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Related Parties - Summary of Transactions Between Related Parties (Details)
$ in Thousands, ₩ in Millions
 12 Months Ended
Dec. 31, 2023
KRW (₩)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
KRW (₩)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
KRW (₩)
Dec. 31, 2021
USD ($)
Disclosure of transactions between related parties [line items]            
Dividend income ₩ 25,941   ₩ 28,875   ₩ 10,522  
Korea Gas Corporation            
Disclosure of transactions between related parties [line items]            
Electricity sales 140,630   155,309   96,362  
Electricity purchase 8,873,781   11,996,402   5,646,713  
Outstanding balances for related party transactions [abstract]            
Trade receivables 14,671   12,415      
Trade payables 480,974   1,882,607      
Non-trade receivables and others 12,513   54,232      
Non-trade payables and others 1,378   1,294      
Goseong Green Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 842,270   1,062,108   514,470  
Electricity purchase 1,572,074   1,905,502   987,540  
Outstanding balances for related party transactions [abstract]            
Trade receivables 55,719   76,254      
Trade payables 120,270   182,095      
Non-trade receivables and others 15   14      
Non-trade payables and others 48,621   52,515      
Dongducheon Dream Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 16,138   8,942   19,923  
Electricity purchase 1,744,247   2,244,332   750,148  
Outstanding balances for related party transactions [abstract]            
Trade receivables 2,573   592      
Trade payables 117,975   293,256      
Non-trade receivables and others 478   270      
Saemangeum Sebit Power Plant Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 2,313   1,418   0  
Electricity purchase 22,365   23,159   0  
Outstanding balances for related party transactions [abstract]            
Non-trade receivables and others 341   653      
Non-trade payables and others     0      
Daejung Offshore Wind Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 84   46   46  
Outstanding balances for related party transactions [abstract]            
Non-trade receivables and others 263   123      
Daegu Photovoltaic Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 408   268   207  
Electricity purchase 4,247   4,744   3,532  
Outstanding balances for related party transactions [abstract]            
Trade payables 105   135      
Non-trade payables and others     2      
Haeng Bok Do Si Photovoltaic Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 3   2   2  
Electricity purchase 408   563   393  
Korea Electric Power Industrial Development Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Service 11,115   10,369   11,208  
Service 305,105   251,468   241,925  
Outstanding balances for related party transactions [abstract]            
Trade receivables 176   164      
Trade payables 2,021   150      
Non-trade receivables and others     2      
Non-trade payables and others 8,077   9,588      
Gangneung Eco Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Fuel sales 943,063   459,404   14,200  
Others 6,996   0   0  
Outstanding balances for related party transactions [abstract]            
Trade receivables 59,623   19,364      
Non-trade receivables and others     478      
Non-trade payables and others 94   94      
Shin Pyeongtaek Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 91,830   27,486   23,501  
Electricity purchase 1,040,965   957,294   653,306  
Outstanding balances for related party transactions [abstract]            
Trade receivables 1,814   7,375      
Trade payables 86,801   109,274      
Non-trade receivables and others 4,933   1,068      
Non-trade payables and others 385   101      
Noeul Green Energy Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 8,431   9,396   30  
Electricity purchase 10,466   14,176   10,014  
Outstanding balances for related party transactions [abstract]            
Trade receivables 6   3      
Non-trade receivables and others 18,356   9,365      
Non-trade payables and others 3,005   2,468      
Samcheok Eco Materials Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 615   546   620  
Electricity purchase 8,130   12,019   13,612  
Outstanding balances for related party transactions [abstract]            
Trade receivables 33   46      
YTN Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 2,908   2,180   1,922  
Electricity purchase 309   304   388  
Outstanding balances for related party transactions [abstract]            
Trade receivables 133   112      
Busan Green Energy Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 10,733   5,055   49  
Electricity purchase 23,211   26,219   18,996  
Outstanding balances for related party transactions [abstract]            
Trade receivables 1   1      
Non-trade receivables and others 32,720   26,681      
Non-trade payables and others 3,642   4,415      
Gunsan Bio Energy Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 0   0   20  
Outstanding balances for related party transactions [abstract]            
Non-trade receivables and others [1]     11,728      
Korea Electric Vehicle Charging Service            
Disclosure of transactions between related parties [line items]            
Electricity sales [2] 0   3,686   3,039  
Electricity purchase [2] 0   0   393  
Energy Infra Asset Management Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 89   0   4,629  
Service 2,701   2,779   2,657  
YaksuESS Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity purchase 508   851   1,715  
Outstanding balances for related party transactions [abstract]            
Trade payables 538          
Gangwon Wind Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 2,464   1,549   1,865  
Electricity purchase 32,525   40,130   19,623  
Outstanding balances for related party transactions [abstract]            
