Huaneng Power International (HUNGF) 20-F 12 Apr 18 2017 FY Annual report (foreign) Financial data

Document and Entity Information

Document and Entity Information	12 Months Ended
	Dec. 31, 2017shares
Document Information [line items]
Document Type	20-F
Amendment Flag	false
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Entity Registrant Name	HUANENG POWER INTERNATIONAL INC
Entity Central Index Key	929,058
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Current Reporting Status	Yes
Entity Well-known Seasoned Issuer	Yes
Trading Symbol	HNP
A shares [member]
Document Information [line items]
Entity Common Stock, Shares Outstanding	10,500,000,000
Overseas listed foreign shares [member]
Document Information [line items]
Entity Common Stock, Shares Outstanding	4,700,383,440

Consolidated Statement of Compr

Consolidated Statement of Comprehensive Income - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Consolidated Statements of Comprehensive Income [abstract]
Operating revenue	¥ 152,459,444	¥ 113,814,236	[1]	¥ 128,904,873	[1]
Tax and levies on operations	(1,376,312)	(1,177,818)		(1,157,760)
Operating expenses
Fuel	(92,737,304)	(56,617,542)		(59,242,367)
Maintenance	(4,347,723)	(4,343,349)		(4,556,361)
Depreciation	(20,180,830)	(14,815,620)		(14,411,632)
Labor	(10,590,084)	(8,043,406)		(7,751,551)
Service fees on transmission and transformer facilities of HIPDC	(95,894)	(138,038)		(140,771)
Purchase of electricity	(3,787,032)	(3,066,415)		(3,581,517)
Others	(10,160,875)	(7,234,308)		(8,919,988)
Total operating expenses	(141,899,742)	(94,258,678)		(98,604,187)
Profit from operations	9,183,390	18,377,740		29,142,926
Interest income	198,906	147,063		160,723
Financial expenses, net
Interest expense	(9,749,004)	(6,817,526)	[1]	(7,945,734)	[1]
Exchange gain/ (loss) and bank charges, net	144,359	(250,076)		(24,336)
Total financial expenses, net	(9,604,645)	(7,067,602)		(7,970,070)
Share of profits less losses of associates and joint ventures	425,215	1,298,889	[1]	1,525,975	[1]
Gain/ (loss) on fair value changes of financial assets/liabilities	856,786	(12,986)		(16,742)
Other investment income	1,742,081	1,070,034		115,238
Profit before income tax expense	2,801,733	13,813,138	[1]	22,958,050	[1]
Income tax expense	(1,217,526)	(3,465,151)	[1]	(5,698,943)	[1]
Net profit	1,584,207	10,347,987		17,259,107
Items that may be reclassified subsequently to profit or loss:
Fair value changes of available-for-sale financial assets	281,663	(148,041)		558,261
Gain on disposal of available-for-sale financial assets reclassified to profit or loss	(1,135,356)	(741,648)		0
Share of other comprehensive income/ (loss) of investees accounted for under the equity method	121,208	(180,572)		678,793
Effective portion of cash flow hedges	62,853	1,015,103		51,922
Translation differences of the financial statements of foreign operations	84,418	540,442		(133,116)
Other comprehensive (loss) /income, net of tax	(585,214)	485,284		1,155,860
Total comprehensive income	998,993	10,833,271		18,414,967
Net profit attributable to:
Equity holders of the Company	1,579,836	8,520,427		13,651,933
Non-controlling interests	4,371	1,827,560		3,607,174
Net profit	1,584,207	10,347,987		17,259,107
Total comprehensive income/ (loss) attributable to:
Equity holders of the Company	1,023,118	9,005,227		14,807,889
Non-controlling interests	(24,125)	1,828,044		3,607,078
Total comprehensive income	¥ 998,993	¥ 10,833,271		¥ 18,414,967
Earnings per share attributable to the equity holders of the Company (expressed in RMB per share)
Basic and diluted	¥ 0.10	¥ 0.56		¥ 0.94
[1]	Restated. The Company completed the acquisition of equity interests of four companies from Huaneng Group, see Note 40 for details. As the acquisition is a business combination under common control, the transaction is accounted for under merger accounting method under PRC GAAP. The assets and liabilities acquired in business combinations are measured at the carrying amounts of the acquirees in the consolidated financial statements of the ultimate controlling party on the acquisition date. The operating results for all periods presented are retrospectively restated as if the current structure and operations resulting from the acquisition had been in existence from the date when the acquirees first became under the control of the same ultimate controlling party. Therefore the relevant comparative figures in the segment information were restated under PRC GAAP while the acquisition is accounted for using acquisition method under IFRS.

Consolidated Statement of Finan

Consolidated Statement of Financial Position - CNY (¥) ¥ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Non-current assets
Property, plant and equipment	¥ 284,328,093	¥ 223,061,809
Investments in associates and joint ventures	19,517,623	19,632,113
Investment property	217,406	0
Available-for-sale financial assets	1,604,993	3,406,032
Land use rights	11,264,785	8,456,347
Power generation licenses	3,916,246	3,849,199
Mining rights	1,646,271	1,646,271
Deferred income tax assets	2,300,091	1,263,957
Derivative financial assets	75,328	99,721
Goodwill	15,484,120	12,135,729
Other non-current assets	7,696,845	4,321,945
Total non-current assets	348,051,801	277,873,123
Current assets
Inventories	7,385,411	6,879,143
Other receivables and assets	6,081,517	5,533,770
Accounts receivable	25,447,595	16,393,471
Derivative financial assets	258,364	278,602
Bank balances and cash	9,364,823	7,881,630
Total current assets	48,537,710	36,966,616
Total assets	396,589,511	314,839,739	[1]
Capital and reserves attributable to equity holders of the Company [abstract]
Share capital	15,200,383	15,200,383
Perpetual corporate bonds	5,068,550	0
Capital surplus	24,114,400	24,760,331
Surplus reserves	8,140,030	8,140,030
Currency translation differences	(675,054)	(787,881)
Retained earnings	35,793,257	38,690,132
Capital and reserves attributable to equity holders of the Company	87,641,566	86,002,995
Non-controlling interests	19,973,038	16,183,742
Total equity	107,614,604	102,186,737
Non-current liabilities
Long-term loans	107,030,958	64,990,361
Long-term bonds	15,993,833	12,182,971
Deferred income tax liabilities	4,566,680	2,262,752
Derivative financial liabilities	148,486	201,169
Other non-current liabilities	5,284,462	2,819,498
Total non-current liabilities	133,024,419	82,456,751
Current liabilities
Accounts payable and other liabilities	38,900,132	28,746,617
Taxes payable	1,302,210	1,089,105
Dividends payable	1,735,426	1,575,180
Derivative financial liabilities	62,178	133,569
Short-term bonds	11,068,357	27,311,103
Short-term loans	80,251,348	57,668,874
Current portion of long-term loans	18,098,458	9,560,885
Current portion of long-term bonds	3,997,033	3,294,736
Current portion of other non-current liabilities	535,346	816,182
Total current liabilities	155,950,488	130,196,251
Total liabilities	288,974,907	212,653,002	[1]
Total equity and liabilities	¥ 396,589,511	¥ 314,839,739
[1]	Restated. The Company completed the acquisition of equity interests of four companies from Huaneng Group, see Note 40 for details. As the acquisition is a business combination under common control, the transaction is accounted for under merger accounting method under PRC GAAP. The assets and liabilities acquired in business combinations are measured at the carrying amounts of the acquirees in the consolidated financial statements of the ultimate controlling party on the acquisition date. The operating results for all periods presented are retrospectively restated as if the current structure and operations resulting from the acquisition had been in existence from the date when the acquirees first became under the control of the same ultimate controlling party. Therefore the relevant comparative figures in the segment information were restated under PRC GAAP while the acquisition is accounted for using acquisition method under IFRS.

Consolidated Statement of Chang

Consolidated Statement of Changes in Equity - CNY (¥) ¥ in Thousands	Share capital [member]	Perpetual corporate bonds [member]	Share premium [member]	Hedging reserve [member]	Available-for-sale financial assets revaluation reserve [member]	Other capital reserve [member]	Capital surplus [member]	Surplus reserve [member]	Currency translation differences [member]	Retained earnings [member]	Attributable to equity holders of the Company [member]	Non-controlling interests [member]	Total
Balance at period start at Dec. 31, 2014	¥ 14,420,383		¥ 18,322,575	¥ (1,091,109)	¥ 1,279,119	¥ 1,111,614	¥ 19,622,199	¥ 7,196,349	¥ (1,194,819)	¥ 30,085,379	¥ 70,129,491	¥ 14,653,215	¥ 84,782,706
Profit	0		0	0	0	0	0	0	0	13,651,933	13,651,933	3,607,174	17,259,107
Other comprehensive income/ (loss) :
Fair value changes of available-for-sale financial assets - gross	0		0	0	744,348	0	744,348	0	0	0	744,348	0	744,348
Fair value changes of and gain on disposal of available-for-sale financial assets - tax	0		0	0	(186,087)	0	(186,087)	0	0	0	(186,087)	0	(186,087)
Shares of other comprehensive income of investees - accounted for under the equity method - gross	0		0	0	904,007	0	904,007	0	0	0	904,007	0	904,007
Shares of other comprehensive income of investees - accounted for under the equity method - tax	0		0	0	(225,214)	0	(225,214)	0	0	0	(225,214)	0	(225,214)
Changes in fair value of effective portion of cash flow hedges - gross	0		0	(962,683)	0	0	(962,683)	0	0	0	(962,683)	0	(962,683)
Changes in fair value of effective portion of cash flow hedges - tax	0		0	166,135	0	0	166,135	0	0	0	166,135	0	166,135
Cash flow hedges recorded in shareholders' equity reclassified to inventories - gross	0		0	1,003,778	0	0	1,003,778	0	0	0	1,003,778	0	1,003,778
Cash flow hedges recorded in shareholders' equity reclassified to inventories - tax	0		0	(170,642)	0	0	(170,642)	0	0	0	(170,642)	0	(170,642)
Cash flow hedges recorded in shareholders' equity reclassified to exchange gain and bank charges, net - gross	0		0	(137,859)	0	0	(137,859)	0	0	0	(137,859)	0	(137,859)
Cash flow hedges recorded in shareholders' equity reclassified to exchange gain and bank charges, net - tax	0		0	23,436	0	0	23,436	0	0	0	23,436	0	23,436
Cash flow hedges recorded in shareholders' equity reclassified to interest expense - gross	0		0	161,124	0	0	161,124	0	0	0	161,124	0	161,124
Cash flow hedges recorded in shareholders' equity reclassified to interest expense - tax	0		0	(31,367)	0	0	(31,367)	0	0	0	(31,367)	0	(31,367)
Currency translation differences	0		0	0	0	0	0	0	(133,020)	0	(133,020)	(96)	(133,116)
Total comprehensive income	0		0	51,922	1,237,054	0	1,288,976	0	(133,020)	13,651,933	14,807,889	3,607,078	18,414,967
Business combinations (Note 40)	0		0	0	0	0	0	0	0	0	0	1,934,865	1,934,865
Issuance of new H shares, net of issuance expenses	780,000		3,904,314	0	0	0	3,904,314	0	0	0	4,684,314	0	4,684,314
Dividends relating to last year (Note 23)	0		0	0	0	0	0	0	0	(5,479,746)	(5,479,746)	(3,285,330)	(8,765,076)
Net capital injection from non-controlling interests of subsidiaries	0		0	0	0	0	0	0	0	0	0	623,107	623,107
Transfer to surplus reserve	0		0	0	0	0	0	943,681	0	(943,681)	0	0	0
Others	0		0	0	0	0	0	0	0	0	0	18,806	18,806
Balance at period end at Dec. 31, 2015	15,200,383		22,226,889	(1,039,187)	2,516,173	1,111,614	24,815,489	8,140,030	(1,327,839)	37,313,885	84,141,948	17,551,741	101,693,689
Profit	0		0	0	0	0	0	0	0	8,520,427	8,520,427	1,827,560	10,347,987
Other comprehensive income/ (loss) :
Fair value changes of available-for-sale financial assets - gross	0		0	0	(197,529)	0	(197,529)	0	0	0	(197,529)	0	(197,529)
Gain on disposal of available-for-sale financial assets reclassified to profit or loss - gross	0		0	0	(988,865)	0	(988,865)	0	0	0	(988,865)	0	(988,865)
Fair value changes of and gain on disposal of available-for-sale financial assets - tax	0		0	0	296,705	0	296,705	0	0	0	296,705	0	296,705
Shares of other comprehensive income of investees - accounted for under the equity method - gross	0		0	0	(242,217)	0	(242,217)	0	0	0	(242,217)	0	(242,217)
Shares of other comprehensive income of investees - accounted for under the equity method - tax	0		0	0	61,645	0	61,645	0	0	0	61,645	0	61,645
Changes in fair value of effective portion of cash flow hedges - gross	0		0	574,455	0	0	574,455	0	0	0	574,455	0	574,455
Changes in fair value of effective portion of cash flow hedges - tax	0		0	(95,407)	0	0	(95,407)	0	0	0	(95,407)	0	(95,407)
Cash flow hedges recorded in shareholders' equity reclassified to inventories - gross	0		0	603,527	0	0	603,527	0	0	0	603,527	0	603,527
Cash flow hedges recorded in shareholders' equity reclassified to inventories - tax	0		0	(102,600)	0	0	(102,600)	0	0	0	(102,600)	0	(102,600)
Cash flow hedges recorded in shareholders' equity reclassified to exchange gain and bank charges, net - gross	0		0	(55,838)	0	0	(55,838)	0	0	0	(55,838)	0	(55,838)
Cash flow hedges recorded in shareholders' equity reclassified to exchange gain and bank charges, net - tax	0		0	9,492	0	0	9,492	0	0	0	9,492	0	9,492
Cash flow hedges recorded in shareholders' equity reclassified to interest expense - gross	0		0	101,889	0	0	101,889	0	0	0	101,889	0	101,889
Cash flow hedges recorded in shareholders' equity reclassified to interest expense - tax	0		0	(20,415)	0	0	(20,415)	0	0	0	(20,415)	0	(20,415)
Currency translation differences	0		0	0	0	0	0	0	539,958	0	539,958	484	540,442
Total comprehensive income	0		0	1,015,103	(1,070,261)	0	(55,158)	0	539,958	8,520,427	9,005,227	1,828,044	10,833,271
Dividends relating to last year (Note 23)	0		0	0	0	0	0	0	0	(7,144,180)	(7,144,180)	(3,481,663)	(10,625,843)
Net capital injection from non-controlling interests of subsidiaries	0		0	0	0	0	0	0	0	0	0	285,620	285,620
Balance at period end at Dec. 31, 2016	15,200,383	¥ 0	22,226,889	(24,084)	1,445,912	1,111,614	24,760,331	8,140,030	(787,881)	38,690,132	86,002,995	16,183,742	102,186,737
Profit	0	68,600	0	0	0	0	0	0	0	1,511,236	1,579,836	4,371	1,584,207
Other comprehensive income/ (loss) :
Fair value changes of available-for-sale financial assets - gross	0	0	0	0	375,742	0	375,742	0	0	0	375,742	(50)	375,692
Gain on disposal of available-for-sale financial assets reclassified to profit or loss - gross	0	0	0	0	(1,581,994)	0	(1,581,994)	0	0	0	(1,581,994)	0	(1,581,994)
Fair value changes of and gain on disposal of available-for-sale financial assets - tax	0	0	0	0	352,646	0	352,646	0	0	0	352,646	(37)	352,609
Shares of other comprehensive income of investees - accounted for under the equity method - gross	0	0	0	0	162,858	0	162,858	0	0	0	162,858	0	162,858
Shares of other comprehensive income of investees - accounted for under the equity method - tax	0	0	0	0	(41,650)	0	(41,650)	0	0	0	(41,650)	0	(41,650)
Changes in fair value of effective portion of cash flow hedges - gross	0	0	0	85,558	0	0	85,558	0	0	0	85,558	0	85,558
Changes in fair value of effective portion of cash flow hedges - tax	0	0	0	(16,239)	0	0	(16,239)	0	0	0	(16,239)	0	(16,239)
Cash flow hedges recorded in shareholders' equity reclassified to inventories - gross	0	0	0	(109,817)	0	0	(109,817)	0	0	0	(109,817)	0	(109,817)
Cash flow hedges recorded in shareholders' equity reclassified to inventories - tax	0	0	0	18,669	0	0	18,669	0	0	0	18,669	0	18,669
Cash flow hedges recorded in shareholders' equity reclassified to exchange gain and bank charges, net - gross	0	0	0	(2,657)	0	0	(2,657)	0	0	0	(2,657)	0	(2,657)
Cash flow hedges recorded in shareholders' equity reclassified to exchange gain and bank charges, net - tax	0	0	0	452	0	0	452	0	0	0	452	0	452
Cash flow hedges recorded in shareholders' equity reclassified to interest expense - gross	0	0	0	107,233	0	0	107,233	0	0	0	107,233	0	107,233
Cash flow hedges recorded in shareholders' equity reclassified to interest expense - tax	0	0	0	(20,346)	0	0	(20,346)	0	0	0	(20,346)	0	(20,346)
Currency translation differences	0	0	0	0	0	0	0	0	112,827	0	112,827	(28,409)	84,418
Total comprehensive income	0	68,600	0	62,853	(732,398)	0	(669,545)	0	112,827	1,511,236	1,023,118	(24,125)	998,993
Business combinations (Note 40)	0	0	0	0	0	0	0	0	0	0	0	6,292,577	6,292,577
Issue of perpetual corporate bonds (Note 21)	0	4,999,950	0	0	0	0	0	0	0	0	4,999,950	0	4,999,950
Dividends relating to last year (Note 23)	0	0	0	0	0	0	0	0	0	(4,408,111)	(4,408,111)	(2,344,391)	(6,752,502)
Net capital injection from non-controlling interests of subsidiaries	0	0	0	0	0	0	0	0	0	0	0	846,847	846,847
Disposal of non-controlling interests of a subsidiary	0	0	28,054	0	0	0	28,054	0	0	0	28,054	(28,054)	0
Acquisition of non-controlling interests of a subsidiary	0	0	(4,440)	0	0	0	(4,440)	0	0	0	(4,440)	(86,699)	(91,139)
Disposal of subsidiaries (Note 6)	0	0	0	0	0	0	0	0	0	0	0	(866,859)	(866,859)
Balance at period end at Dec. 31, 2017	¥ 15,200,383	¥ 5,068,550	¥ 22,250,503	¥ 38,769	¥ 713,514	¥ 1,111,614	¥ 24,114,400	¥ 8,140,030	¥ (675,054)	¥ 35,793,257	¥ 87,641,566	¥ 19,973,038	¥ 107,614,604

Consolidated Statement of Cash

Consolidated Statement of Cash Flows - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Profit before income tax expense	¥ 2,801,733	¥ 13,813,138	[1]	¥ 22,958,050	[1]
Adjustments to reconcile profit before income tax expense to net cash provided by operating activities:
Depreciation	20,180,830	14,815,620		14,411,632
Provision for impairment loss on property, plant and equipment	1,046,195	1,063,735		1,047,641
Provision for impairment loss on investment in an associate	0	0		178,131
Provision for impairment loss on goodwill	0	0		1,105,649
Provision for impairment loss on mining rights	0	0		760,296
Provision for impairment loss on land use rights	108,590	51,981		0
Provision for other non-current assets	5,008	0		0
Amortization of land use rights	341,125	225,707		213,206
Amortization of other non-current assets	113,878	121,388		92,775
Amortization of employee housing subsidies	653	866		940
Recognition/ (reversal) of provision for doubtful accounts	27,682	89,498		(3,392)
(Reversal) /recognition of provision for inventory obsolescence	(263)	(256)		1,828
(Gain) /Loss on fair value changes of financial assets/liabilities	(856,786)	12,986		16,742
Other investment income	(1,742,081)	(1,070,034)		(115,238)
Net loss on disposals of non-current assets	616,456	590,049		438,321
Unrealized exchange (gain) /loss, net	(157,056)	195,055		166,148
Share of profits less losses of associates and joint ventures	(425,215)	(1,298,889)		(1,525,975)
Interest income	(198,906)	(147,063)		(160,723)
Interest expense	9,749,004	6,817,526		7,945,734
Others	171,611	(213,089)		(89,332)
Changes in working capital, net of effects of acquisitions:
Inventories	714,045	(1,270,582)		2,106,821
Other receivables and assets	(199,023)	(20,810)		72,925
Accounts receivable	(6,201,149)	(838,272)		(175,429)
Restricted cash	9,670	(11,566)		499,899
Accounts payable and other liabilities	2,414,376	1,912,034		(2,856,958)
Taxes payable	2,543,863	1,279,505		1,366,209
Interest received	136,134	84,806		102,813
Income tax expense paid	(2,003,011)	(4,692,509)		(6,196,005)
Net cash provided by operating activities	29,197,363	31,510,824		42,362,708
CASH FLOWS FROM INVESTING ACTIVITIES
Payment for the purchase of property, plant and equipment	(25,798,009)	(20,144,903)		(24,191,285)
Proceeds from disposal of property, plant and equipment, land use rights and other non-current assets	286,609	144,346		109,013
Prepayments of land use rights	(213,928)	(89,430)		(136,045)
Payment for the purchase of other non-current assets	(33,498)	(50,653)		(6,981)
Cash dividends received	1,419,380	1,057,642		937,189
Payment for investment in associates and joint ventures	(301,916)	(276,118)		(889,780)
Cash paid for acquiring available-for-sale financial assets	(5,600)	0		0
Cash consideration paid for acquisition of subsidiaries, net of cash acquired	(10,817,107)	157,421		(8,887,882)
Cash received from disposal of a subsidiary, net of cash of the subsidiaries	530,437	0		0
Cash received from disposal of available-for-sale financial assets	2,186,758	1,474,301		0
Others	998,049	77,748		50,759
Net cash used in investing activities	(31,748,825)	(17,649,646)		(33,015,012)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuance of short-term bonds	30,988,679	32,982,340		18,980,000
Repayments of short-term bonds	(47,000,000)	(25,000,000)		(18,000,000)
Proceeds from short-term loans	107,564,128	85,689,874		67,298,044
Repayments of short-term loans	(96,378,054)	(77,904,489)		(62,600,955)
Proceeds from long-term loans	32,706,327	15,978,023		9,943,689
Repayments of long-term loans	(17,390,982)	(20,702,421)		(12,799,719)
Issuance of long-term bonds	7,800,000	4,200,000		0
Repayments of long-term bonds	(3,300,000)	(11,500,000)		(5,000,000)
Interest paid	(10,080,102)	(7,344,781)		(8,677,316)
Net proceeds from the issuance of new H shares	0	0		4,684,314
Net proceeds from the issuance of perpetual corporate bonds	4,999,950	0		0
Net capital injection from non-controlling interests of subsidiaries	838,084	285,620		623,107
Dividends paid to shareholders of the Company	(4,352,973)	(7,206,220)		(5,535,655)
Dividends paid to non-controlling interests of subsidiaries	(2,184,145)	(2,695,378)		(2,954,194)
Proceeds from sales leaseback classified as finance lease	0	0		100,000
Government grants	590,629	233,276		322,011
Payment for finance leasing	(695,019)	(571,485)		0
Others	(93,342)	(46,209)		(523,985)
Net cash generated from/ (used in) financing activities	4,013,180	(13,601,850)		(14,140,659)
Effect of exchange rate fluctuations on cash held	10,171	72,923		32,846
NET INCREASE/ (DECREASE) IN CASH AND CASH EQUIVALENTS	1,471,889	332,251		(4,760,117)
Cash and cash equivalents as at beginning of the year	7,810,501	7,478,250		12,238,367
CASH AND CASH EQUIVALENTS AS AT END OF THE YEAR	¥ 9,282,390	¥ 7,810,501		¥ 7,478,250
[1]	Restated. The Company completed the acquisition of equity interests of four companies from Huaneng Group, see Note 40 for details. As the acquisition is a business combination under common control, the transaction is accounted for under merger accounting method under PRC GAAP. The assets and liabilities acquired in business combinations are measured at the carrying amounts of the acquirees in the consolidated financial statements of the ultimate controlling party on the acquisition date. The operating results for all periods presented are retrospectively restated as if the current structure and operations resulting from the acquisition had been in existence from the date when the acquirees first became under the control of the same ultimate controlling party. Therefore the relevant comparative figures in the segment information were restated under PRC GAAP while the acquisition is accounted for using acquisition method under IFRS.

Company organization and princi

Company organization and principal activities	12 Months Ended
	Dec. 31, 2017
Company organization and principal activities [abstract]
Company organization and principal activities	1 Company organization and principal activities Huaneng Power International, Inc. (the "Company") was incorporated in the People's Republic of China (the "PRC") as a Sino-foreign joint stock limited company on 30 June 1994. The registered address of the Company is Huaneng Building, 6 Fuxingmennei Street, Xicheng District, Beijing, the PRC. The Company and its subsidiaries are principally engaged in the generation and sale of electric power to the respective regional or provincial grid companies in the PRC and in the Republic of Singapore ("Singapore"). The Company conducts its business in Singapore through SinoSing Power Pte Ltd. ("SinoSing Power") and its subsidiaries. The directors consider Huaneng International Power Development Corporation ("HIPDC") and China Huaneng Group Co., Ltd. ("Huaneng Group") as the parent company and ultimate parent company of the Company, respectively. Both HIPDC and Huaneng Group are incorporated in the PRC. HIPDC does not produce financial statements available for public use.

Principal accounting policies

Principal accounting policies	12 Months Ended
	Dec. 31, 2017
Principal accounting policies [abstract]
Principal accounting policies	2 Principal accounting policies The principal accounting policies adopted in the preparation of these financial statements are set out below. These policies have been consistently applied to all the years presented, unless otherwise stated. (a) Basis of preparation These financial statements have been prepared in accordance with International Financial Reporting Standards ("IFRS") as issued by the International Accounting Standards Board (the "IASB"). These financial statements have been prepared under the historical cost convention, as modified by the revaluation of available-for-sale financial assets, financial assets at fair value through profit or loss and derivative financial assets and liabilities. The preparation of financial statements in conformity with IFRS requires the use of certain critical accounting estimates. It also requires management to exercise its judgment in the process of applying the Company and its subsidiaries' accounting policies. The areas involving a higher degree of judgment or complexity, or areas where assumptions and estimates are significant to the financial statements are disclosed in Note 4. As at 31 December 2017, the Company and its subsidiaries have net current liabilities of approximately RMB107.4 billion, and a portion of the Company and its subsidiaries' funding requirements for capital expenditures were satisfied by short-term financing. Taking into consideration of the expected operating cash flows of the Company and its subsidiaries and the undrawn available banking facilities of approximately RMB241.9 billion as at 31 December 2017, the Company and its subsidiaries are expected to refinance certain of its short-term loans and bonds and also to consider alternative sources of financing, where applicable and when needed. Therefore, the directors of the Company are of the opinion that the Company and its subsidiaries will be able to meet its liabilities as and when they fall due within the next twelve months and accordingly, these consolidated financial statements are prepared on a going concern basis. The IASB has issued several amendments to IFRSs that are first effective for the current accounting period of the Company and its subsidiaries. None of these developments have had a material effect on how the Company and its subsidiaries' results and financial position for the current or prior periods have been prepared or presented. However, additional disclosure has been included in Note 35 to satisfy the new disclosure requirements introduced by the amendments to IAS 7, Statement of cash flows: Disclosure initiative (b) Consolidation The consolidated financial statements include the financial statements of the Company and all of its subsidiaries. Subsidiaries are investees over which the Company and its subsidiaries have the power to exercise control. The Company and its subsidiaries control an entity when it is exposed, or have rights to variable returns from their involvement with the entity and have the ability to affect those returns through their power over the entity. In assessing whether the Company and its subsidiaries have power, only substantive rights (held by the Company and its subsidiaries and other parties) are considered. Subsidiaries are consolidated from the date when control is transferred to the Company and its subsidiaries. They are de-consolidated from the date when control ceases. Intra-group balances, transactions and cash flows, and any unrealised income and expenses arising from intra-group transactions, are eliminated in full in preparing the consolidated financial statements. Unrealised gains arising from transactions with equity accounted investees are eliminated against the investment to the extent of the Company and its subsidiaries' interest in the investee. Unrealised losses are eliminated in the same way as unrealised gains, but only to the extent that there is no evidence of impairment. The portion of the shareholders' equity of the subsidiaries, which is not attributable directly or indirectly to the parent company, is separately presented as non-controlling interests in the shareholders' equity in the consolidated financial statements. When there is any inconsistency on the accounting policies or financial period adopted between subsidiaries and the Company, the financial statements of subsidiaries are adjusted according to the accounting policies or financial period adopted by the Company. (i) Business combinations The acquisition method is used to account for the business combinations of the Company and its subsidiaries (including business combinations under common controls). The consideration transferred for the acquisition of a subsidiary is the fair values of the assets transferred, the liabilities incurred to the former owners of the acquiree and the equity interests issued by the Company and its subsidiaries. Any contingent consideration is measured at fair value at the date of acquisition. If an obligation to pay contingent consideration that meets the definition of a financial instrument is classified as equity, then it is not remeasured and settlement is accounted for within equity. Otherwise, other contingent consideration is remeasured at fair value at each reporting date and subsequent changes in the fair value of the contingent consideration are recognised in profit or loss. Acquisition-related costs are expensed as incurred. Identifiable assets acquired and liabilities and contingent liabilities assumed in a business combination are measured initially at their fair values at the acquisition date. On an acquisition-by-acquisition basis, the Company and its subsidiaries recognize any non-controlling interests in the acquiree either at fair value or at the non-controlling interest's proportionate share of the recognized amounts of acquiree's identifiable net assets. The excess of the consideration transferred, the amount of any non-controlling interest in the acquiree and the acquisition-date fair value of any previous equity interest in the acquiree over the fair value of the identifiable net assets acquired is recorded as goodwill (Note 2(i)). If this consideration is lower than the fair value of the net assets of the subsidiary acquired, the difference is recognized in profit or loss. (ii) Changes in ownership interests in subsidiaries Transactions with non-controlling interests that do not result in loss of control are accounted for as equity transactions - that is, as transactions with the equity owners in their capacity as owners. The difference between fair value of any consideration paid and the relevant share acquired of the carrying value of net assets of the subsidiary is recorded in equity. Gains or losses on disposals to non-controlling interests are also recorded in equity. When the Company and its subsidiaries lose control of a subsidiary, it is accounted for as a disposal of the entire interest in that subsidiary, with a resulting gain or loss being recognized in profit or loss. Any interest retained in that former subsidiary at the date when control is lost is recognized at fair value and this amount is regarded as the fair value on initial recognition of a financial asset (Note 2(k)) or, when appropriate, the cost on initial recognition of an investment in an associate or joint venture (Note 2(b)(iii)). (iii) Associates and joint ventures Associates are investees over which the Company and its subsidiaries have significant influence on the financial and operating decisions. A joint venture is an arrangement whereby the Company and its subsidiaries and other parties contractually agree to share control of the arrangement, and have rights to the net assets of the arrangement. Investments in associates and joint ventures are initially recognized at cost and are subsequently measured using the equity method of accounting, unless it is classified as held for sale (or included in a disposal group that is classified as held for sale). The excess of the initial investment cost over the proportionate share of the fair value of identifiable net assets of investee acquired is included in the initial investment cost (Note 2(i)). Any shortfall of the initial investment cost to the proportionate share of the fair value of identifiable net assets of investee acquired is recognized in current period profit or loss and long-term investment cost is adjusted accordingly. When applying equity method, the Company and its subsidiaries adjust net profit or loss of the investees, including the fair value adjustments on the net identifiable assets of the associates and joint ventures and the adjustments to align with the accounting policies of the Company and the Company's financial reporting periods. Current period investment income is then recognized based on the proportionate share of the Company and its subsidiaries in the investees' net profit or loss. Net losses of investees are recognized to the extent of the carrying value of long-term equity investments and any other constituting long-term equity investments in investees that in substance form part of the investments in the investees. The Company and its subsidiaries continue to recognize investment losses and provision if they bear additional obligations which meet the recognition criteria. The Company and its subsidiaries adjust the carrying amount of the investment and directly recognize into related other comprehensive income based on their proportionate share on the movements of the investees' other comprehensive income. When the investees appropriate profit or declare dividends, the carrying value of long-term equity investments are reduced correspondingly by the proportionate share of the distribution. The Company and its subsidiaries determine at each reporting date whether there is any objective evidence that the investment in the associate or the joint venture is impaired. If this is the case, the Company and its subsidiaries calculate the amount of impairment as the difference between the recoverable amount of the associate or the joint venture and its carrying value and recognize the amount in the consolidated statement of comprehensive income. Profits or losses resulting from transactions between the Company and its subsidiaries and the associates and joint ventures are recognized in the Company and its subsidiaries' financial statements only to the extent of the unrelated third party investor's interests in the associates and joint ventures. Loss from transactions between the Company and its subsidiaries and the associates and joint ventures is fully recognized and not eliminated when there is evidence for asset impairment. If an investment in an associate becomes an investment in a joint venture or vice versa, retained interest is not remeasured. Instead, the investment continues to be accounted for under the equity method. Gains and losses arising from dilution of investments in associates and joint ventures are recognized in the consolidated statement of comprehensive income. In all other cases, when the Company and its subsidiaries cease to have significant influence over an associate or joint control over a joint venture, it is accounted for as a disposal of the entire interest in that investee, with a resulting gain or loss being recognized in profit or loss. Any interest retained in that former investee at the date when significant influence or joint control is lost is recognized at fair value and this amount is regarded as the fair value on initial recognition of a financial asset (Note 2(k)). (c) Segment reporting The Company and its subsidiaries determine the operating segment based on the internal organization structure, management requirement and internal reporting system for purposes of presenting reportable segment information. An operating segment represents a component of the Company and its subsidiaries that meets all the conditions below: (i) the component earns revenue and incurs expenses in its daily operating activities; (ii) chief operating decision maker of the Company and its subsidiaries regularly reviews the operating results of the component in order to make decisions on allocating resources and assessing performance; (iii) the financial position, operating results, cash flows and other related financial information of the component are available. When the two or more operating segments exhibit similar economic characteristics and meet certain conditions, the Company and its subsidiaries combine them as one reportable segment. (d) Foreign currency translation (i) Functional and presentation currency Items included in the financial statements of each of the Company and its subsidiaries are measured using the currency of the primary economic environment in which the entity operates (the "functional currency"). The consolidated financial statements are presented in Renminbi ("RMB"), which is the Company's functional and presentation currency. (ii) Transactions and balances Foreign currency transactions are translated into the functional currency using the spot exchange rate on the transaction dates. As at the end of reporting period, foreign currency monetary items are translated into functional currency at the spot exchange rate as at the end of reporting period. Exchange differences are directly expensed in current period profit or loss unless they arises from foreign currency loans borrowed for purchasing or construction of qualifying assets which is eligible for capitalization or they arise from monetary items that qualify as hedging instruments in cash flow hedges which are recorded in other comprehensive income to the extent that the hedge is effective. (iii) Foreign subsidiaries The operating results and financial position of the foreign subsidiaries are translated into presentation currency as follows: Asset and liability items in each statement of financial position of foreign operations are translated at the closing rates at the end of reporting period; equity items excluding retained earnings are translated at the spot exchange rates at the date of the transactions. Income and expense items in the statement of comprehensive income of the foreign operations are translated at average exchange rates approximating the rate on transaction dates. All resulting translation differences are recognized in other comprehensive income. The cash flows denominated in foreign currencies and cash flows of overseas subsidiaries are translated at average exchange rates approximating the rates at the dates when cash flows incurred. The effect of the foreign currency translation on the cash and cash equivalents is presented in the statement of cash flows separately. On the disposal of a foreign operation (that is, a disposal of the Company and its subsidiaries' entire interest in a foreign operation, or a disposal involving loss of control over a subsidiary that includes a foreign operation, a disposal involving loss of joint control over a joint ventures that includes a foreign operation, or a disposal involving loss of significant influence over an associate that includes a foreign operation), all of the exchange differences accumulated in equity in respect of that operation attributable to the equity holders of the Company are reclassified to profit or loss. In the case of a partial disposal that does not result in the Company and its subsidiaries losing control over a subsidiary that includes a foreign operation, the proportionate share of accumulated exchange differences are re-attributed to non-controlling interests and are not recognized in profit or loss. For all other partial disposals (that is, reductions in the Company and its subsidiaries' ownership interest in associates or joint venture that includes a foreign operation that do not result in the Company and its subsidiaries losing significant influence or joint control), the proportionate share of the accumulated exchange difference is reclassified to profit or loss. ( e ) Property, plant and equipment Property, plant and equipment consists of dam, port facilities, buildings, electric utility plant in service, transportation facilities, others and construction-in-progress ("CIP"). Property, plant and equipment acquired or constructed are initially recognized at cost and carried at the net value of cost less accumulated depreciation and accumulated impairment loss, unless classified as held for sale (or included in a disposal group that is classified as held for sale). Cost of CIP comprises construction expenditures, other expenditures necessary for the purpose of preparing the CIP for its intended use, those borrowing costs incurred before the assets are ready for intended use that are eligible for capitalization. CIP is not depreciated until such time as the relevant asset is completed and ready for its intended use. Subsequent costs about property, plant and equipment are included in the asset's carrying amount only when it is probable that future economic benefits associated with the item will flow to the Company and its subsidiaries and the cost of the item can be measured reliably. The carrying amount of the replaced part is derecognized. Other subsequent expenditures not qualified for capitalization are charged in the current period profit or loss when they are incurred. Depreciation of property, plant and equipment is provided based on book value of the asset less estimated residual value over the estimated useful life using straight-line method. For those impaired property, plant and equipment, depreciation is provided based on book value after deducting impairment provision over the estimated useful life of the asset. The estimated useful lives are as follows: Estimated useful lives Dam 8 - 50 years Port facilities 20 - 40 years Buildings 8 - 30 years Electric utility plant in service 5 - 30 years Transportation facilities 8 - 27 years Others 5 - 14 years Where parts of an item of property, plant and equipment have different useful lives, the cost of the item is allocated on a reasonable basis between the parts and each part is depreciated separately. At the end of each year, the Company and its subsidiaries review the estimated useful lives, residual values and the depreciation method of the property, plant and equipment and make adjustment when necessary. Property, plant and equipment is derecognized when it is disposed of, or is not expected to bring economic benefit through use or disposal. The amount of disposal proceeds arising from sale, transfer, disposal or write-off of the property, plant and equipment less book value and related tax expenses is recorded in 'operating expenses - others' in the statement of comprehensive income. The carrying amount of property, plant and equipment is written down immediately to its recoverable amount when its carrying amount is greater than its recoverable amount (Note 2(j)). ( f ) Investment property Investment properties are land and/or buildings which are owned or held under a leasehold interest (Note 2(y)) to earn rental income and/or for capital appreciation. These include land held for a currently undetermined future use and property that is being constructed or developed for future use as investment property. Investment properties are stated at fair value, unless they are still in the course of construction or development at the end of the reporting period and their fair value cannot be reliably measured at that time. Any gain or loss arising from a change in fair value or from the retirement or disposal of an investment property is recognized in profit or loss. Rental income from investment properties is accounted for as described in Note 2(x)(vi). ( g ) Power generation license The Company and its subsidiaries acquired the power generation license as part of the business combination with Tuas Power Ltd. ("Tuas Power"). The power generation license is initially recognized at fair value at the acquisition date. The license has an indefinite useful life and is not amortized. The assessment that the license has an indefinite useful life is based on the expected renewal of power generation license without significant restriction and cost, together with the consideration on related future cash flows generated and the expectation of continuous operations. It is tested annually for impairment and carried at cost less accumulated impairment loss. Useful life of the power generation license is reviewed by the Company and its subsidiaries each financial period to determine whether events and circumstances continue to support the indefinite useful life assessment. (h) Mining rights Mining rights are stated at cost less accumulated amortization and impairment losses (Note 2(j)) and are amortized based on the units of production method utilizing only recoverable coal reserves as the depletion base, unless the mining rights are classified as held for sale (or included in a disposal group that is classified as held for sale). (i) Goodwill Goodwill arising from the acquisitions of subsidiaries, associates and joint ventures represents the excess of the consideration transferred, the amount of any non-controlling interest in the acquiree and the acquisition-date fair value of any previous equity interest in the acquiree over the Company and its subsidiaries' share of the net fair value of the net identifiable assets, liabilities and contingent liabilities of the acquiree at the date of acquisition. Goodwill is stated at cost less accumulated impairment losses. Goodwill arising on a business combination is allocated to each cash-generating unit, or groups of cash generating units, that is expected to benefit from the synergies of the combination and is tested annually for impairment (Note 2(j)). On disposal of a cash generating unit during the year, any attributable amount of purchased goodwill is included in the calculation of the profit or loss on disposal. (j) Impairment of non-financial assets The carrying amounts of property, plant and equipment, mining rights, intangible assets with definite useful lives, land use rights and long-term equity investments not accounted for as financial assets are reviewed at each reporting date to determine whether there is any indication of impairment. If any such indication exists, then the asset's recoverable amount is estimated. Goodwill, indefinite-lived intangible assets and intangible assets not yet available for sale are tested for impairment annually regardless of whether there are indications of impairment or more frequently if events or changes in circumstances indicate a potential impairment. An impairment loss is recognized if the carrying amount of an asset or cash-generating unit ("CGU") exceeds its recoverable amount The recoverable amount of an asset or CGU is the greater of its value in use and its fair value less cost to sell. For impairment testing, assets are grouped together into the smallest group of assets that generates cash inflows from continuing use that are largely independent of the cash inflows of other assets or CGUs. Subject to an operating segment ceiling test, CGUs to which goodwill has been allocated are aggregated so that the level at which impairment testing is performed reflects the lowest level at which goodwill is monitored for internal reporting purposes. Goodwill acquired in a business combination is allocated to groups of CGUs that are expected to benefit from the synergies of the combination. Impairment losses are recognized in profit or loss. Impairment losses recognized in respect of CGUs are allocated first to reduce the carrying amount of any goodwill allocated to the CGU (group of CGUs), and then to reduce the carrying amounts of the other assets in the CGU (group of CGUs) on a pro rata basis, except that the carrying value of an asset will not be reduced below its individual fair value less costs of disposal (if measurable) or value in use (if determinable). An impairment loss in respect of goodwill is not reversed. Except for goodwill, all impaired non-financial assets are subject to review for possible reversal of impairment at each reporting date. A reversal of an impairment loss is limited to the asset's carrying amount that would have been determined had no impairment loss been recognized in prior year. Reversals of impairment losses are credited to profit or loss in the year in which the reversals are recognized. (k) Financial instruments Financial assets are classified in the following categories at initial recognition: at fair value through profit or loss, loans and receivables and available-for-sale. The classification depends on the intention and ability of the Company and its subsidiaries to hold the financial assets. (i) Financial assets at fair value through profit or loss Financial assets at fair value through profit or loss include financial assets held for trading and designated upon initial recognition as at fair value through profit or loss, and contingent consideration of the acquirer in a business combination. A financial asset is classified in this category if acquired principally for the purpose of selling in the short term. Derivatives are classified as held for trading unless they are designated as hedges. Assets in this category are classified as current assets if expected to be settled within 12 months; otherwise, they are classified as non-current. (ii) Loans and receivables Loans and receivables refer to the non-derivative financial assets for which there is no quotation in the active market with fixed or determinable amount. They are included in current assets, except for maturities greater than 12 months after the end of reporting period which are classified as non-current assets. Loans and receivables are primarily included in as 'accounts receivable', 'other receivables and assets' and 'other non-current assets' in the statement of financial position. (iii) Available-for-sale financial assets Available-for-sale financial assets are non-derivative financial assets that are either designated in this category or not classified in any of the other categories. They are included in current assets when management intends to dispose of the available-for-sale financial assets within 12 months of the end of reporting period, otherwise, they are classified as non-current assets. (iv) Recognition and measurement Regular purchases and sales of financial assets are recognized at fair value initially on trade-date - the date on which the Company and its subsidiaries commit to purchase or sell the asset. Transaction costs relating to financial assets at fair value through profit or loss are directly expensed in the profit or loss as incurred. Transaction costs for other financial assets are included in the carrying amount of the asset at initial recognition. Financial assets are derecognized when the rights to receive cash flows from the financial assets have expired or have been transferred and all risks and rewards related to the ownership of the financial assets have been transferred to the transferee. Financial assets at fair value through profit or loss and available-for-sale are subsequently measured at fair value. When an active market exists for a financial instrument, fair value is determined based on quoted prices in the active market. When no active market exists, fair value is determined by using valuation techniques. When applying valuation techniques, the Company and its subsidiaries maximize the use of relevant observable inputs and minimize the use of unobservable inputs. Changes in the fair value of financial assets at fair value through profit or loss are recorded in 'gain/(loss) on fair value changes of financial assets/liabilities'. Investments in equity instruments that do not have a quoted market price in an active market and whose fair value cannot be reliably measured are measured at cost. Loans and receivables are carried at amortized cost using the effective interest method. Except for impairment loss and translation differences on monetary financial assets, changes in the fair value of available-for-sale financial assets are recognized in other comprehensive income. When these financial assets are derecognized, the accumulated fair value adjustments recognized in equity are included in the statement of comprehensive income as 'other investment income'. Dividends on available-for-sale financial assets are recorded in 'other investment income' when the right of the Company and its subsidiaries to receive payments is established. (v) Impairment of financial assets Except for financial assets at fair value through profit or loss, the Company and its subsidiaries perform assessment on the book value of financial assets at the end of reporting period. Provision for impairment is made when there is objective evidence showing that a financial asset is impaired. For investments in associates and joint ventures, the impairment loss is measured by comparing the recoverable amount of the investment with its carrying amount. The impairment loss is reversed if there has been a favourable change in the estimates used to determine the recoverable amount. In the case of equity investments classified as available for sale, a significant or prolonged decline in the fair value of the investment below its cost is evidence that the assets are impaired. If any such evidence exists for available-for-sale financial assets, the cumulative loss, measured as the difference between the acquisition cost and the current fair value, less any impairment loss on that financial asset previously recognized in profit or loss, is removed from equity and recognized in profit or loss. Impairment losses recognized in the profit or loss on equity instruments are not reversed through the profit or loss. When financial assets carried at amortized cost are impaired, the carrying amount of the financial assets is reduced to the present value of estimated future cash flows (excluding future credit losses that have not been incurred) discounted at the financial asset's original effective interest rate. The impaired amount is recognized as assets impairment loss in the current period. If there is objective evidence that the value of the financial assets has recovered as a result of objective changes in circumstances occurring after the impairment loss was originally recognized, the originally recognized impairment loss is reversed through profit or loss. For the impairment test of receivables, please refer to Note 2(l). (vi) Derivative financial instruments and hedging activities Derivatives are initially recognized at fair value on the date a derivative contract is entered into and are subsequently remeasured at their fair value. Gain or loss arising from subsequent change in the fair value of derivative financial instruments is recognized in profit or loss except for the effective portions of gain or loss on the derivative financial instruments designated as cash flow hedges which are recognized directly in other comprehensive income. Cash flow hedge represents a hedge against the exposure to variability in cash flows, which such cash flow is originated from a particular risk associated with highly probable forecast transactions and variable rate borrowings and which could affect the statement of comprehensive income. The hedged items of cash flow hedge are the designated items with respect to the risks associated with future cash flow change resulting from variability in cash flows of a recognized asset or liability or a highly probable forecast transaction or the foreign currency risk of a committed future transaction. Hedging instruments are designated derivative for cash flow hedge whose cash flows are expected to offset changes in the cash flows of a hedged item. The full fair value of a hedging derivative is classified as a non-current asset or liability when the remaining maturity of the hedge item is more than 12 months. The Company and its subsidiaries document their assessments, both at hedge inception and on an ongoing basis, of whether the derivatives that are used in hedging transactions are highly effective in offsetting changes in cash flows of hedged items. The Company and its subsidiaries apply ratio analysis method to evaluate the ongoing effectiveness of the cash flow hedge. The effective portion of changes in the fair value of derivatives that are designated and qualify as cash flow hedges are recognized in other comprehensive income. The gain or loss relating to the ineffective portion is recognized immediately in the statement of comprehensive income within 'gain/(loss) on fair value changes of financial assets/liabilities'. Amounts accumulated in e

Financial and capital risks man

Financial and capital risks management	12 Months Ended
	Dec. 31, 2017
Financial and capital risks management [abstract]
Financial and capital risks management	3 Financial and capital risks management (a) Financial risk management Risk management, including the management on the financial risks, is carried out under the instructions of the Strategic Committee of Board of Directors and the Risk Management Team. The Company works out general principles for overall management as well as management policies covering specific areas. In considering the importance of risks, the Company identifies and evaluates risks at head office and individual power plant level, and requires analysis and proper communication of the information collected periodically. SinoSing Power and its subsidiaries are subject to financial risks that are different from the entities operating within the PRC. They have a series of controls in place to maintain the cost of risks occurring and the cost of managing the risks at an acceptable level. Management continually monitors the risk management process to ensure that an appropriate balance between risk and control is achieved. SinoSing Power and its subsidiaries have their written policies and financial authorization limits in place which are reviewed periodically. These financial authorization limits seek to mitigate and eliminate operational risks by setting approval thresholds required for entering into contractual obligations and investments. (i) Market risk (1) Foreign exchange risk Foreign exchange risk of the entities operating within the PRC primarily arises from loans denominated in foreign currencies of the Company and its subsidiaries. SinoSing Power and its subsidiaries are exposed to foreign exchange risk on bank balances, accounts receivable, other receivables and assets, accounts payable and other liabilities that are denominated primarily in US$, a currency other than Singapore dollar ("S$"), their functional currency. Please refer to Note 18, 19, 24, 27 and 35 for details. The Company and its subsidiaries manage exchange risk through closely monitoring interest and exchange market. As at 31 December 2017, if RMB had weakened/strengthened by 5% (2016: 5%) against US$ and 3% (2016: 3%) against EUR ("€") with all other variables constant, the Company and its subsidiaries would further recognize exchange loss/gain amounted RMB112 million (2016: RMB142 million) and RMB7million (2016: RMB9 million), respectively. The ranges of such sensitivity disclosed above were based on the observation on the historical trend of related exchange rates during the previous year under analysis. As at 31 December 2017, if S$ had weakened/strengthened by 10% (2016: 10%) against US$ with all other variables constant, the Company and its subsidiaries would further recognize exchange gain/loss amounted RMB30million (2016: exchange loss/gain RMB10 million). The ranges of such sensitivity disclosed above were based on the management's experience and forecast. SinoSing Power and its subsidiaries also are exposed to foreign exchange risk on fuel purchases that are denominated primarily in US$. They substantially hedge their estimated foreign currency exposure in respect of forecast fuel purchases over the following three months using primarily foreign currency contracts. (2) Price risk The available-for-sale financial assets of the Company and its subsidiaries are exposed to equity security price risk. Detailed information relating to the available-for-sale financial assets is disclosed in Note 10. The Company closely monitors the pricing trends in the open market in determining its long-term strategic stakeholding decisions. The Company and its subsidiaries are exposed to fuel price risk on fuel purchases. In particular, SinoSing Power and its subsidiaries use fuel oil swap to hedge against such a risk and designate them as cash flow hedges. Please refer to Note 14 for details. (3) Cash flow interest rate risk The interest rate risk of the Company and its subsidiaries primarily arises from long-term loans. Loans borrowed at variable rates expose the Company and its subsidiaries to cash flow interest rate risk. The exposures of these risks are disclosed in Note 24 to the financial statements. The Company and its subsidiaries have entered into interest rate swap agreements with banks to hedge against a portion of cash flow interest rate risk. As at 31 December 2017, if interest rates on RMB-denominated borrowings had been 50 basis points higher/lower with all other variables held constant, interest expense for the year would have been RMB789 million (2016: RMB520 million) higher/lower. If interest rates on US$-denominated borrowings had been 50 basis points higher/lower with all other variables held constant, interest expense for the year would have been RMB6 million (2016: RMB7 million) higher/lower. If interest rates on S$-denominated borrowings had been 100 basis points higher/lower with all other variables held constant, interest expense for the year would have been RMB72 million (2016: RMB59 million) higher/lower. The ranges of such sensitivity disclosed above were based on the observation on the historical trend of related interest rates during the previous year under analysis. The Company has entered into a floating-to-fixed interest rate swap agreement to hedge against cash flow interest rate risk of a loan. According to the interest rate swap agreement, the Company agrees with the counterparty to settle the difference between fixed contract rates and floating-rate interest amounts calculated by reference to the agreed notional amounts quarterly until 2019. Tuas Power Generation Pte. Ltd. ("TPG") also entered into a number of floating-to-fixed interest rate swap agreements to hedge against cash flow interest rate risk of a loan. According to the interest rate swap agreements, TPG agrees with the counterparty to settle the difference between fixed contract rates and floating-rate interest amounts calculated by reference to the agreed notional amount semi-annually until 2020. Please refer to Note 14 for details. (ii) Credit risk Credit risk arises from bank deposits, accounts receivable, other receivables and assets, available-for-sale financial assets and other non-current assets. The maximum exposures of available-for-sale financial assets, other non-current assets, other receivables and assets, accounts receivable and bank deposits are disclosed in Note 10, 16, 18, 19 and 35 to the financial statements, respectively. Bank deposits are placed with reputable banks and financial institutions. In addition, a significant portion is deposited with a non-bank financial institution which is a related party of the Company. The Company has a director on the Board of this non-bank financial institution and exercises influence. Corresponding maximum exposures of these bank deposits are disclosed in Note 36 (a)(i) to the financial statements. Most of the power plants of the Company and its subsidiaries operating within the PRC sell electricity generated to their sole customers, the power grid companies of their respective provinces or regions where the power plants operate. These power plants communicate with their individual grid companies periodically and believe that adequate provision for doubtful accounts have been made in the financial statements. Singapore subsidiaries derive revenue mainly from sale of electricity to the National Electricity Market of Singapore operated by Energy Market Company Pte. Ltd., which does not have high credit risk. Singapore subsidiaries also derive revenue mainly from retailing electricity to consumers with monthly consumption of more than 2,000kWh. These customers engage in a wide spectrum of manufacturing and commercial activities in a variety of industries. Singapore subsidiaries hold cash deposits of RMB161.37 million (2016: RMB175.86 million) and guarantees from creditworthy financial institutions as a security from these customers. (iii) Liquidity risk Liquidity risk management is to primarily ensure the ability of the Company and its subsidiaries to meet its liabilities as and when they are fall due. The liquidity reserve comprises the undrawn borrowing facility and cash and cash equivalents available as at each month end in meeting its liabilities. The Company and its subsidiaries maintain flexibility in funding by cash generated by their operating activities and availability of committed credit facilities. Financial liabilities due within 12 months are presented as current liabilities in the statement of financial position. The cash flows of derivative financial liabilities and repayment schedules of the long-term loans and long-term bonds are disclosed in Note 14, 24 and 25, respectively. (b) Fair value estimation (i) Fair value measurements The table below analyses financial instruments carried at fair value, by valuation method. The different levels have been defined as follows: • Level 1- Quoted prices (unadjusted) in active markets for identical assets or liabilities. • Level 2- Inputs other than quoted prices included within level 1 that are observable for the asset or liability, either directly (that is, as prices) or indirectly (that is, derived from prices). • Level 3- Inputs for the asset or liability that are not based on observable market data (that is, unobservable inputs). The following table presents the assets and liabilities that are measured at fair value at 31 December 2017. Level 1 Level 2 Level 3 Total Assets Financial assets at fair value through profit or loss - Trading derivatives (Note 14) - 2,726 - 2,726 - - - 859,547 859,547 Derivatives used for hedging (Note 14) - 330,966 - 330,966 Available-for-sale financial assets - Equity securities (Note 10) 9,223 - - 9,223 Total assets 9,223 333,692 859,547 1,202,462 Liabilities Financial liabilities at fair value through profit or loss - Trading derivatives (Note 14) - 125 - 125 Derivatives used for hedging (Note 14) - 210,539 - 210,539 Total liabilities - 210,664 - 210,664 The following table presents the assets and liabilities that are measured at fair value at 31 December 2016. Level 1 Level 2 Level 3 Total Assets Financial assets at fair value through profit or loss - Trading derivatives (Note 14) - 5,881 - 5,881 Derivatives used for hedging (Note 14) - 372,442 - 372,442 Available-for-sale financial assets - Equity securities (Note 10) 1,820,713 - - 1,820,713 Total assets 1,820,713 378,323 - 2,199,036 Liabilities Financial liabilities at fair value through profit or loss - Trading derivatives (Note 14) - 619 - 619 Derivatives used for hedging (Note 14) - 334,119 - 334,119 Total liabilities - 334,738 - 334,738 The fair value of financial instruments traded in active markets is based on quoted market prices at the end of reporting period. A market is regarded as active if quoted prices are readily and regularly available from an exchange, dealer, broker, industry group, pricing service, or regulatory agency, and those prices represent actual and regularly occurring market transactions on an arm's length basis. The quoted market price used for financial assets held by the Company and its subsidiaries is the current bid price. These instruments are included in level 1. As at 31 December 2017, instruments included in level 1 are equity instruments in listed securities classified as available for sale. The fair value of financial instruments that are not traded in an active market is determined by using valuation techniques. These valuation techniques maximize the use of relevant observable inputs and minimize the use of unobservable inputs. If all significant inputs required to fair value an instrument are observable, the instrument is included in level 2. If one or more of the significant inputs is not based on observable market data, the instrument is included in level 3. Specific valuation techniques used to value financial instruments include: • The forward exchange contracts and fuel oil swaps are both valued using quoted market prices or dealer quotes for similar instruments. • The fair value of interest rate swaps is calculated as the present value of the estimated future cash flows based on observable yield curves. • The contingent consideration is valued using discounted cash flow. The valuation model considers the present value of the expected future receivables discounted using a risk-adjusted discounted rate. The expected future contingent considerations are determined by considering the expected performance of acquired entities through 31 December 2019, representing the measurement period for contingent consideration Instruments included in level 2 comprise forward exchange contracts, fuel oil swaps and interest rate swaps. During the year ended 31 December 2017, there are no transfers of financial instruments between level 1 and level 2, or transfers into or out of level 3. The movements during the period in the balance of the Level 3 fair value measurements are as follows: 2017 Contingent consideration Beginning of the year - Movement: Gains on fair value changes 859,547 End of the year 859,547 Total gains for the period included in profit or loss for assets held at the end of the reporting period 859,547 (ii) Fair value disclosures The carrying value less provision for doubtful accounts of accounts receivable, other receivables and assets, accounts payable and other liabilities, short-term bonds and short-term loans approximated their fair values. The fair value of financial liabilities for disclosure purposes is estimated by discounting the future contractual cash flows at the current market interest rate that is available to the Company and its subsidiaries for similar financial instruments. The estimated fair value of long-term loans and long-term bonds (both including current maturities) was approximately RMB125.00 billion and RMB19.81billion as at 31 December 2017 (2016: RMB74.48 billion and RMB15.71 billion), respectively. The aggregate book value of these liabilities was approximately RMB125.13 billion and RMB19.99 billion as at 31 December 2017 (2016: RMB74.55 billion and RMB15.48 billion), respectively. (c) Capital risk management The objectives of the Company and its subsidiaries when managing capital are to safeguard the ability of the Company and its subsidiaries in continuing as a going concern in order to provide returns for shareholders and benefits for other stakeholders and to maintain an optimal capital structure to reduce the cost of capital. The Company and its subsidiaries monitor capital by using debt ratio analysis. This ratio is calculated as total liabilities (sum of current liabilities and non-current liabilities) divided by total assets as shown in the consolidated statement of financial position. During 2017, the strategy of the Company and its subsidiaries remained unchanged from 2016. The debt ratio of the Company and its subsidiaries as at 31 December 2017 was 72.86% (2016: 67.54%).

Critical accounting estimates a

Critical accounting estimates and judgments	12 Months Ended
	Dec. 31, 2017
Critical accounting estimates and judgments [abstract]
Critical accounting estimates and judgments	4 Critical accounting estimates and judgments Estimates and judgments are continually evaluated and are based on historical experience and other factors, including expectations of future events that are believed to be reasonable under the circumstances. The Company and its subsidiaries make estimates and assumptions concerning the future. The resulting accounting estimates will, by definition, seldom equal the related actual results. The estimates and assumptions that have a significant risk of causing a material adjustment to the carrying amounts of assets and liabilities within the next financial year are discussed below. (a) Accounting estimates on impairment of goodwill and power generation license The Company and its subsidiaries perform test annually whether goodwill and power generation license have suffered any impairment in accordance with the accounting policies stated in Note 2(j). The recoverable amounts of CGU or CGUs to which goodwill and the power generation license have been allocated are determined based on value-in-use calculations. These calculations require the use of estimates (Note 12 and 15). It is reasonably possible, based on existing knowledge, that outcomes within the next financial period that are different from assumptions could require a material adjustment to the carrying amounts of goodwill and power generation license.. For goodwill allocated to CGUs in the PRC, changes of assumptions in tariff and fuel price could have affected the results of goodwill impairment assessment. As at 31 December 2017, if tariff had decreased by 1% or 5% from management's estimates with other variables constant with the expectations, the Company and its subsidiaries would have to recognize impairment against goodwill by approximately RMB681 million and RMB3,879 million, respectively. If fuel price had increased by 1% or 5% from the management's estimates with other variables constant with the expectations, the Company and its subsidiaries would have to recognize impairment against goodwill by RMB320 million and RMB2,535 million, respectively. For the sensitivity analysis of power generation license and goodwill of Tuas Power, please refer to Note 12 and 15. (b) Useful life of power generation license As at year end, management of the Company and its subsidiaries assess whether the estimated useful life for its power generation license is indefinite. This assessment is based on the expected renewal of power generation license without significant restriction and cost, together with the consideration on related future cash flows generated and the expectation of continuous operations. Based on existing knowledge, outcomes within the next financial period that are different from assumptions could require a change to the carrying amount of power generation license. (c) Useful lives of property, plant and equipment Management of the Company and its subsidiaries determines the estimated useful lives of property, plant and equipment and respective depreciation. The accounting estimate is based on the expected wears and tears incurred during power generation. Wears and tears can be significantly different following renovation each time. When the useful lives differ from the original estimated useful lives, management will adjust the estimated useful lives accordingly. It is possible that the estimates made based on existing experience are different to the actual outcomes within the next financial period and could cause a material adjustment to the depreciation and carrying amount of property, plant and equipment. (d) Estimated impairment of other non-current assets The Company and its subsidiaries test whether property, plant and equipment, land use rights and mining rights suffered from impairment whenever an impairment indication exists. In accordance with Note 2(j), an impairment loss is recognized for the amount by which the carrying amount of the asset exceeds its recoverable amount. It is reasonably possible, based on existing knowledge, that outcomes within the next financial period that are different from assumptions could require a material adjustment to the carrying amount of property, plant and equipment, land use rights and mining rights. Changes of assumptions in tariff and fuel price will affect the result of property, plant and equipment, land use rights and mining rights impairment assessment. For power plants assets that are subject to impairment testing, as at 31 December 2017, if tariff had decreased by 1% or 5% from management's estimates with other variables constant with the expectations, the Company and its subsidiaries would have to further recognize impairment against property, plant and equipment and land use rights by approximately RMB165 million and RMB1,165 million, respectively. If fuel price had increased by 1% or 5% from the management's estimates with other variables constant with the expectations, the impairment against property, plant and equipment, land use rights and mining rights of the Company and its subsidiaries would increase totaling by approximately RMB45 million and RMB478 million, respectively. (e) Approval of construction of new power plants The receiving of the ultimate approvals from National Development and Reform Commission ("NDRC") on certain power plant construction projects of the Company and its subsidiaries is a critical estimate and judgment of the directors. Such estimates and judgments are based on initial approval documents received as well as their understanding of the projects. Based on historical experience, the directors believe that the Company and its subsidiaries will receive final approvals from NDRC on the related power plant projects. Deviation from the estimate and judgment could result in significant adjustment to the carrying amount of non-current assets. (f) Deferred tax assets The Company and its subsidiaries recognized the deferred tax assets to the extent that it is probable that future taxable profit will be available against which the asset can be utilized, using tax rates that are expected to be applied in the period when the asset is recovered. The management assesses the deferred tax assets based on the expected amount and timing of future taxable profit, the enacted tax laws and applicable tax rates. It is reasonably possible, based on existing knowledge, the outcomes within the next financial period that are different from assumptions could require a material adjustment to the carrying amount of deferred tax assets. (g) Business combination For the business combinations undertaken by the Company, the Company recognises the assets acquired and the liabilities assumed based on their estimated fair value on the date of acquisition. Any excess of purchase consideration over the estimated fair values of acquired identifiable net assets is recorded goodwill (Note 2(i)). The contingent consideration of the Company in the business combination is recognised as a financial asset at fair value through profit or loss (included in other non-current assets and other receivables and assets). The Company makes judgements and estimates in relation to the fair value of the assets acquired and the liabilities assumed and the contingent consideration from business combination. The fair value of acquired assets and assumed liabilities and the contingent consideration are determined using valuation techniques. Estimating the fair value assigned to each class of acquired assets and assumed liabilities and the contingent consideration are based on expectations and assumptions, in particular in relation to the future sales volumes and the related revenue growth rate, future on-grid tariffs, future capital expenditure, future fuel prices, future other operating costs and the discount rates applied. A change in the amount allocated to identifiable net assets would have an offsetting effect on the amount of goodwill recognised from the acquisition and would change the amount of depreciation and amortisation expense recognised related to those identifiable net assets. And outcomes within the next financial period that are different from assumptions could require a material adjustment to the carrying amounts of contingent consideration.

Revenue and segment information

Revenue and segment information	12 Months Ended
	Dec. 31, 2017
Revenue and segment information [abstract]
Revenue and segment information	5 Revenue and segment information Revenues recognized during the year are as follows: For the year ended 31 December 2017 2016 2015 Sales of power and heat 148,925,442 112,794,536 127,849,408 Sales of coal 1,143,299 2,909 6,839 Port service 232,360 237,347 211,685 Transportation service 73,830 105,505 104,721 Others 2,084,513 673,939 732,220 Total 152,459,444 113,814,236 128,904,873 Directors and certain senior management of the Company perform the function as the chief operating decision maker (collectively referred to as the "senior management"). The senior management reviews the internal reporting of the Company and its subsidiaries in order to assess performance and allocate resources. The Company has determined the operating segments based on these reports. The reportable segments of the Company are the PRC power segment, Singapore segment and all other segments (mainly including port and transportation operations). No operating segments have been aggregated to form a reportable segment. Senior management assesses the performance of the operating segments based on a measure of profit before income tax expense under China Accounting Standard for Business Enterprises ("PRC GAAP") excluding dividend income received from available-for-sale financial assets, gains on disposal of available-for-sale financial assets and operating results of the centrally managed and resource allocation functions of headquarters ("Segment results"). Other information provided, except as noted below, to the senior management of the Company is measured under PRC GAAP. Segment assets exclude prepaid income tax, deferred income tax assets, available-for-sale financial assets and assets related to the centrally managed and resource allocation functions of headquarters that are not attributable to any operating segment ("corporate assets"). Segment liabilities exclude current income tax liabilities, deferred income tax liabilities and liabilities related to the centrally managed and resource allocation functions of headquarters that are not attributable to any operating segment ("corporate liabilities"). These are part of the reconciliation to total assets and liabilities of consolidated statement of financial position. All sales among the operating segments have been eliminated as internal transactions when preparing consolidated financial statements. (Under PRC GAAP) PRC power segment Singapore segment All other segments Total For the year ended 31 December 2017 Total revenue 142,067,629 10,078,031 694,405 152,840,065 Inter-segment revenue - - (380,621 ) (380,621 ) Revenue from external customers 142,067,629 10,078,031 313,784 152,459,444 Segment results 2,417,073 (577,458 ) 302,191 2,141,806 Interest income 126,927 70,756 1,223 198,906 Interest expense (9,026,064 ) (450,928 ) (145,112 ) (9,622,104 ) Impairment loss (1,167,751 ) (994 ) (19,742 ) (1,188,487 ) Depreciation and amortization (18,081,299 ) (856,979 ) (189,764 ) (19,128,042 ) Net loss on disposal of non-current assets (580,345 ) (995 ) (3 ) (581,343 ) Share of profits less losses of associates and joint ventures (7,318 ) - 307,923 300,605 Income tax expense (1,667,234 ) 99,150 (5,386 ) (1,573,470 ) (Under PRC GAAP) PRC power segment Singapore segment All other segments Total For the year ended 31 December 2016 (Restated*) Total revenue 129,101,375 8,758,822 634,965 138,495,162 Inter-segment revenue - - (344,866 ) (344,866 ) Revenue from external customers 129,101,375 8,758,822 290,099 138,150,296 Segment results 17,633,734 (282,703 ) (38,433 ) 17,312,598 Interest income 102,265 69,672 623 172,560 Interest expense (7,952,640 ) (481,263 ) (137,825 ) (8,571,728 ) Impairment (loss)/reversal (1,410,733 ) 899 (8,475 ) (1,418,309 ) Depreciation and amortization (17,320,753 ) (778,426 ) (203,493 ) (18,302,672 ) Net loss on disposal of non-current assets (693,091 ) (172 ) (14,303 ) (707,566 ) Share of profits less losses of associates and joint ventures 973,982 - 73,415 1,047,397 Income tax expense (4,610,591 ) 44,135 57,489 (4,508,967 ) For the year ended 31 December 2015 (Restated*) Total revenue 143,679,910 10,143,793 588,266 154,411,969 Inter-segment revenue - - (266,701 ) (266,701 ) Revenue from external customers 143,679,910 10,143,793 321,565 154,145,268 Segment results 27,473,279 (313,253 ) (232,956 ) 26,927,070 Interest income 115,378 66,898 501 182,777 Interest expense (9,526,290 ) (452,034 ) (163,325 ) (10,141,649 ) Impairment (loss)/reversal (3,112,370 ) 1,744 (178,131 ) (3,288,757 ) Depreciation and amortization (16,719,037 ) (772,003 ) (245,936 ) (17,736,976 ) Net (loss)/gain on disposal of non-current assets (517,820 ) 22,450 (1 ) (495,371 ) Share of profits less losses of associates and joint ventures 1,247,293 - 18,247 1,265,540 Income tax expense (7,121,207 ) 254,772 14,397 (6,852,038 ) (Under PRC GAAP) PRC power segment Singapore segment All other segments Total 31 December 2017 Segment assets 334,379,104 27,817,680 9,978,885 372,175,669 Including: Additions to non-current assets (excluding financial assets and deferred income tax assets) 24,447,658 260,240 328,061 25,035,959 Investments in associates 12,577,836 - 2,919,860 15,497,696 Investments in joint ventures 1,457,247 - 1,025,534 2,482,781 Segment liabilities (264,115,887 ) (14,000,442 ) (3,026,229 ) (281,142,558 ) 31 December 2016 (Restated*) Segment assets 331,939,958 28,141,718 11,789,504 371,871,180 Including: Additions to non-current assets (excluding financial assets and deferred income tax assets) 27,430,205 230,974 854,484 28,515,663 Investments in associates 12,527,711 - 2,880,368 15,408,079 Investments in joint ventures 2,202,002 - 790,610 2,992,612 Segment liabilities (246,200,555 ) (14,027,606 ) (5,620,515 ) (265,848,676 ) A reconciliation of revenue from external customers to operating revenue is provided as follows: For the year ended 31 December 2017 2016(Restated*) 2015(Restated*) Revenue from external customers (PRC GAAP) 152,459,444 138,150,296 154,145,268 Reconciling item: Impact of restatement under PRC GAAP in relation to business combination under common control*(Note 40) - (24,336,060 ) (25,240,395 ) Operating revenue per IFRS consolidated statement of comprehensive income 152,459,444 113,814,236 128,904,873 A reconciliation of segment result to profit before income tax expense is provided as follows: For the year ended 31 December 2017 2016(Restated*) 2015(Restated*) Segment results (PRC GAAP) 2,141,806 17,312,598 26,927,070 Reconciling items: Loss related to the headquarter (170,210 ) (699,054 ) (327,262 ) Investment income from China Huaneng Finance Co., Ltd. ("Huaneng Finance") 143,794 132,018 135,971 Dividend income of available-for-sale financial assets 124,918 105,337 99,071 Gains on disposal of available-for-sale financial asset 1,479,732 932,738 4,282 Impact of restatement under PRC GAAP in relation to business combination under common control*(Note 40) - (3,417,300 ) (3,454,005 ) Impact of other IFRS adjustments** (918,307 ) (553,199 ) (427,077 ) Profit before income tax expense per IFRS consolidated statement of comprehensive income 2,801,733 13,813,138 22,958,050 Reportable segments' assets are reconciled to total assets as follows: As at 31 December 2017 2016(Restated*) Total segment assets (PRC GAAP) 372,175,669 371,871,180 Reconciling items: Investment in Huaneng Finance 1,336,777 1,314,603 Deferred income tax assets 2,980,303 2,447,648 Prepaid income tax 150,838 204,182 Available-for-sale financial assets 1,654,993 3,560,928 Corporate assets 395,148 360,854 Impact of restatement under PRC GAAP in relation to business combination under common control * (Note 40) - (70,341,769 ) Impact of other IFRS adjustments** 17,895,783 5,422,113 Total assets per IFRS consolidated statement of financial position 396,589,511 314,839,739 Reportable segments' liabilities are reconciled to total liabilities as follows: As at 31 December 2017 2016(Restated*) Total segment liabilities (PRC GAAP) (281,142,558 ) (265,848,676 ) Reconciling items: Current income tax liabilities (430,703 ) (572,515 ) Deferred income tax liabilities (1,283,950 ) (1,429,859 ) Corporate liabilities (3,632,847 ) (4,717,617 ) Impact of restatement under PRC GAAP in relation to business combination under common control * (Note 40) - 59,917,072 Impact of other IFRS adjustments** (2,484,849 ) (1,407 ) Total liabilities per IFRS consolidated statement of financial position (288,974,907 ) (212,653,002 ) Other material items: Reportable segment total Headquarters Investment income from Huaneng Finance Impact of restatement under PRC GAAP in relation to business combination under common control Impact of other IFRS adjustments** Total For the year ended 31 December 2017 Total revenue 152,459,444 - - - - 152,459,444 Interest expense (9,622,104 ) (126,900 ) - - - (9,749,004 ) Depreciation and amortization (19,128,042 ) (38,819 ) - - (1,468,972 ) (20,635,833 ) Impairment loss (1,188,487 ) - - - 1,275 (1,187,212 ) Share of profits less losses of associates and joint ventures 300,605 - 143,794 - (19,184 ) 425,215 Net (loss)/gain on disposal of non-current assets (581,343 ) 3,174 - - (38,287 ) (616,456 ) Income tax expense (1,573,470 ) - - - 355,944 (1,217,526 ) For the year ended 31 December 2016 (Restated*) Total revenue 138,150,296 - - (24,336,060 ) - 113,814,236 Interest expense (8,571,728 ) (131,244 ) - 1,885,446 - (6,817,526 ) Depreciation and amortization (18,302,672 ) (48,934 ) - 3,533,820 (344,929 ) (15,162,715 ) Impairment loss (1,418,309 ) - - 213,351 - (1,204,958 ) Share of profits less losses of associates and joint ventures 1,047,397 - 132,018 133,694 (14,220 ) 1,298,889 Net loss on disposal of non-current assets (707,566 ) (14 ) - 115,769 1,762 (590,049 ) Income tax expense (4,508,967 ) - - 928,854 114,962 (3,465,151 ) For the year ended 31 December 2015 (Restated*) Total Revenue 154,145,268 - - (25,240,395 ) - 128,904,873 Interest expense (10,141,649 ) (149,259 ) - 2,345,174 - (7,945,734 ) Depreciation and amortization (17,736,976 ) (60,236 ) - 3,474,072 (394,473 ) (14,717,613 ) Impairment loss (3,288,757 ) - - 198,604 - (3,090,153 ) Share of profits less losses of associates and joint ventures 1,265,540 - 135,971 180,447 (55,983 ) 1,525,975 Net loss on disposal of non-current assets (495,371 ) (6 ) - 90,534 (33,478 ) (438,321 ) Income tax expense (6,852,038 ) - - 1,016,588 136,507 (5,698,943 ) * The Company completed the acquisition of equity interests of four companies from Huaneng Group, see Note 40 for details. As the acquisition is a business combination under common control, the transaction is accounted for under merger accounting method under PRC GAAP. The assets and liabilities acquired in business combinations are measured at the carrying amounts of the acquirees in the consolidated financial statements of the ultimate controlling party on the acquisition date. The operating results for all periods presented are retrospectively restated as if the current structure and operations resulting from the acquisition had been in existence from the date when the acquirees first became under the control of the same ultimate controlling party. Therefore the relevant comparative figures in the segment information were restated under PRC GAAP while the acquisition is accounted for using acquisition method under IFRS. ** Other GAAP adjustments above primarily represented the classification adjustments and other adjustments. Other than the classification adjustments, the differences will be gradually eliminated following subsequent depreciation and amortization of related assets or the extinguishment of liabilities. Geographical information (Under IFRS): (i) External revenue generated from the following countries: For the year ended 31 December 2017 2016 2015 PRC 142,381,413 105,055,414 118,761,080 Singapore 10,078,031 8,758,822 10,143,793 Total 152,459,444 113,814,236 128,904,873 The geographical location of customers is based on the location at which the electricity was transferred, goods were delivered and services provided. (ii) Non-current assets (excluding financial assets and deferred income tax assets) are located in the following countries: As at 31 December 2017 2016 PRC 319,534,533 249,155,921 Singapore 23,035,758 23,369,766 Total 342,570,291 272,525,687 The information on sales to major customers of the Company and its subsidiaries at amount equal to or more than 10% of external revenue is as follows: In 2017, the revenue from grid companies under common control of State Grid Corporation of China within PRC power segment in total accounted for 76% of external revenue (2016: 74%, 2015: 81%). The sales from a subsidiary of State Grid Corporation of China at amount more than 10% of external revenue is as follows: For the year ended 31 December 2017 2016 2015 Amount Proportion Amount Proportion Amount Proportion State Grid Shandong Electric Power Company 28,659,891 19 % 12,649,224 11 % 14,855,655 12 %

Profit before income tax expens

Profit before income tax expense	12 Months Ended
	Dec. 31, 2017
Profit before income tax expense [abstract]
Profit before income tax expense	6 Profit before income tax expense Profit before income tax expense was determined after charging/(crediting) the following: For the year ended 31 December 2017 2016 2015 Total interest expense on borrowing 10,225,069 7,267,490 8,716,074 Less: amounts capitalized in property, plant and equipment 476,065 449,964 770,340 Interest expenses charged in consolidated statement of comprehensive income 9,749,004 6,817,526 7,945,734 Auditors' remuneration-audit services 64,160 43,610 41,640 Operating leases charge 364,756 331,496 313,723 Fuel 92,737,304 56,617,542 59,242,367 Depreciation of property, plant and equipment 20,180,830 14,815,620 14,411,632 Amortization of land use rights 341,125 225,707 213,206 Amortization of other non-current assets 113,878 121,388 92,775 Impairment loss of property, plant and equipment (Note 7) 1,046,195 1,063,735 1,047,641 Impairment loss of land use rights (Note 11) 108,590 51,981 - Impairment loss of investment in an associate - - 178,131 Impairment loss of mining rights - - 760,296 Impairment loss of goodwill - - 1,105,649 Impairment loss of other non-current assets 5,008 - - Recognition/(reversal) of provision for doubtful accounts 27,682 89,498 (3,392 ) (Reversal)/recognition of provision for inventory obsolescence (263 ) (256 ) 1,828 Net loss on disposals of non-current assets 616,456 590,049 438,321 Government grants (421,912 ) (396,467 ) (696,735 ) Gain on a bargain purchase - (129,921 ) - Included in other investment income -Gains on disposal of available-for-sale financial asset (Note 10) (1,479,732 ) (932,738 ) - -Dividends on available-for-sale financial assets (124,918 ) (103,037 ) (97,696 ) -Gains on disposal of subsidiaries* (52,330 ) - - Included in (gain)/loss on fair value changes of financial assets/liabilities -Contingent consideration of the business combination (Note 40) (859,547 ) - - -Loss on fair value changes of trading derivatives 2,761 12,986 16,762 * For the disposals of Taishan Power Limited Company and Huaneng (Fujian) Harbour Limited Company with no interest being retained. The Company received consideration of RMB781 million and RMB222 Million respectively. The investment income of 52 million was recognized and the related non-controlling interests of RMB681 million and RMB186 million with the subsidiaries were derecognized. Other operating expenses consist of impairment loss of property, plant and equipment, land use rights and other non-current assets, environmental protection expenses, substituted power arrangement expenses, insurance, gain on a bargain purchase, government grants and other miscellaneous expenses.

