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Investments in Associates (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of associates [Line Items]    
Acquisition cost ₩ 2,338,421 ₩ 2,240,761
Book value    
Beginning balance 3,837,421 4,092,252
Acquisition 82,283 85,509
Disposal 0 (9,933)
Dividends received (73,049) (32,065)
Share of income (loss) 216,009 (212,629)
Other comprehensive income (loss) 14,148 (94,337)
Others (book value) (11,992) 8,624
Ending balance ₩ 4,064,820 ₩ 3,837,421
Korea Gas Corporation    
Disclosure of associates [Line Items]    
Key operation activities [1] Importing and wholesaling LNG Importing and wholesaling LNG
Location [1] KOREA KOREA
Percentage of ownership [1],[2] 20.47% 20.47%
Acquisition cost [1] ₩ 94,500 ₩ 94,500
Book value    
Beginning balance 1,618,868 [1] 1,933,877
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 107,952 (242,232)
Other comprehensive income (loss) (24,843) (72,648)
Others (book value) (129) (129)
Ending balance [1] 1,701,848 1,618,868
The fair value of associates [3] 910,980 804,195
Share in net assets 1,834,141 1,755,887
Total assets 39,689,692 [4] 37,139,439
Total liabilities 31,186,488 [4] 28,999,025
Net assets 8,503,204 8,140,414
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) (132,293) (137,019)
Sales of Associates 26,185,038 [4] 22,172,305
Profit (loss) for the period of Associates ₩ 523,480 [4] ₩ (1,205,110)
Korea Electric Power Industrial Development Co., Ltd.    
Disclosure of associates [Line Items]    
Key operation activities Electricity metering and others Electricity metering and others
Location KOREA KOREA
Percentage of ownership [2] 29.00% 29.00%
Acquisition cost ₩ 4,727 ₩ 4,727
Book value    
Beginning balance 21,838 20,475
Acquisition 0 0
Disposal 0 0
Dividends received (1,872) (2,061)
Share of income (loss) 2,584 3,428
Other comprehensive income (loss) (102) 102
Others (book value) (610) (106)
Ending balance 21,838 21,838
The fair value of associates 33,609 38,667
Share in net assets 21,838 21,838
Total assets 144,425 155,033
Total liabilities 69,123 79,730
Net assets 75,302 75,303
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) 0 0
Sales of Associates 325,694 334,547
Profit (loss) for the period of Associates ₩ 9,987 ₩ 16,126
YTN Co., Ltd.    
Disclosure of associates [Line Items]    
Key operation activities Broadcasting Broadcasting
Location KOREA KOREA
Percentage of ownership [2] 21.43% 21.43%
Acquisition cost ₩ 59,000 ₩ 59,000
Book value    
Beginning balance 40,606 38,156
Acquisition 0 0
Disposal 0 0
Dividends received (180) (135)
Share of income (loss) 545 1,095
Other comprehensive income (loss) (186) 929
Others (book value) (447) 561
Ending balance 40,338 40,606
The fair value of associates 18,900 18,855
Share in net assets 40,346 40,624
Total assets 286,964 298,122
Total liabilities 98,682 108,554
Net assets 188,282 189,568
Investment differential 0 0
Intercompany transaction (6) (18)
Others (consolidated FS) (2) 0
Sales of Associates 132,382 131,080
Profit (loss) for the period of Associates ₩ 1,587 ₩ 3,638
Cheongna Energy Co., Ltd.    
Disclosure of associates [Line Items]    
Key operation activities Generating and distributing vapor and hot/cold water Generating and distributing vapor and hot/cold water
Location KOREA KOREA
Percentage of ownership [2] 43.90% 43.90%
Acquisition cost ₩ 48,353 ₩ 48,353
Book value    
Beginning balance 8,337 12,373
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) (4,872) (4,036)
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 3,465 8,337
Share in net assets 1,015 5,893
Total assets 431,234 461,958
Total liabilities 428,921 448,535
Net assets 2,313 13,423
Investment differential 2,584 2,584
Intercompany transaction (134) (140)
Others (consolidated FS) 0 0
Sales of Associates 64,594 56,533
Profit (loss) for the period of Associates ₩ (11,110) ₩ (9,203)
Gangwon Wind Power Co., Ltd.    
Disclosure of associates [Line Items]    
Key operation activities [5] Power generation Power generation
Location [5] KOREA KOREA
Percentage of ownership [2],[5] 15.00% 15.00%
Acquisition cost [5] ₩ 5,725 ₩ 5,725
Book value    
Beginning balance 13,855 [5] 13,069
Acquisition 0 0
Disposal 0 0
Dividends received (2,272) (852)
Share of income (loss) 1,637 1,638
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance [5] 13,220 13,855
Share in net assets 13,171 13,806
Total assets 89,614 94,281
Total liabilities 1,805 2,243
Net assets 87,809 92,038
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) 49 49
Sales of Associates 25,407 25,963
Profit (loss) for the period of Associates ₩ 10,926 ₩ 11,121
Hyundai Green Power Co., Ltd.    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership [2] 29.00% 29.00%
Acquisition cost ₩ 88,885 ₩ 88,885
Book value    
Beginning balance 114,806 115,998
Acquisition 0 0
Disposal 0 0
Dividends received (8,889) (8,889)
Share of income (loss) 21,243 7,697
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 127,160 114,806
Share in net assets 127,160 114,806
Total assets 1,127,220 1,150,729
Total liabilities 688,738 754,846
Net assets 438,482 395,883
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) 0 0
Sales of Associates 501,798 477,373
Profit (loss) for the period of Associates ₩ 66,925 ₩ 26,543
Shareholders' agreements that may cause future economic resource or cash outflows As of December 31, 2018, Hyundai Green Power Co., Ltd., an associate of the Company, which engages in the byproduct gas power generating business, entered into a project financing agreement with a limit of W852.1 billion with Korea Development Bank and others. At a certain period in the future, the Company has call option against the financial investors (Korea Development Bank and others) and also has an obligation to purchase its shares when claimed by the financial investors. At a certain period in the future, the Company has put option against Hyundai Steel Company and a third party designated by Hyundai Steel Company (collectively, "Hyundai Steel Company"), the operating investor of Hyundai Green Power Co., Ltd., according to the conditions of the agreement and also has an obligation to sell its shares upon request from Hyundai Steel Company. As of December 31, 2017, Hyundai Green Power Co., Ltd., an associate of the Company, which engages in the byproduct gas power generating business, entered into a project financing agreement with a limit of KRW919.2 billion with Korea Development Bank and others. At a certain period in the future, the Company has an appraisal right against the financial investors (Korea Development Bank and others) and also has an obligation to sell its shares when claimed by the financial investors. At a certain period in the future, the Company has an appraisal right against Hyundai Steel Company and a third party designated by Hyundai Steel Company (collectively, "Hyundai Steel Company"), the operating investor of Hyundai Green Power Co., Ltd., according to the conditions of the agreement and also has an obligation to sell its shares when claimed by Hyundai Steel Company.