Trade receivables 13   6      
Trade payables 3,206   5,197      
Goesan Solar park Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity purchase 6,530   7,642   6,209  
Outstanding balances for related party transactions [abstract]            
Trade payables 56   346      
Gwangyang Green Energy Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 1,492   1,848   486  
Outstanding balances for related party transactions [abstract]            
Trade receivables 1,069          
Non-trade receivables and others 716   1,436      
Bigeum Resident Photovoltaic Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 888   660   755  
Outstanding balances for related party transactions [abstract]            
Trade receivables 406   343      
Non-trade receivables and others 1,316   516      
Hyundai Green Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales and design service 6,668   7,063   11,934  
Outstanding balances for related party transactions [abstract]            
Trade receivables 903   839      
Korea Power Exchange            
Disclosure of transactions between related parties [line items]            
Service 52,262   16,596   39,796  
Service 82,572   93,817   86,716  
Outstanding balances for related party transactions [abstract]            
Trade receivables 1,583   223      
Trade payables 16,367          
Non-trade receivables and others 1          
Non-trade payables and others 2,520   2,405      
Taebaek Wind Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Service [3] 0   861   44  
Others [3] 2,864   0   0  
Service [3] 7,476   0   0  
Service and REC [3] 0   7,442   5,930  
Outstanding balances for related party transactions [abstract]            
Trade payables 603 [3]   680      
Non-trade payables and others 341 [3]   178      
Taebaek Guinemi Wind Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 0   0   26  
Electricity purchase 5,529   6,793   5,910  
Outstanding balances for related party transactions [abstract]            
Trade payables 572          
Non-trade payables and others 286   885      
Pyeongchang Wind Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 0   1,323   1,180  
Design service and others 0   3,884   4,099  
Outstanding balances for related party transactions [abstract]            
Trade receivables 4   3 [3]      
Non-trade payables and others     211      
Pyeongchang Wind Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 2,087   0   0  
REC and others 3,542   0   0  
Daeryun Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 3,187   2,016   1,944  
Electricity purchase 353,371   428,534   157,234  
Outstanding balances for related party transactions [abstract]            
Trade receivables 326   195      
Trade payables 32,140   55,725      
Changjuk Wind Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales [4] 0   1,350   463  
Electricity purchase [4] 0   9,027   6,213  
GS Donghae Electric Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 28,164   5,238   21,127  
Electricity purchase 1,047,584   1,035,263   760,377  
Outstanding balances for related party transactions [abstract]            
Trade receivables 159   872      
Trade payables 72,951   72,947      
Non-trade receivables and others 169   1,558      
Non-trade payables and others 125   14,565      
KNH Solar Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 15   13   14  
Electricity purchase 3,535   4,348   3,222  
Outstanding balances for related party transactions [abstract]            
Trade receivables 1   1      
S-Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Service 4,965   4,588   5,229  
Service 973,646   1,091,741   608,530  
Outstanding balances for related party transactions [abstract]            
Trade receivables 213   77      
Trade payables 79,459   135,504      
Non-trade receivables and others 53   44      
Non-trade payables and others     11      
Chuncheon Green Energy Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 82   2   0  
Yeongyang Wind Power Corporation II            
Disclosure of transactions between related parties [line items]            
Commission 150   0   0  
Commission 1,457   0   0  
Outstanding balances for related party transactions [abstract]            
Non-trade receivables and others 165          
PND Solar Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 547   427   416  
Electricity purchase 5,301   6,173   5,502  
Outstanding balances for related party transactions [abstract]            
Trade payables 296   210      
Hyundai Eco Energy Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 1,236   277   187  
Electricity purchase 26,266   29,209   25,762  
Outstanding balances for related party transactions [abstract]            
Trade receivables 28   22      
Trade payables 408   738      
YeongGwang Yaksu Wind Electric Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 96   66   78  
Electricity purchase 6,776   7,382   11,729  
Outstanding balances for related party transactions [abstract]            
Trade receivables 10   7      
Trade payables 828   589      
Non-trade receivables and others 2,294          
Non-trade payables and others     2,050      
Taebaek Gadeoksan Wind Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 3,998   1,952   295  
Electricity purchase 34,940   25,880   16,360  
Outstanding balances for related party transactions [abstract]            
Trade payables 12,739   12,739      
Non-trade receivables and others 1,539   97      
Non-trade payables and others 7   5      
Korea Energy Solutions Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 2   2   2  
Electricity purchase 128   102   0  
Outstanding balances for related party transactions [abstract]            
Non-trade payables and others     94      
ITR Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Service 3   6   3  
STN Co., Ltd. (formerly, Structure test network Co., Ltd.)            
