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Cover Page
 12 Months Ended
Dec. 31, 2021
shares
Document Information [Line Items]  
Entity Registrant Name KOREA ELECTRIC POWER CORPORATION
Entity Central Index Key 0000887225
Document Type 20-F
Document Period End Date Dec. 31, 2021
Amendment Flag false
Document Fiscal Year Focus 2021
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
ICFR Auditor Attestation Flag true
Entity File Number 001-13372
Entity Incorporation, State or Country Code M5
Entity Address, Address Line One 55 Jeollyeok-ro
Entity Address, City or Town Naju-si
Entity Address, Country KR
Entity Address, Postal Zip Code 58322
Document Accounting Standard International Financial Reporting Standards
Auditor Name Ernst & Young Han Young
Auditor Firm ID 1437
Auditor Location Seoul, the Republic of Korea
Business Contact [Member]  
Document Information [Line Items]  
Entity Address, Address Line One 55 Jeollyeok-ro
Entity Address, City or Town Naju-si
Entity Address, Country KR
Entity Address, Postal Zip Code 58322
Contact Personnel Name Yoonjue Lee
City Area Code 61
Local Phone Number 345 4213
Contact Personnel Email Address yoonjue.lee@kepco.co.kr
Common Stock  
Document Information [Line Items]  
Trading Symbol KEP
Title of 12(b) Security Common stock, par value Won 5,000 per share
Security Exchange Name NYSE [1]
ADS  
Document Information [Line Items]  
Trading Symbol KEP
Title of 12(b) Security American depositary shares, each representing one-half of share of common stock
Security Exchange Name NYSE
[1] Not for trading, but only in connection with the listing of American depositary shares on the New York Stock Exchange, pursuant to the requirements of the Securities and Exchange Commission.