Korea Power Exchange    
Disclosure of associates [Line Items]    
Key operation activities [6] Management of power market and others Management of power market and others
Location [6] KOREA KOREA
Percentage of ownership [2],[6] 100.00% 100.00%
Acquisition cost [6] ₩ 127,839 ₩ 127,839
Book value    
Beginning balance 237,631 [6] 223,238
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 16,031 8,831
Other comprehensive income (loss) 0 0
Others (book value) (1,860) 5,562
Ending balance [6] 251,802 237,631
Share in net assets 251,802 237,631
Total assets 304,318 263,499
Total liabilities 52,516 25,868
Net assets 251,802 237,631
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) 0 0
Sales of Associates 108,571 105,107
Profit (loss) for the period of Associates ₩ 16,031 ₩ 8,831
AMEC Partners Korea Ltd.    
Disclosure of associates [Line Items]    
Key operation activities [7] Resources development Resources development
Location [7] KOREA KOREA
Percentage of ownership [2],[7] 19.00% 19.00%
Acquisition cost [7] ₩ 707 ₩ 707
Book value    
Beginning balance 215 [7] 225
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) (6) (10)
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance [7] 209 215
Share in net assets 209 215
Total assets 1,113 1,135
Total liabilities 14 4
Net assets 1,099 1,131
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) 0 0
Sales of Associates 0 1
Profit (loss) for the period of Associates ₩ (26) ₩ (53)
Hyundai Energy    
Disclosure of associates [Line Items]    
Key operation activities Power generation [8] Power generation [9]
Location KOREA [8] KOREA [9]
Percentage of ownership [2] 30.66% 30.66% [9]
Acquisition cost ₩ 71,070 [8] ₩ 71,070 [9]
Book value    
Beginning balance 0 [9] 1,031
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 0 (3,498)
Other comprehensive income (loss) 0 0
Others (book value) 0 2,467
Ending balance 0 [8] 0 [9]
Share in net assets (26,285) (16,921)
Total assets 470,818 474,939
Total liabilities 527,590 511,486
Net assets (56,772) (36,547)
Investment differential 0 0
Intercompany transaction (996) (1,037)
Others (consolidated FS) 27,281 17,958
Sales of Associates 101,998 92,992
Profit (loss) for the period of Associates ₩ (33,947) ₩ (43,317)
Shareholders' agreements that may cause future economic resource or cash outflows The Company had placed guarantees for a fixed return on the investment to NH Power II Co., Ltd. and National Agricultural Cooperative Federation ("NACF") and had obtained the rights to acquire the investment securities in return preferentially. In addition, NH Power II Co., Ltd. and NACF have a right, which can be exercised for 30 days starting from 2 months to 1 month prior to 17 years after the termination date of the contract to sell their shares to the Company. The Company had placed guarantees for a fixed return on the investment to NH Power II Co., Ltd. and National Agricultural Cooperative Federation ("NACF") and had obtained the rights to acquire the investment securities in return preferentially. In addition, NH Power II Co., Ltd. and NACF have a right, which can be exercised for 30 days starting from 2 months to 1 month prior to 17 years after the termination date of the contract to sell their shares to the Company.
Ecollite Co., Ltd.    
Disclosure of associates [Line Items]    
Key operation activities Artificial light-weight aggregate Artificial light-weight aggregate
Location KOREA KOREA
Percentage of ownership [2] 36.10% 36.10%
Acquisition cost ₩ 1,516 ₩ 1,516
Book value    
Beginning balance 0 0
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 0 0
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 0 0
Share in net assets 589 614
Total assets 1,944 2,052
Total liabilities 312 352
Net assets 1,632 1,700
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) (589) (614)
Sales of Associates 0 0
Profit (loss) for the period of Associates ₩ (68) ₩ (121)
Taebaek Wind Power Co., Ltd.    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership [2] 25.00% 25.00%
Acquisition cost ₩ 3,810 ₩ 3,810
Book value    
Beginning balance 5,319 4,750
Acquisition 0 0
Disposal 0 0
Dividends received (196) 0
Share of income (loss) 542 569
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 5,665 5,319
Share in net assets 5,665 5,319
Total assets 36,986 39,227
Total liabilities 14,325 17,953
Net assets 22,661 21,274
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) 0 0
Sales of Associates 8,233 7,056
Profit (loss) for the period of Associates ₩ 2,170 ₩ 2,312
Shareholders' agreements that may cause future economic resource or cash outflows In case non-controlling shareholders decide to dispose of their shares in Taebaek Wind Power Co., Ltd. after the warrant period of defect repair for wind power generator has expired, the Company acquires those shares at fair value. The acquisition is to be made after the conditions of the acquisition are discussed among the parties involved, with consideration of various factors such as financial status and business situation. In case non-controlling shareholders decide to dispose of their shares in Taebaek Wind Power Co., Ltd. after the warrant period of defect repair for wind power generator has expired, the Company acquires those shares at fair value. The acquisition is to be made after the conditions of the acquisition are discussed among the parties involved, with consideration of various factors such as financial status and business situation.
Significant restrictions on its abilities Financial institutions can reject or defer an approval with regard to the request for fund executions on subordinated loans of shareholders in order to pay senior loans based on the loan agreement. Financial institutions can reject or defer an approval with regard to the request for fund executions on subordinated loans of shareholders in order to pay senior loans based on the loan agreement.
Taeback Guinemi Wind Power Co., Ltd. (formerly, Muju Wind Power Co., Ltd.)    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership [2] 25.00% 25.00%
Acquisition cost ₩ 3,420 ₩ 3,420
Book value    
Beginning balance 3,089 3,131
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) (520) (42)
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 2,569 3,089
Share in net assets 2,569 3,089
Total assets 10,929 12,369
Total liabilities 653 12
Net assets 10,276 12,357
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) 0 0
Sales of Associates 0 0
Profit (loss) for the period of Associates ₩ (2,082) ₩ (140)
Pyeongchang Wind Power Co., Ltd.    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership [2] 25.00% 25.00%
Acquisition cost ₩ 3,875 ₩ 3,875
Book value    
Beginning balance 4,136 3,383
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 1,283 753
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 5,419 4,136
Share in net assets 5,419 4,136
Total assets 82,038 77,152
Total liabilities 60,362 60,606
Net assets 21,676 16,546
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) 0 0
Sales of Associates 12,615 11,907
Profit (loss) for the period of Associates ₩ 4,249 ₩ 3,038
Shareholders' agreements that may cause future economic resource or cash outflows In case non-controlling shareholders decide to dispose of their shares in Pyeongchang Wind Power Co., Ltd. after commercial operation of the power plant has started, the Company acquires those shares at fair value. The acquisition is to be made after the conditions of the acquisition are discussed among the parties involved, with the careful consideration of various factors such as financial status and business situation. In case non-controlling shareholders decide to dispose of their shares in Pyeongchang Wind Power Co., Ltd. after commercial operation of the power plant has started, the Company acquires those shares at fair value. The acquisition is to be made after the conditions of the acquisition are discussed among the parties involved, with the careful consideration of various factors such as financial status and business situation.
