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Related Parties - Summary of Transactions Between Related Parties (Details)
$ in Thousands, ₩ in Millions
 12 Months Ended
Dec. 31, 2024
KRW (₩)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
KRW (₩)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
KRW (₩)
Dec. 31, 2022
USD ($)
Disclosure of transactions between related parties [line items]            
Dividends income ₩ 70,601   ₩ 25,941   ₩ 28,875  
Korea Gas Corporation            
Disclosure of transactions between related parties [line items]            
Electricity sales 149,095   140,630   155,309  
Electricity purchase 6,623,974   8,873,781   11,996,402  
Outstanding balances for related party transactions [abstract]            
Trade receivables 15,766   14,671      
Trade payables 482,008   480,974      
Non-trade receivables and others 404   12,513      
Non-trade payables and others 1,486   1,378      
Goseong Green Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 612,327   842,270   1,062,108  
Electricity purchase 1,301,710   1,572,074   1,905,502  
Outstanding balances for related party transactions [abstract]            
Trade receivables 30,732   55,719      
Trade payables 162,719   120,270      
Non-trade receivables and others 1,438   15      
Non-trade payables and others 45,174   48,621      
Dongducheon Dream Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 17,151   16,138   8,942  
Electricity purchase 1,360,837   1,744,247   2,244,332  
Outstanding balances for related party transactions [abstract]            
Trade receivables 6,350   2,573      
Trade payables 114,962   117,975      
Non-trade receivables and others 637   478      
Non-trade payables and others 29          
Saemangeum Sebit Power Plant Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 1,693   2,313   1,418  
Electricity purchase 19,753   22,365   23,159  
Outstanding balances for related party transactions [abstract]            
Trade receivables 156          
Trade payables 1,499          
Non-trade receivables and others 47   341      
Daejung Offshore Wind Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 87   84   46  
Outstanding balances for related party transactions [abstract]            
Non-trade receivables and others 349   263      
Daegu Photovoltaic Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 344   408   268  
Electricity purchase 3,815   4,247   4,744  
Outstanding balances for related party transactions [abstract]            
Trade payables 108   105      
Haeng Bok Do Si Photovoltaic Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 3   3   2  
Electricity purchase 427   408   563  
Korea Electric Power Industrial Development Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Service 11,180   11,115   10,369  
Service 317,114   305,105   251,468  
Outstanding balances for related party transactions [abstract]            
Trade receivables 123   176      
Gangneung Eco Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Fuel sales 494,428   943,063   459,404  
Others 1,134   6,996   0  
Outstanding balances for related party transactions [abstract]            
Trade receivables 8,142   59,623      
Non-trade payables and others 105   94      
Shin Pyeongtaek Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 55,610   91,830   27,486  
Electricity purchase 843,056   1,040,965   957,294  
Outstanding balances for related party transactions [abstract]            
Trade receivables 1,720   1,814      
Trade payables 77,222   86,801      
Non-trade receivables and others 5,812   4,933      
Non-trade payables and others 2,450   385      
Noeul Green Energy Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 8,009   8,431   9,396  
Electricity purchase 20,833   10,466   14,176  
Outstanding balances for related party transactions [abstract]            
Trade receivables 5   6      
Non-trade receivables and others 27,043   18,356      
Non-trade payables and others 3,699   3,005      
Samcheok Eco Materials Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales [1] 0   615   546  
Electricity purchase [1] 0   8,130   12,019  
Outstanding balances for related party transactions [abstract]            
Trade receivables [1]     33      
YTN Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales [2] 0   2,908   2,180  
Electricity purchase [2] 0   309   304  
Outstanding balances for related party transactions [abstract]            
Trade receivables [2]     133      
Busan Green Energy Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 11,794   10,733   5,055  
Electricity purchase 28,272   23,211   26,219  
Outstanding balances for related party transactions [abstract]            
Trade receivables 1   1      
Non-trade receivables and others 43,790   32,720      
Non-trade payables and others 4,799   3,642      
Korea Electric Vehicle Charging Service            
Disclosure of transactions between related parties [line items]            
Electricity sales [3]     0   3,686  
Energy Infra Asset Management Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 89   89   0  
Service 2,631   2,701   2,779  
Outstanding balances for related party transactions [abstract]            
Non-trade payables and others 1          
Yaksu ESS Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity purchase 749   508   851  
Outstanding balances for related party transactions [abstract]            
Trade payables 923   538      
Gangwon Wind Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 1,736   2,464   1,549  
Electricity purchase 23,400   32,525   40,130  
Outstanding balances for related party transactions [abstract]            
Trade receivables 10   13      
Trade payables 4,023   3,206      
Bigeum Resident Photovoltaic Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 919   888   660  
Others 285   0   0  
Outstanding balances for related party transactions [abstract]            
Trade receivables 273   406      
Non-trade receivables and others 1,796   1,316      
Yanggu Floating Photovoltaic Power Plant Inc.            
