assets other than _3

Intangible Assets other than Goodwill (Details) $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2018KRW (₩)	Dec. 31, 2017KRW (₩)	Dec. 31, 2018AUD ($)	Dec. 31, 2017AUD ($)
Software | ERP system and others
Disclosure of intangible assets material to entity [Line Items]
Carrying value	₩ 783	₩ 1,135
Remaining amortisation period of intangible assets material to entity	2 years and 2 months ~ 2 years and 4 months	3 years and 2 months ~ 3 years and 4 months
Software | AMI GATEWAY S/W
Disclosure of intangible assets material to entity [Line Items]
Carrying value		₩ 3,528
Remaining amortisation period of intangible assets material to entity		3 years and 2 months
Software | Electricity sales information system
Disclosure of intangible assets material to entity [Line Items]
Carrying value	₩ 6,477
Remaining amortisation period of intangible assets material to entity	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	₩ 9,256	₩ 11,724
Remaining amortisation period of intangible assets material to entity	3 years and 9 months	4 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	₩ 46,594
Remaining amortisation period of intangible assets material to entity	9 years
Mining rights | Mining right of Bylong mine
Disclosure of intangible assets material to entity [Line Items]
Carrying value | $			$ 401,225	$ 401,225
Remaining amortisation period of intangible assets material to entity	Mining rights are amortized using the units-of-production method and the amortization has not commenced yet.	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	₩ 22,337	₩ 29,391
Remaining amortisation period of intangible assets material to entity	3 years and 3 months	4 years 3 months
Intangible assets under development | Contributions to ARP NRC DC
Disclosure of intangible assets material to entity [Line Items]
Carrying value		₩ 46,458
Remaining amortisation period of intangible assets material to entity		-
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	₩ 14,167	₩ 20,463
Remaining amortisation period of intangible assets material to entity	2 years 3 months	3 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	₩ 35,923	₩ 40,460
Remaining amortisation period of intangible assets material to entity	7 years and 11 months	8 years and 11 months
Others | Occupancy and use of public waters
Disclosure of intangible assets material to entity [Line Items]
Carrying value	₩ 97,858	₩ 103,269
Remaining amortisation period of intangible assets material to entity	17 years 11 months	18 years 11 months

Research and development expens

Research and development expenses (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Research and Development Expense [Abstract]
Research and development expense	₩ 723,888	₩ 721,437	₩ 705,504

Trade and Other Payables (Detai

Trade and Other Payables (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Trade and other payables [Line Items]
Trade payables	₩ 3,411,830	₩ 2,936,990
Other trade payables	4,257,736	4,474,972
Accrued expenses	1,129,655	1,089,795
Leasehold deposits received	3,033	2,870
Other deposits received	241,770	289,713
Finance lease liabilities	283,806	418,260	₩ 541,179
Dividends payable	6,443	4,448
Trade and other payables Others
Advance received from local governments	5,818	5,818
Others	7,000	135
Others	12,818	5,953
Total trade and other payables	9,347,091	9,223,001
Current trade and other payables
Trade and other payables [Line Items]
Trade payables	3,411,830	2,936,990
Other trade payables	1,630,860	1,649,933
Accrued expenses	1,127,796	1,087,844
Leasehold deposits received	1,949	1,562
Other deposits received	169,317	186,817
Finance lease liabilities	57,200	131,792
Dividends payable	6,443	4,448
Trade and other payables Others
Advance received from local governments	0	0
Others	0	135
Others	0	135
Total trade and other payables	6,405,395	5,999,521
Non-current trade and other payables
Trade and other payables [Line Items]
Trade payables	0	0
Other trade payables	2,626,876	2,825,039
Accrued expenses	1,859	1,951
Leasehold deposits received	1,084	1,308
Other deposits received	72,453	102,896
Finance lease liabilities	226,606	286,468
Dividends payable	0	0
Trade and other payables Others
Advance received from local governments	5,818	5,818
Others	7,000	0
Others	12,818	5,818
Total trade and other payables	₩ 2,941,696	₩ 3,223,480

Borrowings and Debt Securitie_2

Borrowings and Debt Securities (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Current Borrowings and Debt Securities
Short-term borrowings			₩ 860,602	₩ 1,038,328
Current portion of long-term borrowings			312,994	128,543
Current portion of debt securities			6,790,778	7,961,182
Less : Current portion of discount on long-term borrowings			(972)	(886)
Less : Current portion of discount on debt securities			(1,974)	(3,882)
Add : Current portion of premium on debt securities			20	0
Current Borrowings and Debt Securities			7,961,448	9,123,285
Non-current Borrowings and Debt Securities
Long-term borrowings			3,280,015	2,455,737
Debt securities			49,905,077	43,270,825
Less : Discount on long-term borrowings			(22,000)	(21,113)
Less : Discount on debt securities			(89,913)	(81,424)
Add : Premium on debt securities			0	82
Non-current Borrowings and Debt Securities			53,073,179	45,624,107
Total	₩ 61,034,627	₩ 54,747,392	₩ 61,034,627	₩ 54,747,392
Changes in borrowings and debt securities
Beginning balance	54,747,392	53,639,205
Cash flow	5,972,336	2,269,513
Effect of exchange rate fluctuations	322,515	(1,169,418)
Others	(7,616)	8,092
Ending balance	₩ 61,034,627	₩ 54,747,392

Borrowings and Debt Securitie_3

Borrowings and Debt Securities - Repayment schedule of borrowings and debt securities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Repayment schedule of borrowings and debt securities [Line Items]
Borrowings	₩ 4,453,611	₩ 3,622,608
Debt Securities	56,695,855	51,232,007
Less than 1 year
Repayment schedule of borrowings and debt securities [Line Items]
Borrowings	1,173,596	1,166,871
Debt Securities	6,790,778	7,961,182
1~5 Years
Repayment schedule of borrowings and debt securities [Line Items]
Borrowings	1,911,226	1,117,222
Debt Securities	30,175,734	25,047,075
Over 5 Years
Repayment schedule of borrowings and debt securities [Line Items]
Borrowings	1,368,789	1,338,515
Debt Securities	₩ 19,729,343	₩ 18,223,750

Borrowings and Debt Securitie_4

Borrowings and Debt Securities : Short-term borrowings (Details) ₱ in Thousands, $ in Thousands, $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2018KRW (₩)	Dec. 31, 2017KRW (₩)	Dec. 31, 2018USD ($)	Dec. 31, 2018PHP (₱)	Dec. 31, 2017USD ($)	Dec. 31, 2017AUD ($)
Disclosure of detailed information about Short-term borrowings [Line Items]
Short-term borrowings	₩ 860,602	₩ 1,038,328
Local short-term borrowings
Disclosure of detailed information about Short-term borrowings [Line Items]
Name of Creditor	KTB Investment and securities and others	KTB Investment and securities and others
Borrowings interest rate	2.05~2.51	1.57~2.47
Borrowings, maturity	2019.01.04~ 2019.02.20	2018.01.12~ 2018.09.19
Short-term borrowings	₩ 674,000	₩ 686,561
Foreign short-term borrowings
Disclosure of detailed information about Short-term borrowings [Line Items]
Name of Creditor	SCNT and others	SCNT and others
Borrowings interest rate	4.60~6.50	4.60~6.50
Borrowings, maturity	2019.12.03	2018.12.03
Short-term borrowings	₩ 10,013	₩ 9,594	$ 8,955		$ 8,955
Foreign short-term borrowings
Disclosure of detailed information about Short-term borrowings [Line Items]
Name of Creditor	BDO Unibank	Export-import Bank of Korea
Borrowings interest rate	6.59	3M Libor+0.41~0.63
Borrowings, maturity	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.	2018.12.18
Short-term borrowings	₩ 9,581	₩ 273,314		₱ 450,000		$ 327,259
Local bank overdraft
Disclosure of detailed information about Short-term borrowings [Line Items]
Name of Creditor	Nonghyup Bank	Nonghyup Bank
Borrowings interest rate	2.59~3.09	3.04
Borrowings, maturity	2019.01.10~ 2019.12.31	2018.01.02
Short-term borrowings	₩ 142,773	₩ 51,300
Local bank overdraft
Disclosure of detailed information about Short-term borrowings [Line Items]
Name of Creditor	Woori Bank	Woori Bank
Borrowings interest rate	Standard overdraft rate+1.09	Standard overdraft rate+1.12
Borrowings, maturity	2019.02.26	2018.02.27
Short-term borrowings	₩ 24,235	₩ 17,559

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, 2018KRW (₩)

Dec. 31, 2017KRW (₩)

Dec. 31, 2018JPY (¥)

Dec. 31, 2018USD ($)

Dec. 31, 2018JOD (JD)

Dec. 31, 2018IDR (Rp)

Dec. 31, 2018PKR (₨)

Dec. 31, 2017JPY (¥)

Dec. 31, 2017USD ($)

Dec. 31, 2017JOD (JD)

Dec. 31, 2017IDR (Rp)

Dec. 31, 2017PKR (₨)

Disclosure of detailed information about Long-term borrowings [Line Items]

Borrowings

₩ 3,593,009

₩ 2,584,280

Less : Discount on long-term borrowings

(22,972)

(21,999)

Less : Current portion of long-term borrowings

(312,994)

(128,543)

Add : Current portion of discount on long-term borrowings

972

886

Long-term borrowings

3,258,015

2,434,624

Local long-term borrowings

Disclosure of detailed information about Long-term borrowings [Line Items]

Borrowings

₩ 1,914,531

₩ 1,380,497

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

2019~2044

2018~2044

Borrowings

₩ 4,154

₩ 4,909

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

2.45~4.60

2.45~4.60

Borrowings, maturity

2023~2028

2023~2028

Borrowings

₩ 66,793

₩ 68,883

Local long-term borrowings

Disclosure of detailed information about Long-term borrowings [Line Items]

Name of Creditor

Korea Development Bank

Purpose of borrowings

Facility

Borrowings interest rate

1yr KoFC bond rate+0.31

Borrowings, maturity

2018

Borrowings

₩ 25,000

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

2.59~3.04

2.59~3.04

Borrowings, maturity

2020~2021

2018~2020

Borrowings

₩ 67,000

₩ 47,000

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

2020

Borrowings

₩ 14,000

₩ 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+0.24~0.32

3M CD+0.24~0.32

Borrowings, maturity

2021~2022

2021~2022

Borrowings

₩ 950,000

₩ 400,000

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

₩ 13,781

₩ 15,038

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

2019~2028

2018~2028

Borrowings

₩ 8,072

₩ 8,947

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

₩ 22,500

₩ 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

₩ 22,096

₩ 25,042

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

₩ 5,558

₩ 6,765

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

2019~2024

2018~2024

Borrowings

₩ 2,589

₩ 3,121

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

2022~2025

Borrowings

₩ 1,197

₩ 3,733

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

₩ 17,347

₩ 18,455

Local long-term borrowings

Disclosure of detailed information about Long-term borrowings [Line Items]

Name of Creditor

Shinhan Bank and others

Shinhan Bank and others

Purpose of borrowings

Collateral borrowing

Collateral borrowing

Borrowings interest rate

2.32

2.32

Borrowings, maturity

2019

2019

Borrowings

₩ 30,000

₩ 30,000

Local long-term borrowings

Disclosure of detailed information about Long-term borrowings [Line Items]

Name of Creditor

Shinhan Bank and others

Shinhan Bank and others

Purpose of borrowings

Facility loan

Facility loan

Borrowings interest rate

CB rate+1.10

CB rate+1.10

Borrowings, maturity

2028

2028

Borrowings

₩ 20,672

₩ 22,557

Local long-term borrowings

Disclosure of detailed information about Long-term borrowings [Line Items]

Name of Creditor

Shinhan Bank and others

Purpose of borrowings

Operating funds

Borrowings interest rate

2.70

Borrowings, maturity

2018

Borrowings

₩ 15,000

Local long-term borrowings

Disclosure of detailed information about Long-term borrowings [Line Items]

Name of Creditor

Shinhan Bank and others

Shinhan Bank and others

Purpose of borrowings

Others

Others

Borrowings interest rate

3.95

4.10

Borrowings, maturity

2035

2035

Borrowings

₩ 103,851

₩ 105,000

Local long-term borrowings

Disclosure of detailed information about Long-term borrowings [Line Items]

Name of Creditor

Shinhan Bank and others

Shinhan Bank and others

Purpose of borrowings

Others

Others

Borrowings interest rate

Standard overdraft rate +1.10

Standard overdraft rate +1.10

Borrowings, maturity

2035

2035

Borrowings

₩ 103,851

₩ 105,000

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

₩ 30,333

₩ 35,000

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

1.75~4.60

1.75~4.60

Borrowings, maturity

2026~2036

2026~2029

Borrowings

₩ 168,080

₩ 148,423

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+1.10~1.20

CB rate+1.10~1.20

Borrowings, maturity

2023~2036

2022~2028

Borrowings

₩ 52,810

₩ 46,278

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

₩ 62,500

₩ 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

4.50~8.00

Borrowings, maturity

2022~2039

2022~2039

Borrowings

₩ 102,347

₩ 102,346

Foreign long-term borrowings

Disclosure of detailed information about Long-term borrowings [Line Items]

Borrowings

₩ 1,678,478

₩ 1,203,783

Foreign long-term borrowings

Disclosure of detailed information about Long-term borrowings [Line Items]

Name of Creditor

SCNT and others

Purpose of borrowings

Others

Borrowings interest rate

3.88

Borrowings, maturity

2021

Borrowings

₩ 310,427

$ 278,105

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

₩ 9,776

₩ 9,368

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

₩ 138,542

₩ 69,548

123,909

64,913

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

₩ 249,783

₩ 254,514

JD 158,524

JD 168,663

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

Commercial loan and others

Commercial loan and others

Borrowings interest rate

3M Libor+1.50~2.50

3M Libor+1.50~2.50

Borrowings, maturity

2030~2033

2030~2033

Borrowings

₩ 310,315

₩ 309,662

277,538

289,026

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+1.70~2.50

6M Libor+1.70~2.50

Borrowings, maturity

2032

2032

Borrowings

₩ 141,773

₩ 132,054

126,798

123,253

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

₩ 49,956

₩ 44,697

44,680

41,718

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

₩ 7,647

₩ 7,750

JD 4,853

JD 5,136

Foreign long-term borrowings

Disclosure of detailed information about Long-term borrowings [Line Items]

Name of Creditor

PT PJB

PT PJB

Purpose of borrowings

Shareholder's loan

Shareholder's loan

Borrowings interest rate

12.75

12.75

Borrowings, maturity

2019

2019

Borrowings

₩ 428

₩ 864

Rp 5,569,304

Rp 10,932,568

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

₩ 53,565

₩ 50,540

¥ 5,286,835

¥ 5,325,000

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

₩ 34,553

₩ 32,602

¥ 3,410,381

¥ 3,435,000

Foreign long-term borrowings

Disclosure of detailed information about Long-term borrowings [Line Items]

Name of Creditor

SMBC and others

SMBC and others

Purpose of borrowings

Equity Bridge Loan

Equity Bridge Loan

Borrowings interest rate

1M Libor+0.90

1M Libor+0.90

Borrowings, maturity

2019

2019

Borrowings

₩ 49,218

₩ 76,054

44,019

70,986

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

₩ 206,944

₩ 161,195

₨ 25,900,420

₨ 16,652,350

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

Borrowings, maturity

2031~2038

2031

Borrowings

₩ 114,406

₩ 51,819

102,322

48,366

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

2019

Borrowings

₩ 1,145

₩ 3,116

$ 1,025

$ 2,907

Borrowings and Debt Securitie_6

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

12 Months Ended

Dec. 31, 2018KRW (₩)

Dec. 31, 2017KRW (₩)

Dec. 31, 2018USD ($)

Dec. 31, 2018EUR (€)

Dec. 31, 2018CHF (SFr)

Dec. 31, 2018HKD ($)

Dec. 31, 2018AUD ($)

Dec. 31, 2018SEK (kr)

Dec. 31, 2017JPY (¥)

Dec. 31, 2017USD ($)

Dec. 31, 2017EUR (€)

Dec. 31, 2017CHF (SFr)

Dec. 31, 2017AUD ($)

Dec. 31, 2017SEK (kr)

Debt Instrument [Line Items]

Bonds issued

₩ 56,695,855

₩ 51,232,007

Less : Discount on debt securities

(91,887)

(85,306)

Add : Premium on debt securities

20

82

Less : Current portion of debt securities

(6,790,778)

(7,961,182)

Add : Current portion of discount on debt securities

1,974

3,882

Less: Current portion of premium on foreign debt securities

(20)

0

Total

49,815,164

43,189,483

Local Debt securities

Debt Instrument [Line Items]

Bonds issued

47,703,228

41,972,708

Less : Discount on debt securities

(41,247)

(37,816)

Less : Current portion of debt securities

(5,330,000)

(5,200,000)

Add : Current portion of discount on debt securities

1,035

923

Total

₩ 42,333,016

₩ 36,735,815

Electricity Bonds

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2009.12.03~ 2018.12.04

2009.12.03~ 2017.12.14

Debt Instrument, Maturity Date, Description

2019.01.08~ 2048.10.29

2018.01.07~ 2037.09.18

Interest rate (%)

1.62~5.45

1.62~5.45

Bonds issued

₩ 24,480,000

₩ 20,700,000

Electricity Bonds

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2013.06.25

Debt Instrument, Maturity Date, Description

2018.06.25

Interest rate (%)

3M CD+0.31

Bonds issued

₩ 150,000

Corporate bonds

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

[1]

2009.05.04~ 2018.11.09

2009.05.04~ 2017.11.10

Debt Instrument, Maturity Date, Description

[1]

2019.01.21~2048.11.09

2018.01.18~2047.10.17

Interest rate (%)

[1]

1.36~6.00

1.36~5.84

Bonds issued

[1]

₩ 23,223,228

₩ 21,122,708

Foreign Debt securities

Debt Instrument [Line Items]

Bonds issued

8,992,627

9,259,299

Less : Discount on debt securities

(50,640)

(47,490)

Add : Premium on debt securities

20

82

Less : Current portion of debt securities

(1,460,778)

(2,761,182)

Add : Current portion of discount on debt securities

939

2,959

Less: Current portion of premium on foreign debt securities

(20)

0

Total

₩ 7,482,148

₩ 6,453,668

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

2026.12.06~2096.04.01

Interest rate (%)

6.00~8.37

6.00~8.37

Bonds issued

₩ 278,488

₩ 266,854

$ 249,071

$ 249,070

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

₩ 351,885

₩ 337,188

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

₩ 320,805

₩ 307,406

286,920

286,920

FY-08

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2008.11.27

Debt Instrument, Maturity Date, Description

2018.11.27

Interest rate (%)

4.19

Bonds issued

₩ 189,822

¥ 20,000,000

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

₩ 559,050

₩ 535,700

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

₩ 838,575

₩ 803,550

750,000

750,000

FY-13

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2013.02.05~2013.11.27

Debt Instrument, Maturity Date, Description

2018.02.05~2018.11.27

Interest rate (%)

1.88~2.88

Bonds issued

₩ 2,035,660

1,900,000

FY-13

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2013.09.26~2013.10.23

2013.09.26~2013.10.23

Debt Instrument, Maturity Date, Description

2019.03.26~2019.04.23

2019.03.26~2019.04.23

Interest rate (%)

1.50~1.63

1.50~1.63

Bonds issued

₩ 454,488

₩ 437,888

SFr 400,000

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

₩ 256,038

₩ 271,427

$ 325,000

$ 325,000

FY-13

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2013.02.20~2013.07.25

Debt Instrument, Maturity Date, Description

2018.02.20~2018.07.25

Interest rate (%)

3M Libor+0.84~1.50

Bonds issued

₩ 535,700

500,000

FY-14

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2014.02.11~2014.12.02

2014.02.11~2014.12.02

Debt Instrument, Maturity Date, Description

2019.02.11~2029.07.30

2019.02.11~2029.07.30

Interest rate (%)

2.38~3.57

2.38~3.57

Bonds issued

₩ 1,677,150

₩ 1,607,100

1,500,000

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

₩ 335,430

₩ 321,420

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

₩ 335,430

₩ 321,420

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

₩ 1,229,910

₩ 1,178,540

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

₩ 51,166

₩ 51,170

€ 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

₩ 56,061

₩ 58,454

kr 450,000

kr 450,000

FY-18

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2018.01.29~2018.07.25

Debt Instrument, Maturity Date, Description

2021.01.29~2023.07.25

Interest rate (%)

3.00~3.88

Bonds issued

₩ 2,012,580

$ 1,800,000

FY-18

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2018.03.13

Debt Instrument, Maturity Date, Description

2028.03.13

Interest rate (%)

3.35

Bonds issued

₩ 235,571

$ 1,650,000

[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.