Significant restrictions on its abilities Principals on subordinated loans or dividends can only be paid when all conditions of the loan agreement are satisfied or prior written consent of financial institutions is obtained. Principals on subordinated loans or dividends can only be paid when all conditions of the loan agreement are satisfied or prior written consent of financial institutions is obtained.
Daeryun Power Co., Ltd.    
Disclosure of associates [Line Items]    
Key operation activities [7] Power generation Power generation [10]
Location [7] KOREA KOREA [10]
Percentage of ownership [2],[7] 9.34% 13.13% [10]
Acquisition cost [7] ₩ 40,854 ₩ 25,477 [10]
Book value    
Beginning balance 25,113 [7],[10] 29,873
Acquisition 0 [11] 0
Disposal 0 [11] 0
Dividends received 0 [11] 0
Share of income (loss) (189) [11] (4,762)
Other comprehensive income (loss) 184 [11] 0
Others (book value) 991 [11] 2
Ending balance [7] 26,099 [11] 25,113 [10]
Share in net assets 26,919 24,095
Total assets 798,569 779,258
Total liabilities 510,358 655,377
Net assets 288,211 123,881
Investment differential 0 1,014
Intercompany transaction 0 0
Others (consolidated FS) (820) 4
Sales of Associates 62,252 156,508
Profit (loss) for the period of Associates ₩ (4,958) ₩ (23,978)
Significant restrictions on its abilities Principals on subordinated loans or dividends can only be paid when all conditions of the loan agreement are satisfied or prior written consent of financial institutions is obtained. Principals on subordinated loans or dividends can only be paid when all conditions of the loan agreement are satisfied or prior written consent of financial institutions is obtained.
Changjuk Wind Power Co., Ltd.    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership [2] 30.00% 30.00%
Acquisition cost ₩ 3,801 ₩ 3,801
Book value    
Beginning balance 7,515 6,930
Acquisition 0 0
Disposal 0 0
Dividends received (416) (111)
Share of income (loss) 987 696
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 8,086 7,515
Share in net assets 8,086 7,515
Total assets 33,148 35,794
Total liabilities 6,194 10,745
Net assets 26,954 25,049
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) 0 0
Sales of Associates 7,929 6,981
Profit (loss) for the period of Associates ₩ 3,291 ₩ 2,317
Significant restrictions on its abilities Principals on subordinated loans or dividends can only be paid when all conditions of the loan agreement are satisfied or prior written consent of financial institutions is obtained. Principals on subordinated loans or dividends can only be paid when all conditions of the loan agreement are satisfied or prior written consent of financial institutions is obtained.
KNH Solar Co., Ltd.    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership [2] 27.00% 27.00%
Acquisition cost ₩ 1,296 ₩ 1,296
Book value    
Beginning balance 2,218 2,073
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 119 145
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 2,337 2,218
Share in net assets 2,337 2,218
Total assets 22,598 24,432
Total liabilities 13,942 16,215
Net assets 8,656 8,217
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) 0 0
Sales of Associates 3,586 3,947
Profit (loss) for the period of Associates ₩ 439 ₩ 628
Significant restrictions on its abilities Principal and interest, dividends to shareholders cannot be paid without written consent of financial institutions. Principal and interest, dividends to shareholders cannot be paid without written consent of financial institutions.
SPC Power Corporation    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location PHILIPPINES PHILIPPINES
Percentage of ownership [2] 38.00% 38.00%
Acquisition cost ₩ 20,635 ₩ 20,635
Book value    
Beginning balance 52,283 56,818
Acquisition 0 0
Disposal 0 0
Dividends received (9,549) (5,562)
Share of income (loss) 4,235 4,310
Other comprehensive income (loss) 10,578 (3,276)
Others (book value) 11 (7)
Ending balance 57,558 52,283
The fair value of associates 72,710 72,616
Share in net assets 79,336 52,283
Total assets 225,599 137,586
Total liabilities 16,819  
Net assets 208,780 137,586
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) (21,778) 0
Sales of Associates 50,317 68,149
Profit (loss) for the period of Associates ₩ 37,355 ₩ 37,395
Gemeng International Energy Co., Ltd.    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location CHINA CHINA
Percentage of ownership [2] 34.00% 34.00%
Acquisition cost ₩ 413,153 ₩ 413,153
Book value    
Beginning balance 649,973 680,065
Acquisition 0 0
Disposal 0 0
Dividends received (11,246) (13,365)
Share of income (loss) 15,156 6,953
Other comprehensive income (loss) (6,873) (23,680)
Others (book value) 0  
Ending balance 647,010 649,973
Share in net assets 930,028 649,973
Total assets 7,155,937 6,496,294
Total liabilities 4,420,561 4,584,608
Net assets 2,735,376 1,911,686
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) (283,018) 0
Sales of Associates 1,921,367 1,334,833
Profit (loss) for the period of Associates ₩ 120,558 ₩ 21,769
Shareholders' agreements that may cause future economic resource or cash outflows Gemeng International Energy Co., Ltd., issued put options on 8% of its shares to its financial investors, KEPCO Woori Sprott PEF (NPS Co-Pa PEF). If the investment fund is not collected until the maturity date (December 25, 2023, two years extension is possible), PEF can exercise the option at strike price which is the same as a principal investment price (including operating fees ratio of below 1% per annum), and also, the Company provided a performance guarantee on this agreement. Gemeng International Energy Co., Ltd., issued put options on 8% of its shares to its financial investors, KEPCO Woori Sprott PEF (NPS Co-Pa PEF). If the investment fund is not collected until the maturity date (December 25, 2023, two years extension is possible), PEF can exercise the option at strike price which is the same as a principal investment price (including operating fees ratio of below 1% per annum), and also, the Company provided a performance guarantee on this agreement.