Disclosure of transactions between related parties [line items]            
Electricity sales 6   0   0  
Electricity purchase 562   0   0  
Goesan Solar park Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity purchase 6,143   6,530   7,642  
Outstanding balances for related party transactions [abstract]            
Trade payables 0   56      
Gwangyang Green Energy Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 1,479   1,492   1,848  
Outstanding balances for related party transactions [abstract]            
Trade receivables 1,040   1,069      
Non-trade receivables and others 1,016   716      
Hyundai Green Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales and design service 6,659   6,668   7,063  
Outstanding balances for related party transactions [abstract]            
Trade receivables 893   903      
Korea Power Exchange            
Disclosure of transactions between related parties [line items]            
Service 78,346   52,262   16,596  
Service 90,549   82,572   93,817  
Outstanding balances for related party transactions [abstract]            
Trade receivables 2,434   1,583      
Trade payables 2,688   16,367      
Non-trade receivables and others     1      
Non-trade payables and others 1,571   2,520      
Taebaek Wind Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Service [4] 0   0   861  
Others [4] 41   2,864   0  
Service [4] 6,327   7,476   0  
Service and REC [4] 0   0   7,442  
Outstanding balances for related party transactions [abstract]            
Trade receivables     4      
Trade payables 691   603      
Non-trade payables and others 184   341      
Taebaek Guinemi Wind Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 26   0   0  
Electricity purchase 5,155   5,529   6,793  
Outstanding balances for related party transactions [abstract]            
Trade payables 840   572      
Non-trade payables and others 167   286      
Pyeongchang Wind Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 0   0   1,323  
Electricity purchase 3,079   3,542   0  
Design service and others 0   0   3,884  
Pyeongchang Wind Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 771   2,087   0  
Daeryun Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 3,628   3,187   2,016  
Electricity purchase 282,968   353,371   428,534  
Outstanding balances for related party transactions [abstract]            
Trade receivables     326      
Trade payables 35,392   32,140      
Changjuk Wind Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales [5] 0   0   1,350  
Electricity purchase [5] 0   0   9,027  
GS Donghae Electric Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 9,284   28,164   5,238  
Electricity purchase 519,119   1,047,584   1,035,263  
Outstanding balances for related party transactions [abstract]            
Trade receivables 22   159      
Trade payables 90,468   72,951      
Non-trade receivables and others 109   169      
Non-trade payables and others     125      
KNH Solar Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 1,635   15   13  
Electricity purchase 2,671   3,535   4,348  
Outstanding balances for related party transactions [abstract]            
Trade receivables     1      
Trade payables     19      
Non-trade payables and others     1      
S-Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Service 2,359   4,965   4,588  
Service 693,948   973,646   1,091,741  
Outstanding balances for related party transactions [abstract]            
Trade receivables 264   213      
Trade payables 73,377   79,459      
Non-trade receivables and others 54   53      
Non-trade payables and others 19          
Chuncheon Green Energy Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 11,010   82   2  
Electricity purchase 39,333   0   0  
Outstanding balances for related party transactions [abstract]            
Non-trade receivables and others 10,870          
Non-trade payables and others 8,881          
Yeongyang Wind Power Corporation II            
Disclosure of transactions between related parties [line items]            
Commission 150   150   0  
Commission 17,898   1,457   0  
Outstanding balances for related party transactions [abstract]            
Trade payables 3,978          
Non-trade receivables and others     165      
PND Solar Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 348   547   427  
Electricity purchase 5,231   5,301   6,173  
Outstanding balances for related party transactions [abstract]            
Trade payables 418   296      
Hyundai Eco Energy Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 833   1,236   277  
Electricity purchase 26,253   26,266   29,209  
Outstanding balances for related party transactions [abstract]            
Trade receivables 25   28      
Trade payables 647   408      
YeongGwang Yaksu Wind Electric Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 237   96   66  
Electricity purchase 7,415   6,776   7,382  