Finance Lease Liabilities (Deta

Finance Lease Liabilities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Finance Lease Liabilities [Line Items]
Minimum lease payments	₩ 381,742	₩ 556,276
Present value of minimum lease payments	283,806	418,260
Less than 1 year
Finance Lease Liabilities [Line Items]
Minimum lease payments	87,709	174,534
Present value of minimum lease payments	57,200	131,792
1~5 Years
Finance Lease Liabilities [Line Items]
Minimum lease payments	228,783	272,994
Present value of minimum lease payments	170,676	204,069
More than 5 years
Finance Lease Liabilities [Line Items]
Minimum lease payments	65,250	108,748
Present value of minimum lease payments	₩ 55,930	₩ 82,399

Finance Lease Liabilities _ Liq

Finance Lease Liabilities : Liquidity classification (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Finance Lease Liabilities [Abstract]
Current finance lease liabilities	₩ 57,200	₩ 131,792
Non-current finance lease liabilities	226,606	286,468
Total Finance Lease Liabilities	₩ 283,806	₩ 418,260

Finance Lease Liabilities _ Lea

Finance Lease Liabilities : Lease payments recognized as an expense from a lessee position (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Lease and sublease payments recognised as expense [Abstract]
Minimum lease payment	₩ 111,530	₩ 158,859
Contingent rent payment	₩ (18,872)	₩ (21,024)

Changes in finance lease liabil

Changes in finance lease liabilities (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure - Changes in finance lease liabilities [Abstract]
Beginning balance of Finance Lease Liabilities	₩ 418,260	₩ 541,179
Cash flow	(134,454)	(122,919)
Acquisition of finance lease assets	0	0
Ending balance of Finance Lease Liabilities	₩ 283,806	₩ 418,260

Employment benefit obligations

Employment benefit obligations (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Employment Benefits [Abstract]
Net defined benefit obligations	₩ 1,638,785	₩ 1,476,201
Other long-term employee benefit obligations	6,284	6,868
Employee benefits liabilities, net	₩ 1,645,069	₩ 1,483,069

Principal assumptions on actuar

Principal assumptions on actuarial valuation (Details) - ₩ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure - Principal assumptions on actuarial valuation [Abstract]
Discount rate	2.24% ~ 2.90%	2.75% ~ 2.90%
Future salary and benefit levels	4.88%	4.88%
Weighted average duration	13.71	13.4

Details of expense relating to

Details of expense relating to defined benefit plans (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure - Details of expense relating to defined benefit plans [Abstract]
Current service cost	₩ 369,899	₩ 392,820	₩ 378,930
Interest cost	87,687	79,524	67,104
Expected return on plan assets	(42,135)	(31,307)	(23,612)
Loss from settlement	(767)	(1,055)	(706)
Defined benefit	₩ 414,684	₩ 439,982	₩ 421,716

Details of expense relating t_2

Details of expense relating to defined benefit plans by nature (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure - Details of expense relating to defined benefit plans by nature [Abstract]
Defined benefit allocated to Cost of sales	₩ 308,672	₩ 332,249	₩ 312,391
Defined benefit allocated to Selling, general and administrative expense	51,903	59,111	61,362
Defined benefit allocated to others	54,109	48,622	47,963
Defined benefit	₩ 414,684	₩ 439,982	₩ 421,716

Defined benefit plan assets and

Defined benefit plan assets and liabilities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure - Defined benefit plan assets and liabilities [Abstract]
Present value of defined benefit obligation from funded plans	₩ 3,414,116	₩ 2,951,842
Fair value of plan assets	(1,775,331)	(1,475,641)
Net surplus (deficit) in plan	1,638,785	1,476,201
Present value of defined benefit obligation from unfunded plans	0	0
Net liabilities incurred from defined benefit plans	₩ 1,638,785	₩ 1,476,201

Net defined benefit liability (

Net defined benefit liability (asset) (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of defined benefit plans [Line Items]
Beginning balance		₩ 1,476,201
Changes in net defined benefit liability (asset)
Current service cost		369,899	₩ 392,820	₩ 378,930
Remeasurement component		167,247	(247,788)
Loss from settlement		767	1,055	706
Ending balance		1,638,785	1,476,201
Defined benefit obligation
Disclosure of defined benefit plans [Line Items]
Beginning balance		2,951,842	2,867,377
Changes in net defined benefit liability (asset)
Current service cost		369,899	392,820
Interest expense (income)	[1]	87,687	79,524
Remeasurement component		154,939	(258,223)
Loss from settlement		(767)	(1,055)
Actual payments		(149,454)	(128,707)
Others		(30)	106
Ending balance		3,414,116	2,951,842	2,867,377
Plan assets
Disclosure of defined benefit plans [Line Items]
Beginning balance		(1,475,641)	(1,188,907)
Changes in net defined benefit liability (asset)
Interest expense (income)		(42,135)	(31,307)
Remeasurement component		12,308	10,435
Contributions by the employers		(330,064)	(325,080)
Actual payments		60,201	59,218
Ending balance		₩ (1,775,331)	₩ (1,475,641)	₩ (1,188,907)
[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, 2018	Dec. 31, 2017
Disclosure of fair value of plan assets [Abstract]
Equity instruments	₩ 96,823	₩ 79,204
Debt instruments	510,184	517,040
Bank deposit	275,518	293,477
Others	892,806	585,920
Plan assets	₩ 1,775,331	₩ 1,475,641

Gain (loss) on remeasurement, n

Gain (loss) on remeasurement, net defined benefit liability (asset) (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Gain (loss) on remeasurement, net defined benefit liability (asset) [Abstract]
Actuarial gain from changes in financial assumptions	₩ 186,428	₩ (300,058)
Experience adjustments	(31,489)	41,835
Expected return	12,308	10,435
Total loss (gain) on remeasurement, net defined benefit liability (asset)	₩ 167,247	₩ (247,788)

Provisions (Details)

Provisions (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018		Dec. 31, 2017
Disclosure of other provisions [Line Items]
Net carrying value	₩ 18,180,546		₩ 18,362,212
Reconciliation of changes in other provisions
Beginning balance	18,362,212		15,427,139
Changes in other provisions
Increase in provision	2,783,241		5,292,348
Payment	(2,866,381)		(2,395,506)
Reversal of unused amount	(112,453)		(49,115)
Others	13,927		87,346
Ending balance	18,180,546		18,362,212
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	2,137,498		1,999,988
Changes in other provisions
Ending balance	1,594,798		2,137,498
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	16,224,714		13,427,151
Changes in other provisions
Ending balance	16,585,748		16,224,714
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	913,787		810,607
Changes in other provisions
Increase in provision	912,440		984,896
Payment	(843,281)		(880,255)
Reversal of unused amount	(6,599)		(1,461)
Others	0		0
Ending balance	976,347		913,787
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	913,787		810,607
Changes in other provisions
Ending balance	976,347		913,787
Litigation provisions
Disclosure of other provisions [Line Items]
Net carrying value	77,793	[1]	73,576
Reconciliation of changes in other provisions
Beginning balance	73,576		198,237
Changes in other provisions
Increase in provision	234,517	[1]	34,629
Payment	(216,187)	[1]	(152,461)
Reversal of unused amount	(13,847)	[1]	(7,096)
Others	(266)	[1]	267
Ending balance	77,793	[1]	73,576
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	48,621		79,359
Changes in other provisions
Ending balance	40,157		48,621
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	24,955		118,878
Changes in other provisions
Ending balance	37,636		24,955
Provisions For Nuclear Plants Restoration
Disclosure of other provisions [Line Items]
Net carrying value	13,388,134		13,007,228
Reconciliation of changes in other provisions
Beginning balance	13,007,228		10,195,928
Changes in other provisions
Increase in provision	411,316		2,818,033
Payment	(30,410)		(6,733)
Reversal of unused amount	0		0
Others	0		0
Ending balance	13,388,134		13,007,228
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	13,007,228		10,195,928
Changes in other provisions
Ending balance	13,388,134		13,007,228
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	1,339,046		1,374,225
Changes in other provisions
Increase in provision	435,007		307,682
Payment	(482,699)		(342,861)
Reversal of unused amount	0		0
Others	0		0
Ending balance	1,291,354		1,339,046
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	1,339,046		1,374,225
Changes in other provisions
Ending balance	1,291,354		1,339,046
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	1,638,371		1,479,502
Changes in other provisions
Increase in provision	112,815		222,632
Payment	(66,178)		(63,763)
Reversal of unused amount	0		0
Others	0		0
Ending balance	1,685,008		1,638,371
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	11,494		2,566
Changes in other provisions
Ending balance	4,310		11,494
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	1,626,877		1,476,936
Changes in other provisions
Ending balance	1,680,698		1,626,877
PCBs recovery provisions
Disclosure of other provisions [Line Items]
Net carrying value	147,668		180,087
Reconciliation of changes in other provisions
Beginning balance	180,087		191,744
Changes in other provisions
Increase in provision	4,600		5,309
Payment	(13,758)		(14,266)
Reversal of unused amount	(23,261)		(2,700)
Others	0		0
Ending balance	147,668		180,087
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	180,087		191,744
Changes in other provisions
Ending balance	147,668		180,087
Other recovery provisions
Disclosure of other provisions [Line Items]
Net carrying value	10,477		6,659
Reconciliation of changes in other provisions
Beginning balance	6,659		507
Changes in other provisions
Increase in provision	2,125		5,939
Payment	0		0
Reversal of unused amount	0		0
Others	1,693		213
Ending balance	10,477		6,659
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	6,659		507
Changes in other provisions
Ending balance	10,477		6,659
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	153,756		152,851
Changes in other provisions
Increase in provision	46,366		94,039
Payment	(71,978)		(103,889)
Reversal of unused amount	0		0
Others	9,524		10,755
Ending balance	137,668		153,756
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	153,756		152,851
Changes in other provisions
Ending balance	137,668		153,756
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	243,365		282,608
Changes in other provisions
Increase in provision	141,661		143,178
Payment	(233,328)		(182,421)
Reversal of unused amount	0		0
Others	0		0
Ending balance	151,698		243,365
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	243,365		282,608
Changes in other provisions
Ending balance	151,698		243,365
Provisions for tax
Disclosure of other provisions [Line Items]
Net carrying value	6,845		61
Reconciliation of changes in other provisions
Beginning balance	61		242
Changes in other provisions
Increase in provision	6,821		0
Payment	0		(25)
Reversal of unused amount	0		(136)
Others	(37)		(20)
Ending balance	6,845		61
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	61		106
Changes in other provisions
Ending balance	6,845		61
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		136
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	23,475		29,665
Changes in other provisions
Increase in provision	1,179		3,760
Payment	(67)		0
Reversal of unused amount	(8,432)		(9,945)
Others	(569)		(5)
Ending balance	15,586		23,475
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	0		29,207
Changes in other provisions
Ending balance	1,320		0
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	23,475		458
Changes in other provisions
Ending balance	14,266		23,475
Provisions for RPS
Disclosure of other provisions [Line Items]
Net carrying value	93,919		271,624
Reconciliation of changes in other provisions
Beginning balance	271,624		417,404
Changes in other provisions
Increase in provision	297,802		242,946
Payment	(475,507)		(388,726)
Reversal of unused amount	0		0
Others	0		0
Ending balance	93,919		271,624
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	271,624		417,404
Changes in other provisions
Ending balance	93,919		271,624
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	414,252		249,644
Changes in other provisions
Increase in provision	131,860		422,666
Payment	(350,356)		(256,758)
Reversal of unused amount	(59,569)		(1,300)
Others	0		0
Ending balance	136,187		414,252
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	414,252		249,644
Changes in other provisions
Ending balance	136,187		414,252
Others
Disclosure of other provisions [Line Items]
Net carrying value	61,862		96,925	[2]
Reconciliation of changes in other provisions
Beginning balance	96,925	[2]	43,975
Changes in other provisions
Increase in provision	44,732		6,639	[2]
Payment	(82,632)		(3,348)	[2]
Reversal of unused amount	(745)		(26,477)	[2]
Others	3,582		76,136	[2]
Ending balance	61,862		96,925	[2]
Others | Current Provisions
Disclosure of other provisions [Line Items]
Net carrying value	46,347		80,538
Reconciliation of changes in other provisions
Beginning balance	80,538		4,385
Changes in other provisions
Ending balance	46,347		80,538
Others | Noncurrent Provisions
Disclosure of other provisions [Line Items]
Net carrying value	15,515		16,387
Reconciliation of changes in other provisions
Beginning balance	16,387		39,590
Changes in other provisions
Ending balance	₩ 15,515		₩ 16,387
[1]	As described in note 53.(1), the Company believes that the possibility of economic 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 KRW204,787 million of provision as addition to property, plant and equipment.
[2]	The Company believes that the possibility of economic outflow is probable on the cost of construction suspension of Shin-Kori unit 5 and 6 for three months. For this reason, the Company recognized KRW77,261 million of provision as addition to construction-in-progress.

Changes in government grants (D

Changes in government grants (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Government grants [Line Items]
Government grants	₩ (522,476)	₩ (537,152)
Changes in government grants
Beginning balance	(537,152)	(527,095)
Receipt	(30,416)	(55,533)
Acquisitions	18,239	129,451
Offset the items of depreciation expense and others	40,028	38,354
Disposals	4,124	2,441
Others	(17,299)	(124,770)
Ending balance	(522,476)	(537,152)
Cash
Government grants [Line Items]
Government grants	0	0
Changes in government grants
Beginning balance	0	0
Receipt	(30,416)	(55,533)
Acquisitions	0	0
Offset the items of depreciation expense and others	0	0
Disposals	0	0
Others	30,416	55,533
Ending balance	0	0
Land
Government grants [Line Items]
Government grants	(21,968)	(21,968)
Changes in government grants
Beginning balance	(21,968)	(3,204)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	0	0
Disposals	0	5
Others	0	(18,769)
Ending balance	(21,968)	(21,968)
Buildings
Government grants [Line Items]
Government grants	(63,189)	(63,539)
Changes in government grants
Beginning balance	(63,539)	(61,188)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	6,836	5,996
Disposals	31	28
Others	(6,517)	(8,375)
Ending balance	(63,189)	(63,539)
Structures
Government grants [Line Items]
Government grants	(190,854)	(196,414)
Changes in government grants
Beginning balance	(196,414)	(197,641)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	10,292	10,011
Disposals	3,270	1,905
Others	(8,002)	(10,689)
Ending balance	(190,854)	(196,414)
Machinery
Government grants [Line Items]
Government grants	(173,242)	(183,188)
Changes in government grants
Beginning balance	(183,188)	(111,064)
Receipt	0
Acquisitions	0
Offset the items of depreciation expense and others	18,099	17,390
Disposals	823	489
Others	(8,976)	(90,003)
Ending balance	(173,242)	(183,188)
Vehicles
Government grants [Line Items]
Government grants	(4,220)	(6,322)
Changes in government grants
Beginning balance	(6,322)	(107)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	2,146	1,070
Disposals	0	14
Others	(44)	(7,299)
Ending balance	(4,220)	(6,322)
Equipment
Government grants [Line Items]
Government grants	(418)	(761)
Changes in government grants
Beginning balance	(761)	(732)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	365	454
Disposals	0	0
Others	(22)	(483)
Ending balance	(418)	(761)
Tools
Government grants [Line Items]
Government grants	(675)	(1,027)
Changes in government grants
Beginning balance	(1,027)	(430)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	432	354
Disposals	0	0
Others	(80)	(951)
Ending balance	(675)	(1,027)
Construction in progress
Government grants [Line Items]
Government grants	(54,740)	(49,084)
Changes in government grants
Beginning balance	(49,084)	(135,807)
Receipt	0
Acquisitions	18,239	129,451
Offset the items of depreciation expense and others	0	0
Disposals	0	0
Others	(23,895)	(42,728)
Ending balance	(54,740)	(49,084)
Finance lease assets
Government grants [Line Items]
Government grants	(26)	(27)
Changes in government grants
Beginning balance	(27)	0
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	1	1
Disposals	0	0
Others	0	(28)
Ending balance	(26)	(27)
Investment properties
Government grants [Line Items]
Government grants	(50)	(83)
Changes in government grants
Beginning balance	(83)	(64)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	1	2
Disposals	0	0
Others	32	(21)
Ending balance	(50)	(83)
Software
Government grants [Line Items]
Government grants	(420)	(486)
Changes in government grants
Beginning balance	(486)	(595)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	254	255
Disposals	0	0
Others	(188)	(146)
Ending balance	(420)	(486)
Development expenditures
Government grants [Line Items]
Government grants	(2,110)	(3,702)
Changes in government grants
Beginning balance	(3,702)	(5,152)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	1,591	2,811
Disposals	0
Others	1	(1,361)
Ending balance	(2,110)	(3,702)
Intangible assets under development
Government grants [Line Items]
Government grants	(10,564)	(10,540)
Changes in government grants
Beginning balance	(10,540)	(11,090)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	0	0
Disposals	0	0
Others	(24)	550
Ending balance	(10,564)	(10,540)
Usage rights of donated assets and other
Government grants [Line Items]
Government grants	0	(11)
Changes in government grants
Beginning balance	(11)	(21)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	11	10
Disposals	0	0
Others	0	0
Ending balance	0	(11)
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	0	0
Disposals	0	0
Others	0	0
Ending balance	₩ 0	₩ 0

Deferred Revenues (Details)

Deferred Revenues (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Deferred Revenue [Abstract]
Deferred Revenue, Beginning Balance	₩ 8,325,181	₩ 7,825,765
Increase during the current year / period	875,930	978,389
Recognized as revenue during the current year / period	(594,548)	(478,973)
Deferred Revenue, Ending Balance	₩ 8,606,563	₩ 8,325,181

Non-financial Liabilities (Deta

Non-financial Liabilities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Other Current Liabilities
Disclosure - Other liabilities [Line Items]
Advances received	₩ 3,724,238	₩ 3,772,713
Accrued income	63,038	41,593
Deferred revenue	556,072	476,631
Withholdings	172,454	164,370
Other nonfincial liabilities	1,058,239	1,129,001
Total	5,574,041	5,584,308
Other Noncurrent Liabilities
Disclosure - Other liabilities [Line Items]
Advances received	80,937	181,612
Accrued income	4,690	19,718
Deferred revenue	8,050,491	7,848,550
Withholdings	10,856	10,529
Other nonfincial liabilities	13,059	12,025
Total	₩ 8,160,033	₩ 8,072,434

Details of shares issued (Detai

Details of shares issued (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2018	Dec. 31, 2017
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 KRW1,056,176 million is included.