PT. Cirebon Electric Power    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location INDONESIA INDONESIA
Percentage of ownership [2] 27.50% 27.50%
Acquisition cost ₩ 40,365 ₩ 40,365
Book value    
Beginning balance 97,410 96,658
Acquisition 0  
Disposal 0  
Dividends received (4,432) (550)
Share of income (loss) 9,385 10,685
Other comprehensive income (loss) 6,265 2,232
Others (book value) 0 (11,615)
Ending balance 108,628 97,410
Share in net assets 108,628 97,410
Total assets 876,069 903,429
Total liabilities 481,061 549,212
Net assets 395,008 354,217
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) 0 0
Sales of Associates 274,962 280,452
Profit (loss) for the period of Associates ₩ 33,144 ₩ 38,448
KNOC Nigerian East Oil    
Disclosure of associates [Line Items]    
Key operation activities [12] Resources development Resources development
Location [12] NIGERIA NIGERIA
Percentage of ownership [2],[12] 14.63% 14.63%
Acquisition cost [12] ₩ 12 ₩ 12
Book value    
Beginning balance 0 [12] 0
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 2,615 (1,914)
Other comprehensive income (loss) (471) 1,536
Others (book value) (2,144) 378
Ending balance [12] 0 0
Share in net assets (10,706) (12,850)
Total assets 78,841 241,808
Total liabilities 152,017 329,639
Net assets (73,176) (87,831)
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) 10,706 12,850
Sales of Associates 0 0
Profit (loss) for the period of Associates ₩ (398) ₩ (10,754)
KNOC Nigerian West Oil    
Disclosure of associates [Line Items]    
Key operation activities [12] Resources development Resources development
Location [12] NIGERIA NIGERIA
Percentage of ownership [2],[12] 14.63% 14.63%
Acquisition cost [12] ₩ 12 ₩ 12
Book value    
Beginning balance 0 [12] 0
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 2,342 (1,712)
Other comprehensive income (loss) (414) 1,407
Others (book value) (1,928) 305
Ending balance [12] 0 0
Share in net assets (9,835) (11,763)
Total assets 70,437 147,185
Total liabilities 137,663 227,588
Net assets (67,226) (80,403)
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) 9,835 11,763
Sales of Associates 0 0
Profit (loss) for the period of Associates ₩ (400) ₩ (9,768)
PT Wampu Electric Power    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location INDONESIA INDONESIA
Percentage of ownership [2] 46.00% 46.00%
Acquisition cost ₩ 21,292 ₩ 21,292
Book value    
Beginning balance 29,403 23,188
Acquisition 0  
Disposal 0  
Dividends received 0  
Share of income (loss) 408 9,336
Other comprehensive income (loss) 1,286  
Others (book value) 0 (3,121)
Ending balance 31,097 29,403
Share in net assets 31,097 29,403
Total assets 223,009 212,095
Total liabilities 155,406 148,177
Net assets 67,603 63,918
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) 0 0
Sales of Associates 13,463 779
Profit (loss) for the period of Associates ₩ 4,624 ₩ 8,114
PT. Bayan Resources TBK    
Disclosure of associates [Line Items]    
Key operation activities Resources development Resources development
Location INDONESIA INDONESIA
Percentage of ownership [2] 20.00% 20.00%
Acquisition cost ₩ 615,860 ₩ 615,860
Book value    
Beginning balance 451,831 402,667
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) (33,651) 34,122
Other comprehensive income (loss) 74,776 14,982
Others (book value) 18,690 60
Ending balance 511,646 451,831
The fair value of associates 1,017,601 558,267
Share in net assets 164,262 70,245
Total assets 1,388,199 908,106
Total liabilities 566,890 556,881
Net assets 821,309 351,225
Investment differential 423,763 482,109
Intercompany transaction 0 0
Others (consolidated FS) (76,379) (100,523)
Sales of Associates 1,707,387 811,515
Profit (loss) for the period of Associates ₩ 521,666 ₩ 243,621
S-Power Co., Ltd.    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership [2] 49.00% 49.00%
Acquisition cost ₩ 132,300 ₩ 132,300
Book value    
Beginning balance 116,945 123,912
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) (2,326) (6,982)
Other comprehensive income (loss) 0 0
Others (book value) (53) 15
Ending balance 114,566 116,945
Share in net assets 116,293 118,780
Total assets 825,354 859,633
Total liabilities 588,022 617,224
Net assets 237,332 242,409
Investment differential 0 0
Intercompany transaction (1,727) (1,835)
Others (consolidated FS) 0 0
Sales of Associates 551,378 489,042
Profit (loss) for the period of Associates ₩ (6,185) ₩ (14,470)
Pioneer Gas Power Limited    
Disclosure of associates [Line Items]    
Key operation activities [13] Power generation Power generation
Location [13] INDIA INDIA
Percentage of ownership [2],[13] 38.50% 38.50%
Acquisition cost [13] ₩ 49,831 ₩ 49,831
Book value    
Beginning balance 38,659 [13] 50,740
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) (17,684) (11,119)
Other comprehensive income (loss) (580) (1,238)
Others (book value) 0 276
Ending balance [13] 20,395 38,659
Share in net assets (1,951) 16,314
Total assets 311,742 339,271
Total liabilities 316,810 296,898
Net assets (5,068) 42,373
Investment differential 22,278 22,278
Intercompany transaction 0 0
Others (consolidated FS) 68 67
Sales of Associates 0 8,215
Profit (loss) for the period of Associates ₩ (45,934) ₩ (27,796)
Eurasia Energy Holdings    
Disclosure of associates [Line Items]    
Key operation activities Power generation and resources development Power generation and resources development
Location RUSSIA RUSSIA
Percentage of ownership [2] 40.00% 40.00%
Acquisition cost ₩ 461 ₩ 461
Book value    
Beginning balance 0 0
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 0 0
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 0 0
Share in net assets (179) (172)
Total assets 572 548
Total liabilities 1,020 978
Net assets (448) (430)
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) 179 172
Sales of Associates 0 0
Profit (loss) for the period of Associates 0 0
Unrecognized equity interest 7 (22)
Accumulated unrecognized equity interest ₩ 179 ₩ 172
Xe-Pian Xe-Namnoy Power    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location LAOS LAOS
Percentage of ownership [2] 25.00% 25.00%
Acquisition cost ₩ 84,374 ₩ 71,481
Book value    
Beginning balance 61,779 51,544
Acquisition 12,893 22,362
Disposal 0 0
Dividends received 0 0
Share of income (loss) (479) (4,264)
Other comprehensive income (loss) 2,972 (7,863)
Others (book value) 0  
Ending balance 77,165 61,779
Share in net assets 78,207 62,832
Total assets 1,015,013 858,789
Total liabilities 702,187 607,462
Net assets 312,826 251,327
Investment differential 253 74
Intercompany transaction (1,006) (838)
Others (consolidated FS) (289) (289)
Sales of Associates 0 0
Profit (loss) for the period of Associates ₩ (1,214) ₩ (16,677)
Hadong Mineral Fiber Co., Ltd.    
Disclosure of associates [Line Items]    
Key operation activities [7] Recycling fly ashes Recycling fly ashes
Location [7] KOREA KOREA
Percentage of ownership [2],[7] 8.33% 8.33%
Acquisition cost [7] ₩ 50 ₩ 50
Book value    
Beginning balance 0 [7] 0
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 0 0
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance [7] 0 0
Share in net assets (2) (2)
Total assets 203 203
Total liabilities 231 231
Net assets (28) (28)
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) 2 2
Sales of Associates 0 0
Profit (loss) for the period of Associates 0 (260)
Unrecognized equity interest 0 (3)
Accumulated unrecognized equity interest ₩ 2 ₩ 2
Green Biomass Co., Ltd.    