Outstanding balances for related party transactions [abstract]            
Trade receivables 7   10      
Trade payables 1,034   828      
Non-trade receivables and others 2,858   2,294      
Taebaek Gadeoksan Wind Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 2,464   3,998   1,952  
Electricity purchase 32,549   34,940   25,880  
Outstanding balances for related party transactions [abstract]            
Trade payables 9,249   12,739      
Non-trade receivables and others 62   1,539      
Non-trade payables and others 1   7      
Korea Energy Solutions Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 2   2   2  
Electricity purchase 132   128   102  
ITR Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Service 0   3   6  
STN Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Service 1   0   7  
Others 8   10   0  
Green Energy Electricity Generation Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity purchase 1,966   948   2,962  
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 [6] 0   31   21  
Electricity purchase [6] 0   0   9,491  
Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1            
Disclosure of transactions between related parties [line items]            
Service 360   405   394  
Bitgoel Eco Energy Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 3,377   1,581   1,397  
Service and others 32,413   28,334   930  
Outstanding balances for related party transactions [abstract]            
Trade payables 5,394   6,226      
Non-trade receivables and others 2   131      
Non-trade payables and others 1,458          
Jeju Gimnyeong Wind Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 458   315   367  
Electricity purchase 10,161   8,635   12,364  
Outstanding balances for related party transactions [abstract]            
Trade payables 2,152   1,467      
Non-trade receivables and others 143   112      
Non-trade payables and others 5   9      
Seoroseoro Sunny Power Plant Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 2   2   1  
REC and others 991   874   1,138  
Muan Solar park Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 1,797   3,083   950  
REC and others 17,825   16,554   17,052  
Outstanding balances for related party transactions [abstract]            
Non-trade receivables and others 4   4      
YuDang Solar Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 60   100   160  
REC and others 2,020   1,860   1,915  
Anjwa Smart Farm & Solar City Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 971   2,479   1,068  
Electricity purchase 19,494   17,332   16,942  
Outstanding balances for related party transactions [abstract]            
Non-trade payables and others 1,797   1,296      
KPE Green Energy Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 226   163   185  
Others 41,197   62,212   42,651  
Outstanding balances for related party transactions [abstract]            
Trade receivables 1   1      
Trade payables 5,521   5,485      
Non-trade receivables and others 130          
Saemangeum Heemang Photovoltaic Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 2,232   3,538   5,740  
Electricity purchase 2,745   440   1,039  
Outstanding balances for related party transactions [abstract]            
Non-trade receivables and others 1          
G.GURU Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity purchase 0   0   452  
UD4M Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 8   3   2  
Electricity purchase 0   117   313  
Dongbu Highway Solar Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 11   11   8  
Electricity purchase 2,951   2,937   3,516  
Outstanding balances for related party transactions [abstract]            
Trade receivables 1   1      
Trade payables 241          
Non-trade payables and others 1          
Seobu Highway Solar Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 13   12   8  
Electricity purchase 2,899   2,880   3,452  
Outstanding balances for related party transactions [abstract]            
Trade receivables 1   1      
Trade payables 231          
Non-trade payables and others 2          
Songsan Green Energy Co., Ltd            
Disclosure of transactions between related parties [line items]            
Interest income/ Dividends income 174   0   0  
Outstanding balances for related party transactions [abstract]            
Non-trade receivables and others 190          
REC's Innovation Co., Ltd. (formerly, Wang San Engineering. Co,. Ltd.)            
Disclosure of transactions between related parties [line items]            
Interest income/ Dividends income 23   6   0  
Dreams Co.,Ltd.            
Disclosure of transactions between related parties [line items]            
Others 30   0   0  
Outstanding balances for related party transactions [abstract]            
Non-trade receivables and others 1          
Non-trade payables and others 30          
DEEPAI Co.,Ltd.            