Disclosure of transactions between related parties [line items]            
Service 0   7   5  
Others 10   0   0  
Green Energy Electricity Generation Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity purchase 948   2,962   1,238  
Outstanding balances for related party transactions [abstract]            
Trade payables 62          
Non-trade payables and others 45          
Namjeongsusang Solar Power Operation Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales [5] 31   21   22  
Electricity purchase [5] 0   9,491   14,286  
Outstanding balances for related party transactions [abstract]            
Trade receivables [5]     2      
Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1            
Disclosure of transactions between related parties [line items]            
Service 405   394   399  
Bitgoel Eco Energy Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 1,581   1,397   282  
Service and others 28,334   930   0  
Outstanding balances for related party transactions [abstract]            
Trade payables 6,226          
Non-trade receivables and others 131   6      
Non-trade payables and others     1,023      
Jeju Gimnyeong Wind Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 315   367   0  
Electricity purchase 8,635   12,364   12,833  
Outstanding balances for related party transactions [abstract]            
Trade payables 1,467   1,758      
Non-trade receivables and others 112   130      
Non-trade payables and others 9          
Seoroseoro Sunny Power Plant Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 2   1   0  
REC and others 874   1,138   217  
Muan Solar park Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 3,083   950   232  
REC and others 16,554   17,052   31,017  
Outstanding balances for related party transactions [abstract]            
Trade receivables     25      
Non-trade receivables and others 4   9      
YuDang Solar Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 100   160   0  
REC and others 1,860   1,915   3,495  
Anjwa Smart Farm & Solar City Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 2,479   1,068   624  
Electricity purchase 17,332   16,942   24,601  
Outstanding balances for related party transactions [abstract]            
Non-trade payables and others 1,296   921      
KPE Green Energy Co., Ltd. (formerly, Daewon Green Energy Co., Ltd.)            
Disclosure of transactions between related parties [line items]            
Electricity sales 163   185   155  
Others 62,212   42,651   0  
Outstanding balances for related party transactions [abstract]            
Trade receivables 1   1      
Trade payables 5,485   5,485      
Saemangeum Heemang Photovoltaic Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 3,538   5,740   13  
Electricity purchase 440   1,039   0  
Outstanding balances for related party transactions [abstract]            
Non-trade receivables and others     3,435      
Non-trade payables and others     1      
G.GURU Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity purchase 0   452   0  
UD4M Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 3   2   4  
Electricity purchase 117   313   0  
Dongbu Highway Solar Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 11   8   5  
Electricity purchase 2,937   3,516   2,605  
Outstanding balances for related party transactions [abstract]            
Trade receivables 1   1      
Trade payables     2      
Non-trade payables and others     2      
Seobu Highway Solar Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 12   8   8  
Electricity purchase 2,880   3,452   2,963  
Outstanding balances for related party transactions [abstract]            
Trade receivables 1   1      
Trade payables     8      
Non-trade payables and others     3      
REC's Innovation Co., Ltd. (formerly, Wang San Engineering. Co,. Ltd.)            