Property, plant and equipment

Property, plant and equipment	12 Months Ended
	Dec. 31, 2017
Property, plant and equipment [abstract]
Property, plant and equipment	7 Property, plant and equipment Dam Port facilities Buildings Electric utility plant in service Transport-ation facilities Others CIP Total As at 1 January 2016 Cost 1,856,144 3,860,009 8,306,471 327,827,738 980,290 5,809,400 23,851,697 372,491,749 Accumulated depreciation (153,325 ) (436,215 ) (2,508,772 ) (138,852,591 ) (371,226 ) (3,366,838 ) - (145,688,967 ) Accumulated impairment loss (268,981 ) - (68,931 ) (5,968,962 ) - (81,328 ) (741,510 ) (7,129,712 ) Net book value 1,433,838 3,423,794 5,728,768 183,006,185 609,064 2,361,234 23,110,187 219,673,070 Year ended 31 December 2016 Beginning of the year 1,433,838 3,423,794 5,728,768 183,006,185 609,064 2,361,234 23,110,187 219,673,070 Reclassification - 1,771 (492,558 ) 495,841 759 (5,813 ) - - Business combination - - 8,098 303,854 - 2,977 4,576 319,505 Additions - 1,770 127 418,812 - 122,519 18,839,102 19,382,330 Transfer from CIP 20,170 246,712 1,319,019 12,576,736 20,033 296,648 (14,479,318 ) - Disposals/write-off - - (68,945 ) (495,251 ) (26,477 ) (27,055 ) (193,357 ) (811,085 ) Depreciation charge (32,987 ) (113,810 ) (255,882 ) (14,004,881 ) (48,720 ) (387,884 ) - (14,844,164 ) Impairment charge (41,423 ) - (2,303 ) (1,005,367 ) - (6,399 ) (8,243 ) (1,063,735 ) Currency translation differences - - - 404,948 - 782 158 405,888 End of the year 1,379,598 3,560,237 6,236,324 181,700,877 554,659 2,357,009 27,273,105 223,061,809 As at 31 December 2016 Cost 1,876,314 4,116,914 9,056,858 341,195,395 875,630 6,041,783 28,022,858 391,185,752 Accumulated depreciation (186,312 ) (556,677 ) (2,749,300 ) (152,408,524 ) (320,971 ) (3,596,546 ) - (159,818,330 ) Accumulated impairment loss (310,404 ) - (71,234 ) (7,085,994 ) - (88,228 ) (749,753 ) (8,305,613 ) Net book value 1,379,598 3,560,237 6,236,324 181,700,877 554,659 2,357,009 27,273,105 223,061,809 Year ended 31 December 2017 Beginning of the year 1,379,598 3,560,237 6,236,324 181,700,877 554,659 2,357,009 27,273,105 223,061,809 Reclassification 49,386 (404 ) 52,047 (157,759 ) (4,357 ) 61,087 - - Business combination (Note 40) 279,169 - 1,944,531 58,379,270 17,243 443,052 2,717,544 63,780,809 Additions - - 184 840,991 - 88,160 21,225,980 22,155,315 Transfer from CIP 15,355 114,688 342,285 20,283,508 288,554 145,705 (21,190,095 ) - Disposals/write-off - (14,731 ) (30,837 ) (1,252,829 ) (3,907 ) (28,562 ) - (1,330,866 ) Disposal of subsidiaries - (632,709 ) (101,169 ) (114,542 ) - (153,096 ) (1,242,210 ) (2,243,726 ) Depreciation charge (40,200 ) (111,529 ) (339,630 ) (19,155,852 ) (59,022 ) (494,932 ) - (20,201,165 ) Impairment charge (45,619 ) - (1,651 ) (754,753 ) - (2,503 ) (241,669 ) (1,046,195 ) Currency translation differences - - - 151,249 - 263 600 152,112 End of the year 1,637,689 2,915,552 8,102,084 239,920,160 793,170 2,416,183 28,543,255 284,328,093 As at 31 December 2017 Cost 2,220,224 3,358,811 11,173,669 418,360,698 1,155,392 5,972,688 29,534,677 471,776,159 Accumulated depreciation (226,512 ) (443,259 ) (3,019,198 ) (170,525,898 ) (362,222 ) (3,523,292 ) - (178,100,381 ) Accumulated impairment loss (356,023 ) - (52,387 ) (7,914,640 ) - (33,213 ) (991,422 ) (9,347,685 ) Net book value 1,637,689 2,915,552 8,102,084 239,920,160 793,170 2,416,183 28,543,255 284,328,093 Interest capitalization Interest expense of approximately RMB476 million (2016: RMB450 million) arising on borrowings for the construction of property, plant and equipment was capitalized during the year and was included in 'Additions' in property, plant and equipment. The weighted average capitalization rate was approximately 4.54% (2016: 4.52%) per annum. Impairment In 2017, impairment losses for certain property, plant and equipment and land use rights of approximately RMB1,046 million and RMB109 million have been recognized, respectively. Factors leading to the impairment include lower than expected utilization hours of a subsidiary due to long idle hours of its power generating units and the coal-fire projects in progress was aborted; lower than expected operating results of three subsidiaries in 2017 due to oversupply and fierce competition within the electricity market in the provinces, as well as low profitability of a hydropower plant, a coal-fire project in progress of a subsidiary was aborted as a result of relevant regulation. Discount rates of 9.50%, 9.98%, 9.89%, 14.74% and 9.14% were adopted in the value in use model in the determination of the recoverable amounts for the four coal-fired power plants and the hydropower plant respectively. In addition, as a result of the low demand of coal-fired power in local market, management estimated the possibility of further development of a coal-fired power project was remote, therefore the project under construction with a carrying value of RMB242 million was fully impaired in 2017. In 2016, impairment losses for certain property, plant and equipment and land use rights of approximately RMB1,064 million and RMB52 million have been recognized, respectively. Factors leading to the impairment of operating projects primarily included lower utilization hours and tariff of two coal-fired power plants as a result of over supply of electricity in two provinces, as well as low utilization hours of a hydropower plant as a result of low level of water inflow. Discount rates of 8.06%, 8.97% and 8.12% were adopted in the value in use model in the determination of the recoverable amounts for the two coal-fired power plants and the hydropower plant respectively. Property, plant and equipment held under finance leases As at 31 December 2017, certain property, plant and equipment with original cost of RMB3,312 million (2016: RMB2,075 million) were held under finance leases, which mainly included power generation assets, ships and pipeline assets. Security As at 31 December 2017, certain property, plant and equipment were secured to a bank as collateral against a long-term loan (Note 24). Buildings without ownership certificate At 31 December 2017, the Company and its subsidiaries were in the process of applying for the ownership certificate for certain buildings (buildings for power generation process were included in electric utility plant in service) with an aggregate net book value of RMB10,800 million (2016: RMB7,871 million). The management are of the opinion that the Company and its subsidiaries are entitled to lawfully and validly occupy and use of the above mentioned buildings.

Investments in associates and j

Investments in associates and joint ventures	12 Months Ended
	Dec. 31, 2017
Investments in associates and joint ventures [abstract]
Investments in associates and joint ventures	8 Investments in associates and joint ventures 2017 2016 Beginning of the year 19,632,113 19,745,192 Capital injections in associates and joint ventures 301,916 276,118 Business combination (Note 40(a)) 1,021,566 - Transfer from available-for-sale 91,800 - Transfer to subsidiaries (736,725 ) - Share of net profit less loss 425,215 1,298,889 Share of other comprehensive income/(loss) 121,208 (180,572 ) Currency translation differences (142,226 ) - Dividends (835,279 ) (1,507,514 ) Elimination of unrealized profits on transactions with equity-method investees (361,965 ) - End of the year 19,517,623 19,632,113 As at 31 December 2017, investments in associates and joint ventures of the Company and its subsidiaries are unlisted except for Shenzhen Energy Corporation Limited ("SECL") which is listed on the Shenzhen Stock Exchange. The following list contains only the particulars of material associates and joint ventures: Name Country of incorporation Registered capital Business nature and scope of operation Percentage of equity interest held Direct Indirect 1 Associates: SECL* PRC RMB2,642,994,398 Energy and investment in related industries 25.02% - Hebei Hanfeng Power Generation Limited Liability Company ("Hanfeng Power") PRC RMB1,975,000,000 Power generation 40% - Huaneng Finance PRC RMB5,000,000,000 Provision for financial service including fund deposit services, lending, finance lease arrangements, notes discounting and entrusted loans and investment arrangement within Huaneng Group 20% - Huaneng Sichuan Hydropower Co., Ltd. ("Sichuan Hydropower") PRC RMB1,469,800,000 Development, investment, construction, operation and management of hydropower 49% - China Huaneng Group Fuel Co., Ltd. ("Huaneng Group Fuel Company") ** PRC RMB3,000,000,000 Wholesale of coal, import and export of coal 50% - Hainan Nuclear Power Limited Liability Company("Hainan Nuclear") PRC RMB4,831,460,000 Construction and operation of nuclear power plants; production and sales of electricity and related products 30% - Joint ventures: Shanghai Time Shipping Co., Ltd. ("Shanghai Time Shipping") PRC RMB1,200,000,000 International and domestic sea transportation 50% - Jiangsu Nantong Power Generation Co., Ltd.("Jiangsu Nantong Power") PRC RMB1,596,000,000 Operation and Management of power generation plants and transportation related projects - 35% Huaneng Shandong Ruyi (Hongkong) Energy Co., Ltd ("Ruyi (Hongkong) Energy")*** Hong Kong 10,000 Shares Investment in electricity and other related energy projects - 40% Shandong Luyi Power International Limited Company ("Luyi Power")*** PRC RMB35,000,000 Contracting overseas projects and international bidding projects, mechanical and electrical equipment installation engineering and electric power engineering - 40% 1 The indirect percentage of equity interest held represents the effective ownership interest of the Company and its subsidiaries. * As at 31 December 2017, the fair value of the Company's shares in SECL was RMB6,010 million (2016: RMB6,813 million). ** In accordance with the articles of the association of the investee, the Company could only exercise significant influence on the investee and therefore accounts for the investment under the equity method. *** Ruyi (Hongkong) Energy and Luyi Power were established for Pakistan Sahiwal Project, which are jointly controlled by Huaneng Shandong Power Generation Co., Ltd. and Shandong Ruyi Technology Group Co., Ltd. All the above associates and joint ventures are accounted for under the equity method in the consolidated financial statements. Summarized financial information of the material associates, adjusted for any differences in accounting policies and acquisition adjustments, and reconciliation to the carrying amounts in the consolidated financial statements, are disclosed below: Sichuan Hydropower SECL Huaneng Finance Hanfeng Power Huaneng Group Fuel Company Hainan Nuclear 2017 2016 2017 2016 2017 2016 2017 2016 2017 2016 2017 2016 Gross amounts of the associates' Current assets 1,113,579 1,245,157 16,444,934 14,021,440 25,535,504 13,919,342 650,055 806,432 4,327,146 4,642,797 2,497,765 2,608,909 Non-current assets 14,590,921 14,676,021 56,079,321 46,584,060 20,786,497 18,055,386 2,246,412 2,616,639 4,102,426 4,269,520 22,490,989 23,939,921 Current liabilities (2,477,362 ) (2,410,462 ) (20,447,190 ) (16,564,310 ) (39,588,213 ) (25,344,346 ) (795,815 ) (1,045,876 ) (1,778,075 ) (1,939,210 ) (3,409,360 ) (3,330,581 ) Non-current liabilities (8,661,852 ) (8,901,599 ) (28,491,540 ) (19,395,060 ) (49,904 ) (57,368 ) (27,443 ) (37,103 ) (3,119,462 ) (3,432,326 ) (17,252,794 ) (18,356,288 ) Equity 4,565,286 4,609,117 23,585,525 24,646,130 6,683,884 6,573,014 2,073,209 2,340,092 3,532,035 3,540,781 4,326,600 4,861,961 -Equity attributable to shareholders 3,400,953 3,449,824 22,285,077 21,610,140 6,683,884 6,573,014 2,073,209 2,340,092 3,400,344 3,378,952 4,326,600 4,861,961 -Non-controlling interests 1,164,333 1,159,293 1,300,448 3,035,990 - - - - 131,691 161,829 - - Revenue 2,247,781 2,053,327 13,908,949 11,427,830 1,393,211 1,093,637 2,073,209 2,192,445 17,166,036 14,356,915 2,504,379 1,897,190 Profit/(loss) from continuing operations attributable to shareholders 222,403 173,220 747,657 1,362,028 718,970 660,089 52,361 290,470 48,876 102,363 (535,361 ) 18,618 Other comprehensive (loss)/income attributable to shareholders - - 521,965 (638,680 ) (28,099 ) (125,840 ) - - (6,654 ) 8,723 - - Total comprehensive income/(loss) attributable to shareholders 222,403 173,220 1,269,622 723,348 690,871 534,249 52,361 290,470 42,222 111,086 (535,361 ) 18,618 Dividend received from the associates 132,923 145,392 148,761 198,348 116,000 122,000 127,698 174,366 10,000 10,000 - - Reconciled to the interests in the associates Gross amounts of net assets attributable to shareholders of the associate 3,400,953 3,449,824 22,285,077 21,610,140 6,683,884 6,573,014 2,073,209 2,340,092 3,400,344 3,378,952 4,326,600 4,861,961 The Company's effective interest 49 % 49 % 25.02 % 25.02 % 20 % 20 % 40 % 40 % 50 % 50 % 30 % 30 % The Company's share of net assets attributable to shareholders of the associate 1,666,467 1,690,414 5,574,612 5,405,776 1,336,777 1,314,603 829,284 936,037 1,700,172 1,689,476 1,297,980 1,458,588 Impact of adjustments 207,586 207,586 1,161,810 1,161,810 - - 293,082 293,082 16,521 16,521 14,076 14,076 Carrying amount in the consolidated financial statements 1,874,053 1,898,000 6,736,422 6,567,586 1,336,777 1,314,603 1,122,366 1,229,119 1,716,693 1,705,997 1,312,056 1,472,664 Summarized financial information of material joint ventures adjusted for any differences in accounting policies and acquisition adjustment, and reconciliation to the carrying amount in the consolidated financial statements, are disclosed below: Shanghai Time Shipping Jiangsu Nantong Power Pakistan Sahiwal Project Related Investment 2017 2016 2017 2016 2017 Gross amounts of joint ventures' Current assets 665,410 883,120 656,720 815,359 3,069,065 Non-current assets 4,663,530 5,335,409 5,739,860 6,075,100 9,775,693 Current liabilities (3,316,709 ) (3,177,881 ) (2,939,371 ) (2,600,258 ) (1,955,211 ) Non-current liabilities (617,437 ) (1,506,076 ) (1,374,656 ) (1,931,219 ) (8,738,121 ) Equity 1,394,794 1,534,572 2,082,553 2,358,982 2,151,426 Included in the above assets and liabilities: Cash and cash equivalents 96,528 203,018 362,214 96,501 618,105 Current financial liabilities (excluding trade and other payables and provisions) (2,987,937 ) (2,681,857 ) (2,404,331 ) (2,270,601 ) (1,482,269 ) Non-current financial liabilities (excluding trade and other payables and provisions) (617,437 ) (1,506,076 ) (1,352,000 ) (1,931,219 ) (8,738,121 ) Revenue 3,532,065 3,561,091 3,451,983 3,354,545 2,321,510 (Loss)/profit from continuing operations (139,780 ) 1,212 271,364 608,660 (72,227 ) Other comprehensive loss - - - - (284,452 ) Total comprehensive (loss)/income (139,780 ) 1,212 271,364 608,660 (356,679 ) Dividend received in cash from the joint ventures - 275,000 724,453 - - Included in the above profit: Depreciation and amortization 317,133 340,826 396,500 393,221 63,122 Interest income 1,406 985 1,810 2,313 10 Interest expense 157,851 149,748 130,028 128,224 104,467 Income tax expense (45,741 ) 500 92,294 194,915 224,146 Reconciled to the interest in the joint venture: Gross amounts of net assets 1,394,794 1,534,572 2,082,553 2,358,982 2,151,426 The Company and its subsidiaries' effective interest 50 % 50 % 50 % 50 % 50 % The Company and its subsidiaries' share of net assets 697,397 767,286 1,041,277 1,179,491 1,075,713 Impact of adjustments 18,324 18,324 - - (361,965 ) Carrying amount in the consolidated financial statements 715,721 785,610 1,041,277 1,179,491 713,748 Aggregate information of associates and joint ventures that are not individually material: 2017 2016 Aggregate carrying amount of individually immaterial associates and joint ventures in the consolidated financial statements 2,948,510 3,479,043 Aggregate amounts of the Company and its subsidiaries' share of those associates and joint ventures 70,965 263,392 Total comprehensive income 70,965 263,392 As at 31 December 2017, the Company's share of losses of an associate and a joint venture exceeded its interest in the associate and the joint venture and the unrecognized further losses amounted to RMB185 million (2016: RMB163 million).

Investments in subsidiaries

Investments in subsidiaries	12 Months Ended
	Dec. 31, 2017
Investments in subsidiaries [abstract]
Investments in subsidiaries	9 Investments in subsidiaries As at 31 December 2017, the investments in subsidiaries of the Company and its subsidiaries, all of which are unlisted, are as follows: (i) Subsidiaries acquired through establishment or investment Name of subsidiary Country of incorporation Type of interest held Registered capital Business nature and scope of operations Percentage of equity interest held Interest Voting Huaneng International Power Fuel Limited Liability Company PRC held directly RMB 200,000,000 Wholesale of coal 100% 100% Huaneng Shanghai Shidongkou Power Generation Limited Liability Company ("Shidongkou Power")(i) PRC held directly RMB 1,179,000,000 Power generation 50% 100% Huaneng Nantong Power Generation Limited Liability Company PRC held directly RMB 798,000,000 Power generation 70% 70% Huaneng Yingkou Co-generation Limited Liability Company PRC held directly RMB 844,030,000 Production and sales of electricity and heat sale of coal ash and lime 100% 100% Huaneng Hunan Xiangqi Hydropower Co., Ltd. PRC held directly RMB 328,000,000 Construction, operation and management of hydropower plants and related projects 100% 100% Huaneng Zuoquan Coal-fired Power Generation Limited Liability Company PRC held directly RMB 960,000,000 Construction, operation and management of electricity projects; Development and utilization of clean energy resources 80% 80% Huaneng Kangbao Wind Power Utilization Limited Liability Company PRC held directly RMB 407,200,000 Construction, operation and management of wind power plants and related projects; solar power generation 100% 100% Huaneng Jiuquan Wind Power Generation Co., Ltd. PRC held directly RMB 2,600,000,000 Construction, operation and management of wind power generation and related projects 100% 100% Huaneng Jiuquan II Wind Power Generation Co., Ltd. PRC held directly RMB 10,000,000 Construction, operation and management of wind power generation and related projects 100% 100% Huaneng Wafangdian Wind Power Generation Co., Ltd. PRC held directly RMB 50,000,000 Construction, operation and management of wind power generation and related projects 100% 100% Huaneng Changtu Wind Power Generation Co., Ltd. PRC held directly RMB 50,000,000 Construction, operation and management of wind power generation and related projects 100% 100% Huaneng Rudong Wind Power Generation Co., Ltd. PRC held directly RMB 90,380,000 Operation, management of wind power generation projects 90% 90% Huaneng Guangdong Haimen Port Limited Liability Company PRC held directly RMB 331,400,000 Loading, warehousing and conveying services, providing facility services and water transportation services 100% 100% Huaneng Taicang Port Limited Liability Company PRC held directly RMB 600,000,000 Port provision, cargo loading and storage 85% 85% Name of subsidiary Country of incorporation Type of interest held Registered capital Business nature and scope of operations Percentage of equity interest held Interest Voting Huaneng Taicang Power Generation Co., Ltd. PRC held directly RMB 804,146,700 Power generation 75% 75% Huaneng Huaiyin II Power Generation Limited Company PRC held directly RMB 930,870,000 Power generation 63.64% 63.64% Huaneng Xindian Power Generation Co., Ltd. PRC held directly RMB 465,600,000 Power generation 95% 95% Huaneng Shanghai Combined Cycle Power Limited Liability Company PRC held directly RMB 699,700,000 Power generation 70% 70% Huaneng Yumen Wind Power Generation Co., Ltd. PRC held directly RMB 719,170,000 Construction, operation and management of wind power generation and related projects 100% 100% Huaneng Qingdao Co-generation Limited Company PRC held directly RMB 214,879,000 Construction, operation and management of co-generation power plants and related projects 100% 100% Huaneng Tongxiang Combined Cycle Co-generation Co., Ltd. PRC held directly RMB 300,000,000 Production and sales of electricity and heat; investment in combined cycle co-generation industries 95% 95% Huaneng Eastern Yunnan Energy Mine Construction Co., Ltd. PRC held indirectly RMB 10,000,000 Mine engineering, construction engineering, equipment installation engineering 100% 100% Huaneng Nanjing Combined Cycle Co-generation Co., Ltd. PRC held directly RMB 582,000,000 Construction, operation and management of power plants and related projects 60% 60% Huaneng Shantou Haimen Power Generation Limited Liability Company PRC held directly RMB 1,508,000,000 Construction, operation and management of power plants and related projects 80% 80% Huaneng Chongqing Liangjiang Power Generation Limited Liability Company("Liangjiang Power") PRC held directly RMB 726,600,000 Construction, operation and management of natural gas power plants and related projects 90% 90% Chongqing Huaqing Energy Co., Ltd. ("Huaqing Energy") (ii) PRC held indirectly RMB 44,420,000 Providing thermal energy and cold energy services; supplying electricity 54% 60% Huaneng Yunnan Fuyuan Wind Power Generation Co., Ltd. PRC held directly RMB 157,290,000 Wind power project investment, management and sales 100% 100% Huaneng Guizhou Panxian Wind Power Generation Co., Ltd. PRC held directly RMB 86,500,000 Construction and management of wind power plants and related projects 100% 100% Huaneng Jiangxi Clean Energy Limited Liability Company PRC held directly RMB 5,000,000 Power generation and supply, development, management and construction of clean energy projects 100% 100% Name of subsidiary Country of incorporation Type of interest held Registered capital Business nature and scope of operations Percentage of equity interest held Interest Voting Huaneng Suzhou Combined Cycle Co-generation Co., Ltd. ("Suzhou Combined Cycle Co-generation") (ix) PRC held indirectly RMB 310,000,000 Construction and management of natural gas power plant and related projects 53.45% 100% Huaneng Hunan Subaoding Wind Power Generation Co., Ltd. PRC held directly RMB 266,000,000 Construction, operation and management of wind power plants and related projects 100% 100% Huaneng Suixian Jieshan Wind Power Generation Co., Ltd. PRC held directly RMB 96,500,000 Construction, operation and management of wind power plants and related projects 100% 100% Huaneng Taiyuan Dongshan Combined Cycle Co-generation Co., Ltd. PRC held directly RMB 600,000,000 Construction and operation of thermal heating network, development and utilization of clean energy resources 100% 100% Huaneng Xuzhou Tongshan Wind Power Generation Co., Ltd. PRC held directly RMB 2,644,560,000 Wind power generation, electricity engineering design services, maintenance of power supply and control facilities, solar energy power generation 70% 70% Huaneng Nanjing Co-generation Co., Ltd. PRC held directly RMB 300,000,000 Construction and operation of power plants, thermal heating services 70% 70% Huaneng Hunan Guidong Wind Power Generation Co., Ltd. PRC held directly RMB 140,000,000 Investment, construction, operation and management of electricity projects; development and utilization of clean energy resources 100% 100% Huaneng Nanjing Luhe Wind Power Generation Co., Ltd. PRC held directly RMB 63,800,000 Investment, construction, operation, management of electricity projects; development and utilization clean energy resources 100% 100% Huaneng Luoyuan Power Generation Limited Liability Company PRC held directly RMB 1,000,000,000 Construction, operation and management of power plants and related projects 100% 100% Huaneng Lingang (Tianjin) Gas Co-generation Co., Ltd. PRC held directly RMB 180,000,000 Providing generation and supply 100% 100% Huaneng Lingang (Tianjin) Heat Co-generation Co., Ltd. PRC held indirectly RMB 5,000,000 Providing thermal energy and cold energy services, supplying steam and hot water (except portable water), plumbing pipe installation and repair, energy engineering construction 66% 66% Huaneng Anhui Huaining Wind Power Generation Co., Ltd. PRC held directly RMB 122,000,000 Investment, construction and operation of electricity projects, development and utilization of clean energy resources 100% 100% Name of subsidiary Country of incorporation Type of interest held Registered capital Business nature and scope of operations Percentage of equity interest held Interest Voting Huaneng Mianchi Co-generation Limited Liability Company PRC held directly RMB 570,000,000 Construction, operation and management of coal-fired plants and related projects 60% 60% Huaneng Yingkou Xianrendao Co-generation Co., Ltd. PRC held directly RMB 277,690,000 Power generation and supply, development and utilization of clean energy resources 100% 100% Huaneng Nanjing Xingang Comprehensive Energy Co., Ltd. PRC held directly RMB 10,000,000 Thermal generation and supply, power distribution and sales 65% 65% Huaneng Changxing Photovoltaic Power Generation Limited Liability Company PRC held directly RMB 16,000,000 Construction and operation of distributed photovoltaic power generation plants and related projects 100% 100% Huaneng Rudong Baxianjiao Offshore Wind Power Generation Co., Ltd. PRC held directly RMB 610,000,000 Infrastructure construction of wind power plants 70% 70% Huaneng Guilin Gas Distributed Energy Co., Ltd. PRC held directly RMB 267,450,000 Construction, operation and management of power plants thermal management and related projects 80% 80% Huaneng (Dalian) Co-generation Co., Ltd. PRC held directly RMB 12,500,000 Construction, operation and management of co-generation power plants and related projects 100% 100% Huaneng Zhongxiang Wind Power Generation Co., Ltd. PRC held directly RMB 10,000,000 Construction, operation and management of wind power plants and related projects 100% 100% Huaneng Guanyun Co-generation Co., Ltd. PRC held directly RMB 15,000,000 Construction, operation and management of co-generation power plants, heating network and expansion engineering 100% 100% Huaneng International Power Hongkong Limited Company HongKong held directly 100,000 Shares Development, construction management and operation of power supply, coal projects; related investment and financing businesses 100% 100% Tuas Power Generation Pte. Ltd. ("TPG") Singapore held indirectly S$ 1,183,000,001 Power generation and related by-products, derivatives, developing power supply resources, operating electricity and power sales 100% 100% TP Utilities Pte. Ltd. Singapore held indirectly S$ 255,500,001 Provision of energy, power supply, thermal supply, management of industrial water and waste 100% 100% Name of subsidiary Country of incorporation Type of interest held Registered capital Business nature and scope of operations Percentage of equity interest held Interest Voting TP-STM Water Resources Pte. Ltd. Singapore held indirectly S$ 4,500,000 Providing desalinated water 60% 60% Huaneng Shanxi Taihang Power Generation Limited Liability Company PRC held directly RMB 1,086,440,000 Pre-services related to coal-fired generation 60% 60% Huaneng Mianchi Clean Energy Limited Liability Company PRC held directly RMB 10,000,000 Wind Power generation, new energy development and utilization 100% 100% Huaneng Zhuolu Clean Energy Limited Liability Company PRC held directly RMB 78,878,100 Construction, operation and management of power plants and related projects 100% 100% Huaneng Tongwei Wind Power Generation Limited Liability Company PRC held directly RMB 248,000,000 Construction, operation and management of wind power plants and related projects 100% 100% Huaneng Yizheng Wind Power Generation Limited Liability Company PRC held directly RMB 200,000,000 Wind power plants design, construction, management and maintenance 100% 100% Huaneng Yancheng Dafeng New Energy Power Generation Limited Liability Company PRC held directly RMB 5,000,000 Construction, operation and management of wind power, photovoltaic power plant 100% 100% Huaneng Shanyin Power Generation Limited Liability Company PRC held directly RMB 1,573,000,000 Construction, operation and management of power plants and related projects 51% 51% Huaneng Jiangsu Energy Sales Limited Liability Company PRC held directly RMB 200,000,000 Purchase and sales of electricity and thermal energy, water supply services, construction and operation of electricity distribution network and heating pipe network 100% 100% Huaneng Liaoning Energy Sales Limited Liability Company PRC held directly RMB 200,000,000 Sales of electricity, thermal energy and circulating hot water 100% 100% Huaneng Guangdong Energy Sales Limited Liability Company PRC held directly RMB 200,000,000 Power and thermal energy supply, energy conservation technology service, transmission and substation projects contracting 100% 100% Huaneng Suizhou Power Generation Limited Liability Company PRC held directly RMB 50,000,000 Construction, operation and management of power plants, production and sales of electricity and heating 100% 100% Huaneng Changle Photovoltaic Power Generation Limited Liability Company PRC held directly RMB 10,000,000 Construction, operation and management of photovoltaic power plants and related projects 100% 100% Huaneng Longyan Wind Power Generation Limited Liability Company PRC held directly RMB 10,000,000 Construction, operation and management of wind power plants and related projects 100% 100% Name of subsidiary Country of incorporation Type of interest held Registered capital Business nature and scope of operations Percentage of equity interest held Interest Voting Huaneng Yunnan Malong Wind Power Generation Limited Liability Company PRC held directly RMB 10,000,000 Construction, operation and management of wind power plants and related projects 100% 100% Huaneng Dandong Photovoltaic Power Generation Limited Liability Company PRC held directly RMB 17,720,000 Investment, construction operation and management of electricity projects, development and utilization of clean energy resources 100% 100% Huaneng Dongguan Combined Cycle Co-generation Limited Liability Company PRC held directly RMB 50,000,000 Investment of electricity projects, thermal power generation and supply, investment in heating pipe network, development and utilization of clean energy resources 100% 100% Huaneng Yangxi Photovoltaic Power Generation Limited Liability Company PRC held directly RMB 62,500,000 Photovoltaic electric power production and sales 80% 80% Huaneng Chongqing Fengjie Wind Power Generation Limited Liability Company PRC held directly RMB 10,000,000 Electricity production and supply; development and utilization of clean energy resources 100% 100% Huaneng Changxing Hongqiao Photovoltaic Power Generation Limited Liability Company PRC held directly RMB 10,000,000 Electricity production and supply; development and utilization of clean energy resources 100% 100% Huaneng Jingxing Photovoltaic Power Generation Limited Liability Company PRC held directly RMB 100,000 Investment, construction and management of photovoltaic power plants 100% 100% Huaneng Shanxi Energy Sales Limited Liability Company PRC held directly RMB 210,000,000 Electricity supply and sales, investment, construction, operation and repair of regional transmission and distribution network 100% 100% Huaneng Chongqing Energy Sales Limited Liability Company PRC held directly RMB 210,000,000 Operation of natural gas, electric energy and thermal energy products sales 100% 100% Huaneng Chongqing Luohuang Energy Sales Limited Liability Company PRC held indirectly RMB 210,000,000 Sales and supply of electricity, sales of thermal products 90% 90% Huaneng Chongqing Tongliang Energy Sales Limited Liability Company PRC held indirectly RMB 210,000,000 Operation of natural gas, sales of electricity supply, sales of thermal products 51% 51% Huaneng Hunan Energy Sales Limited Liability Company PRC held directly RMB 210,000,000 Electricity and thermal energy products sales 100% 100% Huaneng Jiangxi Energy Sales Limited Liability Company PRC held directly RMB 210,000,000 Construction, operation and management of heating and power supply facilities 100% 100% Name of subsidiary Country of incorporation Type of interest held Registered capital Business nature and scope of operations Percentage of equity interest held Interest Voting Huaneng Hebei Energy Sales Limited Liability Company PRC held directly RMB 210,000,000 Construction, installation, maintenance and repair of heating and power supply facilities 100% 100% Huaneng Henan Energy Sales Limited Liability Company PRC held directly RMB 210,000,000 Sales of electricity, heating, gas and other energy products 100% 100% Huaneng Handan Heating Limited Liability Company PRC held directly RMB 100,000,000 Construction, operation and maintenance of heating sources and pipe network 100% 100% Huaneng (Huzhou Development Zone) Photovoltaic Power Generation Limited Liability Company PRC held directly RMB 10,000,000 Photovoltaic power generation; power supply, purchase and sales 100% 100% Huaneng Fujian Energy Sales Limited Liability Company PRC held directly RMB 210,000,000 Sales of electricity, heating, gas and other energy products 100% 100% Huaneng Hubei Energy Sales Limited Liability Company PRC held directly RMB 210,000,000 Sales of electricity, heating, gas and other energy products 100% 100% Huaneng (Sanming) PRC held directly RMB Construction, operation 100% 100% Huaneng Yueyang Xingang Photovoltaic Power Generation Limited Liability Company PRC held directly RMB 16,000,000 Construction, operation and management of electricity projects, development and utilization of clean energy 60% 60% Huaneng Shanghai Energy Sales Limited Liability Company PRC held directly RMB 210,000,000 Power supply (except construction and operation of electricity network), technology services in energy conservation and environmental protection 100% 100% Huaneng Yushe Photovoltaic Power Generation Limited Liability Company PRC held directly RMB 10,000,000 Production and supply of electric power 100% 100% Huaneng Anhui Energy Sales Limited Liability Company PRC held directly RMB 210,000,000 Sales of electricity, heating gas and other energy products 100% 100% Huaneng (Shanghai) Power Maintenance Limited Liability Company PRC held directly RMB 200,000,000 Contracting installation and repair of electricity facilities 100% 100% Huaneng Guanyun Clean Energy Power Limited Liability Company PRC held directly RMB 26,000,000 Sales of electricity 100% 100% Name of subsidiary Country of incorporation Type of interest held Registered capital Business nature and scope of operations Percentage of equity interest held Interest Voting Huaneng Jianchang Photovoltaic Power Generation Limited Liability Company* PRC held directly RMB 10,000,000 Production and supply of electricity, development and utilization of clean energy resources 100% 100% Huaneng Chaoyang Photovoltaic Power Generation Limited Liability Company* PRC held directly RMB 10,000,000 Production and supply of electricity, development and utilization of clean energy resources 100% 100% Huaneng (Luoyuan) Port Limited Company (x) PRC held directly RMB 169,710,000 Port management, investment and development 100% 100% Huaneng Shijiazhuang Energy Limited Liability Company PRC held directly RMB 60,000,000 Production and supply of heating, purchase and sales of electricity 66.60% 66.60% Huaneng Jiangyin Combined Cycle Co-generation Limited Liability Company* PRC held directly RMB 600,000,000 Production and supply of electricity, production and supply of heating 51% 51% Huaneng Anyang Energy Limited Liability Company PRC held directly RMB 10,000,000 Production and supply of electricity, production and supply of heating 100% 100% Huaneng Shanxi Comprehensive Energy Limited Liability Company PRC held directly RMB 120,000,000 Production and supply of electricity, production and supply of heating 100% 100% Huaneng Zhanhua Photovoltaic Power Generation Limited Company ("Zhanhua Photovoltaic Company") (vi)* PRC held indirectly RMB 145,790,000 Photovoltaic power generation 46.40% 58% Huaneng Weishan New Energy Limited Company ("Weishan New Energy") (vi)* PRC held indirectly RMB 167,000,000 Investment, production and sales of new energy power generation projects 40% 100% Huaneng Ruyi (Helan) New Energy Limited Company ("Helan New Energy") (vi)* PRC held indirectly RMB 19,000,000 Photovoltaic power generation 40% 100% Huaneng Dezhou New Energy Limited Company (vi)* PRC held indirectly RMB 2,500,000 Photovoltaic power generation, wind power generation, biomass power generation 80% 100% Zhaodong Huaneng Dechang Solar Power Generation Limited Company* PRC held indirectly RMB 30,810,000 Solar energy generation and technology promotion, repair electricity facilities 100% 100% Daqing Huaneng Shuangyu Solar Power Generation Limited Company* PRC held indirectly RMB 20,000,000 Solar energy generation 100% 100% Huaneng Taizhouwan Juji District Photovoltaic Power Generation Limited Liability Company* PRC held directly RMB 100,000 Production and supply of electricity projects 100% 100% Name of subsidiary Country of incorporation Type of interest held Registered capital Business nature and scope of operations Percentage of equity interest held Interest Voting Huaneng Mingguang Wind Power Generation Limited Liability Company* PRC held directly RMB 10,000,000 Production and supply of electricity; investment,construction, operation and management of electricity projects 100% 100% Huaneng Guangxi Energy Sales Limited Liability Company* PRC held directly RMB 210,000,000 Power supply, contracting installation and repair of electricity facilities 100% 100% Huaneng Ruzhou Clean Energy Limited Liability Company* PRC held directly RMB 80,000,000 Production and supply of electricity projects, investment, construction and operation of electricity projects 95% 95% Huaneng Hunan Lianping Wind Power Generation Limited Liability Company* PRC held directly RMB 173,920,000 Production and supply of electricity 80% 80% Huaneng Abagaqi Clean Energy Limited Liability Company* PRC held directly RMB 100,000 Production, supply and sales of electricity and thermal energy 100% 100% Huaneng Jiashan Photovoltaic Power Generation Limited Liability Company* PRC held directly RMB 10,000,000 Production and supply of electricity 100% 100% Huaneng Zhejiang Energy Sales Limited Liability Company* PRC held directly RMB 210,000,000 New energy technology development, technology consulting, transferring of results 100% 100% Huaneng Guangdong Shantou Power Generation Limited Liability Company* PRC held directly RMB 10,000,000 Production and supply of electricity and thermal energy 100% 100% Huaneng Shantou Photovoltaic Power Generation Limited Liability Company* PRC held directly RMB 100,000 Production and supply of electricity 100% 100% Huaneng Guigang Clean Energy Limited Liability Company* PRC held directly RMB 10,000,000 Production and supply of electricity, investment, construction and operation of electricity projects 100% 100% Huaneng Changxing Jiapu Photovoltaic Power Generation Limited Liability Company* PRC held directly RMB 10,000,000 Production and supply of electricity, investment in electricity projects 100% 100% Huaneng Hainan Energy Sales Limited Liability Company* PRC held indirectly RMB 210,000,000 Construction and operation of heat and power supply facilities, operation of heat resources, heat network and power supply facilities 91.80% 91.80% Huaneng Yangpu Co-generation Limited Company* PRC held indirectly RMB 802,222,000 Investment, construction operation and management of electricity projects and heat pipe network 82.62% 82.62% * These companies were newly established in 2017. (ii) Subsidiaries acquired from business combinations under common control Name of subsidiary Country of incorporation Type of interest held Registered capital Business nature and scope of operations Percentage of equity interest held Interest Voting Huaneng (Suzhou Industrial Park) Power Generation Co., Ltd PRC held directly RMB 632,840,000 Power generation 75% 75% Huaneng Qinbei Power Generation Co., Ltd. ("Qinbei Power") PRC held directly RMB 1,540,000,000 Power generation 60% 60% Huaneng Yushe Power Generation Co., Ltd. PRC held directly RMB 615,760,000 Power generation, power distribution, sales of power 60% 60% Huaneng Hunan Yueyang Power Generation Limited Liability Company PRC held directly RMB 1,935,000,000 Power generation 55% 55% Huaneng Chongqing Luohuang Power Generation Limited Liability Company ("Luohuang Power") PRC held directly RMB 1,748,310,000 Power generation 60% 60% Huaneng Pingliang Power Generation Co., Ltd. PRC held directly RMB 924,050,000 Power generation 65% 65% Huaneng Nanjing Jinling Power Generation Co., Ltd. PRC held directly RMB 1,513,136,000 Power generation 60% 60% Huaneng Qidong Wind Power Generation Co., Ltd. PRC held directly RMB 391,738,500 Development of wind power projects, production and sales of electricity 65% 65% Tianjin Huaneng Yangliuqing Co-generation Limited Liability Company ("Yangliuqing Co-generation") PRC held directly RMB 1,537,130,909 Power generation, heat supply, facilities installation, maintenance and related services 55% 55% Huaneng Beijing Co-generation Limited Liability Company ("Beijing Co-generation") (iii) PRC held directly RMB 3,702,090,000 Construction and operation of power plants and related construction projects 41% 66% Huaneng Wuhan Power Generation Co., Ltd. ("Wuhan Power") PRC held directly RMB 1,478,461,500 Investment, construction, operation and management of electricity projects, development and utilization of clean energy resources 75% 75% Huaneng Anyuan Power Generation Co., Ltd. ("Anyuan Power") PRC held directly RMB 1,175,117,300 Construction and operation of power plants and related construction projects, Production of electricity 100% 100% Huaneng Hualiangting Hydropower Co., Ltd. ("Hualiangting Hydropower") PRC held directly RMB 50,000,000 Generation and transfer of power supply, water supply (irrigation) 100% 100% Huaneng Chaohu Power Generation Co., Ltd. ("Chaohu Power") (iv) PRC held directly RMB 840,000,000 Construction, operation, management of electricity projects,development and utilization of clean energy resources 60% 70% Huaneng Jingmen Thermal Power Co., Ltd. ("Jingmen Thermal Power") PRC held directly RMB 780,000,000 Thermal power, power development and other service 100% 100% Name of subsidiary Country of incorporation Type of interest held Registered capital Business nature and scope of operations Percentage of equity interest held Interest Voting Enshi Qingjiang Dalongtan Hydropower Development Co., Ltd. ("Dalongtan Hydropower") PRC held directly RMB 76,000,000 Hydropower development, production and management of electric power, urban water supply 97% 97% Huaneng Suzhou Thermal Power Co., Ltd. ("Suzhou Thermal Power") PRC held directly RMB 600,000,000 Construction, operation and management of electricity projects, development and utilization of clean energy 53.45% 100% Huaneng Hainan Power Generation Limited Company ("Hainan Power") PRC held directly RMB 1,326,419,587 Investment, construction operation of various power plants, regular energy and new energy development 91.80% 91.80% Huaneng Ruijin Power Generation Co., Ltd. ("Ruijin Power Generation") PRC held directly RMB 536,923,299 Construction, operation, management of electricity projects, development and utilization of clean energy 100% 100% Huaneng Yingcheng Thermal Power Co., Ltd. ("Yingcheng Thermal Power") PRC held directly RMB 650,000,000 Construction and operation of power plants and production, sales of power and heat 100% 100% Huaneng Heilongjiang Power Generation Limited Company ("Heilongjiang Power") PRC held directly RMB 783,350,000 Development, investment, construction, production and management of power (thermal) projects 100% 100% Huaneng Hegang Power Generation Limited Company ("Hegang Power") PRC held indirectly RMB 1,092,550,000 The electricity power construction, energy conservation and development projects, heat production and supply 64% 64% Huaneng Xinhua Power Generation Limited Liability Company ("Xinhua Power") PRC held indirectly RMB 284,880,000 Power generation, power equipment repair 70% 70% Huaneng Tongjiang Wind Power Generation Limited Company ("Tongjiang Wind Power") PRC held indirectly RMB 330,000,000 Wind power generation, wind power plants operation, planning and design 82.85% 82.85% Huaneng Daqing Thermal Power Limited Company ("Daqing Thermal Power") PRC held indirectly RMB 630,000,000 Power generation, thermal production and supply 100% 100% Daqing Luyuan Wind Power Generation Limited Company ("Luyuan Wind Power") PRC held indirectly RMB 451,000,000 Wind power generation 100% 100% Huaneng Yichun Thermal Power Limited Company ("Yichun Thermal Power") PRC held indirectly RMB 534,000,000 Power construction, production and sales, thermal production and sales production of heat and hot water 100% 100% Huaneng Heilongjiang Energy Sales Limited Company ("Heilongjiang Energy Sales") PRC held indirectly RMB 210,000,000 Power supply, 100% 100% Percentage of equity interest held Name of subsidiary Country of incorporation Type of Interest held Registered capital Business nature and scope of operations Interest Voting Zhaodong Huaneng Thermal Power Limited Company ("Zhaodong Thermal Power") PRC held indirectly RMB 10,000,000 Heating production and supply 100% 100% Huaneng Jilin Power Generation Limited Company ("Jilin Power") PRC held directly RMB 1,917,130,000 Power (thermal) projects, development of new energy projects investment, construction, production, operation and sales 100% 100% Huaneng Linjiang Jubao Hydropower Limited Company ("Jubao Hydropower") PRC held indirectly RMB 20,000,000 Hydropower development and operation, construction and operation of photovoltaic power generation 100% 100% Huaneng Jilin Energy Sales Limited Company ("Jilin Energy Sales - PRC held indirectly RMB 210,000,000 Thermal (cold) production and supply, power supply 100% 100% Huaneng Jilin Biological Power Generation Limited Company ("Jilin Biological Power') PRC held indirectly RMB 183,800,000 Biomass power generation 100% 100% Huaneng Shandong Power Generation Limited Company ("Shandong Power") PRC held directly RMB 4,241,460,000 Power (thermal) project development, investment. construction and management 80% 80% Huaneng Jining New Energy Limited Company ("Jining New Energy") (vi) PRC held indirectly RMB 38,000,000 investment, construction and management of photovoltaic and wind power projects 80% 100% Huaneng Zibo Boshan Photovoltaic Power Limited Company ("Zibo Photovoltaic") (vi) PRC held indirectly RMB 22,000.000 Solar power generation, sales 80% 100% Huaneng Rizhao Thermal Power Limited Company ("Rizhao Thermal Power") (vi) PRC held indirectly RMB 52,000,000 Urban heat construction, maintenance and operation design and construction of heat engineering 80% 100% Huaneng Laiwu New Energy Limited Company ("Laiwu New Energy") (vi) PRC held indirectly RMB 68,000,000 Photovoltaic power and wind power generation 80% 100% Huaneng Shandong Sishui New Energy Limited Company ("Sishui New Energy") (vi) PRC held indirectly RMB 36,000,000 Solar energy grid connected generation 80% 100% Huaneng Shandong Electric And Thermal Power Marketing Limited Company ("Shandong Power Marketing") (vi) PRC held indirectly RMB 200,000,000 Sales and service of power and heating products, investment in power industry 80% 100% Huaneng Shandong Information Technology Limited Company ("Shandong Power Information Company") (vi) PRC held indirectly RMB 80,000,000 Information technology and management consulting services 80% 100% Huaneng Penglai Wind Power Generation Limited Company ("Penglai Wind Power") (vi) PRC held indirectly RMB 177,210,000 Development, investment, construction and management of wind power projects 80% 100% Percentage of equity interest held Name of subsidiary Country of incorporation Type of Interest held Registered capital Business nature and scope of operations Interest Voting Huaneng Zhanhua New Energy Limited Company ("Zhanhua New Energy") (vi) PRC held indirectly RMB 235,298,200 Wind power, photovoltaic power generation 80% 100% Huaneng Venial Bajiao Thermal Power Limited Company ("Hajino Thermal Power") (vi) PRC held indirectly RMB 540,000,000 Power generation projects preparation 80% 100% Huaneng Weihai Port Photovoltaic Power Generation Limited Company ("Port Photovoltaic") (vi) PRC held indirectly RMB 24,960,000 Photovoltaic power generation projects development and construction, electricity sales 80% 100% Huaneng Zibo Baiyanghe Power Generation Limited Company ("Baiyanghe Power") (vi) PRC held indirectly RMB 1,098,567,344 Power production, ongrid sales, thermal production and supply 80% 100% Huaneng Yantai Power Generation Limited Company ("Venial Power") (vi) PRC held indirectly RMB 547,479,100 Production and sal

Available-for-sale financial as

Available-for-sale financial assets	12 Months Ended
	Dec. 31, 2017
Available-for-sale financial assets [abstract]
Available-for-sale financial assets	10 Available-for-sale financial assets Available-for-sale financial assets include the following: As at 31 December 2017 2016 Listed security (Fair value measurement) China Yangtze Power Co., Ltd. - 1,820,255 Others 9,223 458 Subtotal 9,223 1,820,713 Unlisted securities (Cost measurement) 10% of Shanxi Xishan Jinxing Energy Co., Ltd. 531,274 531,274 9.09% of Ganlong Double-track Railway Co., Ltd. 1,000,000 1,000,000 Others 64,496 54,045 Subtotal 1,595,770 1,585,319 Total 1,604,993 3,406,032 There were no impairment provisions provided on available-for-sale financial assets in 2017 and 2016. In 2017, all of the 143.78 million shares of China Yangtze Power Co., Ltd. held by the Company were disposed with cash consideration of RMB2.191 billion received. After deducting initial investment costs and related taxes, investment income was recognized amounting to approximately RMB1,480 million, with other comprehensive income of RMB1,135 million reclassified to profit or loss.

Land use rights

Land use rights	12 Months Ended
	Dec. 31, 2017
Land use rights [abstract]
Land use rights	11 Land use rights The movements in the carrying amount of land use rights during the years are as follows: 2017 2016 Beginning of the year Cost 10,525,537 10,059,872 Accumulated amortization (1,792,367 ) (1,530,972 ) Accumulated impairment losses (276,823 ) (215,134 ) Net book value 8,456,347 8,313,766 Movement: Business combination (Note 40) 3,182,914 61,027 Addition 331,683 364,280 Amortization charge for the year (368,898 ) (242,400 ) Impairment charge for the year (Note 7) (108,590 ) (51,981 ) Disposals (86,631 ) (1,969 ) Disposal of subsidiaries (146,922 ) - Currency translation differences 4,882 13,624 End of the year 11,264,785 8,456,347 Cost 13,775,976 10,525,537 Accumulated amortization (2,128,752 ) (1,792,367 ) Accumulated impairment losses (382,439 ) (276,823 ) Net book value 11,264,785 8,456,347 All the lands located in the PRC and Singapore are leased from respective governments according to corresponding regulations applied across the countries. The Company and its subsidiaries will renew the leases according to the operation requirements of the Company and its subsidiaries and the related regulations of respective countries. Land use rights without ownership certificate As at 31 December 2017, the Company and its subsidiaries were in the process of applying for the ownership certificate for certain land use right with an aggregate net book value of RMB1,246 million (2016: RMB792 million). The management are of the opinion that the Company and its subsidiaries are entitled to the lawful and valid occupation and use of the above mentioned land.

Power generation licenses

Power generation licenses	12 Months Ended
	Dec. 31, 2017
Power generation licenses [abstract]
Power generation licenses	12 Power generation licenses The movements in the carrying amount of power generation license during the years are as follows: 2017 2016 Beginning of the year 3,849,199 3,679,175 Movement: Currency translation differences 67,047 170,024 End of the year 3,916,246 3,849,199 The Company and its subsidiaries acquired the power generation license in connection with the acquisition of Tuas Power. The power generation license was initially recognized at fair value at the acquisition date. Tuas Power operates power plants in Singapore pursuant to the license granted by the Energy Market Authority for a period of 30 years from 2003 until 2032. The license was extended to 2044 during 2011 with minimal costs and is subject to further renewal. The Company and its subsidiaries expect that the applicable rules and regulations surrounding the renewal can be complied with based on the current market framework. The Company and its subsidiaries assessed the useful life of the power generation license at 31 December 2017 as indefinite and therefore the license is not amortized. Impairment test of power generation license Power generation license belongs to and has been assigned to Tuas Power, a CGU. The recoverable amount of the CGU is determined based on value-in-use calculation. Management prepared the impairment model based on budget approved by the Board and various factors, such as inflation, power demand and other factors as well as the terminal value. Key assumptions used for value-in-use calculation: Management has assessed that one of the most sensitive key assumptions is the discount rate which was arrived at based on weighted average cost of capital. The discount rate applied in determining the recoverable amounts of the CGU was 7.30% (31 December 2016: 7.54%). An absolute increase in the discount rate of 0.5% (31 December 2016: 0.5%) would result in approximately RMB2,043 million (31 December 2016: RMB1,899 million) decrease in the recoverable amount of the CGU. Other key assumptions include projection of its business performance based on estimation of gross margin from electricity sold, volume of electricity sold and other operating expenses, which are largely based on a combination of past performance of the CGU, its expectation of market developments and consistency with forecasts included in industry reports. On average, the growth rates of 3.0% was used in consideration of future expansion plans and new development projects as part of the long-term strategy. Cash flows beyond the terminal year was extrapolated using a growth rate of 2%. Based on the assessments, no impairment was provided for the power generation license.

Mining rights

Mining rights	12 Months Ended
	Dec. 31, 2017
Mining rights [abstract]
Mining rights	13 Mining rights The movements in the carrying amount of mining rights during the years are as follow: 2017 2016 Beginning of the year Cost 2,406,567 2,406,567 Accumulated impairment losses (760,296 ) (760,296 ) Net book value 1,646,271 1,646,271 Movement: Addition - - Impairment charge for the year - - End of the year 1,646,271 1,646,271 Cost 2,406,567 2,406,567 Accumulated impairment losses (760,296 ) (760,296 ) Net book value 1,646,271 1,646,271

Derivative financial instrument

Derivative financial instruments	12 Months Ended
	Dec. 31, 2017
Derivative financial instruments [abstract]
Derivative financial instruments	14 Derivative financial instruments Details of derivative financial instruments are as follows: As at 31 December 2017 2016 Derivative financial assets －Hedging instruments for cash flow hedge (fuel swap contracts) 330,966 264,535 －Hedging instruments for cash flow hedge (exchange forward contracts) - 107,907 －Financial instruments at fair value through profit or loss (fuel swap contracts) 2,726 5,881 Total 333,692 378,323 Less: non-current portion －Hedging instruments for cash flow hedge (fuel swap contracts) 75,328 71,341 －Hedging instruments for cash flow hedge (exchange forward contracts) - 28,380 Total non-current portion 75,328 99,721 Current portion 258,364 278,602 Derivative financial liabilities －Hedging instruments for cash flow hedge (fuel swap contracts) 11,794 164,464 －Hedging instruments for cash flow hedge (exchange forward contracts) 68,102 454 －Hedging instruments for cash flow hedge (interest rate swap contracts) 130,643 169,201 －Financial instruments at fair value through profit or loss (fuel swap contracts) 125 619 Total 210,664 334,738 Less: non-current portion －Hedging instruments for cash flow hedge (fuel swap contracts) 2,026 31,673 －Hedging instruments for cash flow hedge (exchange forward contracts) 21,745 295 －Hedging instruments for cash flow hedge (interest rate swap contracts) 124,715 169,201 Total non-current portion 148,486 201,169 Current portion 62,178 133,569 For the years ended 31 December 2016 and 2017, no material ineffective portion was recognized in the profit or loss arising from cash flow hedges. The Company uses an interest rate swap contract to hedge its interest rate risk against one of its variable rate loans. The notional principal amount of the outstanding interest rate swap contract at 31 December 2017 was US$176million (RMB equivalents of RMB1,150 million) (2016: US$208 million (RMB equivalents of RMB1,443 million)). Through this arrangement, the Company pays an annual fixed interest of 4.40% while the original annual floating interest expense (6-month LIBOR+1%) attached in the loan is offset by the receivable leg of the interest rate swap. Such a swap is settled on a quarterly basis from September 2009 to September 2019. TPG uses exchange forward contracts to hedge its foreign exchange risk arising from highly probable forecast purchase transactions. It also uses fuel oil swap contracts to hedge its fuel price risk arising from highly probable forecast purchases of fuel purchases. TPG also uses various interest rate swap contracts to hedge floating semi-annual interest payments on borrowings with maturity dates up to 2020. The notional principal amount of these outstanding interest rate swap contracts at 31 December 2017 was S$1,069million (RMB equivalents of RMB5,220 million) (2016: S$1,359million (RMB equivalents of RMB6,522 million)). Through these arrangements, TPG swaps original floating interest (6-month SOR) to annual fixed interest determined by individual swap contracts. Such swap contracts are settled semi-annually from September 2011 to March 2020. As at 31 December 2017, these interest rate swap contracts are carried on the consolidated statements of financial position as financial liability of RMB108 million (2016: financial liability of RMB99 million). The analysis of contractual cash inflows/(outflows) of major derivative financial instruments are as follows: Cash flows Carrying amounts Contractual cash flows Within 1 year Between 1 and 5 years After 5 years As at 31 December 2017 Derivative financial assets Fuel derivatives used for hedging (net settlement) 330,966 330,966 255,638 75,328 - Fuel derivatives that do not qualify as hedges (net settlement) 2,726 2,726 2,726 - Derivative financial liabilities Fuel derivatives used for hedging (net settlement) 11,794 (11,794 ) (9,768 ) (2,026 ) - Forward exchange contracts used for hedging - inflows 2,509,363 2,041,812 467,551 - - outflows (2,568,034 ) (2,083,441 ) (484,593 ) - 68,102 (58,671 ) (41,629 ) (17,042 ) - Net-settled interest rate swaps used for hedging - net cash inflows/(outflows) 130,643 (154,367 ) (82,533 ) (71,834 ) - Fuel derivatives that do not qualify as hedges (net settlement) 125 (125 ) (125 ) - As at 31 December 2016 derivative financial assets Fuel derivatives used for hedging (net settlement) 264,535 264,535 193,194 71,341 - Forward exchange contracts used for hedging - inflows 2,118,946 1,488,071 630,875 -- - outflows (2,009,205 ) (1,407,606 ) (601,599 ) - 107,907 109,741 80,465 29,276 - Fuel derivatives that do not qualify as hedges (net settlement) 5,881 5,881 5,881 - - Derivative financial liabilities Fuel derivatives used for hedging (net settlement) 164,464 (164,464 ) (132,792 ) (31,672 ) - Forward exchange contracts used for hedging - inflows 527,939 475,881 52,058 - - outflows (528,454 ) (476,104 ) (52,350 ) - 454 (515 ) (223 ) (292 ) - Net ― - net cash inflows/(outflows) 169,201 (228,905 ) (113,563 ) (115,342 ) - Fuel derivatives that do not qualify as hedges (net settlement) 619 (619 ) (619 ) - -

Goodwill

Goodwill	12 Months Ended
	Dec. 31, 2017
Goodwill [abstract]
Goodwill	15 Goodwill The movements of goodwill during the years are as follows: 2017 2016 Beginning of the year Cost 15,391,642 14,919,930 Accumulated impairment losses (3,255,913 ) (3,242,748 ) Net book value 12,135,729 11,677,182 Movement: Business combination (Note 40) 3,167,566 - Disposal of subsidiary-cost (309,269 ) - Disposal of subsidiary-impairment 309,269 - Currency translation differences-cost 186,015 471,712 Currency translation differences-impairment (5,190 ) (13,165 ) End of the year 15,484,120 12,135,729 Cost 18,435,954 15,391,642 Accumulated impairment losses (2,951,834 ) (3,255,913 ) Net book value 15,484,120 12,135,729 Impairment tests for goodwill Goodwill is allocated to the CGUs of the Company and its subsidiaries. The carrying amounts of major goodwill allocated to individual CGUs are as follows: 2017 2016 PRC Power segment: Shandong Power 2,739,818 - Wuhan Power 518,484 518,484 Hainan Power 506,336 506,336 Heilongjiang Power 265,319 - Yangliuqing Cogeneration 151,459 151,459 Qinbei Power 109,913 109,913 Jilin Power 109,826 - Yueyang Power Company 100,907 100,907 Beijing Cogeneration 95,088 95,088 Singapore segment: Tuas Power 10,561,956 10,381,131 The recoverable amount of a CGU is determined based on value-in-use calculations. For domestic CGUs, these calculations use cash flow projections based on management's financial budgets covering periods of no more than five years. The Company expects cash flows beyond such periods will be similar to that of the respective final forecast years on existing production capacity. For the goodwill allocated to Tuas Power, management has based their assessment of recoverable amount on value-in-use calculations. Management prepared the impairment model based on budget approved and various factors, such as inflation, power demand and other factors as well as the terminal value. On average, the growth rates of 3.0% was used in consideration of future expansion plans and new development projects as part of the long-term strategy. Cash flows beyond the terminal year was extrapolated using a growth rate of 2.0%. Discount rates used for value-in-use calculations: PRC Power segment 8.51%-13.59 % Singapore segment 7.30 % Key assumptions used for value-in-use calculations: Key assumptions applied in the impairment tests include the expected tariff rates, demands of electricity in specific regions where these power plants are located and fuel cost. Management determined these key assumptions based on past performance and its expectations on market development. The discount rates used reflect specific risks relating to individual CGUs. Management believes that any reasonably possible change in any of these key assumptions on which recoverable amounts of individual CGUs are based may cause carrying amounts of individual CGUs to exceed their recoverable amounts. Please refer to Note 4 and 12 for details of respective sensitivity analysis on domestic and oversea CGU impairment testing. In 2017 and 2016, the increase of goodwill in respect of Tuas Power was due to currency translation differences.

Other non-current assets

Other non-current assets	12 Months Ended
	Dec. 31, 2017
Other non-current assets [abstract]
Other non-current assets	16 Other non-current assets Details of other non-current assets are as follows: As at 31 December 2017 2016 VAT recoverable 2,741,604 1,651,891 Prepayments for pre-construction cost 937,161 - Intangible assets * 697,884 411,308 Finance lease receivables 617,187 563,099 Prepaid territorial water use right ** 374,743 777,994 Prepayments for capacity quota 303,399 - Profit compensation from Huaneng Group (Note 40) 244,533 - Prepaid connection fees 120,486 108,365 Others 1,659,848 809,288 Total 7,696,845 4,321,945 * The intangible assets primarily consist of software, patented technologies and etc. In 2017, there is no impairment provided for the intangible assets (2016: RMB nil). ** The prepaid territorial water use right are amortized over the contractual period of 50 years.

Inventories

Inventories	12 Months Ended
	Dec. 31, 2017
Inventories [abstract]
Inventories	17 Inventories Inventories comprised: As at 31 December 2017 2016 Fuel (coal and oil) for power generation 5,684,824 5,391,068 Material and supplies 1,869,462 1,655,357 7,554,286 7,046,425 Less: provision for inventory obsolescence 168,875 167,282 Total 7,385,411 6,879,143 Movements of provision for inventory obsolescence during the years are analyzed as follows: 2017 2016 2015 Beginning of the year (167,282 ) (162,389 ) (163,458 ) Provision (1,520 ) (1,134 ) (2,867 ) Reversal 1,782 1,390 1,039 Disposal of subsidiaries 162 - - Currency translation differences (2,017 ) (5,149 ) 2,897 End of the year (168,875 ) (167,282 ) (162,389 )

Other receivables and assets

Other receivables and assets	12 Months Ended
	Dec. 31, 2017
Other receivables and assets [abstract]
Other receivables and assets	18 Other receivables and assets Other receivables and assets comprised the following: As at 31 December 2017 2016 Prepayments for inventories 387,335 252,389 Prepaid income tax 150,838 141,423 Prepayments for pre-construction cost - 885,051 Prepayments for capacity quota - 303,399 Others 181,913 121,810 Total prepayments 720,086 1,704,072 Less: provision for doubtful accounts 4,638 - Total prepayments, net 715,448 1,704,072 Dividends receivable 273,897 861,408 Receivables from sales of fuel 290,040 - Others 1,528,855 908,296 Subtotal other receivables 2,092,792 1,769,704 Less: provision for doubtful accounts 29,241 28,961 Total other receivables, net 2,063,551 1,740,743 Profit compensation from Huaneng Group (Note 40) 615,013 - VAT recoverable 2,607,505 2,008,955 Designated loan to a joint venture 80,000 80,000 Gross total 6,115,396 5,562,731 Net total 6,081,517 5,533,770 Please refer to Note 36 for details of other receivables and assets due from the related parties. The gross amounts of other receivables are denominated in the following currencies: As at 31 December 2017 2016 RMB 1,966,971 1,635,051 S$ (RMB equivalent) 76,529 95,816 US$ (RMB equivalent) 49,292 38,837 Total 2,092,792 1,769,704 Movements of provision for doubtful accounts during the years are analyzed as follows: 2017 2016 2015 Beginning of the year (28,961 ) (27,957 ) (29,644 ) Provision (5,890 ) (1,011 ) (9 ) Reversal/write-off 972 7 1,696 End of the year (33,879 ) (28,961 ) (27,957 ) As at 31 December 2017, there was no indication of impairment relating to other receivables which were not past due and no material provision was made (2016: nil). As at 31 December 2017, other receivables of RMB140 million (2016: RMB113 million) were past due but not impaired. These amounts mainly represent funds deposited in a government agency and are fully recoverable. The ageing analysis of these other receivables was as follows: As at 31 December 2017 2016 Within 1 year 61,189 42,103 Between 1 to 2 years 1,360 2,683 Between 2 to 3 years 1,130 847 Over 3 years 76,376 67,476 Total 140,055 113,109 As at 31 December 2017, other receivables of RMB41 million which were past due (2016: RMB36 million) were impaired and a provision of RMB29 million (2016: RMB29 million) has been provided against the receivables. The individually impaired receivables have been long outstanding without any repayment agreements in place or possibility of renegotiation. It was assessed that a substantial portion of the receivables is not expected to be recovered. The ageing of these other receivables was as follows: As at 31 December 2017 2016 Within 1 year 7,535 752 Between 1 to 2 years 10 912 Between 2 to 3 years 463 285 Over 3 years 33,402 34,263 Total 41,410 36,212

Accounts receivable

Accounts receivable	12 Months Ended
	Dec. 31, 2017
Accounts receivable [abstract]
Accounts receivable	19 Accounts receivable Accounts receivable comprised the following: As at 31 December 2017 2016 Accounts receivable 21,948,753 14,050,096 Notes receivable 3,610,928 2,432,264 25,559,681 16,482,360 Less: provision for doubtful accounts 112,086 88,889 Total 25,447,595 16,393,471 The gross amounts of account receivables are denominated in the following currencies: As at 31 December 2017 2016 RMB 24,633,465 15,586,989 S$ (RMB equivalent) 922,993 876,956 US$ (RMB equivalent) 3,223 18,415 Total 25,559,681 16,482,360 The Company and its subsidiaries usually grant about one month's credit period to local power grid customers from the end of the month in which the sales are made, except for SinoSing Power which provides credit period that ranges from 5 to 60 days from the dates of billings. Certain accounts receivables of Singapore subsidiaries are backed by bankers' guarantees and/or deposits from customers. It is not practicable to determine the fair value of the collaterals that correspond to these accounts receivable. As at 31 December 2017, no accounts receivable was secured to banks as collateral against loans (2016: nil). For the collateral of notes receivable, please refer to Note 27 for details. Movements of provision for doubtful accounts during the years are analyzed as follows: 2017 2016 2015 Beginning of the year (88,889 ) (2,054 ) (11,809 ) Provision (23,363 ) (88,818 ) (60 ) Reversal - 397 1,833 Write-off 167 1,682 - Transfer from a subsidiary to a joint venture - - 8,126 Currency translation differences (1 ) (96 ) (144 ) End of the year (112,086 ) (88,889 ) (2,054 ) As at 31 December 2017, the Company and its subsidiaries recognised provisions for accounts receivable assessed on an individual basis, which mainly consists of receivables due from local customers for sales of electricity or heat. The provisions were provided based on operating results of the local customers and collectability of the receivables. (a) Ageing analysis of accounts receivable was as follows: As at 31 December 2017 2016 Within 1 year 24,787,284 16,152,038 Between 1 to 2 years 576,564 279,694 Between 2 to 3 years 155,360 29,123 Over 3 years 40,473 21,505 Total 25,559,681 16,482,360 As at 31 December 2017, the maturity period of the notes receivable ranged from 1 to 12 months (2016: from 1 to 12 months). (b) Ageing analysis of accounts receivable and notes receivable that are neither individually nor collectively considered to be impaired are as follows: As at 31 December 2017 2016 Neither past due nor impaired 24,936,171 16,063,215 Less than 1 year past due 267,845 248,597 Between 1 to 2 years past due 206,188 63,094 Between 2 to 3 years past due 27,130 17,944 Over 3 years past due 10,261 621 Total 25,447,595 16,393,471 Receivables that were past due but not impaired relate to a number of independent customers that have a good track record with the Company and its subsidiaries. Based on past experience, management believes that no impairment allowance is necessary in respect of these balances as there has not been a significant change in credit quality and the balances are still considered fully recoverable.

Share capital

Share capital	12 Months Ended
	Dec. 31, 2017
Share capital [abstract]
Share capital	20 Share capital 2017 201 6 Number of shares Share capital Number of shares Share capital RMB '000 RMB '000 As at 1 January and 31 December A shares 10,500,000,000 10,500,000 10,500,000,000 10,500,000 Overseas listed foreign shares 4,700,383,440 4,700,383 4,700,383,440 4,700,383 Total 15,200,383,440 15,200,383 15,200,383,440 15,200,383

Perpetual corporate bonds

Perpetual corporate bonds	12 Months Ended
	Dec. 31, 2017
Perpetual corporate bonds [abstract]
Perpetual Corporate Bonds	21 Perpetual Corporate Bonds (a) Perpetual corporate bonds as at 31 December 2017 format only Type of Bonds Issuance Date Category Initial Annual Distribution Rates Issue Price Number Par Value Initial Period Conversion Condition Conversion Result RMB '000 RMB '000 Bond A September 2017 Equity Instrument 5.05% 0.1 25,000,000 2,500,000 3 Years None None Bond B September 2017 Equity Instrument 5.17% 0.1 25,000,000 2,500,000 5 years None None Total 5,000,000 (b) Major Provisions In 2017, the Company issued perpetual corporate bonds with the aggregate net proceeds of approximate RMB5,000 million. The perpetual corporate bonds are issued at par value with initial annual distribution rate of 5.05% and 5.17%. The interests of the perpetual corporate bonds are recorded as distributions, which are paid annually in arrears in September in each year and may be deferred at the discretion of the Company unless compulsory distribution payment events (distributions to ordinary shareholders of the Company or reduction of the registered capital of the Company) occurred. The perpetual corporate bonds have no fixed maturity date and are callable at the Company's discretion in whole in August 2020 and 2022 respectively, the payment of the principal may be deferred for each renewal period as 3 and 5 years. The applicable distribution rate will be reset on first call date and each renewal period after first call date, to the sum of the applicable benchmark interest rate, the initial spread and 300 basis points per annum. The perpetual corporate bonds were recorded as equity in the consolidated financial statements. During the year ended 31 December 2017, the profit attributable to holders of perpetual corporate bonds, based on the applicable distribution rate, was RMB69 million. (c) Changes of perpetual corporate bonds during 2017 The perpetual corporate bonds were recorded as equity in the consolidated financial statements. During the year ended 31 December 2017, the profit attributable to holders of perpetual corporate bonds, based on the applicable distribution rate, was RMB69 million. As at 1 January 2017 Issurance Cumulative Interests As at 31 December 2017 Type of Bonds Number Amount Number Amount Number Amount RMB '000 RMB '000 RMB '000 RMB '000 Bond A - - 25,000,000 2,499,975 33,897 25,000,000 2,533,872 Bond B - - 25,000,000 2,499,975 34,703 25,000,000 2,534,678 Total - - 50,000,000 4,999,950 68,600 50,000,000 5,068,550

Surplus reserves

Surplus reserves	12 Months Ended
	Dec. 31, 2017
Surplus reserves [abstract]
Surplus reserves	22 Surplus reserves As at 1 January 2017 and 31 December 2017 Surplus reserves 8,140,030 According to the Company Law of the PRC, the Company's articles of association and board resolutions, the Company appropriates 10% of each year's net profit under PRC GAAP to the statutory surplus reserve. The Company has the option to cease provision for such reserve when it reaches 50% of the registered share capital. Upon the approval from relevant authorities, this reserve can be used to make up any losses incurred or to increase share capital. Except for offsetting against losses, this reserve cannot fall below 25% of the registered share after being used to increase share capital. As the statutory surplus reserve reaches 50% of the registered share capital in 2017, the Company made no provision this year. Appropriation of discretionary surplus reserve is proposed by the Board of Directors, and approved by the general meeting of shareholders. This reserve can be used to make up any losses incurred in prior years or to increase the share capital after obtaining relevant approvals. For the years ended 31 December 2017 and 2016, no provision was made to the discretionary surplus reserve. According to the articles of association, in distributing the Company's profits after tax for the relevant accounting year, the lower of amounts determined in accordance with PRC GAAP and IFRS shall be adopted. As at 31 December 2017, in accordance with PRC GAAP and IFRS, the balance of retained earnings for the Company and its subsidiaries amounted to approximately RMB31.965 billion and RMB35.793 billion, respectively.

Dividends

Dividends	12 Months Ended
	Dec. 31, 2017
Dividends [abstract]
Dividends	23 Dividends On 13 March 2018 the Board of Directors proposed a cash dividend of RMB0.1 per share, totaling approximately RMB1,520 million. This proposal is subject to the approval of the shareholders at the annual general meeting. On 13 June 2017, upon the approval from the annual general meeting of the shareholders, the Company declared 2016 final dividend RMB0.29 (2015: RMB0.47) per ordinary share, totaling approximately RMB4,408 million (2015: RMB7,144 million).

Long-term loans

Long-term loans	12 Months Ended
	Dec. 31, 2017
Long-term loans [abstract]
Long-term loans	24 Long-term loans Long-term loans comprised the following: As at 31 December 2017 2016 Loans from Huaneng Group and its subsidiaries (a) 7,427,183 3,818,807 Bank loans and other loans (b) 117,702,233 70,732,439 125,129,416 74,551,246 Less: Current portion of long-term loans 18,098,458 9,560,885 Total 107,030,958 64,990,361 (a) Loans from Huaneng Group and its subsidiaries Details of loans from Huaneng Group and its subsidiaries are as follows: As at 31 December 2017 Original currency RMB equivalent Less: Current portion Non current portion Annual interest rate 000 Loans from Huaneng Group Unsecured RMB - Variable rate 665,225 665,225 - 665,225 4.75 % Loans from Huaneng Finance Unsecured RMB - Variable rate 2,794,780 2,794,780 244,500 2,550,280 4.28%-4.66 % Loans from Huaneng Tiancheng Financial Leasing Co., Ltd. ("Tiancheng Financial Leasing") Secured RMB - Variable rate 3,967,178 3,967,178 1,878,994 2,088,184 4.06%-4.51 % Total 7,427,183 2,123,494 5,303,689 As at 31 December 2016 Original currency RMB equivalent Less: Current portion Non current portion Annual interest rate 000 Loans from Huaneng Group Unsecured RMB - Variable rate 665,015 665,015 640,485 24,530 4.75 % Loans from HIPDC Unsecured RMB - Variable rate 210 210 - 210 4.75 % Loans from Huaneng Finance Unsecured RMB - Variable rate 286,000 286,000 60,000 226,000 4.41%-4.75 % Loans from Huaneng Tiancheng Financial Leasing Secured RMB - Variable rate 2,867,582 2,867,582 154,737 2,712,845 4.42 % Total 3,818,807 855,222 2,963,585 (b) Bank loans and other loans Details of bank loans and other loans are as follows: As at 31 December 2017 Original currency RMB equivalent Less: Current portion Non current portion Annual interest rate 000 Secured RMB - Fixed rate 7,080,379 7,080,379 1,213,150 5,867,229 4.41%-4.90% - Variable rate 4,117,055 4,117,055 657,231 3,459,824 4.66%-4.90% Unsecured RMB - Fixed rate 14,981,859 14,981,859 3,179,426 11,802,433 2.00%-5.00% - Variable rate 76,467,082 76,467,082 10,013,829 66,453,253 1.80%-6.03% US$ - Variable rate 347,676 2,271,785 418,163 1,853,622 1.74%/2.26% S$ - Variable rate 2,538,619 12,396,329 419,570 11,976,759 2.73%/4.25% € - Fixed rate 30,463 237,680 67,207 170,473 1.30%-2.15% JPY - Fixed rate 2,592,661 150,064 6,388 143,676 0.75% Total 117,702,233 15,974,964 101,727,269 As at 31 December 2016 Original currency RMB equivalent Less: Current portion Non current portion Annual interest rate 000 Secured RMB - Fixed rate 8,305,310 8,305,310 1,202,430 7,102,880 4.41%-4.90% - Variable rate 760,500 760,500 56,800 703,700 4.66%-4.90% Unsecured RMB - Fixed rate 15,896,017 15,896,017 2,515,343 13,380,674 2.65%-5.00% - Variable rate 30,095,494 30,095,494 4,270,910 25,824,584 4.17%-5.65% US$ - Variable rate 409,760 2,842,505 388,925 2,453,580 1.92% S$ - Variable rate 2,580,522 12,385,213 196,410 12,188,803 2.76%/4.25% € - Fixed rate 39,187 286,329 68,271 218,058 2.00%/2.15% JPY - Fixed rate 2,702,533 161,071 6,574 154,497 0.75% Total 70,732,439 8,705,663 62,026,776 As at 31 December 2017, long-term loans of RMB4,605 million (31 December 2016: RMB2,902 million) were secured by certain property, plant and equipment with net book value amounting to approximately RMB5,167 million (31 December 2016: RMB3,105 million). Thereinto, certain subsidiaries of the Company had the sales and leaseback agreements with Tiancheng Financial Leasing and other financial leasing companies in previous years. According to the agreements, these subsidiaries have an option to buy back the equipment at a nominal price (RMB1) when the lease term expires. The substance of the transaction was to obtain financing secured by relevant assets within the leasing period. As at 31 December 2017, the equipment mentioned above has a total carrying amount of RMB4,064 million and RMB1,103 million (31 December 2016: RMB2,999 million and RMB0 million) while the long-term borrowings is RMB3,967 million and RMB638 million (31 December 2016: RMB2,868 million and RMB0 million) from Tiancheng Financial Leasing and other financial leasing companies, respectively. As at 31 December 2017, long-term loans of approximately RMB10,559 million were secured by future electricity and heat revenue (31 December 2016: RMB9,032 million). The maturity of long-term loans is as follows: Loans from Huaneng Group and its subsidiaries Bank loans and other loans As at 31 December As at 31 December 2017 2016 2017 2016 RMB '000 RMB '000 1 year or less 2,123,494 855,222 15,974,964 8,705,663 More than 1 year but no more than 2 years 1,689,582 715,400 19,039,483 11,420,746 More than 2 years but no more than 3 years 1,281,082 953,082 18,624,576 11,081,242 More than 3 years but no more than 4 years 294,020 928,082 16,388,976 7,769,955 More than 4 years but no more than 5 years 728,225 232,021 11,927,930 7,618,953 More than 5 years 1,310,780 135,000 35,746,304 24,135,880 7,427,183 3,818,807 117,702,233 70,732,439 Less: amount due within 1 year included under current liabilities 2,123,494 855,222 15,974,964 8,705,663 Total 5,303,689 2,963,585 101,727,269 62,026,776 The interest payment schedule of long-term loans in the future years are summarized as follows: As at 31 December 2017 2016 1 year or less 5,071,743 2,987,045 More than 1 year but not more than 2 years 4,225,736 2,577,363 More than 2 years but not more than 5 years 7,903,397 4,912,222 More than 5 years 4,864,084 3,133,578 Total 22,064,960 13,610,208

Long-term bonds

Long-term bonds	12 Months Ended
	Dec. 31, 2017
Long-term bonds [abstract]
Long-term bonds	25 Long-term bonds The Company issued bonds with maturity of 5 years, 7 years and 10 years in December 2007 with face values of RMB1 billion, RMB1.7 billion and RMB3.3 billion bearing annual interest rates of 5.67%, 5.75% and 5.90%, respectively. The total actual proceeds received by the Company were approximately RMB5.885 billion. These bonds are denominated in RMB and issued at par. Interest is payable annually while principal will be paid when the bonds fall due. The annual effective interest rates of those bonds are 6.13%, 6.10% and 6.17%, respectively. Interest paid per annum during the tenure of the bonds is RMB57 million, RMB98 million and RMB195 million, respectively. The bond with original maturity of 5 years had matured in December 2012 and the Company repaid the principal of RMB1 billion. The bond with original maturity of 7 years had matured in December 2014 and the Company repaid the principal of RMB1.7 billion. The bond with original maturity of 10 years had matured in December 2017 and the Company repaid the principal of RMB3.3 billion. The Company also issued bonds with maturity of 10 years in May 2008 with a face value of RMB4 billion bearing an annual interest rate of 5.20%. The actual proceeds received by the Company were approximately RMB3.933 billion. These bonds are denominated in RMB and issued at par. Interest is payable annually while principal will be paid when the bonds fall due. The annual effective interest rate of bond is 5.42%. Interest paid per annum during the tenure of the bonds is RMB208 million. As at 31 December 2017, interest payable for these bonds amounted to approximately RMB135.06 million (31 December 2016: RMB135.06 million). The Company issued medium-term notes with maturity of 5 years in July 2014 with a face value of RMB4 billion bearing an annual interest rate of 5.30%. The actual proceeds received by the Company were approximately RMB3.988 billion. These notes are denominated in RMB and issued at par. Interest is payable annually while principal will be paid when the notes fall due. The annual effective interest rate of these notes is 5.37%. Interest paid per annum during the tenure of the notes is RMB212 million. As at 31 December 2017, interest payable for the bonds amounted to approximately RMB99.32 million (31 December 2016: RMB99.32 million). The Company issued corporate bonds with maturity of 5 years and 10 years in June 2016 with face values of RMB3 billion and RMB1.2 billion bearing annual interest rates of 3.48% and 3.98%, respectively. The total actual proceeds received by the Company were approximately RMB4.2 billion. These bonds are denominated in RMB and issued at par. Interest is payable annually while principal will be paid when the bonds fall due. The annual effective interest rates of those bonds are 3.48% and 3.98%, respectively. Interest paid per annum during the tenure of the bonds is RMB104.40 million and RMB47.76 million, respectively. As at 31 December 2017, interest payable for the bonds amounted to approximately RMB57.78 million (31 December 2016: RMB57.78 million) and RMB26.43 million (31 December 2016: RMB26.43 million), respectively. The Company issued medium-term notes with maturity of 5 years in July 2017 with a face value of RMB5 billion bearing an annual interest rate of 4.69%. The actual proceeds received by the Company were approximately RMB5 billion. These notes are denominated in RMB and issued at par. Interest is payable annually while principal will be paid when the notes fall due. The annual effective interest rate of those notes is 4.69%. Interest paid per annum during the tenure of the notes is RMB234.50 million. As at 31 December 2017, interest payable for the notes amounted to approximately RMB111.15 million. The Company issued debt financing instrument with maturity of 3 years in July 2017 with a face value of RMB500 million bearing an annual interest rate of 4.75%. The actual proceeds received by the Company were approximately RMB499 million. These bonds are denominated in RMB and issued at par. Interest is payable annually while principal will be paid when the bonds fall due. The annual effective interest rate of those bonds is 4.82%. Interest paid per annum during the tenure of the bonds is RMB23.75 million. As at 31 December 2017, interest payable for the bonds amounted to approximately RMB11.02 million. The Company issued corporate bonds with maturity of 3 years in November 2017 with a face values of RMB2.3 billion bearing an annual interest rates of 4.99%. The actual proceeds received by the Company were approximately RMB2.299 billion. These bonds are denominated in RMB and issued at par. Interest is payable annually while principal will be paid when the bonds fall due. The annual effective interest rate of those bonds is 4.99%. Interest paid per annum during the tenure of the bonds is RMB114.77 million, respectively. As at 31 December 2017, interest payable for the bonds amounted to approximately RMB17.61 million. Please refer to Note 36(c) for details of long-term bonds of the Company guaranteed by HIPDC and government-related banks.

Other non-current liabilities

Other non-current liabilities	12 Months Ended
	Dec. 31, 2017
Other non-current liabilities [abstract]
Other non-current liabilities	26 Other non-current liabilities As at 31 December 2017 2016 Finance lease payables(a) 1,600,106 1,088,846 Government grants -Environmental subsidies(b) 1,245,810 1,122,406 -Other government grants 179,226 174,216 Other deferred income 1,825,614 379,615 Others 969,052 870,597 Subtotal 5,819,808 3,635,680 Current portion of finance lease payables (470,985 ) (568,645 ) Current portion of other non-current liabilities (64,361 ) (247,537 ) Subtotal (535,346 ) (816,182 ) Total 5,284,462 2,819,498 (a) The Company and its subsidiaries had obligation under finance leases as follows: As at 31 December 2017 2016 Within 1 year 500,790 605,806 After 1 year but within 2 years 312,125 266,792 After 2 years but within 3 years 281,990 82,470 After 3 years 674,256 181,345 1,769,161 1,136,413 Less: total future interest expense 169,055 47,567 Total 1,600,106 1,088,846 (b) This primarily represented subsidies for the construction of desulphurization equipment and other environmental protection projects. (c) In 2017, the asset-related government grants which were credited to the statement of comprehensive income amounted to RMB140.13 million (2016: RMB102.21 million).