Disclosure of transactions between related parties [line items]            
Others 30   0   0  
Outstanding balances for related party transactions [abstract]            
Non-trade receivables and others 1          
Non-trade payables and others 30          
Green Radiation Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Ordinary development expense 45   11   0  
Outstanding balances for related party transactions [abstract]            
Non-trade payables and others 30          
Gwangbaek Solar Power Investment Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 523   644   0  
Electricity purchase 499   565   602  
Go deok Clean Energy Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 11,376   4,685   0  
Electricity purchase 35,055   11,545   0  
Outstanding balances for related party transactions [abstract]            
Non-trade receivables and others 10,118   4,562      
Non-trade payables and others 3,022   5,288      
Changwon SG Energy Co., Ltd            
Disclosure of transactions between related parties [line items]            
Electricity sales 9   0   0  
Electricity purchase 1,080   0   0  
SureDataLab Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 0   1   1  
Others 72   0   0  
Suwon New Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales (102)   91   118  
Outstanding balances for related party transactions [abstract]            
Trade receivables     876      
Non-trade receivables and others     560      
Non-trade payables and others 1   0      
Kosture Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 0   0   5  
PlatformN. Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Others 0   16   14  
Others 237   0   475  
Gangneung Sacheon Fuel Cell Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 8,343   133   151  
Electricity purchase 32,689   1,324   0  
Outstanding balances for related party transactions [abstract]            
Trade receivables 8,343          
Non-trade payables and others 3,201          
Muan Sunshine Solar Power Plant Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 630   403   17  
Electricity purchase 15,697   16,328   19,514  
Outstanding balances for related party transactions [abstract]            
Trade payables 1,954   1,440      
13 Associates (Overseas)            
Disclosure of transactions between related parties [line items]            
Electricity sales 243,651   386,191   548,507  
Electricity purchase 98,753   91,233   101,790  
Seobusambo highway photovoltaics Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 20   16   3  
Electricity purchase 825   502   103  
Outstanding balances for related party transactions [abstract]            
Trade receivables 1   1      
Non-trade receivables and others 4   4      
Naepo Green Energy Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 3,972   3,462   761  
Outstanding balances for related party transactions [abstract]            
Trade receivables 325   190      
Non-trade receivables and others 458   1      
Yangyang Suri Wind Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 202   169   0  
Outstanding balances for related party transactions [abstract]            
Non-trade receivables and others 55   55      
Cheongna Energy Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Others 38,349   32,835   39,802  
Service 60   60   80  
Outstanding balances for related party transactions [abstract]            
Trade receivables 7,033   13,898      
Non-trade receivables and others 3,229   2,160      
Non-trade payables and others 8   1      
Boim Combined Heat and Power Generation Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Service 2,073   2,110   7,761  
Service [7] 3,038   8,151   13,872  
Outstanding balances for related party transactions [abstract]            
Trade receivables 47   84      
Trade payables 445   721      
Non-trade receivables and others 3,208   10,779      
Non-trade payables and others 13,824   14,193      
Namyangju Combined Heat and Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Service 2,493   0   0  
Daegu Green Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 2,385   1,694   1,190  
Electricity purchase 328,485   370,787   508,601  
Outstanding balances for related party transactions [abstract]            
Trade receivables 182   122      
Trade payables 25,622   32,222      
Non-trade receivables and others 503   55      
Honam Wind Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 529   610   242  
Electricity purchase 7,148   8,643   7,662  
Outstanding balances for related party transactions [abstract]            
Trade payables 515   515      
KAPES, Inc.            
Disclosure of transactions between related parties [line items]            
Commission 1,531   1,604   450  
Commission 23,924   19,112   9,306  
Outstanding balances for related party transactions [abstract]            
Trade receivables 4   4      
Non-trade receivables and others 90,088   89      
Non-trade payables and others 3,041   3,791      
Korea Power Engineering Service Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Service 777   159   268  
Service 551   812   830  
Outstanding balances for related party transactions [abstract]            
Non-trade receivables and others 52   48      
Non-trade payables and others     76      
Seokmun Energy Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Service 1,774   1,792   1,685  
Service 51,924   60,009   60,799  
Outstanding balances for related party transactions [abstract]            
Trade receivables 35   44      
Trade payables 7,156   7,000      
Non-trade receivables and others 862   199      
Incheon New Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Construction revenue 26   458   14  
Outstanding balances for related party transactions [abstract]            
Trade receivables 9          
Chun-cheon Energy Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 968   2,976   2,505  
Electricity purchase 430,697   585,656   585,689  
Outstanding balances for related party transactions [abstract]            
Trade receivables     239      
Trade payables 35,325   79,117      
Non-trade receivables and others     165      
Non-trade payables and others     2      
Yeonggwangbaeksu Wind Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 2,031   1,962   1,898  
Electricity purchase 12,294   17,228   13,990  
Outstanding balances for related party transactions [abstract]            
Trade receivables 9   10      
Trade payables 962   1,076      
Non-trade receivables and others 178          
Samcheok Eco Materials Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity purchase [1] 3,282   0   0  
Yeonggwang Wind Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 943   3,607   871  
Electricity purchase 31,712   40,605   31,221  
Outstanding balances for related party transactions [abstract]            
Trade receivables 12   15      
Trade payables 4,591   2,251      
Non-trade receivables and others 58   56      
NH-Amundi Global Infrastructure Investment Private Investment Trust 21            
Disclosure of transactions between related parties [line items]            
Service 0   1,568   1,415  
Seungmun Green Energy            
Disclosure of transactions between related parties [line items]            
Electricity sales 79   0   0  
Electricity purchase 25,725   0   0  
Outstanding balances for related party transactions [abstract]            
Non-trade receivables and others 34          
KW Nuclear Components Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Service 1,645   1,612   1,624  
Service 6,880   14,114   9,504  
Outstanding balances for related party transactions [abstract]            
Non-trade receivables and others     17      
KEPCO-Uhde Inc.            
