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Investments in Joint Ventures (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
KEPCO-Uhde Inc. [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities [1] Power generation Power generation
Location [1] KOREA KOREA
Percentage of ownership [1] 52.80% 52.80%
Acquisition cost [1] ₩ 11,355 ₩ 11,355
Book value [Abstract]    
Beginning balance 301 [1] 8,549
Share of income (loss) (43) (159)
Others (book value)   (8,089)
Ending balance [1] 258 301
Share in net assets 258 301
Total assets 515 624
Total liabilities 7 33
Net assets 508 591
Profit (loss) for the period of JointVentures ₩ (86) ₩ (16,855)
Eco Biomass Energy Sdn. Bhd. [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities [1] Power generation Power generation
Location [1] MALAYSIA MALAYSIA
Percentage of ownership [1] 61.53% 61.53%
Acquisition cost [1] ₩ 14,439 ₩ 9,661
Datang Chaoyang Renewable Power Co., Ltd. [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities Power generation Power generation
Location CHINA CHINA
Percentage of ownership 40.00% 40.00%
Acquisition cost ₩ 27,660 ₩ 27,660
Book value [Abstract]    
Beginning balance 28,239 27,640
Dividends received (839)  
Share of income (loss) 840 1,417
Other comprehensive income (loss) (978) (818)
Ending balance 27,262 28,239
Share in net assets 27,262 28,239
Total assets 138,463 142,684
Total liabilities 70,309 72,086
Net assets 68,154 70,598
Sales of JointVentures 17,776 18,628
Profit (loss) for the period of JointVentures ₩ 2,149 ₩ 3,462
Shuweihat Asia Power Investment B.V. [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities Holding company Holding company [1]
Location NETHERLANDS NETHERLANDS [1]
Percentage of ownership 49.00% 49.00% [1]
Acquisition cost ₩ 46,037 ₩ 46,037 [1]
Book value [Abstract]    
Beginning balance   20,474
Disposal   (14,154)
Dividends received (1,707) (2,957)
Share of income (loss) 4,275 6,131
Other comprehensive income (loss) 12,457 (9,494)
Others (book value) 650  
Ending balance 15,675  
Share in net assets 15,675 136
Total assets 32,001 282
Total liabilities 10 4
Net assets 31,991 278
Others (consolidated FS)   (136)
Profit (loss) for the period of JointVentures ₩ (170) ₩ 12,380
Shuweihat Asia Operation & Maintenance Company [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities Maintenance of utility plant [1] Maintenance of utility plant
Location CAYMAN [1] CAYMAN
Percentage of ownership 55.00% [1] 55.00%
Acquisition cost ₩ 30 [1] ₩ 30
Book value [Abstract]    
Beginning balance 450 486
Dividends received (770) (931)
Share of income (loss) 1,055 941
Other comprehensive income (loss) (172) (46)
Others (book value) 100  
Ending balance 663 [1] 450
Share in net assets 663 552
Total assets 1,220 1,016
Total liabilities 14 13
Net assets 1,206 1,003
Others (consolidated FS)   (102)
Sales of JointVentures 2,580 2,388
Profit (loss) for the period of JointVentures ₩ 1,918 ₩ 1,723
Waterbury Lake Uranium L.P. [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities Resources development Resources development
Location CANADA CANADA
Percentage of ownership 35.76% 36.97%
Acquisition cost ₩ 26,602 ₩ 26,602
Book value [Abstract]    
Beginning balance 21,314 20,299
Share of income (loss) (23)  
Other comprehensive income (loss) (949) 1,138
Others (book value) (561) (123)
Ending balance 19,781 21,314
Share in net assets 19,780 20,753
Total assets 55,563 56,181
Total liabilities 250 47
Net assets 55,313 56,134
Others (consolidated FS) ₩ 1 ₩ 561
ASM-BG Investicii AD [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities Power generation Power generation
Location BULGARIA BULGARIA
Percentage of ownership 50.00% 50.00%
Acquisition cost ₩ 16,101 ₩ 16,101
Book value [Abstract]    
Beginning balance 21,488 20,203
Dividends received (946)  
Share of income (loss) (150) 1,508
Other comprehensive income (loss) 810 (223)
Ending balance 21,202 21,488