Accounts payable and other liab

Accounts payable and other liabilities	12 Months Ended
	Dec. 31, 2017
Accounts payable and other liabilities [abstract]
Accounts payable and other liabilities	27 Accounts payable and other liabilities Accounts payable and other liabilities comprised: As at 31 December 2017 2016 Accounts and notes payable 15,496,475 12,059,004 Payables to contractors for construction 14,491,632 10,832,444 Retention payables to contractors 2,008,106 1,445,383 Amounts received in advance 1,504,926 365,887 Accrued interests 947,302 676,462 Others 4,451,691 3,367,437 Total 38,900,132 28,746,617 Please refer to Note 36(a)(iv) for details of accounts payable and other liabilities due to the related parties. As at 31 December 2017 and 2016, there was no notes payable secured by notes receivable. The carrying amounts of financial liabilities (excluding amounts received in advance) included in accounts payable and other liabilities are denominated in the following currencies: As at 31 December 2017 2016 RMB 36,399,243 27,222,632 S$ (RMB equivalent) 556,881 669,797 US$ (RMB equivalent) 436,358 479,179 JPY (RMB equivalent) 2,469 6,917 EUR (RMB equivalent) 255 2,205 Total 37,395,206 28,380,730 The ageing analysis of accounts and notes payable was as follows: As at 31 December 2017 2016 Within 1 year 15,201,380 11,902,522 Between 1 to 2 years 196,082 100,092 Over 2 years 99,013 56,390 Total 15,496,475 12,059,004

Taxes payable

Taxes payable	12 Months Ended
	Dec. 31, 2017
Taxes payable [abstract]
Taxes payable	28 Taxes payable Taxes payable comprises: As at 31 December 2017 2016 VAT payable 619,329 439,304 Income tax payable 430,703 440,791 Others 252,178 209,010 Total 1,302,210 1,089,105

Short-term bonds

Short-term bonds	12 Months Ended
	Dec. 31, 2017
Short-term bonds [abstract]
Short-term bonds	29 Short-term bonds The Company issued unsecured super short-term bonds with face values of RMB3 billion and RMB3 billion bearing annual interest rates of 2.50% and 2.60% in August 2016 and October 2016. Such bonds are denominated in RMB, issued at par and mature in 365 days. The annual effective interest rates of these bonds are 2.91% and 3.01%.The bonds had matured and were fully repaid in August 2017 and October 2017 respectively. The Company issued unsecured super short-term bonds with face values of RMB4 billion, RMB3 billion, RMB3 billion, RMB4 billion, RMB2 billion, RMB3 billion and RMB2 billion bearing annual interest rates of 2.42%, 2.62%, 2.73%, 2.50%, 2.79%, 2.98% and 3.45% in April 2016, April 2016, May 2016, July 2016, November 2016, November 2016 and December 2016, respectively. Such bonds are denominated in RMB, issued at face value and mature in 270 days, 270 days, 270 days, 270 days, 270 days, 180 days and 270 days from the issuance dates. The annual effective interest rates of these bonds are 2.73%, 2.93%, 3.04%, 2.81%, 3.10%, 3.19%, and 3.78%, respectively. These bonds were fully repaid in January 2017, January 2017, February 2017, April 2017, August 2017, May 2017, and September 2017, respectively. The Company issued unsecured super short-term bonds with face values of RMB4 billion RMB3 billion, RMB3 billion RMB4 billion, RMB2 billion, RMB4 billion, RMB4 billion, RMB2 billion, RMB1 billion and RMB4 billion bearing annual interest rates of 3.40%, 3.67%, 3.60%, 3.60%, 4.19%, 3.96% 4.10%, 4.19%, 4.17% and 4.17% in January 2017, February 2017, March 2017, April 2017, June 2017, August 2017, October 2017, November 2017, November 2017 and December 2017, respectively. Such bonds are denominated in RMB, issued at face value and mature in 270 days, 270days, 180 days, 90 days, 150 days, 60 days, 180 days, 180 days, 180 days and 90 days from the issuance dates. The annual effective interest rates of these bonds are 3.85%, 3.76%, 3.76%, 3.68%, 4.24%, 4.00%, 4.22%, 4.35%, 4.19%, and 4.35%, respectively. The six bonds issued in January 2017, February 2017, March 2017, April 2017, June 2017 and August 2017 were fully repaid in October 2017, November 2017, September 2017, July 2017, November 2017 and October 2017, respectively. As at 31 December 2017, interest payables for the outstanding bonds amounted to approximately RMB33.70 million, RMB10.80 million, RMB4.57 million and RMB14.17 million, respectively.

Short-term loans

Short-term loans	12 Months Ended
	Dec. 31, 2017
Short-term loans [abstract]
Short-term loans	30 Short-term loans Short-term loans are as follows: As at 31 December 2017 As at 31 December 2016 Original currency RMB equivalent Annual interest rate Original currency RMB equivalent Annual interest rate '000 '000 Secured RMB - Fixed rate 24,000 24,000 4.71%-5.50 % 13,500 13,500 3.00 % - Variable rate - - 112,034 112,034 2.77%-3.80 % Unsecured RMB - Fixed rate 10,450,248 10,450,248 3.92%-4.35 % 3,319,947 3,319,947 3.70%-4.35 % - Variable rate 69,777,100 69,777,100 3.74%-4.35 % 54,223,393 54,223,393 3.57%-4.35 % Total 80,251,348 57,668,874 As at 31 December 2017, short-term loans of RMB24million (31 December 2016: RMB126 million) represented the notes receivable that were discounted with recourse. As these notes receivable had not yet matured, the proceeds received were recorded as short-term loans. As at 31 December 2017, a short-term loan borrowed from Xi'an Thermal Power Research Institute Co., Ltd ("Xi'an Thermal") amounted to RMB100 million (31 December 2016: 100 million) with annual interest rate of 4.13%(31 December 2016: 3.92%). As at 31 December 2017, short-term loans borrowed from Huaneng Finance amounted to RMB6,505 million (31 December 2016: RMB3,355 million) with annual interest rate ranged from 3.92% to 4.35%(31 December 2016: from 3.92% to 4.13%). As at 31 December 2017, short-term loans borrowed from a subsidiary of Huaneng Energy & Communications Holdings Co., Ltd. amounted to RMB753 million (31 December 2016: RMB0 million) with annual interest rate ranged from 3.92% to 4.13%(31 December 2016:nil).

Deferred income tax assets and

Deferred income tax assets and liabilities	12 Months Ended
	Dec. 31, 2017
Deferred income tax assets and liabilities [abstract]
Deferred income tax assets and liabilities	31 Deferred income tax assets and liabilities The deferred income tax assets and liabilities are as follows: As at 31 December 2017 2016 Deferred income tax assets before offsetting 3,604,577 2,432,552 Offset amount (1,304,486 ) (1,168,595 ) Deferred income tax assets after offsetting 2,300,091 1,263,957 Deferred income tax liabilities before offsetting (5,871,166 ) (3,431,347 ) Offset amount 1,304,486 1,168,595 Deferred income tax liabilities after offsetting (4,566,680 ) (2,262,752 ) (2,266,589 ) (998,795 ) The gross movement on the deferred income tax accounts is as follows: 2017 2016 2015 Beginning of the year (998,795 ) (1,429,752 ) (926,481 ) Business combination (Note 40) (2,322,513 ) (58,929 ) (1,007,147 ) Disposal of subsidiaries (Note 6) 17,407 - - Credited to profit or loss (Note 33) 724,712 440,817 687,206 Charged to other comprehensive income 330,834 87,775 (198,525 ) Currency translation differences (18,234 ) (38,706 ) 15,195 End of the year (2,266,589 ) (998,795 ) (1,429,752 ) The movements in deferred income tax assets and liabilities during the year, without taking into consideration the offsetting of balances within the same tax jurisdictions, are as follows: Deferred income tax assets: Hedging reserve Amortization of land use rights Provision for impairment loss Depreciation Accrued expenses VAT refunds on purchases of domestically manufactured equipment Unused tax losses Others Total As at 1 January 2016 199,876 14,417 399,418 572,379 40,938 230,442 235,984 696,403 2,389,857 Business combination - - 66,560 6,840 - - - - 73,400 (Charged)/credited to profit or loss - (502 ) 140,969 (41,015 ) 1,185 (25,433 ) (5,128 ) 71,610 141,686 Charged to other comprehensive income (182,400 ) - - - - - - - (182,400 ) Currency translation differences - - 207 - - - 132 9,670 10,009 As at 31 December 2016 17,476 13,915 607,154 538,204 42,123 205,009 230,988 777,683 2,432,552 Business combination(Note 40) - - - 574,600 5,052 - 139,387 414,891 1,133,930 Disposal of subsidiaries(Note 6) - - (10,686 ) (9,962 ) - - (5,566 ) (52,270 ) (78,484 ) (Charged)/credited to profit or loss - (493 ) (2,593 ) (70,209 ) 7,076 (25,433 ) 196,613 20,026 124,987 Charged to other comprehensive income (11,905 ) - - - - - - - (11,905 ) Currency translation differences - - 82 - - - - 3,415 3,497 As at 31 December 2017 5,571 13,422 593,957 1,032,633 54,251 179,576 561,422 1,163,745 3,604,577 Deferred income tax liabilities: Hedging reserve Fair value gains Amortization of land use rights Depreciation Power generation license Mining rights Territorial water use right Others Total As at 1 January 2016 - (645,242 ) (904,173 ) (1,291,706 ) (625,460 ) (157,215 ) (74,201 ) (121,612 ) (3,819,609 ) Business combination - - (10,423 ) - - - - (121,906 ) (132,329 ) Credited to profit or loss - - 24,948 169,088 - 27,832 1,769 75,494 299,131 (Charged)/credited to other comprehensive loss (26,530 ) 296,705 - - - - - - 270,175 Currency translation differences 8,131 - (1,507 ) (26,436 ) (28,903 ) - - - (48,715 ) As at 31 December 2016 (18,399 ) (348,537 ) (891,155 ) (1,149,054 ) (654,363 ) (129,383 ) (72,432 ) (168,024 ) (3,431,347 ) Business combination (Note 40) - (1,736 ) (148,129 ) (3,209,672 ) - - - (96,906 ) (3,456,443 ) Disposal of subsidiaries(Note 6) - - 1,761 22,162 - - 68,696 3,272 95,891 Credited to profit or loss - - 27,457 525,780 - - 1,327 45,161 599,725 (Charged)/credited to other comprehensive loss (5,558 ) 348,297 - - - - - - 342,739 Currency translation differences (304 ) - (540 ) (9,490 ) (11,397 ) - - - (21,731 ) As at 31 December 2017 (24,261 ) (1,976 ) (1,010,606 ) (3,820,274 ) (665,760 ) (129,383 ) (2,409 ) (216,497 ) (5,871,166 ) As at 31 December 2017 and 2016, taxable temporary differences relating to interest in equity method investees amounted to RMB2.95 billion and RMB3.39 billion, respectively. No deferred tax liabilities were recognized as at 31 December 2017 and 2016 as dividends from investments in associates and joint ventures are exempted from the PRC income tax and the Company has no plan to dispose any of these investees in the foreseeable future. As at 31 December 2017 and 2016, taxable temporary differences relating to the undistributed profit of a wholly-owned foreign subsidiary amounted to RMB3.06 billion and RMB3.54 billion, respectively. No deferred tax liabilities were recognized in respect of the tax that would be payable on the distribution of these retained profit as at 31 December 2017 and 2016 as the Company controls the dividend policy of the subsidiary, and it has been determined that it is probable that the profits will not be distributed in the foreseeable future. In accordance with the accounting policy set out in Note 2(u), the Company and its subsidiaries did not recognize deferred income tax assets in respect of certain deductible temporary differences and accumulated tax losses that can be carried forward against future taxable income as follow: As at 31 December 2017 2016 Deductible temporary differences 4,672,788 2,957,316 Unused tax losses 8,665,079 6,669,820 Total 13,337,867 9,627,136 The expiry dates of the tax losses of the Company and its subsidiaries for which no deferred income tax assets were recognized are summarized as follows: As at 31 December 2017 2016 Year of expiry 2017 - 1,841,365 2018 1,557,045 1,122,070 2019 1,579,066 1,195,811 2020 1,524,531 1,061,468 2021 1,558,573 1,449,106 2022 2,445,864 - Total 8,665,079 6,669,820

Additional financial informatio

Additional financial information to consolidated statements of financial position	12 Months Ended
	Dec. 31, 2017
Additional financial information to consolidated statements of financial position [abstract]
Additional financial information to the consolidated statements of financial position	32 Additional financial information to the consolidated statements of financial position As at 31 December 2017, the net current liabilities of the Company and its subsidiaries amounted to approximately RMB107,413 million (2016: RMB93,230 million). On the same date, total assets less current liabilities were approximately RMB240,639 million (2016: RMB184,643 million).

Income tax expense

Income tax expense	12 Months Ended
	Dec. 31, 2017
Income tax expense [abstract]
Income tax expense	33 Income tax expense For the year ended 31 December 2017 2016 2015 Current income tax expense 1,942,238 3,905,968 6,386,149 Deferred income tax (Note 31) (724,712 ) (440,817 ) (687,206 ) Total 1,217,526 3,465,151 5,698,943 No Hong Kong profits tax has been provided as there were no estimated assessable profits in Hong Kong for the year (2016: nil). The reconciliation of the effective income tax rate from the notional income tax rate is as follows: For the year ended 31 December 2017 2016 2015 Notional tax on profit before income tax expense, calculated at the applicable income tax rates in the countries concerned 26.13 % 25.16 % 25.11 % Effect of tax losses not recognized 18.45 % 1.58 % (0.12 %) Effect of deductible temporary differences not recognized 6.04 % (0.20 %) (0.16 %) Effect of non-taxable income (12.37 %) (2.89 %) (1.77 %) Effect of non-deductible expenses 7.05 % 1.09 % 1.37 % Others (1.84 %) 0.35 % 0.39 % Effective tax rate 43.46 % 25.09 % 24.82 % The Company and its PRC branches and subsidiaries are subject to income tax at 25%, except for certain PRC branches and subsidiaries that are tax exempted or taxed at preferential tax rates, as determined in accordance with the relevant PRC income tax rules and regulations for the years ended 31 December 2017 and 2016. Pursuant to Guo Shui Han [2009] No. 33, starting from 1 January 2008, the Company and its PRC branches calculate and pay income tax on a consolidated basis according to relevant tax laws and regulations. The original regulation specifying locations for power plants and branches of the Company to make enterprise income tax payments was abolished. The income tax of subsidiaries remains to be calculated individually based on their individual operating results. The income tax rate applicable to Singapore subsidiaries is 17% (2016: 17%).

Earnings per share

Earnings per share	12 Months Ended
	Dec. 31, 2017
Earnings per share [abstract]
Earnings per share	34 Earnings per share The basic earnings per share is calculated by dividing the consolidated net profit attributable to the equity holders of the Company by the weighted average number of the Company's outstanding ordinary shares during the year: 2017 2016 2015 Consolidated net profit attributable to equity holders of the Company 1,579,836 8,520,427 13,651,933 Less: cumulative distribution of perpetual corporate bonds 68,600 - - Consolidated net profit attributable to ordinary Shareholders of the Company 1,511,236 8,520,427 13,651,933 Weighted average number of the Company's outstanding ordinary shares ('000) 15,200,383 15,200,383 14,485,383 Basic and diluted earnings per share (RMB) 0.10 0.56 0.94 *Weighted average number of ordinary shares: 2017 2016 2015 '000 '000 '000 Issued ordinary shares at 1 January 15,200,383 15,200,383 14,420,383 Effect of share issue - - 65,000 Weighted average number of ordinary shares at 31 December 15,200,383 15,200,383 14,485,383 There was no dilutive effect on earnings per share since the Company had no dilutive potential ordinary shares for the years ended 31 December 2017 and 2016.

Notes to consolidated statement

Notes to consolidated statement of cash flows	12 Months Ended
	Dec. 31, 2017
Consolidated Statements of Cash Flows [abstract]
Notes to consolidated statement of cash flows	35 Notes to consolidated statement of cash flows Bank balances and cash comprised the following: As at 31 December 2017 2016 2015 Total bank balances and cash 9,364,823 7,881,630 7,537,813 Less: Restricted cash 82,433 71,129 59,563 Cash and cash equivalents as at year end 9,282,390 7,810,501 7,478,250 The bank balances and cash of the Company and its subsidiaries are denominated in the following currencies: As at 31 December 2017 2016 2015 RMB 8,213,100 6,691,911 5,847,363 S$ (RMB equivalent) 835,995 869,591 1,130,356 US$ (RMB equivalent) 315,535 319,944 559,761 JPY (RMB equivalent) 193 184 205 HK$ (RMB equivalent) - - 128 Total 9,364,823 7,881,630 7,537,813 There is no material non-cash investing and financing transactions for the years ended 31 December 2017 and 2016. The table below details changes in the Company and its subsidiaries' liabilities from financing activities, including both cash and non-cash changes. Liabilities arising from financing activities are liabilities for which cash flows were, or future cash flows will be, classified in the Company and its subsidiaries' consolidated cash flow statement as cash flows from financing activities: Items Loans Bonds Accrued interests Finance leases payables Interest rate swaps contracts (liabilities) As at 1 January 2017 132,220,120 42,788,810 676,462 1,088,846 169,201 (a) Business combination 47,562,251 - 85,380 521,083 - (b) Changes from financing cash flows: Proceeds from new bank loans 140,270,455 - - - - Repayment of bank loans (113,769,036 ) - - - - Proceeds from new bonds - 38,788,679 - - - Repayment of bonds - (50,300,000 ) - - - Capital element of finance lease rentals paid - - - (636,145 ) - Interest element of finance lease rentals paid - - - (58,874 ) - Interest paid - (885,000 ) (9,195,102 ) - - Others (3,135 ) (80,643 ) - - - (c) Exchange adjustments 82,298 - 2,095 235 - (d) Changes in fair value - - - - (38,558 ) (e) Other changes: New finance leases - - - 659,895 - Interest expenses - 747,377 8,902,402 99,225 - Capitalised borrowing costs - - 476,065 - - Disposal of subsidiaries (1,166,899 ) - - - - Others 184,710 - - (74,159 ) - As at 31 December 2017 205,380,764 31,059,223 947,302 1,600,106 130,643

Related party balances and tran

Related party balances and transactions	12 Months Ended
	Dec. 31, 2017
Related party balances and transactions [abstract]
Related party balances and transactions	36 Related party balances and transactions The related parties of the Company and its subsidiaries that had transactions with the Company and its subsidiaries are as follows: Names of related parties Nature of relationship Huaneng Group Ultimate parent company HIPDC Parent company Huaneng Energy & Communications Holdings Co., Ltd. and its subsidiaries Subsidiaries of Huaneng Group* Huaneng Property Co., Ltd. and its subsidiaries Subsidiaries of Huaneng Group Xi'an Thermal and its subsidiaries Subsidiaries of Huaneng Group Huaneng Group Technology Innovation Center A subsidiary of Huaneng Group Huaneng Hulunbuir Energy Development Company Ltd.and its subsidiaries Subsidiaries of Huaneng Group Alltrust Insurance Co., Ltd. A subsidiary of Huaneng Group North United Power Co., Ltd. and its subsidiaries Subsidiaries of Huaneng Group Huaneng Group Clean Energy Technology Research Institute Co., Ltd. A subsidiary of Huaneng Group Huaneng Renewables Corporation Limited and its subsidiaries Subsidiaries of Huaneng Group Huaneng Carbon Assets Management Company Limited A subsidiary of Huaneng Group Huaneng Group Hong Kong Limited A subsidiary of Huaneng Group Huaneng Lancangjiang Hydropower Co., Inc. and its subsidiaries Subsidiaries of Huaneng Group Changping Huaneng Training Center A subsidiary of Huaneng Group Huaneng Hainan Industry Co.,Ltd. A subsidiary of Huaneng Group Huaneng Baishan Coal Gangue Power Generation Co., Ltd. A subsidiary of Huaneng Group Great Wall Securities Co., Ltd. ("Great Wall Securities") A subsidiary of Huaneng Group Huaneng Nuclear Power Development Company Ltd. A subsidiary of Huaneng Group Huaneng Tibet Yarlung Zangbo River Hydropower Development & Investment Company Ltd. and its subsidiaries Subsidiaries of Huaneng Group Huaneng Xining Power Co., Ltd. A subsidiary of Huaneng Group Huaneng Coal Business Sector Co., Ltd. and its subsidiaries Subsidiaries of Huaneng Group Huaneng Integrated Industries Co., Ltd. A subsidiary of Huaneng Group Huaneng Ningxia Energy Company Ltd. A subsidiary of Huaneng Group Huaneng Shaanxi Power Generation Limited and its subsidiaries Subsidiaries of Huaneng Group Huaneng Xinjiang Energy Development Company Ltd. and its subsidiaries Subsidiaries of Huaneng Group Huaneng Gansu Energy Development Company Ltd. and its subsidiaries Subsidiaries of Huaneng Group Huaneng Capital Services Co., Ltd. A subsidiary of Huaneng Group Huaneng Shaanxi Qinling Power Generation Co., Ltd. A subsidiary of Huaneng Group Ningxia Daba Power Generation Co., Ltd. A subsidiary of Huaneng Group Huaneng Shandong Shidao Bay Nuclear Power Co., Ltd. A subsidiary of Huaneng Group Huangtai #8 Power Plant An investee with significant influence Shanghai Time Shipping A joint venture of the Company Jiangsu Nantong Power A joint venture of the Company Huaneng Yingkou Port Limited Liability Company A joint venture of the Company Luyi Power A joint venture of the Company Ruyi (Hong Kong) Energy and its subsidiaries Joint ventures of the Company Suzhou Sugao Renewables Service Co. Ltd. A joint venture of the Company Liaocheng Luxi Fuel Co., Ltd.Company An associate of the Company Zhengzhou Airport Xinggang Power Co., Ltd. An associate of the Company Names of related parties Nature of relationship Chongqing Huaneng Lime Company Limited An associate of the Company Hainan Nuclear An associate of the Company Sichuan Hydropower An associate of the Company and also a subsidiary of Huaneng Group Hanfeng Power An associate of the Company and also a subsidiary of Huaneng Group Tiancheng Financial Leasing An associate of the Company and also a subsidiary of Huaneng Group Huaneng Shidao Bay Nuclear Power Development Co., Ltd. An associate of the Company and also a subsidiary of Huaneng Group Xiapu Nuclear Power Co., Ltd. An associate of the Company and also a subsidiary of Huaneng Group Huaneng Finance An associate of the Company and also a subsidiary of Huaneng Group Huaneng (Tianjing) Coal Gasification Power Generation Co., Ltd. An associate of the Company and also a subsidiary of Huaneng Group Huaneng Group Fuel Company and its subsidiaries Associates of the Company and also subsidiaries of Huaneng Group Other government-related enterprises** Related parties of the Company * Transactions with subsidiaries of Huaneng Group which also are associates of the Company and its subsidiaries are presented as transactions with subsidiaries of Huaneng Group for note 36(a) and 36(b). ** Huaneng Group is a state-owned enterprise. In accordance with the revised IAS 24, "Related Party Disclosures", government-related enterprises, other than entities under Huaneng Group, which the PRC government has control, joint control or significant influence over are also considered as related parties of the Company and its subsidiaries ("other government-related enterprises"). The majority of the business activities of the Company and its subsidiaries are conducted with other government-related enterprises. For the purpose of the related party balances and transactions disclosure, the Company and its subsidiaries have established procedures to determine, to the extent possible, the identification of the ownership structure of its customers and suppliers as to whether they are government-related enterprises. However, many government-related enterprises have a multi-layered corporate structure and the ownership structures change over time as a result of transfers and privatization programs. Nevertheless, management believes that all material related party balances and transactions have been adequately disclosed. In addition to the related party information shown elsewhere in these financial statements, the following is a summary of significant related party transactions entered into in the ordinary course of business between the Company and its subsidiaries and their related parties during the year and significant balances arising from related party transactions as at year end. (a) Related party balances (i) Cash deposits in related parties As at 31 December 2017 2016 Deposits in Huaneng Finance - Savings deposit 7,506,706 5,155,000 Deposits in Great Wall Securities - Savings deposit - 2 Total 7,506,706 5,155,002 For the year ended 31 December 2017, the annual interest rates for these savings deposits placed with Huaneng Finance and Great Wall Securities ranged from 0.35% to 1.35% (2016: from 0.35% to 1.35%). (ii) As described in Note 24 and 30, certain loans of the Company and its subsidiaries were borrowed from Huaneng Group, HIPDC, Huaneng Finance, Xi'an Thermal, a subsidiary of Huaneng Energy & Communications Holdings Co., Ltd. and Tiancheng Financial Leasing. (iii) Except for those disclosed in Note 24 and 30, the majority of the balances with Huaneng Group, HIPDC, subsidiaries Accounts receivable, other receivables and assets comprised the following balances due from related parties: As at 31 December 2017 2016 Due from Huaneng Group 860,941 708 Due from HIPDC 99 - Due from joint ventures 360,442 806,112 Due from associates 89,083 - Due from subsidiaries of Huaneng Group 196,621 319,224 Due from Huangtai #8 Power Plant 903,671 - Total 2,410,857 1,126,044 (iv) Accounts payable and other liabilities and other non-current liabilities comprised the following balances due to related parties: As at 31 December 2017 2016 Due to Huaneng Group 260,306 12,232 Due to HIPDC 16,138 14,183 Due to joint ventures 336,170 325,590 Due to associates 5,751 263,154 Due to subsidiaries of Huaneng Group 4,239,688 4,145,595 Total 4,858,053 4,760,754 (v) As at 31 December 2017, included in long-term loans (including current portion) and short-term loans are loans payable to other government-related enterprises amounting to RMB203 billion (2016: RMB130 billion). The balances with government-related enterprises also included substantially all the accounts receivable due from domestic power plants of government-related power grid companies, the bank deposits placed with government-related financial institutions as well as accounts payables and other payables arising from the purchases of coal and property, plant and equipment construction and related labor service provided by other government-related enterprises. Except for bank deposits, these balances are unsecured and the majority of receivable/repayable is within one year. (vi) As at 31 December 2017, prepayment for construction materials to subsidiaries of Huaneng Group amounted to RMB21 million (2016: RMB67 million). (b) Related party transactions (i) Procurement of goods and receiving services For the year ended 31 December 2017 2016 2015 Huaneng Group Technical services and engineering contracting services - - 50 Other purchases 446 451 - Subsidiaries of Huaneng Group Purchase of coal and transportation services 19,945,752 17,212,984 16,575,700 Technical services and engineering contracting services 1,024,369 1,055,251 769,176 Purchase of equipment 347,163 483,058 302,387 Purchase of power generation quota - 195,528 287,779 Other purchases 716 6,472 7,073 Joint ventures of the Company Purchase of coal and transportation services 2,054,209 2,150,844 1,816,954 Entrusting other parties for power generation 28,953 - - An associate of the Company Other purchases 27,732 43,808 44,591 (ii) Sales of goods and providing services For the year ended 31 December 2017 2016 2015 Huaneng Group Service provided 907 - - HIPDC Service provided 520 - - Subsidiaries of Huaneng Group Sales of power generation quota - 1,165 135,085 Sales of goods 1,114,347 - - Other sales 15,247 189,914 40,780 Service provided 25,229 31,135 50,627 Provision of entrusted power generation 58,639 - - Joint ventures of the Company Service provided 319,844 59,049 133,332 Other sales 407,697 9,490 23,003 Other related party Provision of entrusted power generation - - 33,129 (iii) Other related party transactions For the year ended 31 December 2017 2016 2015 (1 ) Rental charge on leasehold HIPDC 106,885 157,264 161,941 Subsidiaries of Huaneng Group 141,542 128,932 130,591 A joint venture of the Company 2,128 - - (2 ) Rental income from leasehold A joint venture of the Company 7,448 7,750 10,759 Subsidiaries of Huaneng Group 2,509 5,724 9,115 (3 ) Drawdown of loans Subsidiaries of Huaneng Group 15,374,480 4,035,000 2,660,500 HIPDC - 210 - Huaneng group 665,225 - - (4 ) Interest expense on loans Huaneng group 33,481 30,514 32,573 HIPDC 10 13,136 114,687 Subsidiaries of Huaneng Group 589,012 217,098 158,695 (5 ) Interest income on loans A joint venture of the Company 3,329 3,488 4,572 An associate of the Company 917 - - A Subsidiary of Huaneng Group 4,344 - - For the year ended 31 December 2017 2016 2015 (6 ) Capital injection from a subsidiary of Huaneng Group A subsidiary of Huaneng Group 274,752 - 286,312 (7 ) Capital injection A subsidiary of Huaneng Group - 157,500 683,550 An associate of the Company 52,200 100,418 206,230 Joint ventures of the Company 249,716 18,200 - (8 ) Pre-construction cost paid by A subsidiary of Huaneng Group 23,529 765 12,254 An joint venture of the Company 179 - (9 ) Finance lease payments received from A subsidiary of Huaneng Group - 2,960,000 100,000 (10 ) Entrusted management fee Huaneng Group 13,453 24,950 24,950 (11 ) Trusteeship management income Huaneng Group 1,518 1,700 1,700 (12 ) Net proceeds received from investee with significant influence Huangtai #8 Power Plant 72,920 - - (13 ) Finance lease to investee with significant influence Huangtai #8 Power Plant 86,946 - - (14 ) Interest income from finance lease Huangtai #8 Power Plant 11,626 - - (15 ) Acquisition consideration In 2017, the Company acquired subsidiaries from Huaneng Group, please refer to Note 40(a) for details of the acquisition consideration. (16 ) Disposal subsidiaries In 2017, the Company disposed Taishan Power Limited Company to a subsidiary of Huaneng Group, please refer to Note 6 for details. Transactions with government-related enterprises For the years ended 31 December 2017 and 2016, the Company and its domestic subsidiaries sold substantially all their products to local government-related power grid companies. Please refer to Note 5 for details of sales information to major power grid companies For the years ended 31 December 2017 and 2016, other collectively-significant transactions with government-related enterprises also include a large portion of fuel purchases, property, plant and equipment construction and related labor employed. (c) Guarantees As at 31 December 2017 2016 (i ) Long-term loans guaranteed by - Huaneng Group 1,675,147 565,992 - HIPDC 2,099,600 2,142,000 (ii ) Long-term bonds guaranteed by - HIPDC 4,000,000 4,000,000 - Government-related banks - 3,300,000 (d) Pre-tax benefits and social insurance of key management personnel For the year ended 31 December 2017 2016 2015 Salaries 7,676 8,225 9,064 Pension 1,511 1,521 1,470 Total 9,187 9,746 10,534 (e) Related party commitments Related party commitments which were contracted but not recognized in the consolidated statement of financial position as at the end of reporting period are as follows: (i) Capital commitments As at 31 December 2017 2016 Subsidiaries of Huaneng Group 290,041 439,571 (ii) Fuel purchase and transportation commitments As at 31 December 2017 2016 Subsidiaries of Huaneng Group 1,111,649 963,306 A joint venture of the Company 279,408 291,032 Total 1,391,057 1,254,338 (iii) Operating lease commitments As at 31 December 2017 2016 Subsidiaries of Huaneng Group 171,804 286,340 HIPDC 76,202 65,554 Total 248,006 351,894

Labor cost

Labor cost	12 Months Ended
	Dec. 31, 2017
Labor cost [abstract]
Labor cost	37 Labor cost Other than the salaries and staff welfare, the labor cost of the Company and its subsidiaries mainly comprises the following: All PRC employees of the Company and its subsidiaries are entitled to a monthly pension upon their retirements. The PRC government is responsible for the pension liability to these employees on retirement. The Company and its subsidiaries are required to make contributions to the publicly administered retirement plan for their PRC employees at a specified rate, currently set at 14% to 22% (2016: 14% to 22%) of the basic salary of the PRC employees. The retirement plan contributions paid by the Company and its subsidiaries for the year ended 31 December 2017 were approximately RMB1156 million (2016: RMB873 million), including approximately RMB1110 million (2016: RMB832 million) charged to profit or loss. In addition, the Company and its subsidiaries have also implemented a supplementary defined contribution retirement scheme for PRC employees. Under this scheme, the employees are required to make a specified contribution based on the number of years of service with the Company and its subsidiaries, and the Company and its subsidiaries are required to make a contribution equal to two to four times the employees' contributions. The employees will receive the total contributions upon their retirement. For the year ended 31 December 2017, the contributions to supplementary defined contribution retirement scheme paid by the Company and its subsidiaries amounted to approximately RMB312 million (2016: RMB244 million), including approximately RMB299 million (2016: RMB233 million) charged to profit or loss. SinoSing Power and its subsidiaries in Singapore appropriate a specified rate, currently set at 6.5% to 16% (2016: 6.5% to 16%) of the basic salary to central provident funds in accordance with the local government regulations. The contributions made by SinoSing Power and its subsidiaries for the year ended 31 December 2017 amounted to approximately RMB19.92 million (2016: RMB18.47 million), all of which were charged to profit or loss. The Company and its subsidiaries have no further obligation for post-retirement benefits beyond the annual contributions made above. In addition, the Company and its subsidiaries also make contributions of housing funds and social insurance to the social security institutions at specified rates of the basic salary and no more than the upper limit. The housing funds and social insurance contributions paid by the Company and its subsidiaries amounted to approximately RMB784 million (2016: RMB604 million) and RMB901 million (2016: RMB699 million) for the year ended 31 December 2017 including approximately RMB748 million (2016: RMB572 million) and RMB857 million (2016: RMB664 million) were charged to profit or loss, respectively.

Directors', supervisors' and se

Directors', supervisors' and senior management's emoluments	12 Months Ended
	Dec. 31, 2017
Directors', supervisors' and senior management's emoluments [abstract]
Directors', supervisors' and senior management's emoluments	38 Directors', supervisors' and senior management's emoluments (a) Pre-tax benefits and social insurance of directors and supervisors The remuneration of every director and supervisor of the Company for the year ended 31 December 2017 is set out below: Fees Basic salaries Performance salaries Pension Total Name of director Mr. Cao Peixi - - - - - Mr. Guo Junming 1 - - - - - Mr. Liu Guoyue - - - - - Mr. Fan Xiaxia 2 - - - - - Mr. Li Shiqi 3 - - - - - Mr. Huang Jian - - - - - Mr. Wang Yongxiang 4 - - - - - Mr. Mi Dabin 24 - - - 24 Mr. Guo Hongbo - - - - - Mr. Zhu Yousheng 3 24 - - - 24 Ms. Li Song 3 24 - - - 24 Mr. Cheng Heng 4 - - - - - Mr. Lin Chong 4 - - - - - Mr. Li Zhensheng 3 37 - - - 37 Mr. Yue Heng 74 - - - 74 Mr. Geng Jianxin 3 37 - - - 37 Mr. Xia Qing 3 37 - - - 37 Mr. Xu Mengzhou 74 - - - 74 Mr. Liu Jizhen 4 37 - - - 37 Mr. Xu Haifeng 4 37 - - - 37 Mr. Zhang Xianzhi 4 37 - - - 37 Sub-total 442 - - - 442 Name of supervisor Mr. Ye Xiangdong - - - - - Mr. Mu Xuan 24 - - - 24 Ms. Zhang Mengjiao - - - - - Mr. Gu Jianguo 24 - - - 24 Ms. Zhang Xiaojun - 137 466 124 727 Mr. Zhu Daqing - 135 464 123 722 Sub-total 48 272 930 247 1,497 Total 490 272 930 247 1,939 The remuneration of every director and supervisor of the Company for the year ended 31 December 2016 is set out below: Fees Basic salaries Performance salaries Pension Total Name of director Mr. Cao Peixi - - - - - Mr. Guo Junming - - - - - Mr. Liu Guoyue - - - - - Mr. Li Shiqi - - - - - Mr. Huang Jian - - - - - Mr. Fan Xiaxia - 327 396 122 845 Mr. Mi Dabin 48 - - - 48 Mr. Guo Hongbo - - - - - Mr. Zhu Yousheng 48 - - - 48 Ms. Li Song 48 - - - 48 Mr. Li Zhensheng 74 - - - 74 Mr. Zhang Shouwen 37 - - - 37 Mr. Yue Heng 74 - - - 74 Mr. Geng Jianxin 74 - - - 74 Mr. Xia Qing 74 - - - 74 Mr. Xu Mengzhou 37 - - - 37 Sub-total 514 327 396 122 1,359 Name of supervisor Mr. Ye Xiangdong - - - - - Mr. Mu Xuan 48 - - - 48 Ms. Zhang Mengjiao - - - - - Mr. Gu Jianguo 48 - - - 48 Mr. Wang Zhaobin - 51 - - 51 Ms. Zhang Ling - 69 - - 69 Ms. Zhang Xiaojun - 92 314 89 495 Mr. Zhu Daqing - 90 313 88 491 Sub-total 96 302 627 177 1,202 Total 610 629 1,023 299 2,561 The remuneration of every director and supervisor of the Company for the year ended 31 December 2015 is set out below: Fees Basic salaries Performance salaries Pension Total Name of director Mr. Cao Peixi - - - - - Mr. Guo Junming - - - - - Mr. Liu Guoyue - 143 663 123 929 Mr. Li Shiqi - - - - - Mr. Huang Jian - - - - - Mr. Fan Xiaxia - 356 494 131 981 Mr. Mi Dabin 65 - - - 65 Mr. Guo Hongbo 12 - - - 12 Mr. Zhu Yousheng 24 - - - 24 Mr. Xu Zujian 24 - - - 24 Ms. Li Song 65 - - - 65 Mr. Li Zhensheng 74 - - - 74 Mr. Qi Yudong 6 - - - 6 Mr. Zhang Shouwen 74 - - - 74 Mr. Yue Heng 100 - - - 100 Ms. Zhang Lizi 30 - - - 30 Mr. Geng Jianxin 37 - - - 37 Mr. Xia Qing 37 - - - 37 Sub-total 548 499 1,157 254 2,458 Name of supervisor Mr. Ye Xiangdong - - - - - Mr. Mu Xuan 65 - - - 65 Ms. Zhang Mengjiao - - - - - Mr. Gu Jianguo 49 - - - 49 Mr. Wang Zhaobin - 298 385 103 786 Ms. Zhang Ling - 133 263 53 449 Sub-total 114 431 648 156 1,349 Total 662 930 1,805 410 3,807 1 Resigned on 9 October 2017. 2 Resigned on 28 February 2018 3 Resigned on 13 June 2017. 4 Appointed on 13 June 2017. During the year, no option was granted to the directors or the supervisors (2016: nil). During the year, no emolument was paid to the directors or the supervisors (including the five highest paid employees) as an inducement to join or upon joining the Company or as compensation for loss of office (2016: nil). No director or supervisor had waived or agreed to waive any emoluments during the years 2017 and 2016. (b) Five highest paid individuals The five individuals whose emoluments were the highest in the Company and its subsidiaries for the year include no director (2016: one director) whose emoluments are reflected in the analysis presented above. The emoluments payable to the all five (2016: remaining four) individuals during the year (within the range of nil to RMB0.79 million) are as follows: As at 31 December 2017 2016 2015 Basic salaries 1,524 1,213 910 Performance salaries 1,800 1,440 1,260 Pension 648 502 365 3,972 3,155 2,535

Commitments

Commitments	12 Months Ended
	Dec. 31, 2017
Commitments [abstract]
Commitments	39 Commitments (a) Capital commitments Capital commitments mainly relate to the construction of new power projects, certain ancillary facilities and renovation projects for existing power plants. Details of such commitments are as follows: As at 31 December 2017 2016 Contracted but not provided 16,985,439 18,603,559 (b) Operating lease commitments The Company and its subsidiaries have various operating lease arrangements for land and buildings. Some of the leases contain renewal options and most of the leases contain escalation clauses. Lease terms do not contain restrictions on the Company and its subsidiaries' activities concerning dividends, additional debts or further leasing. Total future minimum lease payments under non-cancelable operating leases are as follows: As at 31 December 2017 2016 Land and buildings - not later than 1 year 196,870 181,441 - later than 1 year and not later than 2 years 118,272 144,088 - later than 2 years and not later than 5 years 143,628 133,984 - later than 5 years 1,028,014 970,896 Total 1,486,784 1,430,409 In addition, in accordance with a 30-year operating lease agreement signed by Huaneng Dezhou Power Plant ("Dezhou Power Plant") and Shandong Land Bureau for the land occupied by Dezhou Power Plant Phases I and II in June 1994, annual rental amounted to approximately RMB30 million effective from June 1994 and is subject to revision at the end of the fifth year from the contract date. Thereafter, the annual rental is subject to revision once every three years. The increment for each rental revision is restricted to no more than 30% of the previous annual rental amount. For the years ended 31 December 2017 and 2016, the annual rentals was approximately RMB34 million. (c) Fuel purchase commitments The Company and its subsidiaries have entered into various long-term fuel supply agreements with various suppliers in securing fuel supply for various periods. All the agreements require minimum, maximum or forecasted volume purchases and subject to certain termination provisions. Related purchase commitments are as follows: As at 31 December 2017 Periods Purchase quantities Estimated unit costs (RMB) A government-related enterprise 2018-2039 2.8 million m 3 2.21/ m 3 A government-related enterprise 2018-2023 541 million m 3 2.06/ m 3 2018-2023 450 million m 3 2.06/ m 3 2018-2023 541 million m 3 2.10/ m 3 2018-2023 450 million m 3 2.27/ m 3 A government-related enterprise 2018-2026 200 million m 3 2.38/ m 3 Other suppliers 2018-2019 243 BBtu**/day approximately 67,000/BBtu 2020-2021 242 BBtu**/day approximately 67,000/BBtu 2022 248 BBtu**/day approximately 67,000/BBtu 2023 247.5~256.6BBtu**/day approximately 67,000/BBtu 2024-2028 49.9-81.5BBtu**/day approximately 69,000/BBtu As at 31 December 2016 Periods Purchase quantities Estimated unit costs (RMB) A government-related enterprise 2017-2039 2.8 million m 3 2.31/ m 3 A government-related enterprise 2017-2023 541 million m 3 2.16/ m 3 2017-2023 450 million m 3 2.16/ m 3 Other suppliers 2017-2022 248BBtu**/day approximately 63,000/BBtu 2023 247.5-256.6BBtu**/day approximately 63,000/BBtu 2024-2028 49.9-59.0BBtu**/day approximately 70,000/BBtu * The quantities represent maximum volume, others represent minimum or forecasted volume if not specified. ** BBtu: Billion British Thermal Unit.

Business combinations

Business combinations	12 Months Ended
	Dec. 31, 2017
Business combinations [abstract]
Business combinations	40 Business combinations (a) Acquisition from Huaneng Group On 14 October 2016, the Company entered into equity transfer agreements with Huaneng Group to acquire: • 80% equity interests of Shandong Power • 100% equity interests of Jilin Power • 100% equity interests of Heilongjiang Power • 90% equity interests of Zhongyuan Gas These entities are all mainly engaged in power generation and sales business. The acquisition was completed on 1 January 2017(the acquisition date), when the Company obtained the control over above mentioned entities through the corresponding voting rights obtained and consolidated them in its financial statement. The acquisition is expected to increase its generation capacity in relevant areas. The acquired business contributed consolidated revenue of RMB31.207 billion and consolidated net loss of RMB1,051 million to the Company and its subsidiaries for the period from the date of acquisition to 31 December 2017. The total consideration is RMB15.501 billion after certain adjustment of the profits generated from the date of valuation to the acquisition date in accordance with the equity transfer agreements, which has been settled in cash by 31 December 2017 after netting off with the receivables due from Huaneng Group. Acquisition Date Total consideration 15,500,770 Non-controlling interests 6,292,577 Fair value of pre-existing interest in a subsidiary of Shandong Power 690,967 Less: Fair value of total identifiable net assets 19,316,748 Goodwill 3,167,566 Total consideration 15,500,770 Less: Net settlement of the receivables due from Huaneng Group 2,361,871 Bank balances and cash of acquirees 2,342,766 Less: Restricted cash (20,974 ) Cash consideration paid for acquisition of subsidiaries, net of cash acquired 10,817,107 Goodwill arising from the acquisitions is attributable to the synergies expected to arise after the acquisitions of the equity interests in the subsidiaries stated above. None of the goodwill recognised is expected to be deductible for tax purposes. In addition, according to the profit compensation agreement associated with the Acquisition, Huaneng Group should compensate the Company in cash based on the shortfall of accumulated actual net profit compared with the accumulated forecast net profit of certain subsidiaries of Shandong Power during the compensation period from year 2017 to 2019. As at 31 December 2017, the fair value of above mentioned contingent consideration from Huaneng Group amounted to RMB860 million was recognized (as at acquisition date: nil), which was recorded in other receivables and assets of RMB615 million, and other non-current assets of RMB 245 million, respectively. The actual amount of compensation will be adjusted in line with the actual performance of those subsidiaries in 2018 and 2019. The Company incurred acquisition related cost amounted RMB26 million for financial advisory, legal and audit fees. The assets and liabilities arising from the acquisitions of above entities are as follows: Shandong Power (consolidated) Fair value Jilin Power (consolidated) Fair value Heilongjiang Power (consolidated) Fair value Zhongyuan Gas Fair value Property, plant and equipment 41,366,757 8,496,028 12,525,071 1,381,060 Investment in associates and joint ventures 1,021,566 - - - Available-for-sale financial assets 4,000 100,895 - - Land use rights 2,272,181 228,173 655,485 27,075 Deferred income tax assets 334,055 323,522 10,404 - Other non-current assets 1,285,838 213,589 210,965 48 Bank balances and cash 1,621,276 103,045 385,295 222,939 Inventories 952,510 89,333 123,889 1,136 Trade receivables 2,509,641 293,455 127,219 124,636 Other receivables and other current assets 2,992,094 2,393,835 889,392 119,974 Long-term borrowings (15,647,367) (8,330,929) (6,742,580) (1,200,000) Deferred income tax liabilities (2,447,672) (214,642) (280,945) (47,235) Other non-current liabilities (1,688,306) (10,291) (253,671) - Short-term borrowings (8,082,200) (600,000) (1,920,000) - Tax payables (270,531) (10,311) (54,302) (419) Dividends payables (136,955) - - - Salary and welfare payables (41,667) (2,969) (22,462) (717) Payables and other liabilities (9,725,591) (2,668,626) (3,083,130) (606,115) Total identifiable net assets 16,319,629 404,107 2,570,630 22,382 The fair value of the identifiable assets and liabilities acquired in the acquisition were assessed based on independent valuation prepared by external valuers . (b) A subsidiary transferred from a joint venture Shanxi Xiaoyi Economic Development Zone Huaneng Energy Service Co., Ltd. ('Shanxi Xiaoyi Energy') was previously a joint venture of the Company. In 2017, non-controlling shareholder with 49% equity interests in Shanxi Xiaoyi Energy entered into a voting in concert agreement with the Company whereby it agreed to vote the same in respect of significant financial and operating decisions made by the Company effective from 15 February 2017. As a result, the Company acquired control of Shanxi Xiaoyi Energy since 15 February 2017. Acquisition Date Non-controlling interests 10 Fair value of pre-existing interest in Shanxi Xiaoyi Energy 10,200 Less: Fair value of total identifiable net assets 10,210 Goodwill - Shanxi Xiaoyi Energy is a limited liability company established on 8 October 2016 in Xiaoyi, Shanxi Province. Shanxi Xiaoyi Energy is primarily engaging in selling of electricity, construction, operation and maintenance of power distribution and regional transmission and distribution grid. Financial information of Shanxi Xiaoyi Energy is as follows: From acquisition date to 31 December 2017 acquiree's Revenue Net Profit Shanxi Xiaoyi Energy 704 228 The identifiable assets and liabilities of Shanxi Xiaoyi Energy as at the acquisition date are as follows: Fair Value Bank balances and cash 10,211 Accounts payable and other liabilities (1 ) Total identifiable net assets 10,210 (c) Acquisition of Ruzhou Xuji Wind Power Generation Co., Ltd. The Company has entered an Agreement on establishing Huaneng Ruzhou Clean Energy Co., Ltd. ("Ruzhou Clean Energy") with Beijing Xuji New Energy Technology Co., Ltd. ("Beijing Xuji") in 2017. The Company committed to contribute RMB76 million for 95% equity of Ruzhou Clean Energy. Beijing Xuji contributed the net identifiable assets of its wholly-owned subsidiary, Ruzhou Xuji Wind Power Generation Co., Ltd. ("Xuji Wind Power") which amounted to RMB4 million, for 5% equity of Ruzhou Clean Energy. Acquisition Date Consideration 4,000 Less: Fair value of total identifiable net assets 4,000 Goodwill - Xuji Wind Power was established on 23 November 2015 in Ruzhou, Henan Province, and is mainly engaged in wind power generation and photovoltaic power generation. On the acquisition date, the project is under construction. From the acquisition date to 31 December 2017, Xuji Wind Power had not commenced operation. From acquisition date to 31 December 2017 acquiree's Revenue Net Profit Xuji Wind Power - - The identifiable assets and liabilities of Xuji Wind Power as at the acquisition date are as follows: Fair Value Other receivables and assets 16,080 Property, plant and equipment 11,893 Accounts payable and other liabilities (23,973 ) Total identifiable net assets 4,000

Non-controlling interests

Non-controlling interests	12 Months Ended
	Dec. 31, 2017
Non-controlling interests [abstract]
Non-controlling interests	41 Non-controlling interests The following table summarizes the information relating to each of the Company and subsidiaries that have material non-controlling interests ("NCI"): Qinbei Power Beijing Cogeneration Luohuang Power Weihai Power Jinling Power Yueyang Power Shidongkou Power Yangliuqing Cogeneration Shandong Power Other individually immaterial subsidiaries Total NCI percentage 40% 59% 40% 40% 40% 45% 50% 45% 20% 31 December 2017 Non-current assets 10,553,775 6,841,918 4,055,507 4,664,868 5,049,079 4,875,004 3,712,623 2,541,803 47,665,952 Current assets 1,738,000 1,257,485 887,225 633,012 494,312 987,812 494,073 497,441 6,891,086 Non-current liabilities (3,053,535 ) (394,590 ) (242,944 ) (81,048 ) (1,541,444 ) (1,042,093 ) (731,640 ) (205,205 ) (19,681,891 ) Current liabilities (5,821,543 ) (2,501,516 ) (2,064,897 ) (2,462,363 ) (1,854,441 ) (2,590,470 ) (1,919,701 ) (869,071 ) (18,695,005 ) Net assets 3,416,697 5,203,297 2,634,891 2,754,469 2,147,506 2,230,253 1,555,355 1,964,968 16,180,142 Carrying amount of NCI 1,380,594 3,050,283 1,032,938 1,101,787 859,024 1,019,016 777,678 883,340 4,697,283 5,171,095 19,973,038 Revenue 4,587,612 4,262,547 2,303,079 3,421,115 3,423,688 3,149,190 2,117,052 2,010,872 22,566,737 Net (loss)/profit (169,261 ) 541,602 (60,758 ) 324,335 269,949 47,224 164,557 121,853 (800,622 ) Total comprehensive (loss)/income (169,261 ) 541,602 (60,758 ) 324,335 269,949 47,224 164,557 121,853 (943,860 ) (Loss)/profit allocated to NCI (67,704 ) 319,545 (24,303 ) 129,734 107,980 21,251 82,278 54,834 (287,923 ) (331,321 ) 4,371 Other comprehensive (loss)/income allocated to NCI - - - - - - - - (28,648 ) 152 (28,496 ) Cash flow from operating activities 970,585 1,071,888 195,282 681,568 731,714 426,437 311,668 334,842 3,848,712 Cash flow from investment activities (252,441 ) (1,190,093 ) (383,004 ) (231,142 ) (47,518 ) (242,288 ) (93,434 ) (64,179 ) (3,967,060 ) Cash flow from financing activities (613,010 ) 70,299 156,483 (405,196 ) (680,226 ) (191,231 ) (384,317 ) (288,299 ) (282,625 ) Net increase/ (decrease) in cash and cash equivalents 105,134 (49,605 ) (31,239 ) 45,230 3,970 (7,082 ) (166,083 ) (17,586 ) (402,950 ) Dividends paid to NCI 150,000 532,966 - 160,000 179,023 65,675 133,700 71,103 220,321 Qinbei Power Beijing Cogeneration Luohuang Power Weihai Power Jinling Power Yueyang Power Shidongkou Power Yangliuqing Cogeneration Other individually immaterial subsidiaries Total NCI percentage 40% 59% 40% 40% 40% 45% 50% 45% 31 December 2016 Non-current assets 11,210,604 5,821,110 3,966,880 4,988,112 5,426,759 4,958,325 3,917,340 2,654,085 Current assets 1,472,192 1,041,957 864,069 508,493 649,446 826,089 380,641 563,023 Non-current liabilities (2,206,586 ) (152,911 ) (284,064 ) (104,952 ) (1,773,332 ) (1,150,021 ) (1,055,640 ) (224,373 ) Current liabilities (6,475,340 ) (1,665,750 ) (1,601,236 ) (2,504,410 ) (1,835,090 ) (1,828,581 ) (1,584,142 ) (991,614 ) Net assets 4,000,870 5,044,406 2,945,649 2,887,243 2,467,783 2,805,812 1,658,199 2,001,121 Carrying amount of NCI 1,614,264 2,928,015 1,157,242 1,154,897 987,135 1,260,591 829,099 899,609 5,352,890 16,183,742 Revenue 5,006,349 4,476,729 2,436,586 3,217,209 3,734,108 2,716,817 1,915,915 1,773,869 Net profit 457,311 788,899 122,508 507,900 655,568 243,913 297,211 177,447 Total comprehensive income 457,311 788,899 122,508 507,900 655,568 243,913 297,211 177,447 Profit allocated to NCI 182,924 465,450 49,003 203,160 262,227 109,761 148,606 79,851 326,578 1,827,560 Other comprehensive income allocated to NCI - - - - - - - - 484 484 Cash flow from operating activities 1,400,042 973,352 550,346 1,045,828 1,293,565 568,379 890,615 295,547 Cash flow from investment activities (312,604 ) (540,151 ) (189,599 ) (273,117 ) (37,274 ) (62,622 ) (258,892 ) (197,600 ) Cash flow from financing activities (1,247,836 ) (344,718 ) (319,643 ) (786,471 ) (1,255,955 ) (521,249 ) (462,075 ) (58,293 ) Net (decrease)/increase in cash and cash equivalents (160,398 ) 88,518 41,104 (13,760 ) 336 (15,492 ) 169,648 39,616 Dividends paid to NCI 433,090 687,679 120,000 366,983 308,923 - 273,900 128,857

Subsequent events

Subsequent events	12 Months Ended
	Dec. 31, 2017
Subsequent events [abstract]
Subsequent events	42 Subsequent events (a) After the end of the reporting period, the directors proposed a final dividend. Further details are disclosed in Note 23. (b) On 28 September 2017, Huaneng Group entered into a guarantee agreement with Industrial and Commercial Bank of China Limited ("ICBC"), to provide guarantee amounted USD100 million for short-term loans of Huaneng Shandong Ruyi (Pakistan) Energy (Private) Ltd., a subsidiary of "Ruyi (Hong Kong) Energy", which is a joint venture of Shandong Power. According to the "Proposal of Shandong Power's takeover of the guarantee agreement for short-term loans of the Sahiwal Project in Pakistan". Shandong Power is expected to issue the confirmation letter upon the approval from the general meeting of shareholders, which officially confirms with ICBC, Huaneng Group and Shandong Ruyi Technology Group Co., Ltd. that it will take over the obligation of Huaneng Group under the aforementioned guarantee agreement thereon. On January 30 2018, the first extraordinary general meeting of the Company approved the proposal. At the date on which financial statements were approved for issue, Shandong Power is in the process of takeover the guarantee agreement. Huaneng Group are still held responsible for the guarantee agreement before the confirmation letter is issued. (c) The Company issued super short-term bonds with face value of RMB4 billion bearing annual interest rate of 4.35% in February 2018. The bonds are denominated in RMB and mature in 90 days, with a par value of RMB100. The Company issued super short-term bonds with face value of RMB2 billion bearing annual interest rate of 4.35% in March 2018. The bonds are denominated in RMB and mature in 90 days, with a par value of RMB100. (d) On 5 February 2018, the Public Offering Review Committee of the China Securities Regulatory Commission reviewed the application of the Company for the non-public issuance of A Shares. According to the review results, the Company's application for non-public issuance of A Shares was approved.

Principal accounting policies (

Principal accounting policies (Policies)	12 Months Ended
	Dec. 31, 2017
Principal accounting policies [abstract]
Basis of preparation	(a) Basis of preparation These financial statements have been prepared in accordance with International Financial Reporting Standards ("IFRS") as issued by the International Accounting Standards Board (the "IASB"). These financial statements have been prepared under the historical cost convention, as modified by the revaluation of available-for-sale financial assets, financial assets at fair value through profit or loss and derivative financial assets and liabilities. The preparation of financial statements in conformity with IFRS requires the use of certain critical accounting estimates. It also requires management to exercise its judgment in the process of applying the Company and its subsidiaries' accounting policies. The areas involving a higher degree of judgment or complexity, or areas where assumptions and estimates are significant to the financial statements are disclosed in Note 4. As at 31 December 2017, the Company and its subsidiaries have net current liabilities of approximately RMB107.4 billion, and a portion of the Company and its subsidiaries' funding requirements for capital expenditures were satisfied by short-term financing. Taking into consideration of the expected operating cash flows of the Company and its subsidiaries and the undrawn available banking facilities of approximately RMB241.9 billion as at 31 December 2017, the Company and its subsidiaries are expected to refinance certain of its short-term loans and bonds and also to consider alternative sources of financing, where applicable and when needed. Therefore, the directors of the Company are of the opinion that the Company and its subsidiaries will be able to meet its liabilities as and when they fall due within the next twelve months and accordingly, these consolidated financial statements are prepared on a going concern basis. The IASB has issued several amendments to IFRSs that are first effective for the current accounting period of the Company and its subsidiaries. None of these developments have had a material effect on how the Company and its subsidiaries' results and financial position for the current or prior periods have been prepared or presented. However, additional disclosure has been included in Note 35 to satisfy the new disclosure requirements introduced by the amendments to IAS 7, Statement of cash flows: Disclosure initiative
Consolidation	(b) Consolidation The consolidated financial statements include the financial statements of the Company and all of its subsidiaries. Subsidiaries are investees over which the Company and its subsidiaries have the power to exercise control. The Company and its subsidiaries control an entity when it is exposed, or have rights to variable returns from their involvement with the entity and have the ability to affect those returns through their power over the entity. In assessing whether the Company and its subsidiaries have power, only substantive rights (held by the Company and its subsidiaries and other parties) are considered. Subsidiaries are consolidated from the date when control is transferred to the Company and its subsidiaries. They are de-consolidated from the date when control ceases. Intra-group balances, transactions and cash flows, and any unrealised income and expenses arising from intra-group transactions, are eliminated in full in preparing the consolidated financial statements. Unrealised gains arising from transactions with equity accounted investees are eliminated against the investment to the extent of the Company and its subsidiaries' interest in the investee. Unrealised losses are eliminated in the same way as unrealised gains, but only to the extent that there is no evidence of impairment. The portion of the shareholders' equity of the subsidiaries, which is not attributable directly or indirectly to the parent company, is separately presented as non-controlling interests in the shareholders' equity in the consolidated financial statements. When there is any inconsistency on the accounting policies or financial period adopted between subsidiaries and the Company, the financial statements of subsidiaries are adjusted according to the accounting policies or financial period adopted by the Company. (i) Business combinations The acquisition method is used to account for the business combinations of the Company and its subsidiaries (including business combinations under common controls). The consideration transferred for the acquisition of a subsidiary is the fair values of the assets transferred, the liabilities incurred to the former owners of the acquiree and the equity interests issued by the Company and its subsidiaries. Any contingent consideration is measured at fair value at the date of acquisition. If an obligation to pay contingent consideration that meets the definition of a financial instrument is classified as equity, then it is not remeasured and settlement is accounted for within equity. Otherwise, other contingent consideration is remeasured at fair value at each reporting date and subsequent changes in the fair value of the contingent consideration are recognised in profit or loss. Acquisition-related costs are expensed as incurred. Identifiable assets acquired and liabilities and contingent liabilities assumed in a business combination are measured initially at their fair values at the acquisition date. On an acquisition-by-acquisition basis, the Company and its subsidiaries recognize any non-controlling interests in the acquiree either at fair value or at the non-controlling interest's proportionate share of the recognized amounts of acquiree's identifiable net assets. The excess of the consideration transferred, the amount of any non-controlling interest in the acquiree and the acquisition-date fair value of any previous equity interest in the acquiree over the fair value of the identifiable net assets acquired is recorded as goodwill (Note 2(i)). If this consideration is lower than the fair value of the net assets of the subsidiary acquired, the difference is recognized in profit or loss. (ii) Changes in ownership interests in subsidiaries Transactions with non-controlling interests that do not result in loss of control are accounted for as equity transactions - that is, as transactions with the equity owners in their capacity as owners. The difference between fair value of any consideration paid and the relevant share acquired of the carrying value of net assets of the subsidiary is recorded in equity. Gains or losses on disposals to non-controlling interests are also recorded in equity. When the Company and its subsidiaries lose control of a subsidiary, it is accounted for as a disposal of the entire interest in that subsidiary, with a resulting gain or loss being recognized in profit or loss. Any interest retained in that former subsidiary at the date when control is lost is recognized at fair value and this amount is regarded as the fair value on initial recognition of a financial asset (Note 2(k)) or, when appropriate, the cost on initial recognition of an investment in an associate or joint venture (Note 2(b)(iii)). (iii) Associates and joint ventures Associates are investees over which the Company and its subsidiaries have significant influence on the financial and operating decisions. A joint venture is an arrangement whereby the Company and its subsidiaries and other parties contractually agree to share control of the arrangement, and have rights to the net assets of the arrangement. Investments in associates and joint ventures are initially recognized at cost and are subsequently measured using the equity method of accounting, unless it is classified as held for sale (or included in a disposal group that is classified as held for sale). The excess of the initial investment cost over the proportionate share of the fair value of identifiable net assets of investee acquired is included in the initial investment cost (Note 2(i)). Any shortfall of the initial investment cost to the proportionate share of the fair value of identifiable net assets of investee acquired is recognized in current period profit or loss and long-term investment cost is adjusted accordingly. When applying equity method, the Company and its subsidiaries adjust net profit or loss of the investees, including the fair value adjustments on the net identifiable assets of the associates and joint ventures and the adjustments to align with the accounting policies of the Company and the Company's financial reporting periods. Current period investment income is then recognized based on the proportionate share of the Company and its subsidiaries in the investees' net profit or loss. Net losses of investees are recognized to the extent of the carrying value of long-term equity investments and any other constituting long-term equity investments in investees that in substance form part of the investments in the investees. The Company and its subsidiaries continue to recognize investment losses and provision if they bear additional obligations which meet the recognition criteria. The Company and its subsidiaries adjust the carrying amount of the investment and directly recognize into related other comprehensive income based on their proportionate share on the movements of the investees' other comprehensive income. When the investees appropriate profit or declare dividends, the carrying value of long-term equity investments are reduced correspondingly by the proportionate share of the distribution. The Company and its subsidiaries determine at each reporting date whether there is any objective evidence that the investment in the associate or the joint venture is impaired. If this is the case, the Company and its subsidiaries calculate the amount of impairment as the difference between the recoverable amount of the associate or the joint venture and its carrying value and recognize the amount in the consolidated statement of comprehensive income. Profits or losses resulting from transactions between the Company and its subsidiaries and the associates and joint ventures are recognized in the Company and its subsidiaries' financial statements only to the extent of the unrelated third party investor's interests in the associates and joint ventures. Loss from transactions between the Company and its subsidiaries and the associates and joint ventures is fully recognized and not eliminated when there is evidence for asset impairment. If an investment in an associate becomes an investment in a joint venture or vice versa, retained interest is not remeasured. Instead, the investment continues to be accounted for under the equity method. Gains and losses arising from dilution of investments in associates and joint ventures are recognized in the consolidated statement of comprehensive income. In all other cases, when the Company and its subsidiaries cease to have significant influence over an associate or joint control over a joint venture, it is accounted for as a disposal of the entire interest in that investee, with a resulting gain or loss being recognized in profit or loss. Any interest retained in that former investee at the date when significant influence or joint control is lost is recognized at fair value and this amount is regarded as the fair value on initial recognition of a financial asset (Note 2(k)).
Segment reporting	(c) Segment reporting The Company and its subsidiaries determine the operating segment based on the internal organization structure, management requirement and internal reporting system for purposes of presenting reportable segment information. An operating segment represents a component of the Company and its subsidiaries that meets all the conditions below: (i) the component earns revenue and incurs expenses in its daily operating activities; (ii) chief operating decision maker of the Company and its subsidiaries regularly reviews the operating results of the component in order to make decisions on allocating resources and assessing performance; (iii) the financial position, operating results, cash flows and other related financial information of the component are available. When the two or more operating segments exhibit similar economic characteristics and meet certain conditions, the Company and its subsidiaries combine them as one reportable segment.
Foreign currency translation	(d) Foreign currency translation (i) Functional and presentation currency Items included in the financial statements of each of the Company and its subsidiaries are measured using the currency of the primary economic environment in which the entity operates (the "functional currency"). The consolidated financial statements are presented in Renminbi ("RMB"), which is the Company's functional and presentation currency. (ii) Transactions and balances Foreign currency transactions are translated into the functional currency using the spot exchange rate on the transaction dates. As at the end of reporting period, foreign currency monetary items are translated into functional currency at the spot exchange rate as at the end of reporting period. Exchange differences are directly expensed in current period profit or loss unless they arises from foreign currency loans borrowed for purchasing or construction of qualifying assets which is eligible for capitalization or they arise from monetary items that qualify as hedging instruments in cash flow hedges which are recorded in other comprehensive income to the extent that the hedge is effective. (iii) Foreign subsidiaries The operating results and financial position of the foreign subsidiaries are translated into presentation currency as follows: Asset and liability items in each statement of financial position of foreign operations are translated at the closing rates at the end of reporting period; equity items excluding retained earnings are translated at the spot exchange rates at the date of the transactions. Income and expense items in the statement of comprehensive income of the foreign operations are translated at average exchange rates approximating the rate on transaction dates. All resulting translation differences are recognized in other comprehensive income. The cash flows denominated in foreign currencies and cash flows of overseas subsidiaries are translated at average exchange rates approximating the rates at the dates when cash flows incurred. The effect of the foreign currency translation on the cash and cash equivalents is presented in the statement of cash flows separately. On the disposal of a foreign operation (that is, a disposal of the Company and its subsidiaries' entire interest in a foreign operation, or a disposal involving loss of control over a subsidiary that includes a foreign operation, a disposal involving loss of joint control over a joint ventures that includes a foreign operation, or a disposal involving loss of significant influence over an associate that includes a foreign operation), all of the exchange differences accumulated in equity in respect of that operation attributable to the equity holders of the Company are reclassified to profit or loss. In the case of a partial disposal that does not result in the Company and its subsidiaries losing control over a subsidiary that includes a foreign operation, the proportionate share of accumulated exchange differences are re-attributed to non-controlling interests and are not recognized in profit or loss. For all other partial disposals (that is, reductions in the Company and its subsidiaries' ownership interest in associates or joint venture that includes a foreign operation that do not result in the Company and its subsidiaries losing significant influence or joint control), the proportionate share of the accumulated exchange difference is reclassified to profit or loss.
Property, plant and equipment	( e ) Property, plant and equipment Property, plant and equipment consists of dam, port facilities, buildings, electric utility plant in service, transportation facilities, others and construction-in-progress ("CIP"). Property, plant and equipment acquired or constructed are initially recognized at cost and carried at the net value of cost less accumulated depreciation and accumulated impairment loss, unless classified as held for sale (or included in a disposal group that is classified as held for sale). Cost of CIP comprises construction expenditures, other expenditures necessary for the purpose of preparing the CIP for its intended use, those borrowing costs incurred before the assets are ready for intended use that are eligible for capitalization. CIP is not depreciated until such time as the relevant asset is completed and ready for its intended use. Subsequent costs about property, plant and equipment are included in the asset's carrying amount only when it is probable that future economic benefits associated with the item will flow to the Company and its subsidiaries and the cost of the item can be measured reliably. The carrying amount of the replaced part is derecognized. Other subsequent expenditures not qualified for capitalization are charged in the current period profit or loss when they are incurred. Depreciation of property, plant and equipment is provided based on book value of the asset less estimated residual value over the estimated useful life using straight-line method. For those impaired property, plant and equipment, depreciation is provided based on book value after deducting impairment provision over the estimated useful life of the asset. The estimated useful lives are as follows: Estimated useful lives Dam 8 - 50 years Port facilities 20 - 40 years Buildings 8 - 30 years Electric utility plant in service 5 - 30 years Transportation facilities 8 - 27 years Others 5 - 14 years Where parts of an item of property, plant and equipment have different useful lives, the cost of the item is allocated on a reasonable basis between the parts and each part is depreciated separately. At the end of each year, the Company and its subsidiaries review the estimated useful lives, residual values and the depreciation method of the property, plant and equipment and make adjustment when necessary. Property, plant and equipment is derecognized when it is disposed of, or is not expected to bring economic benefit through use or disposal. The amount of disposal proceeds arising from sale, transfer, disposal or write-off of the property, plant and equipment less book value and related tax expenses is recorded in 'operating expenses - others' in the statement of comprehensive income. The carrying amount of property, plant and equipment is written down immediately to its recoverable amount when its carrying amount is greater than its recoverable amount (Note 2(j)).
Investment property	( f ) Investment property Investment properties are land and/or buildings which are owned or held under a leasehold interest (Note 2(y)) to earn rental income and/or for capital appreciation. These include land held for a currently undetermined future use and property that is being constructed or developed for future use as investment property. Investment properties are stated at fair value, unless they are still in the course of construction or development at the end of the reporting period and their fair value cannot be reliably measured at that time. Any gain or loss arising from a change in fair value or from the retirement or disposal of an investment property is recognized in profit or loss. Rental income from investment properties is accounted for as described in Note 2(x)(vi).
Power generation license	( g ) Power generation license The Company and its subsidiaries acquired the power generation license as part of the business combination with Tuas Power Ltd. ("Tuas Power"). The power generation license is initially recognized at fair value at the acquisition date. The license has an indefinite useful life and is not amortized. The assessment that the license has an indefinite useful life is based on the expected renewal of power generation license without significant restriction and cost, together with the consideration on related future cash flows generated and the expectation of continuous operations. It is tested annually for impairment and carried at cost less accumulated impairment loss. Useful life of the power generation license is reviewed by the Company and its subsidiaries each financial period to determine whether events and circumstances continue to support the indefinite useful life assessment.
Mining rights	(h) Mining rights Mining rights are stated at cost less accumulated amortization and impairment losses (Note 2(j)) and are amortized based on the units of production method utilizing only recoverable coal reserves as the depletion base, unless the mining rights are classified as held for sale (or included in a disposal group that is classified as held for sale).
Goodwill	(i) Goodwill Goodwill arising from the acquisitions of subsidiaries, associates and joint ventures represents the excess of the consideration transferred, the amount of any non-controlling interest in the acquiree and the acquisition-date fair value of any previous equity interest in the acquiree over the Company and its subsidiaries' share of the net fair value of the net identifiable assets, liabilities and contingent liabilities of the acquiree at the date of acquisition. Goodwill is stated at cost less accumulated impairment losses. Goodwill arising on a business combination is allocated to each cash-generating unit, or groups of cash generating units, that is expected to benefit from the synergies of the combination and is tested annually for impairment (Note 2(j)). On disposal of a cash generating unit during the year, any attributable amount of purchased goodwill is included in the calculation of the profit or loss on disposal.
Impairment of non-financial assets	(j) Impairment of non-financial assets The carrying amounts of property, plant and equipment, mining rights, intangible assets with definite useful lives, land use rights and long-term equity investments not accounted for as financial assets are reviewed at each reporting date to determine whether there is any indication of impairment. If any such indication exists, then the asset's recoverable amount is estimated. Goodwill, indefinite-lived intangible assets and intangible assets not yet available for sale are tested for impairment annually regardless of whether there are indications of impairment or more frequently if events or changes in circumstances indicate a potential impairment. An impairment loss is recognized if the carrying amount of an asset or cash-generating unit ("CGU") exceeds its recoverable amount. The recoverable amount of an asset or CGU is the greater of its value in use and its fair value less cost to sell. For impairment testing, assets are grouped together into the smallest group of assets that generates cash inflows from continuing use that are largely independent of the cash inflows of other assets or CGUs. Subject to an operating segment ceiling test, CGUs to which goodwill has been allocated are aggregated so that the level at which impairment testing is performed reflects the lowest level at which goodwill is monitored for internal reporting purposes. Goodwill acquired in a business combination is allocated to groups of CGUs that are expected to benefit from the synergies of the combination. Impairment losses are recognized in profit or loss. Impairment losses recognized in respect of CGUs are allocated first to reduce the carrying amount of any goodwill allocated to the CGU (group of CGUs), and then to reduce the carrying amounts of the other assets in the CGU (group of CGUs) on a pro rata basis, except that the carrying value of an asset will not be reduced below its individual fair value less costs of disposal (if measurable) or value in use (if determinable). An impairment loss in respect of goodwill is not reversed. Except for goodwill, all impaired non-financial assets are subject to review for possible reversal of impairment at each reporting date. A reversal of an impairment loss is limited to the asset's carrying amount that would have been determined had no impairment loss been recognized in prior year. Reversals of impairment losses are credited to profit or loss in the year in which the reversals are recognized.
Financial instruments	(k) Financial instruments Financial assets are classified in the following categories at initial recognition: at fair value through profit or loss, loans and receivables and available-for-sale. The classification depends on the intention and ability of the Company and its subsidiaries to hold the financial assets. (i) Financial assets at fair value through profit or loss Financial assets at fair value through profit or loss include financial assets held for trading and designated upon initial recognition as at fair value through profit or loss, and contingent consideration of the acquirer in a business combination. A financial asset is classified in this category if acquired principally for the purpose of selling in the short term. Derivatives are classified as held for trading unless they are designated as hedges. Assets in this category are classified as current assets if expected to be settled within 12 months; otherwise, they are classified as non-current. (ii) Loans and receivables Loans and receivables refer to the non-derivative financial assets for which there is no quotation in the active market with fixed or determinable amount. They are included in current assets, except for maturities greater than 12 months after the end of reporting period which are classified as non-current assets. Loans and receivables are primarily included in as 'accounts receivable', 'other receivables and assets' and 'other non-current assets' in the statement of financial position. (iii) Available-for-sale financial assets Available-for-sale financial assets are non-derivative financial assets that are either designated in this category or not classified in any of the other categories. They are included in current assets when management intends to dispose of the available-for-sale financial assets within 12 months of the end of reporting period, otherwise, they are classified as non-current assets. (iv) Recognition and measurement Regular purchases and sales of financial assets are recognized at fair value initially on trade-date - the date on which the Company and its subsidiaries commit to purchase or sell the asset. Transaction costs relating to financial assets at fair value through profit or loss are directly expensed in the profit or loss as incurred. Transaction costs for other financial assets are included in the carrying amount of the asset at initial recognition. Financial assets are derecognized when the rights to receive cash flows from the financial assets have expired or have been transferred and all risks and rewards related to the ownership of the financial assets have been transferred to the transferee. Financial assets at fair value through profit or loss and available-for-sale are subsequently measured at fair value. When an active market exists for a financial instrument, fair value is determined based on quoted prices in the active market. When no active market exists, fair value is determined by using valuation techniques. When applying valuation techniques, the Company and its subsidiaries maximize the use of relevant observable inputs and minimize the use of unobservable inputs. Changes in the fair value of financial assets at fair value through profit or loss are recorded in 'gain/(loss) on fair value changes of financial assets/liabilities'. Investments in equity instruments that do not have a quoted market price in an active market and whose fair value cannot be reliably measured are measured at cost. Loans and receivables are carried at amortized cost using the effective interest method. Except for impairment loss and translation differences on monetary financial assets, changes in the fair value of available-for-sale financial assets are recognized in other comprehensive income. When these financial assets are derecognized, the accumulated fair value adjustments recognized in equity are included in the statement of comprehensive income as 'other investment income'. Dividends on available-for-sale financial assets are recorded in 'other investment income' when the right of the Company and its subsidiaries to receive payments is established. (v) Impairment of financial assets Except for financial assets at fair value through profit or loss, the Company and its subsidiaries perform assessment on the book value of financial assets at the end of reporting period. Provision for impairment is made when there is objective evidence showing that a financial asset is impaired. For investments in associates and joint ventures, the impairment loss is measured by comparing the recoverable amount of the investment with its carrying amount. The impairment loss is reversed if there has been a favourable change in the estimates used to determine the recoverable amount. In the case of equity investments classified as available for sale, a significant or prolonged decline in the fair value of the investment below its cost is evidence that the assets are impaired. If any such evidence exists for available-for-sale financial assets, the cumulative loss, measured as the difference between the acquisition cost and the current fair value, less any impairment loss on that financial asset previously recognized in profit or loss, is removed from equity and recognized in profit or loss. Impairment losses recognized in the profit or loss on equity instruments are not reversed through the profit or loss. When financial assets carried at amortized cost are impaired, the carrying amount of the financial assets is reduced to the present value of estimated future cash flows (excluding future credit losses that have not been incurred) discounted at the financial asset's original effective interest rate. The impaired amount is recognized as assets impairment loss in the current period. If there is objective evidence that the value of the financial assets has recovered as a result of objective changes in circumstances occurring after the impairment loss was originally recognized, the originally recognized impairment loss is reversed through profit or loss. For the impairment test of receivables, please refer to Note 2(l). (vi) Derivative financial instruments and hedging activities Derivatives are initially recognized at fair value on the date a derivative contract is entered into and are subsequently remeasured at their fair value. Gain or loss arising from subsequent change in the fair value of derivative financial instruments is recognized in profit or loss except for the effective portions of gain or loss on the derivative financial instruments designated as cash flow hedges which are recognized directly in other comprehensive income. Cash flow hedge represents a hedge against the exposure to variability in cash flows, which such cash flow is originated from a particular risk associated with highly probable forecast transactions and variable rate borrowings and which could affect the statement of comprehensive income. The hedged items of cash flow hedge are the designated items with respect to the risks associated with future cash flow change resulting from variability in cash flows of a recognized asset or liability or a highly probable forecast transaction or the foreign currency risk of a committed future transaction. Hedging instruments are designated derivative for cash flow hedge whose cash flows are expected to offset changes in the cash flows of a hedged item. The full fair value of a hedging derivative is classified as a non-current asset or liability when the remaining maturity of the hedge item is more than 12 months. The Company and its subsidiaries document their assessments, both at hedge inception and on an ongoing basis, of whether the derivatives that are used in hedging transactions are highly effective in offsetting changes in cash flows of hedged items. The Company and its subsidiaries apply ratio analysis method to evaluate the ongoing effectiveness of the cash flow hedge. The effective portion of changes in the fair value of derivatives that are designated and qualify as cash flow hedges are recognized in other comprehensive income. The gain or loss relating to the ineffective portion is recognized immediately in the statement of comprehensive income within 'gain/(loss) on fair value changes of financial assets/liabilities'. Amounts accumulated in equity are reclassified to the profit or loss in the periods when the hedged item affects profit or loss. The gain or loss relating to the effective portion of interest rate swaps hedging variable rate borrowings is recognized in the statement of comprehensive income within 'interest expense'. The gain or loss relating to the effective portion of exchange forward hedging foreign currency denominated payables is recognized in the statement of comprehensive income within 'exchange gain/(loss) and bank charges, net'. However, when the forecast transaction that is hedged results in the recognition of a non-financial asset, the gains and losses previously deferred in equity are transferred from equity and included in the initial measurement of the cost of the asset. In the case where the Company and its subsidiaries expect all or a portion of net loss previously recognized directly in other comprehensive income will not be recovered in future financial periods, the irrecoverable portion will be reclassified into profit or loss. When a hedging instrument expires or is sold, terminated or exercised or when a hedge no longer meets the criteria for hedge accounting, the Company and its subsidiaries will discontinue hedge accounting. Any cumulative gain or loss existing in equity at that time remains in equity and is subsequently recognized when the forecast transaction is ultimately recognized in the profit or loss. When a forecast transaction is no longer expected to occur, the cumulative gain or loss that was reported in equity is immediately transferred to the statement of comprehensive income within 'gain/(loss) on fair value changes of financial assets/liabilities'.
Loans and receivables	( l ) Loans and receivables Loans and receivables, which primarily include accounts receivable, other receivables and other non-current assets, are recognized initially at fair value. Loans and receivables are subsequently measured at amortized cost less provision for doubtful debts using the effective interest method. The Company and its subsidiaries establish an allowance for impairment that represents its estimate of incurred losses in respect of receivables. The main components of this allowance are a specific loss component that relates to individually significant exposures, and a collective loss component established for groups of similar assets in respect of losses that have been incurred but not yet identified. The collective loss allowance is determined based on historical data of payment statistics for similar financial assets. When there is objective evidence that the Company and its subsidiaries will not be able to collect all amounts due according to the original terms of the receivables, impairment test is performed and related provision for doubtful accounts is made based on the shortfall between carrying amounts and respective present value of estimated future cash flows. The carrying amounts of the receivables are reduced through the use of allowance accounts, and the amount of the provision is recognized in the statement of comprehensive income within 'operating expenses - others'. When a receivable is uncollectible, it is written off against the allowance account for the receivable. Subsequent recoveries of amounts previously written off are credited against 'operating expenses - others' in the statement of comprehensive income.
Inventories	( m ) Inventories Inventories include fuel for power generation, materials for repairs and maintenance and spare parts, and are stated at lower of cost and net realizable values. Inventories are initially recorded at cost and are charged to fuel costs or repairs and maintenance, respectively when used, or capitalized to property, plant and equipment when installed, as appropriate, using weighted average cost basis. Cost of inventories includes costs of purchase and transportation costs. When the forecast transaction that is hedged results in the recognition of the inventory, the gains and losses previously deferred in equity are transferred from equity and included in the initial measurement of the cost of the inventory. Provision for inventory obsolescence is determined by the excess of cost over net realizable value. Net realizable values are determined based on the estimated selling price less estimated conversion costs during power generation, selling expenses and related taxes in the ordinary course of business.
Related parties	( n ) Related parties Parties are considered to be related if one party has the ability, directly or indirectly, to control the other party or exercise significant influence over the other party in making financial and operating decisions. Parties are also considered to be related if they are subject to common control or jointly control of the same third party; one party is controlled or jointly controlled by a third party and the other party is an associate or a joint venture of the same third party.
Cash and cash equivalents	( o ) Cash and cash equivalents Cash and cash equivalents listed in the statement of cash flows represents cash in hand, call deposits held with banks and other financial institutions, and other short-term (3 months or less), highly-liquid investments that are readily convertible to known amounts of cash and are subject to an insignificant risk of changes in value. Bank overdrafts that are repayable on demand and form an integral part of the cash management are also included as a component of cash and cash equivalents for the purpose of the consolidated statement of cash flow.
Borrowings	( p ) Borrowings Borrowings are recognized initially at fair value less transaction costs and subsequently measured at amortized cost using the effective interest method. Borrowings are classified as current liabilities unless the Company and its subsidiaries have an unconditional right to defer settlement of the liability for at least 12 months after the end of reporting period.
Borrowing costs	( q ) Borrowing costs General and specific borrowing costs directly attributable to the acquisition, construction or production of qualifying assets, which are assets that necessarily take a substantial period of time to get ready for their intended use or sale, are added to the cost of those assets. The capitalization of borrowing costs as part of the cost of a qualifying asset commences when expenditure for the asset is being incurred, borrowing costs are being incurred and activities that are necessary to prepare the asset for its intended use or sale are in progress. Capitalization of borrowing costs is suspended or ceases when substantially all the activities necessary to prepare the qualifying asset for its intended use or sale are interrupted or complete. The amount of specific borrowing costs capitalized is net of the investment income on any temporary investment of the funds pending expenditure on the asset. All other borrowing costs are recognized in profit or loss in the period in which they are incurred.
Share Capital	( r ) Share Capital Ordinary shares are classified as equity. Incremental costs directly attributable to the issue of new shares are shown in equity as a deduction, net of tax, from the proceeds.
Perpetual corporate bond	( s ) Perpetual corporate bond Perpetual corporate bond is classified as equity if it is non-redeemable, or redeemable only at the Company's option, and any interests are discretionary. Interests on perpetual corporate bonds classified as equity are recognised as distributions within equity.
Payables	( t ) Payables Payables primarily include accounts payable and other liabilities, and are recognized initially at fair value and subsequently measured at amortized cost using the effective interest method.
Taxation	( u ) Taxation (i) Value-added tax ("VAT") The domestic power, heat and goods sales of the Company and its subsidiaries are subject to VAT. VAT payable is determined by applying 17% (13% or 11% on heat) on the taxable revenue after offsetting deductible input VAT of the period. The applicable tax rate of VAT in respect of the lease of tangible movable properties, transportation industry and other modern services industry are 17%, 11% and 6%, respectively. According to the relevant regulations of Ministry of Finance of PRC and State Administration of Taxation, the transformation from Business Tax to VAT launched nation-wide from 1 May 2016 and all business tax taxpayers in the construction industry, real estate industry, financial industry, living services were included. The applicable tax rate of VAT in respect of sectors including construction services, lease of immovables, sale of immovables and transfer of land use rights is 11%, and in respect of financial and living services is 6%. (ii) Goods and service tax ("GST") The power sales of the subsidiaries in Singapore are subject to goods and service tax of the country where they operate. GST payable is determined by applying 7% on the taxable revenue after offsetting deductible GST of the period. (iii) Current and deferred income tax The income tax expense for the period comprises current and deferred income tax. Income tax expense is recognized in profit or loss, except to the extent that it relates to items recognized in other comprehensive income or directly in equity. In this case, the tax is also recognized in other comprehensive income or directly in equity, respectively. Deferred income tax assets and liabilities are recognized based on the differences between tax bases of assets and liabilities and respective book values (temporary differences). For deductible tax losses or tax credit that can be brought forward in accordance with tax law requirements for deduction of taxable income in subsequent years, it is considered as temporary differences and related deferred income tax assets are recognized. No deferred income tax liability is recognized for temporary difference arising from initial recognition of goodwill. For those temporary differences arising from initial recognition of an asset or liability in a non-business combination transaction that affects neither accounting profit nor taxable profit (or deductible loss) at the time of the transaction, no deferred income tax asset and liability is recognized. The temporary differences relating to investments in subsidiaries to the extent that, in the case of taxable differences, the Company and its subsidiaries control the timing of the reversal and it is probable that the differences will not reverse in the foreseeable future, or in the case of deductible differences, unless it is probable that they will reverse in the future. The Company and its subsidiaries recognize deferred income tax assets to the extent that it is probable that taxable profit will be available to offset the deductible temporary difference, deductible tax loss and tax credit. At the end of reporting period, deferred income tax assets and liabilities are measured at the tax rates that are expected to apply to the period when the asset is realized or liability is settled. The carrying amount of a deferred tax asset is reviewed at the end of each reporting period and is reduced to the extent that it is no longer probable that sufficient taxable profits will be available to allow the related tax benefit to be utilised. Any such reduction is reversed to the extent that it becomes probable that sufficient taxable profits will be available. Deferred income tax assets and deferred income tax liabilities are offset when meeting all the conditions below: (1) The Company and its subsidiaries have the legal enforceable right to offset current income tax assets and current income tax liabilities; (2) Deferred income tax assets and deferred income tax liabilities are related to the income tax levied by the same tax authority of the Company and its subsidiaries.
Employee benefits	( v ) Employee benefits Employee benefits include all expenditures relating to the employees for their services. The Company and its subsidiaries recognize employee benefits as liabilities during the accounting period when employees render services and allocate to related cost of assets and expenses based on different beneficiaries. In connection with pension obligations, the Company and its subsidiaries operate various defined contribution plans in accordance with the local conditions and practices in the countries and provinces in which they operate. A defined contribution plan is a pension plan under which the Company and its subsidiaries pay fixed contributions into a separate publicly administered pension insurance plan on mandatory and voluntary bases. The Company and its subsidiaries have no legal or constructive obligations to pay further contributions if the fund does not hold sufficient assets to pay all employees the benefits relating to employee service in the current and prior periods. The contributions are recognized as employee benefit when incurred. Prepaid contributions are recognized as assets to the extent that a cash refund or a reduction in the future payment is available.
Government grants	( w ) Government grants Government grants are recognized when the Company and its subsidiaries fulfill the conditions attached to them and they are probable to be received. When government grants are received in the form of monetary assets, they are measured at the amount received or receivable. When the grant is in the form of non-monetary assets, it is measured at fair value. When fair value cannot be measured reliably, nominal amount is assigned. Asset-related government grant is recognized as deferred income and is amortized evenly in profit or loss over the useful lives of related assets. Income-related government grant that is used to compensate subsequent related expenses or losses of the Company and its subsidiaries are recognized as deferred income and recorded in the profit or loss when related expenses or losses incurred. When the grant is used to compensate expenses or losses that were already incurred, they are directly recognized in current period profit or loss.
Revenue and income recognition	( x ) Revenue and income recognition Revenue and income are recognized based the following methods: Revenue and income are recognized when it is probable that the economic benefits associated with the transaction will flow to the Company and its subsidiaries and the amount of the revenue and income can be measured reliably. (i) Electricity and heat sales revenue Electricity and heat sales revenue represents the fair value of the consideration received or receivable for electricity and heat sold in the ordinary course of the activities of the Company and its subsidiaries (net of VAT or GST). Revenue is earned and recognized upon transmission of electricity to the customers or the power grid controlled and owned by the respective regional or provincial grid companies. (ii) Goods sales revenue Goods sales revenue represents the fair value of the consideration received or receivable for the sale of the goods in the ordinary course of the activities of the Company and its subsidiaries. Goods sales revenue is recognized when the goods is delivered to the customers and there is no unfulfilled obligation that could affect the customer's acceptance of the goods. (iii) Service revenue Service revenue refers to amounts received from service of port loading, conveying and transportation. The Company and its subsidiaries recognize revenue when the relevant service is provided. (iv) Dividend income Dividend income from unlisted investments is recognized when the shareholder's right to receive payment is established. Dividend income from listed investments is recognized when the share price of the investment goes ex-dividend. (v) Interest income Interest income from deposits is recognized on a time proportion basis using effective interest method. Interest income from the finance lease is recognized on a basis that reflects a constant periodic rate of return on the net investment in the finance lease. (vi) Rental income from operating leases Rental income receivable under operating leases is recognized in profit or loss in equal instalments over the periods covered by the lease term, except where an alternative basis is more representative of the pattern of benefits to be derived from the use of the leased asset. Lease incentives granted are recognized in profit or loss as an integral part of the aggregate net lease payments receivable. Contingent rentals are recognized as income in the accounting period in which they are earned.
Leases	( y ) Leases Leases where all the risks and rewards incidental to ownership of the assets are in substance transferred to the lessees are classified as finance leases. All other leases are operating leases. (i) Operating leases Operating lease expenses are capitalized or expensed on a straight-line basis over the lease term. The cost of acquiring land held under an operating lease is amortized on a straight-line basis over the period of the lease term. (ii) Finance lease The Company and its subsidiaries recognize the aggregate of the minimum lease receipts and the initial direct costs on the lease inception date as the receivable. The difference between the aggregate of the minimum lease receipts and the initial direct costs and sum of their respective present values is recognized as unrealized finance income. The Company and its subsidiaries adopt the effective interest method to allocate such unrealized finance income over the lease term. At the end of reporting period, the Company and its subsidiaries present the net amount of finance lease receivable after deducting any unrealized finance income in non-current assets and current assets, respectively. Please refer to Note 2(k)(u) for impairment test on finance lease receivables. Where the Company and its subsidiaries acquire the use of assets under finance leases, the amounts representing the fair value of the leased asset, or, if lower, the present value of the minimum lease payments, of such assets are included in fixed assets and the corresponding liabilities, net of finance charges, are recorded as obligations under finance leases. Depreciation is provided at rates which write off the cost or valuation of the assets over the term of the relevant lease or, where it is likely the Company and its subsidiaries will obtain ownership of the asset, the life of the asset, as set out in Note 2(e). Impairment losses are accounted for in accordance with the accounting policy as set out in Note 2(j). Finance charges implicit in the lease payments are charged to profit or loss over the period of the leases so as to produce an approximately constant periodic rate of charge on the remaining balance of the obligations for each accounting period. Contingent rentals are charged to profit or loss in the accounting period in which they are incurred.
Purchase of electricity	( z ) Purchase of electricity The overseas subsidiary of the Company recognizes electricity purchase cost when it purchases the electricity and transmits to its customers.
Financial guarantee contracts	(a a ) Financial guarantee contracts The Company issues financial guarantee contracts that transfer significant insurance risk. Financial guarantee contracts are those contracts that require the issuer to make specified payments to reimburse the holders for losses they incur because specified debtors fail to make payments when due in accordance with the original or modified terms of debt instruments. Where the Company issues a financial guarantee, the fair value of the guarantee is initially recognized as deferred income within accounts payable and other liabilities. The fair value of financial guarantees issued at the time of issuance is determined by reference to fees charged in an arm's length transaction for similar services, when such information is obtainable, or is otherwise estimated by reference to interest rate differentials, by comparing the actual rates charged by lenders when the guarantee is made available with the estimated rates that lenders would have charged, had the guarantees not been available, where reliable estimates of such information can be made. Where consideration is received or receivable for the issuance of the guarantee, the consideration is recognized in accordance with the Company's policies applicable to that category of asset. Where no such consideration is received or receivable, an immediate expense is recognized in profit or loss on initial recognition of any deferred income. The amount of the guarantee initially recognized as deferred income is amortized in profit or loss over the term of the guarantee as income from financial guarantees issued. In addition, provisions are recognised if and when (i) it becomes probable that the holder of the guarantee will call upon the Company under the guarantee, and (ii) the amount of that claim on the Company is expected to exceed the amount currently carried in trade and other payables in respect of the guarantee, i.e. the amount initially recognised, less accumulated amortisation.
Dividend distribution	(a b ) Dividend distribution Dividend distribution to the shareholders of the Company and its subsidiaries is recognized as a liability in the period when the dividend is approved in the shareholders' meeting.
Contingencies	(a c ) Contingencies Contingent liabilities are not recognized in the financial statements. They are disclosed unless the possibility of an outflow of resources embodying economic benefits is remote. Contingent assets are not recognized in the financial statements but disclosed when an inflow of economic benefit is probable.
Standards and amendments to published standards that are not yet effective but relevant to the Company and its subsidiaries	(a d ) Standards and amendments to published standards that are not yet effective but relevant to the Company and its subsidiaries The following are standards or amendments to existing standards that have been published and are mandatory for the accounting periods beginning on or after 1 January 2018, but the Company and its subsidiaries have not early adopted: • IFRIC 22, "Foreign currency transactions and advance consideration" • IFRS 15, " Revenue from contracts with customers" • IFRS 9, " Financial instrument (2014) • IFRS 16, " Leases • Amendments to IAS 40, "Investment property: Transfers of investment property", • IFRIC 23, " Uncertainty over income tax treatments • Included in "Annual improvements to IFRSs 2014-2016 Cycle" Investments in Associates and Joint Ventures" The Company and its subsidiaries are in the process of making an assessment of what the impact of these amendments and new standards is expected to be in the period of initial application. While the assessment has been substantially completed for IFRS 9 and IFRS 15, the actual impacts upon the initial adoption of the standards may differ as the assessment completed to date is based on the information currently available to the Company and its subsidiaries, and further impacts may be identified before the standards are initially applied in the Company and its subsidiaries' interim financial report for the six months ending 30 June 2018. The Company and its subsidiaries may also change its accounting policy elections, including the transition options, until the standards are initially applied in that financial report. (i) IFRS 9, Financial instruments (2014) IFRS 9 will replace the current standard on accounting for financial instruments, IAS 39, Financial instruments: Recognition and measurement IFRS 9 is effective for annual periods beginning on or after 1 January 2018 on a retrospective basis. The Company and its subsidiaries plan to use the exemption from restating comparative information and will recognise any transition adjustments against the opening balance of equity at 1 January 2018. Expected impacts of the new requirements on the consolidated financial statements are as follows: • The Company and its subsidiaries have assessed that their financial assets currently measured at amortised cost and FVTPL will continue with their respective classification and measurements upon the adoption of IFRS 9; • With respect to the Company and its subsidiaries' financial assets currently classified as "available-for-sale", these are equity investments which the Company and its subsidiaries have the option to irrevocably designate as FVTOCI (without recycling) on transition to IFRS 9. The Company and its subsidiaries plan to elect this designation option for any of the investments held on 1 January 2018 and will recognise any fair value changes in respect of these investments in other comprehensive income as they arise. The Company and its subsidiaries are in the process of assessing the fair value of the available-for-sale financial assets currently measured at cost less impairment and will disclose the impact to the opening balance of the Company and its subsidiaries' equity as 1 January 2018 in interim financial report for the six months ending 30 June 2018. • The classification and measurement requirements for financial liabilities under IFRS 9 are largely unchanged from IAS 39, except that IFRS 9 requires the fair value change of a financial liability designated at FVTPL that is attributable to changes of that financial liability's credit risk to be recognised in other comprehensive income (without reclassification to profit or loss). The Company and its subsidiaries currently do not have any above mentioned financial liabilities designated at FVTPL and therefore this new requirement will not have any impact on the Company and its subsidiaries on adoption of IFRS 9. • The new impairment model in IFRS 9 replaces the "incurred loss" model in IAS 39 with an "expected credit loss" model. Under the expected credit loss model, it will no longer be necessary for a loss event to occur before an impairment loss is recognised. Instead, an entity is required to recognise and measure either a 12-month expected credit loss or a lifetime expected credit loss, depending on the asset and the facts and circumstances. The Company and its subsidiaries expect that the application of the expected credit loss model will result in earlier recognition of credit losses. Based on a preliminary assessment, the Company and its subsidiaries do not expect material change to the loss allowance for the Company and its subsidiaries' trade debtors and other debt investment held at amortised cost and net investment in finance lease. • IFRS 9 does not fundamentally change the requirements relating to measuring and recognising ineffectiveness under IAS 39. However, greater flexibility has been introduced to the types of transactions eligible for hedge accounting. The Company and its subsidiaries have assessed that its current hedge relationships will qualify as continuing hedges upon the adoption of IFRS 9 and therefore it expects that the accounting for its hedging relationships will not be significantly impacted. (ii) IFRS 15, Revenue from contracts with customers IFRS 15 establishes a comprehensive framework for recognising revenue from contracts with customers. IFRS 15 will replace the existing revenue standards, IAS 18, Revenue Construction contracts During 2017, the Company substantially completed its assessment of the potential impact of the new standard, including performing a review of revenue streams and customer contracts in order to evaluate the effects that this standard may have on the consolidated statement of comprehensive income and consolidated statement of financial position. The Company and its subsidiaries' revenues are substantially generated from the sales of power heat and other goods. Effective 1 January 2018, the Company and its subsidiaries adopted IFRS 15 utilising the cumulative effect method, which results in the Company and its subsidiaries' retaining prior period comparative figures as reported under the previous standards and recognising the cumulative effect of applying IFRS 15 as an adjustment to the opening balance of retained earnings as at the date of initial adoption, and will provide additional disclosures comparing results to previous IFRS in its 2018 consolidated financial statements. The Company and its subsidiaries plan to apply the new revenue standard only to contracts not completed as of the date of initial application, referred to as open contracts. Since the number of open contracts at 31 December is limited, and more than 95% of the Company and its subsidiaries' revenue comprised of contracts with customers from rate-regulated sales of power and heat, where revenue will continue to be recognised upon transmission to the customers, the Company and its subsidiaries expects that the adoption of IFRS 15 will not have material impact on the consolidated financial statements. (iii) IFRS 16, Lease As disclosed in Note 2(y), currently the Company and its subsidiaries classify leases into finance leases and operating leases and account for the lease arrangements differently, depending on the classification of the lease. The Company and its subsidiaries enter into some leases as the lessor and others as the lessee. IFRS 16 is not expected to impact significantly on the way that lessors account for their rights and obligations under a lease. However, once IFRS 16 is adopted, lessees will no longer distinguish between finance leases and operating leases. Instead, subject to practical expedients, lessees will account for all leases in a similar way to current finance lease accounting, i.e. at the commencement date of the lease the lessee will recognise and measure a lease liability at the present value of the minimum future lease payments and will recognise a corresponding "right-of-use" asset. After initial recognition of this asset and liability, the lessee will recognise interest expense accrued on the outstanding balance of the lease liability, and the depreciation of the right-of-use asset, instead of the current policy of recognising rental expenses incurred under operating leases on a systematic basis over the lease term. As a practical expedient, the lessee can elect not to apply this accounting model to short-term leases (i.e. where the lease term is 12 months or less) and to leases of low-value assets, in which case the rental expenses would continue to be recognised on a systematic basis over the lease term. IFRS 16 will primarily affect the Company and its subsidiaries' accounting as a lessee of leases for properties, plant and equipment which are currently classified as operating leases. The application of the new accounting model is expected to lead to an increase in both assets and liabilities and to impact on the timing of the expense recognition in the statement of profit or loss over the period of the lease. As disclosed in Note 39(b), at 31 December 2017 the Company and its subsidiaries' future minimum lease payments under non-cancellable operating leases amount to RMB1,487 million for property, plant and equipment and land use rights, the majority of which is payable either between 1 and 5 years after the reporting date or in more than 5 years. Some of these amounts may therefore need to be recognised as lease liabilities, with corresponding right-of-use assets, once IFRS 16 is adopted. The Company and its subsidiaries will need to perform a more detailed analysis to determine the amounts of new assets and liabilities arising from operating lease commitments on adoption of IFRS 16, after taking into account the applicability of the practical expedient and adjusting for any leases entered into or terminated between now and the adoption of IFRS 16 and the effects of discounting. There are no other amendments and new standards that are not yet effective that would be expected to have a material impact on the Company and its subsidiaries' consolidated financial statements.