Disclosure of associates [Line Items]    
Key operation activities [14] Power generation Power generation [15]
Location [14] KOREA KOREA [15]
Percentage of ownership [2],[14] 8.80% 8.80% [15]
Acquisition cost [14] ₩ 714 ₩ 714 [15]
Book value    
Beginning balance 208 [14],[15] 47
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) (93) (112)
Other comprehensive income (loss) 0 0
Others (book value) 0 273
Ending balance [14] 115 208 [15]
Share in net assets 115 208
Total assets 4,411 6,379
Total liabilities 3,107 4,018
Net assets 1,304 2,361
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) 0 0
Sales of Associates 909 2,337
Profit (loss) for the period of Associates ₩ (1,057) ₩ (956)
PT. Mutiara Jawa    
Disclosure of associates [Line Items]    
Key operation activities Manufacturing and operating floating coal terminal Manufacturing and operating floating coal terminal
Location INDONESIA INDONESIA
Percentage of ownership [2] 29.00% 29.00%
Acquisition cost ₩ 2,978 ₩ 2,978
Book value    
Beginning balance 0 0
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 349 0
Other comprehensive income (loss) 16 0
Others (book value) 0 0
Ending balance 365 0
Share in net assets 365 (746)
Total assets 24,022 27,098
Total liabilities 22,763 29,670
Net assets 1,259 (2,572)
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) 0 746
Sales of Associates 14,393 13,574
Profit (loss) for the period of Associates 3,917 3,455
Unrecognized equity interest (746) (1,159)
Accumulated unrecognized equity interest ₩ 0 ₩ 746
Samcheok Eco Materials Co., Ltd.    
Disclosure of associates [Line Items]    
Key operation activities [16] Recycling fly ashes Recycling fly ashes
Location [16] KOREA KOREA
Percentage of ownership [2],[16] 2.35% 2.35%
Acquisition cost [16] ₩ 686 ₩ 686
Book value    
Beginning balance 0 [16] 0
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 0 0
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance [16] 0 0
Share in net assets 505 551
Total assets 24,391 23,729
Total liabilities 2,921 270
Net assets 21,470 23,459
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) (505) (551)
Sales of Associates 4,135 15
Profit (loss) for the period of Associates (1,836) (541)
Unrecognized equity interest 1,285 0
Accumulated unrecognized equity interest ₩ 1,285 ₩ 0
Shareholders' agreements that may cause future economic resource or cash outflows   The Company has the rights to purchase the stocks should preferred stockholders elect to sell their stocks on the expected sell date (3 years from preferred stock payment date) and is required to guarantee the promised yield when preferred stockholders sell their stocks.
Noeul Green Energy Co., Ltd.    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership [2] 29.00% 29.00%
Acquisition cost ₩ 1,740 ₩ 1,740
Book value    
Beginning balance 2,067 1,217
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 5,687 850
Other comprehensive income (loss) 0 0
Others (book value) 261 0
Ending balance 8,015 2,067
Share in net assets 8,015 2,067
Total assets 147,886 127,980
Total liabilities 120,249 120,852
Net assets 27,637 7,128
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) 0 0
Sales of Associates 58,686 43,099
Profit (loss) for the period of Associates ₩ 19,453 ₩ 2,932
Naepo Green Energy Co., Ltd.    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership [2] 41.67% 25.00%
Acquisition cost ₩ 29,200 ₩ 29,200
Book value    
Beginning balance 20,598 [17] 25,438
Acquisition 0 [18] 0 [17]
Disposal 0 [18] 0 [17]
Dividends received 0 [18] 0 [17]
Share of income (loss) (13,511) [18] (1,400) [17]
Other comprehensive income (loss) 0 [18] 0 [17]
Others (book value) (7,087) [18] (3,440) [17]
Ending balance 0 [18] 20,598 [17]
Share in net assets 7,085 20,598
Total assets 93,194 121,375
Total liabilities 76,190 71,945
Net assets 17,004 49,430
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) (7,085) 0
Sales of Associates 6,459 5,696
Profit (loss) for the period of Associates ₩ (6,623) ₩ (5,603)
Goseong Green Energy Co., Ltd.    
Disclosure of associates [Line Items]    
Key operation activities [5] Power generation Power generation
Location [5] KOREA KOREA
Percentage of ownership [2],[5] 1.12% 1.12%
Acquisition cost [5] ₩ 2,900 ₩ 2,900
Book value    
Beginning balance 2,597 [5] 2,663
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) (138) (66)
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance [5] 2,459 2,597
Share in net assets 2,590 2,676
Total assets 1,891,662 1,081,238
Total liabilities 1,659,415 841,330
Net assets 232,247 239,908
Investment differential 0 0
Intercompany transaction (131) (79)
Others (consolidated FS) 0 0
Sales of Associates 0 0
Profit (loss) for the period of Associates ₩ (7,323) ₩ (5,811)
Gangneung Eco Power Co., Ltd.    
Disclosure of associates [Line Items]    
Key operation activities [5] Power generation Power generation
Location [5] KOREA KOREA
Percentage of ownership [2],[5] 1.61% 1.61%
Acquisition cost [5] ₩ 2,900 ₩ 2,900
Book value    
Beginning balance 2,583 [5] 2,646
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) (88) (63)
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance [5] 2,495 2,583
Share in net assets 2,615 2,681
Total assets 813,938 186,765
Total liabilities 651,621 20,344
Net assets 162,317 166,421
Investment differential 0 0
Intercompany transaction (120) (98)
Others (consolidated FS) 0 0
Sales of Associates 0 0
Profit (loss) for the period of Associates ₩ (4,194) ₩ (3,407)
Shin Pyeongtaek Power Co., Ltd.    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership [2] 40.00% 40.00%
Acquisition cost ₩ 72,000 ₩ 43,920
Book value    
Beginning balance 34,903 0
Acquisition 28,080 43,880
Disposal 0 0
Dividends received 0 0
Share of income (loss) (2,946) (10,998)
Other comprehensive income (loss) 6,673 (3,617)
Others (book value) 890 5,638
Ending balance 67,600 34,903
Share in net assets 65,007 34,083
Total assets 674,100 175,870
Total liabilities 511,582 90,662
Net assets 162,518 85,208
Investment differential 12,800 7,808
Intercompany transaction (10,207) (6,988)
Others (consolidated FS) 0 0
Sales of Associates 0 0
Profit (loss) for the period of Associates 682 (4,585)
Unrecognized equity interest 0 (2,537)
Accumulated unrecognized equity interest ₩ 0 ₩ 0
Heang Bok Do Si Photovoltaic Power Co., Ltd.    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership [2] 28.00% 28.00%
Acquisition cost ₩ 194 ₩ 194
Book value    
Beginning balance 187 181
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 15 6
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 202 187
Share in net assets 200 185
Total assets 2,630 2,782
Total liabilities 1,915 2,120
Net assets 715 662
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) 2 2
Sales of Associates 455 451
Profit (loss) for the period of Associates 52 ₩ 22
DS POWER Co., Ltd.    