Share in net assets 21,202 21,489
Total assets 87,110 79,898
Total liabilities 44,706 36,921
Net assets 42,404 42,977
Others (consolidated FS)   (1)
Sales of JointVentures 12,611 12,604
Profit (loss) for the period of JointVentures ₩ (262) ₩ 3,105
RES Technology AD [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities Power generation Power generation
Location BULGARIA BULGARIA
Percentage of ownership 50.00% 50.00%
Acquisition cost ₩ 15,595 ₩ 15,595
Book value [Abstract]    
Beginning balance 13,582 13,789
Share of income (loss) 1,053 (68)
Other comprehensive income (loss) (260) (139)
Ending balance 14,375 13,582
Share in net assets 14,375 13,582
Total assets 71,595 68,553
Total liabilities 42,845 41,389
Net assets 28,750 27,164
Sales of JointVentures 7,793 7,798
Profit (loss) for the period of JointVentures ₩ 2,164 ₩ (139)
KV Holdings, Inc. [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities Power generation Power generation
Location PHILIPPINES PHILIPPINES
Percentage of ownership 40.00% 40.00%
Acquisition cost ₩ 2,103 ₩ 2,103
Book value [Abstract]    
Beginning balance 2,098 2,010
Dividends received   (302)
Share of income (loss) 61 429
Other comprehensive income (loss) (241) (39)
Ending balance 1,918 2,098
Share in net assets 1,918 2,098
Total assets 4,795 5,245
Total liabilities   1
Net assets 4,795 5,244
Sales of JointVentures 671  
Profit (loss) for the period of JointVentures ₩ 677 ₩ 1,072
KEPCO SPC Power Corporation [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities [1] Construction and operation of utility plant Construction and operation of utility plant
Location [1] PHILIPPINES PHILIPPINES
Percentage of ownership [1] 75.20% 75.20%
Acquisition cost [1] ₩ 94,579 ₩ 94,579
Book value [Abstract]    
Beginning balance 245,367 [1] 208,524
Dividends received (37,443) (5,955)
Share of income (loss) 42,359 48,132
Other comprehensive income (loss) (33,230) (5,308)
Others (book value) 41 (26)
Ending balance [1] 217,094 245,367
Share in net assets 217,094 245,367
Total assets 318,911 448,069
Total liabilities 30,222 121,783
Net assets 288,689 326,286
Sales of JointVentures 186,725 165,046
Profit (loss) for the period of JointVentures ₩ 57,364 ₩ 63,689
Canada Korea Uranium Limited Partnership [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities [2]   Resources development
Location [2]   CANADA
Percentage of ownership [2]   12.50%
Acquisition cost [2]   ₩ 5,404
Book value [Abstract]    
Share in net assets   18
Total assets   285
Total liabilities   144
Net assets   141
Others (consolidated FS)   (18)
Profit (loss) for the period of JointVentures   ₩ (59)
Gansu Datang Yumen Wind Power Co., Ltd. [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities Power generation Power generation
Location CHINA CHINA
Percentage of ownership 40.00% 40.00%
Acquisition cost ₩ 16,621 ₩ 16,621
Book value [Abstract]    
Beginning balance 12,821 16,107
Share of income (loss) (1,299) (2,836)
Other comprehensive income (loss) (682) (450)
Ending balance 10,840 12,821
Share in net assets 10,840 12,821
Total assets 81,960 89,517
Total liabilities 54,859 57,464
Net assets 27,101 32,053
Sales of JointVentures 6,938 4,263
Profit (loss) for the period of JointVentures ₩ (3,253) ₩ (6,815)
Datang Chifeng Renewable Power [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities Power generation Power generation
Location CHINA CHINA
Percentage of ownership 40.00% 40.00%
Acquisition cost ₩ 121,928 ₩ 121,928
Book value [Abstract]    
Beginning balance 166,535 171,224
Dividends received   (7,384)
Share of income (loss) 14,079 7,455
Other comprehensive income (loss) (9,559) (4,760)
Ending balance 171,055 166,535
Share in net assets 171,105 166,584
Total assets 762,605 813,804
Total liabilities 334,843 397,344
Net assets 427,762 416,460
Others (consolidated FS) (50) (49)
Sales of JointVentures 113,329 99,795