Principal accounting policies49

Principal accounting policies (Tables)	12 Months Ended
	Dec. 31, 2017
Principal accounting policies [abstract]
Estimated useful lives of property plant and equipment	Estimated useful lives Dam 8 - 50 years Port facilities 20 - 40 years Buildings 8 - 30 years Electric utility plant in service 5 - 30 years Transportation facilities 8 - 27 years Others 5 - 14 years

Financial and capital risks m50

Financial and capital risks management (Tables)	12 Months Ended
	Dec. 31, 2017
Financial and capital risks management [abstract]
Assets and liabilities measured at fair value	The following table presents the assets and liabilities that are measured at fair value at 31 December 2017. Level 1 Level 2 Level 3 Total Assets Financial assets at fair value through profit or loss - Trading derivatives (Note 14) - 2,726 - 2,726 - - - 859,547 859,547 Derivatives used for hedging (Note 14) - 330,966 - 330,966 Available-for-sale financial assets - Equity securities (Note 10) 9,223 - - 9,223 Total assets 9,223 333,692 859,547 1,202,462 Liabilities Financial liabilities at fair value through profit or loss - Trading derivatives (Note 14) - 125 - 125 Derivatives used for hedging (Note 14) - 210,539 - 210,539 Total liabilities - 210,664 - 210,664 The following table presents the assets and liabilities that are measured at fair value at 31 December 2016. Level 1 Level 2 Level 3 Total Assets Financial assets at fair value through profit or loss - Trading derivatives (Note 14) - 5,881 - 5,881 Derivatives used for hedging (Note 14) - 372,442 - 372,442 Available-for-sale financial assets - Equity securities (Note 10) 1,820,713 - - 1,820,713 Total assets 1,820,713 378,323 - 2,199,036 Liabilities Financial liabilities at fair value through profit or loss - Trading derivatives (Note 14) - 619 - 619 Derivatives used for hedging (Note 14) - 334,119 - 334,119 Total liabilities - 334,738 - 334,738
Movements during the period in the balance of the Level 3 fair value measurements	2017 Contingent consideration Beginning of the year - Movement: Gains on fair value changes 859,547 End of the year 859,547 Total gains for the period included in profit or loss for assets held at the end of the reporting period 859,547

Revenue and segment informati51

Revenue and segment information (Tables)	12 Months Ended
	Dec. 31, 2017
Revenue and segment information [abstract]
Revenues recognized during the year	For the year ended 31 December 2017 2016 2015 Sales of power and heat 148,925,442 112,794,536 127,849,408 Sales of coal 1,143,299 2,909 6,839 Port service 232,360 237,347 211,685 Transportation service 73,830 105,505 104,721 Others 2,084,513 673,939 732,220 Total 152,459,444 113,814,236 128,904,873
Revenue information under PRC GAAP	(Under PRC GAAP) PRC power segment Singapore segment All other segments Total For the year ended 31 December 2017 Total revenue 142,067,629 10,078,031 694,405 152,840,065 Inter-segment revenue - - (380,621 ) (380,621 ) Revenue from external customers 142,067,629 10,078,031 313,784 152,459,444 Segment results 2,417,073 (577,458 ) 302,191 2,141,806 Interest income 126,927 70,756 1,223 198,906 Interest expense (9,026,064 ) (450,928 ) (145,112 ) (9,622,104 ) Impairment loss (1,167,751 ) (994 ) (19,742 ) (1,188,487 ) Depreciation and amortization (18,081,299 ) (856,979 ) (189,764 ) (19,128,042 ) Net loss on disposal of non-current assets (580,345 ) (995 ) (3 ) (581,343 ) Share of profits less losses of associates and joint ventures (7,318 ) - 307,923 300,605 Income tax expense (1,667,234 ) 99,150 (5,386 ) (1,573,470 ) (Under PRC GAAP) PRC power segment Singapore segment All other segments Total For the year ended 31 December 2016 (Restated*) Total revenue 129,101,375 8,758,822 634,965 138,495,162 Inter-segment revenue - - (344,866 ) (344,866 ) Revenue from external customers 129,101,375 8,758,822 290,099 138,150,296 Segment results 17,633,734 (282,703 ) (38,433 ) 17,312,598 Interest income 102,265 69,672 623 172,560 Interest expense (7,952,640 ) (481,263 ) (137,825 ) (8,571,728 ) Impairment (loss)/reversal (1,410,733 ) 899 (8,475 ) (1,418,309 ) Depreciation and amortization (17,320,753 ) (778,426 ) (203,493 ) (18,302,672 ) Net loss on disposal of non-current assets (693,091 ) (172 ) (14,303 ) (707,566 ) Share of profits less losses of associates and joint ventures 973,982 - 73,415 1,047,397 Income tax expense (4,610,591 ) 44,135 57,489 (4,508,967 ) For the year ended 31 December 2015 (Restated*) Total revenue 143,679,910 10,143,793 588,266 154,411,969 Inter-segment revenue - - (266,701 ) (266,701 ) Revenue from external customers 143,679,910 10,143,793 321,565 154,145,268 Segment results 27,473,279 (313,253 ) (232,956 ) 26,927,070 Interest income 115,378 66,898 501 182,777 Interest expense (9,526,290 ) (452,034 ) (163,325 ) (10,141,649 ) Impairment (loss)/reversal (3,112,370 ) 1,744 (178,131 ) (3,288,757 ) Depreciation and amortization (16,719,037 ) (772,003 ) (245,936 ) (17,736,976 ) Net (loss)/gain on disposal of non-current assets (517,820 ) 22,450 (1 ) (495,371 ) Share of profits less losses of associates and joint ventures 1,247,293 - 18,247 1,265,540 Income tax expense (7,121,207 ) 254,772 14,397 (6,852,038 )
Assets and liabilities information under PRC GAAP	(Under PRC GAAP) PRC power segment Singapore segment All other segments Total 31 December 2017 Segment assets 334,379,104 27,817,680 9,978,885 372,175,669 Including: Additions to non-current assets (excluding financial assets and deferred income tax assets) 24,447,658 260,240 328,061 25,035,959 Investments in associates 12,577,836 - 2,919,860 15,497,696 Investments in joint ventures 1,457,247 - 1,025,534 2,482,781 Segment liabilities (264,115,887 ) (14,000,442 ) (3,026,229 ) (281,142,558 ) 31 December 2016 (Restated*) Segment assets 331,939,958 28,141,718 11,789,504 371,871,180 Including: Additions to non-current assets (excluding financial assets and deferred income tax assets) 27,430,205 230,974 854,484 28,515,663 Investments in associates 12,527,711 - 2,880,368 15,408,079 Investments in joint ventures 2,202,002 - 790,610 2,992,612 Segment liabilities (246,200,555 ) (14,027,606 ) (5,620,515 ) (265,848,676 )
Reconciliation of revenue from external customers to operating revenue	For the year ended 31 December 2017 2016(Restated*) 2015(Restated*) Revenue from external customers (PRC GAAP) 152,459,444 138,150,296 154,145,268 Reconciling item: Impact of restatement under PRC GAAP in relation to business combination under common control*(Note 40) - (24,336,060 ) (25,240,395 ) Operating revenue per IFRS consolidated statement of comprehensive income 152,459,444 113,814,236 128,904,873
Reconciliation of segment result to profit before income tax expense	For the year ended 31 December 2017 2016(Restated*) 2015(Restated*) Segment results (PRC GAAP) 2,141,806 17,312,598 26,927,070 Reconciling items: Loss related to the headquarter (170,210 ) (699,054 ) (327,262 ) Investment income from China Huaneng Finance Co., Ltd. ("Huaneng Finance") 143,794 132,018 135,971 Dividend income of available-for-sale financial assets 124,918 105,337 99,071 Gains on disposal of available-for-sale financial asset 1,479,732 932,738 4,282 Impact of restatement under PRC GAAP in relation to business combination under common control*(Note 40) - (3,417,300 ) (3,454,005 ) Impact of other IFRS adjustments** (918,307 ) (553,199 ) (427,077 ) Profit before income tax expense per IFRS consolidated statement of comprehensive income 2,801,733 13,813,138 22,958,050
Reportable segments' assets reconciled to total assets	As at 31 December 2017 2016(Restated*) Total segment assets (PRC GAAP) 372,175,669 371,871,180 Reconciling items: Investment in Huaneng Finance 1,336,777 1,314,603 Deferred income tax assets 2,980,303 2,447,648 Prepaid income tax 150,838 204,182 Available-for-sale financial assets 1,654,993 3,560,928 Corporate assets 395,148 360,854 Impact of restatement under PRC GAAP in relation to business combination under common control * (Note 40) - (70,341,769 ) Impact of other IFRS adjustments** 17,895,783 5,422,113 Total assets per IFRS consolidated statement of financial position 396,589,511 314,839,739
Reportable segments' liabilities reconciled to total liabilities	As at 31 December 2017 2016(Restated*) Total segment liabilities (PRC GAAP) (281,142,558 ) (265,848,676 ) Reconciling items: Current income tax liabilities (430,703 ) (572,515 ) Deferred income tax liabilities (1,283,950 ) (1,429,859 ) Corporate liabilities (3,632,847 ) (4,717,617 ) Impact of restatement under PRC GAAP in relation to business combination under common control * (Note 40) - 59,917,072 Impact of other IFRS adjustments** (2,484,849 ) (1,407 ) Total liabilities per IFRS consolidated statement of financial position (288,974,907 ) (212,653,002 )
Other material items	Reportable segment total Headquarters Investment income from Huaneng Finance Impact of restatement under PRC GAAP in relation to business combination under common control Impact of other IFRS adjustments** Total For the year ended 31 December 2017 Total revenue 152,459,444 - - - - 152,459,444 Interest expense (9,622,104 ) (126,900 ) - - - (9,749,004 ) Depreciation and amortization (19,128,042 ) (38,819 ) - - (1,468,972 ) (20,635,833 ) Impairment loss (1,188,487 ) - - - 1,275 (1,187,212 ) Share of profits less losses of associates and joint ventures 300,605 - 143,794 - (19,184 ) 425,215 Net (loss)/gain on disposal of non-current assets (581,343 ) 3,174 - - (38,287 ) (616,456 ) Income tax expense (1,573,470 ) - - - 355,944 (1,217,526 ) For the year ended 31 December 2016 (Restated*) Total revenue 138,150,296 - - (24,336,060 ) - 113,814,236 Interest expense (8,571,728 ) (131,244 ) - 1,885,446 - (6,817,526 ) Depreciation and amortization (18,302,672 ) (48,934 ) - 3,533,820 (344,929 ) (15,162,715 ) Impairment loss (1,418,309 ) - - 213,351 - (1,204,958 ) Share of profits less losses of associates and joint ventures 1,047,397 - 132,018 133,694 (14,220 ) 1,298,889 Net loss on disposal of non-current assets (707,566 ) (14 ) - 115,769 1,762 (590,049 ) Income tax expense (4,508,967 ) - - 928,854 114,962 (3,465,151 ) For the year ended 31 December 2015 (Restated*) Total Revenue 154,145,268 - - (25,240,395 ) - 128,904,873 Interest expense (10,141,649 ) (149,259 ) - 2,345,174 - (7,945,734 ) Depreciation and amortization (17,736,976 ) (60,236 ) - 3,474,072 (394,473 ) (14,717,613 ) Impairment loss (3,288,757 ) - - 198,604 - (3,090,153 ) Share of profits less losses of associates and joint ventures 1,265,540 - 135,971 180,447 (55,983 ) 1,525,975 Net loss on disposal of non-current assets (495,371 ) (6 ) - 90,534 (33,478 ) (438,321 ) Income tax expense (6,852,038 ) - - 1,016,588 136,507 (5,698,943 )
Countries that external revenue generated from	For the year ended 31 December 2017 2016 2015 PRC 142,381,413 105,055,414 118,761,080 Singapore 10,078,031 8,758,822 10,143,793 Total 152,459,444 113,814,236 128,904,873
Countries that non-current assets (excluding financial assets and deferred income tax assets) located	As at 31 December 2017 2016 PRC 319,534,533 249,155,921 Singapore 23,035,758 23,369,766 Total 342,570,291 272,525,687
Information on sales to major customers	For the year ended 31 December 2017 2016 2015 Amount Proportion Amount Proportion Amount Proportion State Grid Shandong Electric Power Company 28,659,891 19 % 12,649,224 11 % 14,855,655 12 %

Profit before income tax expe52

Profit before income tax expense (Tables)	12 Months Ended
	Dec. 31, 2017
Profit before income tax expense [abstract]
Profit before income tax expense	For the year ended 31 December 2017 2016 2015 Total interest expense on borrowing 10,225,069 7,267,490 8,716,074 Less: amounts capitalized in property, plant and equipment 476,065 449,964 770,340 Interest expenses charged in consolidated statement of comprehensive income 9,749,004 6,817,526 7,945,734 Auditors' remuneration-audit services 64,160 43,610 41,640 Operating leases charge 364,756 331,496 313,723 Fuel 92,737,304 56,617,542 59,242,367 Depreciation of property, plant and equipment 20,180,830 14,815,620 14,411,632 Amortization of land use rights 341,125 225,707 213,206 Amortization of other non-current assets 113,878 121,388 92,775 Impairment loss of property, plant and equipment (Note 7) 1,046,195 1,063,735 1,047,641 Impairment loss of land use rights (Note 11) 108,590 51,981 - Impairment loss of investment in an associate - - 178,131 Impairment loss of mining rights - - 760,296 Impairment loss of goodwill - - 1,105,649 Impairment loss of other non-current assets 5,008 - - Recognition/(reversal) of provision for doubtful accounts 27,682 89,498 (3,392 ) (Reversal)/recognition of provision for inventory obsolescence (263 ) (256 ) 1,828 Net loss on disposals of non-current assets 616,456 590,049 438,321 Government grants (421,912 ) (396,467 ) (696,735 ) Gain on a bargain purchase - (129,921 ) - Included in other investment income -Gains on disposal of available-for-sale financial asset (Note 10) (1,479,732 ) (932,738 ) - -Dividends on available-for-sale financial assets (124,918 ) (103,037 ) (97,696 ) -Gains on disposal of subsidiaries* (52,330 ) - - Included in (gain)/loss on fair value changes of financial assets/liabilities -Contingent consideration of the business combination (Note 40) (859,547 ) - - -Loss on fair value changes of trading derivatives 2,761 12,986 16,762

Property, plant and equipment (

Property, plant and equipment (Tables)	12 Months Ended
	Dec. 31, 2017
Property, plant and equipment [abstract]
Detailed information about property, plant and equipment	Dam Port facilities Buildings Electric utility plant in service Transport-ation facilities Others CIP Total As at 1 January 2016 Cost 1,856,144 3,860,009 8,306,471 327,827,738 980,290 5,809,400 23,851,697 372,491,749 Accumulated depreciation (153,325 ) (436,215 ) (2,508,772 ) (138,852,591 ) (371,226 ) (3,366,838 ) - (145,688,967 ) Accumulated impairment loss (268,981 ) - (68,931 ) (5,968,962 ) - (81,328 ) (741,510 ) (7,129,712 ) Net book value 1,433,838 3,423,794 5,728,768 183,006,185 609,064 2,361,234 23,110,187 219,673,070 Year ended 31 December 2016 Beginning of the year 1,433,838 3,423,794 5,728,768 183,006,185 609,064 2,361,234 23,110,187 219,673,070 Reclassification - 1,771 (492,558 ) 495,841 759 (5,813 ) - - Business combination - - 8,098 303,854 - 2,977 4,576 319,505 Additions - 1,770 127 418,812 - 122,519 18,839,102 19,382,330 Transfer from CIP 20,170 246,712 1,319,019 12,576,736 20,033 296,648 (14,479,318 ) - Disposals/write-off - - (68,945 ) (495,251 ) (26,477 ) (27,055 ) (193,357 ) (811,085 ) Depreciation charge (32,987 ) (113,810 ) (255,882 ) (14,004,881 ) (48,720 ) (387,884 ) - (14,844,164 ) Impairment charge (41,423 ) - (2,303 ) (1,005,367 ) - (6,399 ) (8,243 ) (1,063,735 ) Currency translation differences - - - 404,948 - 782 158 405,888 End of the year 1,379,598 3,560,237 6,236,324 181,700,877 554,659 2,357,009 27,273,105 223,061,809 As at 31 December 2016 Cost 1,876,314 4,116,914 9,056,858 341,195,395 875,630 6,041,783 28,022,858 391,185,752 Accumulated depreciation (186,312 ) (556,677 ) (2,749,300 ) (152,408,524 ) (320,971 ) (3,596,546 ) - (159,818,330 ) Accumulated impairment loss (310,404 ) - (71,234 ) (7,085,994 ) - (88,228 ) (749,753 ) (8,305,613 ) Net book value 1,379,598 3,560,237 6,236,324 181,700,877 554,659 2,357,009 27,273,105 223,061,809 Year ended 31 December 2017 Beginning of the year 1,379,598 3,560,237 6,236,324 181,700,877 554,659 2,357,009 27,273,105 223,061,809 Reclassification 49,386 (404 ) 52,047 (157,759 ) (4,357 ) 61,087 - - Business combination (Note 40) 279,169 - 1,944,531 58,379,270 17,243 443,052 2,717,544 63,780,809 Additions - - 184 840,991 - 88,160 21,225,980 22,155,315 Transfer from CIP 15,355 114,688 342,285 20,283,508 288,554 145,705 (21,190,095 ) - Disposals/write-off - (14,731 ) (30,837 ) (1,252,829 ) (3,907 ) (28,562 ) - (1,330,866 ) Disposal of subsidiaries - (632,709 ) (101,169 ) (114,542 ) - (153,096 ) (1,242,210 ) (2,243,726 ) Depreciation charge (40,200 ) (111,529 ) (339,630 ) (19,155,852 ) (59,022 ) (494,932 ) - (20,201,165 ) Impairment charge (45,619 ) - (1,651 ) (754,753 ) - (2,503 ) (241,669 ) (1,046,195 ) Currency translation differences - - - 151,249 - 263 600 152,112 End of the year 1,637,689 2,915,552 8,102,084 239,920,160 793,170 2,416,183 28,543,255 284,328,093 As at 31 December 2017 Cost 2,220,224 3,358,811 11,173,669 418,360,698 1,155,392 5,972,688 29,534,677 471,776,159 Accumulated depreciation (226,512 ) (443,259 ) (3,019,198 ) (170,525,898 ) (362,222 ) (3,523,292 ) - (178,100,381 ) Accumulated impairment loss (356,023 ) - (52,387 ) (7,914,640 ) - (33,213 ) (991,422 ) (9,347,685 ) Net book value 1,637,689 2,915,552 8,102,084 239,920,160 793,170 2,416,183 28,543,255 284,328,093

Investments in associates and54

Investments in associates and joint ventures (Tables)	12 Months Ended
	Dec. 31, 2017
Investments in associates and joint ventures [abstract]
Summary of investments in associates and joint ventures	2017 2016 Beginning of the year 19,632,113 19,745,192 Capital injections in associates and joint ventures 301,916 276,118 Business combination (Note 40(a)) 1,021,566 - Transfer from available-for-sale 91,800 - Transfer to subsidiaries (736,725 ) - Share of net profit less loss 425,215 1,298,889 Share of other comprehensive income/(loss) 121,208 (180,572 ) Currency translation differences (142,226 ) - Dividends (835,279 ) (1,507,514 ) Elimination of unrealized profits on transactions with equity-method investees (361,965 ) - End of the year 19,517,623 19,632,113
Basic information of material associates and joint ventures	Name Country of incorporation Registered capital Business nature and scope of operation Percentage of equity interest held Direct Indirect 1 Associates: SECL* PRC RMB2,642,994,398 Energy and investment in related industries 25.02% - Hebei Hanfeng Power Generation Limited Liability Company ("Hanfeng Power") PRC RMB1,975,000,000 Power generation 40% - Huaneng Finance PRC RMB5,000,000,000 Provision for financial service including fund deposit services, lending, finance lease arrangements, notes discounting and entrusted loans and investment arrangement within Huaneng Group 20% - Huaneng Sichuan Hydropower Co., Ltd. ("Sichuan Hydropower") PRC RMB1,469,800,000 Development, investment, construction, operation and management of hydropower 49% - China Huaneng Group Fuel Co., Ltd. ("Huaneng Group Fuel Company") ** PRC RMB3,000,000,000 Wholesale of coal, import and export of coal 50% - Hainan Nuclear Power Limited Liability Company("Hainan Nuclear") PRC RMB4,831,460,000 Construction and operation of nuclear power plants; production and sales of electricity and related products 30% - Joint ventures: Shanghai Time Shipping Co., Ltd. ("Shanghai Time Shipping") PRC RMB1,200,000,000 International and domestic sea transportation 50% - Jiangsu Nantong Power Generation Co., Ltd.("Jiangsu Nantong Power") PRC RMB1,596,000,000 Operation and Management of power generation plants and transportation related projects - 35% Huaneng Shandong Ruyi (Hongkong) Energy Co., Ltd ("Ruyi (Hongkong) Energy")*** Hong Kong 10,000 Shares Investment in electricity and other related energy projects - 40% Shandong Luyi Power International Limited Company ("Luyi Power")*** PRC RMB35,000,000 Contracting overseas projects and international bidding projects, mechanical and electrical equipment installation engineering and electric power engineering - 40%
Summarized financial information of the material associates	Sichuan Hydropower SECL Huaneng Finance Hanfeng Power Huaneng Group Fuel Company Hainan Nuclear 2017 2016 2017 2016 2017 2016 2017 2016 2017 2016 2017 2016 Gross amounts of the associates' Current assets 1,113,579 1,245,157 16,444,934 14,021,440 25,535,504 13,919,342 650,055 806,432 4,327,146 4,642,797 2,497,765 2,608,909 Non-current assets 14,590,921 14,676,021 56,079,321 46,584,060 20,786,497 18,055,386 2,246,412 2,616,639 4,102,426 4,269,520 22,490,989 23,939,921 Current liabilities (2,477,362 ) (2,410,462 ) (20,447,190 ) (16,564,310 ) (39,588,213 ) (25,344,346 ) (795,815 ) (1,045,876 ) (1,778,075 ) (1,939,210 ) (3,409,360 ) (3,330,581 ) Non-current liabilities (8,661,852 ) (8,901,599 ) (28,491,540 ) (19,395,060 ) (49,904 ) (57,368 ) (27,443 ) (37,103 ) (3,119,462 ) (3,432,326 ) (17,252,794 ) (18,356,288 ) Equity 4,565,286 4,609,117 23,585,525 24,646,130 6,683,884 6,573,014 2,073,209 2,340,092 3,532,035 3,540,781 4,326,600 4,861,961 -Equity attributable to shareholders 3,400,953 3,449,824 22,285,077 21,610,140 6,683,884 6,573,014 2,073,209 2,340,092 3,400,344 3,378,952 4,326,600 4,861,961 -Non-controlling interests 1,164,333 1,159,293 1,300,448 3,035,990 - - - - 131,691 161,829 - - Revenue 2,247,781 2,053,327 13,908,949 11,427,830 1,393,211 1,093,637 2,073,209 2,192,445 17,166,036 14,356,915 2,504,379 1,897,190 Profit/(loss) from continuing operations attributable to shareholders 222,403 173,220 747,657 1,362,028 718,970 660,089 52,361 290,470 48,876 102,363 (535,361 ) 18,618 Other comprehensive (loss)/income attributable to shareholders - - 521,965 (638,680 ) (28,099 ) (125,840 ) - - (6,654 ) 8,723 - - Total comprehensive income/(loss) attributable to shareholders 222,403 173,220 1,269,622 723,348 690,871 534,249 52,361 290,470 42,222 111,086 (535,361 ) 18,618 Dividend received from the associates 132,923 145,392 148,761 198,348 116,000 122,000 127,698 174,366 10,000 10,000 - - Reconciled to the interests in the associates Gross amounts of net assets attributable to shareholders of the associate 3,400,953 3,449,824 22,285,077 21,610,140 6,683,884 6,573,014 2,073,209 2,340,092 3,400,344 3,378,952 4,326,600 4,861,961 The Company's effective interest 49 % 49 % 25.02 % 25.02 % 20 % 20 % 40 % 40 % 50 % 50 % 30 % 30 % The Company's share of net assets attributable to shareholders of the associate 1,666,467 1,690,414 5,574,612 5,405,776 1,336,777 1,314,603 829,284 936,037 1,700,172 1,689,476 1,297,980 1,458,588 Impact of adjustments 207,586 207,586 1,161,810 1,161,810 - - 293,082 293,082 16,521 16,521 14,076 14,076 Carrying amount in the consolidated financial statements 1,874,053 1,898,000 6,736,422 6,567,586 1,336,777 1,314,603 1,122,366 1,229,119 1,716,693 1,705,997 1,312,056 1,472,664
Summarized financial information of material joint ventures	Shanghai Time Shipping Jiangsu Nantong Power Pakistan Sahiwal Project Related Investment 2017 2016 2017 2016 2017 Gross amounts of joint ventures' Current assets 665,410 883,120 656,720 815,359 3,069,065 Non-current assets 4,663,530 5,335,409 5,739,860 6,075,100 9,775,693 Current liabilities (3,316,709 ) (3,177,881 ) (2,939,371 ) (2,600,258 ) (1,955,211 ) Non-current liabilities (617,437 ) (1,506,076 ) (1,374,656 ) (1,931,219 ) (8,738,121 ) Equity 1,394,794 1,534,572 2,082,553 2,358,982 2,151,426 Included in the above assets and liabilities: Cash and cash equivalents 96,528 203,018 362,214 96,501 618,105 Current financial liabilities (excluding trade and other payables and provisions) (2,987,937 ) (2,681,857 ) (2,404,331 ) (2,270,601 ) (1,482,269 ) Non-current financial liabilities (excluding trade and other payables and provisions) (617,437 ) (1,506,076 ) (1,352,000 ) (1,931,219 ) (8,738,121 ) Revenue 3,532,065 3,561,091 3,451,983 3,354,545 2,321,510 (Loss)/profit from continuing operations (139,780 ) 1,212 271,364 608,660 (72,227 ) Other comprehensive loss - - - - (284,452 ) Total comprehensive (loss)/income (139,780 ) 1,212 271,364 608,660 (356,679 ) Dividend received in cash from the joint ventures - 275,000 724,453 - - Included in the above profit: Depreciation and amortization 317,133 340,826 396,500 393,221 63,122 Interest income 1,406 985 1,810 2,313 10 Interest expense 157,851 149,748 130,028 128,224 104,467 Income tax expense (45,741 ) 500 92,294 194,915 224,146 Reconciled to the interest in the joint venture: Gross amounts of net assets 1,394,794 1,534,572 2,082,553 2,358,982 2,151,426 The Company and its subsidiaries' effective interest 50 % 50 % 50 % 50 % 50 % The Company and its subsidiaries' share of net assets 697,397 767,286 1,041,277 1,179,491 1,075,713 Impact of adjustments 18,324 18,324 - - (361,965 ) Carrying amount in the consolidated financial statements 715,721 785,610 1,041,277 1,179,491 713,748
Aggregated information of individually immaterial associates and joint ventures	2017 2016 Aggregate carrying amount of individually immaterial associates and joint ventures in the consolidated financial statements 2,948,510 3,479,043 Aggregate amounts of the Company and its subsidiaries' share of those associates and joint ventures 70,965 263,392 Total comprehensive income 70,965 263,392

Investments in subsidiaries (Ta

Investments in subsidiaries (Tables)	12 Months Ended
	Dec. 31, 2017
Investments in subsidiaries [abstract]
Subsidiaries acquired through establishment or investment	Name of subsidiary Country of incorporation Type of interest held Registered capital Business nature and scope of operations Percentage of equity interest held Interest Voting Huaneng International Power Fuel Limited Liability Company PRC held directly RMB 200,000,000 Wholesale of coal 100% 100% Huaneng Shanghai Shidongkou Power Generation Limited Liability Company ("Shidongkou Power")(i) PRC held directly RMB 1,179,000,000 Power generation 50% 100% Huaneng Nantong Power Generation Limited Liability Company PRC held directly RMB 798,000,000 Power generation 70% 70% Huaneng Yingkou Co-generation Limited Liability Company PRC held directly RMB 844,030,000 Production and sales of electricity and heat sale of coal ash and lime 100% 100% Huaneng Hunan Xiangqi Hydropower Co., Ltd. PRC held directly RMB 328,000,000 Construction, operation and management of hydropower plants and related projects 100% 100% Huaneng Zuoquan Coal-fired Power Generation Limited Liability Company PRC held directly RMB 960,000,000 Construction, operation and management of electricity projects; Development and utilization of clean energy resources 80% 80% Huaneng Kangbao Wind Power Utilization Limited Liability Company PRC held directly RMB 407,200,000 Construction, operation and management of wind power plants and related projects; solar power generation 100% 100% Huaneng Jiuquan Wind Power Generation Co., Ltd. PRC held directly RMB 2,600,000,000 Construction, operation and management of wind power generation and related projects 100% 100% Huaneng Jiuquan II Wind Power Generation Co., Ltd. PRC held directly RMB 10,000,000 Construction, operation and management of wind power generation and related projects 100% 100% Huaneng Wafangdian Wind Power Generation Co., Ltd. PRC held directly RMB 50,000,000 Construction, operation and management of wind power generation and related projects 100% 100% Huaneng Changtu Wind Power Generation Co., Ltd. PRC held directly RMB 50,000,000 Construction, operation and management of wind power generation and related projects 100% 100% Huaneng Rudong Wind Power Generation Co., Ltd. PRC held directly RMB 90,380,000 Operation, management of wind power generation projects 90% 90% Huaneng Guangdong Haimen Port Limited Liability Company PRC held directly RMB 331,400,000 Loading, warehousing and conveying services, providing facility services and water transportation services 100% 100% Huaneng Taicang Port Limited Liability Company PRC held directly RMB 600,000,000 Port provision, cargo loading and storage 85% 85% Name of subsidiary Country of incorporation Type of interest held Registered capital Business nature and scope of operations Percentage of equity interest held Interest Voting Huaneng Taicang Power Generation Co., Ltd. PRC held directly RMB 804,146,700 Power generation 75% 75% Huaneng Huaiyin II Power Generation Limited Company PRC held directly RMB 930,870,000 Power generation 63.64% 63.64% Huaneng Xindian Power Generation Co., Ltd. PRC held directly RMB 465,600,000 Power generation 95% 95% Huaneng Shanghai Combined Cycle Power Limited Liability Company PRC held directly RMB 699,700,000 Power generation 70% 70% Huaneng Yumen Wind Power Generation Co., Ltd. PRC held directly RMB 719,170,000 Construction, operation and management of wind power generation and related projects 100% 100% Huaneng Qingdao Co-generation Limited Company PRC held directly RMB 214,879,000 Construction, operation and management of co-generation power plants and related projects 100% 100% Huaneng Tongxiang Combined Cycle Co-generation Co., Ltd. PRC held directly RMB 300,000,000 Production and sales of electricity and heat; investment in combined cycle co-generation industries 95% 95% Huaneng Eastern Yunnan Energy Mine Construction Co., Ltd. PRC held indirectly RMB 10,000,000 Mine engineering, construction engineering, equipment installation engineering 100% 100% Huaneng Nanjing Combined Cycle Co-generation Co., Ltd. PRC held directly RMB 582,000,000 Construction, operation and management of power plants and related projects 60% 60% Huaneng Shantou Haimen Power Generation Limited Liability Company PRC held directly RMB 1,508,000,000 Construction, operation and management of power plants and related projects 80% 80% Huaneng Chongqing Liangjiang Power Generation Limited Liability Company("Liangjiang Power") PRC held directly RMB 726,600,000 Construction, operation and management of natural gas power plants and related projects 90% 90% Chongqing Huaqing Energy Co., Ltd. ("Huaqing Energy") (ii) PRC held indirectly RMB 44,420,000 Providing thermal energy and cold energy services; supplying electricity 54% 60% Huaneng Yunnan Fuyuan Wind Power Generation Co., Ltd. PRC held directly RMB 157,290,000 Wind power project investment, management and sales 100% 100% Huaneng Guizhou Panxian Wind Power Generation Co., Ltd. PRC held directly RMB 86,500,000 Construction and management of wind power plants and related projects 100% 100% Huaneng Jiangxi Clean Energy Limited Liability Company PRC held directly RMB 5,000,000 Power generation and supply, development, management and construction of clean energy projects 100% 100% Name of subsidiary Country of incorporation Type of interest held Registered capital Business nature and scope of operations Percentage of equity interest held Interest Voting Huaneng Suzhou Combined Cycle Co-generation Co., Ltd. ("Suzhou Combined Cycle Co-generation") (ix) PRC held indirectly RMB 310,000,000 Construction and management of natural gas power plant and related projects 53.45% 100% Huaneng Hunan Subaoding Wind Power Generation Co., Ltd. PRC held directly RMB 266,000,000 Construction, operation and management of wind power plants and related projects 100% 100% Huaneng Suixian Jieshan Wind Power Generation Co., Ltd. PRC held directly RMB 96,500,000 Construction, operation and management of wind power plants and related projects 100% 100% Huaneng Taiyuan Dongshan Combined Cycle Co-generation Co., Ltd. PRC held directly RMB 600,000,000 Construction and operation of thermal heating network, development and utilization of clean energy resources 100% 100% Huaneng Xuzhou Tongshan Wind Power Generation Co., Ltd. PRC held directly RMB 2,644,560,000 Wind power generation, electricity engineering design services, maintenance of power supply and control facilities, solar energy power generation 70% 70% Huaneng Nanjing Co-generation Co., Ltd. PRC held directly RMB 300,000,000 Construction and operation of power plants, thermal heating services 70% 70% Huaneng Hunan Guidong Wind Power Generation Co., Ltd. PRC held directly RMB 140,000,000 Investment, construction, operation and management of electricity projects; development and utilization of clean energy resources 100% 100% Huaneng Nanjing Luhe Wind Power Generation Co., Ltd. PRC held directly RMB 63,800,000 Investment, construction, operation, management of electricity projects; development and utilization clean energy resources 100% 100% Huaneng Luoyuan Power Generation Limited Liability Company PRC held directly RMB 1,000,000,000 Construction, operation and management of power plants and related projects 100% 100% Huaneng Lingang (Tianjin) Gas Co-generation Co., Ltd. PRC held directly RMB 180,000,000 Providing generation and supply 100% 100% Huaneng Lingang (Tianjin) Heat Co-generation Co., Ltd. PRC held indirectly RMB 5,000,000 Providing thermal energy and cold energy services, supplying steam and hot water (except portable water), plumbing pipe installation and repair, energy engineering construction 66% 66% Huaneng Anhui Huaining Wind Power Generation Co., Ltd. PRC held directly RMB 122,000,000 Investment, construction and operation of electricity projects, development and utilization of clean energy resources 100% 100% Name of subsidiary Country of incorporation Type of interest held Registered capital Business nature and scope of operations Percentage of equity interest held Interest Voting Huaneng Mianchi Co-generation Limited Liability Company PRC held directly RMB 570,000,000 Construction, operation and management of coal-fired plants and related projects 60% 60% Huaneng Yingkou Xianrendao Co-generation Co., Ltd. PRC held directly RMB 277,690,000 Power generation and supply, development and utilization of clean energy resources 100% 100% Huaneng Nanjing Xingang Comprehensive Energy Co., Ltd. PRC held directly RMB 10,000,000 Thermal generation and supply, power distribution and sales 65% 65% Huaneng Changxing Photovoltaic Power Generation Limited Liability Company PRC held directly RMB 16,000,000 Construction and operation of distributed photovoltaic power generation plants and related projects 100% 100% Huaneng Rudong Baxianjiao Offshore Wind Power Generation Co., Ltd. PRC held directly RMB 610,000,000 Infrastructure construction of wind power plants 70% 70% Huaneng Guilin Gas Distributed Energy Co., Ltd. PRC held directly RMB 267,450,000 Construction, operation and management of power plants thermal management and related projects 80% 80% Huaneng (Dalian) Co-generation Co., Ltd. PRC held directly RMB 12,500,000 Construction, operation and management of co-generation power plants and related projects 100% 100% Huaneng Zhongxiang Wind Power Generation Co., Ltd. PRC held directly RMB 10,000,000 Construction, operation and management of wind power plants and related projects 100% 100% Huaneng Guanyun Co-generation Co., Ltd. PRC held directly RMB 15,000,000 Construction, operation and management of co-generation power plants, heating network and expansion engineering 100% 100% Huaneng International Power Hongkong Limited Company HongKong held directly 100,000 Shares Development, construction management and operation of power supply, coal projects; related investment and financing businesses 100% 100% Tuas Power Generation Pte. Ltd. ("TPG") Singapore held indirectly S$ 1,183,000,001 Power generation and related by-products, derivatives, developing power supply resources, operating electricity and power sales 100% 100% TP Utilities Pte. Ltd. Singapore held indirectly S$ 255,500,001 Provision of energy, power supply, thermal supply, management of industrial water and waste 100% 100% Name of subsidiary Country of incorporation Type of interest held Registered capital Business nature and scope of operations Percentage of equity interest held Interest Voting TP-STM Water Resources Pte. Ltd. Singapore held indirectly S$ 4,500,000 Providing desalinated water 60% 60% Huaneng Shanxi Taihang Power Generation Limited Liability Company PRC held directly RMB 1,086,440,000 Pre-services related to coal-fired generation 60% 60% Huaneng Mianchi Clean Energy Limited Liability Company PRC held directly RMB 10,000,000 Wind Power generation, new energy development and utilization 100% 100% Huaneng Zhuolu Clean Energy Limited Liability Company PRC held directly RMB 78,878,100 Construction, operation and management of power plants and related projects 100% 100% Huaneng Tongwei Wind Power Generation Limited Liability Company PRC held directly RMB 248,000,000 Construction, operation and management of wind power plants and related projects 100% 100% Huaneng Yizheng Wind Power Generation Limited Liability Company PRC held directly RMB 200,000,000 Wind power plants design, construction, management and maintenance 100% 100% Huaneng Yancheng Dafeng New Energy Power Generation Limited Liability Company PRC held directly RMB 5,000,000 Construction, operation and management of wind power, photovoltaic power plant 100% 100% Huaneng Shanyin Power Generation Limited Liability Company PRC held directly RMB 1,573,000,000 Construction, operation and management of power plants and related projects 51% 51% Huaneng Jiangsu Energy Sales Limited Liability Company PRC held directly RMB 200,000,000 Purchase and sales of electricity and thermal energy, water supply services, construction and operation of electricity distribution network and heating pipe network 100% 100% Huaneng Liaoning Energy Sales Limited Liability Company PRC held directly RMB 200,000,000 Sales of electricity, thermal energy and circulating hot water 100% 100% Huaneng Guangdong Energy Sales Limited Liability Company PRC held directly RMB 200,000,000 Power and thermal energy supply, energy conservation technology service, transmission and substation projects contracting 100% 100% Huaneng Suizhou Power Generation Limited Liability Company PRC held directly RMB 50,000,000 Construction, operation and management of power plants, production and sales of electricity and heating 100% 100% Huaneng Changle Photovoltaic Power Generation Limited Liability Company PRC held directly RMB 10,000,000 Construction, operation and management of photovoltaic power plants and related projects 100% 100% Huaneng Longyan Wind Power Generation Limited Liability Company PRC held directly RMB 10,000,000 Construction, operation and management of wind power plants and related projects 100% 100% Name of subsidiary Country of incorporation Type of interest held Registered capital Business nature and scope of operations Percentage of equity interest held Interest Voting Huaneng Yunnan Malong Wind Power Generation Limited Liability Company PRC held directly RMB 10,000,000 Construction, operation and management of wind power plants and related projects 100% 100% Huaneng Dandong Photovoltaic Power Generation Limited Liability Company PRC held directly RMB 17,720,000 Investment, construction operation and management of electricity projects, development and utilization of clean energy resources 100% 100% Huaneng Dongguan Combined Cycle Co-generation Limited Liability Company PRC held directly RMB 50,000,000 Investment of electricity projects, thermal power generation and supply, investment in heating pipe network, development and utilization of clean energy resources 100% 100% Huaneng Yangxi Photovoltaic Power Generation Limited Liability Company PRC held directly RMB 62,500,000 Photovoltaic electric power production and sales 80% 80% Huaneng Chongqing Fengjie Wind Power Generation Limited Liability Company PRC held directly RMB 10,000,000 Electricity production and supply; development and utilization of clean energy resources 100% 100% Huaneng Changxing Hongqiao Photovoltaic Power Generation Limited Liability Company PRC held directly RMB 10,000,000 Electricity production and supply; development and utilization of clean energy resources 100% 100% Huaneng Jingxing Photovoltaic Power Generation Limited Liability Company PRC held directly RMB 100,000 Investment, construction and management of photovoltaic power plants 100% 100% Huaneng Shanxi Energy Sales Limited Liability Company PRC held directly RMB 210,000,000 Electricity supply and sales, investment, construction, operation and repair of regional transmission and distribution network 100% 100% Huaneng Chongqing Energy Sales Limited Liability Company PRC held directly RMB 210,000,000 Operation of natural gas, electric energy and thermal energy products sales 100% 100% Huaneng Chongqing Luohuang Energy Sales Limited Liability Company PRC held indirectly RMB 210,000,000 Sales and supply of electricity, sales of thermal products 90% 90% Huaneng Chongqing Tongliang Energy Sales Limited Liability Company PRC held indirectly RMB 210,000,000 Operation of natural gas, sales of electricity supply, sales of thermal products 51% 51% Huaneng Hunan Energy Sales Limited Liability Company PRC held directly RMB 210,000,000 Electricity and thermal energy products sales 100% 100% Huaneng Jiangxi Energy Sales Limited Liability Company PRC held directly RMB 210,000,000 Construction, operation and management of heating and power supply facilities 100% 100% Name of subsidiary Country of incorporation Type of interest held Registered capital Business nature and scope of operations Percentage of equity interest held Interest Voting Huaneng Hebei Energy Sales Limited Liability Company PRC held directly RMB 210,000,000 Construction, installation, maintenance and repair of heating and power supply facilities 100% 100% Huaneng Henan Energy Sales Limited Liability Company PRC held directly RMB 210,000,000 Sales of electricity, heating, gas and other energy products 100% 100% Huaneng Handan Heating Limited Liability Company PRC held directly RMB 100,000,000 Construction, operation and maintenance of heating sources and pipe network 100% 100% Huaneng (Huzhou Development Zone) Photovoltaic Power Generation Limited Liability Company PRC held directly RMB 10,000,000 Photovoltaic power generation; power supply, purchase and sales 100% 100% Huaneng Fujian Energy Sales Limited Liability Company PRC held directly RMB 210,000,000 Sales of electricity, heating, gas and other energy products 100% 100% Huaneng Hubei Energy Sales Limited Liability Company PRC held directly RMB 210,000,000 Sales of electricity, heating, gas and other energy products 100% 100% Huaneng (Sanming) PRC held directly RMB Construction, operation 100% 100% Huaneng Yueyang Xingang Photovoltaic Power Generation Limited Liability Company PRC held directly RMB 16,000,000 Construction, operation and management of electricity projects, development and utilization of clean energy 60% 60% Huaneng Shanghai Energy Sales Limited Liability Company PRC held directly RMB 210,000,000 Power supply (except construction and operation of electricity network), technology services in energy conservation and environmental protection 100% 100% Huaneng Yushe Photovoltaic Power Generation Limited Liability Company PRC held directly RMB 10,000,000 Production and supply of electric power 100% 100% Huaneng Anhui Energy Sales Limited Liability Company PRC held directly RMB 210,000,000 Sales of electricity, heating gas and other energy products 100% 100% Huaneng (Shanghai) Power Maintenance Limited Liability Company PRC held directly RMB 200,000,000 Contracting installation and repair of electricity facilities 100% 100% Huaneng Guanyun Clean Energy Power Limited Liability Company PRC held directly RMB 26,000,000 Sales of electricity 100% 100% Name of subsidiary Country of incorporation Type of interest held Registered capital Business nature and scope of operations Percentage of equity interest held Interest Voting Huaneng Jianchang Photovoltaic Power Generation Limited Liability Company* PRC held directly RMB 10,000,000 Production and supply of electricity, development and utilization of clean energy resources 100% 100% Huaneng Chaoyang Photovoltaic Power Generation Limited Liability Company* PRC held directly RMB 10,000,000 Production and supply of electricity, development and utilization of clean energy resources 100% 100% Huaneng (Luoyuan) Port Limited Company (x) PRC held directly RMB 169,710,000 Port management, investment and development 100% 100% Huaneng Shijiazhuang Energy Limited Liability Company PRC held directly RMB 60,000,000 Production and supply of heating, purchase and sales of electricity 66.60% 66.60% Huaneng Jiangyin Combined Cycle Co-generation Limited Liability Company* PRC held directly RMB 600,000,000 Production and supply of electricity, production and supply of heating 51% 51% Huaneng Anyang Energy Limited Liability Company PRC held directly RMB 10,000,000 Production and supply of electricity, production and supply of heating 100% 100% Huaneng Shanxi Comprehensive Energy Limited Liability Company PRC held directly RMB 120,000,000 Production and supply of electricity, production and supply of heating 100% 100% Huaneng Zhanhua Photovoltaic Power Generation Limited Company ("Zhanhua Photovoltaic Company") (vi)* PRC held indirectly RMB 145,790,000 Photovoltaic power generation 46.40% 58% Huaneng Weishan New Energy Limited Company ("Weishan New Energy") (vi)* PRC held indirectly RMB 167,000,000 Investment, production and sales of new energy power generation projects 40% 100% Huaneng Ruyi (Helan) New Energy Limited Company ("Helan New Energy") (vi)* PRC held indirectly RMB 19,000,000 Photovoltaic power generation 40% 100% Huaneng Dezhou New Energy Limited Company (vi)* PRC held indirectly RMB 2,500,000 Photovoltaic power generation, wind power generation, biomass power generation 80% 100% Zhaodong Huaneng Dechang Solar Power Generation Limited Company* PRC held indirectly RMB 30,810,000 Solar energy generation and technology promotion, repair electricity facilities 100% 100% Daqing Huaneng Shuangyu Solar Power Generation Limited Company* PRC held indirectly RMB 20,000,000 Solar energy generation 100% 100% Huaneng Taizhouwan Juji District Photovoltaic Power Generation Limited Liability Company* PRC held directly RMB 100,000 Production and supply of electricity projects 100% 100% Name of subsidiary Country of incorporation Type of interest held Registered capital Business nature and scope of operations Percentage of equity interest held Interest Voting Huaneng Mingguang Wind Power Generation Limited Liability Company* PRC held directly RMB 10,000,000 Production and supply of electricity; investment,construction, operation and management of electricity projects 100% 100% Huaneng Guangxi Energy Sales Limited Liability Company* PRC held directly RMB 210,000,000 Power supply, contracting installation and repair of electricity facilities 100% 100% Huaneng Ruzhou Clean Energy Limited Liability Company* PRC held directly RMB 80,000,000 Production and supply of electricity projects, investment, construction and operation of electricity projects 95% 95% Huaneng Hunan Lianping Wind Power Generation Limited Liability Company* PRC held directly RMB 173,920,000 Production and supply of electricity 80% 80% Huaneng Abagaqi Clean Energy Limited Liability Company* PRC held directly RMB 100,000 Production, supply and sales of electricity and thermal energy 100% 100% Huaneng Jiashan Photovoltaic Power Generation Limited Liability Company* PRC held directly RMB 10,000,000 Production and supply of electricity 100% 100% Huaneng Zhejiang Energy Sales Limited Liability Company* PRC held directly RMB 210,000,000 New energy technology development, technology consulting, transferring of results 100% 100% Huaneng Guangdong Shantou Power Generation Limited Liability Company* PRC held directly RMB 10,000,000 Production and supply of electricity and thermal energy 100% 100% Huaneng Shantou Photovoltaic Power Generation Limited Liability Company* PRC held directly RMB 100,000 Production and supply of electricity 100% 100% Huaneng Guigang Clean Energy Limited Liability Company* PRC held directly RMB 10,000,000 Production and supply of electricity, investment, construction and operation of electricity projects 100% 100% Huaneng Changxing Jiapu Photovoltaic Power Generation Limited Liability Company* PRC held directly RMB 10,000,000 Production and supply of electricity, investment in electricity projects 100% 100% Huaneng Hainan Energy Sales Limited Liability Company* PRC held indirectly RMB 210,000,000 Construction and operation of heat and power supply facilities, operation of heat resources, heat network and power supply facilities 91.80% 91.80% Huaneng Yangpu Co-generation Limited Company* PRC held indirectly RMB 802,222,000 Investment, construction operation and management of electricity projects and heat pipe network 82.62% 82.62%
Subsidiaries acquired from business combinations under common control	Name of subsidiary Country of incorporation Type of interest held Registered capital Business nature and scope of operations Percentage of equity interest held Interest Voting Huaneng (Suzhou Industrial Park) Power Generation Co., Ltd PRC held directly RMB 632,840,000 Power generation 75% 75% Huaneng Qinbei Power Generation Co., Ltd. ("Qinbei Power") PRC held directly RMB 1,540,000,000 Power generation 60% 60% Huaneng Yushe Power Generation Co., Ltd. PRC held directly RMB 615,760,000 Power generation, power distribution, sales of power 60% 60% Huaneng Hunan Yueyang Power Generation Limited Liability Company PRC held directly RMB 1,935,000,000 Power generation 55% 55% Huaneng Chongqing Luohuang Power Generation Limited Liability Company ("Luohuang Power") PRC held directly RMB 1,748,310,000 Power generation 60% 60% Huaneng Pingliang Power Generation Co., Ltd. PRC held directly RMB 924,050,000 Power generation 65% 65% Huaneng Nanjing Jinling Power Generation Co., Ltd. PRC held directly RMB 1,513,136,000 Power generation 60% 60% Huaneng Qidong Wind Power Generation Co., Ltd. PRC held directly RMB 391,738,500 Development of wind power projects, production and sales of electricity 65% 65% Tianjin Huaneng Yangliuqing Co-generation Limited Liability Company ("Yangliuqing Co-generation") PRC held directly RMB 1,537,130,909 Power generation, heat supply, facilities installation, maintenance and related services 55% 55% Huaneng Beijing Co-generation Limited Liability Company ("Beijing Co-generation") (iii) PRC held directly RMB 3,702,090,000 Construction and operation of power plants and related construction projects 41% 66% Huaneng Wuhan Power Generation Co., Ltd. ("Wuhan Power") PRC held directly RMB 1,478,461,500 Investment, construction, operation and management of electricity projects, development and utilization of clean energy resources 75% 75% Huaneng Anyuan Power Generation Co., Ltd. ("Anyuan Power") PRC held directly RMB 1,175,117,300 Construction and operation of power plants and related construction projects, Production of electricity 100% 100% Huaneng Hualiangting Hydropower Co., Ltd. ("Hualiangting Hydropower") PRC held directly RMB 50,000,000 Generation and transfer of power supply, water supply (irrigation) 100% 100% Huaneng Chaohu Power Generation Co., Ltd. ("Chaohu Power") (iv) PRC held directly RMB 840,000,000 Construction, operation, management of electricity projects,development and utilization of clean energy resources 60% 70% Huaneng Jingmen Thermal Power Co., Ltd. ("Jingmen Thermal Power") PRC held directly RMB 780,000,000 Thermal power, power development and other service 100% 100% Name of subsidiary Country of incorporation Type of interest held Registered capital Business nature and scope of operations Percentage of equity interest held Interest Voting Enshi Qingjiang Dalongtan Hydropower Development Co., Ltd. ("Dalongtan Hydropower") PRC held directly RMB 76,000,000 Hydropower development, production and management of electric power, urban water supply 97% 97% Huaneng Suzhou Thermal Power Co., Ltd. ("Suzhou Thermal Power") PRC held directly RMB 600,000,000 Construction, operation and management of electricity projects, development and utilization of clean energy 53.45% 100% Huaneng Hainan Power Generation Limited Company ("Hainan Power") PRC held directly RMB 1,326,419,587 Investment, construction operation of various power plants, regular energy and new energy development 91.80% 91.80% Huaneng Ruijin Power Generation Co., Ltd. ("Ruijin Power Generation") PRC held directly RMB 536,923,299 Construction, operation, management of electricity projects, development and utilization of clean energy 100% 100% Huaneng Yingcheng Thermal Power Co., Ltd. ("Yingcheng Thermal Power") PRC held directly RMB 650,000,000 Construction and operation of power plants and production, sales of power and heat 100% 100% Huaneng Heilongjiang Power Generation Limited Company ("Heilongjiang Power") PRC held directly RMB 783,350,000 Development, investment, construction, production and management of power (thermal) projects 100% 100% Huaneng Hegang Power Generation Limited Company ("Hegang Power") PRC held indirectly RMB 1,092,550,000 The electricity power construction, energy conservation and development projects, heat production and supply 64% 64% Huaneng Xinhua Power Generation Limited Liability Company ("Xinhua Power") PRC held indirectly RMB 284,880,000 Power generation, power equipment repair 70% 70% Huaneng Tongjiang Wind Power Generation Limited Company ("Tongjiang Wind Power") PRC held indirectly RMB 330,000,000 Wind power generation, wind power plants operation, planning and design 82.85% 82.85% Huaneng Daqing Thermal Power Limited Company ("Daqing Thermal Power") PRC held indirectly RMB 630,000,000 Power generation, thermal production and supply 100% 100% Daqing Luyuan Wind Power Generation Limited Company ("Luyuan Wind Power") PRC held indirectly RMB 451,000,000 Wind power generation 100% 100% Huaneng Yichun Thermal Power Limited Company ("Yichun Thermal Power") PRC held indirectly RMB 534,000,000 Power construction, production and sales, thermal production and sales production of heat and hot water 100% 100% Huaneng Heilongjiang Energy Sales Limited Company ("Heilongjiang Energy Sales") PRC held indirectly RMB 210,000,000 Power supply, 100% 100% Percentage of equity interest held Name of subsidiary Country of incorporation Type of Interest held Registered capital Business nature and scope of operations Interest Voting Zhaodong Huaneng Thermal Power Limited Company ("Zhaodong Thermal Power") PRC held indirectly RMB 10,000,000 Heating production and supply 100% 100% Huaneng Jilin Power Generation Limited Company ("Jilin Power") PRC held directly RMB 1,917,130,000 Power (thermal) projects, development of new energy projects investment, construction, production, operation and sales 100% 100% Huaneng Linjiang Jubao Hydropower Limited Company ("Jubao Hydropower") PRC held indirectly RMB 20,000,000 Hydropower development and operation, construction and operation of photovoltaic power generation 100% 100% Huaneng Jilin Energy Sales Limited Company ("Jilin Energy Sales - PRC held indirectly RMB 210,000,000 Thermal (cold) production and supply, power supply 100% 100% Huaneng Jilin Biological Power Generation Limited Company ("Jilin Biological Power') PRC held indirectly RMB 183,800,000 Biomass power generation 100% 100% Huaneng Shandong Power Generation Limited Company ("Shandong Power") PRC held directly RMB 4,241,460,000 Power (thermal) project development, investment. construction and management 80% 80% Huaneng Jining New Energy Limited Company ("Jining New Energy") (vi) PRC held indirectly RMB 38,000,000 investment, construction and management of photovoltaic and wind power projects 80% 100% Huaneng Zibo Boshan Photovoltaic Power Limited Company ("Zibo Photovoltaic") (vi) PRC held indirectly RMB 22,000.000 Solar power generation, sales 80% 100% Huaneng Rizhao Thermal Power Limited Company ("Rizhao Thermal Power") (vi) PRC held indirectly RMB 52,000,000 Urban heat construction, maintenance and operation design and construction of heat engineering 80% 100% Huaneng Laiwu New Energy Limited Company ("Laiwu New Energy") (vi) PRC held indirectly RMB 68,000,000 Photovoltaic power and wind power generation 80% 100% Huaneng Shandong Sishui New Energy Limited Company ("Sishui New Energy") (vi) PRC held indirectly RMB 36,000,000 Solar energy grid connected generation 80% 100% Huaneng Shandong Electric And Thermal Power Marketing Limited Company ("Shandong Power Marketing") (vi) PRC held indirectly RMB 200,000,000 Sales and service of power and heating products, investment in power industry 80% 100% Huaneng Shandong Information Technology Limited Company ("Shandong Power Information Company") (vi) PRC held indirectly RMB 80,000,000 Information technology and management consulting services 80% 100% Huaneng Penglai Wind Power Generation Limited Company ("Penglai Wind Power") (vi) PRC held indirectly RMB 177,210,000 Development, investment, construction and management of wind power projects 80% 100% Percentage of equity interest held Name of subsidiary Country of incorporation Type of Interest held Registered capital Business nature and scope of operations Interest Voting Huaneng Zhanhua New Energy Limited Company ("Zhanhua New Energy") (vi) PRC held indirectly RMB 235,298,200 Wind power, photovoltaic power generation 80% 100% Huaneng Venial Bajiao Thermal Power Limited Company ("Hajino Thermal Power") (vi) PRC held indirectly RMB 540,000,000 Power generation projects preparation 80% 100% Huaneng Weihai Port Photovoltaic Power Generation Limited Company ("Port Photovoltaic") (vi) PRC held indirectly RMB 24,960,000 Photovoltaic power generation projects development and construction, electricity sales 80% 100% Huaneng Zibo Baiyanghe Power Generation Limited Company ("Baiyanghe Power") (vi) PRC held indirectly RMB 1,098,567,344 Power production, ongrid sales, thermal production and supply 80% 100% Huaneng Yantai Power Generation Limited Company ("Venial Power") (vi) PRC held indirectly RMB 547,479,100 Production and sales of electricity power and heat 80% 100% Huaneng Jinan Huangtai Power Generation Limited Company ("Huangtai Power") (vi) PRC held indirectly RMB 1,391,878,400 Electricity power production, heating management 72% 90% Huaneng Dezhou Thermal Power Limited Company ("Dezhou Thermal Power") (vi) PRC held indirectly RMB 20,000,000 Urban heat construction, maintenance and operation design and construction of heat engineering 68% 85% Huaneng Dongying New Energy Limited Company ("Dongying New Energy") (vi) PRC held indirectly RMB 87,906,822 Wind power projects development, wind power generation and sales of electricity 56% 70% Huaneng Shandong Power Generation Maintenance Technology Limited Company ("Shandong Maintenance Company") (vi) PRC held indirectly RMB 50,000,000 Power engineering design, construction and construction 76.55% 100% Huaneng Shandong Electric Power Fuel Limited Company ("Shandong Fuel Company') (vi) PRC held indirectly RMB 100,000,000 Wholesale operation of coal 76.55% 100% Shandong Rizhao Power Generation Limited Company ("Rizhao Power")(vi) PRC held indirectly RMB 1,245,587,900 Heat, engaged in power business 88.80% 100% Huaneng Laiwu Power Generation Limited Company ("Laiwu Power") (vi) PRC held indirectly RMB 1,800,000,000 Power production 64% 80% Huaneng Shandong Ruyi Coal Power Limited Company ("Ruyi Coal Power") (vi) PRC held indirectly RMB 1,294,680,000 Development, investment, construction, operation and management of electricity power and coal 40% 100% Huaneng Jiaxiang Power Generation Limited Company ("Jiaxiang Power") (vi) PRC held indirectly RMB 646,680,000 Power generation, electrical equipment maintenance 40% 100% Percentage of equity interest held Name of subsidiary Country of incorporation Type of Interest held Registered capital Business nature and scope of operations Interest Voting Huaneng Qufu Co-generation Limited Company ("Qufu Co-generation") (vi) PRC held indirectly RMB 300,932,990 Sales and production of electric power, thermal power 40% 100% Huaneng Jining Hi-Tech Zone Co-generation Limited Company ("Jining Co-generation") (vi) PRC held indirectly RMB 118,699,760 Heat supply and power generation 40% 100% Huaneng Shandong (Hongkong) Investment Limited Company ("Hong Kong Investment") (vi) Hong Kong held indirectly 10,000 Shares Investment 80% 100% Shandong Silk Road International Power Limited Company ("Shandong Silk Road") (vi) PRC held indirectly RMB 35,000,000 Contracting overseas projects and domestic international bidding projects, construction and operation of power projects 80% 100% Shandong Changdao Wind Power Generation Limited Liability Company ("Changdao Wind Power") (vi) PRC held indirectly RMB 33,500.000 Wind power, on-grid sales 48% 60% Huaneng Rongcheng New Energy Co., Ltd. ("Rongcheng New Energy'', (vi) PRC held indirectly RMB 36,540,000 Wind power generation 48% 100% Huaneng Jining Yunhe Power Generation Co., Ltd. ("Yunhe Power") (vi) PRC held indirectly RMB 696,355,300 Electrical (thermal) production and on-grid sales, technology consulting and services 78.68% 98.35% Huaneng Linyi Power Generation Limited Company ("Linyi Power") (vi) PRC held indirectly RMB 1,093,313,404 Power generation 60% 75% Liaocheng Changrun National Electric Heating Limited Company ("Liaocheng Changrun") (vi) PRC held indirectly RMB 130,000,000 Heat operation, installation and repair of water, electricity, heating 60% 75% Linyi Lantian Thermal Power Limited Company ("Lantian Thermal Power") (vi) PRC held indirectly RMB 36,000,000 Heat supply, maintenance of thermal power network, power sales, installation and maintenance of distribution facilities 54.40% 68% Yantai 500 Heating Limited Company ("Yantai 500") (vi) PRC held indirectly RMB 20,500,000 Central heat services, plumbing and pipe installation services 64% 80% Huaneng Liaocheng Co-generation Limited Company ("Liaocheng Co-generation) (vi) PRC held indirectly RMB 610,670,000 Power, heat production and sales 60% 100% Huaneng Henan Zhongyuan Gas Power Generation Co., Ltd. ("Zhongyuan Gas") PRC held directly RMB 400,000,000 Investment, construction, operation and management of power projects. thermal supply, development and utilization of clean energy resources 90% 90%
Subsidiaries acquired from business combinations not under common control	Percentage of equity interest held Name of subsidiary Country of incorporation Type of Interest held Registered capital Business nature and scope of operations Interest Voting Huaneng Weihai Power Generation Limited Liability Company ("Weihai Power") PRC held directly RMB 1,822,176,621 Power generation 60% 60% Huaneng Huaiyin Power Generation Limited Company PRC held directly RMB 265,000,000 Power generation 100% 100% Huade County Daditaihong Wind Power Utilization Limited Liability Company PRC held directly RMB 196,400,000 Wind power development and utilization 100% 100% Huaneng Zhanhua Co-generation Limited Company PRC held directly RMB 190,000,000 Production and sales of electricity and thermal energy 100% 100% Shandong Hualu Sea Transportation Limited Company PRC held directly RMB 100,000,000 Cargo transportation along domestic coastal areas, goods storage 53% 53% Huaneng Qingdao Port Limited Company PRC held directly RMB 219,845,000 Loading and conveying warehousing, conveying, water carriage materials supply 51% 51% Huaneng Yunnan Diandong Energy Limited Liability Company ("Diandong Energy") PRC held directly RMB 3,769,140,000 Electricity projects investment power generation and sales, coal exploitation and investment 100% 100% Yunnan Diandong Yuwang Energy Limited Company ("Diandong Yuwang") PRC held directly RMB 1,700,740,000 Electricity projects investment power generation and sales, coal exploitation and investment 100% 100% Huaneng Suzihe Hydropower Development Limited Company PRC held directly RMB 50,000,000 Hydropower, aquaculture, agriculture irrigation 100% 100% Enshi City Mawei Valley Hydropower Development Co, Ltd. PRC held directly RMB 101,080,000 Hydro-resource development hydropower, aquaculture 100% 100% Huaneng Luoyang Co-generation Limited Liability Company PRC held directly RMB 600,000,000 Production and sales of electricity and heating 80% 80% Huaneng Jinling Combined Cycle Co-generation Co., Ltd. ("Jinling CCGT") (vii) PRC held directly RMB 356,350,000 Construction and management of power plants and related projects 51% 72% Huaneng Zhumadian Wind Power Generation Co, Ltd. PRC held directly RMB 30,000,000 Wind power generation, new energy development and utilization 90% 90% SinoSing Power Singapore held directly US$ 1,476,420,585 Investment holding 100% 100% Tuas Power Singapore held indirectly S$ 1,433,550,000 Investment holding 100% 100% Tuas Power Supply Pte Ltd. Singapore held indirectly S$ 500,000 Power sales 100% 100% TP Asset Management Pte Ltd. Singapore held indirectly S$ 2 Render of environment engineering services 100% 100% TPGS Green Energy Pte Ltd. Singapore held indirectly S$ 1,000,000 Provision of utility services 75% 75% NewEarth Pte Ltd. Singapore held indirectly S$ 10,111,841 Consultancy in waste recycling 100% 100% NewEarth Singapore Pte Ltd. Singapore held indirectly S$ 17,816,050 Industrial waste management and recycling 100% 100% Percentage of equity interest held Name of subsidiary Country of incorporation Type of Interest held Registered capital Business nature and scope of operations Interest Voting Xuzhou Tongshan District Xiehe Wind Power Generation Limited Liability Company ("Tongshan Xiehe Wind Power Generation") PRC held indirectly RMB 3,000,000 Wind power generation 100% 100% Luoyang Yangguang Co-generation Limited Liability Company ("Yangguang Co-generation") PRC held indirectly RMB 250,000,000 Production and supply of electricity and heat power 100% 100% Shanxi Xiaoyi Economic Development Zone Huaneng Energy Service Co, Ltd. ("Shanxi Xiaoyi Energy") (viii) (Note 40) PRC held indirectly RMB 100,000,000 Electricity sales, sales of raw coal and processed coal 51% 100% Ruzhou Xuji Wind Power Generation Limited Co. Ltd (Note 40) PRC held indirectly RMB 4,000,000 Wind power and photovoltaic power generation 95% 100%