Details in number of outstandin

Details in number of outstanding capital stock (Details) - ₩ / shares	Dec. 31, 2018	Dec. 31, 2017
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, 2018	Dec. 31, 2017
Share premium [Abstract]
Share premium	₩ 843,758	₩ 843,758

Retained Earnings (Details)

Retained Earnings (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
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		30,088,818	29,016,395
Reserve for equalizing dividends		210,000	210,000
Voluntary reserves		35,906,267	34,833,844
Retained earnings before appropriations		14,007,942	16,931,804
Retained earnings		₩ 51,519,119	₩ 53,370,558	₩ 53,173,871
[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, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of Changes in retained earnings [Abstract]
Beginning balance	₩ 53,370,558	₩ 53,173,871
Effect of change in accounting policy	71,928	0
Net profit for the period attributed to owner of the Company	(1,314,567)	1,298,720	₩ 7,048,581
Changes in equity method retained earnings
Beginning balance	5,122	(4,943)
Ending balance	3,969	5,122	(4,943)
Changes	(1,153)	10,065
Remeasurements of defined benefit liability, net of tax	(100,495)	158,991
Dividend paid	(507,152)	(1,271,089)	(1,990,089)
Ending balance	₩ 51,519,119	₩ 53,370,558	₩ 53,173,871

Dividends Paid (Details)

Dividends Paid (Details) - KRW (₩) ₩ / shares in Units, ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
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)	₩ 790	₩ 1,980	₩ 3,100
Dividend paid	₩ 507,152	₩ 1,271,089	₩ 1,990,089

Changes in Reserve of remeasure

Changes in Reserve of remeasurements (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of Changes in Reserve of remeasurements [Abstract]
Beginning balance	₩ (43,513)	₩ (222,997)
Changes	(154,198)	239,636
Income tax effect	53,703	(80,645)	₩ 49,986
Transfer to reserve for business expansion	(75,373)	20,493
Ending balance	₩ (219,381)	₩ (43,513)	₩ (222,997)

Statement of Appropriation of_3

Statement of Appropriation of retained earnings (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statement of Appropriation of Retained Earnings [Abstract]
Unappropriated retained earnings carried over from prior years	₩ 0	₩ 0
Effect of change in accounting policy	39,813	0
Net income (loss)	(1,095,213)	1,506,852
Remeasurements of defined benefit plans	(65,442)	72,723
Retained earnings before appropriations	(1,120,842)	1,579,575
Transfer from voluntary reserves	1,120,842	0
Subtotal (I+II)	0	1,579,575
Appropriations of retained earnings	0	(1,579,575)
Legal reserve	0	0
Dividends (government, individual) Amount of dividends per share (%) : Current year - W790 (16%) Prior year - W1,980 (40%)	0	(507,152)
Reserve for business expansion	0	(1,072,423)
Unappropriated retained earnings to be carried over to subsequent year	₩ 0	₩ 0

Hybrid bond (Details)

Hybrid bond (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
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, 2018	Dec. 31, 2017
Changes In Other Components Of Equity [Line Items]
Beginning balance	₩ 14,257,309	₩ 14,496,244
Disposal of subsidiary	0	0
Issuance of share capital of subsidiary	1,032	(1,378)
Others	0	25
Effect of change in accounting policy	(76,851)	0
Changes in the unrealized fair value of available- for-sale financial assets, net of tax		(7,102)
Changes in the unrealized fair value of financial assets at FVOCI, net of tax	(34,125)
Shares in other comprehensive loss of associates and joint ventures, net of tax	57,089	(154,991)
Foreign currency translation of foreign operations, net of tax	(32,086)	(95,103)
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax	(1,140)	19,614
Ending balance	14,171,228	14,257,309
Other capital surplus
Changes In Other Components Of Equity [Line Items]
Beginning balance	1,233,793	1,235,146
Issuance of share capital of subsidiary	1,032	(1,378)
Others	0	25
Ending balance	1,234,825	1,233,793
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	846,269	847,622
Issuance of share capital of subsidiary	1,032	(1,378)
Others	0	25
Ending balance	847,301	846,269
Accumulated other comprehensive loss
Changes In Other Components Of Equity [Line Items]
Beginning balance	(271,457)	(33,875)
Effect of change in accounting policy	(76,851)
Changes in the unrealized fair value of available- for-sale financial assets, net of tax		(7,102)
Changes in the unrealized fair value of financial assets at FVOCI, net of tax	(34,125)
Shares in other comprehensive loss of associates and joint ventures, net of tax	57,089	(154,991)
Foreign currency translation of foreign operations, net of tax	(32,086)	(95,103)
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax	(1,140)	19,614
Ending balance	(358,570)	(271,457)
Financial assets at fair value through other comprehensive income
Changes In Other Components Of Equity [Line Items]
Beginning balance	29,268
Effect of change in accounting policy	(76,851)
Changes in the unrealized fair value of financial assets at FVOCI, net of tax	(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	(81,708)	29,268
Available-for-sale financial asset valuation reserve
Changes In Other Components Of Equity [Line Items]
Beginning balance	29,268	36,370
Changes in the unrealized fair value of available- for-sale financial assets, net of tax		(7,102)
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		29,268
Shares in other comprehensive Income (loss) of investments in associates and joint ventures
Changes In Other Components Of Equity [Line Items]
Beginning balance	66,464	221,455
Shares in other comprehensive loss of associates and joint ventures, net of tax	57,089	(154,991)
Ending balance	123,553	66,464
Reserve for overseas operations translation credit
Changes In Other Components Of Equity [Line Items]
Beginning balance	(318,159)	(223,056)
Foreign currency translation of foreign operations, net of tax	(32,086)	(95,103)
Ending balance	(350,245)	(318,159)
Reserve for gain (loss) on valuation of derivatives
Changes In Other Components Of Equity [Line Items]
Beginning balance	(49,030)	(68,644)
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax	(1,140)	19,614
Ending balance	(50,170)	(49,030)
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, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of performance obligations [Line Items]
Total revenue from external customers		₩ 60,033,062	₩ 59,335,889	₩ 59,763,087
Domestic
Disclosure of performance obligations [Line Items]
Total revenue from external customers		57,799,991	55,652,807	55,310,011
Domestic | Performance obligations satisfied at point in time
Disclosure of performance obligations [Line Items]
Total revenue from external customers		57,514,866	55,373,316	54,982,095
Domestic | Performance obligations satisfied over time
Disclosure of performance obligations [Line Items]
Total revenue from external customers		285,125	279,491	327,916
Overseas
Disclosure of performance obligations [Line Items]
Total revenue from external customers	[1]	2,233,071	3,683,082	4,453,076
Overseas | Performance obligations satisfied at point in time
Disclosure of performance obligations [Line Items]
Total revenue from external customers		382,938	399,232	397,392
Overseas | Performance obligations satisfied over time
Disclosure of performance obligations [Line Items]
Total revenue from external customers		₩ 1,850,133	₩ 3,283,850	₩ 4,055,684
[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, 2018	Dec. 31, 2017	Dec. 31, 2016
Expenses by nature [Line Items]
Raw materials used	₩ 19,537,928	₩ 15,924,707	₩ 13,470,586
Salaries	4,236,623	4,214,974	4,160,642
Employee benefits expense	440,612	468,946	447,638
Welfare and benefit expense	596,572	723,144	669,934
Insurance expense	106,057	106,091	91,500
Depreciation	9,898,386	9,652,219	8,873,956
Amortization of intangible assets	118,938	113,672	79,715
Bad debt expense	39,784	126,714	38,719
Commission	1,189,284	1,143,435	1,029,058
Advertising expense	40,313	125,436	44,351
Training expense	20,373	21,389	19,661
Vehicle maintenance expense	17,957	17,466	17,406
Publishing expense	6,837	7,920	8,258
Business promotion expense	6,645	8,673	8,313
Rent expense	213,983	186,889	173,690
Telecommunication expense	106,073	98,872	101,373
Transportation expense	5,223	9,640	5,749
Taxes and dues	486,741	486,038	511,493
Expendable supplies expense	38,010	39,725	41,502
Water, light and heating expense	47,269	40,695	35,540
Repairs and maintenance expense	2,219,248	2,111,420	1,971,778
Ordinary development expense	723,888	721,437	705,504
Travel expense	81,427	85,673	79,726
Clothing expense	14,476	13,395	13,636
Survey and analysis expense	4,634	4,359	3,875
Membership fee	12,606	9,604	9,846
Power purchase	18,307,289	14,264,331	10,755,739
Disclosure - Other selling and administrative expenses
Accommodation development expenses	52,822	55,799	186,896
Miscellaneous wages	32,447	32,300	31,907
Litigation and filing expenses	12,853	11,881	12,328
Compensation for damages	19,193	12,297	60,341
Outsourcing expenses	3,036	2,647	3,530
Reward expenses	2,713	2,786	3,267
Overseas market development expenses	1,361	1,876	2,177
Others	23,772	35,123	31,086
Others	2,318,435	4,134,846	4,819,597
General and administrative expenses	2,627,890	2,762,855	2,639,232
Cost of sales	58,207,721	52,098,855	45,549,553
Total expenses, by nature	60,835,611	54,861,710	48,188,785
Selling and administrative expense
Expenses by nature [Line Items]
Raw materials used	0	0
Salaries	757,819	735,383	734,930
Employee benefits expense	65,107	71,094	72,812
Welfare and benefit expense	132,089	179,406	162,243
Insurance expense	12,181	15,414	11,513
Depreciation	214,499	190,245	169,431
Amortization of intangible assets	54,153	44,990	35,171
Bad debt expense	39,784	126,714	38,719
Commission	714,096	673,740	605,879
Advertising expense	30,894	114,519	34,658
Training expense	6,277	7,027	6,314
Vehicle maintenance expense	10,148	9,998	10,390
Publishing expense	3,307	3,672	3,643
Business promotion expense	2,785	3,700	3,477
Rent expense	42,851	38,380	40,020
Telecommunication expense	23,505	24,916	25,448
Transportation expense	686	495	596
Taxes and dues	46,424	48,395	46,531
Expendable supplies expense	6,166	7,731	6,834
Water, light and heating expense	12,629	10,545	9,720
Repairs and maintenance expense	62,580	63,477	75,122
Ordinary development expense	215,494	211,417	188,063
Travel expense	14,363	16,658	16,115
Clothing expense	10,108	8,410	8,273
Survey and analysis expense	705	698	666
Membership fee	1,043	1,122	1,132
Power purchase	0	0	0
Disclosure - Other selling and administrative expenses
Accommodation development expenses	52,822	55,799	186,896
Miscellaneous wages	32,447	32,300	31,907
Litigation and filing expenses	12,853	11,881	12,328
Compensation for damages	19,193	12,297	60,341
Outsourcing expenses	3,036	2,647	3,530
Reward expenses	2,713	2,786	3,267
Overseas market development expenses	1,361	1,876	2,177
Others	23,772	35,123	31,086
Others	148,197	154,709	331,532
General and administrative expenses	2,627,890	2,762,855	2,639,232
Total expenses, by nature	₩ 2,627,890	₩ 2,762,855	₩ 2,639,232

Other Income and Expense (Detai

Other Income and Expense (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other non-operating income [Abstract]
Reversal of other provisions		₩ 12,700	₩ 35,265	₩ 22,034
Reversal of allowance for doubtful accounts		143	2,166	5,489
Gains on government grants		482	430	111
Gains on assets contributed		17,336	4,218	12,254
Gains on liabilities exempted		10,303	3,166	1,959
Compensation and reparations revenue		89,901	89,196	114,530
Revenue from research contracts		6,818	12,580	13,143
Income related to transfer of assets from customers		594,548	478,973	427,297
Rental income		186,631	192,136	211,580
Others of Other Income		51,032	50,988	31,787
Refund of claim for rectification		8,933	9,655	8,722
Adjustment of research project		2,267	3,884	4,148
Maintenance expenses on lease building		176	135	354
Training expenses		3,220	3,045	4,478
Deposit redemption		7	34	991
Reversal of expenses on litigation		753	360	893
Revenue on royalty fee		6,909	2,888	2,486
Reimbursement of insurance fee		7,145	1,498	0
Gains on guarantee contracts		39	456	2,796
Miscellaneous other non-operating income		21,583	29,033	6,919
Other non-operating income		969,894	869,118	840,184
Other non-operating expense
Compensation and indemnification expense		23,437	37	0
Accretion expenses of other provisions		41,924	7,535	4,556
Depreciation expenses on investment properties		923	1,176	678
Depreciation expenses on idle assets		6,547	6,644	6,639
Other bad debt expense		17,827	1,778	4,585
Donations		63,743	119,421	114,094
Others of Other Expense		76,929	43,464	58,072
Operating expenses related to the idle assets		47	136	459
Research grants		461	1,180	1,461
Supporting expenses on farming and fishing village		13,537	11,956	15,201
Operating expenses on fitness center		4,788	3,498	2,706
Expenses on adjustment of research and development grants		404	806	0
Taxes and dues		199	2,270	4,582
Expenses on R&D supporting		53	5,459	690
Miscellaneous other non-operating expense	[1]	57,440	18,159	32,973
Other non-operating expense		₩ 231,330	₩ 180,055	₩ 188,624
[1]	Others include KRW38,886 million of impairment loss on construction-in-progress of Cheonji unit 1 and 2 and Daejin unit 1 and 2 as described in note 2.

Other Gains (Losses) (Details)

Other Gains (Losses) (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Other gains
Gains on disposal of property, plant and equipment	₩ 98,077		₩ 48,316		₩ 74,035
Gains on disposal of intangible assets	12		564		0
Reversal of impairment loss on intangible assets	17		54		3
Gains on foreign currency translation	14,905		20,485		15,311
Gains on foreign currency transaction	47,297		93,151		55,377
Gains on insurance proceeds	0		400		0
Miscellaneous Other Gains	221,556		269,562		187,792
Gains on disposal of inventories	6,350		6,024		9,494
Gains on valuation of inventories	0		0		2
Gains on proxy collection of TV license fee	40,450		39,711		38,991
Gains on compensation of impaired electric poles	1,166		1,526		3,650
Gains on compensation for infringement on contract	3,648		18,990		3,040
Gains on harbor facilities dues	3,803		3,025		2,957
Gains on technical fees	2,026		2,105		1,271
Reversal of occupation development training fees	1,602		1,697		1,756
Gains on disposal of waste	4,232		4,261		4,222
Gains on insurance	22,382		10,410		3,786
Gains on tax rebate	542		2,161		5,226
Gains on other commission	4,347		4,790		4,639
Gains on research tasks	0		0		10
Gains on settlement and others	0		0		2,188
Gains on sales of greenhouse gas emissions rights	0		0		46
Others of Miscellaneous Other Gains	131,008		174,862		106,514
Other losses
Losses on disposal of property, plant and equipment	(60,704)		(70,514)		(42,715)
Losses on disposal of intangible assets	(43)		(183)		(158)
Impairment loss on property, plant and equipment	(710,162)	[1]	(51,067)	[2]
Impairment loss on intangible assets	(8,112)	[3]	(20)		(3,945)
Impairment loss on other non-current assets	(87,024)
Losses on foreign currency translation	(7,678)		(25,495)		(23,835)
Losses on foreign currency transaction	(65,366)		(36,241)		(72,058)
Miscellaneous Other Losses	(63,899)		(92,385)		(119,309)
Losses on valuation of inventories	1,953		3,875		2,683
Losses on disposal of inventories	3,555		3,273		3,092
Losses due to disaster	2,129		5,374		1,522
Losses on rounding adjustment of electric charge surtax	1,265		1,253		1,260
Losses on adjustments of levies	0		1		1,184
Forfeit of taxes and dues	0		656		4,582
Losses on litigation	0		0		2,581
Others Of Miscellaneous Other Losses	54,997		77,953		102,405
Net other gains	₩ (621,124)		₩ 156,627		₩ 70,498
[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 impairment loss in the consolidated statements of comprehensive income. The amount includes impairment loss of KRW703,133 million in relation to Wolsong unit 1, and Shin-Hanul unit 3 and 4 as described in note 2, and the loss of KRW7,031 million due to fire at Taean unit 2.
[2]	Korea Midland 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 impairment loss in the consolidated statements of comprehensive income.
[3]	KRW8,104 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 included.

Finance Income (Details)

Finance Income (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest Income
Cash and cash equivalents	₩ 40,704	₩ 35,474	₩ 61,380
Available-for-sale financial assets		290	0
Financial assets at fair value through profit or loss	21,713
Financial assets at amortized cost	89	0	0
Held-to-maturity investments	0	82	97
Loans and receivables	21,925	30,014	25,106
Short-term financial instrument	41,025	29,412	45,763
Long-term financial instrument	7,920	8,144	7,195
Other financial assets	1	0	0
Trade and other receivables	90,390	102,727	102,237
Total Interest Income	223,767	206,143	241,778
Dividend income	12,777	11,477	9,446
Gains on disposal of financial assets	1,838	1,130	1,482
Gains on valuation of Financial assets at fair value through profit or loss	8,495	12	0
Gains on valuation of derivatives	199,943	16,165	293,830
Gains on transaction of derivatives	179,745	29,257	45,549
Gains on foreign currency translation of Finance Income	143,254	1,115,832	161,905
Gains on foreign currency transaction	27,051	150,602	37,553
Total Finance Income	₩ 796,870	₩ 1,530,618	₩ 791,543

Finance Expenses (Details)

Finance Expenses (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest Expense
Trade and other payables	₩ 42,830	₩ 57,160	₩ 68,375
Short-term borrowings	32,545	35,891	6,969
Long-term borrowings	92,243	87,011	91,584
Debt securities	1,771,544	1,698,232	1,922,900
Other financial liabilities	505,112	491,665	482,428
Interest Expense (Before Capitalizing borrowing costs)	2,444,274	2,369,959	2,572,256
Less: Capitalized borrowing costs	(575,816)	(580,407)	(819,388)
Interest expense	1,868,458	1,789,552	1,752,868
Losses on sale of financial assets	1	2,343	9
Losses on valuation of financial assets at fair value through profit or loss	6,616	0	0
Impairment of available-for-sale financial assets		2,713	86,703
Losses on valuation of derivatives	46,740	890,832	5,762
Losses on transaction of derivatives	32,448	198,218	101,987
Losses on foreign currency translation	393,859	207,944	406,849
Losses on foreign currency transaction	121,763	35,175	57,889
Losses on repayment of financial liabilities	0	5	23,000
Other Finance Expenses	858	1,170	2,020
Total Finance Expense	₩ 2,470,743	₩ 3,127,952	₩ 2,437,087

Income tax expense (benefit) (D

Income tax expense (benefit) (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income tax expense (benefit) [Abstract]
Current income tax expense	₩ 286,375	₩ 829,969	₩ 2,950,812
Payment of income tax	378,715	881,583	2,689,640
Adjustment in respect of prior years due to change in estimate	(195,648)	4,484	231,113
Current income tax directly recognized in equity	101,528	(56,098)	30,059
Income tax directly adjusted to shareholders' equity (except for accumulated other comprehensive income (loss))	4,273	5,223	(1,753)
Dividends of hybrid securities	4,273	5,248	5,253
Gain on disposal of investments in subsidiaries	0	0	(7,006)
Effect of change in effective tax rate	0	(25)	0
Income tax recognized as other comprehensive income (loss)	97,255	(61,321)	31,812
Gain on valuation of financial assets at fair value through other comprehensive income	35,798	0	0
Gain (loss) on valuation of available-for-sale financial assets	0	(2,551)	(8,143)
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax	6,639	(11,016)	(18,335)
Remeasurements of defined benefit obligations	53,703	(80,645)	49,986
Investments in associates	6,592	8,649	7,731
Others	(5,477)	24,242	573
Effect of change in accounting policy	1,780	0	0
Deferred income tax expense (benefit)	(1,112,696)	1,342,855	414,329
Generation and realization of temporary differences	(495,658)	1,283,012	509,762
Changes of unrecognized tax losses, tax credit and temporary differences for prior periods	(28,509)	44,573	(86,845)
Changes in deferred tax on tax losses carryforwards	(572,305)	0	0
Tax credit carryforwards	(16,224)	15,270	(8,588)
Income tax expense (benefit)	₩ (826,321)	₩ 2,172,824	₩ 3,365,141

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, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure - Income tax expense calculated by multiplying net income before tax with the tax rate [Abstract]
Income (loss) before income tax		₩ (2,000,819)	₩ 3,614,218	₩ 10,513,468
Income tax expense (benefit) computed at applicable tax rate	[1]	(550,225)	874,641	2,544,259
Adjustments		(80,448)	1,293,699	589,769
Effect of applying gradual tax rate		(1,408)	(5,082)	(5,082)
Effect of non-taxable income		(1,705)	(32,032)	(29,554)
Effect of non-deductible expenses		40,151	15,032	22,258
Effect of tax losses that are not recognized as deferred tax asset		2,086	0	0
Effects of tax credits and deduction		(39,471)	(161,069)	(194,731)
Recognition (reversal) of unrecognized deferred tax asset, net		(28,509)	44,573	(86,845)
Effect of change in deferred tax due to change in tax rate		261	1,055,154
Deferred income tax related to investments in subsidiaries and associates		(52,618)	394,145	862,956
Others, net		765	(17,022)	20,767
Adjustment in respect of prior years due to change in estimate		(195,648)	4,484	231,113
Income tax expense (benefit)		₩ (826,321)	₩ 2,172,824	₩ 3,365,141
Effective tax rate	[2]		60.00%	32.00%
[1]	Applicable tax rate is 24.2% as of December 31, 2016 and 2017, and 27.5% as of December 31, 2018.
[2]	The effective tax rate for the year ended December 31, 2018 is not calculated for income tax benefit.