Profit (loss) for the period of JointVentures ₩ 35,294 ₩ 19,042
Datang KEPCO Chaoyang Renewable Power Co., Ltd. [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities Power generation Power generation
Location CHINA CHINA
Percentage of ownership 40.00% 40.00%
Acquisition cost ₩ 10,858 ₩ 10,858
Book value [Abstract]    
Beginning balance 10,843 10,580
Dividends received   (440)
Share of income (loss) 837 1,002
Other comprehensive income (loss) (620) (299)
Ending balance 11,060 10,843
Share in net assets 11,060 10,843
Total assets 60,913 62,600
Total liabilities 33,264 35,493
Net assets 27,649 27,107
Sales of JointVentures 8,442 8,742
Profit (loss) for the period of JointVentures ₩ 2,094 ₩ 2,505
Rabigh Electricity Company [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities Power generation Power generation
Location SAUDI ARABIA SAUDI ARABIA
Percentage of ownership 40.00% 40.00%
Acquisition cost ₩ 109,743 ₩ 109,743
Book value [Abstract]    
Beginning balance 97,802 59,368
Dividends received (18,112)  
Share of income (loss) 35,769 18,961
Other comprehensive income (loss) (15,227) 19,473
Others (book value) (876)  
Ending balance 99,356 97,802
Share in net assets 171,248 173,153
Total assets 2,364,522 2,691,654
Total liabilities 1,936,403 2,258,772
Net assets 428,119 432,882
Intercompany transaction (70,978) (75,311)
Others (consolidated FS) (914) (40)
Sales of JointVentures 287,105 278,431
Profit (loss) for the period of JointVentures ₩ 78,948 ₩ 37,791
Rabigh Operation & Maintenance Company [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities Maintenance of utility plant Maintenance of utility plant
Location SAUDI ARABIA SAUDI ARABIA
Percentage of ownership 40.00% 40.00%
Acquisition cost ₩ 70 ₩ 70
Book value [Abstract]    
Beginning balance 4,427 3,586
Dividends received (2,130) (1,934)
Share of income (loss) 2,236 2,253
Other comprehensive income (loss) (546) 229
Others (book value)   293
Ending balance 3,987 4,427
Share in net assets 3,987 4,427
Total assets 19,992 25,032
Total liabilities 10,025 13,965
Net assets 9,967 11,067
Sales of JointVentures 22,668 25,607
Profit (loss) for the period of JointVentures ₩ 5,668 ₩ 4,870
Jamaica Public Service Company Limited [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities Power generation Power generation
Location JAMAICA JAMAICA
Percentage of ownership 40.00% 40.00%
Acquisition cost ₩ 301,910 ₩ 301,910
Book value [Abstract]    
Beginning balance 249,453 241,918
Other comprehensive income (loss) (28,300) 7,535
Ending balance 221,153 249,453
Share in net assets 209,464 252,685
Total assets 1,276,279 1,291,008
Total liabilities 752,617 659,296
Net assets 523,662 631,712
Investment differential (80,161) (80,161)
Others (consolidated FS) 91,850 76,929
Sales of JointVentures 946,365 827,298
Profit (loss) for the period of JointVentures ₩ 24,601 ₩ 25,324
KW Nuclear Components Co., Ltd. [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities Manufacturing Manufacturing
Location KOREA KOREA
Percentage of ownership 45.00% 45.00%
Acquisition cost ₩ 833 ₩ 833
Book value [Abstract]    
Beginning balance 7,133 4,985
Dividends received (208) (2,191)
Share of income (loss) (222) 4,344
Others (book value)   (5)
Ending balance 6,703 7,133
Share in net assets 6,962 6,492
Total assets 25,693 26,417
Total liabilities 10,221 11,990
Net assets 15,472 14,427
Investment differential   90
Others (consolidated FS) (259) 551
Sales of JointVentures 6,486 26,481
Profit (loss) for the period of JointVentures ₩ 1,493 ₩ 9,452
Busan Shinho Solar Power Co., Ltd. [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership 25.00% 25.00%
Acquisition cost ₩ 2,100 ₩ 2,100
Book value [Abstract]    
Beginning balance 3,814 3,678
Dividends received (63) (185)
Share of income (loss) 595 321
Ending balance 4,346 3,814
Share in net assets 4,346 3,814
Total assets 47,959 47,789
Total liabilities 30,573 32,533
Net assets 17,386 15,256