Available-for-sale financial 56

Available-for-sale financial assets (Tables)	12 Months Ended
	Dec. 31, 2017
Available-for-sale financial assets [abstract]
Available-for-sale financial assets	As at 31 December 2017 2016 Listed security (Fair value measurement) China Yangtze Power Co., Ltd. - 1,820,255 Others 9,223 458 Subtotal 9,223 1,820,713 Unlisted securities (Cost measurement) 10% of Shanxi Xishan Jinxing Energy Co., Ltd. 531,274 531,274 9.09% of Ganlong Double-track Railway Co., Ltd. 1,000,000 1,000,000 Others 64,496 54,045 Subtotal 1,595,770 1,585,319 Total 1,604,993 3,406,032

Land use rights (Tables)

Land use rights (Tables)	12 Months Ended
	Dec. 31, 2017
Land use rights [abstract]
Detailed information about land use rights	2017 2016 Beginning of the year Cost 10,525,537 10,059,872 Accumulated amortization (1,792,367 ) (1,530,972 ) Accumulated impairment losses (276,823 ) (215,134 ) Net book value 8,456,347 8,313,766 Movement: Business combination (Note 40) 3,182,914 61,027 Addition 331,683 364,280 Amortization charge for the year (368,898 ) (242,400 ) Impairment charge for the year (Note 7) (108,590 ) (51,981 ) Disposals (86,631 ) (1,969 ) Disposal of subsidiaries (146,922 ) - Currency translation differences 4,882 13,624 End of the year 11,264,785 8,456,347 Cost 13,775,976 10,525,537 Accumulated amortization (2,128,752 ) (1,792,367 ) Accumulated impairment losses (382,439 ) (276,823 ) Net book value 11,264,785 8,456,347

Power generation licenses (Tabl

Power generation licenses (Tables)	12 Months Ended
	Dec. 31, 2017
Power generation licenses [abstract]
Detailed information about power generation license	2017 2016 Beginning of the year 3,849,199 3,679,175 Movement: Currency translation differences 67,047 170,024 End of the year 3,916,246 3,849,199

Mining rights (Tables)

Mining rights (Tables)	12 Months Ended
	Dec. 31, 2017
Mining rights [abstract]
Detailed information about mining rights	2017 2016 Beginning of the year Cost 2,406,567 2,406,567 Accumulated impairment losses (760,296 ) (760,296 ) Net book value 1,646,271 1,646,271 Movement: Addition - - Impairment charge for the year - - End of the year 1,646,271 1,646,271 Cost 2,406,567 2,406,567 Accumulated impairment losses (760,296 ) (760,296 ) Net book value 1,646,271 1,646,271

Derivative financial instrume60

Derivative financial instruments (Tables)	12 Months Ended
	Dec. 31, 2017
Derivative financial instruments [abstract]
Details of derivative financial instruments	As at 31 December 2017 2016 Derivative financial assets －Hedging instruments for cash flow hedge (fuel swap contracts) 330,966 264,535 －Hedging instruments for cash flow hedge (exchange forward contracts) - 107,907 －Financial instruments at fair value through profit or loss (fuel swap contracts) 2,726 5,881 Total 333,692 378,323 Less: non-current portion －Hedging instruments for cash flow hedge (fuel swap contracts) 75,328 71,341 －Hedging instruments for cash flow hedge (exchange forward contracts) - 28,380 Total non-current portion 75,328 99,721 Current portion 258,364 278,602 Derivative financial liabilities －Hedging instruments for cash flow hedge (fuel swap contracts) 11,794 164,464 －Hedging instruments for cash flow hedge (exchange forward contracts) 68,102 454 －Hedging instruments for cash flow hedge (interest rate swap contracts) 130,643 169,201 －Financial instruments at fair value through profit or loss (fuel swap contracts) 125 619 Total 210,664 334,738 Less: non-current portion －Hedging instruments for cash flow hedge (fuel swap contracts) 2,026 31,673 －Hedging instruments for cash flow hedge (exchange forward contracts) 21,745 295 －Hedging instruments for cash flow hedge (interest rate swap contracts) 124,715 169,201 Total non-current portion 148,486 201,169 Current portion 62,178 133,569
Analysis of contractual cash inflows/ (outflows) of major derivative financial instruments	Cash flows Carrying amounts Contractual cash flows Within 1 year Between 1 and 5 years After 5 years As at 31 December 2017 Derivative financial assets Fuel derivatives used for hedging (net settlement) 330,966 330,966 255,638 75,328 - Fuel derivatives that do not qualify as hedges (net settlement) 2,726 2,726 2,726 - Derivative financial liabilities Fuel derivatives used for hedging (net settlement) 11,794 (11,794 ) (9,768 ) (2,026 ) - Forward exchange contracts used for hedging - inflows 2,509,363 2,041,812 467,551 - - outflows (2,568,034 ) (2,083,441 ) (484,593 ) - 68,102 (58,671 ) (41,629 ) (17,042 ) - Net-settled interest rate swaps used for hedging - net cash inflows/(outflows) 130,643 (154,367 ) (82,533 ) (71,834 ) - Fuel derivatives that do not qualify as hedges (net settlement) 125 (125 ) (125 ) - As at 31 December 2016 derivative financial assets Fuel derivatives used for hedging (net settlement) 264,535 264,535 193,194 71,341 - Forward exchange contracts used for hedging - inflows 2,118,946 1,488,071 630,875 -- - outflows (2,009,205 ) (1,407,606 ) (601,599 ) - 107,907 109,741 80,465 29,276 - Fuel derivatives that do not qualify as hedges (net settlement) 5,881 5,881 5,881 - - Derivative financial liabilities Fuel derivatives used for hedging (net settlement) 164,464 (164,464 ) (132,792 ) (31,672 ) - Forward exchange contracts used for hedging - inflows 527,939 475,881 52,058 - - outflows (528,454 ) (476,104 ) (52,350 ) - 454 (515 ) (223 ) (292 ) - Net ― - net cash inflows/(outflows) 169,201 (228,905 ) (113,563 ) (115,342 ) - Fuel derivatives that do not qualify as hedges (net settlement) 619 (619 ) (619 ) - -

Goodwill (Tables)

Goodwill (Tables)	12 Months Ended
	Dec. 31, 2017
Goodwill [abstract]
Movements of goodwill	2017 2016 Beginning of the year Cost 15,391,642 14,919,930 Accumulated impairment losses (3,255,913 ) (3,242,748 ) Net book value 12,135,729 11,677,182 Movement: Business combination (Note 40) 3,167,566 - Disposal of subsidiary-cost (309,269 ) - Disposal of subsidiary-impairment 309,269 - Currency translation differences-cost 186,015 471,712 Currency translation differences-impairment (5,190 ) (13,165 ) End of the year 15,484,120 12,135,729 Cost 18,435,954 15,391,642 Accumulated impairment losses (2,951,834 ) (3,255,913 ) Net book value 15,484,120 12,135,729
Carrying amounts of major goodwill allocated to individual CGUs	2017 2016 PRC Power segment: Shandong Power 2,739,818 - Wuhan Power 518,484 518,484 Hainan Power 506,336 506,336 Heilongjiang Power 265,319 - Yangliuqing Cogeneration 151,459 151,459 Qinbei Power 109,913 109,913 Jilin Power 109,826 - Yueyang Power Company 100,907 100,907 Beijing Cogeneration 95,088 95,088 Singapore segment: Tuas Power 10,561,956 10,381,131
Discount rates used for value-in-use calculations	PRC Power segment 8.51%-13.59 % Singapore segment 7.30 %

Other non-current assets (Table

Other non-current assets (Tables)	12 Months Ended
	Dec. 31, 2017
Other non-current assets [abstract]
Details of other non-current assets	As at 31 December 2017 2016 VAT recoverable 2,741,604 1,651,891 Prepayments for pre-construction cost 937,161 - Intangible assets * 697,884 411,308 Finance lease receivables 617,187 563,099 Prepaid territorial water use right ** 374,743 777,994 Prepayments for capacity quota 303,399 - Profit compensation from Huaneng Group (Note 40) 244,533 - Prepaid connection fees 120,486 108,365 Others 1,659,848 809,288 Total 7,696,845 4,321,945

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2017
Inventories [abstract]
Details of inventories	As at 31 December 2017 2016 Fuel (coal and oil) for power generation 5,684,824 5,391,068 Material and supplies 1,869,462 1,655,357 7,554,286 7,046,425 Less: provision for inventory obsolescence 168,875 167,282 Total 7,385,411 6,879,143
Movements of provision for inventory obsolescence during the years	2017 2016 2015 Beginning of the year (167,282 ) (162,389 ) (163,458 ) Provision (1,520 ) (1,134 ) (2,867 ) Reversal 1,782 1,390 1,039 Disposal of subsidiaries 162 - - Currency translation differences (2,017 ) (5,149 ) 2,897 End of the year (168,875 ) (167,282 ) (162,389 )

Other receivables and assets (T

Other receivables and assets (Tables)	12 Months Ended
	Dec. 31, 2017
Other receivables and assets [abstract]
Other receivables and assets	As at 31 December 2017 2016 Prepayments for inventories 387,335 252,389 Prepaid income tax 150,838 141,423 Prepayments for pre-construction cost - 885,051 Prepayments for capacity quota - 303,399 Others 181,913 121,810 Total prepayments 720,086 1,704,072 Less: provision for doubtful accounts 4,638 - Total prepayments, net 715,448 1,704,072 Dividends receivable 273,897 861,408 Receivables from sales of fuel 290,040 - Others 1,528,855 908,296 Subtotal other receivables 2,092,792 1,769,704 Less: provision for doubtful accounts 29,241 28,961 Total other receivables, net 2,063,551 1,740,743 Profit compensation from Huaneng Group (Note 40) 615,013 - VAT recoverable 2,607,505 2,008,955 Designated loan to a joint venture 80,000 80,000 Gross total 6,115,396 5,562,731 Net total 6,081,517 5,533,770
Gross amounts of other receivables denominated in currencies	As at 31 December 2017 2016 RMB 1,966,971 1,635,051 S$ (RMB equivalent) 76,529 95,816 US$ (RMB equivalent) 49,292 38,837 Total 2,092,792 1,769,704
Movements of other receivables provision for doubtful accounts	2017 2016 2015 Beginning of the year (28,961 ) (27,957 ) (29,644 ) Provision (5,890 ) (1,011 ) (9 ) Reversal/write-off 972 7 1,696 End of the year (33,879 ) (28,961 ) (27,957 )
Ageing analysis of other receivables fully recoverable	As at 31 December 2017 2016 Within 1 year 61,189 42,103 Between 1 to 2 years 1,360 2,683 Between 2 to 3 years 1,130 847 Over 3 years 76,376 67,476 Total 140,055 113,109
Ageing analysis of other receivables not expected to be recovered	As at 31 December 2017 2016 Within 1 year 7,535 752 Between 1 to 2 years 10 912 Between 2 to 3 years 463 285 Over 3 years 33,402 34,263 Total 41,410 36,212

Accounts receivable (Tables)

Accounts receivable (Tables)	12 Months Ended
	Dec. 31, 2017
Accounts receivable [abstract]
Accounts receivable	As at 31 December 2017 2016 Accounts receivable 21,948,753 14,050,096 Notes receivable 3,610,928 2,432,264 25,559,681 16,482,360 Less: provision for doubtful accounts 112,086 88,889 Total 25,447,595 16,393,471
Gross amounts of account receivables denominated in currencies	As at 31 December 2017 2016 RMB 24,633,465 15,586,989 S$ (RMB equivalent) 922,993 876,956 US$ (RMB equivalent) 3,223 18,415 Total 25,559,681 16,482,360
Movements of provision for doubtful accounts	2017 2016 2015 Beginning of the year (88,889 ) (2,054 ) (11,809 ) Provision (23,363 ) (88,818 ) (60 ) Reversal - 397 1,833 Write-off 167 1,682 - Transfer from a subsidiary to a joint venture - - 8,126 Currency translation differences (1 ) (96 ) (144 ) End of the year (112,086 ) (88,889 ) (2,054 )
Ageing analysis of accounts receivable	As at 31 December 2017 2016 Within 1 year 24,787,284 16,152,038 Between 1 to 2 years 576,564 279,694 Between 2 to 3 years 155,360 29,123 Over 3 years 40,473 21,505 Total 25,559,681 16,482,360
Ageing analysis of accounts receivable and notes receivable neither individually nor collectively impaired	As at 31 December 2017 2016 Neither past due nor impaired 24,936,171 16,063,215 Less than 1 year past due 267,845 248,597 Between 1 to 2 years past due 206,188 63,094 Between 2 to 3 years past due 27,130 17,944 Over 3 years past due 10,261 621 Total 25,447,595 16,393,471

Share capital (Tables)

Share capital (Tables)	12 Months Ended
	Dec. 31, 2017
Share capital [abstract]
Share capital	2017 201 6 Number of shares Share capital Number of shares Share capital RMB '000 RMB '000 As at 1 January and 31 December A shares 10,500,000,000 10,500,000 10,500,000,000 10,500,000 Overseas listed foreign shares 4,700,383,440 4,700,383 4,700,383,440 4,700,383 Total 15,200,383,440 15,200,383 15,200,383,440 15,200,383

Perpetual corporate bonds (Tabl

Perpetual corporate bonds (Tables)	12 Months Ended
	Dec. 31, 2017
Perpetual corporate bonds [abstract]
Perpetual corporate bonds	Type of Bonds Issuance Date Category Initial Annual Distribution Rates Issue Price Number Par Value Initial Period Conversion Condition Conversion Result RMB '000 RMB '000 Bond A September 2017 Equity Instrument 5.05% 0.1 25,000,000 2,500,000 3 Years None None Bond B September 2017 Equity Instrument 5.17% 0.1 25,000,000 2,500,000 5 years None None Total 5,000,000
Changes of perpetual corporate bonds	As at 1 January 2017 Issurance Cumulative Interests As at 31 December 2017 Type of Bonds Number Amount Number Amount Number Amount RMB '000 RMB '000 RMB '000 RMB '000 Bond A - - 25,000,000 2,499,975 33,897 25,000,000 2,533,872 Bond B - - 25,000,000 2,499,975 34,703 25,000,000 2,534,678 Total - - 50,000,000 4,999,950 68,600 50,000,000 5,068,550

Surplus reserves (Tables)

Surplus reserves (Tables)	12 Months Ended
	Dec. 31, 2017
Surplus reserves [abstract]
Surplus reserves	As at 1 January 2017 and 31 December 2017 Surplus reserves 8,140,030

Long-term loans (Tables)

Long-term loans (Tables)	12 Months Ended
	Dec. 31, 2017
Long-term loans [abstract]
Long-term loans	As at 31 December 2017 2016 Loans from Huaneng Group and its subsidiaries (a) 7,427,183 3,818,807 Bank loans and other loans (b) 117,702,233 70,732,439 125,129,416 74,551,246 Less: Current portion of long-term loans 18,098,458 9,560,885 Total 107,030,958 64,990,361
Loans from Huaneng Group and its subsidiaries (a)	As at 31 December 2017 Original currency RMB equivalent Less: Current portion Non current portion Annual interest rate 000 Loans from Huaneng Group Unsecured RMB - Variable rate 665,225 665,225 - 665,225 4.75 % Loans from Huaneng Finance Unsecured RMB - Variable rate 2,794,780 2,794,780 244,500 2,550,280 4.28%-4.66 % Loans from Huaneng Tiancheng Financial Leasing Co., Ltd. ("Tiancheng Financial Leasing") Secured RMB - Variable rate 3,967,178 3,967,178 1,878,994 2,088,184 4.06%-4.51 % Total 7,427,183 2,123,494 5,303,689 As at 31 December 2016 Original currency RMB equivalent Less: Current portion Non current portion Annual interest rate 000 Loans from Huaneng Group Unsecured RMB - Variable rate 665,015 665,015 640,485 24,530 4.75 % Loans from HIPDC Unsecured RMB - Variable rate 210 210 - 210 4.75 % Loans from Huaneng Finance Unsecured RMB - Variable rate 286,000 286,000 60,000 226,000 4.41%-4.75 % Loans from Huaneng Tiancheng Financial Leasing Secured RMB - Variable rate 2,867,582 2,867,582 154,737 2,712,845 4.42 % Total 3,818,807 855,222 2,963,585
Bank loans and other loans (b)	As at 31 December 2017 Original currency RMB equivalent Less: Current portion Non current portion Annual interest rate 000 Secured RMB - Fixed rate 7,080,379 7,080,379 1,213,150 5,867,229 4.41%-4.90% - Variable rate 4,117,055 4,117,055 657,231 3,459,824 4.66%-4.90% Unsecured RMB - Fixed rate 14,981,859 14,981,859 3,179,426 11,802,433 2.00%-5.00% - Variable rate 76,467,082 76,467,082 10,013,829 66,453,253 1.80%-6.03% US$ - Variable rate 347,676 2,271,785 418,163 1,853,622 1.74%/2.26% S$ - Variable rate 2,538,619 12,396,329 419,570 11,976,759 2.73%/4.25% € - Fixed rate 30,463 237,680 67,207 170,473 1.30%-2.15% JPY - Fixed rate 2,592,661 150,064 6,388 143,676 0.75% Total 117,702,233 15,974,964 101,727,269 As at 31 December 2016 Original currency RMB equivalent Less: Current portion Non current portion Annual interest rate 000 Secured RMB - Fixed rate 8,305,310 8,305,310 1,202,430 7,102,880 4.41%-4.90% - Variable rate 760,500 760,500 56,800 703,700 4.66%-4.90% Unsecured RMB - Fixed rate 15,896,017 15,896,017 2,515,343 13,380,674 2.65%-5.00% - Variable rate 30,095,494 30,095,494 4,270,910 25,824,584 4.17%-5.65% US$ - Variable rate 409,760 2,842,505 388,925 2,453,580 1.92% S$ - Variable rate 2,580,522 12,385,213 196,410 12,188,803 2.76%/4.25% € - Fixed rate 39,187 286,329 68,271 218,058 2.00%/2.15% JPY - Fixed rate 2,702,533 161,071 6,574 154,497 0.75% Total 70,732,439 8,705,663 62,026,776
Maturity of long-term loans	Loans from Huaneng Group and its subsidiaries Bank loans and other loans As at 31 December As at 31 December 2017 2016 2017 2016 RMB '000 RMB '000 1 year or less 2,123,494 855,222 15,974,964 8,705,663 More than 1 year but no more than 2 years 1,689,582 715,400 19,039,483 11,420,746 More than 2 years but no more than 3 years 1,281,082 953,082 18,624,576 11,081,242 More than 3 years but no more than 4 years 294,020 928,082 16,388,976 7,769,955 More than 4 years but no more than 5 years 728,225 232,021 11,927,930 7,618,953 More than 5 years 1,310,780 135,000 35,746,304 24,135,880 7,427,183 3,818,807 117,702,233 70,732,439 Less: amount due within 1 year included under current liabilities 2,123,494 855,222 15,974,964 8,705,663 Total 5,303,689 2,963,585 101,727,269 62,026,776
Interest payment schedule of long-term loans in future years	As at 31 December 2017 2016 1 year or less 5,071,743 2,987,045 More than 1 year but not more than 2 years 4,225,736 2,577,363 More than 2 years but not more than 5 years 7,903,397 4,912,222 More than 5 years 4,864,084 3,133,578 Total 22,064,960 13,610,208

Other non-current liabilities (

Other non-current liabilities (Tables)	12 Months Ended
	Dec. 31, 2017
Other non-current liabilities [abstract]
Other non-current liabilities	As at 31 December 2017 2016 Finance lease payables(a) 1,600,106 1,088,846 Government grants -Environmental subsidies(b) 1,245,810 1,122,406 -Other government grants 179,226 174,216 Other deferred income 1,825,614 379,615 Others 969,052 870,597 Subtotal 5,819,808 3,635,680 Current portion of finance lease payables (470,985 ) (568,645 ) Current portion of other non-current liabilities (64,361 ) (247,537 ) Subtotal (535,346 ) (816,182 ) Total 5,284,462 2,819,498
Obligation under finance leases	As at 31 December 2017 2016 Within 1 year 500,790 605,806 After 1 year but within 2 years 312,125 266,792 After 2 years but within 3 years 281,990 82,470 After 3 years 674,256 181,345 1,769,161 1,136,413 Less: total future interest expense 169,055 47,567 Total 1,600,106 1,088,846

Accounts payable and other li71

Accounts payable and other liabilities (Tables)	12 Months Ended
	Dec. 31, 2017
Accounts payable and other liabilities [abstract]
Accounts payable and other liabilities	As at 31 December 2017 2016 Accounts and notes payable 15,496,475 12,059,004 Payables to contractors for construction 14,491,632 10,832,444 Retention payables to contractors 2,008,106 1,445,383 Amounts received in advance 1,504,926 365,887 Accrued interests 947,302 676,462 Others 4,451,691 3,367,437 Total 38,900,132 28,746,617
Carrying amounts of financial liabilities denominated in currencies	As at 31 December 2017 2016 RMB 36,399,243 27,222,632 S$ (RMB equivalent) 556,881 669,797 US$ (RMB equivalent) 436,358 479,179 JPY (RMB equivalent) 2,469 6,917 EUR (RMB equivalent) 255 2,205 Total 37,395,206 28,380,730
Ageing analysis of accounts and notes payable	As at 31 December 2017 2016 Within 1 year 15,201,380 11,902,522 Between 1 to 2 years 196,082 100,092 Over 2 years 99,013 56,390 Total 15,496,475 12,059,004

Taxes payable (Tables)

Taxes payable (Tables)	12 Months Ended
	Dec. 31, 2017
Taxes payable [abstract]
Taxes payable	As at 31 December 2017 2016 VAT payable 619,329 439,304 Income tax payable 430,703 440,791 Others 252,178 209,010 Total 1,302,210 1,089,105

Short-term loans (Tables)

Short-term loans (Tables)	12 Months Ended
	Dec. 31, 2017
Short-term loans [abstract]
Short-term loans	As at 31 December 2017 As at 31 December 2016 Original currency RMB equivalent Annual interest rate Original currency RMB equivalent Annual interest rate '000 '000 Secured RMB - Fixed rate 24,000 24,000 4.71%-5.50 % 13,500 13,500 3.00 % - Variable rate - - 112,034 112,034 2.77%-3.80 % Unsecured RMB - Fixed rate 10,450,248 10,450,248 3.92%-4.35 % 3,319,947 3,319,947 3.70%-4.35 % - Variable rate 69,777,100 69,777,100 3.74%-4.35 % 54,223,393 54,223,393 3.57%-4.35 % Total 80,251,348 57,668,874

Deferred income tax assets an74

Deferred income tax assets and liabilities (Tables)	12 Months Ended
	Dec. 31, 2017
Deferred income tax assets and liabilities [abstract]
Deferred income tax assets and liabilities	As at 31 December 2017 2016 Deferred income tax assets before offsetting 3,604,577 2,432,552 Offset amount (1,304,486 ) (1,168,595 ) Deferred income tax assets after offsetting 2,300,091 1,263,957 Deferred income tax liabilities before offsetting (5,871,166 ) (3,431,347 ) Offset amount 1,304,486 1,168,595 Deferred income tax liabilities after offsetting (4,566,680 ) (2,262,752 ) (2,266,589 ) (998,795 )
Gross movement on deferred income tax accounts	2017 2016 2015 Beginning of the year (998,795 ) (1,429,752 ) (926,481 ) Business combination (Note 40) (2,322,513 ) (58,929 ) (1,007,147 ) Disposal of subsidiaries (Note 6) 17,407 - - Credited to profit or loss (Note 33) 724,712 440,817 687,206 Charged to other comprehensive income 330,834 87,775 (198,525 ) Currency translation differences (18,234 ) (38,706 ) 15,195 End of the year (2,266,589 ) (998,795 ) (1,429,752 )
Movements in deferred income tax assets without taking into consideration the offsetting	Hedging reserve Amortization of land use rights Provision for impairment loss Depreciation Accrued expenses VAT refunds on purchases of domestically manufactured equipment Unused tax losses Others Total As at 1 January 2016 199,876 14,417 399,418 572,379 40,938 230,442 235,984 696,403 2,389,857 Business combination - - 66,560 6,840 - - - - 73,400 (Charged)/credited to profit or loss - (502 ) 140,969 (41,015 ) 1,185 (25,433 ) (5,128 ) 71,610 141,686 Charged to other comprehensive income (182,400 ) - - - - - - - (182,400 ) Currency translation differences - - 207 - - - 132 9,670 10,009 As at 31 December 2016 17,476 13,915 607,154 538,204 42,123 205,009 230,988 777,683 2,432,552 Business combination(Note 40) - - - 574,600 5,052 - 139,387 414,891 1,133,930 Disposal of subsidiaries(Note 6) - - (10,686 ) (9,962 ) - - (5,566 ) (52,270 ) (78,484 ) (Charged)/credited to profit or loss - (493 ) (2,593 ) (70,209 ) 7,076 (25,433 ) 196,613 20,026 124,987 Charged to other comprehensive income (11,905 ) - - - - - - - (11,905 ) Currency translation differences - - 82 - - - - 3,415 3,497 As at 31 December 2017 5,571 13,422 593,957 1,032,633 54,251 179,576 561,422 1,163,745 3,604,577
Movements in deferred income tax liabilities without taking into consideration the offsetting	Hedging reserve Fair value gains Amortization of land use rights Depreciation Power generation license Mining rights Territorial water use right Others Total As at 1 January 2016 - (645,242 ) (904,173 ) (1,291,706 ) (625,460 ) (157,215 ) (74,201 ) (121,612 ) (3,819,609 ) Business combination - - (10,423 ) - - - - (121,906 ) (132,329 ) Credited to profit or loss - - 24,948 169,088 - 27,832 1,769 75,494 299,131 (Charged)/credited to other comprehensive loss (26,530 ) 296,705 - - - - - - 270,175 Currency translation differences 8,131 - (1,507 ) (26,436 ) (28,903 ) - - - (48,715 ) As at 31 December 2016 (18,399 ) (348,537 ) (891,155 ) (1,149,054 ) (654,363 ) (129,383 ) (72,432 ) (168,024 ) (3,431,347 ) Business combination (Note 40) - (1,736 ) (148,129 ) (3,209,672 ) - - - (96,906 ) (3,456,443 ) Disposal of subsidiaries(Note 6) - - 1,761 22,162 - - 68,696 3,272 95,891 Credited to profit or loss - - 27,457 525,780 - - 1,327 45,161 599,725 (Charged)/credited to other comprehensive loss (5,558 ) 348,297 - - - - - - 342,739 Currency translation differences (304 ) - (540 ) (9,490 ) (11,397 ) - - - (21,731 ) As at 31 December 2017 (24,261 ) (1,976 ) (1,010,606 ) (3,820,274 ) (665,760 ) (129,383 ) (2,409 ) (216,497 ) (5,871,166 )
Unrecognized deferred income tax assets in respect of certain deductible temporary differences and accumulated tax losses	As at 31 December 2017 2016 Deductible temporary differences 4,672,788 2,957,316 Unused tax losses 8,665,079 6,669,820 Total 13,337,867 9,627,136
Summary of expiry dates of the tax losses for which no deferred income tax assets were recognized	As at 31 December 2017 2016 Year of expiry 2017 - 1,841,365 2018 1,557,045 1,122,070 2019 1,579,066 1,195,811 2020 1,524,531 1,061,468 2021 1,558,573 1,449,106 2022 2,445,864 - Total 8,665,079 6,669,820

Income tax expense (Tables)

Income tax expense (Tables)	12 Months Ended
	Dec. 31, 2017
Income tax expense [abstract]
Income tax expense	For the year ended 31 December 2017 2016 2015 Current income tax expense 1,942,238 3,905,968 6,386,149 Deferred income tax (Note 31) (724,712 ) (440,817 ) (687,206 ) Total 1,217,526 3,465,151 5,698,943
Reconciliation of effective income tax rate from notional income tax rate	For the year ended 31 December 2017 2016 2015 Notional tax on profit before income tax expense, calculated at the applicable income tax rates in the countries concerned 26.13 % 25.16 % 25.11 % Effect of tax losses not recognized 18.45 % 1.58 % (0.12 %) Effect of deductible temporary differences not recognized 6.04 % (0.20 %) (0.16 %) Effect of non-taxable income (12.37 %) (2.89 %) (1.77 %) Effect of non-deductible expenses 7.05 % 1.09 % 1.37 % Others (1.84 %) 0.35 % 0.39 % Effective tax rate 43.46 % 25.09 % 24.82 %

Earnings per share (Tables)

Earnings per share (Tables)	12 Months Ended
	Dec. 31, 2017
Earnings per share [abstract]
Earnings per share	2017 2016 2015 Consolidated net profit attributable to equity holders of the Company 1,579,836 8,520,427 13,651,933 Less: cumulative distribution of perpetual corporate bonds 68,600 - - Consolidated net profit attributable to ordinary Shareholders of the Company 1,511,236 8,520,427 13,651,933 Weighted average number of the Company's outstanding ordinary shares ('000) 15,200,383 15,200,383 14,485,383 Basic and diluted earnings per share (RMB) 0.10 0.56 0.94
Weighted average number of ordinary shares	2017 2016 2015 '000 '000 '000 Issued ordinary shares at 1 January 15,200,383 15,200,383 14,420,383 Effect of share issue - - 65,000 Weighted average number of ordinary shares at 31 December 15,200,383 15,200,383 14,485,383

Notes to consolidated stateme77

Notes to consolidated statement of cash flows (Tables)	12 Months Ended
	Dec. 31, 2017
Consolidated Statements of Cash Flows [abstract]
Bank balances and cash	As at 31 December 2017 2016 2015 Total bank balances and cash 9,364,823 7,881,630 7,537,813 Less: Restricted cash 82,433 71,129 59,563 Cash and cash equivalents as at year end 9,282,390 7,810,501 7,478,250
Bank balances and cash denominated in currencies	As at 31 December 2017 2016 2015 RMB 8,213,100 6,691,911 5,847,363 S$ (RMB equivalent) 835,995 869,591 1,130,356 US$ (RMB equivalent) 315,535 319,944 559,761 JPY (RMB equivalent) 193 184 205 HK$ (RMB equivalent) - - 128 Total 9,364,823 7,881,630 7,537,813
Changes in the group's liabilities from financing activities	Items Loans Bonds Accrued interests Finance leases payables Interest rate swaps contracts (liabilities) As at 1 January 2017 132,220,120 42,788,810 676,462 1,088,846 169,201 (a) Business combination 47,562,251 - 85,380 521,083 - (b) Changes from financing cash flows: Proceeds from new bank loans 140,270,455 - - - - Repayment of bank loans (113,769,036 ) - - - - Proceeds from new bonds - 38,788,679 - - - Repayment of bonds - (50,300,000 ) - - - Capital element of finance lease rentals paid - - - (636,145 ) - Interest element of finance lease rentals paid - - - (58,874 ) - Interest paid - (885,000 ) (9,195,102 ) - - Others (3,135 ) (80,643 ) - - - (c) Exchange adjustments 82,298 - 2,095 235 - (d) Changes in fair value - - - - (38,558 ) (e) Other changes: New finance leases - - - 659,895 - Interest expenses - 747,377 8,902,402 99,225 - Capitalised borrowing costs - - 476,065 - - Disposal of subsidiaries (1,166,899 ) - - - - Others 184,710 - - (74,159 ) - As at 31 December 2017 205,380,764 31,059,223 947,302 1,600,106 130,643

Related party balances and tr78

Related party balances and transactions (Tables)	12 Months Ended
	Dec. 31, 2017
Related party balances and transactions [abstract]
Transactions between related parties	Names of related parties Nature of relationship Huaneng Group Ultimate parent company HIPDC Parent company Huaneng Energy & Communications Holdings Co., Ltd. and its subsidiaries Subsidiaries of Huaneng Group* Huaneng Property Co., Ltd. and its subsidiaries Subsidiaries of Huaneng Group Xi'an Thermal and its subsidiaries Subsidiaries of Huaneng Group Huaneng Group Technology Innovation Center A subsidiary of Huaneng Group Huaneng Hulunbuir Energy Development Company Ltd.and its subsidiaries Subsidiaries of Huaneng Group Alltrust Insurance Co., Ltd. A subsidiary of Huaneng Group North United Power Co., Ltd. and its subsidiaries Subsidiaries of Huaneng Group Huaneng Group Clean Energy Technology Research Institute Co., Ltd. A subsidiary of Huaneng Group Huaneng Renewables Corporation Limited and its subsidiaries Subsidiaries of Huaneng Group Huaneng Carbon Assets Management Company Limited A subsidiary of Huaneng Group Huaneng Group Hong Kong Limited A subsidiary of Huaneng Group Huaneng Lancangjiang Hydropower Co., Inc. and its subsidiaries Subsidiaries of Huaneng Group Changping Huaneng Training Center A subsidiary of Huaneng Group Huaneng Hainan Industry Co.,Ltd. A subsidiary of Huaneng Group Huaneng Baishan Coal Gangue Power Generation Co., Ltd. A subsidiary of Huaneng Group Great Wall Securities Co., Ltd. ("Great Wall Securities") A subsidiary of Huaneng Group Huaneng Nuclear Power Development Company Ltd. A subsidiary of Huaneng Group Huaneng Tibet Yarlung Zangbo River Hydropower Development & Investment Company Ltd. and its subsidiaries Subsidiaries of Huaneng Group Huaneng Xining Power Co., Ltd. A subsidiary of Huaneng Group Huaneng Coal Business Sector Co., Ltd. and its subsidiaries Subsidiaries of Huaneng Group Huaneng Integrated Industries Co., Ltd. A subsidiary of Huaneng Group Huaneng Ningxia Energy Company Ltd. A subsidiary of Huaneng Group Huaneng Shaanxi Power Generation Limited and its subsidiaries Subsidiaries of Huaneng Group Huaneng Xinjiang Energy Development Company Ltd. and its subsidiaries Subsidiaries of Huaneng Group Huaneng Gansu Energy Development Company Ltd. and its subsidiaries Subsidiaries of Huaneng Group Huaneng Capital Services Co., Ltd. A subsidiary of Huaneng Group Huaneng Shaanxi Qinling Power Generation Co., Ltd. A subsidiary of Huaneng Group Ningxia Daba Power Generation Co., Ltd. A subsidiary of Huaneng Group Huaneng Shandong Shidao Bay Nuclear Power Co., Ltd. A subsidiary of Huaneng Group Huangtai #8 Power Plant An investee with significant influence Shanghai Time Shipping A joint venture of the Company Jiangsu Nantong Power A joint venture of the Company Huaneng Yingkou Port Limited Liability Company A joint venture of the Company Luyi Power A joint venture of the Company Ruyi (Hong Kong) Energy and its subsidiaries Joint ventures of the Company Suzhou Sugao Renewables Service Co. Ltd. A joint venture of the Company Liaocheng Luxi Fuel Co., Ltd.Company An associate of the Company Zhengzhou Airport Xinggang Power Co., Ltd. An associate of the Company Names of related parties Nature of relationship Chongqing Huaneng Lime Company Limited An associate of the Company Hainan Nuclear An associate of the Company Sichuan Hydropower An associate of the Company and also a subsidiary of Huaneng Group Hanfeng Power An associate of the Company and also a subsidiary of Huaneng Group Tiancheng Financial Leasing An associate of the Company and also a subsidiary of Huaneng Group Huaneng Shidao Bay Nuclear Power Development Co., Ltd. An associate of the Company and also a subsidiary of Huaneng Group Xiapu Nuclear Power Co., Ltd. An associate of the Company and also a subsidiary of Huaneng Group Huaneng Finance An associate of the Company and also a subsidiary of Huaneng Group Huaneng (Tianjing) Coal Gasification Power Generation Co., Ltd. An associate of the Company and also a subsidiary of Huaneng Group Huaneng Group Fuel Company and its subsidiaries Associates of the Company and also subsidiaries of Huaneng Group Other government-related enterprises** Related parties of the Company
Cash deposits in related parties	As at 31 December 2017 2016 Deposits in Huaneng Finance - Savings deposit 7,506,706 5,155,000 Deposits in Great Wall Securities - Savings deposit - 2 Total 7,506,706 5,155,002
Balances of accounts receivable, other receivables and assets due from related parties	As at 31 December 2017 2016 Due from Huaneng Group 860,941 708 Due from HIPDC 99 - Due from joint ventures 360,442 806,112 Due from associates 89,083 - Due from subsidiaries of Huaneng Group 196,621 319,224 Due from Huangtai #8 Power Plant 903,671 - Total 2,410,857 1,126,044
Balances of accounts payable and other liabilities and other non-current liabilities due to related parties	As at 31 December 2017 2016 Due to Huaneng Group 260,306 12,232 Due to HIPDC 16,138 14,183 Due to joint ventures 336,170 325,590 Due to associates 5,751 263,154 Due to subsidiaries of Huaneng Group 4,239,688 4,145,595 Total 4,858,053 4,760,754
Related party transactions, procurement of goods and receiving services	For the year ended 31 December 2017 2016 2015 Huaneng Group Technical services and engineering contracting services - - 50 Other purchases 446 451 - Subsidiaries of Huaneng Group Purchase of coal and transportation services 19,945,752 17,212,984 16,575,700 Technical services and engineering contracting services 1,024,369 1,055,251 769,176 Purchase of equipment 347,163 483,058 302,387 Purchase of power generation quota - 195,528 287,779 Other purchases 716 6,472 7,073 Joint ventures of the Company Purchase of coal and transportation services 2,054,209 2,150,844 1,816,954 Entrusting other parties for power generation 28,953 - - An associate of the Company Other purchases 27,732 43,808 44,591
Related party transactions, sales of goods and providing services	For the year ended 31 December 2017 2016 2015 Huaneng Group Service provided 907 - - HIPDC Service provided 520 - - Subsidiaries of Huaneng Group Sales of power generation quota - 1,165 135,085 Sales of goods 1,114,347 - - Other sales 15,247 189,914 40,780 Service provided 25,229 31,135 50,627 Provision of entrusted power generation 58,639 - - Joint ventures of the Company Service provided 319,844 59,049 133,332 Other sales 407,697 9,490 23,003 Other related party Provision of entrusted power generation - - 33,129
Related party transactions, other related party transactions	For the year ended 31 December 2017 2016 2015 (1 ) Rental charge on leasehold HIPDC 106,885 157,264 161,941 Subsidiaries of Huaneng Group 141,542 128,932 130,591 A joint venture of the Company 2,128 - - (2 ) Rental income from leasehold A joint venture of the Company 7,448 7,750 10,759 Subsidiaries of Huaneng Group 2,509 5,724 9,115 (3 ) Drawdown of loans Subsidiaries of Huaneng Group 15,374,480 4,035,000 2,660,500 HIPDC - 210 - Huaneng group 665,225 - - (4 ) Interest expense on loans Huaneng group 33,481 30,514 32,573 HIPDC 10 13,136 114,687 Subsidiaries of Huaneng Group 589,012 217,098 158,695 (5 ) Interest income on loans A joint venture of the Company 3,329 3,488 4,572 An associate of the Company 917 - - A Subsidiary of Huaneng Group 4,344 - - For the year ended 31 December 2017 2016 2015 (6 ) Capital injection from a subsidiary of Huaneng Group A subsidiary of Huaneng Group 274,752 - 286,312 (7 ) Capital injection A subsidiary of Huaneng Group - 157,500 683,550 An associate of the Company 52,200 100,418 206,230 Joint ventures of the Company 249,716 18,200 - (8 ) Pre-construction cost paid by A subsidiary of Huaneng Group 23,529 765 12,254 An joint venture of the Company 179 - (9 ) Finance lease payments received from A subsidiary of Huaneng Group - 2,960,000 100,000 (10 ) Entrusted management fee Huaneng Group 13,453 24,950 24,950 (11 ) Trusteeship management income Huaneng Group 1,518 1,700 1,700 (12 ) Net proceeds received from investee with significant influence Huangtai #8 Power Plant 72,920 - - (13 ) Finance lease to investee with significant influence Huangtai #8 Power Plant 86,946 - - (14 ) Interest income from finance lease Huangtai #8 Power Plant 11,626 - - (15 ) Acquisition consideration In 2017, the Company acquired subsidiaries from Huaneng Group, please refer to Note 40(a) for details of the acquisition consideration. (16 ) Disposal subsidiaries In 2017, the Company disposed Taishan Power Limited Company to a subsidiary of Huaneng Group, please refer to Note 6 for details.
Guarantees	As at 31 December 2017 2016 (i ) Long-term loans guaranteed by - Huaneng Group 1,675,147 565,992 - HIPDC 2,099,600 2,142,000 (ii ) Long-term bonds guaranteed by - HIPDC 4,000,000 4,000,000 - Government-related banks - 3,300,000
Pre-tax benefits and social insurance of key management personnel	For the year ended 31 December 2017 2016 2015 Salaries 7,676 8,225 9,064 Pension 1,511 1,521 1,470 Total 9,187 9,746 10,534
Related party capital commitments	As at 31 December 2017 2016 Subsidiaries of Huaneng Group 290,041 439,571
Related party fuel purchase and transportation commitments	As at 31 December 2017 2016 Subsidiaries of Huaneng Group 1,111,649 963,306 A joint venture of the Company 279,408 291,032 Total 1,391,057 1,254,338
Related party operating lease commitments	As at 31 December 2017 2016 Subsidiaries of Huaneng Group 171,804 286,340 HIPDC 76,202 65,554 Total 248,006 351,894

Directors', supervisors' and 79

Directors', supervisors' and senior management's emoluments (Tables)	12 Months Ended
	Dec. 31, 2017
Directors', supervisors' and senior management's emoluments [abstract]
Pre-tax benefits and social insurance of directors and supervisors	The remuneration of every director and supervisor of the Company for the year ended 31 December 2017 is set out below: Fees Basic salaries Performance salaries Pension Total Name of director Mr. Cao Peixi - - - - - Mr. Guo Junming 1 - - - - - Mr. Liu Guoyue - - - - - Mr. Fan Xiaxia 2 - - - - - Mr. Li Shiqi 3 - - - - - Mr. Huang Jian - - - - - Mr. Wang Yongxiang 4 - - - - - Mr. Mi Dabin 24 - - - 24 Mr. Guo Hongbo - - - - - Mr. Zhu Yousheng 3 24 - - - 24 Ms. Li Song 3 24 - - - 24 Mr. Cheng Heng 4 - - - - - Mr. Lin Chong 4 - - - - - Mr. Li Zhensheng 3 37 - - - 37 Mr. Yue Heng 74 - - - 74 Mr. Geng Jianxin 3 37 - - - 37 Mr. Xia Qing 3 37 - - - 37 Mr. Xu Mengzhou 74 - - - 74 Mr. Liu Jizhen 4 37 - - - 37 Mr. Xu Haifeng 4 37 - - - 37 Mr. Zhang Xianzhi 4 37 - - - 37 Sub-total 442 - - - 442 Name of supervisor Mr. Ye Xiangdong - - - - - Mr. Mu Xuan 24 - - - 24 Ms. Zhang Mengjiao - - - - - Mr. Gu Jianguo 24 - - - 24 Ms. Zhang Xiaojun - 137 466 124 727 Mr. Zhu Daqing - 135 464 123 722 Sub-total 48 272 930 247 1,497 Total 490 272 930 247 1,939 The remuneration of every director and supervisor of the Company for the year ended 31 December 2016 is set out below: Fees Basic salaries Performance salaries Pension Total Name of director Mr. Cao Peixi - - - - - Mr. Guo Junming - - - - - Mr. Liu Guoyue - - - - - Mr. Li Shiqi - - - - - Mr. Huang Jian - - - - - Mr. Fan Xiaxia - 327 396 122 845 Mr. Mi Dabin 48 - - - 48 Mr. Guo Hongbo - - - - - Mr. Zhu Yousheng 48 - - - 48 Ms. Li Song 48 - - - 48 Mr. Li Zhensheng 74 - - - 74 Mr. Zhang Shouwen 37 - - - 37 Mr. Yue Heng 74 - - - 74 Mr. Geng Jianxin 74 - - - 74 Mr. Xia Qing 74 - - - 74 Mr. Xu Mengzhou 37 - - - 37 Sub-total 514 327 396 122 1,359 Name of supervisor Mr. Ye Xiangdong - - - - - Mr. Mu Xuan 48 - - - 48 Ms. Zhang Mengjiao - - - - - Mr. Gu Jianguo 48 - - - 48 Mr. Wang Zhaobin - 51 - - 51 Ms. Zhang Ling - 69 - - 69 Ms. Zhang Xiaojun - 92 314 89 495 Mr. Zhu Daqing - 90 313 88 491 Sub-total 96 302 627 177 1,202 Total 610 629 1,023 299 2,561 The remuneration of every director and supervisor of the Company for the year ended 31 December 2015 is set out below: Fees Basic salaries Performance salaries Pension Total Name of director Mr. Cao Peixi - - - - - Mr. Guo Junming - - - - - Mr. Liu Guoyue - 143 663 123 929 Mr. Li Shiqi - - - - - Mr. Huang Jian - - - - - Mr. Fan Xiaxia - 356 494 131 981 Mr. Mi Dabin 65 - - - 65 Mr. Guo Hongbo 12 - - - 12 Mr. Zhu Yousheng 24 - - - 24 Mr. Xu Zujian 24 - - - 24 Ms. Li Song 65 - - - 65 Mr. Li Zhensheng 74 - - - 74 Mr. Qi Yudong 6 - - - 6 Mr. Zhang Shouwen 74 - - - 74 Mr. Yue Heng 100 - - - 100 Ms. Zhang Lizi 30 - - - 30 Mr. Geng Jianxin 37 - - - 37 Mr. Xia Qing 37 - - - 37 Sub-total 548 499 1,157 254 2,458 Name of supervisor Mr. Ye Xiangdong - - - - - Mr. Mu Xuan 65 - - - 65 Ms. Zhang Mengjiao - - - - - Mr. Gu Jianguo 49 - - - 49 Mr. Wang Zhaobin - 298 385 103 786 Ms. Zhang Ling - 133 263 53 449 Sub-total 114 431 648 156 1,349 Total 662 930 1,805 410 3,807
Five highest paid individuals	As at 31 December 2017 2016 2015 Basic salaries 1,524 1,213 910 Performance salaries 1,800 1,440 1,260 Pension 648 502 365 3,972 3,155 2,535

Commitments (Tables)

Commitments (Tables)	12 Months Ended
	Dec. 31, 2017
Commitments [abstract]
Capital commitments	As at 31 December 2017 2016 Contracted but not provided 16,985,439 18,603,559
Total future minimum lease payments under non-cancelable operating leases	As at 31 December 2017 2016 Land and buildings - not later than 1 year 196,870 181,441 - later than 1 year and not later than 2 years 118,272 144,088 - later than 2 years and not later than 5 years 143,628 133,984 - later than 5 years 1,028,014 970,896 Total 1,486,784 1,430,409
Fuel purchase commitments	As at 31 December 2017 Periods Purchase quantities Estimated unit costs (RMB) A government-related enterprise 2018-2039 2.8 million m 3 2.21/ m 3 A government-related enterprise 2018-2023 541 million m 3 2.06/ m 3 2018-2023 450 million m 3 2.06/ m 3 2018-2023 541 million m 3 2.10/ m 3 2018-2023 450 million m 3 2.27/ m 3 A government-related enterprise 2018-2026 200 million m 3 2.38/ m 3 Other suppliers 2018-2019 243 BBtu**/day approximately 67,000/BBtu 2020-2021 242 BBtu**/day approximately 67,000/BBtu 2022 248 BBtu**/day approximately 67,000/BBtu 2023 247.5~256.6BBtu**/day approximately 67,000/BBtu 2024-2028 49.9-81.5BBtu**/day approximately 69,000/BBtu As at 31 December 2016 Periods Purchase quantities Estimated unit costs (RMB) A government-related enterprise 2017-2039 2.8 million m 3 2.31/ m 3 A government-related enterprise 2017-2023 541 million m 3 2.16/ m 3 2017-2023 450 million m 3 2.16/ m 3 Other suppliers 2017-2022 248BBtu**/day approximately 63,000/BBtu 2023 247.5-256.6BBtu**/day approximately 63,000/BBtu 2024-2028 49.9-59.0BBtu**/day approximately 70,000/BBtu

Business combinations (Tables)

Business combinations (Tables)	12 Months Ended
	Dec. 31, 2017
Business combinations [abstract]
Consideration for acquisition from Huaneng Group	Acquisition Date Total consideration 15,500,770 Non-controlling interests 6,292,577 Fair value of pre-existing interest in a subsidiary of Shandong Power 690,967 Less: Fair value of total identifiable net assets 19,316,748 Goodwill 3,167,566 Total consideration 15,500,770 Less: Net settlement of the receivables due from Huaneng Group 2,361,871 Bank balances and cash of acquirees 2,342,766 Less: Restricted cash (20,974 ) Cash consideration paid for acquisition of subsidiaries, net of cash acquired 10,817,107
Assets and liabilities arising from the acquisitions from Huaneng Group	Shandong Power (consolidated) Fair value Jilin Power (consolidated) Fair value Heilongjiang Power (consolidated) Fair value Zhongyuan Gas Fair value Property, plant and equipment 41,366,757 8,496,028 12,525,071 1,381,060 Investment in associates and joint ventures 1,021,566 - - - Available-for-sale financial assets 4,000 100,895 - - Land use rights 2,272,181 228,173 655,485 27,075 Deferred income tax assets 334,055 323,522 10,404 - Other non-current assets 1,285,838 213,589 210,965 48 Bank balances and cash 1,621,276 103,045 385,295 222,939 Inventories 952,510 89,333 123,889 1,136 Trade receivables 2,509,641 293,455 127,219 124,636 Other receivables and other current assets 2,992,094 2,393,835 889,392 119,974 Long-term borrowings (15,647,367) (8,330,929) (6,742,580) (1,200,000) Deferred income tax liabilities (2,447,672) (214,642) (280,945) (47,235) Other non-current liabilities (1,688,306) (10,291) (253,671) - Short-term borrowings (8,082,200) (600,000) (1,920,000) - Tax payables (270,531) (10,311) (54,302) (419) Dividends payables (136,955) - - - Salary and welfare payables (41,667) (2,969) (22,462) (717) Payables and other liabilities (9,725,591) (2,668,626) (3,083,130) (606,115) Total identifiable net assets 16,319,629 404,107 2,570,630 22,382
Acquisition information of transfers from joint ventures to subsidiaries	Acquisition Date Non-controlling interests 10 Fair value of pre-existing interest in Shanxi Xiaoyi Energy 10,200 Less: Fair value of total identifiable net assets 10,210 Goodwill -
Financial information of acquirees from acquisition due to transfers from joint ventures to subsidiaries	From acquisition date to 31 December 2017 acquiree's Revenue Net Profit Shanxi Xiaoyi Energy 704 228
Identifiable assets and liabilities of acquirees as at the acquisition date due to transfers from joint ventures to subsidiaries	Fair Value Bank balances and cash 10,211 Accounts payable and other liabilities (1 ) Total identifiable net assets 10,210
Consideration for acquisition of Ruzhou Xuji Wind Power Generation Co., Ltd.	Acquisition Date Consideration 4,000 Less: Fair value of total identifiable net assets 4,000 Goodwill -
Financial information of acquirees from acquisition not under common control	From acquisition date to 31 December 2017 acquiree's Revenue Net Profit Xuji Wind Power - -
Identifiable assets and liabilities of acquirees as at the acquisition date not under common control	Fair Value Other receivables and assets 16,080 Property, plant and equipment 11,893 Accounts payable and other liabilities (23,973 ) Total identifiable net assets 4,000

Non-controlling interests (Tabl

Non-controlling interests (Tables)	12 Months Ended
	Dec. 31, 2017
Non-controlling interests [abstract]
Information relating to each of the Company and subsidiaries that have material non-controlling interests ("NCI")	Qinbei Power Beijing Cogeneration Luohuang Power Weihai Power Jinling Power Yueyang Power Shidongkou Power Yangliuqing Cogeneration Shandong Power Other individually immaterial subsidiaries Total NCI percentage 40% 59% 40% 40% 40% 45% 50% 45% 20% 31 December 2017 Non-current assets 10,553,775 6,841,918 4,055,507 4,664,868 5,049,079 4,875,004 3,712,623 2,541,803 47,665,952 Current assets 1,738,000 1,257,485 887,225 633,012 494,312 987,812 494,073 497,441 6,891,086 Non-current liabilities (3,053,535 ) (394,590 ) (242,944 ) (81,048 ) (1,541,444 ) (1,042,093 ) (731,640 ) (205,205 ) (19,681,891 ) Current liabilities (5,821,543 ) (2,501,516 ) (2,064,897 ) (2,462,363 ) (1,854,441 ) (2,590,470 ) (1,919,701 ) (869,071 ) (18,695,005 ) Net assets 3,416,697 5,203,297 2,634,891 2,754,469 2,147,506 2,230,253 1,555,355 1,964,968 16,180,142 Carrying amount of NCI 1,380,594 3,050,283 1,032,938 1,101,787 859,024 1,019,016 777,678 883,340 4,697,283 5,171,095 19,973,038 Revenue 4,587,612 4,262,547 2,303,079 3,421,115 3,423,688 3,149,190 2,117,052 2,010,872 22,566,737 Net (loss)/profit (169,261 ) 541,602 (60,758 ) 324,335 269,949 47,224 164,557 121,853 (800,622 ) Total comprehensive (loss)/income (169,261 ) 541,602 (60,758 ) 324,335 269,949 47,224 164,557 121,853 (943,860 ) (Loss)/profit allocated to NCI (67,704 ) 319,545 (24,303 ) 129,734 107,980 21,251 82,278 54,834 (287,923 ) (331,321 ) 4,371 Other comprehensive (loss)/income allocated to NCI - - - - - - - - (28,648 ) 152 (28,496 ) Cash flow from operating activities 970,585 1,071,888 195,282 681,568 731,714 426,437 311,668 334,842 3,848,712 Cash flow from investment activities (252,441 ) (1,190,093 ) (383,004 ) (231,142 ) (47,518 ) (242,288 ) (93,434 ) (64,179 ) (3,967,060 ) Cash flow from financing activities (613,010 ) 70,299 156,483 (405,196 ) (680,226 ) (191,231 ) (384,317 ) (288,299 ) (282,625 ) Net increase/ (decrease) in cash and cash equivalents 105,134 (49,605 ) (31,239 ) 45,230 3,970 (7,082 ) (166,083 ) (17,586 ) (402,950 ) Dividends paid to NCI 150,000 532,966 - 160,000 179,023 65,675 133,700 71,103 220,321 Qinbei Power Beijing Cogeneration Luohuang Power Weihai Power Jinling Power Yueyang Power Shidongkou Power Yangliuqing Cogeneration Other individually immaterial subsidiaries Total NCI percentage 40% 59% 40% 40% 40% 45% 50% 45% 31 December 2016 Non-current assets 11,210,604 5,821,110 3,966,880 4,988,112 5,426,759 4,958,325 3,917,340 2,654,085 Current assets 1,472,192 1,041,957 864,069 508,493 649,446 826,089 380,641 563,023 Non-current liabilities (2,206,586 ) (152,911 ) (284,064 ) (104,952 ) (1,773,332 ) (1,150,021 ) (1,055,640 ) (224,373 ) Current liabilities (6,475,340 ) (1,665,750 ) (1,601,236 ) (2,504,410 ) (1,835,090 ) (1,828,581 ) (1,584,142 ) (991,614 ) Net assets 4,000,870 5,044,406 2,945,649 2,887,243 2,467,783 2,805,812 1,658,199 2,001,121 Carrying amount of NCI 1,614,264 2,928,015 1,157,242 1,154,897 987,135 1,260,591 829,099 899,609 5,352,890 16,183,742 Revenue 5,006,349 4,476,729 2,436,586 3,217,209 3,734,108 2,716,817 1,915,915 1,773,869 Net profit 457,311 788,899 122,508 507,900 655,568 243,913 297,211 177,447 Total comprehensive income 457,311 788,899 122,508 507,900 655,568 243,913 297,211 177,447 Profit allocated to NCI 182,924 465,450 49,003 203,160 262,227 109,761 148,606 79,851 326,578 1,827,560 Other comprehensive income allocated to NCI - - - - - - - - 484 484 Cash flow from operating activities 1,400,042 973,352 550,346 1,045,828 1,293,565 568,379 890,615 295,547 Cash flow from investment activities (312,604 ) (540,151 ) (189,599 ) (273,117 ) (37,274 ) (62,622 ) (258,892 ) (197,600 ) Cash flow from financing activities (1,247,836 ) (344,718 ) (319,643 ) (786,471 ) (1,255,955 ) (521,249 ) (462,075 ) (58,293 ) Net (decrease)/increase in cash and cash equivalents (160,398 ) 88,518 41,104 (13,760 ) 336 (15,492 ) 169,648 39,616 Dividends paid to NCI 433,090 687,679 120,000 366,983 308,923 - 273,900 128,857

Principal accounting policies83

Principal accounting policies (Basis of preparation) (Detail) - CNY (¥) ¥ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Principal accounting policies [abstract]
Net current liabilities	¥ 107,413	¥ 93,230
Expected operating cash flows and the undrawn available banking facilities	¥ 241,900

Principal accounting policies84

Principal accounting policies (Property, plant and equipment) (Detail)	12 Months Ended
	Dec. 31, 2017
Dam [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives of property plant and equipment	8 - 50 years
Port facilities [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives of property plant and equipment	20 - 40 years
Buildings [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives of property plant and equipment	8 - 30 years
Electric utility plant in service [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives of property plant and equipment	5 - 30 years
Transportation facilities [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives of property plant and equipment	8 - 27 years
Others [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives of property plant and equipment	5 - 14 years

Principal accounting policies85

Principal accounting policies (Taxation) (Detail)	6 Months Ended		12 Months Ended
	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2017
Sales of power [member] | PRC [member]
Taxation [line items]
Tax rate of VAT			17.00%
Sales of power [member] | Singapore [member]
Taxation [line items]
Tax rate of goods and service tax			7.00%
Sales of heat [member] | PRC [member]
Taxation [line items]
Tax rate of VAT	11.00%	13.00%
Sales of goods [member] | PRC [member]
Taxation [line items]
Tax rate of VAT			17.00%
Lease of tangible movable properties [member] | PRC [member]
Taxation [line items]
Tax rate of VAT			17.00%
Transportation industry [member] | PRC [member]
Taxation [line items]
Tax rate of VAT			11.00%
Other modern services industry [member] | PRC [member]
Taxation [line items]
Tax rate of VAT			6.00%
Construction services [member] | PRC [member]
Taxation [line items]
Tax rate of VAT			11.00%
Lease of immovables [member] | PRC [member]
Taxation [line items]
Tax rate of VAT			11.00%
Sale of immovables [member] | PRC [member]
Taxation [line items]
Tax rate of VAT			11.00%
Transfer of land use rights [member] | PRC [member]
Taxation [line items]
Tax rate of VAT			11.00%
Financial services [member] | PRC [member]
Taxation [line items]
Tax rate of VAT			6.00%
Living services [member] | PRC [member]
Taxation [line items]
Tax rate of VAT			6.00%

Principal accounting policies86

Principal accounting policies (Standards and amendments to published standards that are not yet effective but relevant to Company and its subsidiaries) (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Principal accounting policies [abstract]
Minimum proportion of the Company and its subsidiaries' revenue comprised of contracts with customers from rate-regulated sales of power and heat	95.00%
Future minimum lease payments under non-cancellable operating leases	¥ 1,486,784	¥ 1,430,409

Financial and capital risks m87

Financial and capital risks management (Foreign exchange risk) (Detail) - CNY (¥) ¥ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Presented currency weakened by 5% against foreign currency [member] | Presented currency RMB to foreign currency USD [member]
Financial and capital risks management [line items]
Adjusted amount of exchange gain/loss to be further recognized	¥ (112)	¥ (142)
Presented currency strengthened by 5% against foreign currency [member] | Presented currency RMB to foreign currency USD [member]
Financial and capital risks management [line items]
Adjusted amount of exchange gain/loss to be further recognized	112	142
Presented currency weakened by 3% against foreign currency [member] | Presented currency RMB to foreign currency EUR [member]
Financial and capital risks management [line items]
Adjusted amount of exchange gain/loss to be further recognized	(7)	(9)
Presented currency strengthened by 3% against foreign currency [member] | Presented currency RMB to foreign currency EUR [member]
Financial and capital risks management [line items]
Adjusted amount of exchange gain/loss to be further recognized	7	9
Presented currency weakened by 10% against foreign currency [member] | Presented currency SGD to foreign currency USD [member]
Financial and capital risks management [line items]
Adjusted amount of exchange gain/loss to be further recognized	30	(10)
Presented currency strengthened by 10% against foreign currency [member] | Presented currency SGD to foreign currency USD [member]
Financial and capital risks management [line items]
Adjusted amount of exchange gain/loss to be further recognized	¥ (30)	¥ 10

Financial and capital risks m88

Financial and capital risks management (Cash flow interest rate risk) (Detail) - CNY (¥) ¥ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
50 basis points higher of interest rates on borrowings [member] | RMB [member]
Financial and capital risks management [line items]
Interest expense for the year higher/lower	¥ 789	¥ 520
50 basis points higher of interest rates on borrowings [member] | US$ [member]
Financial and capital risks management [line items]
Interest expense for the year higher/lower	6	7
50 basis points lower of interest rates on borrowings [member] | RMB [member]
Financial and capital risks management [line items]
Interest expense for the year higher/lower	(789)	(520)
50 basis points lower of interest rates on borrowings [member] | US$ [member]
Financial and capital risks management [line items]
Interest expense for the year higher/lower	(6)	(7)
100 basis points higher of interest rates on borrowings [member] | S$ [member]
Financial and capital risks management [line items]
Interest expense for the year higher/lower	72	59
100 basis points lower of interest rates on borrowings [member] | S$ [member]
Financial and capital risks management [line items]
Interest expense for the year higher/lower	¥ (72)	¥ (59)

Financial and capital risks m89

Financial and capital risks management (Credit risk) (Detail) - Singapore segment [member] ¥ in Thousands	12 Months Ended
	Dec. 31, 2017CNY (¥)kWh	Dec. 31, 2016CNY (¥)
Financial and capital risks management [line items]
Minimum monthly consumption of electricity of retail customer | kWh	2,000
Cash deposits held by Singapore subsidiaries | ¥	¥ 161,370	¥ 175,860

Financial and capital risks m90

Financial and capital risks management (Fair value measurements) (Detail) - CNY (¥) ¥ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financial and capital risks management [line items]
Assets	¥ 396,589,511	¥ 314,839,739	[1]
Liabilities	288,974,907	212,653,002	[1]
At fair value [member]
Financial and capital risks management [line items]
Assets	1,202,462	2,199,036
Liabilities	210,664	334,738
At fair value [member] | Financial liabilities at fair value through profit or loss, Trading derivatives (Note 14) [member]
Financial and capital risks management [line items]
Liabilities	125	619
At fair value [member] | Derivatives used for hedging (Note 14) [member]
Financial and capital risks management [line items]
Liabilities	210,539	334,119
At fair value [member] | Financial assets at fair value through profit or loss, Trading derivatives (Note 14) [member]
Financial and capital risks management [line items]
Assets	2,726	5,881
At fair value [member] | Financial assets at fair value through profit or loss, Contingent consideration (Note 40) [member]
Financial and capital risks management [line items]
Assets	859,547
At fair value [member] | Derivatives used for hedging (Note 14) [member]
Financial and capital risks management [line items]
Assets	330,966	372,442
At fair value [member] | Available-for-sale financial assets, Equity securities (Note 10) [member]
Financial and capital risks management [line items]
Assets	9,223	1,820,713
At fair value [member] | Level 1 [member]
Financial and capital risks management [line items]
Assets	9,223	1,820,713
Liabilities	0	0
At fair value [member] | Level 1 [member] | Financial liabilities at fair value through profit or loss, Trading derivatives (Note 14) [member]
Financial and capital risks management [line items]
Liabilities	0	0
At fair value [member] | Level 1 [member] | Derivatives used for hedging (Note 14) [member]
Financial and capital risks management [line items]
Liabilities	0	0
At fair value [member] | Level 1 [member] | Financial assets at fair value through profit or loss, Trading derivatives (Note 14) [member]
Financial and capital risks management [line items]
Assets	0	0
At fair value [member] | Level 1 [member] | Financial assets at fair value through profit or loss, Contingent consideration (Note 40) [member]
Financial and capital risks management [line items]
Assets	0
At fair value [member] | Level 1 [member] | Derivatives used for hedging (Note 14) [member]
Financial and capital risks management [line items]
Assets	0	0
At fair value [member] | Level 1 [member] | Available-for-sale financial assets, Equity securities (Note 10) [member]
Financial and capital risks management [line items]
Assets	9,223	1,820,713
At fair value [member] | Level 2 [member]
Financial and capital risks management [line items]
Assets	333,692	378,323
Liabilities	210,664	334,738
At fair value [member] | Level 2 [member] | Financial liabilities at fair value through profit or loss, Trading derivatives (Note 14) [member]
Financial and capital risks management [line items]
Liabilities	125	619
At fair value [member] | Level 2 [member] | Derivatives used for hedging (Note 14) [member]
Financial and capital risks management [line items]
Liabilities	210,539	334,119
At fair value [member] | Level 2 [member] | Financial assets at fair value through profit or loss, Trading derivatives (Note 14) [member]
Financial and capital risks management [line items]
Assets	2,726	5,881
At fair value [member] | Level 2 [member] | Financial assets at fair value through profit or loss, Contingent consideration (Note 40) [member]
Financial and capital risks management [line items]
Assets	0
At fair value [member] | Level 2 [member] | Derivatives used for hedging (Note 14) [member]
Financial and capital risks management [line items]
Assets	330,966	372,442
At fair value [member] | Level 2 [member] | Available-for-sale financial assets, Equity securities (Note 10) [member]
Financial and capital risks management [line items]
Assets	0	0
At fair value [member] | Level 3 [member]
Financial and capital risks management [line items]
Assets	859,547	0
Liabilities	0	0
At fair value [member] | Level 3 [member] | Financial liabilities at fair value through profit or loss, Trading derivatives (Note 14) [member]
Financial and capital risks management [line items]
Liabilities	0	0
At fair value [member] | Level 3 [member] | Derivatives used for hedging (Note 14) [member]
Financial and capital risks management [line items]
Liabilities	0	0
At fair value [member] | Level 3 [member] | Financial assets at fair value through profit or loss, Trading derivatives (Note 14) [member]
Financial and capital risks management [line items]
Assets	0	0
At fair value [member] | Level 3 [member] | Financial assets at fair value through profit or loss, Contingent consideration (Note 40) [member]
Financial and capital risks management [line items]
Assets	859,547	0
At fair value [member] | Level 3 [member] | Derivatives used for hedging (Note 14) [member]
Financial and capital risks management [line items]
Assets	0	0
At fair value [member] | Level 3 [member] | Available-for-sale financial assets, Equity securities (Note 10) [member]
Financial and capital risks management [line items]
Assets	¥ 0	¥ 0
[1]	Restated. The Company completed the acquisition of equity interests of four companies from Huaneng Group, see Note 40 for details. As the acquisition is a business combination under common control, the transaction is accounted for under merger accounting method under PRC GAAP. The assets and liabilities acquired in business combinations are measured at the carrying amounts of the acquirees in the consolidated financial statements of the ultimate controlling party on the acquisition date. The operating results for all periods presented are retrospectively restated as if the current structure and operations resulting from the acquisition had been in existence from the date when the acquirees first became under the control of the same ultimate controlling party. Therefore the relevant comparative figures in the segment information were restated under PRC GAAP while the acquisition is accounted for using acquisition method under IFRS.

Financial and capital risks m91

Financial and capital risks management (Transfer between levels of fair value hierarchy) (Detail)	12 Months Ended
	Dec. 31, 2017CNY (¥)
Financial and capital risks management [abstract]
Transfers out of Level 1 into Level 2 of fair value hierarchy, assets held at end of reporting period	¥ 0
Transfers out of Level 2 into Level 1 of fair value hierarchy, assets held at end of reporting period	0
Transfers into Level 3 of fair value hierarchy, assets	0
Transfers out of Level 3 of fair value hierarchy, assets	0
Transfers out of Level 1 into Level 2 of fair value hierarchy, liabilities held at end of reporting period	0
Transfers out of Level 2 into Level 1 of fair value hierarchy, liabilities held at end of reporting period	0
Transfers into Level 3 of fair value hierarchy, liabilities	0
Transfers out of Level 3 of fair value hierarchy, liabilities	¥ 0

Financial and capital risks m92

Financial and capital risks management (Movements of Level 3 fair value measurements) (Detail) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017CNY (¥)
Financial and capital risks management [line items]
Beginning of the year	¥ 314,839,739	[1]
Movement:
End of the year	396,589,511
At fair value [member]
Financial and capital risks management [line items]
Beginning of the year	2,199,036
Movement:
End of the year	1,202,462
At fair value [member] | Contingent consideration [member]
Movement:
End of the year	859,547
At fair value [member] | Level 3 [member]
Financial and capital risks management [line items]
Beginning of the year	0
Movement:
End of the year	859,547
At fair value [member] | Level 3 [member] | Contingent consideration [member]
Financial and capital risks management [line items]
Beginning of the year	0
Movement:
Gains on fair value changes	859,547
End of the year	859,547
Total gains for the period included in profit or loss for assets held at the end of the reporting period	¥ 859,547
[1]	Restated. The Company completed the acquisition of equity interests of four companies from Huaneng Group, see Note 40 for details. As the acquisition is a business combination under common control, the transaction is accounted for under merger accounting method under PRC GAAP. The assets and liabilities acquired in business combinations are measured at the carrying amounts of the acquirees in the consolidated financial statements of the ultimate controlling party on the acquisition date. The operating results for all periods presented are retrospectively restated as if the current structure and operations resulting from the acquisition had been in existence from the date when the acquirees first became under the control of the same ultimate controlling party. Therefore the relevant comparative figures in the segment information were restated under PRC GAAP while the acquisition is accounted for using acquisition method under IFRS.

Financial and capital risks m93

Financial and capital risks management (Fair value disclosures) (Detail) - CNY (¥) ¥ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financial and capital risks management [line items]
Liabilities	¥ 288,974,907	¥ 212,653,002	[1]
Long-term loans [member]
Financial and capital risks management [line items]
Liabilities	125,130,000	74,550,000
Long-term bonds [member]
Financial and capital risks management [line items]
Liabilities	19,990,000	15,480,000
At fair value [member]
Financial and capital risks management [line items]
Liabilities	210,664	334,738
At fair value [member] | Long-term loans [member]
Financial and capital risks management [line items]
Liabilities	125,000,000	74,480,000
At fair value [member] | Long-term bonds [member]
Financial and capital risks management [line items]
Liabilities	¥ 19,810,000	¥ 15,710,000
[1]	Restated. The Company completed the acquisition of equity interests of four companies from Huaneng Group, see Note 40 for details. As the acquisition is a business combination under common control, the transaction is accounted for under merger accounting method under PRC GAAP. The assets and liabilities acquired in business combinations are measured at the carrying amounts of the acquirees in the consolidated financial statements of the ultimate controlling party on the acquisition date. The operating results for all periods presented are retrospectively restated as if the current structure and operations resulting from the acquisition had been in existence from the date when the acquirees first became under the control of the same ultimate controlling party. Therefore the relevant comparative figures in the segment information were restated under PRC GAAP while the acquisition is accounted for using acquisition method under IFRS.

Financial and capital risks m94

Financial and capital risks management (Capital risk management) (Detail)	Dec. 31, 2017	Dec. 31, 2016
Financial and capital risks management [abstract]
Debt ratio of the Company and its subsidiaries	72.86%	67.54%

Critical accounting estimates95

Critical accounting estimates and judgments (Detail) ¥ in Millions	12 Months Ended
	Dec. 31, 2017CNY (¥)
Decrease 1% from management's estimates of tariff [member]
Disclosure of changes in accounting estimates [line items]
Impairment against goodwill to be recognized by the Company and its subsidiaries	¥ 681
Impairment against property, plant and equipment and land use rights to be recognized by the Company and its subsidiaries	165
Decrease 5% from management's estimates of tariff [member]
Disclosure of changes in accounting estimates [line items]
Impairment against goodwill to be recognized by the Company and its subsidiaries	3,879
Impairment against property, plant and equipment and land use rights to be recognized by the Company and its subsidiaries	1,165
Increase 1% from management's estimates of fuel price [member]
Disclosure of changes in accounting estimates [line items]
Impairment against goodwill to be recognized by the Company and its subsidiaries	320
Impairment against property, plant and equipment, land use rights and mining rights to be recognized by the Company and its subsidiaries	45
Increase 5% from management's estimates of fuel price [member]
Disclosure of changes in accounting estimates [line items]
Impairment against goodwill to be recognized by the Company and its subsidiaries	2,535
Impairment against property, plant and equipment, land use rights and mining rights to be recognized by the Company and its subsidiaries	¥ 478

Revenue and segment informati96

Revenue and segment information (Revenues recognized during year) (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Revenue and segment information [abstract]
Sales of power and heat	¥ 148,925,442	¥ 112,794,536		¥ 127,849,408
Sales of coal	1,143,299	2,909		6,839
Port service	232,360	237,347		211,685
Transportation service	73,830	105,505		104,721
Others	2,084,513	673,939		732,220
Total revenue	¥ 152,459,444	¥ 113,814,236	[1]	¥ 128,904,873	[1]
[1]	Restated. The Company completed the acquisition of equity interests of four companies from Huaneng Group, see Note 40 for details. As the acquisition is a business combination under common control, the transaction is accounted for under merger accounting method under PRC GAAP. The assets and liabilities acquired in business combinations are measured at the carrying amounts of the acquirees in the consolidated financial statements of the ultimate controlling party on the acquisition date. The operating results for all periods presented are retrospectively restated as if the current structure and operations resulting from the acquisition had been in existence from the date when the acquirees first became under the control of the same ultimate controlling party. Therefore the relevant comparative figures in the segment information were restated under PRC GAAP while the acquisition is accounted for using acquisition method under IFRS.

Revenue and segment informati97

Revenue and segment information (Revenue information under PRC GAAP) (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Disclosure of operating segments [line items]
Revenue	¥ 152,459,444	¥ 113,814,236	[1]	¥ 128,904,873	[1]
Segment results	2,801,733	13,813,138	[1]	22,958,050	[1]
Interest income	198,906	147,063		160,723
Interest expense	(9,749,004)	(6,817,526)	[1]	(7,945,734)	[1]
Impairment (loss) /reversal	(1,187,212)	(1,204,958)	[1]	(3,090,153)	[1]
Depreciation and amortization	(20,635,833)	(15,162,715)	[1]	(14,717,613)	[1]
Net (loss) /gain on disposal of non-current assets	(616,456)	(590,049)	[1]	(438,321)	[1]
Share of profits less losses of associates and joint ventures	425,215	1,298,889	[1]	1,525,975	[1]
Income tax expense	(1,217,526)	(3,465,151)	[1]	(5,698,943)	[1]
PRC GAAP [member] | From external customers [member]
Disclosure of operating segments [line items]
Revenue	152,459,444	138,150,296	[1]	154,145,268	[1]
Segment results	2,141,806	17,312,598	[1]	26,927,070	[1]
Interest income	198,906	172,560	[1]	182,777	[1]
Interest expense	(9,622,104)	(8,571,728)	[1]	(10,141,649)	[1]
Impairment (loss) /reversal	(1,188,487)	(1,418,309)	[1]	(3,288,757)	[1]
Depreciation and amortization	(19,128,042)	(18,302,672)	[1]	(17,736,976)	[1]
Net (loss) /gain on disposal of non-current assets	(581,343)	(707,566)	[1]	(495,371)	[1]
Share of profits less losses of associates and joint ventures	300,605	1,047,397	[1]	1,265,540	[1]
Income tax expense	(1,573,470)	(4,508,967)	[1]	(6,852,038)	[1]
PRC GAAP [member] | Total [member]
Disclosure of operating segments [line items]
Revenue	152,840,065	138,495,162	[1]	154,411,969	[1]
PRC GAAP [member] | Inter-segment [member]
Disclosure of operating segments [line items]
Revenue	(380,621)	(344,866)	[1]	(266,701)	[1]
PRC power segment [member] | PRC GAAP [member] | From external customers [member]
Disclosure of operating segments [line items]
Revenue	142,067,629	129,101,375	[1]	143,679,910	[1]
Segment results	2,417,073	17,633,734	[1]	27,473,279	[1]
Interest income	126,927	102,265	[1]	115,378	[1]
Interest expense	(9,026,064)	(7,952,640)	[1]	(9,526,290)	[1]
Impairment (loss) /reversal	(1,167,751)	(1,410,733)	[1]	(3,112,370)	[1]
Depreciation and amortization	(18,081,299)	(17,320,753)	[1]	(16,719,037)	[1]
Net (loss) /gain on disposal of non-current assets	(580,345)	(693,091)	[1]	(517,820)	[1]
Share of profits less losses of associates and joint ventures	(7,318)	973,982	[1]	1,247,293	[1]
Income tax expense	(1,667,234)	(4,610,591)	[1]	(7,121,207)	[1]
PRC power segment [member] | PRC GAAP [member] | Total [member]
Disclosure of operating segments [line items]
Revenue	142,067,629	129,101,375	[1]	143,679,910	[1]
PRC power segment [member] | PRC GAAP [member] | Inter-segment [member]
Disclosure of operating segments [line items]
Revenue	0	0	[1]	0	[1]
Singapore segment [member] | PRC GAAP [member] | From external customers [member]
Disclosure of operating segments [line items]
Revenue	10,078,031	8,758,822	[1]	10,143,793	[1]
Segment results	(577,458)	(282,703)	[1]	(313,253)	[1]
Interest income	70,756	69,672	[1]	66,898	[1]
Interest expense	(450,928)	(481,263)	[1]	(452,034)	[1]
Impairment (loss) /reversal	(994)	899	[1]	1,744	[1]
Depreciation and amortization	(856,979)	(778,426)	[1]	(772,003)	[1]
Net (loss) /gain on disposal of non-current assets	(995)	(172)	[1]	22,450	[1]
Share of profits less losses of associates and joint ventures	0	0	[1]	0	[1]
Income tax expense	99,150	44,135	[1]	254,772	[1]
Singapore segment [member] | PRC GAAP [member] | Total [member]
Disclosure of operating segments [line items]
Revenue	10,078,031	8,758,822	[1]	10,143,793	[1]
Singapore segment [member] | PRC GAAP [member] | Inter-segment [member]
Disclosure of operating segments [line items]
Revenue	0	0	[1]	0	[1]
All other segments [member] | PRC GAAP [member] | From external customers [member]
Disclosure of operating segments [line items]
Revenue	313,784	290,099	[1]	321,565	[1]
Segment results	302,191	(38,433)	[1]	(232,956)	[1]
Interest income	1,223	623	[1]	501	[1]
Interest expense	(145,112)	(137,825)	[1]	(163,325)	[1]
Impairment (loss) /reversal	(19,742)	(8,475)	[1]	(178,131)	[1]
Depreciation and amortization	(189,764)	(203,493)	[1]	(245,936)	[1]
Net (loss) /gain on disposal of non-current assets	(3)	(14,303)	[1]	(1)	[1]
Share of profits less losses of associates and joint ventures	307,923	73,415	[1]	18,247	[1]
Income tax expense	(5,386)	57,489	[1]	14,397	[1]
All other segments [member] | PRC GAAP [member] | Total [member]
Disclosure of operating segments [line items]
Revenue	694,405	634,965	[1]	588,266	[1]
All other segments [member] | PRC GAAP [member] | Inter-segment [member]
Disclosure of operating segments [line items]
Revenue	¥ (380,621)	¥ (344,866)	[1]	¥ (266,701)	[1]
[1]	Restated. The Company completed the acquisition of equity interests of four companies from Huaneng Group, see Note 40 for details. As the acquisition is a business combination under common control, the transaction is accounted for under merger accounting method under PRC GAAP. The assets and liabilities acquired in business combinations are measured at the carrying amounts of the acquirees in the consolidated financial statements of the ultimate controlling party on the acquisition date. The operating results for all periods presented are retrospectively restated as if the current structure and operations resulting from the acquisition had been in existence from the date when the acquirees first became under the control of the same ultimate controlling party. Therefore the relevant comparative figures in the segment information were restated under PRC GAAP while the acquisition is accounted for using acquisition method under IFRS.