Disclosure of transactions between related parties [line items]            
Electricity sales [8] 0   0   12  
Busan Shinho Solar Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 699   1,205   502  
Electricity purchase 8,467   10,248   10,601  
Outstanding balances for related party transactions [abstract]            
Trade receivables 3   3      
Trade payables 915   304      
Expressway Solar-light Power Generation Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 0   43   0  
Electricity purchase 3,165   3,362   4,016  
Outstanding balances for related party transactions [abstract]            
Trade payables 432   220      
Goheung New Energy Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales [7] 3,106   3,214   141  
Electricity purchase | $   $ 10,133   $ 5,264   $ 0
Outstanding balances for related party transactions [abstract]            
Trade receivables 21          
Non-trade receivables and others 8          
Gunsan Land Solar Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 944   809   518  
Electricity purchase 2,752   486   533  
Outstanding balances for related party transactions [abstract]            
Non-trade receivables and others 217   295      
Daesan Green Energy Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 426   760   394  
Electricity purchase 154,623   139,721   129,736  
Outstanding balances for related party transactions [abstract]            
Trade receivables 4   13      
Trade payables 3,819   4,946      
Non-trade receivables and others 211   170      
Cheong-Song Noraesan Wind Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 38   901   698  
Electricity purchase 2,048   882   980  
Outstanding balances for related party transactions [abstract]            
Trade receivables     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   0   100  
Electricity purchase 0   0   1  
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 42   40   32  
Electricity purchase 3,645   5,583   5,696  
Outstanding balances for related party transactions [abstract]            
Trade receivables 4   4      
Trade payables 282   222      
Non-trade payables and others 181   176      
Yangyang Wind Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 238   13   0  
Service and Electricity Sales 3,599   10   0  
Outstanding balances for related party transactions [abstract]            
Non-trade receivables and others 163   13      
Energyco Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 161   457   463  
Electricity purchase 5,788   6,539   7,898  
Outstanding balances for related party transactions [abstract]            
Trade payables 432   99      
Non-trade receivables and others 124   3      
Hapcheon Floating Photovoltaic Power Plant Inc.            
Disclosure of transactions between related parties [line items]            
Electricity sales 905   88   544  
Service and REC 4,759   0   2,526  
Outstanding balances for related party transactions [abstract]            
Trade receivables 12   10      
Non-trade receivables and others 59   68      
Busan Industrial Solar Power Co., Ltd.            