Sales of JointVentures 7,984 6,770
Profit (loss) for the period of JointVentures ₩ 2,383 ₩ 1,247
GS Donghae Electric Power Co., Ltd. [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership 34.00% 34.00%
Acquisition cost ₩ 204,000 ₩ 204,000
Book value [Abstract]    
Beginning balance 205,948 200,379
Share of income (loss) 14,714 5,575
Others (book value) 65 (6)
Ending balance 220,727 205,948
Share in net assets 220,727 205,948
Total assets 2,179,465 1,952,297
Total liabilities 1,530,266 1,346,568
Net assets 649,199 605,729
Sales of JointVentures 351,814 19,851
Profit (loss) for the period of JointVentures ₩ 43,180 ₩ 16,396
Global Trade Of Power System Co., Ltd. [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities Exporting products and technology of small or medium business by proxy Exporting products and technology of small or medium business by proxy
Location KOREA KOREA
Percentage of ownership 29.00% 29.00%
Acquisition cost ₩ 290 ₩ 290
Book value [Abstract]    
Beginning balance 477 426
Share of income (loss) 100 51
Ending balance 577 477
Share in net assets 577 476
Total assets 3,576 1,661
Total liabilities 1,586 18
Net assets 1,990 1,643
Others (consolidated FS)   1
Sales of JointVentures 4,079 2,667
Profit (loss) for the period of JointVentures ₩ 365 ₩ 205
Expressway Solar-light Power Generation Co., Ltd. [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership 29.00% 29.00%
Acquisition cost ₩ 1,856 ₩ 1,856
Book value [Abstract]    
Beginning balance 2,343 2,100
Share of income (loss) 120 243
Ending balance 2,463 2,343
Share in net assets 2,463 2,343
Total assets 19,143 20,790
Total liabilities 10,651 12,710
Net assets 8,492 8,080
Sales of JointVentures 3,018 3,395
Profit (loss) for the period of JointVentures ₩ 643 ₩ 960
KODE NOVUS I LLC [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities Power generation Power generation
Location USA USA
Percentage of ownership 50.00% 50.00%
Acquisition cost ₩ 19,213 ₩ 19,213
Book value [Abstract]    
Share in net assets (53,689) (44,983)
Total assets 755 14,286
Total liabilities 108,132 104,252
Net assets (107,377) (89,966)
Investment differential   4,732
Others (consolidated FS) 53,689 40,251
Sales of JointVentures 14 2,362
Profit (loss) for the period of JointVentures (8,117) (50,151)
Unrecognized equity interest 8,706 22,194
Accumulated unrecognized equity interest ₩ 53,689 ₩ 44,983
KODE NOVUS II LLC [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities Power generation Power generation
Location USA USA
Percentage of ownership 50.00% 50.00%
Acquisition cost ₩ 12,756 ₩ 12,756
Book value [Abstract]    
Acquisition   258
Share of income (loss)   (260)
Others (book value)   2
Share in net assets (23,696) (23,516)
Total assets 292 3,236
Total liabilities 47,683 50,267
Net assets (47,391) (47,031)
Others (consolidated FS) 23,696 23,516
Sales of JointVentures   810
Profit (loss) for the period of JointVentures (6,018) (22,582)
Unrecognized equity interest 181 12,340
Accumulated unrecognized equity interest ₩ 23,696 ₩ 23,515
Daejung Offshore Wind Power Co., Ltd. [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership 49.90% 49.90%
Acquisition cost ₩ 5,190 ₩ 4,990
Book value [Abstract]    
Beginning balance 3,015 3,352
Acquisition 200  
Share of income (loss) (246) (337)
Ending balance 2,969 3,015
Share in net assets 2,969 3,015
Total assets 6,193 6,076
Total liabilities 243 34
Net assets 5,950 6,042
Profit (loss) for the period of JointVentures ₩ (493) ₩ (675)
Shareholders’ agreements that may cause future economic resource or cash outflows In case Samsung Heavy Industries Co., Ltd., a co-participant of the joint venture agreement, decides to dispose of its shares in Daejung Offshore Wind Power Co., Ltd., the Company is obligated to acquire those shares after evaluating the economic feasibility of the facilities installed by Samsung Heavy Industries Co., Ltd.  