Revenue and segment informati98

Revenue and segment information (Assets and liabilities information under PRC GAAP) (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	[1]
Disclosure of operating segments [line items]
Segment assets	¥ 396,589,511	¥ 314,839,739
Including:
Segment liabilities	(288,974,907)	(212,653,002)
PRC GAAP [member] | Reportable segment total [member]
Disclosure of operating segments [line items]
Segment assets	372,175,669	371,871,180
Including:
Additions to non-current assets (excluding financial assets and deferred income tax assets)	25,035,959	28,515,663
Investments in associates	15,497,696	15,408,079
Investments in joint ventures	2,482,781	2,992,612
Segment liabilities	(281,142,558)	(265,848,676)
PRC power segment [member] | PRC GAAP [member] | Reportable segment total [member]
Disclosure of operating segments [line items]
Segment assets	334,379,104	331,939,958
Including:
Additions to non-current assets (excluding financial assets and deferred income tax assets)	24,447,658	27,430,205
Investments in associates	12,577,836	12,527,711
Investments in joint ventures	1,457,247	2,202,002
Segment liabilities	(264,115,887)	(246,200,555)
Singapore segment [member] | PRC GAAP [member] | Reportable segment total [member]
Disclosure of operating segments [line items]
Segment assets	27,817,680	28,141,718
Including:
Additions to non-current assets (excluding financial assets and deferred income tax assets)	260,240	230,974
Investments in associates	0	0
Investments in joint ventures	0	0
Segment liabilities	(14,000,442)	(14,027,606)
All other segments [member] | PRC GAAP [member] | Reportable segment total [member]
Disclosure of operating segments [line items]
Segment assets	9,978,885	11,789,504
Including:
Additions to non-current assets (excluding financial assets and deferred income tax assets)	328,061	854,484
Investments in associates	2,919,860	2,880,368
Investments in joint ventures	1,025,534	790,610
Segment liabilities	¥ (3,026,229)	¥ (5,620,515)
[1]	Restated. The Company completed the acquisition of equity interests of four companies from Huaneng Group, see Note 40 for details. As the acquisition is a business combination under common control, the transaction is accounted for under merger accounting method under PRC GAAP. The assets and liabilities acquired in business combinations are measured at the carrying amounts of the acquirees in the consolidated financial statements of the ultimate controlling party on the acquisition date. The operating results for all periods presented are retrospectively restated as if the current structure and operations resulting from the acquisition had been in existence from the date when the acquirees first became under the control of the same ultimate controlling party. Therefore the relevant comparative figures in the segment information were restated under PRC GAAP while the acquisition is accounted for using acquisition method under IFRS.

Revenue and segment informati99

Revenue and segment information (Reconciliation of revenue from external customers to operating revenue) (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	[1]	Dec. 31, 2015	[1]
Reconciliation of revenue from external customers to operating revenue [line items]
Revenue	¥ 152,459,444	¥ 113,814,236		¥ 128,904,873
PRC GAAP [member] | From external customers [member]
Reconciliation of revenue from external customers to operating revenue [line items]
Revenue	152,459,444	138,150,296		154,145,268
Impact of restatement under PRC GAAP in relation to business combination under common control (Note 40) [member]
Reconciliation of revenue from external customers to operating revenue [line items]
Revenue	¥ 0	¥ (24,336,060)		¥ (25,240,395)
[1]	Restated. The Company completed the acquisition of equity interests of four companies from Huaneng Group, see Note 40 for details. As the acquisition is a business combination under common control, the transaction is accounted for under merger accounting method under PRC GAAP. The assets and liabilities acquired in business combinations are measured at the carrying amounts of the acquirees in the consolidated financial statements of the ultimate controlling party on the acquisition date. The operating results for all periods presented are retrospectively restated as if the current structure and operations resulting from the acquisition had been in existence from the date when the acquirees first became under the control of the same ultimate controlling party. Therefore the relevant comparative figures in the segment information were restated under PRC GAAP while the acquisition is accounted for using acquisition method under IFRS.

Revenue and segment informat100

Revenue and segment information (Reconciliation of segment result to profit before income tax expense) (Detail) - CNY (¥) ¥ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	[1]	Dec. 31, 2015	[1]
Reconciliation of segment result to profit before income tax expense [line items]
Profit before income tax expense		¥ 2,801,733	¥ 13,813,138		¥ 22,958,050
PRC GAAP [member] | Reportable segment total [member]
Reconciliation of segment result to profit before income tax expense [line items]
Profit before income tax expense		2,141,806	17,312,598		26,927,070
PRC GAAP [member] | Loss related to the headquarter [member]
Reconciliation of segment result to profit before income tax expense [line items]
Profit before income tax expense		(170,210)	(699,054)		(327,262)
PRC GAAP [member] | Investment income from China Huaneng Finance Co., Ltd. ("Huaneng Finance") [member]
Reconciliation of segment result to profit before income tax expense [line items]
Profit before income tax expense		143,794	132,018		135,971
PRC GAAP [member] | Dividend income of available-for-sale financial assets [member]
Reconciliation of segment result to profit before income tax expense [line items]
Profit before income tax expense		124,918	105,337		99,071
PRC GAAP [member] | Gains on disposal of available-for-sale financial asset [member]
Reconciliation of segment result to profit before income tax expense [line items]
Profit before income tax expense		1,479,732	932,738		4,282
Impact of restatement under PRC GAAP in relation to business combination under common control (Note 40) [member]
Reconciliation of segment result to profit before income tax expense [line items]
Profit before income tax expense		0	(3,417,300)		(3,454,005)
Impact of other IFRS adjustments [member]
Reconciliation of segment result to profit before income tax expense [line items]
Profit before income tax expense	[2]	¥ (918,307)	¥ (553,199)		¥ (427,077)
[1]	Restated. The Company completed the acquisition of equity interests of four companies from Huaneng Group, see Note 40 for details. As the acquisition is a business combination under common control, the transaction is accounted for under merger accounting method under PRC GAAP. The assets and liabilities acquired in business combinations are measured at the carrying amounts of the acquirees in the consolidated financial statements of the ultimate controlling party on the acquisition date. The operating results for all periods presented are retrospectively restated as if the current structure and operations resulting from the acquisition had been in existence from the date when the acquirees first became under the control of the same ultimate controlling party. Therefore the relevant comparative figures in the segment information were restated under PRC GAAP while the acquisition is accounted for using acquisition method under IFRS.
[2]	Other GAAP adjustments above primarily represented the classification adjustments and other adjustments. Other than the classification adjustments, the differences will be gradually eliminated following subsequent depreciation and amortization of related assets or the extinguishment of liabilities.

Revenue and segment informat101

Revenue and segment information (Reportable segments' assets reconciled to total assets) (Detail) - CNY (¥) ¥ in Thousands		Dec. 31, 2017	Dec. 31, 2016	[1]
Reportable segments' assets [line items]
Segment assets		¥ 396,589,511	¥ 314,839,739
PRC GAAP [member] | Reportable segment total [member]
Reportable segments' assets [line items]
Segment assets		372,175,669	371,871,180
PRC GAAP [member] | Investment in Huaneng Finance [member]
Reportable segments' assets [line items]
Segment assets		1,336,777	1,314,603
PRC GAAP [member] | Deferred income tax assets [member]
Reportable segments' assets [line items]
Segment assets		2,980,303	2,447,648
PRC GAAP [member] | Prepaid income tax [member]
Reportable segments' assets [line items]
Segment assets		150,838	204,182
PRC GAAP [member] | Available-for-sale financial assets [member]
Reportable segments' assets [line items]
Segment assets		1,654,993	3,560,928
PRC GAAP [member] | Corporate assets [member]
Reportable segments' assets [line items]
Segment assets		395,148	360,854
Impact of restatement under PRC GAAP in relation to business combination under common control (Note 40) [member]
Reportable segments' assets [line items]
Segment assets		0	(70,341,769)
Impact of other IFRS adjustments [member]
Reportable segments' assets [line items]
Segment assets	[2]	¥ 17,895,783	¥ 5,422,113
[1]	Restated. The Company completed the acquisition of equity interests of four companies from Huaneng Group, see Note 40 for details. As the acquisition is a business combination under common control, the transaction is accounted for under merger accounting method under PRC GAAP. The assets and liabilities acquired in business combinations are measured at the carrying amounts of the acquirees in the consolidated financial statements of the ultimate controlling party on the acquisition date. The operating results for all periods presented are retrospectively restated as if the current structure and operations resulting from the acquisition had been in existence from the date when the acquirees first became under the control of the same ultimate controlling party. Therefore the relevant comparative figures in the segment information were restated under PRC GAAP while the acquisition is accounted for using acquisition method under IFRS.
[2]	Other GAAP adjustments above primarily represented the classification adjustments and other adjustments. Other than the classification adjustments, the differences will be gradually eliminated following subsequent depreciation and amortization of related assets or the extinguishment of liabilities.

Revenue and segment informat102

Revenue and segment information (Reportable segments' liabilities reconciled to total liabilities) (Detail) - CNY (¥) ¥ in Thousands		Dec. 31, 2017	Dec. 31, 2016	[1]
Reportable segments' liabilities [line items]
Segment liabilities		¥ (288,974,907)	¥ (212,653,002)
PRC GAAP [member] | Reportable segment total [member]
Reportable segments' liabilities [line items]
Segment liabilities		(281,142,558)	(265,848,676)
PRC GAAP [member] | Current income tax liabilities [member]
Reportable segments' liabilities [line items]
Segment liabilities		(430,703)	(572,515)
PRC GAAP [member] | Deferred income tax liabilities [member]
Reportable segments' liabilities [line items]
Segment liabilities		(1,283,950)	(1,429,859)
PRC GAAP [member] | Corporate liabilities [member]
Reportable segments' liabilities [line items]
Segment liabilities		(3,632,847)	(4,717,617)
Impact of restatement under PRC GAAP in relation to business combination under common control (Note 40) [member]
Reportable segments' liabilities [line items]
Segment liabilities		0	59,917,072
Impact of other IFRS adjustments [member]
Reportable segments' liabilities [line items]
Segment liabilities	[2]	¥ (2,484,849)	¥ (1,407)
[1]	Restated. The Company completed the acquisition of equity interests of four companies from Huaneng Group, see Note 40 for details. As the acquisition is a business combination under common control, the transaction is accounted for under merger accounting method under PRC GAAP. The assets and liabilities acquired in business combinations are measured at the carrying amounts of the acquirees in the consolidated financial statements of the ultimate controlling party on the acquisition date. The operating results for all periods presented are retrospectively restated as if the current structure and operations resulting from the acquisition had been in existence from the date when the acquirees first became under the control of the same ultimate controlling party. Therefore the relevant comparative figures in the segment information were restated under PRC GAAP while the acquisition is accounted for using acquisition method under IFRS.
[2]	Other GAAP adjustments above primarily represented the classification adjustments and other adjustments. Other than the classification adjustments, the differences will be gradually eliminated following subsequent depreciation and amortization of related assets or the extinguishment of liabilities.

Revenue and segment informat103

Revenue and segment information (Other material items) (Detail) - CNY (¥) ¥ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	[1]	Dec. 31, 2015	[1]
Other material items [line items]
Revenue		¥ 152,459,444	¥ 113,814,236		¥ 128,904,873
Interest expense		(9,749,004)	(6,817,526)		(7,945,734)
Depreciation and amortization		(20,635,833)	(15,162,715)		(14,717,613)
Impairment loss		(1,187,212)	(1,204,958)		(3,090,153)
Share of profits less losses of associates and joint ventures		425,215	1,298,889		1,525,975
Net (loss) /gain on disposal of non-current assets		(616,456)	(590,049)		(438,321)
Income tax expense		(1,217,526)	(3,465,151)		(5,698,943)
PRC GAAP [member] | Reportable segment total [member]
Other material items [line items]
Revenue		152,459,444	138,150,296		154,145,268
Interest expense		(9,622,104)	(8,571,728)		(10,141,649)
Depreciation and amortization		(19,128,042)	(18,302,672)		(17,736,976)
Impairment loss		(1,188,487)	(1,418,309)		(3,288,757)
Share of profits less losses of associates and joint ventures		300,605	1,047,397		1,265,540
Net (loss) /gain on disposal of non-current assets		(581,343)	(707,566)		(495,371)
Income tax expense		(1,573,470)	(4,508,967)		(6,852,038)
PRC GAAP [member] | Headquarters [member]
Other material items [line items]
Revenue		0	0		0
Interest expense		(126,900)	(131,244)		(149,259)
Depreciation and amortization		(38,819)	(48,934)		(60,236)
Impairment loss		0	0		0
Share of profits less losses of associates and joint ventures		0	0		0
Net (loss) /gain on disposal of non-current assets		3,174	(14)		(6)
Income tax expense		0	0		0
PRC GAAP [member] | Investment income from Huaneng Finance [member]
Other material items [line items]
Revenue		0	0		0
Interest expense		0	0		0
Depreciation and amortization		0	0		0
Impairment loss		0	0		0
Share of profits less losses of associates and joint ventures		143,794	132,018		135,971
Net (loss) /gain on disposal of non-current assets		0	0		0
Income tax expense		0	0		0
Impact of restatement under PRC GAAP in relation to business combination under common control [member]
Other material items [line items]
Revenue		0	(24,336,060)		(25,240,395)
Interest expense		0	1,885,446		2,345,174
Depreciation and amortization		0	3,533,820		3,474,072
Impairment loss		0	213,351		198,604
Share of profits less losses of associates and joint ventures		0	133,694		180,447
Net (loss) /gain on disposal of non-current assets		0	115,769		90,534
Income tax expense		0	928,854		1,016,588
Impact of other IFRS adjustments [member]
Other material items [line items]
Revenue	[2]	0	0		0
Interest expense	[2]	0	0		0
Depreciation and amortization	[2]	(1,468,972)	(344,929)		(394,473)
Impairment loss	[2]	1,275	0		0
Share of profits less losses of associates and joint ventures	[2]	(19,184)	(14,220)		(55,983)
Net (loss) /gain on disposal of non-current assets	[2]	(38,287)	1,762		(33,478)
Income tax expense	[2]	¥ 355,944	¥ 114,962		¥ 136,507
[1]	Restated. The Company completed the acquisition of equity interests of four companies from Huaneng Group, see Note 40 for details. As the acquisition is a business combination under common control, the transaction is accounted for under merger accounting method under PRC GAAP. The assets and liabilities acquired in business combinations are measured at the carrying amounts of the acquirees in the consolidated financial statements of the ultimate controlling party on the acquisition date. The operating results for all periods presented are retrospectively restated as if the current structure and operations resulting from the acquisition had been in existence from the date when the acquirees first became under the control of the same ultimate controlling party. Therefore the relevant comparative figures in the segment information were restated under PRC GAAP while the acquisition is accounted for using acquisition method under IFRS.
[2]	Other GAAP adjustments above primarily represented the classification adjustments and other adjustments. Other than the classification adjustments, the differences will be gradually eliminated following subsequent depreciation and amortization of related assets or the extinguishment of liabilities.

Revenue and segment informat104

Revenue and segment information (Geographical information (Under IFRS)) (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Geographical information (Under IFRS) [line items]
Revenue from external customers	¥ 152,459,444	¥ 113,814,236	[1]	¥ 128,904,873	[1]
Non-current assets (excluding financial assets and deferred income tax assets)	342,570,291	272,525,687
PRC [member]
Geographical information (Under IFRS) [line items]
Revenue from external customers	142,381,413	105,055,414		118,761,080
Non-current assets (excluding financial assets and deferred income tax assets)	319,534,533	249,155,921
Singapore [member]
Geographical information (Under IFRS) [line items]
Revenue from external customers	10,078,031	8,758,822		¥ 10,143,793
Non-current assets (excluding financial assets and deferred income tax assets)	¥ 23,035,758	¥ 23,369,766
[1]	Restated. The Company completed the acquisition of equity interests of four companies from Huaneng Group, see Note 40 for details. As the acquisition is a business combination under common control, the transaction is accounted for under merger accounting method under PRC GAAP. The assets and liabilities acquired in business combinations are measured at the carrying amounts of the acquirees in the consolidated financial statements of the ultimate controlling party on the acquisition date. The operating results for all periods presented are retrospectively restated as if the current structure and operations resulting from the acquisition had been in existence from the date when the acquirees first became under the control of the same ultimate controlling party. Therefore the relevant comparative figures in the segment information were restated under PRC GAAP while the acquisition is accounted for using acquisition method under IFRS.

Revenue and segment informat105

Revenue and segment information (Information on sales to major customers) (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Information on sales to major customers [line items]
Minimum proportion of sales to major customers at amount against external revenue	10.00%	10.00%		10.00%
Revenue	¥ 152,459,444	¥ 113,814,236	[1]	¥ 128,904,873	[1]
State Grid Shandong Electric Power Company [member]
Information on sales to major customers [line items]
Revenue	¥ 28,659,891	¥ 12,649,224		¥ 14,855,655
Proportion	19.00%	11.00%		12.00%
Grid companies under common control of State Grid Corporation of China [member]
Information on sales to major customers [line items]
Proportion	76.00%	74.00%		81.00%
[1]	Restated. The Company completed the acquisition of equity interests of four companies from Huaneng Group, see Note 40 for details. As the acquisition is a business combination under common control, the transaction is accounted for under merger accounting method under PRC GAAP. The assets and liabilities acquired in business combinations are measured at the carrying amounts of the acquirees in the consolidated financial statements of the ultimate controlling party on the acquisition date. The operating results for all periods presented are retrospectively restated as if the current structure and operations resulting from the acquisition had been in existence from the date when the acquirees first became under the control of the same ultimate controlling party. Therefore the relevant comparative figures in the segment information were restated under PRC GAAP while the acquisition is accounted for using acquisition method under IFRS.

Profit before income tax exp106

Profit before income tax expense (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Profit before income tax expense [abstract]
Total interest expense on borrowing	¥ 10,225,069		¥ 7,267,490		¥ 8,716,074
Less: amounts capitalized in property, plant and equipment	476,065		449,964		770,340
Interest expenses charged in consolidated statement of comprehensive income	9,749,004		6,817,526	[1]	7,945,734	[1]
Auditors' remuneration-audit services	64,160		43,610		41,640
Operating leases charge	364,756		331,496		313,723
Fuel	92,737,304		56,617,542		59,242,367
Depreciation of property, plant and equipment	20,180,830		14,815,620		14,411,632
Amortization of land use rights	341,125		225,707		213,206
Amortization of other non-current assets	113,878		121,388		92,775
Impairment loss of property, plant and equipment	1,046,195		1,063,735		1,047,641
Impairment losses for land use rights	108,590		51,981		0
Impairment loss of investment in an associate	0		0		178,131
Impairment loss of mining rights	0		0		760,296
Impairment loss of goodwill	0		0		1,105,649
Impairment loss of other non-current assets	5,008		0		0
Recognition/ (reversal) of provision for doubtful accounts	27,682		89,498		(3,392)
(Reversal) /recognition of provision for inventory obsolescence	(263)		(256)		1,828
Net loss on disposals of non-current assets	616,456		590,049	[1]	438,321	[1]
Government grants	(421,912)		(396,467)		(696,735)
Gain on a bargain purchase	0		(129,921)		0
Included in other investment income [abstract]
Gains on disposal of available-for-sale financial asset (Note 10)	(1,479,732)		(932,738)		0
Dividends on available-for-sale financial assets	(124,918)		(103,037)		(97,696)
Gains on disposal of subsidiaries	(52,330)	[2]	0		0
Included in (gain) /loss on fair value changes of financial assets/liabilities
Contingent consideration of the business combination (Note 40)	(859,547)		0		0
Loss on fair value changes of trading derivatives	¥ 2,761		¥ 12,986		¥ 16,762
[1]	Restated. The Company completed the acquisition of equity interests of four companies from Huaneng Group, see Note 40 for details. As the acquisition is a business combination under common control, the transaction is accounted for under merger accounting method under PRC GAAP. The assets and liabilities acquired in business combinations are measured at the carrying amounts of the acquirees in the consolidated financial statements of the ultimate controlling party on the acquisition date. The operating results for all periods presented are retrospectively restated as if the current structure and operations resulting from the acquisition had been in existence from the date when the acquirees first became under the control of the same ultimate controlling party. Therefore the relevant comparative figures in the segment information were restated under PRC GAAP while the acquisition is accounted for using acquisition method under IFRS.
[2]	For the disposals of Taishan Power Limited Company and Huaneng (Fujian) Harbour Limited Company with no interest being retained. The Company received consideration of RMB781 million and RMB222 Million respectively. The investment income of 52 million was recognized and the related non-controlling interests of RMB681 million and RMB186 million with the subsidiaries were derecognized.

Profit before income tax exp107

Profit before income tax expense (Narrative) (Detail) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017CNY (¥)
Disclosure of detailed information about disposal of subsidiaries [line items]
Related non-controlling interests derecognized	¥ 866,859
Non-controlling interests [member]
Disclosure of detailed information about disposal of subsidiaries [line items]
Related non-controlling interests derecognized	¥ 866,859
Taishan Power Limited Company [member]
Disclosure of detailed information about disposal of subsidiaries [line items]
Proportion of interest retained after disposal of subsidiaries	0.00%
Consideration received by the Company	¥ 781,000
Taishan Power Limited Company [member] | Non-controlling interests [member]
Disclosure of detailed information about disposal of subsidiaries [line items]
Related non-controlling interests derecognized	¥ 681,000
Huaneng (Fujian) Harbour Limited Company [member]
Disclosure of detailed information about disposal of subsidiaries [line items]
Proportion of interest retained after disposal of subsidiaries	0.00%
Consideration received by the Company	¥ 222,000
Huaneng (Fujian) Harbour Limited Company [member] | Non-controlling interests [member]
Disclosure of detailed information about disposal of subsidiaries [line items]
Related non-controlling interests derecognized	¥ 186,000

Property, plant and equipmen108

Property, plant and equipment (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of detailed information about property, plant and equipment [line items]
Beginning of the year	¥ 223,061,809	¥ 219,673,070
Reclassification	0	0
Business combination (Note 40)	63,780,809	319,505
Additions	22,155,315	19,382,330
Transfer from CIP	0	0
Disposals/write-off	(1,330,866)	(811,085)
Disposal of subsidiaries	(2,243,726)
Depreciation charge	(20,201,165)	(14,844,164)
Impairment charge	(1,046,195)	(1,063,735)	¥ (1,047,641)
Currency translation differences	152,112	405,888
End of the year	284,328,093	223,061,809	219,673,070
Cost [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning of the year	391,185,752	372,491,749
End of the year	471,776,159	391,185,752	372,491,749
Accumulated depreciation [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning of the year	(159,818,330)	(145,688,967)
End of the year	(178,100,381)	(159,818,330)	(145,688,967)
Accumulated impairment loss [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning of the year	(8,305,613)	(7,129,712)
End of the year	(9,347,685)	(8,305,613)	(7,129,712)
Dam [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning of the year	1,379,598	1,433,838
Reclassification	49,386	0
Business combination (Note 40)	279,169	0
Additions	0	0
Transfer from CIP	15,355	20,170
Disposals/write-off	0	0
Disposal of subsidiaries	0
Depreciation charge	(40,200)	(32,987)
Impairment charge	(45,619)	(41,423)
Currency translation differences	0	0
End of the year	1,637,689	1,379,598	1,433,838
Dam [member] | Cost [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning of the year	1,876,314	1,856,144
End of the year	2,220,224	1,876,314	1,856,144
Dam [member] | Accumulated depreciation [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning of the year	(186,312)	(153,325)
End of the year	(226,512)	(186,312)	(153,325)
Dam [member] | Accumulated impairment loss [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning of the year	(310,404)	(268,981)
End of the year	(356,023)	(310,404)	(268,981)
Port facilities [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning of the year	3,560,237	3,423,794
Reclassification	(404)	1,771
Business combination (Note 40)	0	0
Additions	0	1,770
Transfer from CIP	114,688	246,712
Disposals/write-off	(14,731)	0
Disposal of subsidiaries	(632,709)
Depreciation charge	(111,529)	(113,810)
Impairment charge	0	0
Currency translation differences	0	0
End of the year	2,915,552	3,560,237	3,423,794
Port facilities [member] | Cost [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning of the year	4,116,914	3,860,009
End of the year	3,358,811	4,116,914	3,860,009
Port facilities [member] | Accumulated depreciation [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning of the year	(556,677)	(436,215)
End of the year	(443,259)	(556,677)	(436,215)
Port facilities [member] | Accumulated impairment loss [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning of the year	0	0
End of the year	0	0	0
Buildings [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning of the year	6,236,324	5,728,768
Reclassification	52,047	(492,558)
Business combination (Note 40)	1,944,531	8,098
Additions	184	127
Transfer from CIP	342,285	1,319,019
Disposals/write-off	(30,837)	(68,945)
Disposal of subsidiaries	(101,169)
Depreciation charge	(339,630)	(255,882)
Impairment charge	(1,651)	(2,303)
Currency translation differences	0	0
End of the year	8,102,084	6,236,324	5,728,768
Buildings [member] | Cost [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning of the year	9,056,858	8,306,471
End of the year	11,173,669	9,056,858	8,306,471
Buildings [member] | Accumulated depreciation [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning of the year	(2,749,300)	(2,508,772)
End of the year	(3,019,198)	(2,749,300)	(2,508,772)
Buildings [member] | Accumulated impairment loss [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning of the year	(71,234)	(68,931)
End of the year	(52,387)	(71,234)	(68,931)
Electric utility plant in service [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning of the year	181,700,877	183,006,185
Reclassification	(157,759)	495,841
Business combination (Note 40)	58,379,270	303,854
Additions	840,991	418,812
Transfer from CIP	20,283,508	12,576,736
Disposals/write-off	(1,252,829)	(495,251)
Disposal of subsidiaries	(114,542)
Depreciation charge	(19,155,852)	(14,004,881)
Impairment charge	(754,753)	(1,005,367)
Currency translation differences	151,249	404,948
End of the year	239,920,160	181,700,877	183,006,185
Electric utility plant in service [member] | Cost [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning of the year	341,195,395	327,827,738
End of the year	418,360,698	341,195,395	327,827,738
Electric utility plant in service [member] | Accumulated depreciation [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning of the year	(152,408,524)	(138,852,591)
End of the year	(170,525,898)	(152,408,524)	(138,852,591)
Electric utility plant in service [member] | Accumulated impairment loss [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning of the year	(7,085,994)	(5,968,962)
End of the year	(7,914,640)	(7,085,994)	(5,968,962)
Transportation facilities [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning of the year	554,659	609,064
Reclassification	(4,357)	759
Business combination (Note 40)	17,243	0
Additions	0	0
Transfer from CIP	288,554	20,033
Disposals/write-off	(3,907)	(26,477)
Disposal of subsidiaries	0
Depreciation charge	(59,022)	(48,720)
Impairment charge	0	0
Currency translation differences	0	0
End of the year	793,170	554,659	609,064
Transportation facilities [member] | Cost [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning of the year	875,630	980,290
End of the year	1,155,392	875,630	980,290
Transportation facilities [member] | Accumulated depreciation [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning of the year	(320,971)	(371,226)
End of the year	(362,222)	(320,971)	(371,226)
Transportation facilities [member] | Accumulated impairment loss [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning of the year	0	0
End of the year	0	0	0
Others [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning of the year	2,357,009	2,361,234
Reclassification	61,087	(5,813)
Business combination (Note 40)	443,052	2,977
Additions	88,160	122,519
Transfer from CIP	145,705	296,648
Disposals/write-off	(28,562)	(27,055)
Disposal of subsidiaries	(153,096)
Depreciation charge	(494,932)	(387,884)
Impairment charge	(2,503)	(6,399)
Currency translation differences	263	782
End of the year	2,416,183	2,357,009	2,361,234
Others [member] | Cost [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning of the year	6,041,783	5,809,400
End of the year	5,972,688	6,041,783	5,809,400
Others [member] | Accumulated depreciation [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning of the year	(3,596,546)	(3,366,838)
End of the year	(3,523,292)	(3,596,546)	(3,366,838)
Others [member] | Accumulated impairment loss [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning of the year	(88,228)	(81,328)
End of the year	(33,213)	(88,228)	(81,328)
CIP [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning of the year	27,273,105	23,110,187
Reclassification	0	0
Business combination (Note 40)	2,717,544	4,576
Additions	21,225,980	18,839,102
Transfer from CIP	(21,190,095)	(14,479,318)
Disposals/write-off	0	(193,357)
Disposal of subsidiaries	(1,242,210)
Depreciation charge	0	0
Impairment charge	(241,669)	(8,243)
Currency translation differences	600	158
End of the year	28,543,255	27,273,105	23,110,187
CIP [member] | Cost [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning of the year	28,022,858	23,851,697
End of the year	29,534,677	28,022,858	23,851,697
CIP [member] | Accumulated depreciation [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning of the year	0	0
End of the year	0	0	0
CIP [member] | Accumulated impairment loss [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning of the year	(749,753)	(741,510)
End of the year	¥ (991,422)	¥ (749,753)	¥ (741,510)

Property, plant and equipmen109

Property, plant and equipment (Interest capitalization) (Detail) - CNY (¥) ¥ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Property, plant and equipment [abstract]
Interest expense arising on borrowings	¥ 476	¥ 450
Weighted average capitalization rate	4.54%	4.52%

Property, plant and equipmen110

Property, plant and equipment (Impairment) (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of detailed information about property, plant and equipment [line items]
Impairment loss of property, plant and equipment	¥ 1,046,195	¥ 1,063,735	¥ 1,047,641
Impairment losses for land use rights	¥ 108,590	¥ 51,981	¥ 0
Coal-fired power plant one [member]
Disclosure of detailed information about property, plant and equipment [line items]
Discount rates	9.50%	8.06%
Coal-fired power plant two [member]
Disclosure of detailed information about property, plant and equipment [line items]
Discount rates	9.98%	8.97%
Coal-fired power plant three [member]
Disclosure of detailed information about property, plant and equipment [line items]
Discount rates	9.89%
Coal-fired power plant four [member]
Disclosure of detailed information about property, plant and equipment [line items]
Discount rates	14.74%
Hydropower plant one [member]
Disclosure of detailed information about property, plant and equipment [line items]
Discount rates	9.14%	8.12%
Coal-fired power project in construction [member]
Disclosure of detailed information about property, plant and equipment [line items]
Impairment loss of property, plant and equipment	¥ 242,000

Property, plant and equipmen111

Property, plant and equipment (Property, plant and equipment held under finance leases) (Detail) - CNY (¥) ¥ in Millions	Dec. 31, 2017	Dec. 31, 2016
Property, plant and equipment [abstract]
Original cost	¥ 3,312	¥ 2,075

Property, plant and equipmen112

Property, plant and equipment (Buildings without ownership certificate) (Detail) - CNY (¥) ¥ in Millions	Dec. 31, 2017	Dec. 31, 2016
Property, plant and equipment [abstract]
Aggregate net book value	¥ 10,800	¥ 7,871

Investments in associates an113

Investments in associates and joint ventures (Summary of investments in associates and joint ventures) (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Investments in associates and joint ventures [abstract]
Beginning of the year	¥ 19,632,113	¥ 19,745,192
Capital injections in associates and joint ventures	301,916	276,118
Business combination (Note 40(a))	1,021,566	0
Transfer from available-for-sale	91,800	0
Transfer to subsidiaries	(736,725)	0
Share of net profit less loss	425,215	1,298,889
Share of other comprehensive income/ (loss)	121,208	(180,572)
Currency translation differences	(142,226)	0
Dividends	(835,279)	(1,507,514)
Elimination of unrealized profits on transactions with equity-method investees	(361,965)	0
End of the year	¥ 19,517,623	¥ 19,632,113

Investments in associates an114

Investments in associates and joint ventures (Basic information of material associates and joint ventures) (Detail) - CNY (¥)		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
SECL [member]
Summarized financial information of investments in associates and joint ventures [line items]
Country of incorporation	[1]	PRC
Registered capital	[1]	¥ 2,642,994,398
Business nature and scope of operation	[1]	Energy and investment in related industries
Percentage of equity interest held, Direct	[1]	25.02%
Percentage of equity interest held, Indirect	[1],[2]	0.00%
The fair value of the Company's shares		¥ 6,010,000,000	¥ 6,813,000,000
Hebei Hanfeng Power Generation Limited Liability Company ("Hanfeng Power") [member]
Summarized financial information of investments in associates and joint ventures [line items]
Country of incorporation		PRC
Registered capital		¥ 1,975,000,000
Business nature and scope of operation		Power generation
Percentage of equity interest held, Direct		40.00%
Percentage of equity interest held, Indirect	[2]	0.00%
Huaneng Finance [member]
Summarized financial information of investments in associates and joint ventures [line items]
Country of incorporation		PRC
Registered capital		¥ 5,000,000,000
Business nature and scope of operation		Provision for financial service including fund deposit services, lending, finance lease arrangements, notes discounting and entrusted loans and investment arrangement within Huaneng Group
Percentage of equity interest held, Direct		20.00%
Percentage of equity interest held, Indirect	[2]	0.00%
Huaneng Sichuan Hydropower Co., Ltd. ("Sichuan Hydropower") [member]
Summarized financial information of investments in associates and joint ventures [line items]
Country of incorporation		PRC
Registered capital		¥ 1,469,800,000
Business nature and scope of operation		Development, investment, construction, operation and management of hydropower
Percentage of equity interest held, Direct		49.00%
Percentage of equity interest held, Indirect	[2]	0.00%
China Huaneng Group Fuel Co., Ltd. ("Huaneng Group Fuel Company") [member]
Summarized financial information of investments in associates and joint ventures [line items]
Country of incorporation	[3]	PRC
Registered capital	[3]	¥ 3,000,000,000
Business nature and scope of operation	[3]	Wholesale of coal, import and export of coal
Percentage of equity interest held, Direct	[3]	50.00%
Percentage of equity interest held, Indirect	[2],[3]	0.00%
Hainan Nuclear Power Limited Liability Company ("Hainan Nuclear") [member]
Summarized financial information of investments in associates and joint ventures [line items]
Country of incorporation		PRC
Registered capital		¥ 4,831,460,000
Business nature and scope of operation		Construction and operation of nuclear power plants; production and sales of electricity and related products
Percentage of equity interest held, Direct		30.00%
Percentage of equity interest held, Indirect	[2]	0.00%
Shanghai Time Shipping Co., Ltd. ("Shanghai Time Shipping") [member]
Summarized financial information of investments in associates and joint ventures [line items]
Country of incorporation		PRC
Registered capital		¥ 1,200,000,000
Business nature and scope of operation		International and domestic sea transportation
Percentage of equity interest held, Direct		50.00%
Percentage of equity interest held, Indirect	[2]	0.00%
Jiangsu Nantong Power Generation Co., Ltd. ("Jiangsu Nantong Power") [member]
Summarized financial information of investments in associates and joint ventures [line items]
Country of incorporation		PRC
Registered capital		¥ 1,596,000,000
Business nature and scope of operation		Operation and Management of power generation plants and transportation related projects
Percentage of equity interest held, Direct		0.00%
Percentage of equity interest held, Indirect	[2]	35.00%
Huaneng Shandong Ruyi (Hongkong) Energy Co., Ltd. ("Ruyi (Hongkong) Energy") [member]
Summarized financial information of investments in associates and joint ventures [line items]
Country of incorporation	[4]	Hong Kong
Registered capital	[4]	10,000
Business nature and scope of operation	[4]	Investment in electricity and other related energy projects
Percentage of equity interest held, Direct	[4]	0.00%
Percentage of equity interest held, Indirect	[2],[4]	40.00%
Shandong Luyi Power International Limited Company ("Luyi Power") [member]
Summarized financial information of investments in associates and joint ventures [line items]
Country of incorporation	[4]	PRC
Registered capital	[4]	¥ 35,000,000
Business nature and scope of operation	[4]	Contracting overseas projects and international bidding projects, mechanical and electrical equipment installation engineering and electric power engineering
Percentage of equity interest held, Direct	[4]	0.00%
Percentage of equity interest held, Indirect	[2],[4]	40.00%
[1]	As at 31 December 2017, the fair value of the Company's shares in SECL was RMB6,010 million (2016: RMB6,813 million).
[2]	The indirect percentage of equity interest held represents the effective ownership interest of the Company and its subsidiaries.
[3]	In accordance with the articles of the association of the investee, the Company could only exercise significant influence on the investee and therefore accounts for the investment under the equity method.
[4]	Ruyi (Hongkong) Energy and Luyi Power were established for Pakistan Sahiwal Project, which are jointly controlled by Huaneng Shandong Power Generation Co., Ltd. and Shandong Ruyi Technology Group Co., Ltd.

Investments in associates an115

Investments in associates and joint ventures (Summarized financial information of material associates) (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Gross amounts of the associates'
Current assets	¥ 48,537,710	¥ 36,966,616
Non-current assets	348,051,801	277,873,123
Current liabilities	(155,950,488)	(130,196,251)
Non-current liabilities	(133,024,419)	(82,456,751)
Equity	107,614,604	102,186,737		¥ 101,693,689		¥ 84,782,706
Equity attributable to shareholders	87,641,566	86,002,995
Non-controlling interests	19,973,038	16,183,742
Revenue	152,459,444	113,814,236	[1]	128,904,873	[1]
Profit/ (loss) from continuing operations attributable to shareholders	1,579,836	8,520,427		13,651,933
Total comprehensive income/ (loss) attributable to shareholders	1,023,118	9,005,227		¥ 14,807,889
Sichuan Hydropower [member]
Gross amounts of the associates'
Current assets	1,113,579	1,245,157
Non-current assets	14,590,921	14,676,021
Current liabilities	(2,477,362)	(2,410,462)
Non-current liabilities	(8,661,852)	(8,901,599)
Equity	4,565,286	4,609,117
Equity attributable to shareholders	3,400,953	3,449,824
Non-controlling interests	1,164,333	1,159,293
Revenue	2,247,781	2,053,327
Profit/ (loss) from continuing operations attributable to shareholders	222,403	173,220
Other comprehensive (loss) /income attributable to shareholders	0	0
Total comprehensive income/ (loss) attributable to shareholders	222,403	173,220
Dividend received from the associates	132,923	145,392
Reconciled to the interests in the associates
Gross amounts of net assets attributable to shareholders of the associate	¥ 3,400,953	¥ 3,449,824
The Company's effective interest	49.00%	49.00%
The Company's share of net assets attributable to shareholders of the associate	¥ 1,666,467	¥ 1,690,414
Impact of adjustments	207,586	207,586
Carrying amount in the consolidated financial statements	1,874,053	1,898,000
SECL [member]
Gross amounts of the associates'
Current assets	16,444,934	14,021,440
Non-current assets	56,079,321	46,584,060
Current liabilities	(20,447,190)	(16,564,310)
Non-current liabilities	(28,491,540)	(19,395,060)
Equity	23,585,525	24,646,130
Equity attributable to shareholders	22,285,077	21,610,140
Non-controlling interests	1,300,448	3,035,990
Revenue	13,908,949	11,427,830
Profit/ (loss) from continuing operations attributable to shareholders	747,657	1,362,028
Other comprehensive (loss) /income attributable to shareholders	521,965	(638,680)
Total comprehensive income/ (loss) attributable to shareholders	1,269,622	723,348
Dividend received from the associates	148,761	198,348
Reconciled to the interests in the associates
Gross amounts of net assets attributable to shareholders of the associate	¥ 22,285,077	¥ 21,610,140
The Company's effective interest	25.02%	25.02%
The Company's share of net assets attributable to shareholders of the associate	¥ 5,574,612	¥ 5,405,776
Impact of adjustments	1,161,810	1,161,810
Carrying amount in the consolidated financial statements	6,736,422	6,567,586
Huaneng Finance [member]
Gross amounts of the associates'
Current assets	25,535,504	13,919,342
Non-current assets	20,786,497	18,055,386
Current liabilities	(39,588,213)	(25,344,346)
Non-current liabilities	(49,904)	(57,368)
Equity	6,683,884	6,573,014
Equity attributable to shareholders	6,683,884	6,573,014
Non-controlling interests	0	0
Revenue	1,393,211	1,093,637
Profit/ (loss) from continuing operations attributable to shareholders	718,970	660,089
Other comprehensive (loss) /income attributable to shareholders	(28,099)	(125,840)
Total comprehensive income/ (loss) attributable to shareholders	690,871	534,249
Dividend received from the associates	116,000	122,000
Reconciled to the interests in the associates
Gross amounts of net assets attributable to shareholders of the associate	¥ 6,683,884	¥ 6,573,014
The Company's effective interest	20.00%	20.00%
The Company's share of net assets attributable to shareholders of the associate	¥ 1,336,777	¥ 1,314,603
Impact of adjustments	0	0
Carrying amount in the consolidated financial statements	1,336,777	1,314,603
Hanfeng Power [member]
Gross amounts of the associates'
Current assets	650,055	806,432
Non-current assets	2,246,412	2,616,639
Current liabilities	(795,815)	(1,045,876)
Non-current liabilities	(27,443)	(37,103)
Equity	2,073,209	2,340,092
Equity attributable to shareholders	2,073,209	2,340,092
Non-controlling interests	0	0
Revenue	2,073,209	2,192,445
Profit/ (loss) from continuing operations attributable to shareholders	52,361	290,470
Other comprehensive (loss) /income attributable to shareholders	0	0
Total comprehensive income/ (loss) attributable to shareholders	52,361	290,470
Dividend received from the associates	127,698	174,366
Reconciled to the interests in the associates
Gross amounts of net assets attributable to shareholders of the associate	¥ 2,073,209	¥ 2,340,092
The Company's effective interest	40.00%	40.00%
The Company's share of net assets attributable to shareholders of the associate	¥ 829,284	¥ 936,037
Impact of adjustments	293,082	293,082
Carrying amount in the consolidated financial statements	1,122,366	1,229,119
Huaneng Group Fuel Company [member]
Gross amounts of the associates'
Current assets	4,327,146	4,642,797
Non-current assets	4,102,426	4,269,520
Current liabilities	(1,778,075)	(1,939,210)
Non-current liabilities	(3,119,462)	(3,432,326)
Equity	3,532,035	3,540,781
Equity attributable to shareholders	3,400,344	3,378,952
Non-controlling interests	131,691	161,829
Revenue	17,166,036	14,356,915
Profit/ (loss) from continuing operations attributable to shareholders	48,876	102,363
Other comprehensive (loss) /income attributable to shareholders	(6,654)	8,723
Total comprehensive income/ (loss) attributable to shareholders	42,222	111,086
Dividend received from the associates	10,000	10,000
Reconciled to the interests in the associates
Gross amounts of net assets attributable to shareholders of the associate	¥ 3,400,344	¥ 3,378,952
The Company's effective interest	50.00%	50.00%
The Company's share of net assets attributable to shareholders of the associate	¥ 1,700,172	¥ 1,689,476
Impact of adjustments	16,521	16,521
Carrying amount in the consolidated financial statements	1,716,693	1,705,997
Hainan Nuclear [member]
Gross amounts of the associates'
Current assets	2,497,765	2,608,909
Non-current assets	22,490,989	23,939,921
Current liabilities	(3,409,360)	(3,330,581)
Non-current liabilities	(17,252,794)	(18,356,288)
Equity	4,326,600	4,861,961
Equity attributable to shareholders	4,326,600	4,861,961
Non-controlling interests	0	0
Revenue	2,504,379	1,897,190
Profit/ (loss) from continuing operations attributable to shareholders	(535,361)	18,618
Other comprehensive (loss) /income attributable to shareholders	0	0
Total comprehensive income/ (loss) attributable to shareholders	(535,361)	18,618
Dividend received from the associates	0	0
Reconciled to the interests in the associates
Gross amounts of net assets attributable to shareholders of the associate	¥ 4,326,600	¥ 4,861,961
The Company's effective interest	30.00%	30.00%
The Company's share of net assets attributable to shareholders of the associate	¥ 1,297,980	¥ 1,458,588
Impact of adjustments	14,076	14,076
Carrying amount in the consolidated financial statements	¥ 1,312,056	¥ 1,472,664
[1]	Restated. The Company completed the acquisition of equity interests of four companies from Huaneng Group, see Note 40 for details. As the acquisition is a business combination under common control, the transaction is accounted for under merger accounting method under PRC GAAP. The assets and liabilities acquired in business combinations are measured at the carrying amounts of the acquirees in the consolidated financial statements of the ultimate controlling party on the acquisition date. The operating results for all periods presented are retrospectively restated as if the current structure and operations resulting from the acquisition had been in existence from the date when the acquirees first became under the control of the same ultimate controlling party. Therefore the relevant comparative figures in the segment information were restated under PRC GAAP while the acquisition is accounted for using acquisition method under IFRS.

Investments in associates an116

Investments in associates and joint ventures (Summarized financial information of material joint ventures) (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Gross amounts of joint ventures'
Current assets	¥ 48,537,710	¥ 36,966,616
Non-current assets	348,051,801	277,873,123
Current liabilities	(155,950,488)	(130,196,251)
Non-current liabilities	(133,024,419)	(82,456,751)
Equity	107,614,604	102,186,737		¥ 101,693,689		¥ 84,782,706
Included in the above assets and liabilities:
Cash and cash equivalents	9,282,390	7,810,501		7,478,250		¥ 12,238,367
Revenue	152,459,444	113,814,236	[1]	128,904,873	[1]
Total comprehensive (loss) /income	998,993	10,833,271		18,414,967
Included in the above profit:
Depreciation and amortization	20,635,833	15,162,715	[1]	14,717,613	[1]
Interest income	198,906	147,063		160,723
Interest expense	9,749,004	6,817,526	[1]	7,945,734	[1]
Income tax expense	1,217,526	3,465,151	[1]	¥ 5,698,943	[1]
Shanghai Time Shipping [member]
Gross amounts of joint ventures'
Current assets	665,410	883,120
Non-current assets	4,663,530	5,335,409
Current liabilities	(3,316,709)	(3,177,881)
Non-current liabilities	(617,437)	(1,506,076)
Equity	1,394,794	1,534,572
Included in the above assets and liabilities:
Cash and cash equivalents	96,528	203,018
Current financial liabilities (excluding trade and other payables and provisions)	(2,987,937)	(2,681,857)
Non-current financial liabilities (excluding trade and other payables and provisions)	(617,437)	(1,506,076)
Revenue	3,532,065	3,561,091
(Loss) /profit from continuing operations	(139,780)	1,212
Other comprehensive (loss) /income attributable to shareholders	0	0
Total comprehensive (loss) /income	(139,780)	1,212
Dividend received in cash from the joint ventures	0	275,000
Included in the above profit:
Depreciation and amortization	317,133	340,826
Interest income	1,406	985
Interest expense	157,851	149,748
Income tax expense	(45,741)	500
Reconciled to the interests in the joint venture:
Gross amounts of net assets	¥ 1,394,794	¥ 1,534,572
The Company and its subsidiaries' effective interest	50.00%	50.00%
The Company and its subsidiaries' share of net assets	¥ 697,397	¥ 767,286
Impact of adjustments	18,324	18,324
Carrying amount in the consolidated financial statements	715,721	785,610
Jiangsu Nantong Power [member]
Gross amounts of joint ventures'
Current assets	656,720	815,359
Non-current assets	5,739,860	6,075,100
Current liabilities	(2,939,371)	(2,600,258)
Non-current liabilities	(1,374,656)	(1,931,219)
Equity	2,082,553	2,358,982
Included in the above assets and liabilities:
Cash and cash equivalents	362,214	96,501
Current financial liabilities (excluding trade and other payables and provisions)	(2,404,331)	(2,270,601)
Non-current financial liabilities (excluding trade and other payables and provisions)	(1,352,000)	(1,931,219)
Revenue	3,451,983	3,354,545
(Loss) /profit from continuing operations	271,364	608,660
Other comprehensive (loss) /income attributable to shareholders	0	0
Total comprehensive (loss) /income	271,364	608,660
Dividend received in cash from the joint ventures	724,453	0
Included in the above profit:
Depreciation and amortization	396,500	393,221
Interest income	1,810	2,313
Interest expense	130,028	128,224
Income tax expense	92,294	194,915
Reconciled to the interests in the joint venture:
Gross amounts of net assets	¥ 2,082,553	¥ 2,358,982
The Company and its subsidiaries' effective interest	50.00%	50.00%
The Company and its subsidiaries' share of net assets	¥ 1,041,277	¥ 1,179,491
Impact of adjustments	0	0
Carrying amount in the consolidated financial statements	1,041,277	¥ 1,179,491
Pakistan Sahiwal Project Related Investment [member]
Gross amounts of joint ventures'
Current assets	3,069,065
Non-current assets	9,775,693
Current liabilities	(1,955,211)
Non-current liabilities	(8,738,121)
Equity	2,151,426
Included in the above assets and liabilities:
Cash and cash equivalents	618,105
Current financial liabilities (excluding trade and other payables and provisions)	(1,482,269)
Non-current financial liabilities (excluding trade and other payables and provisions)	(8,738,121)
Revenue	2,321,510
(Loss) /profit from continuing operations	(72,227)
Other comprehensive (loss) /income attributable to shareholders	(284,452)
Total comprehensive (loss) /income	(356,679)
Dividend received in cash from the joint ventures	0
Included in the above profit:
Depreciation and amortization	63,122
Interest income	10
Interest expense	104,467
Income tax expense	224,146
Reconciled to the interests in the joint venture:
Gross amounts of net assets	¥ 2,151,426
The Company and its subsidiaries' effective interest	50.00%
The Company and its subsidiaries' share of net assets	¥ 1,075,713
Impact of adjustments	(361,965)
Carrying amount in the consolidated financial statements	¥ 713,748
[1]	Restated. The Company completed the acquisition of equity interests of four companies from Huaneng Group, see Note 40 for details. As the acquisition is a business combination under common control, the transaction is accounted for under merger accounting method under PRC GAAP. The assets and liabilities acquired in business combinations are measured at the carrying amounts of the acquirees in the consolidated financial statements of the ultimate controlling party on the acquisition date. The operating results for all periods presented are retrospectively restated as if the current structure and operations resulting from the acquisition had been in existence from the date when the acquirees first became under the control of the same ultimate controlling party. Therefore the relevant comparative figures in the segment information were restated under PRC GAAP while the acquisition is accounted for using acquisition method under IFRS.

Investments in associates an117

Investments in associates and joint ventures (Disclosure of aggregated information of individually immaterial associates and joint ventures) (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Aggregate amounts of the Company and its subsidiaries' share of those associates and joint ventures
Unrecognized further losses	¥ 185,000	¥ 163,000
Individually immaterial associates and joint ventures [member]
Summarized financial information of investments in associates and joint ventures [line items]
Aggregate carrying amount of individually immaterial associates and joint ventures in the consolidated financial statements	2,948,510	3,479,043
Aggregate amounts of the Company and its subsidiaries' share of those associates and joint ventures
Profit from continuing operations	70,965	263,392
Total comprehensive income	¥ 70,965	¥ 263,392

Investments in subsidiaries (Su

Investments in subsidiaries (Subsidiaries acquired through establishment or investment) (Detail)	12 Months Ended
	Dec. 31, 2017CNY (¥)shares		Dec. 31, 2017SGD ($)shares
Huaneng International Power Fuel Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 200,000,000
Business nature and scope of operations	Wholesale of coal
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Shanghai Shidongkou Power Generation Limited Liability Company ("Shidongkou Power") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[1]
Type of interest held	held directly	[1]
Registered capital	¥ 1,179,000,000	[1]
Business nature and scope of operations	Power generation	[1]
Percentage of equity interest held, Interest	50.00%	[1]
Percentage of equity interest held, Voting	100.00%	[1]
Huaneng Nantong Power Generation Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 798,000,000
Business nature and scope of operations	Power generation
Percentage of equity interest held, Interest	70.00%
Percentage of equity interest held, Voting	70.00%
Huaneng Yingkou Co-generation Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 844,030,000
Business nature and scope of operations	Production and sales of electricity and heat sale of coal ash and lime
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Hunan Xiangqi Hydropower Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 328,000,000
Business nature and scope of operations	Construction, operation and management of hydropower plants and related projects
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Zuoquan Coal-fired Power Generation Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 960,000,000
Business nature and scope of operations	Construction, operation and management of electricity projects; Development and utilization of clean energy resources
Percentage of equity interest held, Interest	80.00%
Percentage of equity interest held, Voting	80.00%
Huaneng Kangbao Wind Power Utilization Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 407,200,000
Business nature and scope of operations	Construction, operation and management of wind power plants and related projects; solar power generation
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Jiuquan Wind Power Generation Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 2,600,000,000
Business nature and scope of operations	Construction, operation and management of wind power generation and related projects
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Jiuquan II Wind Power Generation Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 10,000,000
Business nature and scope of operations	Construction, operation and management of wind power generation and related projects
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Wafangdian Wind Power Generation Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 50,000,000
Business nature and scope of operations	Construction, operation and management of wind power generation and related projects
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Changtu Wind Power Generation Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 50,000,000
Business nature and scope of operations	Construction, operation and management of wind power generation and related projects
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Rudong Wind Power Generation Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 90,380,000
Business nature and scope of operations	Operation, management of wind power generation projects
Percentage of equity interest held, Interest	90.00%
Percentage of equity interest held, Voting	90.00%
Huaneng Guangdong Haimen Port Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 331,400,000
Business nature and scope of operations	Loading, warehousing and conveying services, providing facility services and water transportation services
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Taicang Port Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 600,000,000
Business nature and scope of operations	Port provision, cargo loading and storage
Percentage of equity interest held, Interest	85.00%
Percentage of equity interest held, Voting	85.00%
Huaneng Taicang Power Generation Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 804,146,700
Business nature and scope of operations	Power generation
Percentage of equity interest held, Interest	75.00%
Percentage of equity interest held, Voting	75.00%
Huaneng Huaiyin II Power Generation Limited Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 930,870,000
Business nature and scope of operations	Power generation
Percentage of equity interest held, Interest	63.64%
Percentage of equity interest held, Voting	63.64%
Huaneng Xindian Power Generation Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 465,600,000
Business nature and scope of operations	Power generation
Percentage of equity interest held, Interest	95.00%
Percentage of equity interest held, Voting	95.00%
Huaneng Shanghai Combined Cycle Power Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 699,700,000
Business nature and scope of operations	Power generation
Percentage of equity interest held, Interest	70.00%
Percentage of equity interest held, Voting	70.00%
Huaneng Yumen Wind Power Generation Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 719,170,000
Business nature and scope of operations	Construction, operation and management of wind power generation and related projects
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Qingdao Co-generation Limited Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 214,879,000
Business nature and scope of operations	Construction, operation and management of co-generation power plants and related projects
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Tongxiang Combined Cycle Co-generation Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 300,000,000
Business nature and scope of operations	Production and sales of electricity and heat; investment in combined cycle co-generation industries
Percentage of equity interest held, Interest	95.00%
Percentage of equity interest held, Voting	95.00%
Huaneng Eastern Yunnan Energy Mine Construction Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held indirectly
Registered capital	¥ 10,000,000
Business nature and scope of operations	Mine engineering, construction engineering, equipment installation engineering
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Nanjing Combined Cycle Co-generation Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 582,000,000
Business nature and scope of operations	Construction, operation and management of power plants and related projects
Percentage of equity interest held, Interest	60.00%
Percentage of equity interest held, Voting	60.00%
Huaneng Shantou Haimen Power Generation Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 1,508,000,000
Business nature and scope of operations	Construction, operation and management of power plants and related projects
Percentage of equity interest held, Interest	80.00%
Percentage of equity interest held, Voting	80.00%
Huaneng Chongqing Liangjiang Power Generation Limited Liability Company ("Liangjiang Power") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 726,600,000
Business nature and scope of operations	Construction, operation and management of natural gas power plants and related projects
Percentage of equity interest held, Interest	90.00%
Percentage of equity interest held, Voting	90.00%
Chongqing Huaqing Energy Co., Ltd. ("Huaqing Energy") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[2]
Type of interest held	held indirectly	[2]
Registered capital	¥ 44,420,000	[2]
Business nature and scope of operations	Providing thermal energy and cold energy services; supplying electricity	[2]
Percentage of equity interest held, Interest	54.00%	[2]
Percentage of equity interest held, Voting	60.00%	[2]
Huaneng Yunnan Fuyuan Wind Power Generation Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 157,290,000
Business nature and scope of operations	Wind power project investment, management and sales
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Guizhou Panxian Wind Power Generation Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 86,500,000
Business nature and scope of operations	Construction and management of wind power plants and related projects
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Jiangxi Clean Energy Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 5,000,000
Business nature and scope of operations	Power generation and supply, development, management and construction of clean energy projects
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Suzhou Combined Cycle Co-generation Co., Ltd. ("Suzhou Combined Cycle Co-generation") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[3]
Type of interest held	held indirectly	[3]
Registered capital	¥ 310,000,000	[3]
Business nature and scope of operations	Construction and management of natural gas power plant and related projects	[3]
Percentage of equity interest held, Interest	53.45%	[3]
Percentage of equity interest held, Voting	100.00%	[3]
Huaneng Hunan Subaoding Wind Power Generation Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 266,000,000
Business nature and scope of operations	Construction, operation and management of wind power plants and related projects
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Suixian Jieshan Wind Power Generation Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 96,500,000
Business nature and scope of operations	Construction, operation and management of wind power plants and related projects
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Taiyuan Dongshan Combined Cycle Co-generation Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 600,000,000
Business nature and scope of operations	Construction and operation of thermal heating network, development and utilization of clean energy resources
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Xuzhou Tongshan Wind Power Generation Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 2,644,560,000
Business nature and scope of operations	Wind power generation, electricity engineering design services, maintenance of power supply and control facilities, solar energy power generation
Percentage of equity interest held, Interest	70.00%
Percentage of equity interest held, Voting	70.00%
Huaneng Nanjing Co-generation Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 300,000,000
Business nature and scope of operations	Construction and operation of power plants, thermal heating services
Percentage of equity interest held, Interest	70.00%
Percentage of equity interest held, Voting	70.00%
Huaneng Hunan Guidong Wind Power Generation Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 140,000,000
Business nature and scope of operations	Investment, construction, operation and management of electricity projects; development and utilization of clean energy resources
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Nanjing Luhe Wind Power Generation Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 63,800,000
Business nature and scope of operations	Investment, construction, operation, management of electricity projects; development and utilization clean energy resources
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Luoyuan Power Generation Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 1,000,000,000
Business nature and scope of operations	Construction, operation and management of power plants and related projects
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Lingang (Tianjin) Gas Co-generation Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 180,000,000
Business nature and scope of operations	Providing generation and supply
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Lingang (Tianjin) Heat Co-generation Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held indirectly
Registered capital	¥ 5,000,000
Business nature and scope of operations	Providing thermal energy and cold energy services, supplying steam and hot water(except portable water), plumbing pipe installation and repair, energy engineering construction
Percentage of equity interest held, Interest	66.00%
Percentage of equity interest held, Voting	66.00%
Huaneng Anhui Huaining Wind Power Generation Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 122,000,000
Business nature and scope of operations	Investment, construction and operation of electricity projects, development and utilization of clean energy resources
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Mianchi Co-generation Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 570,000,000
Business nature and scope of operations	Construction, operation and management of coal-fired plants and related projects
Percentage of equity interest held, Interest	60.00%
Percentage of equity interest held, Voting	60.00%
Huaneng Yingkou Xianrendao Co-generation Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 277,690,000
Business nature and scope of operations	Power generation and supply, development and utilization of clean energy resources
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Nanjing Xingang Comprehensive Energy Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 10,000,000
Business nature and scope of operations	Thermal generation and supply, power distribution and sales
Percentage of equity interest held, Interest	65.00%
Percentage of equity interest held, Voting	65.00%
Huaneng Changxing Photovoltaic Power Generation Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 16,000,000
Business nature and scope of operations	Construction and operation of distributed photovoltaic power generation plants and related projects
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Rudong Baxianjiao Offshore Wind Power Generation Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 610,000,000
Business nature and scope of operations	Infrastructure construction of wind power plants
Percentage of equity interest held, Interest	70.00%
Percentage of equity interest held, Voting	70.00%
Huaneng Guilin Gas Distributed Energy Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 267,450,000
Business nature and scope of operations	Construction, operation and management of power plants thermal management and related projects
Percentage of equity interest held, Interest	80.00%
Percentage of equity interest held, Voting	80.00%
Huaneng (Dalian) Co-generation Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 12,500,000
Business nature and scope of operations	Construction, operation and management of co-generation power plants and related projects
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Zhongxiang Wind Power Generation Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 10,000,000
Business nature and scope of operations	Construction, operation and management of wind power plants and related projects
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Guanyun Co-generation Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 15,000,000
Business nature and scope of operations	Construction, operation and management of co-generation power plants, heating network and expansion engineering
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng International Power Hongkong Limited Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	Hong Kong
Type of interest held	held directly
Registered capital | shares	100,000		100,000
Business nature and scope of operations	Development, construction management and operation of power supply, coal projects; related investment and financing businesses
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Tuas Power Generation Pte. Ltd. ("TPG") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	Singapore
Type of interest held	held indirectly
Registered capital | $			$ 1,183,000,001
Business nature and scope of operations	Power generation and related by-products, derivatives, developing power supply resources, operating electricity and power sales
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
TP Utilities Pte. Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation	Singapore
Type of interest held	held indirectly
Registered capital | $			255,500,001
Business nature and scope of operations	Provision of energy, power supply, thermal supply, management of industrial water and waste
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
TP-STM Water Resources Pte. Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation	Singapore
Type of interest held	held indirectly
Registered capital | $			$ 4,500,000
Business nature and scope of operations	Providing desalinated water
Percentage of equity interest held, Interest	60.00%
Percentage of equity interest held, Voting	60.00%
Huaneng Shanxi Taihang Power Generation Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 1,086,440,000
Business nature and scope of operations	Pre-services related to coal-fired generation
Percentage of equity interest held, Interest	60.00%
Percentage of equity interest held, Voting	60.00%
Huaneng Mianchi Clean Energy Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 10,000,000
Business nature and scope of operations	Wind Power generation, new energy development and utilization
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Zhuolu Clean Energy Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 78,878,100
Business nature and scope of operations	Construction, operation and management of power plants and related projects
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Tongwei Wind Power Generation Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 248,000,000
Business nature and scope of operations	Construction, operation and management of wind power plants and related projects
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Yizheng Wind Power Generation Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 200,000,000
Business nature and scope of operations	Wind power plants design, construction, management and maintenance
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Yancheng Dafeng New Energy Power Generation Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 5,000,000
Business nature and scope of operations	Construction, operation and management of wind power, photovoltaic power plant
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Shanyin Power Generation Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 1,573,000,000
Business nature and scope of operations	Construction, operation and management of power plants and related projects
Percentage of equity interest held, Interest	51.00%
Percentage of equity interest held, Voting	51.00%
Huaneng Jiangsu Energy Sales Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 200,000,000
Business nature and scope of operations	Purchase and sales of electricity and thermal energy, water supply services, construction and operation of electricity distribution network and heating pipe network
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Liaoning Energy Sales Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 200,000,000
Business nature and scope of operations	Sales of electricity, thermal energy and circulating hot water
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Guangdong Energy Sales Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 200,000,000
Business nature and scope of operations	Power and thermal supply, energy conservation energy technology service, transmission and substation projects contracting
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Suizhou Power Generation Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 50,000,000
Business nature and scope of operations	Construction, operation and management of power plants, production and sales of electricity and heating
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Changle Photovoltaic Power Generation Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 10,000,000
Business nature and scope of operations	Construction, operation and management of photovoltaic power plants and related projects
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Longyan Wind Power Generation Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 10,000,000
Business nature and scope of operations	Construction, operation and management of wind power plants and related projects
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Yunnan Malong Wind Power Generation Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 10,000,000
Business nature and scope of operations	Construction, operation and management of wind power plants and related projects
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Dandong Photovoltaic Power Generation Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 17,720,000
Business nature and scope of operations	Investment, construction operation and management of electricity projects, development and utilization of clean energy resources
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Dongguan Combined Cycle Co-generation Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 50,000,000
Business nature and scope of operations	Investment of electricity projects, thermal power generation and supply, investment in heating pipe network, development and utilization of clean energy resources
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Yangxi Photovoltaic Power Generation Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 62,500,000
Business nature and scope of operations	Photovoltaic electric power production and sales
Percentage of equity interest held, Interest	80.00%
Percentage of equity interest held, Voting	80.00%
Huaneng Chongqing Fengjie Wind Power Generation Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 10,000,000
Business nature and scope of operations	Electricity production and supply; development and utilization of clean energy resources
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Changxing Hongqiao Photovoltaic Power Generation Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 10,000,000
Business nature and scope of operations	Electricity production and supply; development and utilization of clean energy resources
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Jingxing Photovoltaic Power Generation Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 100,000
Business nature and scope of operations	Investment, construction and management of photovoltaic power plants
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Shanxi Energy Sales Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 210,000,000
Business nature and scope of operations	Electricity supply and sales, investment, construction, operation and repair of regional transmission and distribution network
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Chongqing Energy Sales Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 210,000,000
Business nature and scope of operations	Operation of natural gas, electric energy and thermal energy products sales
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Chongqing Luohuang Energy Sales Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held indirectly
Registered capital	¥ 210,000,000
Business nature and scope of operations	Sales and supply of electricity, sales of thermal products
Percentage of equity interest held, Interest	90.00%
Percentage of equity interest held, Voting	90.00%
Huaneng Chongqing Tongliang Energy Sales Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held indirectly
Registered capital	¥ 210,000,000
Business nature and scope of operations	Operation of natural gas, sales of electricity supply, sales of thermal products
Percentage of equity interest held, Interest	51.00%
Percentage of equity interest held, Voting	51.00%
Huaneng Hunan Energy Sales Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 210,000,000
Business nature and scope of operations	Electricity and thermal energy products sales
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Jiangxi Energy Sales Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 210,000,000
Business nature and scope of operations	Construction, operation and management of heating and power supply facilities
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Hebei Energy Sales Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 210,000,000
Business nature and scope of operations	Construction, installation, maintenance and repair of heating and power supply facilities
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Henan Energy Sales Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 210,000,000
Business nature and scope of operations	Sales of electricity, heating, gas and other energy products
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Handan Heating Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 100,000,000
Business nature and scope of operations	Construction, operation and maintenance of heating sources and pipe network
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng (Huzhou Development Zone) Photovoltaic Power Generation Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 10,000,000
Business nature and scope of operations	Photovoltaic power generation; power supply, purchase and sales
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Fujian Energy Sales Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 210,000,000
Business nature and scope of operations	Sales of electricity, heating, gas and other energy products
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Hubei Energy Sales Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 210,000,000
Business nature and scope of operations	Sales of electricity, heating, gas and other energy products
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng (Sanming) Clean Energy Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 500,000
Business nature and scope of operations	Construction, operation and management of wind power, photovoltaic power station and related projects
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Yueyang Xingang Photovoltaic Power Generation Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 16,000,000
Business nature and scope of operations	Construction, operation and management of electricity projects, development and utilization of clean energy
Percentage of equity interest held, Interest	60.00%
Percentage of equity interest held, Voting	60.00%
Huaneng Shanghai Energy Sales Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 210,000,000
Business nature and scope of operations	Power supply (except construction and operation of electricity network), technology services in energy conservation and environmental protection
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Yushe Photovoltaic Power Generation Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 10,000,000
Business nature and scope of operations	Production and supply of electric power
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Anhui Energy Sales Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 210,000,000
Business nature and scope of operations	Sales of electricity, heating gas and other energy products
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng (Shanghai) Power Maintenance Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 200,000,000
Business nature and scope of operations	Contracting installation and repair of electricity facilities
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Guanyun Clean Energy Power Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held directly	[4]
Registered capital	¥ 26,000,000	[4]
Business nature and scope of operations	Sales of electricity	[4]
Percentage of equity interest held, Interest	100.00%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Huaneng Jianchang Photovoltaic Power Generation Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held directly	[4]
Registered capital	¥ 10,000,000	[4]
Business nature and scope of operations	Production and supply of electricity, development and utilization of clean energy resources	[4]
Percentage of equity interest held, Interest	100.00%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Huaneng Chaoyang Photovoltaic Power Generation Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held directly	[4]
Registered capital	¥ 10,000,000	[4]
Business nature and scope of operations	Production and supply of electricity, development and utilization of clean energy resources	[4]
Percentage of equity interest held, Interest	100.00%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Huaneng (Luoyuan) Port Limited Company (x) [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4],[5]
Type of interest held	held directly	[4],[5]
Registered capital	¥ 169,710,000	[4],[5]
Business nature and scope of operations	Port management, investment and development	[4],[5]
Percentage of equity interest held, Interest	100.00%	[4],[5]
Percentage of equity interest held, Voting	100.00%	[4],[5]
Huaneng Shijiazhuang Energy Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held directly	[4]
Registered capital	¥ 60,000,000	[4]
Business nature and scope of operations	Production and supply of heating, purchase and sales of electricity	[4]
Percentage of equity interest held, Interest	66.60%	[4]
Percentage of equity interest held, Voting	66.60%	[4]
Huaneng Jiangyin Combined Cycle Co-generation Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held directly	[4]
Registered capital	¥ 600,000,000	[4]
Business nature and scope of operations	Production and supply of electricity, production and supply of heating	[4]
Percentage of equity interest held, Interest	51.00%	[4]
Percentage of equity interest held, Voting	51.00%	[4]
Huaneng Anyang Energy Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held directly	[4]
Registered capital	¥ 10,000,000	[4]
Business nature and scope of operations	Production and supply of electricity, production and supply of heating	[4]
Percentage of equity interest held, Interest	100.00%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Huaneng Shanxi Comprehensive Energy Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held directly	[4]
Registered capital	¥ 120,000,000	[4]
Business nature and scope of operations	Production and supply of electricity, production and supply of heating	[4]
Percentage of equity interest held, Interest	100.00%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Huaneng Zhanhua Photovoltaic Power Generation Limited Company ("Zhanhua Photovoltaic Company") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4],[6]
Type of interest held	held indirectly	[4],[6]
Registered capital	¥ 145,790,000	[4],[6]
Business nature and scope of operations	Photovoltaic power generation	[4],[6]
Percentage of equity interest held, Interest	46.40%	[4],[6]
Percentage of equity interest held, Voting	58.00%	[4],[6]
Huaneng Weishan New Energy Limited Company ("Weishan New Energy") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4],[6]
Type of interest held	held indirectly	[4],[6]
Registered capital	¥ 167,000,000	[4],[6]
Business nature and scope of operations	Investment, production and sales of new energy power generation projects	[4],[6]
Percentage of equity interest held, Interest	40.00%	[4],[6]
Percentage of equity interest held, Voting	100.00%	[4],[6]
Huaneng Ruyi (Helan) New Energy Limited Company ("Helan New Energy") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4],[6]
Type of interest held	held indirectly	[4],[6]
Registered capital	¥ 19,000,000	[4],[6]
Business nature and scope of operations	Photovoltaic power generation	[4],[6]
Percentage of equity interest held, Interest	40.00%	[4],[6]
Percentage of equity interest held, Voting	100.00%	[4],[6]
Huaneng Dezhou New Energy Limited Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4],[6]
Type of interest held	held indirectly	[4],[6]
Registered capital	¥ 2,500,000	[4],[6]
Business nature and scope of operations	Photovoltaic power generation, wind power generation, biomass power generation	[4],[6]
Percentage of equity interest held, Interest	80.00%	[4],[6]
Percentage of equity interest held, Voting	100.00%	[4],[6]
Zhaodong Huaneng Dechang Solar Power Generation Limited Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held indirectly	[4]
Registered capital	¥ 30,810,000	[4]
Business nature and scope of operations	Solar energy generation and technology promotion, repair electricity facilities	[4]
Percentage of equity interest held, Interest	100.00%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Daqing Huaneng Shuangyu Solar Power Generation Limited Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held indirectly	[4]
Registered capital	¥ 20,000,000	[4]
Business nature and scope of operations	Solar energy generation	[4]
Percentage of equity interest held, Interest	100.00%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Huaneng Taizhouwan Juji District Photovoltaic Power Generation Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held directly	[4]
Registered capital	¥ 100,000	[4]
Business nature and scope of operations	Production and supply of electricity projects	[4]
Percentage of equity interest held, Interest	100.00%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Huaneng Mingguang Wind Power Generation Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held directly	[4]
Registered capital	¥ 10,000,000	[4]
Business nature and scope of operations	Production and supply of electricity; investment, construction, operation and management of electricity projects	[4]
Percentage of equity interest held, Interest	100.00%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Huaneng Guangxi Energy Sales Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held directly	[4]
Registered capital	¥ 210,000,000	[4]
Business nature and scope of operations	Power supply, contracting installation and repair of electricity facilities	[4]
Percentage of equity interest held, Interest	100.00%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Huaneng Ruzhou Clean Energy Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held directly	[4]
Registered capital	¥ 80,000,000	[4]
Business nature and scope of operations	Production and supply of investment, electricity projects, construction and operation of electricity projects	[4]
Percentage of equity interest held, Interest	95.00%	[4]
Percentage of equity interest held, Voting	95.00%	[4]
Huaneng Hunan Lianping Wind Power Generation Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held directly	[4]
Registered capital	¥ 173,920,000	[4]
Business nature and scope of operations	Production and supply of electricity	[4]
Percentage of equity interest held, Interest	80.00%	[4]
Percentage of equity interest held, Voting	80.00%	[4]
Huaneng Abagaqi Clean Energy Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held directly	[4]
Registered capital	¥ 100,000	[4]
Business nature and scope of operations	Production, supply and sales of electricity and thermal energy	[4]
Percentage of equity interest held, Interest	100.00%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Huaneng Jiashan Photovoltaic Power Generation Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held directly	[4]
Registered capital	¥ 10,000,000	[4]
Business nature and scope of operations	Production and supply of electricity	[4]
Percentage of equity interest held, Interest	100.00%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Huaneng Zhejiang Energy Sales Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held directly	[4]
Registered capital	¥ 210,000,000	[4]
Business nature and scope of operations	New energy technology development, technology consulting, transferring of results	[4]
Percentage of equity interest held, Interest	100.00%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Huaneng Guangdong Shantou Power Generation Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held directly	[4]
Registered capital	¥ 10,000,000	[4]
Business nature and scope of operations	Production and supply of electricity and thermal energy	[4]
Percentage of equity interest held, Interest	100.00%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Huaneng Shantou Photovoltaic Power Generation Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held directly	[4]
Registered capital	¥ 100,000	[4]
Business nature and scope of operations	Production and supply of electricity	[4]
Percentage of equity interest held, Interest	100.00%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Huaneng Guigang Clean Energy Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held directly	[4]
Registered capital	¥ 10,000,000	[4]
Business nature and scope of operations	Production and supply of electricity, investment, construction and operation of electricity projects	[4]
Percentage of equity interest held, Interest	100.00%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Huaneng Changxing Jiapu Photovoltaic Power Generation Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held directly	[4]
Registered capital	¥ 10,000,000	[4]
Business nature and scope of operations	Production and supply of electricity, investment in electricity projects	[4]
Percentage of equity interest held, Interest	100.00%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Huaneng Hainan Energy Sales Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held indirectly	[4]
Registered capital	¥ 210,000,000	[4]
Business nature and scope of operations	Construction and operation of heat and power supply facilities, operation of heat resources, heat network and power supply facilities	[4]
Percentage of equity interest held, Interest	91.80%	[4]
Percentage of equity interest held, Voting	91.80%	[4]
Huaneng Yangpu Co-generation Limited Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held indirectly	[4]
Registered capital	¥ 802,222,000	[4]
Business nature and scope of operations	Investment, construction operation and management of electricity projects and heat pipe network	[4]
Percentage of equity interest held, Interest	82.62%	[4]
Percentage of equity interest held, Voting	82.62%	[4]
[1]	According to its article of association, the other shareholder who holds the remaining equity interests of Shidongkou Power entrusts the Company to exercise all its voting rights in relation to the operation and financial policies of Shidongkou Power. Accordingly, the Company has control over Shidongkou Power.
[2]	The Company holds 90% interest in Liangjiang Power, and Liangjiang Power holds 60% interest in Huaqing Energy. Therefore, the company indirectly holds 54% equity interest in Huaqing Energy.
[3]	Suzhou Combined Cycle Co-generation Limited Company was acquired by Suzhou Thermal Power, another subsidiary of the Company, which was accounted for as an equity transaction, resulting in reclassification of RMB28 million from non-controlling interest to reserve.
[4]	These companies were newly established in 2017.
[5]	The Company acquired 49% non-controlling interests of Huaneng (Luoyuan) Port Limited Company from the other equity holder, which was accounted for as equity transaction, with the difference of RMB4 million between consideration paid and derecognised non-controlling interest recorded in reserve.
[6]	These companies are subsidiaries of Shandong Power. The Company holds 80% interest in Shandong Power. Thus, the Company indirectly holds 80% interest in these companies through their parent company. Zhanhua Photovoltaic Company is a newly established subsidiary of Shandong Power in 2017. Zhanhua New Energy, a wholly-owned subsidiary of Shandong Power, holds 58% equity interests in Zhanhua Photovoltaic Company. Thus, the Company indirectly holds 46.4% equity interests in Zhanhua Photovoltaic Company. Weishan New Energy and Helan New Energy are wholly-owned subsidiaries of Ruyi Coal Power, a 50% owned subsidiary of Shandong Power. As a result, the Company indirectly holds 40% interest in Weishan New Energy and Helan New Energy. Shandong Power directly holds 58% interest in Shandong Fuel Company and Shandong Maintenance Company; meanwhile, Shandong Power indirectly holds a total of 37.68% equity interests in Shandong Fuel Company and Shandong Maintenance Company respectively through its own subsidiaries: Baiyanghe Power, Huangtai Power, Yantai Power, Linyi Power, Liaocheng Co-generation and Yunhe Power. Thus, the Company indirectly holds 76.55% interest in Shandong Maintenance Company and Shandong Fuel Company respectively. The Company directly holds 44% equity interests in Rizhao Power and Shandong Power directly holds 56% interest in Rizhao Power; Thus, the Company holds 88.8% interest in Rizhao Power; Jiaxiang Power, Qufu Co-generation, Jining Co-generation are wholly-owned subsidiaries of Ruyi Coal Power. Thus, the Company indirectly holds 40% interest in Ruyi Coal Power, Jiaxiang Power, Qufu Co-generation and Jining Co-generation; In according to the voting in concert agreement entered into among the Shandong Power and other equity holders of Laiwu Power, Ruyi Coal Power, Rongcheng New Energy, Liaocheng Co-generation, the other equity holders agreed to vote the same in respect of significant financial and operating decisions made by the Shandong Power. As a result, the Company has control over these companies.