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, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	₩ (9,496,244)	₩ (8,153,389)
Amounts recognized in profit or loss	1,011,168	(1,286,757)
Amount recognized in other comprehensive income (loss)	97,255	(61,321)	₩ 31,812
Amounts recognized directly in equity	4,273	5,223	(1,753)
Ending balance	(8,383,548)	(9,496,244)	(8,153,389)
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	(9,516,675)	(8,189,092)
Amounts recognized in profit or loss	422,638	(1,271,485)
Amount recognized in other comprehensive income (loss)	97,255	(61,321)
Amounts recognized directly in equity	4,273	5,223
Ending balance	(8,992,509)	(9,516,675)	(8,189,092)
Employee benefits
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	498,694	493,331
Amounts recognized in profit or loss	42,144	86,008
Amount recognized in other comprehensive income (loss)	53,703	(80,645)
Amounts recognized directly in equity	0	0
Ending balance	594,541	498,694	493,331
Cash flow hedges
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	65,445	(53,583)
Amounts recognized in profit or loss	(32,623)	130,044
Amount recognized in other comprehensive income (loss)	6,639	(11,016)
Amounts recognized directly in equity	0	0
Ending balance	39,461	65,445	(53,583)
Investments in associates or subsidiaries
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	(8,668,016)	(7,166,345)
Amounts recognized in profit or loss	(5,447)	(1,510,295)
Amount recognized in other comprehensive income (loss)	6,592	8,649
Amounts recognized directly in equity	0	(25)
Ending balance	(8,666,871)	(8,668,016)	(7,166,345)
Property, Plant and Equipment
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	(6,860,440)	(5,527,318)
Amounts recognized in profit or loss	337,662	(1,333,122)
Amount recognized in other comprehensive income (loss)	0	0
Amounts recognized directly in equity	0	0
Ending balance	(6,522,778)	(6,860,440)	(5,527,318)
Finance lease
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	(426,949)	(345,431)
Amounts recognized in profit or loss	(26,125)	(81,518)
Amount recognized in other comprehensive income (loss)	0	0
Amounts recognized directly in equity	0	0
Ending balance	(453,074)	(426,949)	(345,431)
Intangible Assets
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	7,648	8,987
Amounts recognized in profit or loss	(1,593)	(1,339)
Amount recognized in other comprehensive income (loss)	0	0
Amounts recognized directly in equity	0	0
Ending balance	6,055	7,648	8,987
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	890	(62)
Amounts recognized in profit or loss	(871)	952
Amount recognized in other comprehensive income (loss)	0	0
Amounts recognized directly in equity	0	0
Ending balance	19	890	(62)
Available-for-sale financial assets
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	(8,843)	(68,347)
Amounts recognized in profit or loss	0	62,055
Amount recognized in other comprehensive income (loss)	0	(2,551)
Amounts recognized directly in equity	0	0
Ending balance	0	(8,843)	(68,347)
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	0	0
Amounts recognized in profit or loss	(1,379)	0
Amount recognized in other comprehensive income (loss)	35,798	0
Amounts recognized directly in equity	0	0
Ending balance	25,576	0	0
Deferred revenue
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	230,711	213,859
Amounts recognized in profit or loss	(10,969)	16,852
Amount recognized in other comprehensive income (loss)	0	0
Amounts recognized directly in equity	0	0
Ending balance	219,742	230,711	213,859
Provisions, others
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	4,822,833	3,583,371
Amounts recognized in profit or loss	(21,887)	1,239,462
Amount recognized in other comprehensive income (loss)	0	0
Amounts recognized directly in equity	0	0
Ending balance	4,800,946	4,822,833	3,583,371
Doubtful receivables
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	59	2,696
Amounts recognized in profit or loss	0	(2,637)
Amount recognized in other comprehensive income (loss)	0	0
Amounts recognized directly in equity	0	0
Ending balance	59	59	2,696
Other finance liabilities
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	32,755	30,249
Amounts recognized in profit or loss	2,465	(2,742)
Amount recognized in other comprehensive income (loss)	0	0
Amounts recognized directly in equity	4,273	5,248
Ending balance	39,493	32,755	30,249
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	(1,354)	138,938
Amounts recognized in profit or loss	28,434	(140,292)
Amount recognized in other comprehensive income (loss)	0	0
Amounts recognized directly in equity	0	0
Ending balance	27,080	(1,354)	138,938
Allowance for doubtful accounts
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	42,931	17,252
Amounts recognized in profit or loss	15,825	25,679
Amount recognized in other comprehensive income (loss)	0	0
Amounts recognized directly in equity	0	0
Ending balance	58,756	42,931	17,252
Accrued income
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	(1,825)	(5,367)
Amounts recognized in profit or loss	(1,089)	3,542
Amount recognized in other comprehensive income (loss)	0	0
Amounts recognized directly in equity	0	0
Ending balance	(2,914)	(1,825)	(5,367)
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	(200,927)	(194,309)
Amounts recognized in profit or loss	(10,819)	(6,618)
Amount recognized in other comprehensive income (loss)	0	0
Amounts recognized directly in equity	0	0
Ending balance	(211,746)	(200,927)	(194,309)
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	(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)	(12,883)
Others
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	952,754	695,870
Amounts recognized in profit or loss	105,869	232,642
Amount recognized in other comprehensive income (loss)	(5,477)	24,242
Amounts recognized directly in equity	0	0
Ending balance	1,053,146	952,754	695,870
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	20,431	35,703
Amounts recognized in profit or loss	588,530	(15,272)
Amount recognized in other comprehensive income (loss)	0	0
Amounts recognized directly in equity	0	0
Ending balance	608,961	20,431	35,703
Unused tax losses
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	0	0
Amounts recognized in profit or loss	554,457	0
Amount recognized in other comprehensive income (loss)	0	0
Amounts recognized directly in equity	0	0
Ending balance	554,457	0	0
Excess of donation limit
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	0	0
Amounts recognized in profit or loss	17,848	0
Amount recognized in other comprehensive income (loss)	0	0
Amounts recognized directly in equity	0	0
Ending balance	17,848	0	0
Tax credit
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	20,431	35,703
Amounts recognized in profit or loss	16,225	(15,272)
Amount recognized in other comprehensive income (loss)	0	0
Amounts recognized directly in equity	0	0
Ending balance	₩ 36,656	₩ 20,431	₩ 35,703

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, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure - Deferred tax assets and liabilities presented on a gross basis prior to any offsetting [Abstract]
Deferred income tax assets	₩ 1,233,761	₩ 919,153
Deferred income tax liabilities	(9,617,309)	(10,415,397)
Net Deferred income tax assets(liabilities)	₩ (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, 2018	Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [Abstract]
Deductible temporary differences	₩ 442,391	₩ 444,426

Assets Held-for-Sale (Details)

Assets Held-for-Sale (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2018	Dec. 31, 2017
Assets Held-for-Sale [Abstract]
Land	[1]	₩ 2,765	₩ 2,765
Building	[1]	19,369	19,369
Investments in associates	[2],[3],[4]	0	5,837
Investments in subsidiaries	[5]	747	0
Assets Held-for-Sale		₩ 22,881	₩ 27,971
[1]	The board of directors of KEPCO Engineering & Construction Company, Inc., a subsidiary of the Company, determined to dispose the office building in Yongin as part of the government's plan to relocate state-run companies for balanced national development and moved the head office to Kimchun, Kyungsangbukdo, in 2015. As the Company believes the book value of Yongin office will be recovered by a disposal transaction rather than continuous operation, it reclassified buildings, land and structures as assets held-for-sale.
[2]	KEPCO Engineering & Construction Company, Inc., a subsidiary of the Company, exercised a put option to sell the shares of DS POWER Co., Ltd. on December 11, 2017 and the shares were sold on February 28, 2018.
[3]	Korea Hydro & Nuclear Power Co., Ltd., a subsidiary of the Company, initiated efforts to sell its shares in Yeongwol Energy Station Co., Ltd. during the year ended December 31, 2016, and sold its shares in Yeongwol Energy Station Co. during the year ended December 31, 2018.
[4]	Korea Western Power Co., Ltd., a subsidiary of the Company, planned to dispose certain portion of its investment in Dongducheon Dream Power Co., Ltd. and had classified the relevant book value as non-current assets held-for-sale. However, due to uncertainty of sale, it reclassified the relevant book value to investments in associates during the year ended December 31, 2017.
[5]	KOWEPO India Private Limited was in the process of liquidating its business as of December 31, 2018 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, 2018	Dec. 31, 2017	Dec. 31, 2016
Expenses by nature [Line Items]
Raw materials used	₩ 19,537,928	₩ 15,924,707	₩ 13,470,586
Salaries	4,236,623	4,214,974	4,160,642
Employee benefits expense	440,612	468,946	447,638
Welfare and benefit expense	596,572	723,144	669,934
Insurance expense	106,057	106,091	91,500
Depreciation	9,898,386	9,652,219	8,873,956
Amortization of intangible assets	118,938	113,672	79,715
Bad debt expense	39,784	126,714	38,719
Commission	1,189,284	1,143,435	1,029,058
Advertising expense	40,313	125,436	44,351
Training expense	20,373	21,389	19,661
Vehicle maintenance expense	17,957	17,466	17,406
Publishing expense	6,837	7,920	8,258
Business promotion expense	6,645	8,673	8,313
Rental expense	213,983	186,889	173,690
Telecommunication expense	106,073	98,872	101,373
Transportation expense	5,223	9,640	5,749
Taxes and dues	486,741	486,038	511,493
Expendable supplies expense	38,010	39,725	41,502
Water, light and heating expense	47,269	40,695	35,540
Repairs and maintenance expense	2,219,248	2,111,420	1,971,778
Ordinary development expense	723,888	721,437	705,504
Travel expense	81,427	85,673	79,726
Clothing expense	14,476	13,395	13,636
Survey and analysis expense	4,634	4,359	3,875
Membership fee	12,606	9,604	9,846
Power purchase	18,307,289	14,264,331	10,755,739
Disclosure - Other selling and administrative expenses
Accommodation development expenses	52,822	55,799	186,896
Miscellaneous wages	32,447	32,300	31,907
Litigation and filing expenses	12,853	11,881	12,328
Compensation for damages	19,193	12,297	60,341
Outsourcing expenses	3,036	2,647	3,530
Reward expenses	2,713	2,786	3,267
Overseas market development expenses	1,361	1,876	2,177
Others	23,772	35,123	31,086
Others	2,318,435	4,134,846	4,819,597
General and administrative expenses	2,627,890	2,762,855	2,639,232
Cost of sales	58,207,721	52,098,855	45,549,553
Total expenses, by nature	60,835,611	54,861,710	48,188,785
Selling and administrative expense
Expenses by nature [Line Items]
Raw materials used	0	0
Salaries	757,819	735,383	734,930
Employee benefits expense	65,107	71,094	72,812
Welfare and benefit expense	132,089	179,406	162,243
Insurance expense	12,181	15,414	11,513
Depreciation	214,499	190,245	169,431
Amortization of intangible assets	54,153	44,990	35,171
Bad debt expense	39,784	126,714	38,719
Commission	714,096	673,740	605,879
Advertising expense	30,894	114,519	34,658
Training expense	6,277	7,027	6,314
Vehicle maintenance expense	10,148	9,998	10,390
Publishing expense	3,307	3,672	3,643
Business promotion expense	2,785	3,700	3,477
Rental expense	42,851	38,380	40,020
Telecommunication expense	23,505	24,916	25,448
Transportation expense	686	495	596
Taxes and dues	46,424	48,395	46,531
Expendable supplies expense	6,166	7,731	6,834
Water, light and heating expense	12,629	10,545	9,720
Repairs and maintenance expense	62,580	63,477	75,122
Ordinary development expense	215,494	211,417	188,063
Travel expense	14,363	16,658	16,115
Clothing expense	10,108	8,410	8,273
Survey and analysis expense	705	698	666
Membership fee	1,043	1,122	1,132
Power purchase	0	0	0
Disclosure - Other selling and administrative expenses
Accommodation development expenses	52,822	55,799	186,896
Miscellaneous wages	32,447	32,300	31,907
Litigation and filing expenses	12,853	11,881	12,328
Compensation for damages	19,193	12,297	60,341
Outsourcing expenses	3,036	2,647	3,530
Reward expenses	2,713	2,786	3,267
Overseas market development expenses	1,361	1,876	2,177
Others	23,772	35,123	31,086
Others	148,197	154,709	331,532
General and administrative expenses	2,627,890	2,762,855	2,639,232
Total expenses, by nature	2,627,890	2,762,855	2,639,232
Cost of sales
Expenses by nature [Line Items]
Raw materials used	19,537,928	15,924,707	13,470,586
Salaries	3,478,804	3,479,591	3,425,712
Employee benefits expense	375,505	397,852	374,826
Welfare and benefit expense	464,483	543,738	507,691
Insurance expense	93,876	90,677	79,987
Depreciation	9,683,887	9,461,974	8,704,525
Amortization of intangible assets	64,785	68,682	44,544
Bad debt expense	0	0	0
Commission	475,188	469,695	423,179
Advertising expense	9,419	10,917	9,693
Training expense	14,096	14,362	13,347
Vehicle maintenance expense	7,809	7,468	7,016
Publishing expense	3,530	4,248	4,615
Business promotion expense	3,860	4,973	4,836
Rental expense	171,132	148,509	133,670
Telecommunication expense	82,568	73,956	75,925
Transportation expense	4,537	9,145	5,153
Taxes and dues	440,317	437,643	464,962
Expendable supplies expense	31,844	31,994	34,668
Water, light and heating expense	34,640	30,150	25,820
Repairs and maintenance expense	2,156,668	2,047,943	1,896,656
Ordinary development expense	508,394	510,020	517,441
Travel expense	67,064	69,015	63,611
Clothing expense	4,368	4,985	5,363
Survey and analysis expense	3,929	3,661	3,209
Membership fee	11,563	8,482	8,714
Power purchase	18,307,289	14,264,331	10,755,739
Disclosure - Other selling and administrative expenses
Others	2,170,238	3,980,137	4,488,065
Cost of sales	58,207,721	52,098,855	45,549,553
Total expenses, by nature	₩ 58,207,721	₩ 52,098,855	₩ 45,549,553

Basic earnings (loss) per share

Basic earnings (loss) per share (Details) - KRW (₩) ₩ / shares in Units, ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Basic earnings (loss) per share [Abstract]
Net profit (loss) for the period attributed to owner of the Company	₩ (1,314,567)	₩ 1,298,720	₩ 7,048,581
Profit (loss) used in the calculation of total basic earnings (loss) per share	₩ (1,314,567)	₩ 1,298,720	₩ 7,048,581
Weighted average number of common shares	641,964,077	641,964,077	641,964,077
Basic earnings (loss) per share	₩ (2,048)	₩ 2,023	₩ 10,980

Diluted earnings (loss) per sha

Diluted earnings (loss) per share (Details) - KRW (₩) ₩ / shares in Units, ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Diluted earnings (loss) per share [Abstract]
Profit (loss) used in the calculation of total diluted earnings (loss) per share	₩ (1,314,567)	₩ 1,298,720	₩ 7,048,581
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	₩ (2,048)	₩ 2,023	₩ 10,980

Capital risk management (Detail

Capital risk management (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of Capital risk management [Abstract]
Total borrowings and debt securities	₩ 61,034,627	₩ 54,747,392
Cash and cash equivalents	1,358,345	2,369,739	₩ 3,051,353	₩ 3,783,065
Net borrowings and debt securities	59,676,282	52,377,653
Total shareholder's equity	₩ 71,092,762	₩ 72,964,641	₩ 73,050,545	₩ 67,942,475
Debt to equity ratio	83.94%	71.78%

Maximum exposure to credit risk

Maximum exposure to credit risk (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2018	Dec. 31, 2017
Cash and Cash Equivalents
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk		₩ 1,358,345	₩ 2,369,739
Not Designated as Hedging Instrument
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk		37,631	22,020
Financial assets at fair value through other comprehensive income
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk		399,495
Designated as Hedging Instrument
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk		64,704	10,606
Available-for-sale financial assets
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk			699,833
Financial assets at amortized cost
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk		14,042
Held-to-maturity investments
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk			3,144
Loans and receivables
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk		718,674	905,641
Long-term/short-term financial instruments
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk		2,318,027	2,244,514
Financial assets at fair value through profit or loss
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk		920,935	111,512
Trade and other receivables
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk		9,613,437	9,683,769
Provisions for financial guarantee
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk	[1]	₩ 1,310,817	₩ 1,154,862
[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, 2018	Dec. 31, 2017
Actuarial assumption of expected rates of salary increases
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
1% Increase	₩ 416,956	₩ 354,852
1% Decrease	(363,820)	(305,494)
Actuarial assumption of discount rates
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
1% Increase	(377,221)	(313,597)
1% Decrease	₩ 445,833	₩ 377,148

Principal assumptions on provis

Principal assumptions on provisions valuation (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
PCBs
Disclosure of Principal assumptions on provisions valuation [Line Items]
Inflation rate	1.27%	1.23%
Discount rate	2.18%	2.55%
Nuclear plants
Disclosure of Principal assumptions on provisions valuation [Line Items]
Inflation rate	1.21%	1.21%
Discount rate	2.94%	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, 2018	Dec. 31, 2017
PCBs | Discount rate
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]
0.1% Increase	₩ (623)	₩ (811)
0.1% Decrease	627	816
PCBs | Inflation rate
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]
0.1% Increase	632	826
0.1% Decrease	(629)	(822)
Nuclear plants | Discount rate
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]
0.1% Increase	(256,513)	(262,949)
0.1% Decrease	263,595	270,370
Nuclear plants | Inflation rate
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]
0.1% Increase	294,984	287,926
0.1% Decrease	(287,110)	(280,249)
Spent fuel | Discount rate
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]
0.1% Increase	(49,182)	(51,015)
0.1% Decrease	51,098	52,997
Spent fuel | Inflation rate
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]
0.1% Increase	51,837	53,763
0.1% Decrease	₩ (49,961)	₩ (51,823)

Foreign currency risk (Details)

Foreign currency risk (Details) ₸ 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, K in Thousands, JD in Thousands, GH₵ in Thousands, Ar in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands

Dec. 31, 2018JPY (¥)

Dec. 31, 2018USD ($)

Dec. 31, 2018PHP (₱)

Dec. 31, 2018EUR (€)

Dec. 31, 2018INR (₨)

Dec. 31, 2018SAR (ر.س)

Dec. 31, 2018CAD ($)

Dec. 31, 2018ZAR (R)

Dec. 31, 2018JOD (JD)

Dec. 31, 2018CHF (SFr)

Dec. 31, 2018HKD ($)

Dec. 31, 2018AUD ($)

Dec. 31, 2018SEK (kr)

Dec. 31, 2018AED (د.إ)

Dec. 31, 2018BDT (৳)

Dec. 31, 2018BWP (P)

Dec. 31, 2018CNY (¥)

Dec. 31, 2018GBP (£)

Dec. 31, 2018IDR (Rp)

Dec. 31, 2018KZT (₸)

Dec. 31, 2018MGA (Ar)

Dec. 31, 2018NOK (kr)

Dec. 31, 2018PKR (₨)

Dec. 31, 2018UYU ($)

Dec. 31, 2018MMK (K)

Dec. 31, 2018GHS (GH₵)

Dec. 31, 2017JPY (¥)

Dec. 31, 2017USD ($)

Dec. 31, 2017PHP (₱)

Dec. 31, 2017EUR (€)

Dec. 31, 2017INR (₨)

Dec. 31, 2017SAR (ر.س)

Dec. 31, 2017CAD ($)

Dec. 31, 2017ZAR (R)

Dec. 31, 2017JOD (JD)

Dec. 31, 2017CHF (SFr)

Dec. 31, 2017AUD ($)

Dec. 31, 2017SEK (kr)

Dec. 31, 2017AED (د.إ)

Dec. 31, 2017BDT (৳)

Dec. 31, 2017BWP (P)

Dec. 31, 2017CNY (¥)

Dec. 31, 2017GBP (£)

Dec. 31, 2017IDR (Rp)

Dec. 31, 2017KZT (₸)

Dec. 31, 2017MGA (Ar)

Dec. 31, 2017NOK (kr)

Dec. 31, 2017PKR (₨)

Dec. 31, 2017UYU ($)

Disclosure of Foreign currency risk [Abstract]