Amman Asia Electric Power Company [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities [1] Power generation Power generation
Location [1] JORDAN JORDAN
Percentage of ownership [1] 60.00% 60.00%
Acquisition cost [1] ₩ 111,476 ₩ 111,476
Book value [Abstract]    
Beginning balance 153,857 [1] 137,668
Dividends received (12,213) (12,684)
Share of income (loss) 19,957 17,811
Other comprehensive income (loss) (15,925) 11,062
Ending balance [1] 145,676 153,857
Share in net assets 145,764 153,944
Total assets 759,114 881,164
Total liabilities 516,174 624,590
Net assets 242,940 256,574
Others (consolidated FS) (88) (87)
Sales of JointVentures 18,034 13,631
Profit (loss) for the period of JointVentures ₩ 33,514 ₩ 29,684
KAPES, Inc. (formerly, KEPCO-ALSTOM Power Electronics Systems, Inc.) [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities [1] R&D R&D
Location [1] KOREA KOREA
Percentage of ownership [1] 51.00% 51.00%
Acquisition cost [1] ₩ 5,629 ₩ 5,629
Book value [Abstract]    
Beginning balance 4,758 [1] 4,501
Share of income (loss) 2,752 311
Others (book value) (34) (54)
Ending balance [1] 7,476 4,758
Share in net assets 7,476 4,758
Total assets 70,679 145,576
Total liabilities 56,021 136,247
Net assets 14,658 9,329
Sales of JointVentures 129,962 31,852
Profit (loss) for the period of JointVentures ₩ 5,397 ₩ 456
Dangjin Eco Power Co., Ltd. [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership 34.00% 34.00%
Acquisition cost ₩ 61,540 ₩ 56,100
Book value [Abstract]    
Beginning balance 53,253 48,281
Acquisition 5,440 5,100
Share of income (loss) (752) (696)
Other comprehensive income (loss) (3) (26)
Others (book value) (10) 594
Ending balance 57,928 53,253
Share in net assets 55,310 50,635
Total assets 163,197 149,926
Total liabilities 521 1,001
Net assets 162,676 148,925
Investment differential 2,618 2,618
Profit (loss) for the period of JointVentures ₩ (2,182) ₩ (2,023)
Honam Wind Power Co., Ltd. [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership 29.00% 29.00%
Acquisition cost ₩ 3,480 ₩ 3,480
Book value [Abstract]    
Beginning balance 4,451 3,926
Dividends received (487) (104)
Share of income (loss) 338 629
Ending balance 4,302 4,451
Share in net assets 4,270 4,419
Total assets 39,675 41,614
Total liabilities 24,951 26,375
Net assets 14,724 15,239
Investment differential 32 32
Sales of JointVentures 5,961 6,776
Profit (loss) for the period of JointVentures ₩ 1,166 2,171
Nepal Water & Energy Development Company Private Limited [Member]    
Book value [Abstract]    
Beginning balance   17,765
Share of income (loss)   359
Other comprehensive income (loss)   543
Others (book value)   ₩ (18,667)
Chun-cheon Energy Co., Ltd. [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership 29.90% 29.90%
Acquisition cost ₩ 52,700 ₩ 52,700
Book value [Abstract]    
Beginning balance 50,592 31,976
Acquisition   19,832
Share of income (loss) (2,474) (1,121)
Other comprehensive income (loss)   (95)
Ending balance 48,118 50,592
Share in net assets 48,115 50,589
Total assets 699,652 548,306
Total liabilities 538,733 379,113
Net assets 160,919 169,193
Investment differential 3 3
Sales of JointVentures 164,294  
Profit (loss) for the period of JointVentures ₩ (8,145) ₩ (3,684)
Yeonggwangbaeksu Wind Power Co., Ltd. [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities [3] Power generation Power generation
Location [3] KOREA KOREA
Percentage of ownership [3] 15.00% 15.00%
Acquisition cost [3] ₩ 3,000 ₩ 3,000
Book value [Abstract]    
Beginning balance 2,689 [3] 2,668