Investments in subsidiaries 119

Investments in subsidiaries (Subsidiaries acquired from business combinations under common control) (Detail)	12 Months Ended
	Dec. 31, 2017CNY (¥)shares
Huaneng (Suzhou Industrial Park) Power Generation Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 632,840,000
Business nature and scope of operation	Power generation
Percentage of equity interest held, Interest	75.00%
Percentage of equity interest held, Voting	75.00%
Huaneng Qinbei Power Generation Co., Ltd. ("Qinbei Power") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 1,540,000,000
Business nature and scope of operation	Power generation
Percentage of equity interest held, Interest	60.00%
Percentage of equity interest held, Voting	60.00%
Huaneng Yushe Power Generation Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 615,760,000
Business nature and scope of operation	Power generation, power distribution, sales of power
Percentage of equity interest held, Interest	60.00%
Percentage of equity interest held, Voting	60.00%
Huaneng Hunan Yueyang Power Generation Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 1,935,000,000
Business nature and scope of operation	Power generation
Percentage of equity interest held, Interest	55.00%
Percentage of equity interest held, Voting	55.00%
Huaneng Chongqing Luohuang Power Generation Limited Liability Company ("Luohuang Power") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 1,748,310,000
Business nature and scope of operation	Power generation
Percentage of equity interest held, Interest	60.00%
Percentage of equity interest held, Voting	60.00%
Huaneng Pingliang Power Generation Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 924,050,000
Business nature and scope of operation	Power generation
Percentage of equity interest held, Interest	65.00%
Percentage of equity interest held, Voting	65.00%
Huaneng Nanjing Jinling Power Generation Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 1,513,136,000
Business nature and scope of operation	Power generation
Percentage of equity interest held, Interest	60.00%
Percentage of equity interest held, Voting	60.00%
Huaneng Qidong Wind Power Generation Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 391,738,500
Business nature and scope of operation	Development of wind power projects, production and sales of electricity
Percentage of equity interest held, Interest	65.00%
Percentage of equity interest held, Voting	65.00%
Tianjin Huaneng Yangliuqing Co-generation Limited Liability Company ("Yangliuqing Co-generation") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 1,537,130,909
Business nature and scope of operation	Power generation, heat supply, facilities installation, maintenance and related services
Percentage of equity interest held, Interest	55.00%
Percentage of equity interest held, Voting	55.00%
Huaneng Beijing Co-generation Limited Liability Company ("Beijing Co-generation") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[1]
Type of interest held	held directly	[1]
Registered capital	¥ 3,702,090,000	[1]
Business nature and scope of operation	Construction and operation of power plants and related construction projects	[1]
Percentage of equity interest held, Interest	41.00%	[1]
Percentage of equity interest held, Voting	66.00%	[1]
Huaneng Wuhan Power Generation Co., Ltd. ("Wuhan Power") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 1,478,461,500
Business nature and scope of operation	Investment, construction, operation and management of electricity projects, development and utilization of clean energy resources
Percentage of equity interest held, Interest	75.00%
Percentage of equity interest held, Voting	75.00%
Huaneng Anyuan Power Generation Co., Ltd. ("Anyuan Power") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 1,175,117,300
Business nature and scope of operation	Construction and operation of power plants and related construction projects, Production of electricity
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Hualiangting Hydropower Co., Ltd. ("Hualiangting Hydropower") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 50,000,000
Business nature and scope of operation	Generation and transfer of power supply, water supply (irrigation)
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Chaohu Power Generation Co., Ltd. ("Chaohu Power") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[2]
Type of interest held	held directly	[2]
Registered capital	¥ 840,000,000	[2]
Business nature and scope of operation	Construction, operation, management of electricity projects, development and utilization of clean energy resources	[2]
Percentage of equity interest held, Interest	60.00%	[2]
Percentage of equity interest held, Voting	70.00%	[2]
Huaneng Jingmen Thermal Power Co., Ltd. ("Jingmen Thermal Power") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 780,000,000
Business nature and scope of operation	Thermal power, power development and other service
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Enshi Qingjiang Dalongtan Hydropower Development Co., Ltd. ("Dalongtan Hydropower") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 76,000,000
Business nature and scope of operation	Hydropower development, production and management of electric power, urban water supply
Percentage of equity interest held, Interest	97.00%
Percentage of equity interest held, Voting	97.00%
Huaneng Suzhou Thermal Power Co., Ltd. ("Suzhou Thermal Power") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[3]
Type of interest held	held directly	[3]
Registered capital	¥ 600,000,000	[3]
Business nature and scope of operation	Construction, operation and management of electricity projects, development and utilization of clean energy	[3]
Percentage of equity interest held, Interest	53.45%	[3]
Percentage of equity interest held, Voting	100.00%	[3]
Huaneng Hainan Power Generation Limited Company ("Hainan Power") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 1,326,419,587
Business nature and scope of operation	Investment, construction operation of various power plants, regular energy and new energy development
Percentage of equity interest held, Interest	91.80%
Percentage of equity interest held, Voting	91.80%
Huaneng Ruijin Power Generation Co., Ltd. ("Ruijin Power Generation") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 536,923,299
Business nature and scope of operation	Construction, operation, management of electricity projects, development and utilization of clean energy
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Yingcheng Thermal Power Co., Ltd. ("Yingcheng Thermal Power") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 650,000,000
Business nature and scope of operation	Construction and operation of power plants and production, sales of power and heat
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Heilongjiang Power Generation Limited Company ("Heilongjiang Power") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 783,350,000
Business nature and scope of operation	Development, investment, construction, production and management of power (thermal) projects
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Hegang Power Generation Limited Company ("Hegang Power") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held indirectly
Registered capital	¥ 1,092,550,000
Business nature and scope of operation	The electricity power construction, energy conservation and development projects, heat production and supply
Percentage of equity interest held, Interest	64.00%
Percentage of equity interest held, Voting	64.00%
Huaneng Xinhua Power Generation Limited Liability Company ("Xinhua Power") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held indirectly
Registered capital	¥ 284,880,000
Business nature and scope of operation	Power generation, power equipment repair
Percentage of equity interest held, Interest	70.00%
Percentage of equity interest held, Voting	70.00%
Huaneng Tongjiang Wind Power Generation Limited Company ("Tongjiang Wind Power") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held indirectly
Registered capital	¥ 330,000,000
Business nature and scope of operation	Wind power generation, wind power plants operation, planning and design
Percentage of equity interest held, Interest	82.85%
Percentage of equity interest held, Voting	82.85%
Huaneng Daqing Thermal Power Limited Company ("Daqing Thermal Power") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held indirectly
Registered capital	¥ 630,000,000
Business nature and scope of operation	Power generation, thermal production and supply
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Daqing Luyuan Wind Power Generation Limited Company ("Luyuan Wind Power") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held indirectly
Registered capital	¥ 451,000,000
Business nature and scope of operation	Wind power generation
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Yichun Thermal Power Limited Company ("Yichun Thermal Power") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held indirectly
Registered capital	¥ 534,000,000
Business nature and scope of operation	Power construction, production and sales, thermal production and sales
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Heilongjiang Energy Sales Limited Company ("Heilongjiang Energy Sales") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held indirectly
Registered capital	¥ 210,000,000
Business nature and scope of operation	Power supply, production of heat and hot water
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Zhaodong Huaneng Thermal Power Limited Company ("Zhaodong Thermal Power") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held indirectly
Registered capital	¥ 10,000,000
Business nature and scope of operation	Heating production and supply
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Jilin Power Generation Limited Company ("Jilin Power") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 1,917,130,000
Business nature and scope of operation	Power (thermal) projects, development of new energy projects investment, construction, production, operation and sales
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Linjiang Jubao Hydropower Limited Company ("Jubao Hydropower") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held indirectly
Registered capital	¥ 20,000,000
Business nature and scope of operation	Hydropower development and operation, construction and operation of photovoltaic power generation
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Jilin Energy Sales Limited Company ("Jilin Energy Sales") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held indirectly
Registered capital	¥ 210,000,000
Business nature and scope of operation	Thermal (cold) production and supply, power supply
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Jilin Biological Power Generation Limited Company ("Jilin Biological Power") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held indirectly
Registered capital	¥ 183,800,000
Business nature and scope of operation	Biomass power generation
Percentage of equity interest held, Interest	100.00%
Percentage of equity interest held, Voting	100.00%
Huaneng Shandong Power Generation Limited Company ("Shandong Power") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 4,241,460,000
Business nature and scope of operation	Power (thermal) project development, investment, construction and management
Percentage of equity interest held, Interest	80.00%
Percentage of equity interest held, Voting	80.00%
Huaneng Jining New Energy Limited Company ("Jining New Energy") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held indirectly	[4]
Registered capital	¥ 38,000,000	[4]
Business nature and scope of operation	Investment, construction and management of photovoltaic and wind power projects	[4]
Percentage of equity interest held, Interest	80.00%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Huaneng Zibo Boshan Photovoltaic Power Limited Company ("Zibo Photovoltaic") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held indirectly	[4]
Registered capital	¥ 22,000,000	[4]
Business nature and scope of operation	Solar power generation, sales	[4]
Percentage of equity interest held, Interest	80.00%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Huaneng Rizhao Thermal Power Limited Company ("Rizhao Thermal Power") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held indirectly	[4]
Registered capital	¥ 52,000,000	[4]
Business nature and scope of operation	Urban heat construction, maintenance and operation design and construction of heat engineering	[4]
Percentage of equity interest held, Interest	80.00%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Huaneng Laiwu New Energy Limited Company ("Laiwu New Energy") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held indirectly	[4]
Registered capital	¥ 68,000,000	[4]
Business nature and scope of operation	Photovoltaic power and wind power generation	[4]
Percentage of equity interest held, Interest	80.00%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Huaneng Shandong Sishui New Energy Limited Company ("Sishui New Energy") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held indirectly	[4]
Registered capital	¥ 36,000,000	[4]
Business nature and scope of operation	Solar energy grid connected generation	[4]
Percentage of equity interest held, Interest	80.00%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Huaneng Shandong Electric And Thermal Power Marketing Limited Company ("Shandong Power Marketing") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held indirectly	[4]
Registered capital	¥ 200,000,000	[4]
Business nature and scope of operation	Sales and service of power and heating products, investment in power industry	[4]
Percentage of equity interest held, Interest	80.00%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Huaneng Shandong Information Technology Limited Company ("Shandong Power Information Company") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held indirectly	[4]
Registered capital	¥ 80,000,000	[4]
Business nature and scope of operation	Information technology and management consulting services	[4]
Percentage of equity interest held, Interest	80.00%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Huaneng Penglai Wind Power Generation Limited Company ("Penglai Wind Power") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held indirectly	[4]
Registered capital	¥ 177,210,000	[4]
Business nature and scope of operation	Development, investment, construction and management of wind power projects	[4]
Percentage of equity interest held, Interest	80.00%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Huaneng Zhanhua New Energy Limited Company ("Zhanhua New Energy") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held indirectly	[4]
Registered capital	¥ 235,298,200	[4]
Business nature and scope of operation	Wind power, photovoltaic power generation	[4]
Percentage of equity interest held, Interest	80.00%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Huaneng Yantai Bajiao Thermal Power Limited Company ("Bajiao Thermal Power") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held indirectly	[4]
Registered capital	¥ 540,000,000	[4]
Business nature and scope of operation	Power generation projects preparation	[4]
Percentage of equity interest held, Interest	80.00%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Huaneng Weihai Port Photovoltaic Power Generation Limited Company ("Port Photovoltaic") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held indirectly	[4]
Registered capital	¥ 24,960,000	[4]
Business nature and scope of operation	Photovoltaic power generation projects development and construction, electricity sales	[4]
Percentage of equity interest held, Interest	80.00%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Huaneng Zibo Baiyanghe Power Generation Limited Company ("Baiyanghe Power") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held indirectly	[4]
Registered capital	¥ 1,098,567,344	[4]
Business nature and scope of operation	Power production, on-grid sales, thermal production and supply	[4]
Percentage of equity interest held, Interest	80.00%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Huaneng Yantai Power Generation Limited Company ("Yantai Power") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held indirectly	[4]
Registered capital	¥ 547,479,100	[4]
Business nature and scope of operation	Production and sales of electricity power and heat	[4]
Percentage of equity interest held, Interest	80.00%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Huaneng Jinan Huangtai Power Generation Limited Company ("Huangtai Power") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held indirectly	[4]
Registered capital	¥ 1,391,878,400	[4]
Business nature and scope of operation	Electricity power production, heating management	[4]
Percentage of equity interest held, Interest	72.00%	[4]
Percentage of equity interest held, Voting	90.00%	[4]
Huaneng Dezhou Thermal Power Limited Company ("Dezhou Thermal Power") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held indirectly	[4]
Registered capital	¥ 20,000,000	[4]
Business nature and scope of operation	Urban heat construction, maintenance and operation design and construction of heat engineering	[4]
Percentage of equity interest held, Interest	68.00%	[4]
Percentage of equity interest held, Voting	85.00%	[4]
Huaneng Dongying New Energy Limited Company ("Dongying New Energy") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held indirectly	[4]
Registered capital	¥ 87,906,822	[4]
Business nature and scope of operation	Wind power projects development, wind power generation and sales of electricity	[4]
Percentage of equity interest held, Interest	56.00%	[4]
Percentage of equity interest held, Voting	70.00%	[4]
Huaneng Shandong Power Generation Maintenance Technology Limited Company ("Shandong Maintenance Company") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held indirectly	[4]
Registered capital	¥ 50,000,000	[4]
Business nature and scope of operation	Power engineering design, construction and construction	[4]
Percentage of equity interest held, Interest	76.55%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Huaneng Shandong Electric Power Fuel Limited Company ("Shandong Fuel Company") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held indirectly	[4]
Registered capital	¥ 100,000,000	[4]
Business nature and scope of operation	Wholesale operation of coal	[4]
Percentage of equity interest held, Interest	76.55%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Shandong Rizhao Power Generation Limited Company ("Rizhao Power") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held indirectly	[4]
Registered capital	¥ 1,245,587,900	[4]
Business nature and scope of operation	Heat, engaged in power business	[4]
Percentage of equity interest held, Interest	88.80%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Huaneng Laiwu Power Generation Limited Company ("Laiwu Power") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held indirectly	[4]
Registered capital	¥ 1,800,000,000	[4]
Business nature and scope of operation	Power production	[4]
Percentage of equity interest held, Interest	64.00%	[4]
Percentage of equity interest held, Voting	80.00%	[4]
Huaneng Shandong Ruyi Coal Power Limited Company ("Ruyi Coal Power") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held indirectly	[4]
Registered capital	¥ 1,294,680,000	[4]
Business nature and scope of operation	Development, investment, construction, operation and management of electricity power and coal	[4]
Percentage of equity interest held, Interest	40.00%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Huaneng Jiaxiang Power Generation Limited Company ("Jiaxiang Power") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held indirectly	[4]
Registered capital	¥ 646,680,000
Business nature and scope of operation	Power generation, electrical equipment maintenance	[4]
Percentage of equity interest held, Interest	40.00%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Huaneng Qufu Co-generation Limited Company ("Qufu Co-generation") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held indirectly	[4]
Registered capital	¥ 300,932,990	[4]
Business nature and scope of operation	Sales and production of electric power, thermal power	[4]
Percentage of equity interest held, Interest	40.00%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Huaneng Jining Hi-Tech Zone Co-generation Limited Company ("Jining Co-generation") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held indirectly	[4]
Registered capital	¥ 118,699,760	[4]
Business nature and scope of operation	Heat supply and power generation	[4]
Percentage of equity interest held, Interest	40.00%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Huaneng Shandong (Hongkong) Investment Limited Company ("Hong Kong Investment") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	Hong Kong	[4]
Type of interest held	held indirectly	[4]
Registered capital | shares	10,000	[4]
Business nature and scope of operation	Investment	[4]
Percentage of equity interest held, Interest	80.00%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Shandong Silk Road International Power Limited Company ("Shandong Silk Road") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held indirectly	[4]
Registered capital	¥ 35,000,000	[4]
Business nature and scope of operation	Contracting overseas projects and domestic international bidding projects, construction and operation of power project	[4]
Percentage of equity interest held, Interest	80.00%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Shandong Changdao Wind Power Generation Limited Liability Company ("Changdao Wind Power") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held indirectly	[4]
Registered capital	¥ 33,500,000	[4]
Business nature and scope of operation	Wind power, on-grid sales	[4]
Percentage of equity interest held, Interest	48.00%	[4]
Percentage of equity interest held, Voting	60.00%	[4]
Huaneng Rongcheng New Energy Co., Ltd. ("Rongcheng New Energy") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held indirectly	[4]
Registered capital	¥ 36,540,000	[4]
Business nature and scope of operation	Wind power generation	[4]
Percentage of equity interest held, Interest	48.00%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Huaneng Jining Yunhe Power Generation Co., Ltd. ("Yunhe Power") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held indirectly	[4]
Registered capital	¥ 696,355,300	[4]
Business nature and scope of operation	Electrical (thermal) production and on-grid sales, technology consulting and services	[4]
Percentage of equity interest held, Interest	78.68%	[4]
Percentage of equity interest held, Voting	98.35%	[4]
Huaneng Linyi Power Generation Limited Company ("Linyi Power") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held indirectly	[4]
Registered capital	¥ 1,093,313,400	[4]
Business nature and scope of operation	Power generation	[4]
Percentage of equity interest held, Interest	60.00%	[4]
Percentage of equity interest held, Voting	75.00%	[4]
Liaocheng Changrun National Electric Heating Limited Company ("Liaocheng Changrun") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held indirectly	[4]
Registered capital	¥ 130,000,000	[4]
Business nature and scope of operation	Heat operation, installation and repair of water, electricity, heating	[4]
Percentage of equity interest held, Interest	60.00%	[4]
Percentage of equity interest held, Voting	75.00%	[4]
Linyi Lantian Thermal Power Limited Company ("Lantian Thermal Power") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held indirectly	[4]
Registered capital	¥ 36,000,000	[4]
Business nature and scope of operation	Heat supply, maintenance of thermal power network, power sales, installation and maintenance of distribution facilities	[4]
Percentage of equity interest held, Interest	54.40%	[4]
Percentage of equity interest held, Voting	68.00%	[4]
Yantai 500 Heating Limited Company ("Yantai 500") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held indirectly	[4]
Registered capital	¥ 20,500,000	[4]
Business nature and scope of operation	Central heat services, plumbing and pipe installation services	[4]
Percentage of equity interest held, Interest	64.00%	[4]
Percentage of equity interest held, Voting	80.00%	[4]
Huaneng Liaocheng Co-generation Limited Company ("Liaocheng Co-generation) [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC	[4]
Type of interest held	held indirectly	[4]
Registered capital	¥ 610,670,000	[4]
Business nature and scope of operation	Power, heat production and sales	[4]
Percentage of equity interest held, Interest	60.00%	[4]
Percentage of equity interest held, Voting	100.00%	[4]
Huaneng Henan Zhongyuan Gas Power Generation Co., Ltd. ("Zhongyuan Gas") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	PRC
Type of interest held	held directly
Registered capital	¥ 400,000,000
Business nature and scope of operation	Investment, construction, operation and management of power projects, thermal supply, development and utilization of clean energy resources
Percentage of equity interest held, Interest	90.00%
Percentage of equity interest held, Voting	90.00%
[1]	Pursuant to an agreement entered into between the Company and another shareholder, the Company is entrusted to vote the 25% voting rights held by the other shareholder as long as the Company remains as the largest shareholder of Beijing Co-generation. Thus, the Company has majority voting rights required by the article of association to control the operation and financial policies of Beijing Co-generation. Accordingly, the Company has control over Beijing Co-generation.
[2]	According to the voting in concert agreement entered into between the Company and one shareholder with 10% equity interests in Chaohu Power, the shareholder agreed to vote the same in respect of significant financial and operating decisions made by the Company. As a result, the Company has control over Chaohu Power.
[3]	According to the voting in concert agreement entered into between the Company and the other two shareholders in Suzhou Thermal Power, the shareholders agreed to vote the same in respect of significant financial and operating decisions made by the Company. As a result, the Company has control over Suzhou Thermal Power.
[4]	These companies are subsidiaries of Shandong Power. The Company holds 80% interest in Shandong Power. Thus, the Company indirectly holds 80% interest in these companies through their parent company. Zhanhua Photovoltaic Company is a newly established subsidiary of Shandong Power in 2017. Zhanhua New Energy, a wholly-owned subsidiary of Shandong Power, holds 58% equity interests in Zhanhua Photovoltaic Company. Thus, the Company indirectly holds 46.4% equity interests in Zhanhua Photovoltaic Company. Weishan New Energy and Helan New Energy are wholly-owned subsidiaries of Ruyi Coal Power, a 50% owned subsidiary of Shandong Power. As a result, the Company indirectly holds 40% interest in Weishan New Energy and Helan New Energy. Shandong Power directly holds 58% interest in Shandong Fuel Company and Shandong Maintenance Company; meanwhile, Shandong Power indirectly holds a total of 37.68% equity interests in Shandong Fuel Company and Shandong Maintenance Company respectively through its own subsidiaries: Baiyanghe Power, Huangtai Power, Yantai Power, Linyi Power, Liaocheng Co-generation and Yunhe Power. Thus, the Company indirectly holds 76.55% interest in Shandong Maintenance Company and Shandong Fuel Company respectively. The Company directly holds 44% equity interests in Rizhao Power and Shandong Power directly holds 56% interest in Rizhao Power; Thus, the Company holds 88.8% interest in Rizhao Power; Jiaxiang Power, Qufu Co-generation, Jining Co-generation are wholly-owned subsidiaries of Ruyi Coal Power. Thus, the Company indirectly holds 40% interest in Ruyi Coal Power, Jiaxiang Power, Qufu Co-generation and Jining Co-generation; In according to the voting in concert agreement entered into among the Shandong Power and other equity holders of Laiwu Power, Ruyi Coal Power, Rongcheng New Energy, Liaocheng Co-generation, the other equity holders agreed to vote the same in respect of significant financial and operating decisions made by the Shandong Power. As a result, the Company has control over these companies.

Investments in subsidiaries 120

Investments in subsidiaries (Subsidiaries acquired from business combinations not under common control) (Detail) - 12 months ended Dec. 31, 2017		CNY (¥)	USD ($)	SGD ($)
Huaneng Weihai Power Generation Limited Liability Company ("Weihai Power") [member]
Disclosure of subsidiaries [line items]
Country of incorporation		PRC
Type of interest held		held directly
Registered capital		¥ 1,822,176,621
Business nature and scope of operation		Power generation
Percentage of equity interest held, Interest		60.00%
Percentage of equity interest held, Voting		60.00%
Huaneng Huaiyin Power Generation Limited Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation		PRC
Type of interest held		held directly
Registered capital		¥ 265,000,000
Business nature and scope of operation		Power generation
Percentage of equity interest held, Interest		100.00%
Percentage of equity interest held, Voting		100.00%
Huade County Daditaihong Wind Power Utilization Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation		PRC
Type of interest held		held directly
Registered capital		¥ 196,400,000
Business nature and scope of operation		Wind power development and utilization
Percentage of equity interest held, Interest		100.00%
Percentage of equity interest held, Voting		100.00%
Huaneng Zhanhua Co-generation Limited Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation		PRC
Type of interest held		held directly
Registered capital		¥ 190,000,000
Business nature and scope of operation		Production and sales of electricity and thermal energy
Percentage of equity interest held, Interest		100.00%
Percentage of equity interest held, Voting		100.00%
Shandong Hualu Sea Transportation Limited Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation		PRC
Type of interest held		held directly
Registered capital		¥ 100,000,000
Business nature and scope of operation		Cargo transportation along domestic coastal areas, goods storage
Percentage of equity interest held, Interest		53.00%
Percentage of equity interest held, Voting		53.00%
Huaneng Qingdao Port Limited Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation		PRC
Type of interest held		held directly
Registered capital		¥ 219,845,000
Business nature and scope of operation		Loading and conveying warehousing, conveying, water carriage materials supply
Percentage of equity interest held, Interest		51.00%
Percentage of equity interest held, Voting		51.00%
Huaneng Yunnan Diandong Energy Limited Liability Company ("Diandong Energy") [member]
Disclosure of subsidiaries [line items]
Country of incorporation		PRC
Type of interest held		held directly
Registered capital		¥ 3,769,140,000
Business nature and scope of operation		Electricity projects investment power generation and sales, coal exploitation and investment
Percentage of equity interest held, Interest		100.00%
Percentage of equity interest held, Voting		100.00%
Yunnan Diandong Yuwang Energy Limited Company ("Diandong Yuwang") [member]
Disclosure of subsidiaries [line items]
Country of incorporation		PRC
Type of interest held		held directly
Registered capital		¥ 1,700,740,000
Business nature and scope of operation		Electricity projects investment power generation and sales, coal exploitation and investment
Percentage of equity interest held, Interest		100.00%
Percentage of equity interest held, Voting		100.00%
Huaneng Suzihe Hydropower Development Limited Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation		PRC
Type of interest held		held directly
Registered capital		¥ 50,000,000
Business nature and scope of operation		Hydropower, aquaculture, agriculture irrigation
Percentage of equity interest held, Interest		100.00%
Percentage of equity interest held, Voting		100.00%
Enshi City Mawei Valley Hydropower Development Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation		PRC
Type of interest held		held directly
Registered capital		¥ 101,080,000
Business nature and scope of operation		Hydro-resource development hydropower, aquaculture
Percentage of equity interest held, Interest		100.00%
Percentage of equity interest held, Voting		100.00%
Huaneng Luoyang Co-generation Limited Liability Company [member]
Disclosure of subsidiaries [line items]
Country of incorporation		PRC
Type of interest held		held directly
Registered capital		¥ 600,000,000
Business nature and scope of operation		Production and sales of electricity and heating
Percentage of equity interest held, Interest		80.00%
Percentage of equity interest held, Voting		80.00%
Huaneng Jinling Combined Cycle Co-generation Co., Ltd. ("Jinling CCGT") [member]
Disclosure of subsidiaries [line items]
Country of incorporation	[1]	PRC
Type of interest held	[1]	held directly
Registered capital	[1]	¥ 356,350,000
Business nature and scope of operation	[1]	Construction and management of power plants and related projects
Percentage of equity interest held, Interest	[1]	51.00%
Percentage of equity interest held, Voting	[1]	72.00%
Huaneng Zhumadian Wind Power Generation Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation		PRC
Type of interest held		held directly
Registered capital		¥ 30,000,000
Business nature and scope of operation		Wind power generation, new energy development and utilization
Percentage of equity interest held, Interest		90.00%
Percentage of equity interest held, Voting		90.00%
SinoSing Power [member]
Disclosure of subsidiaries [line items]
Country of incorporation		Singapore
Type of interest held		held directly
Registered capital | $			$ 1,476,420,585
Business nature and scope of operation		Investment holding
Percentage of equity interest held, Interest		100.00%
Percentage of equity interest held, Voting		100.00%
Tuas Power [member]
Disclosure of subsidiaries [line items]
Country of incorporation		Singapore
Type of interest held		held indirectly
Registered capital | $				$ 1,433,550,000
Business nature and scope of operation		Investment holding
Percentage of equity interest held, Interest		100.00%
Percentage of equity interest held, Voting		100.00%
Tuas Power Supply Pte. Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation		Singapore
Type of interest held		held indirectly
Registered capital | $				500
Business nature and scope of operation		Power sales
Percentage of equity interest held, Interest		100.00%
Percentage of equity interest held, Voting		100.00%
TP Asset Management Pte. Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation		Singapore
Type of interest held		held indirectly
Registered capital | $				2
Business nature and scope of operation		Render of environment engineering services
Percentage of equity interest held, Interest		100.00%
Percentage of equity interest held, Voting		100.00%
TPGS Green Energy Pte. Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation		Singapore
Type of interest held		held indirectly
Registered capital | $				1,000,000
Business nature and scope of operation		Provision of utility services
Percentage of equity interest held, Interest		75.00%
Percentage of equity interest held, Voting		75.00%
NewEarth Pte. Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation		Singapore
Type of interest held		held indirectly
Registered capital | $				10,111,841
Business nature and scope of operation		Consultancy in waste recycling
Percentage of equity interest held, Interest		100.00%
Percentage of equity interest held, Voting		100.00%
NewEarth Singapore Pte. Ltd. [member]
Disclosure of subsidiaries [line items]
Country of incorporation		Singapore
Type of interest held		held indirectly
Registered capital | $				$ 17,816,050
Business nature and scope of operation		Industrial waste management and recycling
Percentage of equity interest held, Interest		100.00%
Percentage of equity interest held, Voting		100.00%
Xuzhou Tongshan District Xiehe Wind Power Generation Limited Liability Company ("Tongshan Xiehe Wind Power Generation") [member]
Disclosure of subsidiaries [line items]
Country of incorporation		PRC
Type of interest held		held indirectly
Registered capital		¥ 3,000,000
Business nature and scope of operation		Wind power generation
Percentage of equity interest held, Interest		100.00%
Percentage of equity interest held, Voting		100.00%
Luoyang Yangguang Co-generation Limited Liability Company ("Yangguang Co-generation") [member]
Disclosure of subsidiaries [line items]
Country of incorporation		PRC
Type of interest held		held indirectly
Registered capital		¥ 250,000,000
Business nature and scope of operation		Production and supply of electricity and heat power
Percentage of equity interest held, Interest		100.00%
Percentage of equity interest held, Voting		100.00%
Shanxi Xiaoyi Economic Development Zone Huaneng Energy Service Co., Ltd. ("Shanxi Xiaoyi Energy") (Note 40) [member]
Disclosure of subsidiaries [line items]
Country of incorporation	[2]	PRC
Type of interest held	[2]	held indirectly
Registered capital	[2]	¥ 100,000,000
Business nature and scope of operation	[2]	Electricity sales, sales of raw coal and processed coal
Percentage of equity interest held, Interest	[2]	51.00%
Percentage of equity interest held, Voting	[2]	100.00%
Ruzhou Xuji Wind Power Generation Limited Co., Ltd. (Note 40) [member]
Disclosure of subsidiaries [line items]
Country of incorporation		PRC
Type of interest held		held indirectly
Registered capital		¥ 4,000,000
Business nature and scope of operation		Wind power and photovoltaic power generation
Percentage of equity interest held, Interest		95.00%
Percentage of equity interest held, Voting		100.00%
[1]	According to the voting in concert agreement entered into between the Company and one shareholder with 21% equity interests in Jinling CCGT, the shareholder agreed to vote the same in respect of significant financial and operating decisions made by the Company under the circumstances that its legitimate entitlements are guaranteed. As a result, the Company has control over Jinling CCGT.
[2]	In 2016, the Company accounted for the investment in Shanxi Xiaoyi Energy as a joint venture. On 15 February 2017, the Company entered into an agreement with other shareholder with 49% equity interests in Shanxi Xiaoyi Energy who agreed to vote the same in respect of significant financial and operating decisions made by the Company. As a result, the Company has control over Shanxi Xiaoyi Energy since February 2017.

Investments in subsidiaries (De

Investments in subsidiaries (Detail information of equity interests held) (Detail)		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Huaqing Energy [member]
Disclosure of subsidiaries [line items]
Percentage of interest held by the Company	[1]	54.00%
Huaqing Energy [member] | Liangjiang Power [member]
Disclosure of subsidiaries [line items]
Percentage of interest held by the Company		60.00%
Beijing Cogeneration [member]
Disclosure of subsidiaries [line items]
Percentage of interest held by the Company	[2]	41.00%
Percentage of voting rights acquired through supplemental agreements		25.00%
Proportion of ownership interests held by non-controlling interests		59.00%	59.00%
Chaohu Power [member]
Disclosure of subsidiaries [line items]
Percentage of interest held by the Company	[3]	60.00%
Proportion of ownership interests held by non-controlling interests		10.00%
Zhanhua Photovoltaic Company [member]
Disclosure of subsidiaries [line items]
Percentage of interest held by the Company	[4],[5]	46.40%
Zhanhua Photovoltaic Company [member] | Zhanhua New Energy [member]
Disclosure of subsidiaries [line items]
Percentage of interest held by the Company		58.00%
Ruyi Coal Power [member]
Disclosure of subsidiaries [line items]
Percentage of interest held by the Company	[4]	40.00%
Ruyi Coal Power [member] | Shandong Power [member]
Disclosure of subsidiaries [line items]
Percentage of interest held by the Company		50.00%
Shandong Fuel Company [member]
Disclosure of subsidiaries [line items]
Percentage of interest held by the Company	[4]	76.55%
Shandong Fuel Company [member] | Shandong Power [member]
Disclosure of subsidiaries [line items]
Percentage of interest directly held by the Company		58.00%
Percentage of interest indirectly held by the Company		37.68%
Shandong Maintenance Company [member]
Disclosure of subsidiaries [line items]
Percentage of interest held by the Company	[4]	76.55%
Shandong Maintenance Company [member] | Shandong Power [member]
Disclosure of subsidiaries [line items]
Percentage of interest directly held by the Company		58.00%
Percentage of interest indirectly held by the Company		37.68%
Rizhao Power [member]
Disclosure of subsidiaries [line items]
Percentage of interest held by the Company	[4]	88.80%
Percentage of interest directly held by the Company		44.00%
Rizhao Power [member] | Shandong Power [member]
Disclosure of subsidiaries [line items]
Percentage of interest directly held by the Company		56.00%
Jinling CCGT [member]
Disclosure of subsidiaries [line items]
Percentage of interest held by the Company	[6]	51.00%
Proportion of ownership interests held by non-controlling interests		21.00%
Shanxi Xiaoyi Energy [member]
Disclosure of subsidiaries [line items]
Percentage of interest held by the Company	[7]	51.00%
Proportion of ownership interests held by non-controlling interests		49.00%
[1]	The Company holds 90% interest in Liangjiang Power, and Liangjiang Power holds 60% interest in Huaqing Energy. Therefore, the company indirectly holds 54% equity interest in Huaqing Energy.
[2]	Pursuant to an agreement entered into between the Company and another shareholder, the Company is entrusted to vote the 25% voting rights held by the other shareholder as long as the Company remains as the largest shareholder of Beijing Co-generation. Thus, the Company has majority voting rights required by the article of association to control the operation and financial policies of Beijing Co-generation. Accordingly, the Company has control over Beijing Co-generation.
[3]	According to the voting in concert agreement entered into between the Company and one shareholder with 10% equity interests in Chaohu Power, the shareholder agreed to vote the same in respect of significant financial and operating decisions made by the Company. As a result, the Company has control over Chaohu Power.
[4]	These companies are subsidiaries of Shandong Power. The Company holds 80% interest in Shandong Power. Thus, the Company indirectly holds 80% interest in these companies through their parent company. Zhanhua Photovoltaic Company is a newly established subsidiary of Shandong Power in 2017. Zhanhua New Energy, a wholly-owned subsidiary of Shandong Power, holds 58% equity interests in Zhanhua Photovoltaic Company. Thus, the Company indirectly holds 46.4% equity interests in Zhanhua Photovoltaic Company. Weishan New Energy and Helan New Energy are wholly-owned subsidiaries of Ruyi Coal Power, a 50% owned subsidiary of Shandong Power. As a result, the Company indirectly holds 40% interest in Weishan New Energy and Helan New Energy. Shandong Power directly holds 58% interest in Shandong Fuel Company and Shandong Maintenance Company; meanwhile, Shandong Power indirectly holds a total of 37.68% equity interests in Shandong Fuel Company and Shandong Maintenance Company respectively through its own subsidiaries: Baiyanghe Power, Huangtai Power, Yantai Power, Linyi Power, Liaocheng Co-generation and Yunhe Power. Thus, the Company indirectly holds 76.55% interest in Shandong Maintenance Company and Shandong Fuel Company respectively. The Company directly holds 44% equity interests in Rizhao Power and Shandong Power directly holds 56% interest in Rizhao Power; Thus, the Company holds 88.8% interest in Rizhao Power; Jiaxiang Power, Qufu Co-generation, Jining Co-generation are wholly-owned subsidiaries of Ruyi Coal Power. Thus, the Company indirectly holds 40% interest in Ruyi Coal Power, Jiaxiang Power, Qufu Co-generation and Jining Co-generation; In according to the voting in concert agreement entered into among the Shandong Power and other equity holders of Laiwu Power, Ruyi Coal Power, Rongcheng New Energy, Liaocheng Co-generation, the other equity holders agreed to vote the same in respect of significant financial and operating decisions made by the Shandong Power. As a result, the Company has control over these companies.
[5]	These companies were newly established in 2017.
[6]	According to the voting in concert agreement entered into between the Company and one shareholder with 21% equity interests in Jinling CCGT, the shareholder agreed to vote the same in respect of significant financial and operating decisions made by the Company under the circumstances that its legitimate entitlements are guaranteed. As a result, the Company has control over Jinling CCGT.
[7]	In 2016, the Company accounted for the investment in Shanxi Xiaoyi Energy as a joint venture. On 15 February 2017, the Company entered into an agreement with other shareholder with 49% equity interests in Shanxi Xiaoyi Energy who agreed to vote the same in respect of significant financial and operating decisions made by the Company. As a result, the Company has control over Shanxi Xiaoyi Energy since February 2017.

Investments in subsidiaries 122

Investments in subsidiaries (Detail information of subsidiaries disposal or acquirement) (Detail) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017CNY (¥)
Disclosure of subsidiaries [line items]
Reclassification from non-controlling interest to reserve due to equity transaction	¥ 0
Difference between consideration paid and derecognised non-controlling interest recorded in reserve	866,859
Capital surplus [member]
Disclosure of subsidiaries [line items]
Reclassification from non-controlling interest to reserve due to equity transaction	28,054
Difference between consideration paid and derecognised non-controlling interest recorded in reserve	0
Suzhou Combined Cycle Co-generation [member]
Disclosure of subsidiaries [line items]
Reclassification from non-controlling interest to reserve due to equity transaction	¥ 28,000
Huaneng (Luoyuan) Port Limited Company [member]
Disclosure of subsidiaries [line items]
Percentage of equity interest acquired	49.00%
Huaneng (Luoyuan) Port Limited Company [member] | Capital surplus [member]
Disclosure of subsidiaries [line items]
Difference between consideration paid and derecognised non-controlling interest recorded in reserve	¥ 4,000

Available-for-sale financial123

Available-for-sale financial assets (Detail) - CNY (¥) shares in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Available-for-sale financial assets [line items]
Available-for-sale financial assets	¥ 1,604,993,000	¥ 3,406,032,000
Impairment provisions	0	0
Other comprehensive income reclassified to profit or loss	¥ 1,135,356,000	741,648,000	¥ 0
China Yangtze Power Co., Ltd. [member]
Available-for-sale financial assets [line items]
Shares of disposal	143,780
Cash consideration	¥ 2,191,000,000
Investment income	1,480,000,000
Other comprehensive income reclassified to profit or loss	1,135,000,000
Fair value measurement [member] | Listed security [member]
Available-for-sale financial assets [line items]
Available-for-sale financial assets	9,223,000	1,820,713,000
Fair value measurement [member] | China Yangtze Power Co., Ltd. [member]
Available-for-sale financial assets [line items]
Available-for-sale financial assets	0	1,820,255,000
Fair value measurement [member] | Others [member]
Available-for-sale financial assets [line items]
Available-for-sale financial assets	9,223,000	458,000
Cost measurement [member] | Unlisted securities [member]
Available-for-sale financial assets [line items]
Available-for-sale financial assets	1,595,770,000	1,585,319,000
Cost measurement [member] | 10% of Shanxi Xishan Jinxing Energy Co., Ltd. [member]
Available-for-sale financial assets [line items]
Available-for-sale financial assets	531,274,000	531,274,000
Cost measurement [member] | 9.09% of Ganlong Double-track Railway Co., Ltd. [member]
Available-for-sale financial assets [line items]
Available-for-sale financial assets	1,000,000,000	1,000,000,000
Cost measurement [member] | Others [member]
Available-for-sale financial assets [line items]
Available-for-sale financial assets	¥ 64,496,000	¥ 54,045,000

Land use rights (Detail)

Land use rights (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about land use rights [line items]
Beginning of the year	¥ 8,456,347	¥ 8,313,766
Movement:
Business combination (Note 40)	3,182,914	61,027
Addition	331,683	364,280
Amortization charge for the year	(368,898)	(242,400)
Impairment charge for the year (Note 7)	(108,590)	(51,981)
Disposals	(86,631)	(1,969)
Disposal of subsidiaries	(146,922)	0
Currency translation differences	4,882	13,624
End of the year	11,264,785	8,456,347
Land use rights without ownership certificate [abstract]
Aggregate net book value	1,246,000	792,000
Cost [member]
Disclosure of detailed information about land use rights [line items]
Beginning of the year	10,525,537	10,059,872
Movement:
End of the year	13,775,976	10,525,537
Accumulated amortization [member]
Disclosure of detailed information about land use rights [line items]
Beginning of the year	(1,792,367)	(1,530,972)
Movement:
End of the year	(2,128,752)	(1,792,367)
Accumulated impairment losses [member]
Disclosure of detailed information about land use rights [line items]
Beginning of the year	(276,823)	(215,134)
Movement:
End of the year	¥ (382,439)	¥ (276,823)

Power generation licenses (Deta

Power generation licenses (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Power generation licenses [abstract]
Beginning of the year	¥ 3,849,199	¥ 3,679,175
Movement:
Currency translation differences	67,047	170,024
End of the year	¥ 3,916,246	¥ 3,849,199
Period of power generation license	30 years

Power generation license (Narra

Power generation license (Narrative) (Detail) - CNY (¥)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Impairment test of power generation license [line items]
Growth rates on average	3.00%
Growth rates of cash flows beyond the terminal year	2.00%
Tuas Power [member]
Impairment test of power generation license [line items]
Discount rates	7.30%	7.54%
Power generation license [member]
Impairment test of power generation license [line items]
Impairment provided for the power generation license	¥ 0
Absolute increase in discount rate of 0.5% [member] | Tuas Power [member]
Impairment test of power generation license [line items]
Recoverable amount of the CGU	¥ (2,043,000,000)	¥ (1,899,000,000)

Mining rights (Detail)

Mining rights (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about mining rights [line items]
Beginning of the year	¥ 1,646,271	¥ 1,646,271
Movement:
Addition	0	0
Impairment charge for the year	0	0
End of the year	1,646,271	1,646,271
Cost [member]
Disclosure of detailed information about mining rights [line items]
Beginning of the year	2,406,567	2,406,567
Movement:
End of the year	2,406,567	2,406,567
Accumulated impairment losses [member]
Disclosure of detailed information about mining rights [line items]
Beginning of the year	(760,296)	(760,296)
Movement:
End of the year	¥ (760,296)	¥ (760,296)

Derivative financial instrum128

Derivative financial instruments (Details of derivative financial assets) (Detail) - CNY (¥) ¥ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Details of derivative financial instruments [line items]
Derivative financial assets	¥ 333,692	¥ 378,323
Less: non-current portion	75,328	99,721
Current portion	258,364	278,602
Hedging instruments for cash flow hedge (fuel swap contracts) [member]
Details of derivative financial instruments [line items]
Derivative financial assets	330,966	264,535
Less: non-current portion	75,328	71,341
Hedging instruments for cash flow hedge (exchange forward contracts) [member]
Details of derivative financial instruments [line items]
Derivative financial assets	0	107,907
Less: non-current portion	0	28,380
Financial instruments at fair value through profit or loss (fuel swap contracts) [member]
Details of derivative financial instruments [line items]
Derivative financial assets	¥ 2,726	¥ 5,881

Derivative financial instrum129

Derivative financial instruments (Details of derivative financial liabilities) (Detail) - CNY (¥) ¥ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Details of derivative financial instruments [line items]
Derivative financial liabilities	¥ 210,664	¥ 334,738
Less: non-current portion	148,486	201,169
Current portion	62,178	133,569
Hedging instruments for cash flow hedge (fuel swap contracts) [member]
Details of derivative financial instruments [line items]
Derivative financial liabilities	11,794	164,464
Less: non-current portion	2,026	31,673
Hedging instruments for cash flow hedge (exchange forward contracts) [member]
Details of derivative financial instruments [line items]
Derivative financial liabilities	68,102	454
Less: non-current portion	21,745	295
Hedging instruments for cash flow hedge (interest rate swap contracts) [member]
Details of derivative financial instruments [line items]
Derivative financial liabilities	130,643	169,201
Less: non-current portion	124,715	169,201
Financial instruments at fair value through profit or loss (fuel swap contracts) [member]
Details of derivative financial instruments [line items]
Derivative financial liabilities	¥ 125	¥ 619

Derivative financial instrum130

Derivative financial instruments (Narrative) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2017CNY (¥)	Dec. 31, 2016CNY (¥)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Details of derivative financial instruments [line items]
Material ineffective portion recognized in the profit or loss arising from cash flow hedges	¥ 0	¥ 0
Derivative financial liabilities	210,664,000	334,738,000
The Company [member] | Interest rate swap contract [member]
Details of derivative financial instruments [line items]
Notional amount	¥ 1,150,000,000	1,443,000,000	$ 176	$ 208
Annual fixed interest	4.40%
Original annual floating interest	6-month LIBOR+1%
TPG [member] | Interest rate swap contract [member]
Details of derivative financial instruments [line items]
Notional amount	¥ 5,220,000,000	6,522,000,000	$ 1,069	$ 1,359
Original annual floating interest	6-month SOR
Derivative financial liabilities	¥ 108,000,000	¥ 99,000,000

Derivative financial instrum131

Derivative financial instruments (Analysis of contractual cash inflows (outflows) of major derivative financial instruments) (Detail) - CNY (¥) ¥ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Details of derivative financial instruments [line items]
Derivative financial assets, Carrying amounts	¥ 333,692	¥ 378,323
Derivative financial liabilities, Carrying amounts	210,664	334,738
Fuel derivatives used for hedging [member]
Details of derivative financial instruments [line items]
Derivative financial assets, Carrying amounts	330,966	264,535
Derivative financial liabilities, Carrying amounts	11,794	164,464
Derivative financial assets (net settlement), Contractual cash flows	330,966	264,535
Derivative financial liabilities (net settlement), Contractual cash flows	(11,794)	(164,464)
Forward exchange contracts used for hedging [member]
Details of derivative financial instruments [line items]
Derivative financial assets, Carrying amounts	0	107,907
Derivative financial liabilities, Carrying amounts	68,102	454
Derivative financial assets - inflows, Contractual cash flows		2,118,946
Derivative financial assets - outflows, Contractual cash flows		(2,009,205)
Derivative financial assets (net settlement), Contractual cash flows		109,741
Derivative financial liabilities - inflows, Contractual cash flows	2,509,363	527,939
Derivative financial liabilities - outflows, Contractual cash flows	(2,568,034)	(528,454)
Derivative financial liabilities (net settlement), Contractual cash flows	(58,671)	(515)
Fuel derivatives that do not qualify as hedges [member]
Details of derivative financial instruments [line items]
Derivative financial assets, Carrying amounts	2,726	5,881
Derivative financial liabilities, Carrying amounts	125	619
Derivative financial assets (net settlement), Contractual cash flows	2,726	5,881
Derivative financial liabilities (net settlement), Contractual cash flows	(125)	(619)
Net-settled interest rate swaps used for hedging [member]
Details of derivative financial instruments [line items]
Derivative financial liabilities, Carrying amounts	130,643	169,201
Derivative financial liabilities (net settlement), Contractual cash flows	(154,367)	(228,905)
Within 1 year [member] | Fuel derivatives used for hedging [member]
Details of derivative financial instruments [line items]
Derivative financial assets (net settlement), Contractual cash flows	255,638	193,194
Derivative financial liabilities (net settlement), Contractual cash flows	(9,768)	(132,792)
Within 1 year [member] | Forward exchange contracts used for hedging [member]
Details of derivative financial instruments [line items]
Derivative financial assets - inflows, Contractual cash flows		1,488,071
Derivative financial assets - outflows, Contractual cash flows		(1,407,606)
Derivative financial assets (net settlement), Contractual cash flows		80,465
Derivative financial liabilities - inflows, Contractual cash flows	2,041,812	475,881
Derivative financial liabilities - outflows, Contractual cash flows	(2,083,441)	(476,104)
Derivative financial liabilities (net settlement), Contractual cash flows	(41,629)	(223)
Within 1 year [member] | Fuel derivatives that do not qualify as hedges [member]
Details of derivative financial instruments [line items]
Derivative financial assets (net settlement), Contractual cash flows	2,726	5,881
Derivative financial liabilities (net settlement), Contractual cash flows	(125)	(619)
Within 1 year [member] | Net-settled interest rate swaps used for hedging [member]
Details of derivative financial instruments [line items]
Derivative financial liabilities (net settlement), Contractual cash flows	(82,533)	(113,563)
Cash flows, Between 1 and 5 years [member] | Fuel derivatives used for hedging [member]
Details of derivative financial instruments [line items]
Derivative financial assets (net settlement), Contractual cash flows	75,328	71,341
Derivative financial liabilities (net settlement), Contractual cash flows	(2,026)	(31,672)
Cash flows, Between 1 and 5 years [member] | Forward exchange contracts used for hedging [member]
Details of derivative financial instruments [line items]
Derivative financial assets - inflows, Contractual cash flows		630,875
Derivative financial assets - outflows, Contractual cash flows		(601,599)
Derivative financial assets (net settlement), Contractual cash flows		29,276
Derivative financial liabilities - inflows, Contractual cash flows	467,551	52,058
Derivative financial liabilities - outflows, Contractual cash flows	(484,593)	(52,350)
Derivative financial liabilities (net settlement), Contractual cash flows	(17,042)	(292)
Cash flows, Between 1 and 5 years [member] | Fuel derivatives that do not qualify as hedges [member]
Details of derivative financial instruments [line items]
Derivative financial assets (net settlement), Contractual cash flows	0	0
Derivative financial liabilities (net settlement), Contractual cash flows	0	0
Cash flows, Between 1 and 5 years [member] | Net-settled interest rate swaps used for hedging [member]
Details of derivative financial instruments [line items]
Derivative financial liabilities (net settlement), Contractual cash flows	(71,834)	(115,342)
Cash flows, After 5 years [member] | Fuel derivatives used for hedging [member]
Details of derivative financial instruments [line items]
Derivative financial assets (net settlement), Contractual cash flows	0	0
Derivative financial liabilities (net settlement), Contractual cash flows	0	0
Cash flows, After 5 years [member] | Forward exchange contracts used for hedging [member]
Details of derivative financial instruments [line items]
Derivative financial assets - inflows, Contractual cash flows		0
Derivative financial assets - outflows, Contractual cash flows		0
Derivative financial assets (net settlement), Contractual cash flows		0
Derivative financial liabilities - inflows, Contractual cash flows	0	0
Derivative financial liabilities - outflows, Contractual cash flows	0	0
Derivative financial liabilities (net settlement), Contractual cash flows	0	0
Cash flows, After 5 years [member] | Fuel derivatives that do not qualify as hedges [member]
Details of derivative financial instruments [line items]
Derivative financial assets (net settlement), Contractual cash flows	0	0
Derivative financial liabilities (net settlement), Contractual cash flows	0	0
Cash flows, After 5 years [member] | Net-settled interest rate swaps used for hedging [member]
Details of derivative financial instruments [line items]
Derivative financial liabilities (net settlement), Contractual cash flows	¥ 0	¥ 0

Goodwill (Movements of goodwill

Goodwill (Movements of goodwill) (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of reconciliation of changes in goodwill [line items]
Beginning of the year	¥ 12,135,729	¥ 11,677,182
Movement:
Business combination (Note 40)	3,167,566	0
End of the year	15,484,120	12,135,729
Cost [member]
Disclosure of reconciliation of changes in goodwill [line items]
Beginning of the year	15,391,642	14,919,930
Movement:
Disposal of subsidiary	(309,269)	0
Currency translation differences	186,015	471,712
End of the year	18,435,954	15,391,642
Accumulated impairment losses [member]
Disclosure of reconciliation of changes in goodwill [line items]
Beginning of the year	(3,255,913)	(3,242,748)
Movement:
Disposal of subsidiary	309,269	0
Currency translation differences	(5,190)	(13,165)
End of the year	¥ (2,951,834)	¥ (3,255,913)

Goodwill (Impairment test for g

Goodwill (Impairment test for goodwill) (Carrying amounts of major goodwill allocated to individual CGUs) (Detail) - CNY (¥) ¥ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Impairment test for goodwill [line items]
Major Goodwill allocated to individual CGUs	¥ 15,484,120	¥ 12,135,729	¥ 11,677,182
Shandong Power [member]
Impairment test for goodwill [line items]
Major Goodwill allocated to individual CGUs	2,739,818	0
Wuhan Power [member]
Impairment test for goodwill [line items]
Major Goodwill allocated to individual CGUs	518,484	518,484
Hainan Power [member]
Impairment test for goodwill [line items]
Major Goodwill allocated to individual CGUs	506,336	506,336
Heilongjiang Power [member]
Impairment test for goodwill [line items]
Major Goodwill allocated to individual CGUs	265,319	0
Yangliuqing Cogeneration [member]
Impairment test for goodwill [line items]
Major Goodwill allocated to individual CGUs	151,459	151,459
Qinbei Power [member]
Impairment test for goodwill [line items]
Major Goodwill allocated to individual CGUs	109,913	109,913
Jilin Power [member]
Impairment test for goodwill [line items]
Major Goodwill allocated to individual CGUs	109,826	0
Yueyang Power Company [member]
Impairment test for goodwill [line items]
Major Goodwill allocated to individual CGUs	100,907	100,907
Beijing Cogeneration [member]
Impairment test for goodwill [line items]
Major Goodwill allocated to individual CGUs	95,088	95,088
Tuas Power [member]
Impairment test for goodwill [line items]
Major Goodwill allocated to individual CGUs	¥ 10,561,956	¥ 10,381,131

Goodwill (Impairment test fo134

Goodwill (Impairment test for goodwill) (Rates used for value-in-use calculations) (Detail)	Dec. 31, 2017
Impairment test for goodwill [line items]
Growth rates on average	3.00%
Growth rates of cash flows beyond the terminal year	2.00%
PRC power segment [member] | Bottom of range [member]
Impairment test for goodwill [line items]
Discount rates	8.51%
PRC power segment [member] | Top of range [member]
Impairment test for goodwill [line items]
Discount rates	13.59%
Singapore segment [member]
Impairment test for goodwill [line items]
Discount rates	7.30%

Other non-current assets (Detai

Other non-current assets (Details of other non-current assets) (Detail) - CNY (¥)		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Other non-current assets [abstract]
VAT recoverable		¥ 2,741,604,000	¥ 1,651,891,000
Prepayments for pre-construction cost		937,161,000	0
Intangible assets	[1]	697,884,000	411,308,000
Finance lease receivables		617,187,000	563,099,000
Prepaid territorial water use right	[2]	374,743,000	777,994,000
Prepayments for capacity quota		303,399,000	0
Profit compensation from Huaneng Group (Note 40)		244,533,000	0
Prepaid connection fees		120,486,000	108,365,000
Others		1,659,848,000	809,288,000
Total		7,696,845,000	4,321,945,000
Impairment provided for the intangible assets		¥ 0	¥ 0
Contractual period of amortization, prepaid territorial water use right		50 years
[1]	The intangible assets primarily consist of software, patented technologies and etc. In 2017, there is no impairment provided for the intangible assets (2016: RMB nil).
[2]	The prepaid territorial water use right are amortized over the contractual period of 50 years.

Inventories (Details of invento

Inventories (Details of inventories) (Detail) - CNY (¥) ¥ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Inventories [abstract]
Fuel (coal and oil) for power generation	¥ 5,684,824	¥ 5,391,068
Material and supplies	1,869,462	1,655,357
Gross amounts of inventories	7,554,286	7,046,425
Less: provision for inventory obsolescence	168,875	167,282	¥ 162,389	¥ 163,458
Total	¥ 7,385,411	¥ 6,879,143

Inventories (Movements of provi

Inventories (Movements of provision for inventory obsolescence during years) (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Inventories [abstract]
Beginning of the year	¥ (167,282)	¥ (162,389)	¥ (163,458)
Provision	(1,520)	(1,134)	(2,867)
Reversal	1,782	1,390	1,039
Disposal of subsidiaries	162	0	0
Currency translation differences	(2,017)	(5,149)	2,897
End of the year	¥ (168,875)	¥ (167,282)	¥ (162,389)

Other receivables and assets (D

Other receivables and assets (Detail) - CNY (¥) ¥ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Other receivables and assets [abstract]
Prepayments for inventories	¥ 387,335	¥ 252,389
Prepaid income tax	150,838	141,423
Prepayments for pre-construction cost	0	885,051
Prepayments for capacity quota	0	303,399
Others	181,913	121,810
Total prepayments	720,086	1,704,072
Less: provision for doubtful accounts	4,638	0
Total prepayments, net	715,448	1,704,072
Dividends receivable	273,897	861,408
Receivables from sales of fuel	290,040	0
Others	1,528,855	908,296
Subtotal other receivables	2,092,792	1,769,704
Less: provision for doubtful accounts	29,241	28,961
Total other receivables, net	2,063,551	1,740,743
Profit compensation from Huaneng Group (Note 40)	615,013	0
VAT recoverable	2,607,505	2,008,955
Designated loan to a joint venture	80,000	80,000
Gross total	6,115,396	5,562,731
Net total	¥ 6,081,517	¥ 5,533,770

Other receivables and assets (G

Other receivables and assets (Gross amount of other receivables denominated) (Detail) - CNY (¥) ¥ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Gross amounts of other receivables denominated [line items]
Gross amounts of other receivables	¥ 2,092,792	¥ 1,769,704
RMB [member]
Gross amounts of other receivables denominated [line items]
Gross amounts of other receivables	1,966,971	1,635,051
S$ [member]
Gross amounts of other receivables denominated [line items]
Gross amounts of other receivables	76,529	95,816
US$ [member]
Gross amounts of other receivables denominated [line items]
Gross amounts of other receivables	¥ 49,292	¥ 38,837

Other receivables and assets (M

Other receivables and assets (Movements of other receivables provision for doubtful accounts) (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other receivables and assets [abstract]
Beginning of the year	¥ (28,961)	¥ (27,957)	¥ (29,644)
Provision	(5,890)	(1,011)	(9)
Reversal/write-off	972	7	1,696
End of the year	¥ (33,879)	¥ (28,961)	¥ (27,957)

Other receivables and assets (A

Other receivables and assets (Ageing analysis of other receivables) (Detail) - CNY (¥) ¥ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Ageing analysis of other receivables [line items]
Other receivables	¥ 2,092,792	¥ 1,769,704
Financial assets past due but not impaired [member]
Ageing analysis of other receivables [line items]
Other receivables	140,055	113,109
Financial assets past due but not impaired [member] | Within 1 year [member]
Ageing analysis of other receivables [line items]
Other receivables	61,189	42,103
Financial assets past due but not impaired [member] | Between 1 to 2 years [member]
Ageing analysis of other receivables [line items]
Other receivables	1,360	2,683
Financial assets past due but not impaired [member] | Between 2 to 3 years [member]
Ageing analysis of other receivables [line items]
Other receivables	1,130	847
Financial assets past due but not impaired [member] | Over 3 years [member]
Ageing analysis of other receivables [line items]
Other receivables	76,376	67,476
Financial assets impaired [member]
Ageing analysis of other receivables [line items]
Other receivables	41,410	36,212
Financial assets impaired [member] | Within 1 year [member]
Ageing analysis of other receivables [line items]
Other receivables	7,535	752
Financial assets impaired [member] | Between 1 to 2 years [member]
Ageing analysis of other receivables [line items]
Other receivables	10	912
Financial assets impaired [member] | Between 2 to 3 years [member]
Ageing analysis of other receivables [line items]
Other receivables	463	285
Financial assets impaired [member] | Over 3 years [member]
Ageing analysis of other receivables [line items]
Other receivables	¥ 33,402	¥ 34,263

Accounts receivable (Detail)

Accounts receivable (Detail) - CNY (¥) ¥ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounts receivable [abstract]
Accounts receivable	¥ 21,948,753	¥ 14,050,096
Notes receivable	3,610,928	2,432,264
Gross amounts of account receivables	25,559,681	16,482,360
Less: provision for doubtful accounts	112,086	88,889	¥ 2,054	¥ 11,809
Total	¥ 25,447,595	¥ 16,393,471

Accounts receivable (Denominati

Accounts receivable (Denominations of gross amounts of account receivable) (Detail) - CNY (¥) ¥ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Gross amounts of account receivables denominated [line items]
Gross amounts of account receivables	¥ 25,559,681	¥ 16,482,360
RMB [member]
Gross amounts of account receivables denominated [line items]
Gross amounts of account receivables	24,633,465	15,586,989
S$ [member]
Gross amounts of account receivables denominated [line items]
Gross amounts of account receivables	922,993	876,956
US$ [member]
Gross amounts of account receivables denominated [line items]
Gross amounts of account receivables	¥ 3,223	¥ 18,415

Accounts receivable (Movements

Accounts receivable (Movements of provision for doubtful accounts) (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounts receivable [abstract]
Beginning of the year	¥ (88,889)	¥ (2,054)	¥ (11,809)
Provision	(23,363)	(88,818)	(60)
Reversal	0	397	1,833
Write-off	167	1,682	0
Transfer from a subsidiary to a joint venture	0	0	8,126
Currency translation differences	(1)	(96)	(144)
End of the year	¥ (112,086)	¥ (88,889)	¥ (2,054)

Accounts receivable (Ageing ana

Accounts receivable (Ageing analysis of accounts receivable) (Detail) - CNY (¥) ¥ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Ageing analysis of accounts receivable and notes receivable [line items]
Accounts receivable	¥ 25,559,681	¥ 16,482,360
Within 1 year [member]
Ageing analysis of accounts receivable and notes receivable [line items]
Accounts receivable	24,787,284	16,152,038
Between 1 to 2 years [member]
Ageing analysis of accounts receivable and notes receivable [line items]
Accounts receivable	576,564	279,694
Between 2 to 3 years [member]
Ageing analysis of accounts receivable and notes receivable [line items]
Accounts receivable	155,360	29,123
Over 3 years [member]
Ageing analysis of accounts receivable and notes receivable [line items]
Accounts receivable	¥ 40,473	¥ 21,505

Accounts receivable (Ageing 146

Accounts receivable (Ageing analysis of accounts receivable and notes receivable neither individually nor collectively impaired) (Detail) - CNY (¥) ¥ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Ageing analysis of accounts receivable and notes receivable [line items]
Accounts receivable	¥ 25,559,681	¥ 16,482,360
Financial assets not impaired [member]
Ageing analysis of accounts receivable and notes receivable [line items]
Accounts receivable	25,447,595	16,393,471
Financial assets neither past due nor impaired [member]
Ageing analysis of accounts receivable and notes receivable [line items]
Accounts receivable	24,936,171	16,063,215
Financial assets past due but not impaired [member] | Within 1 year [member]
Ageing analysis of accounts receivable and notes receivable [line items]
Accounts receivable	267,845	248,597
Financial assets past due but not impaired [member] | Between 1 to 2 years [member]
Ageing analysis of accounts receivable and notes receivable [line items]
Accounts receivable	206,188	63,094
Financial assets past due but not impaired [member] | Between 2 to 3 years [member]
Ageing analysis of accounts receivable and notes receivable [line items]
Accounts receivable	27,130	17,944
Financial assets past due but not impaired [member] | Over 3 years [member]
Ageing analysis of accounts receivable and notes receivable [line items]
Accounts receivable	¥ 10,261	¥ 621

Accounts receivable (Narrative)

Accounts receivable (Narrative) (Detail) - CNY (¥)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about accounts receivable [line items]
Accounts receivable secured to banks as collateral against loans	¥ 0	¥ 0
The maturity period of the notes receivable	from 1 to 12 months	from 1 to 12 months
The Company and its subsidiaries except for SinoSing Power [member]
Disclosure of detailed information about accounts receivable [line items]
Credit period	one month from the end of the month in which the sales are made
SinoSing Power [member]
Disclosure of detailed information about accounts receivable [line items]
Credit period	from 5 to 60 days from the dates of billings

Share capital (Detail)

Share capital (Detail) - CNY (¥) ¥ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
As at 1 January and 31 December
Number of shares	15,200,383,440	15,200,383,440	15,200,383,440	14,420,383,000
Share capital	¥ 15,200,383	¥ 15,200,383	¥ 15,200,383
A shares [member]
As at 1 January and 31 December
Number of shares	10,500,000,000	10,500,000,000	10,500,000,000
Share capital	¥ 10,500,000	¥ 10,500,000	¥ 10,500,000
Overseas listed foreign shares [member]
As at 1 January and 31 December
Number of shares	4,700,383,440	4,700,383,440	4,700,383,440
Share capital	¥ 4,700,383	¥ 4,700,383	¥ 4,700,383

Perpetual Corporate Bonds (Deta

Perpetual Corporate Bonds (Detail) - CNY (¥) ¥ / shares in Units, ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of information about perpetual corporate bonds [line items]
Aggregate net proceeds from issuing perpetual corporate bonds	¥ 4,999,950	¥ 0	¥ 0
Application distribution rate	sum of the applicable benchmark interest rate, the initial spread and 300 basis points per annum
Profit	¥ 1,584,207	¥ 10,347,987	¥ 17,259,107
Perpetual corporate bonds [member]
Disclosure of information about perpetual corporate bonds [line items]
Number	50,000,000	0
Par value	¥ 5,000,000
Profit	¥ 69,000
Bond A [member]
Disclosure of information about perpetual corporate bonds [line items]
Issuance Date	September 2,017
Category	Equity Instrument
Initial annual distribution rate	5.05%
Issue Price	¥ 100
Number	25,000,000	0
Par value	¥ 2,500,000
Initial Period	3 Years
Conversion Condition	None
Conversion Result	None
Bond B [member]
Disclosure of information about perpetual corporate bonds [line items]
Issuance Date	September 2,017
Category	Equity Instrument
Initial annual distribution rate	5.17%
Issue Price	¥ 100
Number	25,000,000	0
Par value	¥ 2,500,000
Initial Period	5 years
Conversion Condition	None
Conversion Result	None

Perpetual Corporate Bonds (Chan

Perpetual Corporate Bonds (Changes of perpetual corporate bonds) (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of information about perpetual corporate bonds [line items]
Amount, at the beginning of period	¥ 0
Amount, Issuance	4,999,950
Cumulative interests	68,600	¥ 0	¥ 0
Amount, at the end of period	¥ 5,068,550	¥ 0
Perpetual corporate bonds [member]
Disclosure of information about perpetual corporate bonds [line items]
Number, at the beginning of period	0
Amount, at the beginning of period	¥ 0
Number, Issuance	50,000,000
Amount, Issuance	¥ 4,999,950
Cumulative interests	¥ 68,600
Number, at the end of period	50,000,000	0
Amount, at the end of period	¥ 5,068,550	¥ 0
Perpetual corporate bond A [member]
Disclosure of information about perpetual corporate bonds [line items]
Number, at the beginning of period	0
Amount, at the beginning of period	¥ 0
Number, Issuance	25,000,000
Amount, Issuance	¥ 2,499,975
Cumulative interests	¥ 33,897
Number, at the end of period	25,000,000	0
Amount, at the end of period	¥ 2,533,872	¥ 0
Perpetual corporate bond B [member]
Disclosure of information about perpetual corporate bonds [line items]
Number, at the beginning of period	0
Amount, at the beginning of period	¥ 0
Number, Issuance	25,000,000
Amount, Issuance	¥ 2,499,975
Cumulative interests	¥ 34,703
Number, at the end of period	25,000,000	0
Amount, at the end of period	¥ 2,534,678	¥ 0

Surplus reserves (Detail)

Surplus reserves (Detail) - CNY (¥)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Surplus reserves [abstract]
Surplus reserves	¥ 8,140,030,000	¥ 8,140,030,000
Provision made for statutory surplus reserve	0
Provision made to discretionary surplus reserve	¥ 0	¥ 0

Surplus reserves (Disclosure of

Surplus reserves (Disclosure of retained earnings) (Detail) - CNY (¥) ¥ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Disclosure of information of retained earnings [line items]
Retained earnings	¥ 35,793,257	¥ 38,690,132
PRC GAAP [member]
Disclosure of information of retained earnings [line items]
Retained earnings	¥ 31,965,000

Dividends (Detail)

Dividends (Detail) - CNY (¥) ¥ / shares in Units, ¥ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Dividends [abstract]
Cash dividend per share	¥ 0.1	¥ 0.29	¥ 0.47
Total cash dividend	¥ 1,520	¥ 4,408	¥ 7,144

Long-term loans (Detail)

Long-term loans (Detail) - CNY (¥) ¥ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Disclosure of long-term loans [line items]
Long-term loans	¥ 125,129,416	¥ 74,551,246
Less: Current portion	18,098,458	9,560,885
Non-current portion	107,030,958	64,990,361
Huaneng Group and its subsidiaries (a) [member]
Disclosure of long-term loans [line items]
Long-term loans	7,427,183	3,818,807
Less: Current portion	2,123,494	855,222
Non-current portion	5,303,689	2,963,585
Bank loans and other loans (b) [member]
Disclosure of long-term loans [line items]
Long-term loans	117,702,233	70,732,439
Less: Current portion	15,974,964	8,705,663
Non-current portion	¥ 101,727,269	¥ 62,026,776

Long-term loans (Loans from Hua

Long-term loans (Loans from Huaneng Group and its subsidiaries) (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of long-term loans [line items]
Long-term loans	¥ 125,129,416	¥ 74,551,246
Less: Current portion	18,098,458	9,560,885
Non-current portion	107,030,958	64,990,361
Huaneng Group and its subsidiaries [member]
Disclosure of long-term loans [line items]
Long-term loans	7,427,183	3,818,807
Less: Current portion	2,123,494	855,222
Non-current portion	5,303,689	2,963,585
Huaneng Group [member] | Unsecured [member] | RMB [member] | Variable rate [member]
Disclosure of long-term loans [line items]
Long-term loans	665,225	665,015
Less: Current portion	0	640,485
Non-current portion	¥ 665,225	¥ 24,530
Annual interest rate	4.75%	4.75%
HIPDC [member] | Unsecured [member] | RMB [member] | Variable rate [member]
Disclosure of long-term loans [line items]
Long-term loans		¥ 210
Less: Current portion		0
Non-current portion		¥ 210
Annual interest rate		4.75%
Huaneng Finance [member] | Unsecured [member] | RMB [member] | Variable rate [member]
Disclosure of long-term loans [line items]
Long-term loans	¥ 2,794,780	¥ 286,000
Less: Current portion	244,500	60,000
Non-current portion	¥ 2,550,280	¥ 226,000
Annual interest rate	4.28%-4.66%	4.41%-4.75%
Huaneng Tiancheng Financial Leasing Co., Ltd. ("Tiancheng Financial Leasing") [member] | Secured [member] | RMB [member] | Variable rate [member]
Disclosure of long-term loans [line items]
Long-term loans	¥ 3,967,178	¥ 2,867,582
Less: Current portion	1,878,994	154,737
Non-current portion	¥ 2,088,184	¥ 2,712,845
Annual interest rate	4.06%-4.51%	4.42%

Long-term loans (Bank loans and

Long-term loans (Bank loans and other loans) (Detail) € in Thousands, ¥ in Thousands, ¥ in Thousands, $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017CNY (¥)	Dec. 31, 2016CNY (¥)	Dec. 31, 2017USD ($)	Dec. 31, 2017SGD ($)	Dec. 31, 2017EUR (€)	Dec. 31, 2017JPY (¥)	Dec. 31, 2016USD ($)	Dec. 31, 2016SGD ($)	Dec. 31, 2016EUR (€)	Dec. 31, 2016JPY (¥)
Disclosure of long-term loans [line items]
Long-term loans	¥ 125,129,416	¥ 74,551,246
Less: Current portion	18,098,458	9,560,885
Non-current portion	107,030,958	64,990,361
Bank loans and other loans [member]
Disclosure of long-term loans [line items]
Long-term loans	117,702,233	70,732,439
Less: Current portion	15,974,964	8,705,663
Non-current portion	101,727,269	62,026,776
Bank loans and other loans [member] | Secured [member] | RMB [member] | Fixed rate [member]
Disclosure of long-term loans [line items]
Long-term loans	7,080,379	8,305,310
Less: Current portion	1,213,150	1,202,430
Non-current portion	¥ 5,867,229	¥ 7,102,880
Annual interest rate	4.41%-4.90%	4.41%-4.90%
Bank loans and other loans [member] | Secured [member] | RMB [member] | Variable rate [member]
Disclosure of long-term loans [line items]
Long-term loans	¥ 4,117,055	¥ 760,500
Less: Current portion	657,231	56,800
Non-current portion	¥ 3,459,824	¥ 703,700
Annual interest rate	4.66%-4.90%	4.66%-4.90%
Bank loans and other loans [member] | Unsecured [member] | RMB [member] | Fixed rate [member]
Disclosure of long-term loans [line items]
Long-term loans	¥ 14,981,859	¥ 15,896,017
Less: Current portion	3,179,426	2,515,343
Non-current portion	¥ 11,802,433	¥ 13,380,674
Annual interest rate	2.00%-5.00%	2.65%-5.00%
Bank loans and other loans [member] | Unsecured [member] | RMB [member] | Variable rate [member]
Disclosure of long-term loans [line items]
Long-term loans	¥ 76,467,082	¥ 30,095,494
Less: Current portion	10,013,829	4,270,910
Non-current portion	¥ 66,453,253	¥ 25,824,584
Annual interest rate	1.80%-6.03%	4.17%-5.65%
Bank loans and other loans [member] | Unsecured [member] | US$ [member] | Variable rate [member]
Disclosure of long-term loans [line items]
Long-term loans	¥ 2,271,785	¥ 2,842,505	$ 347,676				$ 409,760
Less: Current portion	418,163	388,925
Non-current portion	¥ 1,853,622	¥ 2,453,580
Annual interest rate	1.74%/2.26%	1.92%
Bank loans and other loans [member] | Unsecured [member] | S$ [member] | Variable rate [member]
Disclosure of long-term loans [line items]
Long-term loans	¥ 12,396,329	¥ 12,385,213		$ 2,538,619				$ 2,580,522
Less: Current portion	419,570	196,410
Non-current portion	¥ 11,976,759	¥ 12,188,803
Annual interest rate	2.73%/4.25%	2.76%/4.25%
Bank loans and other loans [member] | Unsecured [member] | EUR [member] | Fixed rate [member]
Disclosure of long-term loans [line items]
Long-term loans	¥ 237,680	¥ 286,329			€ 30,463				€ 39,187
Less: Current portion	67,207	68,271
Non-current portion	¥ 170,473	¥ 218,058
Annual interest rate	1.30%-2.15%	2.00%/2.15%
Bank loans and other loans [member] | Unsecured [member] | JPY [member] | Fixed rate [member]
Disclosure of long-term loans [line items]
Long-term loans	¥ 150,064	¥ 161,071				¥ 2,592,661				¥ 2,702,533
Less: Current portion	6,388	6,574
Non-current portion	¥ 143,676	¥ 154,497
Annual interest rate	0.75%	0.75%

Long-term loans (Narrative) (De

Long-term loans (Narrative) (Detail) - CNY (¥)	Dec. 31, 2017	Dec. 31, 2016
Disclosure of long-term loans [line items]
Long-term loans	¥ 125,129,416,000	¥ 74,551,246,000
Secured [member] | Property, plant and equipment [member]
Disclosure of long-term loans [line items]
Long-term loans	4,605,000,000	2,902,000,000
Net book value of property, plant and equipment	5,167,000,000	3,105,000,000
Secured [member] | Future electricity and heat revenue [member]
Disclosure of long-term loans [line items]
Long-term loans	10,559,000,000	9,032,000,000
Tiancheng Financial Leasing [member] | Secured [member] | Property, plant and equipment [member]
Disclosure of long-term loans [line items]
Long-term loans	3,697,000,000	2,868,000,000
Nominal price of buy back when lease term expires	1
Net book value of property, plant and equipment	4,064,000,000	2,999,000,000
Other financial leasing companies [member] | Secured [member] | Property, plant and equipment [member]
Disclosure of long-term loans [line items]
Long-term loans	638,000,000	0
Nominal price of buy back when lease term expires	1
Net book value of property, plant and equipment	¥ 1,103,000,000	¥ 0

Long-term loans (Maturity of lo

Long-term loans (Maturity of long-term loans) (Detail) - CNY (¥) ¥ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Disclosure of long-term loans [line items]
Long-term loans	¥ 125,129,416	¥ 74,551,246
Less: amount due within 1 year included under current liabilities	18,098,458	9,560,885
Non-current portion	107,030,958	64,990,361
Huaneng Group and its subsidiaries [member]
Disclosure of long-term loans [line items]
Long-term loans	7,427,183	3,818,807
Less: amount due within 1 year included under current liabilities	2,123,494	855,222
Non-current portion	5,303,689	2,963,585
Bank loans and other loans [member]
Disclosure of long-term loans [line items]
Long-term loans	117,702,233	70,732,439
Less: amount due within 1 year included under current liabilities	15,974,964	8,705,663
Non-current portion	101,727,269	62,026,776
1 year or less [member] | Huaneng Group and its subsidiaries [member]
Disclosure of long-term loans [line items]
Long-term loans	2,123,494	855,222
1 year or less [member] | Bank loans and other loans [member]
Disclosure of long-term loans [line items]
Long-term loans	15,974,964	8,705,663
More than 1 year but no more than 2 years [member] | Huaneng Group and its subsidiaries [member]
Disclosure of long-term loans [line items]
Long-term loans	1,689,582	715,400
More than 1 year but no more than 2 years [member] | Bank loans and other loans [member]
Disclosure of long-term loans [line items]
Long-term loans	19,039,483	11,420,746
More than 2 years but no more than 3 years [member] | Huaneng Group and its subsidiaries [member]
Disclosure of long-term loans [line items]
Long-term loans	1,281,082	953,082
More than 2 years but no more than 3 years [member] | Bank loans and other loans [member]
Disclosure of long-term loans [line items]
Long-term loans	18,624,576	11,081,242
More than 3 years but no more than 4 years [member] | Huaneng Group and its subsidiaries [member]
Disclosure of long-term loans [line items]
Long-term loans	294,020	928,082
More than 3 years but no more than 4 years [member] | Bank loans and other loans [member]
Disclosure of long-term loans [line items]
Long-term loans	16,388,976	7,769,955
More than 4 years but no more than 5 years [member] | Huaneng Group and its subsidiaries [member]
Disclosure of long-term loans [line items]
Long-term loans	728,225	232,021
More than 4 years but no more than 5 years [member] | Bank loans and other loans [member]
Disclosure of long-term loans [line items]
Long-term loans	11,927,930	7,618,953
More than 5 years [member] | Huaneng Group and its subsidiaries [member]
Disclosure of long-term loans [line items]
Long-term loans	1,310,780	135,000
More than 5 years [member] | Bank loans and other loans [member]
Disclosure of long-term loans [line items]
Long-term loans	¥ 35,746,304	¥ 24,135,880

Long-term loans (Interest payme

Long-term loans (Interest payment schedule of long-term loans in future years) (Detail) - CNY (¥) ¥ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Disclosure of long-term loans [line items]
The interest payment of long-term loans in the future years	¥ 22,064,960	¥ 13,610,208
1 year or less [member]
Disclosure of long-term loans [line items]
The interest payment of long-term loans in the future years	5,071,743	2,987,045
More than 1 year but no more than 2 years [member]
Disclosure of long-term loans [line items]
The interest payment of long-term loans in the future years	4,225,736	2,577,363
More than 2 year but no more than 5 years [member]
Disclosure of long-term loans [line items]
The interest payment of long-term loans in the future years	7,903,397	4,912,222
More than 5 years [member]
Disclosure of long-term loans [line items]
The interest payment of long-term loans in the future years	¥ 4,864,084	¥ 3,133,578

Long-term bonds (Detail)

Long-term bonds (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of long-term bonds [line items]
Total actual proceeds received	¥ 7,800,000	¥ 4,200,000	¥ 0
Bonds issued in December 2007 [member]
Disclosure of long-term bonds [line items]
Total actual proceeds received	¥ 5,885,000
Bonds with maturity of 5 years issued in December 2007 [member]
Disclosure of long-term bonds [line items]
Maturity	5 years
Face value	¥ 1,000,000
Annual interest rate	5.67%
Annual effective interest rates	6.13%
Interest paid per annum	¥ 57,000
Bonds with maturity of 7 years issued in December 2007 [member]
Disclosure of long-term bonds [line items]
Maturity	7 years
Face value	¥ 1,700,000
Annual interest rate	5.75%
Annual effective interest rates	6.10%
Interest paid per annum	¥ 98,000
Bonds with maturity of 10 years issued in December 2007 [member]
Disclosure of long-term bonds [line items]
Maturity	10 years
Face value	¥ 3,300,000
Annual interest rate	5.90%
Annual effective interest rates	6.17%
Interest paid per annum	¥ 195,000
Bonds with maturity of 10 years issued in May 2008 [member]
Disclosure of long-term bonds [line items]
Maturity	10 years
Face value	¥ 4,000,000
Annual interest rate	5.20%
Total actual proceeds received	¥ 3,933,000
Annual effective interest rates	5.42%
Interest paid per annum	¥ 208,000
Interest payable	¥ 135,060	135,060
Medium-term notes with maturity of 5 years issued in July 2014 [member]
Disclosure of long-term bonds [line items]
Maturity	5 years
Face value	¥ 4,000,000
Annual interest rate	5.30%
Total actual proceeds received	¥ 3,988,000
Annual effective interest rates	5.37%
Interest paid per annum	¥ 212,000
Interest payable	99,320	99,320
Corporate bonds issued in June 2016 [member]
Disclosure of long-term bonds [line items]
Total actual proceeds received	¥ 4,200,000
Corporate bonds with maturity of 5 years issued in June 2016 [member]
Disclosure of long-term bonds [line items]
Maturity	5 years
Face value	¥ 3,000,000
Annual interest rate	3.48%
Annual effective interest rates	3.48%
Interest paid per annum	¥ 104,400
Interest payable	¥ 57,780	57,780
Corporate bonds with maturity of 10 years issued in June 2016 [member]
Disclosure of long-term bonds [line items]
Maturity	10 years
Face value	¥ 1,200,000
Annual interest rate	3.98%
Annual effective interest rates	3.98%
Interest paid per annum	¥ 47,760
Interest payable	¥ 26,430	¥ 26,430
Medium-term notes with maturity of 5 years issued in July 2017 [member]
Disclosure of long-term bonds [line items]
Maturity	5 years
Face value	¥ 5,000,000
Annual interest rate	4.69%
Total actual proceeds received	¥ 5,000,000
Annual effective interest rates	4.69%
Interest paid per annum	¥ 234,500
Interest payable	¥ 111,150
Debt financing instrument with maturity of 3 years issued in July 2017 [member]
Disclosure of long-term bonds [line items]
Maturity	3 years
Face value	¥ 500,000
Annual interest rate	4.75%
Total actual proceeds received	¥ 499,000
Annual effective interest rates	4.82%
Interest paid per annum	¥ 23,750
Interest payable	¥ 11,020
Corporate bonds with maturity of 3 years issued in November 2017 [member]
Disclosure of long-term bonds [line items]
Maturity	3 years
Face value	¥ 2,300,000
Annual interest rate	4.99%
Total actual proceeds received	¥ 2,299,000
Annual effective interest rates	4.99%
Interest paid per annum	¥ 114,770
Interest payable	¥ 17,610

Other non-current liabilitie161

Other non-current liabilities (Detail) - CNY (¥) ¥ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Other non-current liabilities [abstract]
Finance lease payables (a)	¥ 1,600,106	¥ 1,088,846
Government grants - Environmental subsidies (b)	1,245,810	1,122,406
Government grants - Other government grants	179,226	174,216
Other deferred income	1,825,614	379,615
Others	969,052	870,597
Subtotal	5,819,808	3,635,680
Current portion of finance lease payables	(470,985)	(568,645)
Current portion of other non-current liabilities	(64,361)	(247,537)
Subtotal	(535,346)	(816,182)
Total	¥ 5,284,462	¥ 2,819,498

Other non-current liabilitie162

Other non-current liabilities (Obligation under finance leases) (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of other non-current liabilities [line items]
Non-current finance lease liabilities	¥ 1,769,161	¥ 1,136,413
Less: total future interest expense	169,055	47,567
Total	1,600,106	1,088,846
Asset-related government grants credited to the statement of comprehensive income	140,130	102,210
Within 1 year [member]
Disclosure of other non-current liabilities [line items]
Non-current finance lease liabilities	500,790	605,806
More than 1 year but no more than 2 years [member]
Disclosure of other non-current liabilities [line items]
Non-current finance lease liabilities	312,125	266,792
More than 2 years but no more than 3 years [member]
Disclosure of other non-current liabilities [line items]
Non-current finance lease liabilities	281,990	82,470
After 3 years [member]
Disclosure of other non-current liabilities [line items]
Non-current finance lease liabilities	¥ 674,256	¥ 181,345

Accounts payable and other l163

Accounts payable and other liabilities (Detail) - CNY (¥)	Dec. 31, 2017	Dec. 31, 2016
Accounts payable and other liabilities [abstract]
Accounts and notes payable	¥ 15,496,475,000	¥ 12,059,004,000
Payables to contractors for construction	14,491,632,000	10,832,444,000
Retention payables to contractors	2,008,106,000	1,445,383,000
Amounts received in advance	1,504,926,000	365,887,000
Accrued interests	947,302,000	676,462,000
Others	4,451,691,000	3,367,437,000
Total	38,900,132,000	28,746,617,000
Notes payable secured by notes receivable	¥ 0	¥ 0

Accounts payable and other l164

Accounts payable and other liabilities (Carrying amounts of financial liabilities) (Detail) - CNY (¥) ¥ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Carrying amounts of financial liabilities [line items]
Carrying amounts of financial liabilities (excluding amounts received in advance) included in accounts payable and other liabilities	¥ 37,395,206	¥ 28,380,730
RMB [member]
Carrying amounts of financial liabilities [line items]
Carrying amounts of financial liabilities (excluding amounts received in advance) included in accounts payable and other liabilities	36,399,243	27,222,632
S$ [member]
Carrying amounts of financial liabilities [line items]
Carrying amounts of financial liabilities (excluding amounts received in advance) included in accounts payable and other liabilities	556,881	669,797
US$ [member]
Carrying amounts of financial liabilities [line items]
Carrying amounts of financial liabilities (excluding amounts received in advance) included in accounts payable and other liabilities	436,358	479,179
JPY [member]
Carrying amounts of financial liabilities [line items]
Carrying amounts of financial liabilities (excluding amounts received in advance) included in accounts payable and other liabilities	2,469	6,917
EUR [member]
Carrying amounts of financial liabilities [line items]
Carrying amounts of financial liabilities (excluding amounts received in advance) included in accounts payable and other liabilities	¥ 255	¥ 2,205