Disclosure of associates [Line Items]    
Key operation activities   Power generation
Location   KOREA
Book value    
Beginning balance ₩ 0 [19] ₩ 7,190
Acquisition [19]   0
Disposal [19]   0
Dividends received [19]   0
Share of income (loss) [19]   (1,321)
Other comprehensive income (loss) [19]   0
Others (book value) [19]   (5,869)
Ending balance [19]   ₩ 0
Dongducheon Dream Power Co., Ltd.    
Disclosure of associates [Line Items]    
Key operation activities Power generation [20] Power generation
Location KOREA [20] KOREA
Percentage of ownership [2] 33.61% [20] 33.61%
Acquisition cost ₩ 148,105 [20] ₩ 111,134
Book value    
Beginning balance 53,233 [21],[22] 46,876
Acquisition 36,971 0 [21],[22]
Disposal 0 0 [21],[22]
Dividends received 0 0 [21],[22]
Share of income (loss) (13,824) (10,980) [21],[22]
Other comprehensive income (loss) 0  
Others (book value) 6 17,337 [21],[22]
Ending balance 76,386 [20] 53,233 [21],[22]
Share in net assets 91,260 70,356
Total assets 1,512,510 1,575,175
Total liabilities 1,244,178 1,365,845
Net assets 268,332 209,330
Investment differential 1,757 0
Intercompany transaction (4,049) (4,409)
Others (consolidated FS) (12,582) (12,714)
Sales of Associates 828,430 813,440
Profit (loss) for the period of Associates (22,864) ₩ (33,740)
KS Solar Co., Ltd.    
Disclosure of associates [Line Items]    
Key operation activities   Power generation
Location   KOREA
Book value    
Beginning balance ₩ 0 ₩ 604
Acquisition   0
Disposal   (613)
Dividends received   0
Share of income (loss)   0
Other comprehensive income (loss)   9
Others (book value)   0
Ending balance   ₩ 0
Jinbhuvish Power Generation Pvt. Ltd.    
Disclosure of associates [Line Items]    
Key operation activities [5] Power generation Power generation
Location [5] INDIA INDIA
Percentage of ownership [2],[5] 5.16% 5.16%
Acquisition cost [5] ₩ 9,000 ₩ 9,000
Book value    
Beginning balance 0 [5] 0
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 0 0
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance [5] 0 0
Share in net assets 2,586 2,704
Total assets 63,163 66,047
Total liabilities 13,044 13,640
Net assets 50,119 52,407
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) (2,586) (2,704)
Sales of Associates 0 0
Profit (loss) for the period of Associates ₩ 0 ₩ 0
SE Green Energy Co., Ltd.    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership [2] 47.76% 47.76%
Acquisition cost ₩ 3,821 ₩ 3,821
Book value    
Beginning balance 3,476 3,525
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) (110) (49)
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 3,366 3,476
Share in net assets 3,366 3,476
Total assets 7,048 7,278
Total liabilities 0  
Net assets 7,048 7,278
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) 0 0
Sales of Associates 0 0
Profit (loss) for the period of Associates ₩ (230) ₩ (103)
Daegu Photovoltaic Co., Ltd.    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership [2] 29.00% 29.00%
Acquisition cost ₩ 1,230 ₩ 1,230
Book value    
Beginning balance 1,718 1,700
Acquisition 0 0
Disposal 0 0
Dividends received (128) (349)
Share of income (loss) 412 367
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 2,002 1,718
Share in net assets 2,002 1,718
Total assets 16,828 17,262
Total liabilities 9,923 11,339
Net assets 6,905 5,923
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) 0 0
Sales of Associates 3,695 3,714
Profit (loss) for the period of Associates ₩ 1,645 ₩ 1,263
Jeongam Wind Power Co., Ltd.    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership [2] 40.00% 40.00%
Acquisition cost ₩ 5,580 ₩ 5,580
Book value    
Beginning balance 3,763 4,000
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 826 (237)
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 4,589 3,763
Share in net assets 4,589 3,763
Total assets 93,444 67,427
Total liabilities 81,971 58,019
Net assets 11,473 9,408
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) 0 0
Sales of Associates 1,559 0
Profit (loss) for the period of Associates ₩ 2,154 ₩ (580)
Shareholders' agreements that may cause future economic resource or cash outflows In case non-controlling shareholders decide to dispose of their shares in Jeongam Wind Power Co., Ltd. after the construction of the power plant has been completed, the Company is obligated to acquire those shares at fair value In case non-controlling shareholders decide to dispose of their shares in Jeongam Wind Power Co., Ltd. after the construction of the power plant has been completed, the Company is obligated to acquire those shares at fair value.
Korea Power Engineering Service Co., Ltd.    
Disclosure of associates [Line Items]    
Key operation activities Construction and service Construction and service
Location KOREA KOREA
Percentage of ownership [2] 29.00% 29.00%
Acquisition cost ₩ 290 ₩ 290
Book value    
Beginning balance 3,659 2,810
Acquisition 0 0
Disposal 0 0
Dividends received (218) (191)
Share of income (loss) 929 1,030
Other comprehensive income (loss) 0 0
Others (book value) (37) 10
Ending balance 4,333 3,659
Share in net assets 4,333 3,659
Total assets 18,609 15,738
Total liabilities 3,666 3,121
Net assets 14,943 12,617
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) 0 0
Sales of Associates 20,809 22,283
Profit (loss) for the period of Associates ₩ 3,207 ₩ 3,783
Busan Green Energy Co., Ltd.    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership [2] 29.00% 29.00%
Acquisition cost ₩ 5,243 ₩ 5,243
Book value    
Beginning balance 7,363 13,803
Acquisition 0 0
Disposal 0 (9,320)
Dividends received 0 0
Share of income (loss) 5,037 2,884
Other comprehensive income (loss) 0  
Others (book value) 137 (4)
Ending balance 12,537 7,363
Share in net assets 12,537 7,363
Total assets 195,227 193,253
Total liabilities 151,995 167,864
Net assets 43,232 25,389
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) 0 0
Sales of Associates 77,011 34,280
Profit (loss) for the period of Associates ₩ 17,370 ₩ 9,946
Gunsan Bio Energy Co., Ltd.    
Disclosure of associates [Line Items]    
Key operation activities [5] Power generation Power generation
Location [5] KOREA KOREA
Percentage of ownership [2],[5] 18.87% 18.87%
Acquisition cost [5] ₩ 1,000 ₩ 1,000
Book value    
Beginning balance 0 [5] 0
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 0 0
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance [5] 0 0
Share in net assets (2,202) (1,286)
Total assets 8,990 9,648
Total liabilities 20,660 16,462
Net assets (11,670) (6,814)
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) 2,202 1,286
Sales of Associates 0 0
Profit (loss) for the period of Associates (4,420) (6,109)
Unrecognized equity interest 916 1,154
Accumulated unrecognized equity interest ₩ 2,202 ₩ 1,286
Korea Electric Vehicle Charging Service    
Disclosure of associates [Line Items]    
Key operation activities Electric vehicle charge service Electric vehicle charge service
Location KOREA KOREA
Percentage of ownership [2] 28.00% 28.00%
Acquisition cost ₩ 2,800 ₩ 2,604
Book value    
Beginning balance 1,749 1,103
Acquisition 196 1,008
Disposal 0 0
Dividends received 0 0
Share of income (loss) (352) (362)
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 1,593 1,749
Share in net assets 1,593 1,749
Total assets 15,019 14,650
Total liabilities 9,328 8,404
Net assets 5,691 6,246
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) 0 0
Sales of Associates 8,615 8,399
Profit (loss) for the period of Associates ₩ (1,056) ₩ (1,295)
Ulleungdo Natural Energy Co., Ltd.    