Assets

¥ 35,935

$ 1,422,510

₱ 709,285

€ 337

₨ 1,228,795

ر.س 2,024

$ 96

R 170

JD 2,764

SFr 0

$ 0

$ 143

kr 0

د.إ 10,513

৳ 71,575

P 1,214

¥ 0

£ 0

Rp 60,568

₸ 319

Ar 3,318,447

kr 0

₨ 305,542

$ 39,898

K 25,208

GH₵ 25,794

¥ 799,501

$ 1,653,858

₱ 189,261

€ 5,708

₨ 1,228,259

ر.س 1,191

$ 82

R 361

JD 1,624

$ 145

د.إ 5,693

৳ 60,208

P 797

¥ 13,007

£ 3

Rp 167,775

₸ 359

Ar 2,762,572

₨ 251,190

$ 12,955

Liabilities

¥ 390,921

$ 8,103,602

₱ 66,985

€ 105,673

₨ 183,963

ر.س 0

$ 4

R 4

JD 5

SFr 400,000

$ 1,650,000

$ 717,712

kr 450,000

د.إ 5,890

৳ 1,175

P 0

¥ 26,140

£ 1

Rp 206,935

₸ 0

Ar 170,641

kr 0

₨ 3,588

$ 4,253

K 0

GH₵ 0

¥ 21,624,128

$ 8,321,335

₱ 125,431

€ 68,003

₨ 227,078

ر.س 44

$ 171

R 4

JD 5

SFr 400,004

$ 652,259

kr 449,002

د.إ 2,049

৳ 1,001

¥ 26,140

£ 2,327

Ar 319,581

kr 482

₨ 4,676

$ 10,586

Sensitivity analysis for Foreig

Sensitivity analysis for Foreign currency exchange rates (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Increase (decrease) of income before income tax
Disclosure of Sensitivity analysis for Foreign currency exchange rates [Line Items]
10% Increase		₩ (887,561)	₩ (844,122)
10% Decrease		887,561	844,122
Increase (decrease) of shareholder's equity
Disclosure of Sensitivity analysis for Foreign currency exchange rates [Line Items]
10% Increase	[1]	(887,561)	(844,122)
10% Decrease	[1]	₩ 887,561	₩ 844,122
[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, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of financial instruments by type of interest rate [Line Items]
Short-term borrowings	₩ 1,172,624	₩ 1,165,985
Long-term borrowings	3,258,015	2,434,624
Debt securities		51,146,783
Total	61,034,627	54,747,392	₩ 53,639,205
Floating interest rate [Member]
Disclosure of financial instruments by type of interest rate [Line Items]
Short-term borrowings	24,235	290,873
Long-term borrowings	2,358,860	1,743,252
Debt securities	0	685,700
Total	₩ 2,383,095	₩ 2,719,825

Sensitivity analysis for Intere

Sensitivity analysis for Interest rates (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Increase (decrease) of income before income tax
Disclosure of Sensitivity analysis for Interest rates [Line Items]
1% Increase		₩ (23,831)	₩ (27,198)
1% Decrease		23,831	27,198
Increase (decrease) of shareholder's equity
Disclosure of Sensitivity analysis for Interest rates [Line Items]
1% Increase	[1]	(23,831)	(27,198)
1% Decrease	[1]	₩ 23,831	₩ 27,198
[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, 2018	Dec. 31, 2017
Increase (decrease) of income before income tax
Disclosure of Sensitivity analysis for electricity rates [Line Items]
1% Increase		₩ 568,420	₩ 546,499
1% Decrease		(568,420)	(546,499)
Increase (decrease) of shareholder's equity
Disclosure of Sensitivity analysis for electricity rates [Line Items]
1% Increase	[1]	568,420	546,499
1% Decrease	[1]	₩ (568,420)	₩ (546,499)
[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, 2018	Dec. 31, 2017
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Borrowings and debt securities		₩ 72,934,694	₩ 62,723,018
Finance lease liabilities		381,742	556,276
Trade and other payables		9,063,285	8,804,741
Financial guarantee contracts	[1]	1,310,817	1,154,862
Non-derivative financial liabilities, undiscounted cash flows		83,690,538	73,238,897
Less than 1 year
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Borrowings and debt securities		10,204,471	10,748,437
Finance lease liabilities		87,709	174,534
Trade and other payables		6,348,195	5,867,729
Financial guarantee contracts	[1]	91,722	7,081
Non-derivative financial liabilities, undiscounted cash flows		16,732,097	16,797,781
1~2 Years
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Borrowings and debt securities		9,274,378	7,948,320
Finance lease liabilities		87,709	87,709
Trade and other payables		150,479	301,165
Financial guarantee contracts	[1]	855,488	18,054
Non-derivative financial liabilities, undiscounted cash flows		10,368,054	8,355,248
2~5 Years
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Borrowings and debt securities		28,143,311	21,331,394
Finance lease liabilities		141,074	185,284
Trade and other payables		375,661	698,289
Financial guarantee contracts	[1]	363,607	1,049,667
Non-derivative financial liabilities, undiscounted cash flows		29,023,653	23,264,634
More than 5 years
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Borrowings and debt securities		25,312,534	22,694,867
Finance lease liabilities		65,250	108,749
Trade and other payables		2,188,950	1,937,558
Financial guarantee contracts	[1]	0	80,060
Non-derivative financial liabilities, undiscounted cash flows		₩ 27,566,734	₩ 24,821,234
[1]	This represents the total guarantee amounts associated with the financial guarantee contracts. Financial guarantee liabilities which are recognized as of December 31, 2017 and 2018 are KRW23,475 million and KRW15,586 million, respectively.

Maturity analysis for non-der_2

Maturity analysis for non-derivative financial assets (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of maturity analysis for financial assets held for managing liquidity risk [Line Items]
Cash and cash equivalents		₩ 1,358,345	₩ 2,369,739	₩ 3,051,353	₩ 3,783,065
Available-for-sale financial assets			699,833	1,014,732
Equity investment at fair value through other comprehensive income		399,495
Held-to-maturity investments			3,144	₩ 3,244
Financial assets at amortised cost		14,042
Loans and receivables		758,378	946,430
Long-term/short-term financial instruments		2,318,027	2,244,514
Financial assets at fair value through profit or loss		920,935	111,512
Trade and other receivables		9,622,813	9,692,080
Financial assets held for managing liquidity risk		15,392,035	16,067,252
Less than 1 year
Disclosure of maturity analysis for financial assets held for managing liquidity risk [Line Items]
Cash and cash equivalents		1,358,345	2,369,739
Available-for-sale financial assets			0
Equity investment at fair value through other comprehensive income		0
Held-to-maturity investments			5
Financial assets at amortised cost		11,956
Loans and receivables		123,646	244,309
Long-term/short-term financial instruments		1,869,286	1,702,084
Financial assets at fair value through profit or loss		313,893	0
Trade and other receivables		7,795,619	7,930,715
Financial assets held for managing liquidity risk		11,472,745	12,246,852
1~5 Years
Disclosure of maturity analysis for financial assets held for managing liquidity risk [Line Items]
Cash and cash equivalents		0	0
Available-for-sale financial assets			0
Equity investment at fair value through other comprehensive income		0
Held-to-maturity investments			3,139
Financial assets at amortised cost		2,086
Loans and receivables		314,744	261,672
Long-term/short-term financial instruments		278,899	201,821
Financial assets at fair value through profit or loss		81,828	0
Trade and other receivables		1,067,800	920,539
Financial assets held for managing liquidity risk		1,745,357	1,387,171
More than 5 years
Disclosure of maturity analysis for financial assets held for managing liquidity risk [Line Items]
Cash and cash equivalents		0	0
Available-for-sale financial assets			214,156
Equity investment at fair value through other comprehensive income		0
Held-to-maturity investments			0
Financial assets at amortised cost		0
Loans and receivables		319,988	429,628
Long-term/short-term financial instruments		164,057	340,304
Financial assets at fair value through profit or loss		483,398	111,512
Trade and other receivables		701,743	788,795
Financial assets held for managing liquidity risk		1,669,186	1,884,395
Other
Disclosure of maturity analysis for financial assets held for managing liquidity risk [Line Items]
Cash and cash equivalents	[1]	0	0
Available-for-sale financial assets	[1]		485,677
Equity investment at fair value through other comprehensive income	[1]	399,495
Held-to-maturity investments	[1]		0
Financial assets at amortised cost	[1]	0
Loans and receivables	[1]	0	10,821
Long-term/short-term financial instruments	[1]	5,785	305
Financial assets at fair value through profit or loss	[1]	41,816	0
Trade and other receivables	[1]	57,651	52,031
Financial assets held for managing liquidity risk	[1]	₩ 504,747	₩ 548,834
[1]	The maturities cannot be presently determined.

Maturity analysis for derivativ

Maturity analysis for derivative financial liabilities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Derivative financial liabilities, undiscounted cash flows	₩ 83,336	₩ (376,587)
Net settlement | Not Designated as Hedging Instrument
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Derivative financial liabilities, undiscounted cash flows	0	(774)
Gross settlement | Not Designated as Hedging Instrument
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Derivative financial liabilities, undiscounted cash flows	90,706	(92,947)
Gross settlement | Designated as Hedging Instrument
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Derivative financial liabilities, undiscounted cash flows	(7,370)	(282,866)
Less than 1 year
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Derivative financial liabilities, undiscounted cash flows	10,888	(69,817)
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	0	(774)
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	5,734	(51,496)
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	5,154	(17,547)
1~2 Years
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Derivative financial liabilities, undiscounted cash flows	(26,882)	(48,864)
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	16,565	(19,887)
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	(43,447)	(28,977)
2~5 Years
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Derivative financial liabilities, undiscounted cash flows	100,123	(208,802)
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	28,283	(16,597)
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	71,840	(192,205)
More than 5 years
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Derivative financial liabilities, undiscounted cash flows	(793)	(49,104)
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	40,124	(4,967)
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	₩ (40,917)	₩ (44,137)

Fair value measurement of instr

Fair value measurement of instruments (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2018	Dec. 31, 2017
Financial assets, category | Assets recognized at fair value
Disclosure of fair value measurement of instruments [Line Items]
Book value		₩ 1,422,765	₩ 3,088,485
Fair value		1,422,765	3,088,485
Financial assets, category | Assets carried at amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		14,022,525	12,962,293
Fair value		14,022,525	12,962,293
Financial assets at fair value through other comprehensive income | Assets recognized at fair value
Disclosure of fair value measurement of instruments [Line Items]
Book value		399,495	0
Fair value		399,495	0
Available-for-sale financial assets | Assets recognized at fair value
Disclosure of fair value measurement of instruments [Line Items]
Book value	[1]	0	699,833
Fair value	[1]	0	699,833
Derivative Financial Instruments, Assets | Not Designated as Hedging Instrument | Assets recognized at fair value
Disclosure of fair value measurement of instruments [Line Items]
Book value		37,631	22,020
Fair value		37,631	22,020
Derivative Financial Instruments, Assets | Designated as Hedging Instrument | Assets recognized at fair value
Disclosure of fair value measurement of instruments [Line Items]
Book value		64,704	10,606
Fair value		64,704	10,606
Long-term financial instruments | Assets recognized at fair value
Disclosure of fair value measurement of instruments [Line Items]
Book value		0	542,430
Fair value		0	542,430
Long-term financial instruments | Assets carried at amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		448,741	0
Fair value		448,741	0
Short-term financial instruments | Assets recognized at fair value
Disclosure of fair value measurement of instruments [Line Items]
Book value		0	1,702,084
Fair value		0	1,702,084
Short-term financial instruments | Assets carried at amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		1,869,286	0
Fair value		1,869,286	0
Financial assets at fair value through profit or loss | Assets recognized at fair value
Disclosure of fair value measurement of instruments [Line Items]
Book value		920,935	111,512
Fair value		920,935	111,512
Financial assets at amortized cost | Assets carried at amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		14,042	0
Fair value		14,042	0
Held-to-maturity investments | Assets carried at amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		0	3,144
Fair value		0	3,144
Loans and receivables | Assets carried at amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		718,674	905,641
Fair value		718,674	905,641
Trade receivables | Assets carried at amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		9,613,437	9,683,769
Fair value		9,613,437	9,683,769
Cash and Cash Equivalents | Assets carried at amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		1,358,345	2,369,739
Fair value		1,358,345	2,369,739
Liabilities | Assets recognized at fair value
Disclosure of fair value measurement of instruments [Line Items]
Book value		312,163	428,059
Fair value		312,163	428,059
Liabilities | Assets carried at amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		70,381,718	63,970,393
Fair value		73,009,715	66,261,128
Derivative Financial Instruments, Liabilities | Not Designated as Hedging Instrument | Assets recognized at fair value
Disclosure of fair value measurement of instruments [Line Items]
Book value		99,010	150,929
Fair value		99,010	150,929
Derivative Financial Instruments, Liabilities | Designated as Hedging Instrument | Assets recognized at fair value
Disclosure of fair value measurement of instruments [Line Items]
Book value		213,153	277,130
Fair value		213,153	277,130
Secured borrowings | Assets carried at amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		741,029	1,055,554
Fair value		741,029	1,055,554
Unsecured bond | Assets carried at amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		56,603,988	51,146,783
Fair value		58,804,070	53,436,659
Finance lease liabilities | Assets carried at amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		283,806	418,260
Fair value		283,806	418,260
Unsecured borrowings | Assets carried at amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		3,522,602	2,476,196
Fair value		3,950,517	2,477,055
Trade and other payables | Assets carried at amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value	[2]	9,063,285	8,804,741
Fair value	[2]	9,063,285	8,804,741
Bank overdraft | Assets carried at amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		167,008	68,859
Fair value		₩ 167,008	₩ 68,859
[1]	Book value of equity securities held by the Company that were measured at cost as of December 31, 2017 is KRW37,926 million as a quoted market price does not exist in an active market and its fair value cannot be measured reliably.
[2]	Excludes finance lease liabilities.

Significant unobservable inputs

Significant unobservable inputs used in fair value measurement of liabilities (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Derivatives
Disclosure of significant unobservable inputs used in fair value measurement of liabilities [Line Items]
Interest rate, significant unobservable inputs, liabilities	0.02% ~ 4.16%	0.03% ~ 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	0.51% ~ 5.14%	0.08% ~ 4.38%
Finance lease
Disclosure of significant unobservable inputs used in fair value measurement of liabilities [Line Items]
Interest rate, significant unobservable inputs, liabilities	3.50% ~ 10.83%	9.00% ~ 10.83%

Fair value measurement of asset

Fair value measurement of assets (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of fair value measurement of assets [Line Items]
Financial assets at fair value through other comprehensive income	₩ 399,495	₩ 0
Available-for-sale financial assets		699,833	₩ 1,014,732
Financial assets at fair value through profit or loss	920,935	111,512
At fair value
Disclosure of fair value measurement of assets [Line Items]
Financial assets at fair value through other comprehensive income	399,495	0
Available-for-sale financial assets	0	661,907
Derivative assets	102,335	32,626
Financial assets at fair value through profit or loss	920,935	111,512
Total	1,422,765	806,045
At fair value | Level 1
Disclosure of fair value measurement of assets [Line Items]
Financial assets at fair value through other comprehensive income	210,056	0
Available-for-sale financial assets	0	274,453
Derivative assets	0	0
Financial assets at fair value through profit or loss	106,600	0
Total	316,656	274,453
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
Available-for-sale financial assets	0	214,156
Derivative assets	100,490	18,466
Financial assets at fair value through profit or loss	809,283	111,512
Total	909,773	344,134
At fair value | Level 3
Disclosure of fair value measurement of assets [Line Items]
Financial assets at fair value through other comprehensive income	189,439	0
Available-for-sale financial assets	0	173,298
Derivative assets	1,845	14,160
Financial assets at fair value through profit or loss	5,052	0
Total	₩ 196,336	₩ 187,458

Fair value measurement of liabi

Fair value measurement of liabilities (Details) - At fair value - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of fair value measurement of liabilities [Line Items]
Derivative liabilities	₩ 312,163	₩ 428,059
Level 2
Disclosure of fair value measurement of liabilities [Line Items]
Derivative liabilities	310,008	428,059
Level 3
Disclosure of fair value measurement of liabilities [Line Items]
Derivative liabilities	₩ 2,155	₩ 0

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, 2018	Dec. 31, 2017
Financial assets available-for-sale, category [Member]
Reconciliation of changes in fair value measurement, assets [Line Items]
Beginning balance	₩ 173,298	₩ 269,461
Changes in fair value measurement, assets
Effect of change in accounting policy	0	0
Acquisition	0	0
Reclassified category	0	(92,128)
Valuation	0	(6,201)
Disposal	0	0
Foreign currency translation	0	2,166
Ending balance	0	173,298
Financial assets at fair value through profit or loss, category [Member]
Reconciliation of changes in fair value measurement, assets [Line Items]
Beginning balance	0	0
Changes in fair value measurement, assets
Effect of change in accounting policy	5,038	0
Acquisition	0	0
Reclassified category	0	0
Valuation	14	0
Disposal	0	0
Foreign currency translation	0	0
Ending balance	5,052	0
Financial assets at fair value through other comprehensive income [Member]
Reconciliation of changes in fair value measurement, assets [Line Items]
Beginning balance	0	0
Changes in fair value measurement, assets
Effect of change in accounting policy	197,450	0
Acquisition	0	0
Reclassified category	0	0
Valuation	(11,744)	0
Disposal	(326)	0
Foreign currency translation	4,059	0
Ending balance	₩ 189,439	₩ 0

Service Concession Arrangemen_3

Service Concession Arrangements (Details) ₩ in Millions	12 Months Ended
	Dec. 31, 2018KRW (₩)
Disclosure of detailed information about service concession arrangements [Line Items]
Gas Complex - Thermal Power Plant at Ilijan, Philippines (BOT)	₩ 399,033
Hydroelectric Power Generation at Semangka, Indonesia (BOT)	679,301
Less than 1 year
Disclosure of detailed information about service concession arrangements [Line Items]
Gas Complex - Thermal Power Plant at Ilijan, Philippines (BOT)	116,790
Hydroelectric Power Generation at Semangka, Indonesia (BOT)	27,803
1~2 Years
Disclosure of detailed information about service concession arrangements [Line Items]
Gas Complex - Thermal Power Plant at Ilijan, Philippines (BOT)	116,790
Hydroelectric Power Generation at Semangka, Indonesia (BOT)	27,929
2~3 Years
Disclosure of detailed information about service concession arrangements [Line Items]
Gas Complex - Thermal Power Plant at Ilijan, Philippines (BOT)	116,790
Hydroelectric Power Generation at Semangka, Indonesia (BOT)	27,863
Over 3 years
Disclosure of detailed information about service concession arrangements [Line Items]
Gas Complex - Thermal Power Plant at Ilijan, Philippines (BOT)	48,663
Hydroelectric Power Generation at Semangka, Indonesia (BOT)	₩ 595,706

