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Consolidated Subsidiaries - Summary of Consolidated Subsidiaries (Details) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Korea Hydro & Nuclear Power Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Power generation | Power generation
Location |  | Korea | Korea
Proportion of ownership (%) |  | 100.00% | 100.00%
Korea South-East Power Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Power generation | Power generation
Location |  | Korea | Korea
Proportion of ownership (%) |  | 100.00% | 100.00%
Korea Midland Power Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Power generation | Power generation
Location |  | Korea | Korea
Proportion of ownership (%) |  | 100.00% | 100.00%
Korea Western Power Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Power generation | Power generation
Location |  | Korea | Korea
Proportion of ownership (%) |  | 100.00% | 100.00%
Korea Southern Power Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Power generation | Power generation
Location |  | Korea | Korea
Proportion of ownership (%) |  | 100.00% | 100.00%
Korea East-West Power Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Power generation | Power generation
Location |  | Korea | Korea
Proportion of ownership (%) |  | 100.00% | 100.00%
KEPCO Engineering & Construction Company, Inc. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities | [1] | Engineering and construction for utility plant and others | Engineering and construction for utility plant and others
Location | [1] | Korea | Korea
Proportion of ownership (%) | [1] | 65.77% | 65.77%
KEPCO Plant Service & Engineering Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Utility plant maintenance and others | Utility plant maintenance and others
Location |  | Korea | Korea
Proportion of ownership (%) |  | 51.00% | 51.00%
KEPCO Nuclear Fuel Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Nuclear fuel | Nuclear fuel
Location |  | Korea | Korea
Proportion of ownership (%) |  | 96.36% | 96.36%
KEPCO KDN Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Electric power information technology and others | Electric power information technology and others
Location |  | Korea | Korea
Proportion of ownership (%) |  | 100.00% | 100.00%
KEPCO International HongKong Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | Hong Kong | Hong Kong
Proportion of ownership (%) |  | 100.00% | 100.00%
KEPCO International Philippines Inc. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | Philippines | Philippines
Proportion of ownership (%) |  | 100.00% | 100.00%
KEPCO Gansu International Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | Hong Kong | Hong Kong
Proportion of ownership (%) |  | 100.00% | 100.00%
KEPCO Philippines Holdings Inc. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities | [2] | Holding company | Holding company
Location | [2] | Philippines | Philippines
Proportion of ownership (%) | [2] | 100.00% | 100.00%
KEPCO Philippines Corporation |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Operation of utility plant | Operation of utility plant
Location |  | Philippines | Philippines
Proportion of ownership (%) |  | 100.00% | 100.00%
KEPCO Ilijan Corporation |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Construction and operation of utility plant | Construction and operation of utility plant
Location |  | Philippines | Philippines
Proportion of ownership (%) |  | 51.00% | 51.00%
KEPCO Lebanon SARL |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Operation of utility plant | Operation of utility plant
Location |  | Lebanon | Lebanon
Proportion of ownership (%) |  | 100.00% | 100.00%
KEPCO Neimenggu International Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | Hong Kong | Hong Kong
Proportion of ownership (%) |  | 100.00% | 100.00%
KEPCO Shanxi International Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | Hong Kong | Hong Kong
Proportion of ownership (%) |  | 100.00% | 100.00%
KOMIPO Global Pte Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | Singapore | Singapore
Proportion of ownership (%) |  | 100.00% | 100.00%
KEPCO Netherlands B.V. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | Netherlands | Netherlands
Proportion of ownership (%) |  | 100.00% | 100.00%
KEPCO Australia Pty., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Resources development | Resources development
Location |  | Australia | Australia
Proportion of ownership (%) |  | 100.00% | 100.00%
KOSEP Australia Pty., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Resources development | Resources development
Location |  | Australia | Australia
Proportion of ownership (%) |  | 100.00% | 100.00%
KOMIPO Australia Pty., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Resources development | Resources development
Location |  | Australia | Australia
Proportion of ownership (%) |  | 100.00% | 100.00%
KOWEPO Australia Pty., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Resources development | Resources development