Disclosure of associates [Line Items]    
Key operation activities Renewable power generation Renewable power generation
Location KOREA KOREA
Percentage of ownership [2] 29.85% 29.85%
Acquisition cost ₩ 8,000 ₩ 8,000
Book value    
Beginning balance 6,370 6,894
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) (1,749) (524)
Other comprehensive income (loss) 0 0
Others (book value) 7 0
Ending balance 4,628 6,370
Share in net assets 4,629 6,370
Total assets 17,134 25,842
Total liabilities 1,625 4,501
Net assets 15,509 21,341
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) (1) 0
Sales of Associates 0 0
Profit (loss) for the period of Associates ₩ (5,855) ₩ (1,758)
Korea Nuclear Partners Co., Ltd.    
Disclosure of associates [Line Items]    
Key operation activities Electric material agency Electric material agency
Location KOREA KOREA
Percentage of ownership [2] 29.00% 29.00%
Acquisition cost ₩ 290 ₩ 290
Book value    
Beginning balance 383 248
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) (208) 135
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 175 383
Share in net assets 175 383
Total assets 615 2,033
Total liabilities 12 711
Net assets 603 1,322
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) 0 0
Sales of Associates 80 1,345
Profit (loss) for the period of Associates ₩ (707) ₩ 465
Tamra Offshore Wind Power Co., Ltd.    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership [2] 27.00% 27.00%
Acquisition cost ₩ 8,910 ₩ 8,910
Book value    
Beginning balance 8,560 7,015
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 1,841 1,545
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 10,401 8,560
Share in net assets 10,401 8,560
Total assets 170,238 163,740
Total liabilities 131,717 132,036
Net assets 38,521 31,704
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) 0 0
Sales of Associates 21,701 4,392
Profit (loss) for the period of Associates ₩ 4,077 ₩ (191)
Korea Electric Power Corporation Fund    
Disclosure of associates [Line Items]    
Key operation activities [23] Developing electric enterprises Developing electric enterprises
Location [23] KOREA KOREA
Percentage of ownership [2],[23] 98.09% 98.09%
Acquisition cost [23] ₩ 51,500 ₩ 51,500
Book value    
Beginning balance 47,974 [23] 50,856
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) (505) (2,171)
Other comprehensive income (loss) (280) (711)
Others (book value) 0 0
Ending balance [23] 47,189 47,974
Share in net assets 47,185 47,971
Total assets 48,280 49,170
Total liabilities 176 265
Net assets 48,104 48,905
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) 4 3
Sales of Associates 1,315 666
Profit (loss) for the period of Associates ₩ (649) ₩ (2,213)
Energy Infra Asset Management Co., Ltd.    
Disclosure of associates [Line Items]    
Key operation activities [7] Asset management Asset management
Location [7] KOREA KOREA
Percentage of ownership [2],[7] 9.90% 9.90%
Acquisition cost [7] ₩ 297 ₩ 297
Book value    
Beginning balance 476 [7] 259
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 189 217
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance [7] 665 476
Share in net assets 665 476
Total assets 7,225 5,240
Total liabilities 507 431
Net assets 6,718 4,809
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) 0 0
Sales of Associates 5,757 5,807
Profit (loss) for the period of Associates ₩ 2,193 ₩ 2,203
Daegu clean Energy Co., Ltd.    
Disclosure of associates [Line Items]    
Key operation activities Renewable power generation Renewable power generation
Location KOREA KOREA
Percentage of ownership [2] 28.00% 28.00%
Acquisition cost ₩ 140 ₩ 140
Book value    
Beginning balance 11 140
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 6 (129)
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 17 11
Share in net assets 17 11
Total assets 389 252
Total liabilities 328 212
Net assets 61 40
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) 0 0
Sales of Associates 0 0
Profit (loss) for the period of Associates ₩ (190) ₩ (460)
YaksuESS Co., Ltd    
Disclosure of associates [Line Items]    
Key operation activities Installing ESS related equipment Installing ESS related equipment
Location KOREA KOREA
Percentage of ownership [2] 29.00% 29.00%
Acquisition cost ₩ 210 ₩ 210
Book value    
Beginning balance 194 196
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 266 (2)
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 460 194
Share in net assets 458 193
Total assets 7,525 7,105
Total liabilities 5,944 6,437
Net assets 1,581 668
Investment differential 0 0
Intercompany transaction 0 0
Others (consolidated FS) 2 1
Sales of Associates 2,094 381
Profit (loss) for the period of Associates ₩ 1,259 ₩ (6)
Nepal Water & Energy Development Company Private Limited    
Disclosure of associates [Line Items]    
Key operation activities [24] Construction and operation of utility plant Construction and operation of utility plant
Location [24] NEPAL NEPAL
Percentage of ownership [2],[24] 57.67% 62.13%
Acquisition cost [24] ₩ 33,577 ₩ 33,577
Book value    
Beginning balance 30,498 [24] 18,667
Acquisition 0 15,009
Disposal 0 0
Dividends received 0 0
Share of income (loss) (770) (677)
Other comprehensive income (loss) 1,233 (2,501)
Others (book value) 0 0
Ending balance [24] 30,961 30,498
Share in net assets 29,529 28,860
Total assets 55,453 58,121
Total liabilities 4,249 11,670
Net assets 51,204 46,451
Investment differential 972 972
Intercompany transaction 0 0
Others (consolidated FS) 460 666
Sales of Associates 0 0
Profit (loss) for the period of Associates ₩ (984) ₩ (968)
Gwangyang Green Energy Co., Ltd    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership [2] 20.00% 20.00%
Acquisition cost ₩ 2,000 ₩ 2,000
Book value    
Beginning balance 1,772 0
Acquisition 0 2,000
Disposal 0 0
Dividends received 0 0
Share of income (loss) (566) (228)
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 1,206 1,772
Share in net assets 1,188 1,754
Total assets 29,234 20,165
Total liabilities 23,293 11,393
Net assets 5,941 8,772
Investment differential 18 18
Intercompany transaction 0 0
Others (consolidated FS) 0 0
Sales of Associates 0 0
Profit (loss) for the period of Associates ₩ (2,831) ₩ 0
PND solar., Ltd    
Disclosure of associates [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership [2] 29.00% 29.00%
Acquisition cost ₩ 1,250 ₩ 1,250
Book value    
Beginning balance 1,250 0
Acquisition 0 1,250
Disposal 0 0
Dividends received 0 0
Share of income (loss) (230) 0
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 1,020 1,250
Share in net assets 866 1,096
Total assets 42,283 10,508
Total liabilities 39,297 6,729
Net assets 2,986 3,779
Investment differential 154 154
Intercompany transaction 0 0
Others (consolidated FS) 0 0
Sales of Associates 1,094 0
Profit (loss) for the period of Associates ₩ (795) ₩ 0
Hyundai Eco Energy Co., Ltd.    