Transactions between related pa

Transactions between related parties (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Dongducheon Dream Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	₩ 6,093	₩ 17,041	₩ 15,221
Electricity purchase	828,547	813,440	946,463
Outstanding balances for related party transactions [Abstract]
Trade receivables	332	2,230
Trade payables	74,651	77,817
Non-trade receivables and others	298	655
Non-trade payables and others	10	0
Korea Gas Corporation
Disclosure of transactions between related parties [Line Items]
Electricity sales	99,933	88,011	89,030
Purchase of power generation fuel	5,191,243	3,245,519	3,633,198
Outstanding balances for related party transactions [Abstract]
Trade receivables	9,439	9,833
Trade payables	601,092	524,881
Non-trade receivables and others	498	339
Non-trade payables and others	314	569
Daegu Photovoltaic Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	128	349	0
REC purchase	3,745	3,646	3,243
Outstanding balances for related party transactions [Abstract]
Trade payables	83	71
Jeongam Wind Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	724	30	6
Outstanding balances for related party transactions [Abstract]
Trade receivables	151	0
Non-trade payables and others	2	4
Korea Power Engineering Service Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service sales	840	1,317	1,455
Service purchase	1,765	1,292	723
KS Solar Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	0	5	20
REC purchase	0	900	4,080
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	455	570	410
Korea Electric Power Industrial Development Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service sales	10,422	14,044	10,723
Electricity metering service fee	261,668	289,293	250,057
Outstanding balances for related party transactions [Abstract]
Trade receivables	278	333
Non-trade receivables and others	51	42
Non-trade payables and others	13,102	18,006
Goseong Green Energy Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	10,024	24,069	9,195
Outstanding balances for related party transactions [Abstract]
Non-trade receivables and others	0	19
Non-trade payables and others	43,020	7,140
Gangneung Eco Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service sales	4,928	2,391	5,223
Service purchase	19	0	0
Outstanding balances for related party transactions [Abstract]
Trade receivables	1	1
Non-trade receivables and others	99	4,747
Shin Pyeongtaek Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	8,468	9,025	3,579
Outstanding balances for related party transactions [Abstract]
Trade receivables	123	0
Non-trade receivables and others	242	210
Non-trade payables and others	82	52
Naepo Green Energy Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	160	185	104
Outstanding balances for related party transactions [Abstract]
Trade receivables	17	17
Noeul Green Energy Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	30	32	177
Service purchase	18,282	15,862	0
Outstanding balances for related party transactions [Abstract]
Trade receivables	3	3
Non-trade payables and others	8,774	2,041
Samcheok Eco Materials Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	605	237	64
Electricity purchase	3,819	14	0
Outstanding balances for related party transactions [Abstract]
Trade receivables	61	20
YTN Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	2,043	1,987	1,785
Advertisement fee	322	731	554
Outstanding balances for related party transactions [Abstract]
Trade receivables	98	98
Non-trade payables and others	11	209
Busan Green Energy Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	19	120	133
Service purchase	25,123	12,189	0
Outstanding balances for related party transactions [Abstract]
Trade receivables	1	7
Non-trade receivables and others	0	1,691
Non-trade payables and others	10,882	0
Gunsan Bio Energy Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	3,611	0	6
Outstanding balances for related party transactions [Abstract]
Non-trade receivables and others	3,458	0
Korea Electric Vehicle Charge Service
Disclosure of transactions between related parties [Line Items]
Electricity sales	578	700	89
Service purchase	605	1,093	0
Outstanding balances for related party transactions [Abstract]
Trade receivables	69	23
Trade payables	0	45
Non-trade receivables and others	354	0
Non-trade payables and others	56	0
Ulleungdo Natural Energy Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service sales	292	1,013	691
Electricity purchase	63	119	60
Tamra Offshore Wind Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	58	55	12
Electricity purchase	8,371	2,105	0
Daegu clean Energy Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	126	421	0
Outstanding balances for related party transactions [Abstract]
Non-trade receivables and others	17	0
Cheongna Energy Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service sales	11,688	7,980	6,831
Service purchase	58	59	73
Outstanding balances for related party transactions [Abstract]
Trade receivables	183	182
Non-trade payables and others	0	1
Gangwon Wind Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	2,402	994	1,273
Electricity purchase	25,407	25,968	22,780
Outstanding balances for related party transactions [Abstract]
Trade receivables	10	6
Trade payables	2,547	3,033
Gwangyang Green Energy Co., Ltd
Disclosure of transactions between related parties [Line Items]
Electricity sales	874	0	0
Hyundai Green Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Design service	14,031	14,280	14,835
Electricity purchase	480,815	458,378	469,547
Outstanding balances for related party transactions [Abstract]
Trade receivables	390	946
Trade payables	38,072	32,589
Korea Power Exchange
Disclosure of transactions between related parties [Line Items]
Service sales	6,854	8,446	7,141
Trading Fees	137,489	207,855	91,433
Outstanding balances for related party transactions [Abstract]
Trade receivables	847	463
Non-trade receivables and others	229	128
Non-trade payables and others	1,214	1,142
Hyundai Energy
Disclosure of transactions between related parties [Line Items]
Service sales	1,718	15,627	24,719
Electricity purchase	3,445	87,607	1,313
Outstanding balances for related party transactions [Abstract]
Trade receivables	57	49
Trade payables	259	223
Non-trade receivables and others	9,664	6,598
Non-trade payables and others	8,021	13,796
Taebaek Wind Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service sales	614	813	796
REC purchase	8,582	6,534	5,741
Outstanding balances for related party transactions [Abstract]
Trade receivables	0	116
Trade payables	453	533
Non-trade payables and others	291	121
Pyeongchang Wind Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Design service	1,166	1,176	497
Service purchase	6,994	4,033	1,594
Outstanding balances for related party transactions [Abstract]
Trade receivables	4	3
Non-trade payables and others	25	163
Daeryun Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	1,731	1,796	1,516
Electricity purchase	184,063	146,189	244,023
Outstanding balances for related party transactions [Abstract]
Trade receivables	178	162
Trade payables	15,845	15,706
Changjuk Wind Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	758	788	863
Electricity purchase	7,929	6,981	5,786
Outstanding balances for related party transactions [Abstract]
Trade receivables	0	101
Trade payables	455	515
Non-trade payables and others	273	546
KNH Solar Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	17	17	17
Electricity purchase	3,586	3,947	4,006
Outstanding balances for related party transactions [Abstract]
Trade receivables	1	1
Non-trade payables and others	0	193
S-Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service sales	9,118	12,852	5,994
Electricity purchase	507,875	457,329	437,206
Outstanding balances for related party transactions [Abstract]
Trade receivables	922	117
Trade payables	56,897	25,061
Non-trade receivables and others	34	5,183
Non-trade payables and others	16	0
PND solar., Ltd
Disclosure of transactions between related parties [Line Items]
Electricity sales	12	0	0
Outstanding balances for related party transactions [Abstract]
Trade receivables	3	0
Busan Solar
Disclosure of transactions between related parties [Line Items]
Electricity sales	0	0	8
Electricity purchase	0	0	1,079
Hadong Mineral Fiber Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service purchase	60	0	0
Green Biomass Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	0	0	2
Woodchip purchase	440	1,345	2,232
Outstanding balances for related party transactions [Abstract]
Non-trade payables and others	0	85
SPC Power Corporation
Disclosure of transactions between related parties [Line Items]
Dividend income	9,549	5,562	8,346
Outstanding balances for related party transactions [Abstract]
Non-trade receivables and others	73	76
YeongGwang Yaksu Wind Electric. Co., Ltd
Disclosure of transactions between related parties [Line Items]
Electricity purchase	2,437	0	0
Outstanding balances for related party transactions [Abstract]
Trade payables	2,679	0
Gemeng International Energy Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Dividend income	11,246	13,365	16,476
PT. Cirebon Electric Power
Disclosure of transactions between related parties [Line Items]
Dividend income	4,432	550	0
Dolphin Property Limited
Disclosure of transactions between related parties [Line Items]
Dividend income	0	0	35
PT. Bayan Resources TBK
Disclosure of transactions between related parties [Line Items]
Service sales	33,817	717	160
Nepal Water & Energy Development Company Private Limited
Disclosure of transactions between related parties [Line Items]
Service sales	536	900	375
Service purchase	31	72	0
Outstanding balances for related party transactions [Abstract]
Non-trade receivables and others	311	227
Pioneer Gas Power Limited
Disclosure of transactions between related parties [Line Items]
Rental income and others	26	62	164
Xe-Pian Xe-Namnoy Power
Disclosure of transactions between related parties [Line Items]
Service sales	672	661	773
Outstanding balances for related party transactions [Abstract]
Non-trade receivables and others	61	53
PT. Mutiara Jawa
Disclosure of transactions between related parties [Line Items]
Rental income and others	40	47	0
Outstanding balances for related party transactions [Abstract]
Non-trade receivables and others	10	0
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	1,022	1,131	768
Electricity purchase	287,008	252,024	263,797
Outstanding balances for related party transactions [Abstract]
Trade receivables	110	98
Trade payables	32,609	25,257
Non-trade receivables and others	12	10
KEPCO SPC Power Corporation
Disclosure of transactions between related parties [Line Items]
Service sales	43,141	45,005	10,344
Daejung Offshore Wind Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	1	1	1
KAPES, Inc.
Disclosure of transactions between related parties [Line Items]
Commission	648	1,420	1,176
Service purchase	77,758	164,165	140,555
Outstanding balances for related party transactions [Abstract]
Trade payables	0	55
Non-trade receivables and others	253	0
Non-trade payables and others	338	0
Dangjin Eco Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Technical fee	3,424	670	1,787
Outstanding balances for related party transactions [Abstract]
Non-trade receivables and others	18	1,211
Non-trade payables and others	0	41
Honam Wind Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	415	552	169
Electricity purchase	7,700	5,962	6,776
Outstanding balances for related party transactions [Abstract]
Trade payables	432	381
Non-trade payables and others	3,573	3,013
Seokmun Energy Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service sales	1,897	1,765	1,627
REC purchase	31,759	21,674	0
Outstanding balances for related party transactions [Abstract]
Trade receivables	39	93
Non-trade receivables and others	303	276
Non-trade payables and others	5,043	3,052
Incheon New Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Construction revenue	568	539	524
Outstanding balances for related party transactions [Abstract]
Trade receivables	128	128	128
KW Nuclear Components Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service sales	839	644	3,327
Outstanding balances for related party transactions [Abstract]
Trade receivables	4	4
Non-trade receivables and others	31	0
Chun-cheon Energy Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	2,471	4,855	3,079
REC purchase	320,954	194,136	0
Outstanding balances for related party transactions [Abstract]
Trade receivables	20	129
Trade payables	33,796	29,676
Non-trade receivables and others	308	252
Yeonggwangbaeksu Wind Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	1,540	1,654	1,591
Electricity purchase	11,366	11,124	11,208
Outstanding balances for related party transactions [Abstract]
Trade receivables	7	7
Trade payables	736	619
Non-trade receivables and others	0	144
Non-trade payables and others	789	1,300
Yeonggwang Wind Power Co., Ltd
Disclosure of transactions between related parties [Line Items]
Electricity sales	46	0	0
Outstanding balances for related party transactions [Abstract]
Trade receivables	10	0
KEPCO-Uhde Inc.
Disclosure of transactions between related parties [Line Items]
Service sales	17	34	6
Outstanding balances for related party transactions [Abstract]
Non-trade payables and others	4	4
GS Donghae Electric Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	7,238	11,204	12,994
Electricity purchase	780,233	351,367	903
Outstanding balances for related party transactions [Abstract]
Trade receivables	245	450
Trade payables	69,820	73,570
Non-trade receivables and others	2,537	1,892
Non-trade payables and others	59	0
Busan Shinho Solar Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	362	87	210
REC purchase	7,901	7,984	6,770
Outstanding balances for related party transactions [Abstract]
Trade receivables	2	2
Trade payables	175	159
Non-trade payables and others	717	811
Global Trade Of Power System Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service purchase	565	414	882
Datang Chifeng Renewable Power
Disclosure of transactions between related parties [Line Items]
Interest income	19,013	500	8,216
Outstanding balances for related party transactions [Abstract]
Non-trade receivables and others	0	82
Rabigh Electricity Company
Disclosure of transactions between related parties [Line Items]
Service sales	29,167	19,179	699
Rabigh Operation & Maintenance Company
Disclosure of transactions between related parties [Line Items]
Service sales	1,707	2,784	2,395
Outstanding balances for related party transactions [Abstract]
Non-trade receivables and others	449	869
Datang Chaoyang Renewable Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Dividend income	0	839	0
Shuweihat Asia Power Investment B.V.
Disclosure of transactions between related parties [Line Items]
Dividend income	499	1,707	2,957
Shuweihat Asia Operation & Maintenance Company
Disclosure of transactions between related parties [Line Items]
Service sales	1,046	1,319	1,179
Expressway Solar-light Power
Disclosure of transactions between related parties [Line Items]
Electricity purchase		2,941	2,942
Purchase of power generation fuel	3,513
ASM-BG Investicii AD
Disclosure of transactions between related parties [Line Items]
Service sales		1,062	322
Design service	1,153
Service purchase		0	0
Rental fee and others	1
Outstanding balances for related party transactions [Abstract]
Non-trade receivables and others		37
Non-trade payables and others	38
Jamaica Public Service Company Limited
Disclosure of transactions between related parties [Line Items]
Service sales		0	1,905
Design service	5,160
Service purchase		154	127
Rental fee and others	83
Outstanding balances for related party transactions [Abstract]
Trade receivables		0
Trade payables	594
Non-trade payables and others		0
Accrued interest income	24
KV Holdings, Inc.
Disclosure of transactions between related parties [Line Items]
Dividend income		0	302
Rental income and others	735
Datang KEPCO Chaoyang Renewable Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Dividend income		0	440
Rental income and others	0
Amman Asia Electric Power Company
Disclosure of transactions between related parties [Line Items]
Service sales		14,205	21,915
Design service	16,569
Outstanding balances for related party transactions [Abstract]
Trade receivables		2,675
Trade payables	0
Non-trade payables and others		0
Accrued interest income	18,351
Kelar S.A
Disclosure of transactions between related parties [Line Items]
Service sales		570	1,702
Design service	0
Nghi Son 2 Power LLC
Disclosure of transactions between related parties [Line Items]
Service sales		2,693	0
Design service	25,880
Barakah One Company
Disclosure of transactions between related parties [Line Items]
Service sales		7,059	25,244
Design service	7,777
Service purchase		2,631	0
Rental fee and others	1,145
Nawah Energy Company
Disclosure of transactions between related parties [Line Items]
Service sales		34,421	0
Design service	51,144
Outstanding balances for related party transactions [Abstract]
Trade receivables		10,419
Trade payables	29,614
Non-trade receivables and others		0
Non-trade payables and others	253
South Jamaica Power Company Limited
Disclosure of transactions between related parties [Line Items]
Service sales		0	0
Design service	152
Service purchase		0	0
Rental fee and others	67
RE Holiday Holdings LLC
Disclosure of transactions between related parties [Line Items]
Dividend income		0	0
Rental income and others	112
RE Pioneer Holdings LLC
Disclosure of transactions between related parties [Line Items]
Dividend income		0	0
Rental income and others	979
RE Barren Ridge 1 Holdings LLC
Disclosure of transactions between related parties [Line Items]
Dividend income		0	0
Rental income and others	1,114
RE Astoria 2 LandCo LLC
Disclosure of transactions between related parties [Line Items]
Dividend income		0	0
Rental income and others	504
RE Barren Ridge LandCo LLC
Disclosure of transactions between related parties [Line Items]
Dividend income		0	0
Rental income and others	202
Yeongwol Energy Station Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service sales		830	858
Design service	373
REC purchase		14,256	14,875
Service purchase	4,019
Outstanding balances for related party transactions [Abstract]
Trade receivables		7,068
Trade payables	0
DS POWER Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service sales		5,819	35,133
Design service	565
Outstanding balances for related party transactions [Abstract]
Trade receivables		340
Trade payables	0
Korea Development Bank
Disclosure of transactions between related parties [Line Items]
Electricity sales		3,239	3,102
Service sales	3,524
Dividend paid		418,407	654,829
Commission	166,876
Interest income		1,685	3,164
Interest expense	4,438	4,573	₩ 8,231
Electricity purchase	5,043
Outstanding balances for related party transactions [Abstract]
Non-trade receivables and others		501,029
Non-trade payables and others	12,125	200
Accrued interest income	218	204
Derivative assets	1,147	569
Derivative liabilities	₩ 27,306	₩ 22,398

Loans transactions between rela

Loans transactions between related parties (Details) ₩ in Millions	12 Months Ended
	Dec. 31, 2018KRW (₩)
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	₩ 126,255
Changes in Loans receivable transactions between related parties
Loans	7,664
Collection	(39,384)
Others	10,729
Ending balance	105,264
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	0
Collection	0
Others	0
Ending balance	9,396
KNOC Nigerian East & West Oil | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	26,341
Changes in Loans receivable transactions between related parties
Loans	229
Collection	0
Others	1,064
Ending balance	27,634
KNOC Nigerian East & West Oil | Accumulated impairment [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	(16,551)
Changes in Loans receivable transactions between related parties
Loans	0
Collection	4,072
Others	6,414
Ending balance	(6,065)
PT Wampu Electric Power | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	13,288
Changes in Loans receivable transactions between related parties
Loans	970
Collection	0
Others	622
Ending balance	14,880
PT. Cirebon Electric Power | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	15,436
Changes in Loans receivable transactions between related parties
Loans	1,283
Collection	(8,522)
Others	499
Ending balance	8,696
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	0
Collection	0
Others	0
Ending balance	1,413
Daehan Wind Power PSC | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	1,211
Changes in Loans receivable transactions between related parties
Loans	0
Collection	(606)
Others	(605)
Ending balance	0
Datang Chifeng Renewable Power | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	7,245
Changes in Loans receivable transactions between related parties
Loans	0
Collection	(7,440)
Others	195
Ending balance	0
Nghi Son 2 Power LLC | 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	4,566
Collection	(4,566)
Others	0
Ending balance	0
Kelar S.A | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	46,620
Changes in Loans receivable transactions between related parties
Loans	0
Collection	0
Others	2,074
Ending balance	48,694
KEPCO SPC Power Corporation | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	17,249
Changes in Loans receivable transactions between related parties
Loans	0
Collection	(17,715)
Others	466
Ending balance	0
KODE NOVUS II LLC | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	4,018
Changes in Loans receivable transactions between related parties
Loans	0	[1]
Collection	0	[1]
Others	0	[1]
Ending balance	4,018	[1]
KODE NOVUS II LLC | Accumulated impairment [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	(4,018)
Changes in Loans receivable transactions between related parties
Loans	0	[1]
Collection	0	[1]
Others	0	[1]
Ending balance	(4,018)	[1]
Chester Solar IV SpA | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	4,607
Changes in Loans receivable transactions between related parties
Loans	0
Collection	(4,607)
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	0
Changes in Loans receivable transactions between related parties
Loans	616
Collection	0
Others	0
Ending balance	₩ 616
[1]	The loans of KODE NOVUS II LLC is eliminated because the Company sold all of its shares of KODE NOVUS II LLC during the year ended December 31, 2018 as described in note 20.

Borrowings transactions between

Borrowings transactions between related parties (Details) - Korea Development Bank ₩ in Millions	12 Months Ended
	Dec. 31, 2018KRW (₩)
Facility
Disclosure of Borrowings transactions between related parties [Line Items]
Beginning balance	₩ 93,883
Changes in Borrowings transactions between related parties [Abstract]
Borrowings	1,200
Repayment	(28,290)
Others	0
Ending balance	66,793
Others
Disclosure of Borrowings transactions between related parties [Line Items]
Beginning balance	4,909
Changes in Borrowings transactions between related parties [Abstract]
Borrowings	0
Repayment	(755)
Others	0
Ending balance	4,154
Operating funds
Disclosure of Borrowings transactions between related parties [Line Items]
Beginning balance	61,000
Changes in Borrowings transactions between related parties [Abstract]
Borrowings	32,000
Repayment	(12,000)
Others	0
Ending balance	81,000
Syndicated Loan
Disclosure of Borrowings transactions between related parties [Line Items]
Beginning balance	16,301
Changes in Borrowings transactions between related parties [Abstract]
Borrowings	0
Repayment	(1,250)
Others	1,100
Ending balance	₩ 17,276