Outstanding balances for related party transactions [abstract]            
Trade receivables 2   2      
Trade payables 240          
Omisan Wind Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 279   26   1  
Electricity purchase 638   0   0  
Outstanding balances for related party transactions [abstract]            
Non-trade receivables and others 146          
Busan Industrial Solar Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 23   22   14  
Electricity purchase 2,493   3,656   4,575  
Bitsolar Energy Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 464   357   498  
Electricity purchase 9,072   12,946   13,030  
Outstanding balances for related party transactions [abstract]            
Trade receivables 12          
Trade payables 207   201      
Non-trade receivables and others 444   1      
Changwon Nu-ri Energy Co., Ltd            
Disclosure of transactions between related parties [line items]            
Service 171   0   0  
Outstanding balances for related party transactions [abstract]            
Non-trade receivables and others 188          
Jeonju Bio Green Energy Co., Ltd            
Disclosure of transactions between related parties [line items]            
Service 170   0   0  
Outstanding balances for related party transactions [abstract]            
Non-trade receivables and others 187          
Haemodum Solar Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 39   431   42  
Electricity purchase 544   402   2,168  
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 545   1,131   379  
Electricity purchase 24,004   34,981   44,745  
Outstanding balances for related party transactions [abstract]            
Trade receivables 48   56      
Trade payables 5,723   3,517      
Yeongwol Eco Wind Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 0   102   0  
Electricity purchase 2,496   0   0  
Samsu Wind Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 301   514   0  
Electricity purchase 6,864   8,269   10,605  
Outstanding balances for related party transactions [abstract]            
Trade payables 1,834   1,229      
Cheongju Eco Park Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 316   6,397   204  
Electricity purchase 34,601   95,059   94,409  
Outstanding balances for related party transactions [abstract]            
Trade receivables     6,899      
Trade payables 9,105   7,994      
Non-trade receivables and others 13,461          
Non-trade payables and others 2,853          
Solaseado Solar Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 1,870   1,876   1,851  
Electricity purchase [7] 24,899   18,259   28,698  
Outstanding balances for related party transactions [abstract]            
Non-trade receivables and others 15   24      
Shin-han BNPP Private Investment Trust for East-West Sunlight Dream            
Disclosure of transactions between related parties [line items]            
Dividends income 87   0   0  
Gurae Resident Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 0   8   0  
Electricity purchase 476   1   0  
Enel X Midland Photovoltaic, LLC            
Disclosure of transactions between related parties [line items]            
Electricity sales 11   11   12  
Electricity purchase 3,200   2,431   1,871  
Outstanding balances for related party transactions [abstract]            
Trade receivables 1   1      
Trade payables 204   144      
Non-trade payables and others 59   49      
Eumseong Eco Park Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 19   19   2  
Electricity purchase 26,372   27,765   0  
Geumsungsan Wind Power Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Electricity sales 58   68   7  
Outstanding balances for related party transactions [abstract]            
Trade receivables 3   4      
43 Joint ventures (Overseas)            
Disclosure of transactions between related parties [line items]            
Electricity sales 518,941   747,301   606,513  
Electricity purchase 14,796   17,222   16,859  
Korea Development Bank            
Disclosure of transactions between related parties [line items]            
Electricity sales 4,368   5,467   4,134  
Dividends paid 0   0   12  
Interest income 10,324   5,930   2,222  
Interest expense 7,839   5,559   4,208  
Outstanding balances for related party transactions [abstract]            
Non-trade receivables and others 34,138   33,140      
Non-trade payables and others 231   147      
Derivative assets 273,627   45,898      
Derivative liabilities 2,421   72,050      
9 Associates (Overseas)            
Outstanding balances for related party transactions [abstract]            
Trade receivables 59,651   77,814      
Non-trade payables and others     6,242      
Global Trade Of Power System Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Service 511   223   ₩ 715  
Outstanding balances for related party transactions [abstract]            
Non-trade payables and others 7          
Development Co., Ltd            
Outstanding balances for related party transactions [abstract]            
Trade payables 1,291   2,021      
Non-trade payables and others 8,832   8,077      
27 Joint ventures (Overseas)            
Outstanding balances for related party transactions [abstract]            
Trade receivables 271,219   160,474      
Non-trade receivables and others 59,839   55,897      
Non-trade payables and others ₩ 34,932   ₩ 22,877      
[1] Samcheok Eco Materials Co., Ltd. was reclassified from an associate to a joint venture for the year ended December 31, 2024.
[2] YTN Co., Ltd. is not a related party of the Company as of December 31, 2024, as the sale of shares was completed for the year ended December 31, 2024.
[3] Korea Electric Vehicle Charging Service is not a related party of the Company as of December 31, 2022 as the sale of shares was completed for the year ended December 31, 2022.
[4] Taebaek Wind Power Co., Ltd. was changed from an associate to a joint venture for the year ended December 31, 2023.
[5] 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.
[6] Namjeongsusang Solar Power Operation Co., Ltd. is not a related party of the Company as of December 31, 2024, as the sale of shares was completed for the year ended December 31, 2023.
[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.