Share of income (loss) 45 16
Others (book value)   5
Ending balance [3] 2,734 2,689
Share in net assets 2,728 2,684
Total assets 94,810 99,773
Total liabilities 76,621 81,881
Net assets 18,189 17,892
Investment differential 6 5
Sales of JointVentures 11,124 11,208
Profit (loss) for the period of JointVentures ₩ 297 ₩ (26)
Nghi Son 2 Power Ltd. [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities Power generation Power generation
Location VIETNAM VIETNAM
Percentage of ownership 50.00% 50.00%
Acquisition cost ₩ 2,781 ₩ 1,788
Book value [Abstract]    
Beginning balance 229 269
Acquisition 993 716
Share of income (loss) (1,039) (740)
Other comprehensive income (loss)   (16)
Ending balance 183 229
Share in net assets 183 228
Total assets 741 757
Total liabilities 376 302
Net assets 365 455
Others (consolidated FS)   1
Profit (loss) for the period of JointVentures ₩ (2,068) ₩ (1,481)
Kelar S.A [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities [1] Power generation Power generation
Location [1] CHILE CHILE
Percentage of ownership [1] 65.00% 65.00%
Acquisition cost [1] ₩ 77,220 ₩ 4,180
Book value [Abstract]    
Acquisition 73,040  
Share of income (loss) (633)  
Other comprehensive income (loss) (5,175)  
Others (book value) 1  
Ending balance [1] 67,233  
Share in net assets 65,125 (61,309)
Total assets 613,293 617,803
Total liabilities 513,101 712,124
Net assets 100,192 (94,321)
Investment differential 2,424 2,424
Others (consolidated FS) (316) 58,885
Sales of JointVentures 90,435  
Profit (loss) for the period of JointVentures 17,590 (4,109)
Unrecognized equity interest ₩ (61,309) 43,920
Accumulated unrecognized equity interest   ₩ 61,309
PT. Tanjung Power Indonesia [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities Power generation Power generation
Location INDONESIA INDONESIA
Percentage of ownership 35.00% 35.00%
Acquisition cost ₩ 746 ₩ 746
Book value [Abstract]    
Beginning balance 1,946 617
Share of income (loss) 2,112 1,337
Other comprehensive income (loss) (2,281)  
Others (book value) (1) (8)
Ending balance 1,776 1,946
Share in net assets 1,776 1,946
Total assets 374,702 203,051
Total liabilities 369,627 197,491
Net assets 5,075 5,560
Sales of JointVentures 209,923 122,583
Profit (loss) for the period of JointVentures ₩ 6,219 ₩ 3,821
Incheon New Power Co., Ltd. [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership 29.00% 29.00%
Acquisition cost ₩ 461 ₩ 461
Book value [Abstract]    
Beginning balance 563 514
Share of income (loss) 56 41
Other comprehensive income (loss)   8
Ending balance 619 563
Share in net assets 619 563
Total assets 7,194 7,902
Total liabilities 5,059 5,961
Net assets 2,135 1,941
Sales of JointVentures 2,972 2,985
Profit (loss) for the period of JointVentures ₩ 184 ₩ 168
Seokmun Energy Co., Ltd. [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities Power generation Power generation
Location KOREA KOREA
Percentage of ownership 29.00% 29.00%
Acquisition cost ₩ 15,370 ₩ 580
Book value [Abstract]    
Beginning balance 391  
Acquisition 14,790  
Share of income (loss) (1,219) (197)
Other comprehensive income (loss) (176) 793
Others (book value)   (205)
Ending balance 13,786 391
Share in net assets 13,786 391
Total assets 247,735 235,905
Total liabilities 200,197 234,556
Net assets 47,538 1,349
Sales of JointVentures 35,135  
Profit (loss) for the period of JointVentures ₩ (3,939) (543)
Unrecognized equity interest   ₩ (205)
Daehan Wind Power PSC [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities Power generation Power generation