Guarantees provided between the

Guarantees provided between the related parties (Details) ر.س in Thousands, $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2018KRW (₩)		Dec. 31, 2018USD ($)		Dec. 31, 2018SAR (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 Operation & Maintenance Company		Shuweihat Asia Operation & Maintenance Company		Shuweihat Asia Operation & Maintenance Company
Name of Principal obligor	SAPCO		SAPCO		SAPCO
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 Operation & Maintenance Company Limited		Rabigh Operation & Maintenance Company Limited		Rabigh Operation & Maintenance Company Limited
Name of Principal obligor	RABEC		RABEC		RABEC
Amount of guarantees | $			$ 1,387
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	Barakah One Company		Barakah One Company		Barakah One Company
Name of Principal obligor	Export-Import Bank of Korea and others		Export-Import Bank of Korea and others		Export-Import Bank of Korea and others
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	Barakah One Company		Barakah One Company		Barakah One Company
Name of Principal obligor	Export-Import Bank of Korea and others		Export-Import Bank of Korea and others		Export-Import Bank of Korea and others
Amount of guarantees | $			$ 3,404,275
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	RE Holiday Holdings LLC		RE Holiday Holdings LLC		RE Holiday Holdings LLC
Name of Principal obligor	EPS Renewables Holdings, LLC, Santander Bank and others		EPS Renewables Holdings, LLC, Santander Bank and others		EPS Renewables Holdings, LLC, Santander Bank and others
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	RE Pioneer Holdings LLC		RE Pioneer Holdings LLC		RE Pioneer Holdings LLC
Name of Principal obligor	EPS Renewables Holdings, LLC, Santander Bank and others		EPS Renewables Holdings, LLC, Santander Bank and others		EPS Renewables Holdings, LLC, Santander Bank and others
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	RE Barren Ridge 1 Holdings LLC		RE Barren Ridge 1 Holdings LLC		RE Barren Ridge 1 Holdings LLC
Name of Principal obligor	Firstar Development, LLC, Santander Bank and others		Firstar Development, LLC, Santander Bank and others		Firstar Development, LLC, Santander Bank and others
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	Nghi Son 2 Power LLC		Nghi Son 2 Power LLC		Nghi Son 2 Power LLC
Name of Principal obligor	SMBC Ho Chi Minh		SMBC Ho Chi Minh		SMBC Ho Chi Minh
Amount of guarantees | $			$ 28,000
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	Cheongna Energy Co., Ltd.		Cheongna Energy Co., Ltd.		Cheongna Energy Co., Ltd.
Name of Principal obligor	KEB Hana Bank and others		KEB Hana Bank and others		KEB Hana Bank and others
Amount of guarantees	₩ 3,465
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	Cheongna Energy Co., Ltd.	[1]	Cheongna Energy Co., Ltd.	[1]	Cheongna Energy Co., Ltd.	[1]
Name of Principal obligor	KEB Hana Bank and others	[1]	KEB Hana Bank and others	[1]	KEB Hana Bank and others	[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	Xe-Pian Xe-Namnoy Power Co., Ltd.		Xe-Pian Xe-Namnoy Power Co., Ltd.		Xe-Pian Xe-Namnoy Power Co., Ltd.
Name of Principal obligor	Krung Thai Bank		Krung Thai Bank		Krung Thai Bank
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	Xe-Pian Xe-Namnoy Power Co., Ltd.		Xe-Pian Xe-Namnoy Power Co., Ltd.		Xe-Pian Xe-Namnoy Power Co., Ltd.
Name of Principal obligor	Krung Thai Bank		Krung Thai Bank		Krung Thai Bank
Amount of guarantees	₩ 77,165
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	Xe-Pian Xe-Namnoy Power Co., Ltd.		Xe-Pian Xe-Namnoy Power Co., Ltd.		Xe-Pian Xe-Namnoy Power Co., Ltd.
Name of Principal obligor	SK E&C		SK E&C		SK E&C
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	Rabigh Operation & Maintenance Company Limited		Rabigh Operation & Maintenance Company Limited		Rabigh Operation & Maintenance Company Limited
Name of Principal obligor	Saudi Arabia British Bank		Saudi Arabia British Bank		Saudi Arabia British Bank
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	Daegu Photovoltaic Co., Ltd.		Daegu Photovoltaic Co., Ltd.		Daegu Photovoltaic Co., Ltd.
Name of Principal obligor	Korea Development Bank		Korea Development Bank		Korea Development Bank
Amount of guarantees	₩ 2,002
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	Dongducheon Dream Power Co., Ltd.	[2]	Dongducheon Dream Power Co., Ltd.	[2]	Dongducheon Dream Power Co., Ltd.	[2]
Name of Principal obligor	Kookmin Bank and others	[2]	Kookmin Bank and others	[2]	Kookmin Bank and others	[2]
Amount of guarantees	₩ 41,389	[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	Dongducheon Dream Power Co., Ltd.		Dongducheon Dream Power Co., Ltd.		Dongducheon Dream Power Co., Ltd.
Name of Principal obligor	BNK Securities and others		BNK Securities and others		BNK Securities and others
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	PT. Mutiara Jawa		PT. Mutiara Jawa		PT. Mutiara Jawa
Name of Principal obligor	Woori Bank		Woori Bank		Woori Bank
Amount of guarantees	₩ 365
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	Heang Bok Do Si Photovoltaic Power Co., Ltd.		Heang Bok Do Si Photovoltaic Power Co., Ltd.		Heang Bok Do Si Photovoltaic Power Co., Ltd.
Name of Principal obligor	Nonghyup Bank		Nonghyup Bank		Nonghyup Bank
Amount of guarantees	₩ 202
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	Shin Pyeongtaek Power Co., Ltd.		Shin Pyeongtaek Power Co., Ltd.		Shin Pyeongtaek Power Co., Ltd.
Name of Principal obligor	Kookmin Bank		Kookmin Bank		Kookmin Bank
Amount of guarantees	₩ 67,600
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	Shin Pyeongtaek Power Co.,Ltd.	[1]	Shin Pyeongtaek Power Co.,Ltd.	[1]	Shin Pyeongtaek Power Co.,Ltd.	[1]
Name of Principal obligor	Kookmin Bank	[1]	Kookmin Bank	[1]	Kookmin Bank	[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	Busan Shinho Solar Power Co., Ltd.		Busan Shinho Solar Power Co., Ltd.		Busan Shinho Solar Power Co., Ltd.
Name of Principal obligor	Korea Development Bank and others		Korea Development Bank and others		Korea Development Bank and others
Amount of guarantees	₩ 4,761
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	Seokmun Energy Co., Ltd.		Seokmun Energy Co., Ltd.		Seokmun Energy Co., Ltd.
Name of Principal obligor	Kookmin Bank and others		Kookmin Bank and others		Kookmin Bank and others
Amount of guarantees	₩ 16,751
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	Chun-cheon Energy Co., Ltd.		Chun-cheon Energy Co., Ltd.		Chun-cheon Energy Co., Ltd.
Name of Principal obligor	Kookmin Bank and others		Kookmin Bank and others		Kookmin Bank and others
Amount of guarantees	₩ 42,505
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	Chun-cheon Energy Co., Ltd.	[1]	Chun-cheon Energy Co., Ltd.	[1]	Chun-cheon Energy Co., Ltd.	[1]
Name of Principal obligor	Kookmin Bank and others	[1]	Kookmin Bank and others	[1]	Kookmin Bank and others	[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	Honam Wind Power Co., Ltd.		Honam Wind Power Co., Ltd.		Honam Wind Power Co., Ltd.
Name of Principal obligor	Shinhan Bank and others		Shinhan Bank and others		Shinhan Bank and others
Amount of guarantees	₩ 4,860
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	GS Donghae Electric Power Co., Ltd.		GS Donghae Electric Power Co., Ltd.		GS Donghae Electric Power Co., Ltd.
Name of Principal obligor	Korea Development Bank and others		Korea Development Bank and others		Korea Development Bank and others
Amount of guarantees	₩ 240,591
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	Yeonggwangbaeksu Wind Power Co., Ltd.		Yeonggwangbaeksu Wind Power Co., Ltd.		Yeonggwangbaeksu Wind Power Co., Ltd.
Name of Principal obligor	Kookmin Bank and others		Kookmin Bank and others		Kookmin Bank and others
Amount of guarantees	₩ 2,843
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	Yeonggwang Wind Power Co., Ltd.		Yeonggwang Wind Power Co., Ltd.		Yeonggwang Wind Power Co., Ltd.
Name of Principal obligor	KDB Capital Corporation and others		KDB Capital Corporation and others		KDB Capital Corporation and others
Amount of guarantees	₩ 15,304
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	Daesan Green Energy Co., Ltd.		Daesan Green Energy Co., Ltd.		Daesan Green Energy Co., Ltd.
Name of Principal obligor	IBK		IBK		IBK
Amount of guarantees	₩ 17,433
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	Taebaek Gadeoksan Wind Power Co., Ltd.		Taebaek Gadeoksan Wind Power Co., Ltd.		Taebaek Gadeoksan Wind Power Co., Ltd.
Name of Principal obligor	Samsung Fire & Marine Insurance Co., Ltd. and others		Samsung Fire & Marine Insurance Co., Ltd. and others		Samsung Fire & Marine Insurance Co., Ltd. and others
Amount of guarantees	₩ 8,508
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	PT. Tanjung Power Indonesia		PT. Tanjung Power Indonesia		PT. Tanjung Power Indonesia
Name of Principal obligor	MUFG Bank, Ltd.(MUFG) (formerly, the Bank of Tokyo Mitsubishi UFJ, Ltd.(BTMU)) and others		MUFG Bank, Ltd.(MUFG) (formerly, the Bank of Tokyo Mitsubishi UFJ, Ltd.(BTMU)) and others		MUFG Bank, Ltd.(MUFG) (formerly, the Bank of Tokyo Mitsubishi UFJ, Ltd.(BTMU)) and others
Amount of guarantees | $			$ 46,983
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. Tanjung Power Indonesia		PT. Tanjung Power Indonesia		PT. Tanjung Power Indonesia
Name of Principal obligor	PT Adaro Indonesia		PT Adaro Indonesia		PT Adaro Indonesia
Amount of guarantees | $			$ 3,150
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	South Jamaica Power Company Limited		South Jamaica Power Company Limited		South Jamaica Power Company Limited
Name of Principal obligor	Societe Generale		Societe Generale		Societe Generale
Amount of guarantees | $			$ 14,400
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	South Jamaica Power Company Limited	[1],[3]	South Jamaica Power Company Limited	[1],[3]	South Jamaica Power Company Limited	[1],[3]
Name of Principal obligor	JCSD Trustee Services Limited and others	[1],[3]	JCSD Trustee Services Limited and others	[1],[3]	JCSD Trustee Services Limited and others	[1],[3]
Amount of guarantees | $			$ 18,350	[1],[3]
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	KNH Solar Co., Ltd.		KNH Solar Co., Ltd.		KNH Solar Co., Ltd.
Name of Principal obligor	Shinhan Bank and Kyobo Life Insurance Co., Ltd.		Shinhan Bank and Kyobo Life Insurance Co., Ltd.		Shinhan Bank and Kyobo Life Insurance Co., Ltd.
Amount of guarantees	₩ 2,337
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	KNH Solar Co., Ltd.	[1]	KNH Solar Co., Ltd.	[1]	KNH Solar Co., Ltd.	[1]
Name of Principal obligor	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]
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	Daeryun Power Co., Ltd.		Daeryun Power Co., Ltd.		Daeryun Power Co., Ltd.
Name of Principal obligor	Korea Development Bank and others		Korea Development Bank and others		Korea Development Bank and others
Amount of guarantees	₩ 26,099
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	Daeryun Power Co., Ltd.	[1]	Daeryun Power Co., Ltd.	[1]	Daeryun Power Co., Ltd.	[1]
Name of Principal obligor	Korea Development Bank and others	[1]	Korea Development Bank and others	[1]	Korea Development Bank and others	[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	Changjuk Wind Power Co., Ltd.		Changjuk Wind Power Co., Ltd.		Changjuk Wind Power Co., Ltd.
Name of Principal obligor	Shinhan Bank		Shinhan Bank		Shinhan Bank
Amount of guarantees	₩ 8,086
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	Changjuk Wind Power Co., Ltd.	[1]	Changjuk Wind Power Co., Ltd.	[1]	Changjuk Wind Power Co., Ltd.	[1]
Name of Principal obligor	Shinhan Bank	[1]	Shinhan Bank	[1]	Shinhan Bank	[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	Daegu Green Power Co., Ltd.		Daegu Green Power Co., Ltd.		Daegu Green Power Co., Ltd.
Name of Principal obligor	Shinhan Bank and others		Shinhan Bank and others		Shinhan Bank and others
Amount of guarantees	₩ 41,110
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	Kelar S.A		Kelar S.A		Kelar S.A
Name of Principal obligor	KEB Hana Bank, SMBC, Mizuho Bank, MUFG, Natixis		KEB Hana Bank, SMBC, Mizuho Bank, MUFG, Natixis		KEB Hana Bank, SMBC, Mizuho Bank, MUFG, Natixis
Amount of guarantees | $			$ 63,707
Debt 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	Daehan Wind Power PSC		Daehan Wind Power PSC		Daehan Wind Power PSC
Name of Principal obligor	Shinhan Bank		Shinhan Bank		Shinhan Bank
Amount of guarantees | $			$ 18,200
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	Daehan Wind Power PSC		Daehan Wind Power PSC		Daehan Wind Power PSC
Name of Principal obligor	Shinhan Bank		Shinhan Bank		Shinhan Bank
Amount of guarantees | $			$ 3,000
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	Daehan Wind Power PSC	[1]	Daehan Wind Power PSC	[1]	Daehan Wind Power PSC	[1]
Name of Principal obligor	Shinhan Bank	[1]	Shinhan Bank	[1]	Shinhan Bank	[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	Pyeongchang Wind Power Co., Ltd.		Pyeongchang Wind Power Co., Ltd.		Pyeongchang Wind Power Co., Ltd.
Name of Principal obligor	Woori Bank and Shinhan Bank and others		Woori Bank and Shinhan Bank and others		Woori Bank and Shinhan Bank and others
Amount of guarantees	₩ 5,419
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	Pyeongchang Wind Power Co., Ltd.		Pyeongchang Wind Power Co., Ltd.		Pyeongchang Wind Power Co., Ltd.
Name of Principal obligor	Woori Bank and Shinhan Bank and others		Woori Bank and Shinhan Bank and others		Woori Bank and Shinhan Bank and others
Amount of guarantees	₩ 0
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	Taebaek Wind Power Co., Ltd.	[1]	Taebaek Wind Power Co., Ltd.	[1]	Taebaek Wind Power Co., Ltd.	[1]
Name of Principal obligor	Shinhan Bank and others	[1]	Shinhan Bank and others	[1]	Shinhan Bank and others	[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	Jeongam Wind Power Co., Ltd.		Jeongam Wind Power Co., Ltd.		Jeongam Wind Power Co., Ltd.
Name of Principal obligor	IBK, SK Securities Co., Ltd. and others		IBK, SK Securities Co., Ltd. and others		IBK, SK Securities Co., Ltd. and others
Amount of guarantees	₩ 4,589
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	Jeongam Wind Power Co., Ltd.		Jeongam Wind Power Co., Ltd.		Jeongam Wind Power Co., Ltd.
Name of Principal obligor	IBK, SK Securities Co., Ltd. and others		IBK, SK Securities Co., Ltd. and others		IBK, SK Securities Co., Ltd. and others
Amount of guarantees	₩ 0
Payment 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	Samcheok Eco Materials Co., Ltd.	[4]	Samcheok Eco Materials Co., Ltd.	[4]	Samcheok Eco Materials Co., Ltd.	[4]
Name of Principal obligor	SEM Investment Co., Ltd.	[4]	SEM Investment Co., Ltd.	[4]	SEM Investment Co., Ltd.	[4]
Amount of guarantees	₩ 0	[4]
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	Hyundai Green Power Co., Ltd.		Hyundai Green Power Co., Ltd.		Hyundai Green Power Co., Ltd.
Name of Principal obligor	Korea Development Bank and others		Korea Development Bank and others		Korea Development Bank and others
Amount of guarantees	₩ 127,160
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	PT. Cirebon Electric Power		PT. Cirebon Electric Power		PT. Cirebon Electric Power
Name of Principal obligor	Mizuho Bank		Mizuho Bank		Mizuho Bank
Amount of guarantees | $			$ 11,825
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	PT Wampu Electric Power		PT Wampu Electric Power		PT Wampu Electric Power
Name of Principal obligor	SMBC		SMBC		SMBC
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	YaksuESS Co., Ltd		YaksuESS Co., Ltd		YaksuESS Co., Ltd
Name of Principal obligor	Hanwha Life Insurance Co., Ltd.		Hanwha Life Insurance Co., Ltd.		Hanwha Life Insurance Co., Ltd.
Amount of guarantees	₩ 460
Guarantees for supplemental funding
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	YaksuESS Co., Ltd	[1]	YaksuESS Co., Ltd	[1]	YaksuESS Co., Ltd	[1]
Name of Principal obligor	Hanwha Life Insurance Co., Ltd.	[1]	Hanwha Life Insurance Co., Ltd.	[1]	Hanwha Life Insurance 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	YeongGwang Yaksu Wind Electric. Co., Ltd		YeongGwang Yaksu Wind Electric. Co., Ltd		YeongGwang Yaksu Wind Electric. Co., Ltd
Name of Principal obligor	Hanwha Life Insurance Co., Ltd. and others		Hanwha Life Insurance Co., Ltd. and others		Hanwha Life Insurance Co., Ltd. and others
Amount of guarantees	₩ 533
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea South-East Power Co., Ltd.	[5]	Korea South-East Power Co., Ltd.	[5]	Korea South-East Power Co., Ltd.	[5]
Name of Guarantee	Hyundai Energy Co., Ltd.	[5]	Hyundai Energy Co., Ltd.	[5]	Hyundai Energy Co., Ltd.	[5]
Name of Principal obligor	Korea Development Bank and others	[5]	Korea Development Bank and others	[5]	Korea Development Bank and others	[5]
Amount of guarantees	₩ 0	[5]
Performance guarantees and 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],[6]	Korea South-East Power Co., Ltd.	[1],[6]	Korea South-East Power Co., Ltd.	[1],[6]
Name of Guarantee	Hyundai Energy Co., Ltd.	[1],[6]	Hyundai Energy Co., Ltd.	[1],[6]	Hyundai Energy Co., Ltd.	[1],[6]
Name of Principal obligor	Korea Development Bank and others	[1],[6]	Korea Development Bank and others	[1],[6]	Korea Development Bank and others	[1],[6]
Amount of guarantees	₩ 78,600	[1],[6]
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	RES Technology AD		RES Technology AD		RES Technology AD
Name of Principal obligor	UniCredit Bulbank and others		UniCredit Bulbank and others		UniCredit Bulbank and others
Amount of guarantees	₩ 15,209
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	ASM-BG Investicii AD		ASM-BG Investicii AD		ASM-BG Investicii AD
Name of Principal obligor	UniCredit Bulbank and others		UniCredit Bulbank and others		UniCredit Bulbank and others
Amount of guarantees	₩ 21,379
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],[7]	Korea South-East Power Co., Ltd.	[1],[7]	Korea South-East Power Co., Ltd.	[1],[7]
Name of Guarantee	Expressway Solar-light Power Generation Co., Ltd.	[1],[7]	Expressway Solar-light Power Generation Co., Ltd.	[1],[7]	Expressway Solar-light Power Generation Co., Ltd.	[1],[7]
Name of Principal obligor	Woori Bank	[1],[7]	Woori Bank	[1],[7]	Woori Bank	[1],[7]
Amount of guarantees	₩ 2,500	[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	S-Power Co., Ltd.		S-Power Co., Ltd.		S-Power Co., Ltd.
Name of Principal obligor	Korea Development Bank and others		Korea Development Bank and others		Korea Development Bank and others
Amount of guarantees	₩ 114,566
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	Goseong Green Energy Co., Ltd.		Goseong Green Energy Co., Ltd.		Goseong Green Energy Co., Ltd.
Name of Principal obligor	Kyobo Life Insurance Co., Ltd. and others		Kyobo Life Insurance Co., Ltd. and others		Kyobo Life Insurance Co., Ltd. and others
Amount of guarantees	₩ 2,459
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	Gangneung Eco Power Co., Ltd.		Gangneung Eco Power Co., Ltd.		Gangneung Eco Power Co., Ltd.
Name of Principal obligor	Kyobo Life Insurance Co., Ltd. and others		Kyobo Life Insurance Co., Ltd. and others		Kyobo Life Insurance Co., Ltd. and others
Amount of guarantees	₩ 2,495
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	PND solar., Ltd.		PND solar., Ltd.		PND solar., Ltd.
Name of Principal obligor	IBK and others		IBK and others		IBK and others
Amount of guarantees	₩ 1,020
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	Tamra Offshore Wind Power Co., Ltd.		Tamra Offshore Wind Power Co., Ltd.		Tamra Offshore Wind Power Co., Ltd.
Name of Principal obligor	Nonghyup Life Insurance Co., Ltd. and others		Nonghyup Life Insurance Co., Ltd. and others		Nonghyup Life Insurance Co., Ltd. and others
Amount of guarantees	₩ 10,401
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	Hyundai Eco Energy Co., Ltd.		Hyundai Eco Energy Co., Ltd.		Hyundai Eco Energy Co., Ltd.
Name of Principal obligor	Samsung Life Insurance and others		Samsung Life Insurance and others		Samsung Life Insurance and others
Amount of guarantees	₩ 3,388
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	Noeul Green Energy Co., Ltd.		Noeul Green Energy Co., Ltd.		Noeul Green Energy Co., Ltd.
Name of Principal obligor	KEB Hana Bank and others		KEB Hana Bank and others		KEB Hana Bank and others
Amount of guarantees	₩ 8,016
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	Busan Green Energy Co., Ltd.		Busan Green Energy Co., Ltd.		Busan Green Energy Co., Ltd.
Name of Principal obligor	Shinhan Bank and others		Shinhan Bank and others		Shinhan Bank and others
Amount of guarantees	₩ 12,537
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	KEPCO Plant Service & Engineering Co., Ltd.		KEPCO Plant Service & Engineering Co., Ltd.		KEPCO Plant Service & Engineering Co., Ltd.
Name of Guarantee	Incheon New Power Co., Ltd.		Incheon New Power Co., Ltd.		Incheon New Power Co., Ltd.
Name of Principal obligor	Shinhan Bank		Shinhan Bank		Shinhan Bank
Amount of guarantees	₩ 579
Guarantees for supplemental funding and others
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	Incheon New Power Co., Ltd.	[1]	Incheon New Power Co., Ltd.	[1]	Incheon New Power Co., Ltd.	[1]
Name of Principal obligor	Shinhan Bank	[1]	Shinhan Bank	[1]	Shinhan Bank	[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 14,730 thousand and the total amount of guarantees is USD 8,257.5 thousand which consists of USD 3,670 thousand of EWP (Barbados) 1 SRL's contribution obligation and USD 4,587.5 thousand of South Jamaica Energy Holding Limited's portion (50%) of contribution obligation.
[4]	The Company has the obligation 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. In relation to this guarantee, the Company has recognized KRW2,155 million of derivative liabilities as of December 31, 2018.
[5]	The Company recognized 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 KRW47,067 million
[6]	Pursuant to the guarantee agreement, the Company recognized other provisions of KRW40,898 million as the possibility of economic outflow to fulfill the obligation was probable and the amount could be reasonably estimated.
[7]	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.