Accounts payable and other l165

Accounts payable and other liabilities (Ageing analysis of accounts and notes payable) (Detail) - CNY (¥) ¥ in Thousands	Dec. 31, 2017	Dec. 31, 2016
The ageing analysis of accounts and notes payable [line items]
Accounts and notes payable	¥ 15,496,475	¥ 12,059,004
Within 1 year [member]
The ageing analysis of accounts and notes payable [line items]
Accounts and notes payable	15,201,380	11,902,522
Between 1 to 2 years [member]
The ageing analysis of accounts and notes payable [line items]
Accounts and notes payable	196,082	100,092
Over 2 years [member]
The ageing analysis of accounts and notes payable [line items]
Accounts and notes payable	¥ 99,013	¥ 56,390

Taxes payable (Detail)

Taxes payable (Detail) - CNY (¥) ¥ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Taxes payable [abstract]
VAT payable	¥ 619,329	¥ 439,304
Income tax payable	430,703	440,791
Others	252,178	209,010
Total	¥ 1,302,210	¥ 1,089,105

Short-term bonds (Detail)

Short-term bonds (Detail) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017CNY (¥)
Unsecured super short-term bond with maturity of 365 days issued in August 2016 [member]
Disclosure of short-term bonds [line items]
Face value	¥ 3,000,000
Annual interest rate	2.50%
Maturity	365 days
Annual effective interest rates	2.91%
Unsecured super short-term bond with maturity of 365 days issued in October 2016 [member]
Disclosure of short-term bonds [line items]
Face value	¥ 3,000,000
Annual interest rate	2.60%
Maturity	365 days
Annual effective interest rates	3.01%
Unsecured super short-term bond one with maturity of 270 days issued in April 2016 [member]
Disclosure of short-term bonds [line items]
Face value	¥ 4,000,000
Annual interest rate	2.42%
Maturity	270 days
Annual effective interest rates	2.73%
Unsecured super short-term bond two with maturity of 270 days issued in April 2016 [member]
Disclosure of short-term bonds [line items]
Face value	¥ 3,000,000
Annual interest rate	2.62%
Maturity	270 days
Annual effective interest rates	2.93%
Unsecured super short-term bond with maturity of 270 days issued in May 2016 [member]
Disclosure of short-term bonds [line items]
Face value	¥ 3,000,000
Annual interest rate	2.73%
Maturity	270 days
Annual effective interest rates	3.04%
Unsecured super short-term bond with maturity of 270 days issued in July 2016 [member]
Disclosure of short-term bonds [line items]
Face value	¥ 4,000,000
Annual interest rate	2.50%
Maturity	270 days
Annual effective interest rates	2.81%
Unsecured super short-term bond with maturity of 270 days issued in November 2016 [member]
Disclosure of short-term bonds [line items]
Face value	¥ 2,000,000
Annual interest rate	2.79%
Maturity	270 days
Annual effective interest rates	3.10%
Unsecured super short-term bond with maturity of 180 days issued in November 2016 [member]
Disclosure of short-term bonds [line items]
Face value	¥ 3,000,000
Annual interest rate	2.98%
Maturity	180 days
Annual effective interest rates	3.19%
Unsecured super short-term bond with maturity of 270 days issued in December 2016 [member]
Disclosure of short-term bonds [line items]
Face value	¥ 2,000,000
Annual interest rate	3.45%
Maturity	270 days
Annual effective interest rates	3.78%
Unsecured super short-term bond with maturity of 270 days issued in January 2017 [member]
Disclosure of short-term bonds [line items]
Face value	¥ 4,000,000
Annual interest rate	3.40%
Maturity	270 days
Annual effective interest rates	3.85%
Unsecured super short-term bond with maturity of 270 days issued in February 2017 [member]
Disclosure of short-term bonds [line items]
Face value	¥ 3,000,000
Annual interest rate	3.67%
Maturity	270 days
Annual effective interest rates	3.76%
Unsecured super short-term bond with maturity of 180 days issued in March 2017 [member]
Disclosure of short-term bonds [line items]
Face value	¥ 3,000,000
Annual interest rate	3.60%
Maturity	180 days
Annual effective interest rates	3.76%
Unsecured super short-term bond with maturity of 90 days issued in April 2017 [member]
Disclosure of short-term bonds [line items]
Face value	¥ 4,000,000
Annual interest rate	3.60%
Maturity	90 days
Annual effective interest rates	3.68%
Unsecured super short-term bond with maturity of 150 days issued in June 2017 [member]
Disclosure of short-term bonds [line items]
Face value	¥ 2,000,000
Annual interest rate	4.19%
Maturity	150 days
Annual effective interest rates	4.24%
Unsecured super short-term bond with maturity of 60 days issued in August 2017 [member]
Disclosure of short-term bonds [line items]
Face value	¥ 4,000,000
Annual interest rate	3.96%
Maturity	60 days
Annual effective interest rates	4.00%
Unsecured super short-term bond with maturity of 180 days issued in October 2017 [member]
Disclosure of short-term bonds [line items]
Face value	¥ 4,000,000
Annual interest rate	4.10%
Maturity	180 days
Annual effective interest rates	4.22%
Interest payables	¥ 33,700
Unsecured super short-term bond one with maturity of 180 days issued in November 2017 [member]
Disclosure of short-term bonds [line items]
Face value	¥ 2,000,000
Annual interest rate	4.19%
Maturity	180 days
Annual effective interest rates	4.35%
Interest payables	¥ 10,800
Unsecured super short-term bond two with maturity of 180 days issued in November 2017 [member]
Disclosure of short-term bonds [line items]
Face value	¥ 1,000,000
Annual interest rate	4.17%
Maturity	180 days
Annual effective interest rates	4.19%
Interest payables	¥ 4,570
Unsecured super short-term bond with maturity of 90 days issued in December 2017 [member]
Disclosure of short-term bonds [line items]
Face value	¥ 4,000,000
Annual interest rate	4.17%
Maturity	90 days
Annual effective interest rates	4.35%
Interest payables	¥ 14,170

Short-term loans (Detail)

Short-term loans (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of short-term loans [line items]
Short-term loans	¥ 80,251,348	¥ 57,668,874
Secured [member] | RMB [member] | Fixed rate [member]
Disclosure of short-term loans [line items]
Short-term loans	¥ 24,000	¥ 13,500
Annual interest rate	4.71%-5.50%	3.00%
Secured [member] | RMB [member] | Variable rate [member]
Disclosure of short-term loans [line items]
Short-term loans	¥ 0	¥ 112,034
Annual interest rate		2.77%-3.80%
Unsecured [member] | RMB [member] | Fixed rate [member]
Disclosure of short-term loans [line items]
Short-term loans	¥ 10,450,248	¥ 3,319,947
Annual interest rate	3.92%-4.35%	3.70%-4.35%
Unsecured [member] | RMB [member] | Variable rate [member]
Disclosure of short-term loans [line items]
Short-term loans	¥ 69,777,100	¥ 54,223,393
Annual interest rate	3.74%-4.35%	3.57%-4.35%

Short-term loans (Narrative) (D

Short-term loans (Narrative) (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Conditions of short-term loans [line items]
Short-term loans represented the notes receivable that were discounted with resource	¥ 24,000	¥ 126,000
Short-term loans	80,251,348	57,668,874
Xi'an Thermal Power Research Institute Co., Ltd. ("Xi'an Thermal") [member]
Conditions of short-term loans [line items]
Short-term loans	¥ 100,000	¥ 100,000
Annual interest rate	4.13%	3.92%
Huaneng Finance [member]
Conditions of short-term loans [line items]
Short-term loans	¥ 6,505,000	¥ 3,355,000
Annual interest rate	from 3.92% to 4.35%	from 3.92% to 4.13%
A subsidiary of Huaneng Energy & Communications Holdings Co., Ltd. [member]
Conditions of short-term loans [line items]
Short-term loans	¥ 753,000	¥ 0
Annual interest rate	from 3.92% to 4.13%

Deferred income tax assets a170

Deferred income tax assets and liabilities (Detail) - CNY (¥) ¥ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Deferred income tax assets and liabilities [abstract]
Deferred income tax assets before offsetting	¥ 3,604,577	¥ 2,432,552	¥ 2,389,857
Offset amount	(1,304,486)	(1,168,595)
Deferred income tax assets after offsetting	2,300,091	1,263,957
Deferred income tax liabilities before offsetting	(5,871,166)	(3,431,347)	(3,819,609)
Offset amount	1,304,486	1,168,595
Deferred income tax liabilities after offsetting	(4,566,680)	(2,262,752)
Net deferred income tax assets and liabilities	¥ (2,266,589)	¥ (998,795)	¥ (1,429,752)	¥ (926,481)

Deferred income tax assets a171

Deferred income tax assets and liabilities (Gross movement on deferred income tax accounts) (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Deferred income tax assets and liabilities [abstract]
Beginning of the year	¥ (998,795)	¥ (1,429,752)	¥ (926,481)
Business combination (Note 40)	(2,322,513)	(58,929)	(1,007,147)
Disposal of subsidiaries (Note 6)	17,407	0	0
Credited to profit or loss (Note 33)	724,712	440,817	687,206
Charged to other comprehensive income	330,834	87,775	(198,525)
Currency translation differences	(18,234)	(38,706)	15,195
End of the year	¥ (2,266,589)	¥ (998,795)	¥ (1,429,752)

Deferred income tax assets a172

Deferred income tax assets and liabilities (Movements in deferred income tax assets without taking into consideration offsetting) (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of deferred income tax assets and liabilities [line items]
Beginning of the year	¥ 2,432,552	¥ 2,389,857
Business combination	1,133,930	73,400
Disposal of subsidiaries (Note 6)	(78,484)
Credited to profit or loss	124,987	141,686
(Charged) /credited to other comprehensive income	(11,905)	(182,400)
Currency translation differences	3,497	10,009
End of the year	3,604,577	2,432,552
Hedging reserve [member]
Disclosure of deferred income tax assets and liabilities [line items]
Beginning of the year	17,476	199,876
Business combination	0	0
Disposal of subsidiaries (Note 6)	0
Credited to profit or loss	0	0
(Charged) /credited to other comprehensive income	(11,905)	(182,400)
Currency translation differences	0	0
End of the year	5,571	17,476
Amortization of land use rights [member]
Disclosure of deferred income tax assets and liabilities [line items]
Beginning of the year	13,915	14,417
Business combination	0	0
Disposal of subsidiaries (Note 6)	0
Credited to profit or loss	(493)	(502)
(Charged) /credited to other comprehensive income	0	0
Currency translation differences	0	0
End of the year	13,422	13,915
Provision for impairment loss [member]
Disclosure of deferred income tax assets and liabilities [line items]
Beginning of the year	607,154	399,418
Business combination	0	66,560
Disposal of subsidiaries (Note 6)	(10,686)
Credited to profit or loss	(2,593)	140,969
(Charged) /credited to other comprehensive income	0	0
Currency translation differences	82	207
End of the year	593,957	607,154
Depreciation [member]
Disclosure of deferred income tax assets and liabilities [line items]
Beginning of the year	538,204	572,379
Business combination	574,600	6,840
Disposal of subsidiaries (Note 6)	(9,962)
Credited to profit or loss	(70,209)	(41,015)
(Charged) /credited to other comprehensive income	0	0
Currency translation differences	0	0
End of the year	1,032,633	538,204
Accrued expenses [member]
Disclosure of deferred income tax assets and liabilities [line items]
Beginning of the year	42,123	40,938
Business combination	5,052	0
Disposal of subsidiaries (Note 6)	0
Credited to profit or loss	7,076	1,185
(Charged) /credited to other comprehensive income	0	0
Currency translation differences	0	0
End of the year	54,251	42,123
VAT refunds on purchases of domestically manufactured equipment [member]
Disclosure of deferred income tax assets and liabilities [line items]
Beginning of the year	205,009	230,442
Business combination	0	0
Disposal of subsidiaries (Note 6)	0
Credited to profit or loss	(25,433)	(25,433)
(Charged) /credited to other comprehensive income	0	0
Currency translation differences	0	0
End of the year	179,576	205,009
Unused tax losses [member]
Disclosure of deferred income tax assets and liabilities [line items]
Beginning of the year	230,988	235,984
Business combination	139,387	0
Disposal of subsidiaries (Note 6)	(5,566)
Credited to profit or loss	196,613	(5,128)
(Charged) /credited to other comprehensive income	0	0
Currency translation differences	0	132
End of the year	561,422	230,988
Others [member]
Disclosure of deferred income tax assets and liabilities [line items]
Beginning of the year	777,683	696,403
Business combination	414,891	0
Disposal of subsidiaries (Note 6)	(52,270)
Credited to profit or loss	20,026	71,610
(Charged) /credited to other comprehensive income	0	0
Currency translation differences	3,415	9,670
End of the year	¥ 1,163,745	¥ 777,683

Deferred income tax assets a173

Deferred income tax assets and liabilities (Movements in deferred income tax liabilities without taking into consideration offsetting) (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of deferred income tax assets and liabilities [line items]
Beginning of the year	¥ (3,431,347)	¥ (3,819,609)
Business combination (Note 40)	(3,456,443)	(132,329)
Disposal of subsidiaries (Note 6)	95,891
Credited to profit or loss	599,725	299,131
(Charged) /credited to other comprehensive loss	342,739	270,175
Currency translation differences	(21,731)	(48,715)
End of the year	(5,871,166)	(3,431,347)
Hedging reserve [member]
Disclosure of deferred income tax assets and liabilities [line items]
Beginning of the year	(18,399)	0
Business combination (Note 40)	0	0
Disposal of subsidiaries (Note 6)	0
Credited to profit or loss	0	0
(Charged) /credited to other comprehensive loss	(5,558)	(26,530)
Currency translation differences	(304)	8,131
End of the year	(24,261)	(18,399)
Fair value gains [member]
Disclosure of deferred income tax assets and liabilities [line items]
Beginning of the year	(348,537)	(645,242)
Business combination (Note 40)	(1,736)	0
Disposal of subsidiaries (Note 6)	0
Credited to profit or loss	0	0
(Charged) /credited to other comprehensive loss	348,297	296,705
Currency translation differences	0	0
End of the year	(1,976)	(348,537)
Amortization of land use rights [member]
Disclosure of deferred income tax assets and liabilities [line items]
Beginning of the year	(891,155)	(904,173)
Business combination (Note 40)	(148,129)	(10,423)
Disposal of subsidiaries (Note 6)	1,761
Credited to profit or loss	27,457	24,948
(Charged) /credited to other comprehensive loss	0	0
Currency translation differences	(540)	(1,507)
End of the year	(1,010,606)	(891,155)
Depreciation [member]
Disclosure of deferred income tax assets and liabilities [line items]
Beginning of the year	(1,149,054)	(1,291,706)
Business combination (Note 40)	(3,209,672)	0
Disposal of subsidiaries (Note 6)	22,162
Credited to profit or loss	525,780	169,088
(Charged) /credited to other comprehensive loss	0	0
Currency translation differences	(9,490)	(26,436)
End of the year	(3,820,274)	(1,149,054)
Power generation license [member]
Disclosure of deferred income tax assets and liabilities [line items]
Beginning of the year	(654,363)	(625,460)
Business combination (Note 40)	0	0
Disposal of subsidiaries (Note 6)	0
Credited to profit or loss	0	0
(Charged) /credited to other comprehensive loss	0	0
Currency translation differences	(11,397)	(28,903)
End of the year	(665,760)	(654,363)
Mining rights [member]
Disclosure of deferred income tax assets and liabilities [line items]
Beginning of the year	(129,383)	(157,215)
Business combination (Note 40)	0	0
Disposal of subsidiaries (Note 6)	0
Credited to profit or loss	0	27,832
(Charged) /credited to other comprehensive loss	0	0
Currency translation differences	0	0
End of the year	(129,383)	(129,383)
Territorial water use right [member]
Disclosure of deferred income tax assets and liabilities [line items]
Beginning of the year	(72,432)	(74,201)
Business combination (Note 40)	0	0
Disposal of subsidiaries (Note 6)	68,696
Credited to profit or loss	1,327	1,769
(Charged) /credited to other comprehensive loss	0	0
Currency translation differences	0	0
End of the year	(2,409)	(72,432)
Others [member]
Disclosure of deferred income tax assets and liabilities [line items]
Beginning of the year	(168,024)	(121,612)
Business combination (Note 40)	(96,906)	(121,906)
Disposal of subsidiaries (Note 6)	3,272
Credited to profit or loss	45,161	75,494
(Charged) /credited to other comprehensive loss	0	0
Currency translation differences	0	0
End of the year	¥ (216,497)	¥ (168,024)

Deferred income tax assets a174

Deferred income tax assets and liabilities (Narrative) (Detail) - CNY (¥)	Dec. 31, 2017	Dec. 31, 2016
Disclosure of deferred income tax assets and liabilities [line items]
Deferred tax liabilities	¥ 4,566,680,000	¥ 2,262,752,000
Temporary differences relating to interest in equity method investees [member]
Disclosure of deferred income tax assets and liabilities [line items]
Taxable temporary differences	2,950,000,000	3,390,000,000
Deferred tax liabilities	0	0
Temporary differences relating to the undistributed profit of a wholly-owned foreign subsidiary [member]
Disclosure of deferred income tax assets and liabilities [line items]
Taxable temporary differences	3,060,000,000	3,540,000,000
Deferred tax liabilities	¥ 0	¥ 0

Deferred income tax assets a175

Deferred income tax assets and liabilities (Unrecognized deferred income tax assets in respect of certain deductible temporary differences and accumulated tax losses) (Detail) - CNY (¥) ¥ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred income tax assets and liabilities [abstract]
Deductible temporary differences	¥ 4,672,788	¥ 2,957,316
Unused tax losses	8,665,079	6,669,820
Total	¥ 13,337,867	¥ 9,627,136

Deferred income tax assets a176

Deferred income tax assets and liabilities (Summarized information of expiry dates of tax losses) (Detail) - CNY (¥) ¥ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Disclosure of deferred income tax assets and liabilities [line items]
The tax losses	¥ 8,665,079	¥ 6,669,820
Not later than one year [member]
Disclosure of deferred income tax assets and liabilities [line items]
The tax losses	1,557,045	1,841,365
Later than one year and not later than two years [member]
Disclosure of deferred income tax assets and liabilities [line items]
The tax losses	1,579,066	1,122,070
Later than two years and not later than three years [member]
Disclosure of deferred income tax assets and liabilities [line items]
The tax losses	1,524,531	1,195,811
Later than three years and not later than four years [member]
Disclosure of deferred income tax assets and liabilities [line items]
The tax losses	1,558,573	1,061,468
Later than four years and not later than five years [member]
Disclosure of deferred income tax assets and liabilities [line items]
The tax losses	¥ 2,445,864	¥ 1,449,106

Additional financial informa177

Additional financial information to consolidated statements of financial position (Detail) - CNY (¥) ¥ in Millions	Dec. 31, 2017	Dec. 31, 2016
Additional financial information to consolidated statements of financial position [abstract]
Net current liabilities	¥ 107,413	¥ 93,230
Total assets less current liabilities	¥ 240,639	¥ 184,643

Income tax expense (Detail)

Income tax expense (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Income tax expense [abstract]
Current income tax expense	¥ 1,942,238	¥ 3,905,968		¥ 6,386,149
Deferred income tax (Note 31)	(724,712)	(440,817)		(687,206)
Total	¥ 1,217,526	¥ 3,465,151	[1]	¥ 5,698,943	[1]
[1]	Restated. The Company completed the acquisition of equity interests of four companies from Huaneng Group, see Note 40 for details. As the acquisition is a business combination under common control, the transaction is accounted for under merger accounting method under PRC GAAP. The assets and liabilities acquired in business combinations are measured at the carrying amounts of the acquirees in the consolidated financial statements of the ultimate controlling party on the acquisition date. The operating results for all periods presented are retrospectively restated as if the current structure and operations resulting from the acquisition had been in existence from the date when the acquirees first became under the control of the same ultimate controlling party. Therefore the relevant comparative figures in the segment information were restated under PRC GAAP while the acquisition is accounted for using acquisition method under IFRS.

Income tax expense (Reconciliat

Income tax expense (Reconciliation of effective income tax rate from notional income tax rate) (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income tax expense [abstract]
Notional tax on profit before income tax expense, calculated at the applicable income tax rates in the countries concerned	26.13%	25.16%	25.11%
Effect of tax losses not recognized	18.45%	1.58%	(0.12%)
Effect of deductible temporary differences not recognized	6.04%	(0.20%)	(0.16%)
Effect of non-taxable income	(12.37%)	(2.89%)	(1.77%)
Effect of non-deductible expenses	7.05%	1.09%	1.37%
Others	(1.84%)	0.35%	0.39%
Effective tax rate	43.46%	25.09%	24.82%

Income tax expense (Narrative)

Income tax expense (Narrative) (Detail) - CNY (¥)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Detail of income tax expense [line items]
Profits tax	¥ 1,217,526,000	¥ 3,465,151,000	[1]	¥ 5,698,943,000	[1]
Applicable income tax rate	26.13%	25.16%		25.11%
Hong Kong [member]
Detail of income tax expense [line items]
Profits tax	¥ 0	¥ 0
Estimated assessable profits	¥ 0	¥ 0
PRC [member]
Detail of income tax expense [line items]
Applicable income tax rate	25.00%	25.00%
Singapore [member]
Detail of income tax expense [line items]
Applicable income tax rate	17.00%	17.00%
[1]	Restated. The Company completed the acquisition of equity interests of four companies from Huaneng Group, see Note 40 for details. As the acquisition is a business combination under common control, the transaction is accounted for under merger accounting method under PRC GAAP. The assets and liabilities acquired in business combinations are measured at the carrying amounts of the acquirees in the consolidated financial statements of the ultimate controlling party on the acquisition date. The operating results for all periods presented are retrospectively restated as if the current structure and operations resulting from the acquisition had been in existence from the date when the acquirees first became under the control of the same ultimate controlling party. Therefore the relevant comparative figures in the segment information were restated under PRC GAAP while the acquisition is accounted for using acquisition method under IFRS.

Earnings per share (Detail)

Earnings per share (Detail) - CNY (¥) ¥ / shares in Units, ¥ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings per share [abstract]
Profit/ (loss) from continuing operations attributable to shareholders		¥ 1,579,836	¥ 8,520,427	¥ 13,651,933
Less: cumulative distribution of perpetual corporate bonds		68,600	0	0
Consolidated net profit attributable to ordinary Shareholders of the Company		¥ 1,511,236	¥ 8,520,427	¥ 13,651,933
Weighted average number of the Company's outstanding ordinary shares ('000)	[1]	15,200,383,000	15,200,383,000	14,485,383,000
Basic and diluted earnings per share (RMB)		¥ 0.10	¥ 0.56	¥ 0.94
Weighted average number of ordinary shares [abstract]
Issued ordinary shares at the beginning of the year		15,200,383,440	15,200,383,440	14,420,383,000
Effect of share issue		0	0	65,000,000
Weighted average number of ordinary shares at the end of the year	[1]	15,200,383,000	15,200,383,000	14,485,383,000
Dilutive effect on earnings per share		¥ 0	¥ 0
Dilutive potential ordinary		0	0
[1]	Weighted average number of ordinary shares: 2017 2016 2015 '000 '000 '000 Issued ordinary shares at 1 January 15,200,383 |15,200,383 |14,420,383 Effect of share issue - | - | 65,000 Weighted average number of ordinary shares at 31 December 15,200,383 |15,200,383 |14,485,383

Notes to consolidated statem182

Notes to consolidated statement of cash flows (Detail) - CNY (¥) ¥ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Consolidated Statements of Cash Flows [abstract]
Total bank balances and cash	¥ 9,364,823	¥ 7,881,630	¥ 7,537,813
Less: Restricted cash	82,433	71,129	59,563
Cash and cash equivalents as at year end	¥ 9,282,390	¥ 7,810,501	¥ 7,478,250	¥ 12,238,367

Notes to consolidated statem183

Notes to consolidated statement of cash flows (Currencies of bank balances and cash denominated) (Detail) - CNY (¥)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Currencies of bank balances and cash denominated [line items]
Bank balances and cash	¥ 9,364,823,000	¥ 7,881,630,000	¥ 7,537,813,000
Material non-cash investing and financing transactions	0	0
RMB [member]
Currencies of bank balances and cash denominated [line items]
Bank balances and cash	8,213,100,000	6,691,911,000	5,847,363,000
S$ [member]
Currencies of bank balances and cash denominated [line items]
Bank balances and cash	835,995,000	869,591,000	1,130,356,000
US$ [member]
Currencies of bank balances and cash denominated [line items]
Bank balances and cash	315,535,000	319,944,000	559,761,000
JPY [member]
Currencies of bank balances and cash denominated [line items]
Bank balances and cash	193,000	184,000	205,000
HK$ [member]
Currencies of bank balances and cash denominated [line items]
Bank balances and cash	¥ 0	¥ 0	¥ 128,000

Notes to consolidated statem184

Notes to consolidated statement of cash flows (Changes in group's liabilities from financing activities) (Detail) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017CNY (¥)
Loans (Note24, 30) [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
The group's liabilities from financing activities at the beginning of the year	¥ 132,220,120
(a) Business combination	47,562,251
(b) Changes from financing cash flows:
Proceeds from new bank loans	140,270,455
Repayment of bank loans	(113,769,036)
Proceeds from new bonds	0
Repayment of bonds	0
Capital element of finance lease rentals paid	0
Interest element of finance lease rentals paid	0
Interest paid	0
Others	(3,135)
(c) Exchange adjustments	82,298
(d) Changes in fair value	0
(e) Other changes:
New finance leases	0
Interest expenses	0
Capitalised borrowing costs	0
Disposal of subsidiaries	(1,166,899)
Others	184,710
The group's liabilities from financing activities at the end of the year	205,380,764
Bonds (Note25, 29) [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
The group's liabilities from financing activities at the beginning of the year	42,788,810
(a) Business combination	0
(b) Changes from financing cash flows:
Proceeds from new bank loans	0
Repayment of bank loans	0
Proceeds from new bonds	38,788,679
Repayment of bonds	(50,300,000)
Capital element of finance lease rentals paid	0
Interest element of finance lease rentals paid	0
Interest paid	(885,000)
Others	(80,643)
(c) Exchange adjustments	0
(d) Changes in fair value	0
(e) Other changes:
New finance leases	0
Interest expenses	747,377
Capitalised borrowing costs	0
Disposal of subsidiaries	0
Others	0
The group's liabilities from financing activities at the end of the year	31,059,223
Accrued interests (Note 27) [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
The group's liabilities from financing activities at the beginning of the year	676,462
(a) Business combination	85,380
(b) Changes from financing cash flows:
Proceeds from new bank loans	0
Repayment of bank loans	0
Proceeds from new bonds	0
Repayment of bonds	0
Capital element of finance lease rentals paid	0
Interest element of finance lease rentals paid	0
Interest paid	(9,195,102)
Others	0
(c) Exchange adjustments	2,095
(d) Changes in fair value	0
(e) Other changes:
New finance leases	0
Interest expenses	8,902,402
Capitalised borrowing costs	476,065
Disposal of subsidiaries	0
Others	0
The group's liabilities from financing activities at the end of the year	947,302
Finance leases payables (Note 26) [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
The group's liabilities from financing activities at the beginning of the year	1,088,846
(a) Business combination	521,083
(b) Changes from financing cash flows:
Proceeds from new bank loans	0
Repayment of bank loans	0
Proceeds from new bonds	0
Repayment of bonds	0
Capital element of finance lease rentals paid	(636,145)
Interest element of finance lease rentals paid	(58,874)
Interest paid	0
Others	0
(c) Exchange adjustments	235
(d) Changes in fair value	0
(e) Other changes:
New finance leases	659,895
Interest expenses	99,225
Capitalised borrowing costs	0
Disposal of subsidiaries	0
Others	(74,159)
The group's liabilities from financing activities at the end of the year	1,600,106
Interest rate swaps contracts (liabilities) (Note 14) [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
The group's liabilities from financing activities at the beginning of the year	169,201
(a) Business combination	0
(b) Changes from financing cash flows:
Proceeds from new bank loans	0
Repayment of bank loans	0
Proceeds from new bonds	0
Repayment of bonds	0
Capital element of finance lease rentals paid	0
Interest element of finance lease rentals paid	0
Interest paid	0
Others	0
(c) Exchange adjustments	0
(d) Changes in fair value	(38,558)
(e) Other changes:
New finance leases	0
Interest expenses	0
Capitalised borrowing costs	0
Disposal of subsidiaries	0
Others	0
The group's liabilities from financing activities at the end of the year	¥ 130,643

Related party balances and t185

Related party balances and transactions (Basic information of related parties) (Detail)	12 Months Ended
	Dec. 31, 2017
Huaneng Group [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	Ultimate parent company
HIPDC [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	Parent company
Huaneng Energy & Communications Holdings Co., Ltd. and its subsidiaries [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	Subsidiaries of Huaneng Group	[1]
Huaneng Property Co., Ltd. and its subsidiaries [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	Subsidiaries of Huaneng Group
Xi'an Thermal and its subsidiaries [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	Subsidiaries of Huaneng Group
Huaneng Group Technology Innovation Center [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	A subsidiary of Huaneng Group
Huaneng Hulunbuir Energy Development Company Ltd. and its subsidiaries [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	Subsidiaries of Huaneng Group
Alltrust Insurance Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	A subsidiary of Huaneng Group
North United Power Co., Ltd. and its subsidiaries [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	Subsidiaries of Huaneng Group
Huaneng Group Clean Energy Technology Research Institute Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	A subsidiary of Huaneng Group
Huaneng Renewables Corporation Limited and its subsidiaries [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	Subsidiaries of Huaneng Group
Huaneng Carbon Assets Management Company Limited [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	A subsidiary of Huaneng Group
Huaneng Group Hong Kong Limited Company [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	A subsidiary of Huaneng Group
Huaneng Lancangjiang Hydropower Co., Inc. and its subsidiaries [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	Subsidiaries of Huaneng Group
Changping Huaneng Training Center [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	A subsidiary of Huaneng Group
Huaneng Hainan Industry Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	A subsidiary of Huaneng Group
Huaneng Baishan Coal Gangue Power Generation Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	A subsidiary of Huaneng Group
Great Wall Securities Co., Ltd. ("Great Wall Securities") [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	A subsidiary of Huaneng Group
Huaneng Nuclear Power Development Company Ltd. [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	A subsidiary of Huaneng Group
Huaneng Tibet Yarlung Zangbo River Hydropower Development & Investment Company Ltd. and its subsidiaries [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	Subsidiaries of Huaneng Group
Huaneng Xining Power Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	A subsidiary of Huaneng Group
Huaneng Coal Business Sector Co., Ltd. and its subsidiaries [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	Subsidiaries of Huaneng Group
Huaneng Integrated Industries Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	A subsidiary of Huaneng Group
Huaneng Ningxia Energy Company Ltd. [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	A subsidiary of Huaneng Group
Huaneng Shaanxi Power Generation Limited and its subsidiaries [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	Subsidiaries of Huaneng Group
Huaneng Xinjiang Energy Development Company Ltd. and its subsidiaries [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	Subsidiaries of Huaneng Group
Huaneng Gansu Energy Development Company Ltd. and its subsidiaries [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	Subsidiaries of Huaneng Group
Huaneng Capital Services Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	A subsidiary of Huaneng Group
Huaneng Shaanxi Qinling Power Generation Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	A subsidiary of Huaneng Group
Ningxia Daba Power Generation Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	A subsidiary of Huaneng Group
Huaneng Shandong Shidao Bay Nuclear Power Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	A subsidiary of Huaneng Group
Huangtai #8 Power Plant [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	An investee with significant influence
Shanghai Time Shipping [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	A joint venture of the Company
Jiangsu Nantong Power [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	A joint venture of the Company
Huaneng Yingkou Port Limited Liability Company [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	A joint venture of the Company
Luyi Power [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	A joint venture of the Company
Ruyi (Hong Kong) Energy and its subsidiaries [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	Joint ventures of the Company
Suzhou Sugao Renewables Service Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	A joint venture of the Company
Liaocheng Luxi Fuel Co., Ltd. Company [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	An associate of the Company
Zhengzhou Airport Xinggang Power Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	An associate of the Company
Chongqing Huaneng Lime Company Limited [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	An associate of the Company
Hainan Nuclear [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	An associate of the Company
Sichuan Hydropower [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	An associate of the Company and also a subsidiary of Huaneng Group
Hanfeng Power [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	An associate of the Company and also a subsidiary of Huaneng Group
Tiancheng Financial Leasing [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	An associate of the Company and also a subsidiary of Huaneng Group
Huaneng Shidao Bay Nuclear Power Development Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	An associate of the Company and also a subsidiary of Huaneng Group
Xiapu Nuclear Power Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	An associate of the Company and also a subsidiary of Huaneng Group
Huaneng Finance [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	An associate of the Company and also a subsidiary of Huaneng Group
Huaneng (Tianjing) Coal Gasification Power Generation Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	An associate of the Company and also a subsidiary of Huaneng Group
Huaneng Group Fuel Company and its subsidiaries [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	Associates of the Company and also subsidiaries of Huaneng Group
Other government-related enterprises [member]
Disclosure of transactions between related parties [line items]
Nature of relationship	Related parties of the Company	[2]
[1]	Transactions with subsidiaries of Huaneng Group which also are associates of the Company and its subsidiaries are presented as transactions with subsidiaries of Huaneng Group for note 36(a) and 36(b).
[2]	Huaneng Group is a state-owned enterprise. In accordance with the revised IAS 24, "Related Party Disclosures", government-related enterprises, other than entities under Huaneng Group, which the PRC government has control, joint control or significant influence over are also considered as related parties of the Company and its subsidiaries ("other government-related enterprises").

Related party balances and t186

Related party balances and transactions (Related party balances) (Cash deposits in related parties) (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of transactions between related parties [line items]
Savings deposit	¥ 7,506,706	¥ 5,155,002
Bottom of range [member]
Disclosure of transactions between related parties [line items]
Annual interest rate	0.35%	0.35%
Top of range [member]
Disclosure of transactions between related parties [line items]
Annual interest rate	1.35%	1.35%
Huaneng Finance [member]
Disclosure of transactions between related parties [line items]
Savings deposit	¥ 7,506,706	¥ 5,155,000
Great Wall Securities [member]
Disclosure of transactions between related parties [line items]
Savings deposit	¥ 0	¥ 2

Related party balances and t187

Related party balances and transactions (Related party balances) (Balances due from related parties) (Detail) - CNY (¥)	Dec. 31, 2017	Dec. 31, 2016
Disclosure of transactions between related parties [line items]
Provision made on receivable balances from related parties	¥ 0	¥ 0
Due from related party	2,410,857,000	1,126,044,000
Huaneng Group [member]
Disclosure of transactions between related parties [line items]
Due from related party	860,941,000	708,000
HIPDC [member]
Disclosure of transactions between related parties [line items]
Due from related party	99,000	0
Joint ventures of the Company [member]
Disclosure of transactions between related parties [line items]
Due from related party	360,442,000	806,112,000
Associates [member]
Disclosure of transactions between related parties [line items]
Due from related party	89,083,000	0
Subsidiaries of Huaneng Group [member]
Disclosure of transactions between related parties [line items]
Due from related party	196,621,000	319,224,000
Huangtai #8 Power Plant [member]
Disclosure of transactions between related parties [line items]
Due from related party	¥ 903,671,000	¥ 0

Related party balances and t188

Related party balances and transactions (Related party balances) (Balances due to related parties) (Detail) - CNY (¥) ¥ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Disclosure of transactions between related parties [line items]
Due to related party	¥ 4,858,053	¥ 4,760,754
Huaneng Group [member]
Disclosure of transactions between related parties [line items]
Due to related party	260,306	12,232
HIPDC [member]
Disclosure of transactions between related parties [line items]
Due to related party	16,138	14,183
Joint ventures of the Company [member]
Disclosure of transactions between related parties [line items]
Due to related party	336,170	325,590
Associates [member]
Disclosure of transactions between related parties [line items]
Due to related party	5,751	263,154
Subsidiaries of Huaneng Group [member]
Disclosure of transactions between related parties [line items]
Due to related party	¥ 4,239,688	¥ 4,145,595

Related party balances and t189

Related party balances and transactions (Related party balances) (Narrative) (Detail) - CNY (¥) ¥ in Millions	Dec. 31, 2017	Dec. 31, 2016
Other government-related enterprises [member]
Disclosure of transactions between related parties [line items]
Long-term loans (including current portion) and short-term loans	¥ 203,000	¥ 130,000
Subsidiaries of Huaneng Group [member]
Disclosure of transactions between related parties [line items]
Prepayment for construction materials	¥ 21	¥ 67

Related party balances and t190

Related party balances and transactions (Related party transactions) (Procurement of goods and receiving services) (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Huaneng Group [member]
Disclosure of transactions between related parties [line items]
Technical services and engineering contracting services	¥ 0	¥ 0	¥ 50
Other purchases	446	451	0
Subsidiaries of Huaneng Group [member]
Disclosure of transactions between related parties [line items]
Purchase of coal and transportation services	19,945,752	17,212,984	16,575,700
Technical services and engineering contracting services	1,024,369	1,055,251	769,176
Purchase of equipment	347,163	483,058	302,387
Purchase of power generation quota	0	195,528	287,779
Other purchases	716	6,472	7,073
Joint ventures of the Company [member]
Disclosure of transactions between related parties [line items]
Purchase of coal and transportation services	2,054,209	2,150,844	1,816,954
Entrusting other parties for power generation	28,953	0	0
An associate of the Company [member]
Disclosure of transactions between related parties [line items]
Other purchases	¥ 27,732	¥ 43,808	¥ 44,591

Related party balances and t191

Related party balances and transactions (Related party transactions) (Sales of goods and providing services) (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Huaneng Group [member]
Disclosure of transactions between related parties [line items]
Service provided	¥ 907	¥ 0	¥ 0
HIPDC [member]
Disclosure of transactions between related parties [line items]
Service provided	520	0	0
Subsidiaries of Huaneng Group [member]
Disclosure of transactions between related parties [line items]
Sales of power generation quota	0	1,165	135,085
Sales of goods	1,114,347	0	0
Other sales	15,247	189,914	40,780
Service provided	25,229	31,135	50,627
Provision of entrusted power generation	58,639	0	0
Joint ventures of the Company [member]
Disclosure of transactions between related parties [line items]
Other sales	407,697	9,490	23,003
Service provided	319,844	59,049	133,332
Other related party [member]
Disclosure of transactions between related parties [line items]
Provision of entrusted power generation	¥ 0	¥ 0	¥ 33,129

Related party balances and t192

Related party balances and transactions (Related party transactions) (Other related party transactions) (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
HIPDC [member]
Disclosure of transactions between related parties [line items]
Rental charge on leasehold	¥ 106,885	¥ 157,264	¥ 161,941
Drawdown of loans	0	210	0
Interest expense on loans	10	13,136	114,687
Subsidiaries of Huaneng Group [member]
Disclosure of transactions between related parties [line items]
Rental charge on leasehold	141,542	128,932	130,591
Rental income from leasehold	2,509	5,724	9,115
Drawdown of loans	15,374,480	4,035,000	2,660,500
Interest expense on loans	589,012	217,098	158,695
Interest income on loans	4,344	0	0
Capital injection from a subsidiary of Huaneng Group	274,752	0	286,312
Capital injection	0	157,500	683,550
Pre-construction cost paid by	23,529	765	12,254
Finance lease payments received from	0	2,960,000	100,000
A joint venture of the Company [member]
Disclosure of transactions between related parties [line items]
Rental charge on leasehold	2,128	0	0
Rental income from leasehold	7,448	7,750	10,759
Interest income on loans	3,329	3,488	4,572
Capital injection	249,716	18,200	0
Pre-construction cost paid by	179	0	0
Huaneng Group [member]
Disclosure of transactions between related parties [line items]
Drawdown of loans	665,225	0	0
Interest expense on loans	33,481	30,514	32,573
Entrusted management fee	13,453	24,950	24,950
Trusteeship management income	1,518	1,700	1,700
An associate of the Company [member]
Disclosure of transactions between related parties [line items]
Interest income on loans	917	0	0
Capital injection	52,200	100,418	206,230
Huangtai #8 Power Plant [member]
Disclosure of transactions between related parties [line items]
Net proceeds received from investee with significant influence	72,920	0	0
Finance lease to investee with significant influence	86,946	0	0
Interest income from finance lease	¥ 11,626	¥ 0	¥ 0

Related party balances and t193

Related party balances and transactions (Guarantees) (Detail) - CNY (¥) ¥ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Huaneng Group [member]
Disclosure of transactions between related parties [line items]
Long-term loans guaranteed by related parties	¥ 1,675,147	¥ 565,992
HIPDC [member]
Disclosure of transactions between related parties [line items]
Long-term loans guaranteed by related parties	2,099,600	2,142,000
Long-term bonds guaranteed by related parties	4,000,000	4,000,000
Government-related banks [member]
Disclosure of transactions between related parties [line items]
Long-term bonds guaranteed by related parties	¥ 0	¥ 3,300,000

Related party balances and t194

Related party balances and transactions (Pre-tax benefits and social insurance of key management personnel) (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Related party balances and transactions [abstract]
Salaries	¥ 7,676	¥ 8,225	¥ 9,064
Pension	1,511	1,521	1,470
Total	¥ 9,187	¥ 9,746	¥ 10,534

Related party balances and t195

Related party balances and transactions (Related party commitments) (Detail) - CNY (¥) ¥ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Disclosure of transactions between related parties [line items]
Fuel purchase and transportation commitments	¥ 1,391,057	¥ 1,254,338
Operating lease commitments	248,006	351,894
Subsidiaries of Huaneng Group [member]
Disclosure of transactions between related parties [line items]
Capital commitments	290,041	439,571
Fuel purchase and transportation commitments	1,111,649	963,306
Operating lease commitments	171,804	286,340
A joint venture of the Company [member]
Disclosure of transactions between related parties [line items]
Fuel purchase and transportation commitments	279,408	291,032
HIPDC [member]
Disclosure of transactions between related parties [line items]
Operating lease commitments	¥ 76,202	¥ 65,554

Labor cost (Detail)

Labor cost (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of labor cost [line items]
Amount of contributions paid by the Company and its subsidiaries charged to profit or loss	¥ 10,590,084	¥ 8,043,406	¥ 7,751,551
Publicly administered retirement plan for PRC employees [member]
Disclosure of labor cost [line items]
Amount of contributions paid by the Company and its subsidiaries	1,156,000	873,000
Amount of contributions paid by the Company and its subsidiaries charged to profit or loss	¥ 1,110,000	¥ 832,000
Publicly administered retirement plan for PRC employees [member] | Bottom of range [member]
Disclosure of labor cost [line items]
Contribution rate of employee benefits to basic salary	14.00%	14.00%
Publicly administered retirement plan for PRC employees [member] | Top of range [member]
Disclosure of labor cost [line items]
Contribution rate of employee benefits to basic salary	22.00%	22.00%
Supplementary defined contribution retirement scheme for PRC employees [member]
Disclosure of labor cost [line items]
Amount of contributions paid by the Company and its subsidiaries	¥ 312,000	¥ 244,000
Amount of contributions paid by the Company and its subsidiaries charged to profit or loss	299,000	233,000
Central provident funds for Singapore employees [member]
Disclosure of labor cost [line items]
Amount of contributions paid by the Company and its subsidiaries	19,920	18,470
Amount of contributions paid by the Company and its subsidiaries charged to profit or loss	¥ 19,920	¥ 18,470
Central provident funds for Singapore employees [member] | Bottom of range [member]
Disclosure of labor cost [line items]
Contribution rate of employee benefits to basic salary	6.50%	6.50%
Central provident funds for Singapore employees [member] | Top of range [member]
Disclosure of labor cost [line items]
Contribution rate of employee benefits to basic salary	16.00%	16.00%
Housing funds for employees [member]
Disclosure of labor cost [line items]
Amount of contributions paid by the Company and its subsidiaries	¥ 784,000	¥ 604,000
Amount of contributions paid by the Company and its subsidiaries charged to profit or loss	748,000	572,000
Social insurance for employees [member]
Disclosure of labor cost [line items]
Amount of contributions paid by the Company and its subsidiaries	901,000	699,000
Amount of contributions paid by the Company and its subsidiaries charged to profit or loss	¥ 857,000	¥ 664,000

Directors', supervisors' and197

Directors', supervisors' and senior management's emoluments (Detail)		12 Months Ended
		Dec. 31, 2017CNY (¥)employeesshares		Dec. 31, 2016CNY (¥)employeesshares	Dec. 31, 2015CNY (¥)
Pre-tax benefits and social insurance of directors and supervisors [line items]
Pension		¥ 1,511,000		¥ 1,521,000	¥ 1,470,000
Total		¥ 9,187,000		¥ 9,746,000	10,534,000
Option granted to the directors and supervisors | shares		0		0
Emolument as an inducement to join or upon joining the Company or as compensation for loss of office		¥ 0		¥ 0
Number of directors and supervisors waived or agreed to waive emoluments | employees		0		0
Directors and supervisors [member]
Pre-tax benefits and social insurance of directors and supervisors [line items]
Fees		¥ 490,000		¥ 610,000	662,000
Basic salaries		272,000		629,000	930,000
Performance salaries		930,000		1,023,000	1,805,000
Pension		247,000		299,000	410,000
Total		1,939,000		2,561,000	3,807,000
Name of director [member]
Pre-tax benefits and social insurance of directors and supervisors [line items]
Fees		442,000		514,000	548,000
Basic salaries		0		327,000	499,000
Performance salaries		0		396,000	1,157,000
Pension		0		122,000	254,000
Total		442,000		1,359,000	2,458,000
Mr. Cao Peixi [member]
Pre-tax benefits and social insurance of directors and supervisors [line items]
Fees		0		0	0
Basic salaries		0		0	0
Performance salaries		0		0	0
Pension		0		0	0
Total		0		0	0
Mr. Guo Junming [member]
Pre-tax benefits and social insurance of directors and supervisors [line items]
Fees		0	[1]	0	0
Basic salaries		0	[1]	0	0
Performance salaries		0	[1]	0	0
Pension		0	[1]	0	0
Total		0	[1]	0	0
Mr. Liu Guoyue [member]
Pre-tax benefits and social insurance of directors and supervisors [line items]
Fees		0		0	0
Basic salaries		0		0	143,000
Performance salaries		0		0	663,000
Pension		0		0	123,000
Total		0		0	929,000
Mr. Fan Xiaxia [member]
Pre-tax benefits and social insurance of directors and supervisors [line items]
Fees		0	[2]	0	0
Basic salaries		0	[2]	327,000	356,000
Performance salaries		0	[2]	396,000	494,000
Pension		0	[2]	122,000	131,000
Total		0	[2]	845,000	981,000
Mr. Li Shiqi [member]
Pre-tax benefits and social insurance of directors and supervisors [line items]
Fees		0	[3]	0	0
Basic salaries		0	[3]	0	0
Performance salaries		0	[3]	0	0
Pension		0	[3]	0	0
Total		0	[3]	0	0
Mr. Huang Jian [member]
Pre-tax benefits and social insurance of directors and supervisors [line items]
Fees		0		0	0
Basic salaries		0		0	0
Performance salaries		0		0	0
Pension		0		0	0
Total		0		0	0
Mr. Wang Yongxiang [member]
Pre-tax benefits and social insurance of directors and supervisors [line items]
Fees	[4]	0
Basic salaries	[4]	0
Performance salaries	[4]	0
Pension	[4]	0
Total	[4]	0
Mr. Mi Dabin [member]
Pre-tax benefits and social insurance of directors and supervisors [line items]
Fees		24,000		48,000	65,000
Basic salaries		0		0	0
Performance salaries		0		0	0
Pension		0		0	0
Total		24,000		48,000	65,000
Mr. Guo Hongbo [member]
Pre-tax benefits and social insurance of directors and supervisors [line items]
Fees		0		0	12,000
Basic salaries		0		0	0
Performance salaries		0		0	0
Pension		0		0	0
Total		0		0	12,000
Mr. Zhu Yousheng [member]
Pre-tax benefits and social insurance of directors and supervisors [line items]
Fees		24,000	[3]	48,000	24,000
Basic salaries		0	[3]	0	0
Performance salaries		0	[3]	0	0
Pension		0	[3]	0	0
Total		24,000	[3]	48,000	24,000
Mr. Xu Zujian [member]
Pre-tax benefits and social insurance of directors and supervisors [line items]
Fees					24,000
Basic salaries					0
Performance salaries					0
Pension					0
Total					24,000
Ms. Li Song [member]
Pre-tax benefits and social insurance of directors and supervisors [line items]
Fees		24,000	[3]	48,000	65,000
Basic salaries		0	[3]	0	0
Performance salaries		0	[3]	0	0
Pension		0	[3]	0	0
Total		24,000	[3]	48,000	65,000
Mr. Cheng Heng [member]
Pre-tax benefits and social insurance of directors and supervisors [line items]
Fees	[4]	0
Basic salaries	[4]	0
Performance salaries	[4]	0
Pension	[4]	0
Total	[4]	0
Mr. Lin Chong [member]
Pre-tax benefits and social insurance of directors and supervisors [line items]
Fees	[4]	0
Basic salaries	[4]	0
Performance salaries	[4]	0
Pension	[4]	0
Total	[4]	0
Mr. Li Zhensheng [member]
Pre-tax benefits and social insurance of directors and supervisors [line items]
Fees		37,000	[3]	74,000	74,000
Basic salaries		0	[3]	0	0
Performance salaries		0	[3]	0	0
Pension		0	[3]	0	0
Total		37,000	[3]	74,000	74,000
Mr. Qi Yudong [member]
Pre-tax benefits and social insurance of directors and supervisors [line items]
Fees					6,000
Basic salaries					0
Performance salaries					0
Pension					0
Total					6,000
Mr. Zhang Shouwen [member]
Pre-tax benefits and social insurance of directors and supervisors [line items]
Fees				37,000	74,000
Basic salaries				0	0
Performance salaries				0	0
Pension				0	0
Total				37,000	74,000
Mr. Yue Heng [member]
Pre-tax benefits and social insurance of directors and supervisors [line items]
Fees		74,000		74,000	100,000
Basic salaries		0		0	0
Performance salaries		0		0	0
Pension		0		0	0
Total		74,000		74,000	100,000
Ms. Zhang Lizi [member]
Pre-tax benefits and social insurance of directors and supervisors [line items]
Fees					30,000
Basic salaries					0
Performance salaries					0
Pension					0
Total					30,000
Mr. Geng Jianxin [member]
Pre-tax benefits and social insurance of directors and supervisors [line items]
Fees		37,000	[3]	74,000	37,000
Basic salaries		0	[3]	0	0
Performance salaries		0	[3]	0	0
Pension		0	[3]	0	0
Total		37,000	[3]	74,000	37,000
Mr. Xia Qing [member]
Pre-tax benefits and social insurance of directors and supervisors [line items]
Fees		37,000	[3]	74,000	37,000
Basic salaries		0	[3]	0	0
Performance salaries		0	[3]	0	0
Pension		0	[3]	0	0
Total		37,000	[3]	74,000	37,000
Mr. Xu Mengzhou [member]
Pre-tax benefits and social insurance of directors and supervisors [line items]
Fees		74,000		37,000
Basic salaries		0		0
Performance salaries		0		0
Pension		0		0
Total		74,000		37,000
Mr. Liu Jizhen [member]
Pre-tax benefits and social insurance of directors and supervisors [line items]
Fees	[4]	37,000
Basic salaries	[4]	0
Performance salaries	[4]	0
Pension	[4]	0
Total	[4]	37,000
Mr. Xu Haifeng [member]
Pre-tax benefits and social insurance of directors and supervisors [line items]
Fees	[4]	37,000
Basic salaries	[4]	0
Performance salaries	[4]	0
Pension	[4]	0
Total	[4]	37,000
Mr. Zhang Xianzhi [member]
Pre-tax benefits and social insurance of directors and supervisors [line items]
Fees	[4]	37,000
Basic salaries	[4]	0
Performance salaries	[4]	0
Pension	[4]	0
Total	[4]	37,000
Name of supervisor [member]
Pre-tax benefits and social insurance of directors and supervisors [line items]
Fees		48,000		96,000	114,000
Basic salaries		272,000		302,000	431,000
Performance salaries		930,000		627,000	648,000
Pension		247,000		177,000	156,000
Total		1,497,000		1,202,000	1,349,000
Mr. Ye Xiangdong [member]
Pre-tax benefits and social insurance of directors and supervisors [line items]
Fees		0		0	0
Basic salaries		0		0	0
Performance salaries		0		0	0
Pension		0		0	0
Total		0		0	0
Mr. Mu Xuan [member]
Pre-tax benefits and social insurance of directors and supervisors [line items]
Fees		24,000		48,000	65,000
Basic salaries		0		0	0
Performance salaries		0		0	0
Pension		0		0	0
Total		24,000		48,000	65,000
Ms. Zhang Mengjiao [member]
Pre-tax benefits and social insurance of directors and supervisors [line items]
Fees		0		0	0
Basic salaries		0		0	0
Performance salaries		0		0	0
Pension		0		0	0
Total		0		0	0
Mr. Gu Jianguo [member]
Pre-tax benefits and social insurance of directors and supervisors [line items]
Fees		24,000		48,000	49,000
Basic salaries		0		0	0
Performance salaries		0		0	0
Pension		0		0	0
Total		24,000		48,000	49,000
Mr. Wang Zhaobin [member]
Pre-tax benefits and social insurance of directors and supervisors [line items]
Fees				0	0
Basic salaries				51,000	298,000
Performance salaries				0	385,000
Pension				0	103,000
Total				51,000	786,000
Ms. Zhang Ling [member]
Pre-tax benefits and social insurance of directors and supervisors [line items]
Fees				0	0
Basic salaries				69,000	133,000
Performance salaries				0	263,000
Pension				0	53,000
Total				69,000	¥ 449,000
Ms. Zhang Xiaojun [member]
Pre-tax benefits and social insurance of directors and supervisors [line items]
Fees		0		0
Basic salaries		137,000		92,000
Performance salaries		466,000		314,000
Pension		124,000		89,000
Total		727,000		495,000
Mr. Zhu Daqing [member]
Pre-tax benefits and social insurance of directors and supervisors [line items]
Fees		0		0
Basic salaries		135,000		90,000
Performance salaries		464,000		313,000
Pension		123,000		88,000
Total		¥ 722,000		¥ 491,000
[1]	Resigned on 9 October 2017.
[2]	Resigned on 28 February 2018
[3]	Resigned on 13 June 2017.
[4]	Appointed on 13 June 2017.

Directors', supervisors' and198

Directors', supervisors' and senior management's emoluments (Five highest paid individuals) (Detail) ¥ / employees in Thousands, ¥ in Thousands	12 Months Ended
	Dec. 31, 2017CNY (¥)¥ / employeesemployees	Dec. 31, 2016CNY (¥)employees	Dec. 31, 2015CNY (¥)
Five highest paid individuals [line items]
Pension	¥ 1,511	¥ 1,521	¥ 1,470
Total	¥ 9,187	¥ 9,746	10,534
Five highest paid individuals [member]
Five highest paid individuals [line items]
Number of directors | employees	0	1
Number of non-directors | employees	5	4
Basic salaries	¥ 1,524	¥ 1,213	910
Performance salaries	1,800	1,440	1,260
Pension	648	502	365
Total	¥ 3,972	¥ 3,155	¥ 2,535
Five highest paid individuals [member] | Bottom of range [member]
Five highest paid individuals [line items]
Emoluments payable to each person of five highest paid individuals | ¥ / employees	0
Five highest paid individuals [member] | Top of range [member]
Five highest paid individuals [line items]
Emoluments payable to each person of five highest paid individuals | ¥ / employees	790

Commitments (Capital commitment

Commitments (Capital commitments) (Detail) - CNY (¥) ¥ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Commitments [abstract]
Contracted but not provided	¥ 16,985,439	¥ 18,603,559

Commitments (Operating lease co

Commitments (Operating lease commitments) (Detail) - CNY (¥) ¥ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Disclosure of operating lease commitments [line items]
Total future minimum lease payments under non-cancelable operating leases	¥ 1,486,784	¥ 1,430,409
Not later than one year [member]
Disclosure of operating lease commitments [line items]
Total future minimum lease payments under non-cancelable operating leases	196,870	181,441
Later than one year and not later than two years [member]
Disclosure of operating lease commitments [line items]
Total future minimum lease payments under non-cancelable operating leases	118,272	144,088
Later than two years and not later than five years [member]
Disclosure of operating lease commitments [line items]
Total future minimum lease payments under non-cancelable operating leases	143,628	133,984
Later than five years [member]
Disclosure of operating lease commitments [line items]
Total future minimum lease payments under non-cancelable operating leases	¥ 1,028,014	¥ 970,896

Commitments (Operating lease201

Commitments (Operating lease commitments) (Narrative) (Detail) - Land operating lease agreement signed by Huaneng Dezhou Power Plant and Shandong Land Bureau [member] - CNY (¥) ¥ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of operating lease commitments [line items]
Duration of contracts	30-year
Increment for each rental revision of the previous annual rental amount	30.00%
Original annual rentals	¥ 30
Revised annual rentals	¥ 34	¥ 34

Commitments (Fuel purchase comm

Commitments (Fuel purchase commitments) (Detail)		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Government-related enterprise one, agreement one [member]
Disclosure on purchase commitments by suppliers [line items]
Periods		2018-2039	2017-2039
Purchase quantities	[1]	2.8 million m3/day	2.8 million m3/day
Estimated unit costs (RMB)		2.21/ m3	2.31/ m3
Government-related enterprise two, agreement one [member]
Disclosure on purchase commitments by suppliers [line items]
Periods		2018-2023	2017-2023
Purchase quantities	[1]	541 million m3/day	541 million m3/day
Estimated unit costs (RMB)		2.06/ m3	2.16/ m3
Government-related enterprise two, agreement two [member]
Disclosure on purchase commitments by suppliers [line items]
Periods		2018-2023	2017-2023
Purchase quantities	[1]	450 million m3/day	450 million m3/day
Estimated unit costs (RMB)		2.06/ m3	2.16/ m3
Government-related enterprise two, agreement three [member]
Disclosure on purchase commitments by suppliers [line items]
Periods		2018-2023
Purchase quantities	[1]	541 million m3/day
Estimated unit costs (RMB)		2.10/ m3
Government-related enterprise two, agreement four [member]
Disclosure on purchase commitments by suppliers [line items]
Periods		2018-2023
Purchase quantities	[1]	450 million m3/day
Estimated unit costs (RMB)		2.27/ m3
Government-related enterprise three, agreement one [member]
Disclosure on purchase commitments by suppliers [line items]
Periods		2018-2026
Purchase quantities	[1]	200 million m3/day
Estimated unit costs (RMB)		2.38/ m3
Other suppliers, agreement one [member]
Disclosure on purchase commitments by suppliers [line items]
Periods		2018-2019
Purchase quantities	[2]	243 BBtu/day
Estimated unit costs (RMB)		approximately 67,000/BBtu
Other suppliers, agreement two [member]
Disclosure on purchase commitments by suppliers [line items]
Periods		2020-2021
Purchase quantities	[2]	242 BBtu/day
Estimated unit costs (RMB)		approximately 67,000/BBtu
Other suppliers, agreement three [member]
Disclosure on purchase commitments by suppliers [line items]
Periods		2,022
Purchase quantities	[2]	248 BBtu/day
Estimated unit costs (RMB)		approximately 67,000/BBtu
Other suppliers, agreement four [member]
Disclosure on purchase commitments by suppliers [line items]
Periods		2,023	2,023
Purchase quantities	[2]	247.5~256.6 BBtu/day	247.5~256.6 BBtu/day
Estimated unit costs (RMB)		approximately 67,000/BBtu	approximately 63,000/BBtu
Other suppliers, agreement five [member]
Disclosure on purchase commitments by suppliers [line items]
Periods		2024-2028	2024-2028
Purchase quantities	[2]	49.9~81.5 BBtu/day	49.9~59.0 BBtu/day
Estimated unit costs (RMB)		approximately 69,000/BBtu	approximately 70,000/BBtu
Other suppliers, agreement six [member]
Disclosure on purchase commitments by suppliers [line items]
Periods			2017-2022
Purchase quantities	[2]		248 BBtu/day
Estimated unit costs (RMB)			approximately 63,000/BBtu
[1]	The quantities represent maximum volume, others represent minimum or forecasted volume if not specified.
[2]	BBtu: Billion British Thermal Unit.

Business combinations (Acquisit

Business combinations (Acquisition from Huaneng Group) (Narrative) (Detail) - CNY (¥)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about business combination [line items]
Other receivables and assets recorded for contingent consideration	¥ 615,013,000	¥ 0
Other non-current assets recorded for contingent consideration	244,533,000	0
Acquisition from Huaneng Group [member]
Disclosure of detailed information about business combination [line items]
Revenue	31,207,000,000
Net loss	1,051,000,000
Goodwill expected to be deductible for tax purposes	0
Fair value of contingent consideration from Huaneng Group	860,000,000	¥ 0
Other receivables and assets recorded for contingent consideration	615,000,000
Other non-current assets recorded for contingent consideration	245,000,000
Acquisition related cost	¥ 26,000,000
Shandong Power [member]
Disclosure of detailed information about business combination [line items]
Equity interests acquired by the Company	80.00%
Jilin Power [member]
Disclosure of detailed information about business combination [line items]
Equity interests acquired by the Company	100.00%
Heilongjiang Power [member]
Disclosure of detailed information about business combination [line items]
Equity interests acquired by the Company	100.00%
Zhongyuan Gas [member]
Disclosure of detailed information about business combination [line items]
Equity interests acquired by the Company	90.00%

Business combinations (Acqui204

Business combinations (Acquisition from Huaneng Group) (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of detailed information about business combination [line items]
Cash consideration paid for acquisition of subsidiaries, net of cash acquired	¥ 10,817,107	¥ (157,421)	¥ 8,887,882
Acquisition from Huaneng Group [member]
Disclosure of detailed information about business combination [line items]
Total consideration	15,500,770
Non-controlling interests	6,292,577
Less: Fair value of total identifiable net assets	19,316,748
Goodwill	3,167,566
Total consideration	15,500,770
Less: Net settlement of the receivables due from Huaneng Group	2,361,871
Bank balances and cash of acquirees	2,342,766
Less: Restricted cash	(20,974)
Cash consideration paid for acquisition of subsidiaries, net of cash acquired	10,817,107
A subsidiary of Shandong Power [member]
Disclosure of detailed information about business combination [line items]
Fair value of pre-existing interest in subsidiaries	¥ 690,967

Business combinations (Acqui205

Business combinations (Acquisition from Huaneng Group) (Assets and liabilities arising from acquisitions) (Detail) ¥ in Thousands	Dec. 31, 2017CNY (¥)
Shandong Power [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	¥ 16,319,629
Shandong Power [member] | Property, plant and equipment [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	41,366,757
Shandong Power [member] | Investment in associates and joint ventures [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	1,021,566
Shandong Power [member] | Available-for-sale financial assets [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	4,000
Shandong Power [member] | Land use rights [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	2,272,181
Shandong Power [member] | Deferred income tax assets [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	334,055
Shandong Power [member] | Other non-current assets [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	1,285,838
Shandong Power [member] | Bank balances and cash [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	1,621,276
Shandong Power [member] | Inventories [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	952,510
Shandong Power [member] | Trade receivables [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	2,509,641
Shandong Power [member] | Other receivables and other current assets [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	2,992,094
Shandong Power [member] | Long-term borrowings [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	(15,647,367)
Shandong Power [member] | Deferred income tax liabilities [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	(2,447,672)
Shandong Power [member] | Other non-current liabilities [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	(1,688,306)
Shandong Power [member] | Short-term borrowings [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	(8,082,200)
Shandong Power [member] | Tax payables [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	(270,531)
Shandong Power [member] | Dividends payables [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	(136,955)
Shandong Power [member] | Salary and welfare payables [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	(41,667)
Shandong Power [member] | Payables and other liabilities [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	(9,725,591)
Jilin Power [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	404,107
Jilin Power [member] | Property, plant and equipment [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	8,496,028
Jilin Power [member] | Investment in associates and joint ventures [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	0
Jilin Power [member] | Available-for-sale financial assets [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	100,895
Jilin Power [member] | Land use rights [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	228,173
Jilin Power [member] | Deferred income tax assets [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	323,522
Jilin Power [member] | Other non-current assets [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	213,589
Jilin Power [member] | Bank balances and cash [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	103,045
Jilin Power [member] | Inventories [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	89,333
Jilin Power [member] | Trade receivables [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	293,455
Jilin Power [member] | Other receivables and other current assets [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	2,393,835
Jilin Power [member] | Long-term borrowings [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	(8,330,929)
Jilin Power [member] | Deferred income tax liabilities [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	(214,642)
Jilin Power [member] | Other non-current liabilities [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	(10,291)
Jilin Power [member] | Short-term borrowings [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	(600,000)
Jilin Power [member] | Tax payables [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	(10,311)
Jilin Power [member] | Dividends payables [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	0
Jilin Power [member] | Salary and welfare payables [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	(2,969)
Jilin Power [member] | Payables and other liabilities [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	(2,668,626)
Heilongjiang Power [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	2,570,630
Heilongjiang Power [member] | Property, plant and equipment [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	12,525,071
Heilongjiang Power [member] | Investment in associates and joint ventures [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	0
Heilongjiang Power [member] | Available-for-sale financial assets [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	0
Heilongjiang Power [member] | Land use rights [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	655,485
Heilongjiang Power [member] | Deferred income tax assets [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	10,404
Heilongjiang Power [member] | Other non-current assets [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	210,965
Heilongjiang Power [member] | Bank balances and cash [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	385,295
Heilongjiang Power [member] | Inventories [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	123,889
Heilongjiang Power [member] | Trade receivables [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	127,219
Heilongjiang Power [member] | Other receivables and other current assets [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	889,392
Heilongjiang Power [member] | Long-term borrowings [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	(6,742,580)
Heilongjiang Power [member] | Deferred income tax liabilities [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	(280,945)
Heilongjiang Power [member] | Other non-current liabilities [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	(253,671)
Heilongjiang Power [member] | Short-term borrowings [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	(1,920,000)
Heilongjiang Power [member] | Tax payables [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	(54,302)
Heilongjiang Power [member] | Dividends payables [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	0
Heilongjiang Power [member] | Salary and welfare payables [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	(22,462)
Heilongjiang Power [member] | Payables and other liabilities [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	(3,083,130)
Zhongyuan Gas [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	22,382
Zhongyuan Gas [member] | Property, plant and equipment [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	1,381,060
Zhongyuan Gas [member] | Investment in associates and joint ventures [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	0
Zhongyuan Gas [member] | Available-for-sale financial assets [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	0
Zhongyuan Gas [member] | Land use rights [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	27,075
Zhongyuan Gas [member] | Deferred income tax assets [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	0
Zhongyuan Gas [member] | Other non-current assets [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	48
Zhongyuan Gas [member] | Bank balances and cash [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	222,939
Zhongyuan Gas [member] | Inventories [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	1,136
Zhongyuan Gas [member] | Trade receivables [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	124,636
Zhongyuan Gas [member] | Other receivables and other current assets [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	119,974
Zhongyuan Gas [member] | Long-term borrowings [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	(1,200,000)
Zhongyuan Gas [member] | Deferred income tax liabilities [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	(47,235)
Zhongyuan Gas [member] | Other non-current liabilities [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	0
Zhongyuan Gas [member] | Short-term borrowings [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	0
Zhongyuan Gas [member] | Tax payables [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	(419)
Zhongyuan Gas [member] | Dividends payables [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	0
Zhongyuan Gas [member] | Salary and welfare payables [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	(717)
Zhongyuan Gas [member] | Payables and other liabilities [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	¥ (606,115)

Business combinations (Subsidia

Business combinations (Subsidiary transferred from joint venture) (Detail) - Shanxi Xiaoyi Energy [member] ¥ in Thousands	12 Months Ended
	Dec. 31, 2017CNY (¥)
Disclosure of detailed information about business combination [line items]
Equity interests held by non-controlling shareholder	49.00%
Non-controlling interests	¥ 10
Fair value of pre-existing interest in subsidiaries	10,200
Less: Fair value of total identifiable net assets	10,210
Goodwill	¥ 0

Business combinations (Subsi207

Business combinations (Subsidiary transferred from joint venture) (Financial information) (Detail) - Shanxi Xiaoyi Energy [member] ¥ in Thousands	12 Months Ended
	Dec. 31, 2017CNY (¥)
Disclosure of detailed information about business combination [line items]
Revenue	¥ 704
Net Profit	¥ 228

Business combinations (Subsi208

Business combinations (Subsidiary transferred from joint venture) (Identifiable assets and liabilities of acquiree as at acquisition date) (Detail) - Shanxi Xiaoyi Energy [member] ¥ in Thousands	Dec. 31, 2017CNY (¥)
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	¥ 10,210
Bank balances and cash [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	10,211
Accounts payable and other liabilities [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	¥ (1)

Business combinations (Acqui209

Business combinations (Acquisition of Ruzhou Xuji Wind Power Generation Co., Ltd.) (Narrative) (Detail) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017CNY (¥)
Huaneng Ruzhou Clean Energy Co., Ltd. ("Ruzhou Clean Energy") [member]
Disclosure of detailed information about business combination [line items]
Contribution committed by the Company for equity of subsidiaries	¥ 76,000
Percentage of interest held by the Company	95.00%	[1]
Proportion of ownership interests held by non-controlling interests	5.00%
Ruzhou Xuji Wind Power Generation [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	¥ 4,000
[1]	These companies were newly established in 2017.

Business combinations (Acqui210

Business combinations (Acquisition of Ruzhou Xuji Wind Power Generation Co., Ltd.) (Detail) - Ruzhou Xuji Wind Power Generation [member] ¥ in Thousands	Dec. 31, 2017CNY (¥)
Disclosure of detailed information about business combination [line items]
Consideration	¥ 4,000
Less: Fair value of total identifiable net assets	4,000
Goodwill	¥ 0

Business combinations (Acqui211

Business combinations (Acquisition of Ruzhou Xuji Wind Power Generation Co., Ltd.) (Financial information) (Detail) - Ruzhou Xuji Wind Power Generation [member] ¥ in Thousands	12 Months Ended
	Dec. 31, 2017CNY (¥)
Disclosure of detailed information about business combination [line items]
Revenue	¥ 0
Net Profit	¥ 0

Business combinations (Acqui212

Business combinations (Acquisition of Ruzhou Xuji Wind Power Generation Co., Ltd.) (Identifiable assets and liabilities of acquiree as at acquisition date) (Detail) - Ruzhou Xuji Wind Power Generation [member] ¥ in Thousands	Dec. 31, 2017CNY (¥)
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	¥ 4,000
Other receivables and assets [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	16,080
Property, plant and equipment [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	11,893
Accounts payable and other liabilities [member]
Disclosure of detailed information about business combination [line items]
Total identifiable net assets, Fair Value	¥ (23,973)

Non-controlling interests (Deta

Non-controlling interests (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Disclosure of the information relating to each of the Company and subsidiaries that have material non-controlling interests [line items]
Non-current assets	¥ 348,051,801	¥ 277,873,123
Current assets	48,537,710	36,966,616
Non-current liabilities	(133,024,419)	(82,456,751)
Current liabilities	(155,950,488)	(130,196,251)
Carrying amount of NCI	19,973,038	16,183,742
Revenue	152,459,444	113,814,236	[1]	¥ 128,904,873	[1]
Net (loss) /profit	1,584,207	10,347,987		17,259,107
Total comprehensive (loss) /income	998,993	10,833,271		18,414,967
(Loss) /profit allocated to NCI	4,371	1,827,560		3,607,174
Other comprehensive (loss) /income allocated to NCI	(28,496)	484
Cash flow from operating activities	29,197,363	31,510,824		42,362,708
Cash flow from investment activities	(31,748,825)	(17,649,646)		(33,015,012)
Cash flow from financing activities	4,013,180	(13,601,850)		(14,140,659)
Net increase/ (decrease) in cash and cash equivalents	¥ 1,471,889	¥ 332,251		¥ (4,760,117)
Qinbei Power [member]
Disclosure of the information relating to each of the Company and subsidiaries that have material non-controlling interests [line items]
NCI percentage	40.00%	40.00%
Non-current assets	¥ 10,553,775	¥ 11,210,604
Current assets	1,738,000	1,472,192
Non-current liabilities	(3,053,535)	(2,206,586)
Current liabilities	(5,821,543)	(6,475,340)
Net assets	3,416,697	4,000,870
Carrying amount of NCI	1,380,594	1,614,264
Revenue	4,587,612	5,006,349
Net (loss) /profit	(169,261)	457,311
Total comprehensive (loss) /income	(169,261)	457,311
(Loss) /profit allocated to NCI	(67,704)	182,924
Other comprehensive (loss) /income allocated to NCI	0	0
Cash flow from operating activities	970,585	1,400,042
Cash flow from investment activities	(252,441)	(312,604)
Cash flow from financing activities	(613,010)	(1,247,836)
Net increase/ (decrease) in cash and cash equivalents	105,134	(160,398)
Dividends paid to NCI	¥ 150,000	¥ 433,090
Beijing Cogeneration [member]
Disclosure of the information relating to each of the Company and subsidiaries that have material non-controlling interests [line items]
NCI percentage	59.00%	59.00%
Non-current assets	¥ 6,841,918	¥ 5,821,110
Current assets	1,257,485	1,041,957
Non-current liabilities	(394,590)	(152,911)
Current liabilities	(2,501,516)	(1,665,750)
Net assets	5,203,297	5,044,406
Carrying amount of NCI	3,050,283	2,928,015
Revenue	4,262,547	4,476,729
Net (loss) /profit	541,602	788,899
Total comprehensive (loss) /income	541,602	788,899
(Loss) /profit allocated to NCI	319,545	465,450
Other comprehensive (loss) /income allocated to NCI	0	0
Cash flow from operating activities	1,071,888	973,352
Cash flow from investment activities	(1,190,093)	(540,151)
Cash flow from financing activities	70,299	(344,718)
Net increase/ (decrease) in cash and cash equivalents	(49,605)	88,518
Dividends paid to NCI	¥ 532,966	¥ 687,679
Luohuang Power [member]
Disclosure of the information relating to each of the Company and subsidiaries that have material non-controlling interests [line items]
NCI percentage	40.00%	40.00%
Non-current assets	¥ 4,055,507	¥ 3,966,880
Current assets	887,225	864,069
Non-current liabilities	(242,944)	(284,064)
Current liabilities	(2,064,897)	(1,601,236)
Net assets	2,634,891	2,945,649
Carrying amount of NCI	1,032,938	1,157,242
Revenue	2,303,079	2,436,586
Net (loss) /profit	(60,758)	122,508
Total comprehensive (loss) /income	(60,758)	122,508
(Loss) /profit allocated to NCI	(24,303)	49,003
Other comprehensive (loss) /income allocated to NCI	0	0
Cash flow from operating activities	195,282	550,346
Cash flow from investment activities	(383,004)	(189,599)
Cash flow from financing activities	156,483	(319,643)
Net increase/ (decrease) in cash and cash equivalents	(31,239)	41,104
Dividends paid to NCI	¥ 0	¥ 120,000
Weihai Power [member]
Disclosure of the information relating to each of the Company and subsidiaries that have material non-controlling interests [line items]
NCI percentage	40.00%	40.00%
Non-current assets	¥ 4,664,868	¥ 4,988,112
Current assets	633,012	508,493
Non-current liabilities	(81,048)	(104,952)
Current liabilities	(2,462,363)	(2,504,410)
Net assets	2,754,469	2,887,243
Carrying amount of NCI	1,101,787	1,154,897
Revenue	3,421,115	3,217,209
Net (loss) /profit	324,335	507,900
Total comprehensive (loss) /income	324,335	507,900
(Loss) /profit allocated to NCI	129,734	203,160
Other comprehensive (loss) /income allocated to NCI	0	0
Cash flow from operating activities	681,568	1,045,828
Cash flow from investment activities	(231,142)	(273,117)
Cash flow from financing activities	(405,196)	(786,471)
Net increase/ (decrease) in cash and cash equivalents	45,230	(13,760)
Dividends paid to NCI	¥ 160,000	¥ 366,983
Jinling Power [member]
Disclosure of the information relating to each of the Company and subsidiaries that have material non-controlling interests [line items]
NCI percentage	40.00%	40.00%
Non-current assets	¥ 5,049,079	¥ 5,426,759
Current assets	494,312	649,446
Non-current liabilities	(1,541,444)	(1,773,332)
Current liabilities	(1,854,441)	(1,835,090)
Net assets	2,147,506	2,467,783
Carrying amount of NCI	859,024	987,135
Revenue	3,423,688	3,734,108
Net (loss) /profit	269,949	655,568
Total comprehensive (loss) /income	269,949	655,568
(Loss) /profit allocated to NCI	107,980	262,227
Other comprehensive (loss) /income allocated to NCI	0	0
Cash flow from operating activities	731,714	1,293,565
Cash flow from investment activities	(47,518)	(37,274)
Cash flow from financing activities	(680,226)	(1,255,955)
Net increase/ (decrease) in cash and cash equivalents	3,970	336
Dividends paid to NCI	¥ 179,023	¥ 308,923
Yueyang Power [member]
Disclosure of the information relating to each of the Company and subsidiaries that have material non-controlling interests [line items]
NCI percentage	45.00%	45.00%
Non-current assets	¥ 4,875,004	¥ 4,958,325
Current assets	987,812	826,089
Non-current liabilities	(1,042,093)	(1,150,021)
Current liabilities	(2,590,470)	(1,828,581)
Net assets	2,230,253	2,805,812
Carrying amount of NCI	1,019,016	1,260,591
Revenue	3,149,190	2,716,817
Net (loss) /profit	47,224	243,913
Total comprehensive (loss) /income	47,224	243,913
(Loss) /profit allocated to NCI	21,251	109,761
Other comprehensive (loss) /income allocated to NCI	0	0
Cash flow from operating activities	426,437	568,379
Cash flow from investment activities	(242,288)	(62,622)
Cash flow from financing activities	(191,231)	(521,249)
Net increase/ (decrease) in cash and cash equivalents	(7,082)	(15,492)
Dividends paid to NCI	¥ 65,675	¥ 0
Shidongkou Power [member]
Disclosure of the information relating to each of the Company and subsidiaries that have material non-controlling interests [line items]
NCI percentage	50.00%	50.00%
Non-current assets	¥ 3,712,623	¥ 3,917,340
Current assets	494,073	380,641
Non-current liabilities	(731,640)	(1,055,640)
Current liabilities	(1,919,701)	(1,584,142)
Net assets	1,555,355	1,658,199
Carrying amount of NCI	777,678	829,099
Revenue	2,117,052	1,915,915
Net (loss) /profit	164,557	297,211
Total comprehensive (loss) /income	164,557	297,211
(Loss) /profit allocated to NCI	82,278	148,606
Other comprehensive (loss) /income allocated to NCI	0	0
Cash flow from operating activities	311,668	890,615
Cash flow from investment activities	(93,434)	(258,892)
Cash flow from financing activities	(384,317)	(462,075)
Net increase/ (decrease) in cash and cash equivalents	(166,083)	169,648
Dividends paid to NCI	¥ 133,700	¥ 273,900
Yangliuqing Cogeneration [member]
Disclosure of the information relating to each of the Company and subsidiaries that have material non-controlling interests [line items]
NCI percentage	45.00%	45.00%
Non-current assets	¥ 2,541,803	¥ 2,654,085
Current assets	497,441	563,023
Non-current liabilities	(205,205)	(224,373)
Current liabilities	(869,071)	(991,614)
Net assets	1,964,968	2,001,121
Carrying amount of NCI	883,340	899,609
Revenue	2,010,872	1,773,869
Net (loss) /profit	121,853	177,447
Total comprehensive (loss) /income	121,853	177,447
(Loss) /profit allocated to NCI	54,834	79,851
Other comprehensive (loss) /income allocated to NCI	0	0
Cash flow from operating activities	334,842	295,547
Cash flow from investment activities	(64,179)	(197,600)
Cash flow from financing activities	(288,299)	(58,293)
Net increase/ (decrease) in cash and cash equivalents	(17,586)	39,616
Dividends paid to NCI	¥ 71,103	128,857
Shandong Power [member]
Disclosure of the information relating to each of the Company and subsidiaries that have material non-controlling interests [line items]
NCI percentage	20.00%
Non-current assets	¥ 47,665,952
Current assets	6,891,086
Non-current liabilities	(19,681,891)
Current liabilities	(18,695,005)
Net assets	16,180,142
Carrying amount of NCI	4,697,283
Revenue	22,566,737
Net (loss) /profit	(800,622)
Total comprehensive (loss) /income	(943,860)
(Loss) /profit allocated to NCI	(287,923)
Other comprehensive (loss) /income allocated to NCI	(28,648)
Cash flow from operating activities	3,848,712
Cash flow from investment activities	(3,967,060)
Cash flow from financing activities	(282,625)
Net increase/ (decrease) in cash and cash equivalents	(402,950)
Dividends paid to NCI	220,321
Other individually immaterial subsidiaries [member]
Disclosure of the information relating to each of the Company and subsidiaries that have material non-controlling interests [line items]
Carrying amount of NCI	5,171,095	5,352,890
(Loss) /profit allocated to NCI	(331,321)	326,578
Other comprehensive (loss) /income allocated to NCI	¥ 152	¥ 484
[1]	Restated. The Company completed the acquisition of equity interests of four companies from Huaneng Group, see Note 40 for details. As the acquisition is a business combination under common control, the transaction is accounted for under merger accounting method under PRC GAAP. The assets and liabilities acquired in business combinations are measured at the carrying amounts of the acquirees in the consolidated financial statements of the ultimate controlling party on the acquisition date. The operating results for all periods presented are retrospectively restated as if the current structure and operations resulting from the acquisition had been in existence from the date when the acquirees first became under the control of the same ultimate controlling party. Therefore the relevant comparative figures in the segment information were restated under PRC GAAP while the acquisition is accounted for using acquisition method under IFRS.

Subsequent events (Guarantee ag

Subsequent events (Guarantee agreement) (Detail) $ in Millions	Dec. 31, 2017USD ($)
Industrial and Commercial Bank of China Limited [member]
Disclosure of non-adjusting events after reporting period [line items]
Amount of guarantee for short-term loans	$ 100

Subsequent events (Super short-

Subsequent events (Super short-term bonds) (Detail) - Issue super short-term bonds [member] ¥ / shares in Units, ¥ in Billions	1 Months Ended
	Feb. 28, 2018CNY (¥)¥ / shares
Super short-term bond with maturity of 90 days issued in February 2018 [member]
Disclosure of non-adjusting events after reporting period [line items]
Face value | ¥	¥ 4
Annual interest rate	4.35%
Maturity	90 days
Par value | ¥ / shares	¥ 100
Super short-term bond with maturity of 90 days issued in March 2018 [member]
Disclosure of non-adjusting events after reporting period [line items]
Face value | ¥	¥ 2
Annual interest rate	4.35%
Maturity	90 days
Par value | ¥ / shares	¥ 100