Disclosure of transactions between related parties [line items]            
Interest income/ Dividends income [6] 6   0   0  
Green Radiation Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Ordinary development expense 11   0   0  
Santiago Solar Power SpA            
Disclosure of transactions between related parties [line items]            
Dividend income 586   0   0  
Gwangbaek Solar Power Investment Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 644   0   0  
Electricity purchase 565   602   742  
Outstanding balances for related party transactions [abstract]            
Non-trade payables and others     61      
Go deok Clean Energy Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 4,685   0   0  
Electricity purchase 11,545   0   0  
Hankook Electric Power Information Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 0   0   1  
SureDataLab Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 1   1   1  
Suwon New Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 91   118   1,820  
Outstanding balances for related party transactions [abstract]            
Trade receivables 876   0      
Non-trade receivables and others 560   1,280      
Non-trade payables and others 0          
Kosture Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 0   5   1  
Outstanding balances for related party transactions [abstract]            
Trade receivables     6      
PlatformN. Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Others 16   14   0  
Others 0   475   0  
Outstanding balances for related party transactions [abstract]            
Non-trade payables and others     232      
Gangneung Sacheon Fuel Cell Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 133   151   0  
Electricity purchase 1,324   0   0  
Muan Sunshine Solar Power Plant Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 403   17   52  
Electricity purchase 16,328   19,514   15,900  
Outstanding balances for related party transactions [abstract]            
Trade payables 1,440   3,076      
Non-trade payables and others     1,265      
11 Associates (Overseas)            
Disclosure of transactions between related parties [line items]            
Electricity sales 385,605   548,507   125,723  
Electricity purchase 91,233   101,790   502  
Seobusambo highway photovoltaics Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 16   3   0  
Electricity purchase 502   103   0  
Outstanding balances for related party transactions [abstract]            
Trade receivables 1          
Non-trade receivables and others 4          
Yangyang Suri Wind Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 169   0   0  
Outstanding balances for related party transactions [abstract]            
Non-trade receivables and others 55          
Naepo Green Energy Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 3,462   761   467  
Outstanding balances for related party transactions [abstract]            
Trade receivables 190   169      
Non-trade receivables and others 1          
Non-trade payables and others     3      
Cheongna Energy Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Others 32,835   39,802   16,469  
Electricity purchase 60   80   57  
Outstanding balances for related party transactions [abstract]            
Trade receivables 13,898   17,324      
Non-trade receivables and others 2,160   1,654      
Non-trade payables and others 1   1      
Boim Combined Heat and Power Generation Co., Ltd. (formerly, Dayone Energy Co., Ltd.)            
Disclosure of transactions between related parties [line items]            
Service 2,110   7,761   8,159  
Electricity purchase [7] 8,151   13,872   5,409  
Outstanding balances for related party transactions [abstract]            
Trade receivables 84   79      
Trade payables 721   1,027      
Non-trade receivables and others 10,779   10,218      
Non-trade payables and others 14,193   9,119      
Daegu Green Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 1,694   1,190   1,053  
Electricity purchase 370,787   508,601   289,052  
Outstanding balances for related party transactions [abstract]            
Trade receivables 122   53      
Non-trade receivables and others 55   56      
Non-trade payables and others 32,222   66,715      
KAPES, Inc.            
Disclosure of transactions between related parties [line items]            
Commission 1,604   450   413  
Electricity purchase 19,112   9,306   64,140  
Outstanding balances for related party transactions [abstract]            
Trade receivables 4   2      
Non-trade receivables and others 89          
Non-trade payables and others 3,791   106      
Prime Swedish Holding AB            
Disclosure of transactions between related parties [line items]            
Electricity sales 292   284   0  
Honam Wind Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 610   242   71  
Electricity purchase 8,643   7,662   4,807  
Outstanding balances for related party transactions [abstract]            
Trade payables 515   515      
Jeongam Wind Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales and design service 0   0   588  
Electricity purchase 0   0   3,145  
Korea Power Engineering Service Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Service 159   268   339  
Service 812   830   1,315  
Outstanding balances for related party transactions [abstract]            
Non-trade receivables and others 48   47      
Non-trade payables and others 76   77      
Seokmun Energy Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Service 1,792   1,685   1,701  
Service 60,009   60,799   44,315  
Outstanding balances for related party transactions [abstract]            
Trade receivables 44   67      
Trade payables 7,000   7,000      
Non-trade receivables and others 199   113      
Incheon New Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Construction revenue 458   14   14  
Chun-cheon Energy Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 2,976   2,505   2,329  
Electricity purchase 585,656   585,689   327,536  
Outstanding balances for related party transactions [abstract]            
Trade receivables 239   124      
Trade payables 79,117   79,117      
Non-trade receivables and others 165   165      
Non-trade payables and others 2          
Yeonggwangbaeksu Wind Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 1,962   1,898   1,836  
Electricity purchase 17,228   13,990   9,471  
Outstanding balances for related party transactions [abstract]            
Trade receivables 10   8      
Trade payables 1,076   1,076      
Non-trade receivables and others     166      
Yeonggwang Wind Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 3,607   871   818  
Electricity purchase 40,605   31,221   21,004  
Outstanding balances for related party transactions [abstract]            
Trade receivables 15   12      
Trade payables 2,251   2,251      
Non-trade receivables and others 56   62      
Western Power Changgi Solar Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 0   0   1,920  
Electricity purchase 0   0   5,852  
NH-Amundi Global Infrastructure Investment Private Investment Trust 21            
Disclosure of transactions between related parties [line items]            
Service 1,568   1,415   1,727  
KW Nuclear Components Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Service 1,612   1,624   2,598  
Service 14,114   9,504   96  
Outstanding balances for related party transactions [abstract]            
Trade receivables     4      
Non-trade receivables and others 17   18      
KEPCO-Uhde Inc.            