Derivatives transactions betwee

Derivatives transactions between related parties (Details) - 12 months ended Dec. 31, 2018 - Korea Development Bank $ in Thousands, ₩ in Millions	KRW (₩)	USD ($)
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2016~2019	2016~2019
Pay, Contract Amount | ₩	₩ 105,260
Receive, Contract Amount | $		$ 100,000
Contract Interest rate Pay	2.48%	2.48%
Contract Interest rate Receive	2.38%	2.38%
Contract exchange rate	1,052.6	1,052.6
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2015~2025	2015~2025
Pay, Contract Amount | ₩	₩ 111,190
Receive, Contract Amount | $		$ 100,000
Contract Interest rate Pay	2.62%	2.62%
Contract Interest rate Receive	3.25%	3.25%
Contract exchange rate	1,111.9	1,111.9
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2017~2022	2017~2022
Pay, Contract Amount | ₩	₩ 111,610
Receive, Contract Amount | $		$ 100,000
Contract Interest rate Pay	2.31%	2.31%
Contract Interest rate Receive	3.13%	3.13%
Contract exchange rate	1,116.1	1,116.1
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2017~2020	2017~2020
Pay, Contract Amount | ₩	₩ 114,580
Receive, Contract Amount | $		$ 100,000
Contract Interest rate Pay	1.75%	1.75%
Contract Interest rate Receive	2.38%	2.38%
Contract exchange rate	1,145.8	1,145.8
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2016~2021	2016~2021
Pay, Contract Amount | ₩	₩ 121,000
Receive, Contract Amount | $		$ 100,000
Contract Interest rate Pay	2.15%	2.15%
Contract Interest rate Receive	2.50%	2.50%
Contract exchange rate	1,210	1,210
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2017~2022	2017~2022
Pay, Contract Amount | ₩	₩ 113,300
Receive, Contract Amount | $		$ 100,000
Contract Interest rate Pay	19.4%	19.4%
Contract Interest rate Receive	2.63%	2.63%
Contract exchange rate	1,133	1,133
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2018~2028	2018~2028
Pay, Contract Amount | ₩	₩ 108,600
Receive, Contract Amount | $		$ 800,000
Contract Interest rate Pay	2.69%	2.69%
Contract Interest rate Receive	3.35%	3.35%
Contract exchange rate	135.75	135.75
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2018~2023	2018~2023
Pay, Contract Amount | ₩	₩ 170,280
Receive, Contract Amount | $		$ 150,000
Contract Interest rate Pay	2.15%	2.15%
Contract Interest rate Receive	3.75%	3.75%
Contract exchange rate	1,135.2	1,135.2
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2018~2023	2018~2023
Pay, Contract Amount | ₩	₩ 320,880
Receive, Contract Amount | $		$ 300,000
Contract Interest rate Pay	2.03%	2.03%
Contract Interest rate Receive	3.75%	3.75%
Contract exchange rate	1,069.6	1,069.6
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2018~2021	2018~2021
Pay, Contract Amount | ₩	₩ 212,960
Receive, Contract Amount | $		$ 200,000
Contract Interest rate Pay	2.10%	2.10%
Contract Interest rate Receive	3.00%	3.00%
Contract exchange rate	1,064.8	1,064.8
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2018~2021	2018~2021
Pay, Contract Amount | ₩	₩ 169,335
Receive, Contract Amount | $		$ 150,000
Contract Interest rate Pay	2.26%	2.26%
Contract Interest rate Receive	3.88%	3.88%
Contract exchange rate	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
Contract date	Dec. 27, 2017	Dec. 27, 2017
Matrurity date	Jul. 12, 2021	Jul. 12, 2021
Cross Currency Forward Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Pay, Contract Amount | ₩	₩ 11,279
Receive, Contract Amount | $		$ 10,000
Contract exchange rate	1,127.85	1,127.85
Contract date	Dec. 18, 2018	Dec. 18, 2018
Matrurity date	Jan. 22, 2019	Jan. 22, 2019
Cross Currency Forward Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Pay, Contract Amount | ₩	₩ 4,490
Receive, Contract Amount | $		$ 4,000
Contract exchange rate	1,122.6	1,122.6
Contract date	Dec. 13, 2018	Dec. 13, 2018
Matrurity date	Jan. 10, 2019	Jan. 10, 2019
Cross Currency Forward Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Pay, Contract Amount | ₩	₩ 13,497
Receive, Contract Amount | $		$ 12,000
Contract exchange rate	1,124.74	1,124.74
Contract date	Dec. 24, 2018	Dec. 24, 2018
Matrurity date	Jan. 10, 2019	Jan. 10, 2019
Cross Currency Forward Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Pay, Contract Amount | ₩	₩ 10,103
Receive, Contract Amount | $		$ 9,000
Contract exchange rate	1,122.5	1,122.5
Contract date	Dec. 21, 2018	Dec. 21, 2018
Matrurity date	Jan. 15, 2019	Jan. 15, 2019
Cross Currency Forward Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Pay, Contract Amount | ₩	₩ 11,207
Receive, Contract Amount | $		$ 10,000
Contract exchange rate	1,120.68	1,120.68
Contract date	Dec. 27, 2018	Dec. 27, 2018
Matrurity date	Jan. 23, 2019	Jan. 23, 2019
Cross Currency Forward Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Pay, Contract Amount | ₩	₩ 13,412
Receive, Contract Amount | $		$ 12,000
Contract exchange rate	1,117.64	1,117.64
Contract date	Dec. 28, 2018	Dec. 28, 2018
Matrurity date	Jan. 23, 2019	Jan. 23, 2019

Key management personnel compen

Key management personnel compensation (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of Key management personnel compensation [Abstract]
Salaries	₩ 1,106	₩ 1,271	₩ 1,463
Employee benefits	24	54	33
Total	₩ 1,130	₩ 1,325	₩ 1,496

Significant non-cash investing

Significant non-cash investing and financing transactions (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Non-Cash Transactions [Abstract]
Transfer from construction-in-progress to other assets	₩ 8,656,252	₩ 13,676,233	₩ 19,971,599
Recognition of asset retirement cost and related provision for decommissioning costs	310,272	2,494,802	470,941
Transfer from provision for disposal of spent nuclear fuel to accrued expenses	₩ 482,699	₩ 342,861	₩ 283,675

Commitments for Expenditure (De

Commitments for Expenditure (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2018	Dec. 31, 2017
Purchase of switch (25.8kV Eco) 12,450
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts		₩ 50,526	₩ 50,526
Commitments for Expenditure balance		0	35,494
Purchase of cable (PVC,1C,2000SQ) 153,000M and others (Shin-Bupyung-Youngseo)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts		56,183	50,256
Commitments for Expenditure balance		37,309	42,857
Purchase of cable (PVC, 1C, 2500SQ) 103,374M and others (Bukdangjin-Shintangjung)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts		44,315	42,500
Commitments for Expenditure balance		31,801	29,987
Purchase of GIS (362KV 6300A 63KA) 23CB - YoungseoS/S
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts		34,500	34,500
Commitments for Expenditure balance		34,500	34,500
Purchase of GIS (362KV 6300A 63KA) 27CB - KwangyangS/S
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts		37,694	37,476
Commitments for Expenditure balance		10,491	18,044
Purchase of GIS (800KV 8000A 50KA) 10CB - Shin-JungbuS/S
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts		63,730	63,730
Commitments for Expenditure balance		0	44,955
Purchase of transformer (765/345/23kV 666.7MVA, 2TANK) 6 units - Shin-JungbuS/S
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts		37,500	37,500
Commitments for Expenditure balance		0	37,500
Purchase of cable (TR CNCE-W/AL,1C,400SQ) 4,645,000M
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts		78,076	78,076
Commitments for Expenditure balance		0	76,762
Purchase of Concrete Poles (10M, 350KGF) 121,900 and 6 others
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts		133,387	133,387
Commitments for Expenditure balance		13,343	112,981
Advanced E-Type low voltage electricity meter 1,600,000 units
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts		65,408	65,408
Commitments for Expenditure balance		0	64,592
Purchase of Ground Switch (44-D-A125, 600AX4) and 1 other 4,016 units
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts		56,482	56,482
Commitments for Expenditure balance		0	55,990
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	0
Commitments for Expenditure balance		38,998	0
Purchase of cable (FR CNCO-W,1C,325SQ) 1,400,000
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts		57,475	0
Commitments for Expenditure balance		48,598	0
Purchase of switch (Eco) 9,360 units
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts		40,631	0
Commitments for Expenditure balance		34,797	0
Construction of Shin-Kori units (#3,4)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts		7,363,514	7,363,514
Commitments for Expenditure balance		3,211	93,637
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		5,930,099	6,757,146
Construction of Shin-Hanul units (#1,2)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts		7,982,342	7,982,342
Commitments for Expenditure balance		355,704	1,015,813
Construction of Shin-Hanul units (#3,4)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	[1]	0	8,261,818
Commitments for Expenditure balance	[1]	0	8,097,056
Other 27 contracts
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts		269,681	262,400
Commitments for Expenditure balance		161,243	114,041
Purchase of main machine for construction of Seoul Combined units (#1,2)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts		365,164	361,203
Commitments for Expenditure balance		51,165	99,031
Construction of Seoul Combined units (#1,2)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts		285,890	227,685
Commitments for Expenditure balance		27,125	60,568
Purchase of smoke eliminating machine for construction of Shin-Boryeong units (#1,2)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts		172,609	169,544
Commitments for Expenditure balance		13,986	36,417
Service of designing Shin-Boryeong units (#1,2)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts		120,199	127,810
Commitments for Expenditure balance		1,076	16,371
Purchase of main machine for construction of Shin-Boryeong units (#1,2)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts		866,065	866,065
Commitments for Expenditure balance		4,981	4,981
Construction of Shin-Boryeong units (#1,2)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts		309,466	316,190
Commitments for Expenditure balance		0	23,100
Purchase of furnace for construction of Shin-Seocheon thermal power plant
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts		305,209	302,030
Commitments for Expenditure balance		74,631	222,555
Purchase of turbine generator for construction of Shin-Seocheon thermal power plant
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts		104,402	104,402
Commitments for Expenditure balance		57,968	83,522
Electricity construction of Shin-Seocheon thermal power plant
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts		217,848	200,453
Commitments for Expenditure balance		174,122	196,993
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		11,272	15,409
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	193,375
Commitments for Expenditure balance		282	5,129
Purchase of furnace for construction of Taean units (#9,10)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts		556,504	566,945
Commitments for Expenditure balance		18,502	33,817
Service of designing Taean units (#9,10)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts		112,344	111,322
Commitments for Expenditure balance		13,338	13,671
Purchase of turbine generator for construction of Taean units (#9,10)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts		214,462	205,267
Commitments for Expenditure balance		10,422	550
Purchase of oxygen plant for construction of Taean IGCC units
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts		96,068	94,564
Commitments for Expenditure balance		1,552	199
Service of designing Taean IGCC plant units
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts		46,001	44,802
Commitments for Expenditure balance		3,161	2,669
Purchase of furnace for construction of Samcheok units (#1,2)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts		1,092,287	1,082,641
Commitments for Expenditure balance		12,215	5,963
Purchase of coal handling machine for construction of Samcheok units (#1,2)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts		307,925	304,924
Commitments for Expenditure balance		48,736	52,362
Service of designing Samcheok units (#1,2)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts		103,679	114,047
Commitments for Expenditure balance		0	4,745
Purchase of turbine main equipment for Samcheok units (#1,2)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts		212,188	215,333
Commitments for Expenditure balance		348	874
Purchase of main equipment for Namjeju
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts		146,594	0
Commitments for Expenditure balance		₩ 134,949	₩ 0
[1]	The Company recognized impairment loss in relation to Shin-Hanul unit 3 and 4, and there are no legally binding commitments for expenditure as of December 31, 2018.

Contracts for inventory purchas

Contracts for inventory purchase commitment (Details)	12 Months Ended
	Dec. 31, 2018
Concentrate
Disclosure of contracts for inventory purchase commitment [Line Items]
Periods	2018 ~ 2030
Contracted amounts	48,162 Ton U3O8
Transformed
Disclosure of contracts for inventory purchase commitment [Line Items]
Periods	2018 ~ 2030
Contracted amounts	23,484 Ton U
Enrichment
Disclosure of contracts for inventory purchase commitment [Line Items]
Periods	2018 ~ 2030
Contracted amounts	25,530 Ton SWU
Molded
Disclosure of contracts for inventory purchase commitment [Line Items]
Periods	2018 ~ 2022
Contracted amounts	520 Ton U

Litigation Case (Details)

Litigation Case (Details) ₩ in Millions	Dec. 31, 2018KRW (₩)₩ / shares	Dec. 31, 2017KRW (₩)₩ / shares
As the defendant
Litigation Case [Line Items]
Number of cases | ₩ / shares	570	565
Claim amount | ₩	₩ 673,882	₩ 477,719
As the plaintiff
Litigation Case [Line Items]
Number of cases | ₩ / shares	174	185
Claim amount | ₩	₩ 793,491	₩ 690,934

Commitments and Contingencies D

Commitments and Contingencies Disclosure (Details) - 12 months ended Dec. 31, 2018 ₱ in Thousands, € in Thousands, ₨ in Thousands, ₨ in Thousands, ر.س in Thousands, ¥ in Thousands, R in Thousands, $ in Thousands, $ in Thousands, ₩ in Millions	KRW (₩)	JPY (¥)	USD ($)	PHP (₱)	EUR (€)	INR (₨)	SAR (ر.س)	CAD ($)	NPR (₨)	ZAR (R)
Commitments on bank-overdraft
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Nonghyup Bank and others
Limited amount | ₩	₩ 1,855,000
Exercised amount | ₩	₩ 167,010
Commitments on bank-daylight overdraft
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Nonghyup Bank
Limited amount | ₩	₩ 280,000
Exercised amount | ₩	₩ 0
Limit amount available for CP
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	KEB Hana Bank and others
Limited amount | ₩	₩ 1,050,000
Exercised amount | ₩	₩ 0
Limit amount available for card
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	KEB Hana Bank and others
Limited amount | ₩	₩ 55,904
Exercised amount | ₩	₩ 2,740
Limit amount available for card
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Banco de Oro
Limited amount | ₱				₱ 5,000
Exercised amount | ₱				₱ 5,000
Loan limit
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Kookmin Bank and others
Limited amount | ₩	₩ 1,238,500
Exercised amount | ₩	₩ 612,197
Loan limit
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	DBS Bank and others
Limited amount			$ 1,840,700
Exercised amount			20,000
Certification of payment on payables from foreign country
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Kookmin Bank and others
Limited amount			44,680
Exercised amount			4,754
Certification of payment on L/C
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Shinhan Bank and others
Limited amount			992,434
Exercised amount			252,392
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	KEB 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	KEB Hana Bank and others
Limited amount | ₨						₨ 237,321
Exercised amount | ₨						237,321
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Korea Development Bank and others
Limited amount | ¥		¥ 637,322
Exercised amount | ¥		637,322
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Seoul Guarantee Insurance and others
Limited amount | ₩	₩ 89,335
Exercised amount | ₩	₩ 72,802
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	First Abu Dhabi Bank and others
Limited amount			923,915
Exercised amount			830,314
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	KEB Hana Bank
Limited amount | ر.س							ر.س 6,508
Exercised amount | ر.س							ر.س 6,508
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Bank of Kathmandu
Limited amount | ₨									₨ 36,304
Exercised amount | ₨									₨ 36,304
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	KEB Hana Bank
Limited amount								$ 617
Exercised amount								$ 617
Certification of bidding
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	KEB Hana Bank and others
Limited amount			110,000
Exercised amount			3,199
Certification of bidding
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Shinhan Bank
Limited amount | R										R 55,730
Exercised amount | R										R 55,730
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			3,934,928
Exercised amount			3,220,418
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	Nonghyup Bank and others
Limited amount | ₩	₩ 307,436
Exercised amount | ₩	₩ 7,088
Other commitments
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Export-Import Bank of Korea and others
Limited amount			1,171,470
Exercised amount			842,897
Inclusive credit
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Shinhan Bank
Limited amount | ₨						70,028
Exercised amount | ₨						₨ 70,028
Inclusive credit
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	KEB Hana Bank
Limited amount | ₩	₩ 258,000
Exercised amount | ₩	₩ 12,278
Inclusive credit
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	KEB Hana Bank and others
Limited amount			30,930
Exercised amount			18,245
Trade finance [Member]
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	BNP Paribas and others
Limited amount			800,000
Exercised amount			$ 0

Assets pledged as collateral (D

Assets pledged as collateral (Details) - 12 months ended Dec. 31, 2018 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
Shareholdings of DS Power Co., Ltd.
Disclsoure of assets pledged as collateral [Line Items]
Name of Guarantor		Korea Southern Power Co., Ltd
Name of Guarantee		Korea Development Bank and others
Value of collateral		₩ 916
Description of assets pledged as collateral description		Collateral for borrowings
Property, plant and equipment and others 1
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
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	[1]	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	[1]	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	[1]	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		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	[2]	Collateral for borrowings
Finance Lease receivable 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 | $			$ 337,000
Description of assets pledged as collateral description	[2]	Collateral for borrowings
[1]	As of December 31, 2018, the Company has established guarantees for pledge for transfer of rights of long-term borrowings, pledge for insurance claims, pledge for shares, etc.
[2]	This is based on the amount of loan commitment limit.

Subsequent Events (Details)

Subsequent Events (Details) ₩ in Millions	12 Months Ended
	Dec. 31, 2018KRW (₩)
#7 foreign bond
Subsequent Events - Issuance of bonds [Line Items]
company name	Korea Midland Power Co., Ltd.
Issue date	Jan. 22, 2019
Maturity	Jan. 22, 2022
Interest rate (%)	3.38%
Amounts issued for the subsequent period	₩ 300
#47-1 corporate bond
Subsequent Events - Issuance of bonds [Line Items]
company name	Korea Midland Power Co., Ltd.
Issue date	Feb. 8, 2019
Maturity	Feb. 8, 2039
Interest rate (%)	2.19%
Amounts issued for the subsequent period	₩ 160,000
#47-2 corporate bond
Subsequent Events - Issuance of bonds [Line Items]
company name	Korea Midland Power Co., Ltd.
Issue date	Feb. 8, 2019
Maturity	Feb. 8, 2049
Interest rate (%)	2.17%
Amounts issued for the subsequent period	₩ 120,000
#2 Swiss Franc bond
Subsequent Events - Issuance of bonds [Line Items]
company name	Korea Western Power Co., Ltd.
Issue date	Feb. 27, 2019
Maturity	Feb. 27, 2024
Interest rate (%)	0.13%
Amounts issued for the subsequent period	₩ 200
#32-1 non-guaranteed corporate bond
Subsequent Events - Issuance of bonds [Line Items]
company name	Korea East-West Power Co., Ltd.
Issue date	Mar. 7, 2019
Maturity	Mar. 7, 2039
Interest rate (%)	2.18%
Amounts issued for the subsequent period	₩ 40,000
#32-2 non-guaranteed corporate bond
Subsequent Events - Issuance of bonds [Line Items]
company name	Korea East-West Power Co., Ltd.
Issue date	Mar. 7, 2019
Maturity	Mar. 7, 2049
Interest rate (%)	2.16%
Amounts issued for the subsequent period	₩ 40,000