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Document And Entity Information
 12 Months Ended
Dec. 31, 2019
shares
Document and entity information [Abstract]  
Entity Registrant Name KOREA ELECTRIC POWER CORP
Trading Symbol KEP
Entity Central Index Key 0000887225
Document Type 20-F
Document Period End Date Dec. 31, 2019
Amendment Flag false
Document Fiscal Year Focus 2019
Document Fiscal Period Focus FY
Current Fiscal Year End Date --12-31
Entity Well-known Seasoned Issuer Yes
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Filer Category Large Accelerated Filer
Entity Emerging Growth Company false
Entity Shell Company false
Entity Common Stock, Shares Outstanding 641,964,077
Entity Interactive Data Current Yes
Document Annual Report true
Document Transition Report false
Document Shell Company Report false
Document Registration Statement false
Security 12b Title American Depositary Shares
Security Exchange Name NYSE