Disclosure of transactions between related parties [line items]            
Electricity sales [8] 0   12   10  
Outstanding balances for related party transactions [abstract]            
Non-trade payables and others [8]     10      
Busan Shinho Solar Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 1,205   502   376  
REC and others 10,248   10,601   7,895  
Outstanding balances for related party transactions [abstract]            
Trade receivables 3   3      
Trade payables 304   304      
Expressway Solar-light Power Generation Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 43   0   0  
Electricity purchase 3,362   4,016   3,146  
Outstanding balances for related party transactions [abstract]            
Trade payables 220   166      
Goheung New Energy Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales [7] 3,214   141   0  
Electricity purchase | $   $ 5,264   $ 0   $ 0
Gunsan Land Solar Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 809   518   0  
Electricity purchase 486   533   0  
Outstanding balances for related party transactions [abstract]            
Non-trade receivables and others 295   138      
Daesan Green Energy Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 760   394   523  
Electricity purchase 139,721   129,736   146,776  
Outstanding balances for related party transactions [abstract]            
Trade receivables 13   18      
Trade payables 4,946   4,946      
Non-trade receivables and others 170   218      
Cheong-Song Noraesan Wind Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 901   698   30  
Electricity purchase 882   980   0  
Outstanding balances for related party transactions [abstract]            
Trade receivables 2   2      
Chungsongmeon BongSan wind power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 1   1   1  
Saemangeum Solar Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Service 0   100   1,141  
Electricity purchase 0   1   5  
Outstanding balances for related party transactions [abstract]            
Non-trade receivables and others 4,368   4,368      
Dangjin Eco Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 40   32   32  
Electricity purchase 5,583   5,696   4,139  
Outstanding balances for related party transactions [abstract]            
Trade receivables 4   3      
Trade payables 222   222      
Non-trade payables and others 176   105      
Yangyang Wind Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 13   0   0  
Service and Electricity Sales 10   0   0  
Outstanding balances for related party transactions [abstract]            
Non-trade receivables and others 13          
Energyco Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 457   463   1  
Electricity purchase 6,539   7,898   0  
Outstanding balances for related party transactions [abstract]            
Trade payables 99          
Non-trade receivables and others 3          
Hapcheon Floating Photovoltaic Power Plant Inc.            
Disclosure of transactions between related parties [line items]            
Electricity sales 88   544   0  
Service and REC 0   2,526   0  
Outstanding balances for related party transactions [abstract]            
Trade receivables 10   9      
Non-trade receivables and others 68          
Busan Industrial Solar Power Co., Ltd.            