Location JORDAN JORDAN
Percentage of ownership 50.00% 50.00%
Acquisition cost ₩ 285 ₩ 285
Book value [Abstract]    
Beginning balance 16  
Acquisition   285
Share of income (loss) (40) (261)
Other comprehensive income (loss) 22 (8)
Others (book value) 2  
Ending balance   16
Share in net assets (412) 18
Total assets 928 750
Total liabilities 1,752 714
Net assets (824) 36
Others (consolidated FS) 412 (2)
Profit (loss) for the period of JointVentures (904) ₩ (523)
Unrecognized equity interest 412  
Accumulated unrecognized equity interest ₩ 412  
Barakah One Company [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities [4] Power generation Power generation
Location [4] UAE UAE
Percentage of ownership [4] 18.00% 18.00%
Acquisition cost [4] ₩ 118 ₩ 118
Book value [Abstract]    
Beginning balance [4] 116  
Acquisition   118
Share of income (loss) 570  
Other comprehensive income (loss) (60)  
Others (book value)   (2)
Ending balance [4] 626 116
Share in net assets 626 118
Total assets 17,574,885 17,117,338
Total liabilities 17,571,409 17,116,680
Net assets 3,476 658
Others (consolidated FS)   ₩ (2)
Profit (loss) for the period of JointVentures ₩ (1,358)  
Nawah Energy Company [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities [4] Operation of utility plant Operation of utility plant
Location [4] UAE UAE
Percentage of ownership [4] 18.00% 18.00%
Acquisition cost [4] ₩ 296 ₩ 296
Book value [Abstract]    
Beginning balance [4] 290  
Acquisition   296
Share of income (loss) (5)  
Other comprehensive income (loss) (27)  
Others (book value)   (6)
Ending balance [4] 258 290
Share in net assets 258 296
Total assets 1,459 1,645
Total liabilities 23  
Net assets 1,436 1,645
Others (consolidated FS)   ₩ (6)
Profit (loss) for the period of JointVentures ₩ (11)  
MOMENTUM [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities International thermonuclear experimental reactor construction management International thermonuclear experimental reactor construction management
Location FRANCE FRANCE
Percentage of ownership 33.33% 33.33%
Acquisition cost ₩ 1 ₩ 1
Book value [Abstract]    
Beginning balance 67  
Acquisition   1
Share of income (loss) 321 65
Other comprehensive income (loss) 3  
Others (book value)   1
Ending balance 391 67
Share in net assets 391 67
Total assets 5,028 2,749
Total liabilities 3,854 2,547
Net assets 1,174 202
Sales of JointVentures 11,555 2,886
Profit (loss) for the period of JointVentures ₩ 939 ₩ 194
Daegu Green Power [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities Power generation Power generation [5]
Location KOREA KOREA [5]
Percentage of ownership 29.00% 29.00% [5]
Acquisition cost ₩ 46,225 ₩ 46,225 [5]
Book value [Abstract]    
Beginning balance [5] 47,528  
Share of income (loss) (5,133)  
Others (book value) (4) 47,528
Ending balance 42,391 47,528 [5]
Share in net assets 20,795 25,932
Total assets 602,809 636,438
Total liabilities 531,103 547,017
Net assets 71,706 89,421
Investment differential   84
Intercompany transaction 84  
Others (consolidated FS) 21,512 21,512
Sales of JointVentures 256,359 265,621
Profit (loss) for the period of JointVentures ₩ (17,700) ₩ (3,981)
Significant restrictions on its abilities Principals on subordinated loans or dividends can only be paid when all conditions of the loan agreement are satisfied or prior written consent of financial institutions is obtained. Shares cannot be wholly or partially transferred without prior written consent of financial institutions is obtained.  