Disclosure of associates [Line Items]    
Key operation activities [5] Power generation  
Location [5] KOREA  
Percentage of ownership [2],[5] 19.00%  
Acquisition cost [5] ₩ 3,610  
Book value    
Acquisition 3,610  
Disposal 0  
Dividends received 0  
Share of income (loss) (222)  
Other comprehensive income (loss) 0  
Others (book value) 0  
Ending balance [5] 3,388  
Share in net assets 3,174  
Total assets 165,555  
Total liabilities 148,852  
Net assets 16,703  
Investment differential 214  
Intercompany transaction 0  
Others (consolidated FS) 0  
Sales of Associates 0  
Profit (loss) for the period of Associates (2,193)  
Unrecognized equity interest 25,841  
Accumulated unrecognized equity interest ₩ 25,841  
YeongGwang Yaksu Wind Electric. Co., Ltd    
Disclosure of associates [Line Items]    
Key operation activities [5] Power generation  
Location [5] KOREA  
Percentage of ownership [2],[5] 9.63%  
Acquisition cost [5] ₩ 533  
Book value    
Acquisition 533  
Disposal 0  
Dividends received 0  
Share of income (loss) 0  
Other comprehensive income (loss) 0  
Others (book value) 0  
Ending balance [5] 533  
Share in net assets 233  
Total assets 46,027  
Total liabilities 43,606  
Net assets 2,421  
Investment differential 300  
Intercompany transaction 0  
Others (consolidated FS) 0  
Sales of Associates 7,604  
Profit (loss) for the period of Associates ₩ (493)  
Shareholders' agreements that may cause future economic resource or cash outflows As of December 31, 2018, YeongGwang Yaksu Wind Electric. Co., Ltd, an associate of the Company, which engages in the wind power generating business, entered into a project financing agreement with a limit of W46.8 billion with Hanwha Life Insurance Co., Ltd. and others.  
[1] The effective percentage of ownership is 21.57% considering treasury stocks.
[2] The percentage of ownership shown above is after considering the treasury stocks and others.
[3] The carrying amount of Korea Gas Corporation ("KOGAS") is KRW1,701,848 million as of December 31, 2018 and management has determined that there is objective evidence of impairment. As a result of the impairment test, the Company has not recognized any impairment loss as the value in use is greater than the carrying amount. The recoverable amount of KOGAS based on its value in use is calculated by considering the long-term natural gas supply and demand programs of future cash flows approved by Ministry of Trade, Industry & Energy and the discount rate of 4.80%.
[4] The profit for the year ended December 31, 2018 is net of net income attributable to non-controlling interests.
[5] The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint directors to the board of directors of the entity, and by strict decision criteria of the Company's financial and operating policy of the board of directors.
[6] The effective percentage of ownership is 100%. However, the Government regulates the Company's ability to make operating and financial decisions over the entity, as the Government requires maintaining arms-length transactions between KPX and the Company's other subsidiaries. The Company can exercise significant influence by its right to nominate directors to the board of directors of the entity.
[7] The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint a director to the board of directors of the entity.
[8] As of December 31, 2018, 15.64% of ownership of Hyundai Energy Co., Ltd. is held by NH Power ll Co., Ltd. and NH Bank. According to the shareholders' agreement reached on March 2011, not only does the Company have a call option to acquire the investment in Hyundai Energy Co., Ltd. from NH Power ll Co., Ltd. and NH Bank with a certain rate of return, NH Power ll Co., Ltd. and NH Bank also have put options to dispose of their investment to the Company. In connection with this agreement, the Company applied the equity method on the investment in Hyundai Energy Co., Ltd. with 46.30% of ownership.
[9] As of December 31, 2017, 15.64% of ownership of Hyundai Energy Co., Ltd. is held by NH Power ll Co., Ltd. and NH Bank. According to the shareholders' agreement reached on March 2011, not only does the Company have a call option to acquire the investment in Hyundai Energy Co., Ltd. from NH Power ll Co., Ltd. and NH Bank with a certain rate of return, NH Power ll Co., Ltd. and NH Bank also have put options to dispose of their investment to the Company. In connection with this agreement, the Company applied the equity method on the investment in Hyundai Energy Co., Ltd. with 46.30% of ownership.
[10] The effective percentage of ownership is 19.45% considering stock purchase options.
[11] It was determined that there is objective evidence of impairment due to prolonged operating losses. As a result, the Company recognized an impairment loss of KRW820 million in impairment loss on investments in associates and joint ventures for the year ended December 31, 2018.
[12] The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint one out of four members of the steering committee of the entity. Moreover, the Company has significant financial transactions, which can affect its influence on the entity.
[13] As of reporting date, the annual reporting period of all associates and joint ventures ends on December 31, except for Pioneer Gas Power Limited whose reporting period ends on March 31.
[14] The effective percentage of ownership is less than 20% but the Company can exercise significant influence by virtue of its contractual right to appoint a director to the board of directors of the entity and the fact that the dominant portion of the investee's sales transactions is generated from the Company.
[15] The percentage of ownership decreased since the Company did not participate in the capital increase of Green Biomass Co., Ltd. during the period.
[16] The Company's effective percentage of ownership excluding the redeemable convertible preferred stock is 25.54%.
[17] It was determined that there is objective evidence of impairment due to prolonged operating losses. As a result, the Company recognized an impairment loss of KRW3,440 million in impairment loss on investments in associates and joint ventures for the year ended December 31, 2017.
[18] It was determined that there is objective evidence of impairment due to prolonged operating losses. As a result, the Company recognized an impairment loss of KRW7,087 million in impairment loss on investments in associates and joint ventures for the year ended December 31, 2018.
[19] 'Others' include KRW4,438 million of assets held-for-sale (note 45), and also include KRW1,439 million of available-for-sale financial assets which is reclassified due to loss of significant influence.
[20] The effective percentage of ownership is 34.01% considering redeemable convertible preferred stock.
[21] 'Others' include KRW41,170 million of assets held-for-sale (note 45).
[22] It was determined that there is objective evidence of impairment due to prolonged operating losses. As a result, the Company recognized an impairment loss of KRW23,798 million in impairment loss on investments in associates and joint ventures for the year ended December 31, 2017.
[23] The effective percentage of ownership is more than 50% but the Company does not hold control over relevant business while it exercises significant influence by participating in the Investment Decision Committee. For this reason, the entity is classified as an associate.
[24] The effective percentage of ownership is more than 50% but the Company does not hold control over the entity according to the shareholders' agreement. For this reason, the entity is classified as an associate.