Outstanding balances for related party transactions [abstract]            
Trade receivables 2   2      
Busan Industrial Solar Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 22   14   9  
Electricity purchase 3,656   4,575   2,815  
Bitsolar Energy Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 357   498   296  
Electricity purchase 12,946   13,030   5,703  
Outstanding balances for related party transactions [abstract]            
Trade payables 201   201      
Non-trade receivables and others 1   222      
Non-trade payables and others 0          
Omisan Wind Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 26   1   1  
Electricity purchase 0   0   7  
S-Power Chile SpA            
Disclosure of transactions between related parties [line items]            
Interest income 20   0   0  
Haemodum Solar Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 431   42   6  
Electricity purchase 402   2,168   1,625  
Outstanding balances for related party transactions [abstract]            
Trade receivables 1   1      
Yeongam Solar Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 1,131   379   339  
Electricity purchase 34,981   44,745   47,805  
Outstanding balances for related party transactions [abstract]            
Trade receivables 56   44      
Trade payables 3,517   3,655      
Samsu Wind Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 514   0   0  
Electricity purchase 8,269   10,605   2,800  
Outstanding balances for related party transactions [abstract]            
Trade payables 1,229   1,303      
Solaseado Solar Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 1,876   1,851   2,890  
Electricity purchase [7] 18,259   28,698   31,031  
Outstanding balances for related party transactions [abstract]            
Non-trade receivables and others 24   23      
Non-trade payables and others     2,911      
Yeongwol Eco Wind Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 102   0   0  
Gurae Resident Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 8   0   0  
Electricity purchase 1   0   0  
Cheongju Eco Park Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 6,397   204   0  
Electricity purchase 95,059   94,409   0  
Outstanding balances for related party transactions [abstract]            
Trade receivables 6,899          
Trade payables 7,994   7,994      
Enel X Midland Photovoltaic, LLC            
Disclosure of transactions between related parties [line items]            
Electricity sales 11   12   0  
Electricity purchase 2,431   1,871   0  
Outstanding balances for related party transactions [abstract]            
Trade receivables 1   1      
Trade payables 144   3      
Non-trade payables and others 49          
Eumseong Eco Park Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 19   2   0  
Electricity purchase 27,765   0   0  
Geumsungsan Wind Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 68   7   0  
Outstanding balances for related party transactions [abstract]            
Trade receivables 4   3      
Non-trade payables and others     1      
41 Joint ventures (Overseas)            
Disclosure of transactions between related parties [line items]            
Electricity sales 746,989   606,513   773,291  
Electricity purchase 17,222   16,859   54,135  
Korea Development Bank            
Disclosure of transactions between related parties [line items]            
Electricity sales 5,467   4,134   4,177  
Dividends paid 0   12   256,862  
Interest income 5,930   2,222   756  
Interest expense 5,559   4,208   2,756  
Outstanding balances for related party transactions [abstract]            
Non-trade receivables and others 33,140   30,836      
Non-trade payables and others 147   101      
Accrued interest income     5      
Derivative assets 45,898   67,662      
Derivative liabilities 72,050   3,759      
Go deok Clean Energy Co., Ltd            
Outstanding balances for related party transactions [abstract]            
Non-trade receivables and others 4,562          
Non-trade payables and others 5,288          
9 Associates (Overseas)            
Outstanding balances for related party transactions [abstract]            
Non-trade receivables and others 77,814   49,409      
Non-trade payables and others 6,242   502      
Tronix Co., Ltd.            
Outstanding balances for related party transactions [abstract]            
Non-trade receivables and others     1      
8 Associates (Overseas)            
Outstanding balances for related party transactions [abstract]            
Trade receivables     93      
Global Trade Of Power System Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Service 223   715   ₩ 323  
26 Joint ventures (Overseas)            
Outstanding balances for related party transactions [abstract]            
Trade receivables 160,474   73,805      
Non-trade receivables and others 55,897   71,661      
Non-trade payables and others 22,877   ₩ 117,754      
KEPCO Lebanon SARL            
Outstanding balances for related party transactions [abstract]            
Trade receivables [9] ₩ 75          
[1] Busan Green Energy Co., Ltd. was declared bankrupt for the year ended December 31, 2023 and was excluded from an associate due to the appointment of a bankruptcy trustee.
[2] Korea Electric Vehicle Charging Service is not a related party of the Company as of December 31, 2023 as the sale of shares was completed for the year ended December 31, 2022.
[3] Taebaek Wind Power Co., Ltd. was changed from an associate to a joint venture for the year ended December 31, 2023.
[4] Changjuk Wind Power Co., Ltd. was reclassified from an associate to a subsidiary for the year ended December 31, 2022, and the amount is before reclassification to a subsidiary.
[5] Namjeongsusang Solar Power Operation Co., Ltd. is not a related party of the Company as of December 31, 2023 as the sale of shares was completed for the year ended December 31, 2023.
[6] The Company has disposed of shares of Korea Electric Vehicle Charging Service during the year ended December 31, 2022, and it is not a related party to the Company as of December 31, 2022.
[7] Reclassified from a joint venture to a subsidiary during the year ended December 31, 2022. Transactions are made before the reclassification.
[8] KEPCO-Uhde Inc. is not a related party of the Company as of December 31, 2023 as the liquidation process was completed for the year ended December 31, 2023.
[9] The entire amount has been set as bad debt.