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