Yeonggwang Wind Power Co., Ltd [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities Power generation  
Location KOREA  
Percentage of ownership 41.00%  
Acquisition cost ₩ 15,375  
Book value [Abstract]    
Acquisition 15,375  
Share of income (loss) (25)  
Other comprehensive income (loss) (56)  
Ending balance 15,294  
Share in net assets 15,063  
Total assets 212,802  
Total liabilities 176,062  
Net assets 36,740  
Investment differential 231  
Profit (loss) for the period of JointVentures ₩ (62)  
Chester Solar IV SpA [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities [1] Power generation  
Location [1] CHILE  
Percentage of ownership [1] 81.82%  
Acquisition cost [1] ₩ 1,700  
Book value [Abstract]    
Acquisition 1,700  
Ending balance [1] 1,700  
Share in net assets 1,664  
Total assets 11,660  
Total liabilities 9,626  
Net assets 2,034  
Others (consolidated FS) 36  
Sales of JointVentures 331  
Profit (loss) for the period of JointVentures ₩ 151  
Chester Solar V SpA [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities [1] Power generation  
Location [1] CHILE  
Percentage of ownership [1] 81.82%  
Acquisition cost [1] ₩ 525  
Book value [Abstract]    
Acquisition 525  
Ending balance [1] 525  
Share in net assets 419  
Total assets 2,081  
Total liabilities 1,569  
Net assets 512  
Others (consolidated FS) 106  
Profit (loss) for the period of JointVentures ₩ (49)  
Diego de Almagro Solar SpA [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities [1] Power generation  
Location [1] CHILE  
Percentage of ownership [1] 81.82%  
Acquisition cost [1] ₩ 2,091  
Book value [Abstract]    
Acquisition 2,091  
Ending balance [1] 2,091  
Share in net assets 1,993  
Total assets 8,266  
Total liabilities 5,830  
Net assets 2,436  
Others (consolidated FS) 98  
Profit (loss) for the period of JointVentures ₩ (103)  
South Jamaica Power Company Limited [Member]    
Disclosure of joint ventures [Line Items]    
Key operation activities Power generation  
Location JAMAICA  
Percentage of ownership 20.00%  
Acquisition cost ₩ 7,090  
Book value [Abstract]    
Acquisition 7,090  
Others (book value) (386)  
Ending balance 6,704  
Share in net assets 6,704  
Total assets 153,958  
Total liabilities 120,436  
Net assets 33,522  
Profit (loss) for the period of JointVentures ₩ (755)  
[1] According to the shareholders’ agreement, all critical financial and operating decisions must be agreed to by all ownership parties. For these reasons, the entities are classified as joint ventures.
[2] The Company has joint control over the entity by virtue of its contractual right to appoint directors to the board of directors of the entity, and by strict decision criteria of the Company’s financial and operating policy of the board of directors.
[3] The Company can exercise significant influence by virtue of its contractual right to appoint a director to the board of directors of the entity.
[4] The effective percentage of ownership is less than 20% but the Company has joint control over the entity as decisions on the major activities require the unanimous consent of the parties that collectively control the entity.
[5] The entity is reclassified from associates to joint ventures since the terms of the shareholders’ agreement had been amended.