Location |  | Australia | Australia
Proportion of ownership (%) |  | 100.00% | 100.00%
KOSPO Australia Pty., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Resources development | Resources development
Location |  | Australia | Australia
Proportion of ownership (%) |  | 100.00% | 100.00%
KEPCO Middle East Holding Company |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | Bahrain | Bahrain
Proportion of ownership (%) |  | 100.00% | 100.00%
Qatrana Electric Power Company |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Construction and operation of utility plant | Construction and operation of utility plant
Location |  | Jordan | Jordan
Proportion of ownership (%) |  | 80.00% | 80.00%
KHNP Canada Energy Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | Canada | Canada
Proportion of ownership (%) |  | 100.00% | 100.00%
KEPCO Bylong Australia Pty., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Resources development | Resources development
Location |  | Australia | Australia
Proportion of ownership (%) |  | 100.00% | 100.00%
Korea Waterbury Uranium Limited Partnership |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Resources development | Resources development
Location |  | Canada | Canada
Proportion of ownership (%) |  | 80.00% | 80.00%
KEPCO Holdings de Mexico |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | Mexico | Mexico
Proportion of ownership (%) |  | 100.00% | 100.00%
KST Electric Power Company, S.A.P.I. de C.V. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Construction and operation of utility plant | Construction and operation of utility plant
Location |  | Mexico | Mexico
Proportion of ownership (%) |  | 56.00% | 56.00%
KEPCO Energy Service Company |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Operation of utility plant | Operation of utility plant
Location |  | Mexico | Mexico
Proportion of ownership (%) |  | 100.00% | 100.00%
KEPCO Netherlands S3 B.V. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | Netherlands | Netherlands
Proportion of ownership (%) |  | 100.00% | 100.00%
PT. KOMIPO Pembangkitan Jawa Bali |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Operation of utility plant | Operation of utility plant
Location |  | Indonesia | Indonesia
Proportion of ownership (%) |  | 51.00% | 51.00%
PT. Cirebon Power Service |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities | [3] | Operation of utility plant | Operation of utility plant
Location | [3] | Indonesia | Indonesia
Proportion of ownership (%) | [3] | 27.50% | 27.50%
KOWEPO International Corporation |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Operation of utility plant | Operation of utility plant
Location |  | Philippines | Philippines
Proportion of ownership (%) |  | 99.99% | 99.99%
KOSPO Jordan LLC |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Operation of utility plant | Operation of utility plant
Location |  | Jordan | Jordan
Proportion of ownership (%) |  | 100.00% | 100.00%
EWP America Inc. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | USA | USA
Proportion of ownership (%) |  | 100.00% | 100.00%
EWP Renewable Corporation |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | USA | USA
Proportion of ownership (%) |  | 100.00% | 100.00%
KNF Canada Energy Limited |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | Canada | Canada
Proportion of ownership (%) |  | 100.00% | 100.00%
EWP Barbados 1 SRL |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | Barbados | Barbados
Proportion of ownership (%) |  | 100.00% | 100.00%
California Power Holdings, LLC |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Power generation | Power generation
Location |  | USA | USA
Proportion of ownership (%) |  | 100.00% | 100.00%
Gyeonggi Green Energy Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Power generation | Power generation
Location |  | Korea | Korea
Proportion of ownership (%) |  | 62.01% | 62.01%
PT. Tanggamus Electric Power |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Power generation | Power generation
Location |  | Indonesia | Indonesia
Proportion of ownership (%) |  | 52.50% | 52.50%
Gyeongju Wind Power Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Power generation | Power generation
Location |  | Korea | Korea
Proportion of ownership (%) |  | 70.00% | 70.00%
KOMIPO America Inc. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | USA | USA
Proportion of ownership (%) |  | 100.00% | 100.00%
EWPRC Biomass Holdings, LLC |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | USA | USA
Proportion of ownership (%) |  | 0.00% | 100.00%
Reason |  | Liquidation |
PT. EWP Indonesia |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | Indonesia | Indonesia
Proportion of ownership (%) |  | 99.96% | 99.96%
KEPCO Netherlands J3 B.V. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | Netherlands | Netherlands
Proportion of ownership (%) |  | 100.00% | 100.00%
Korea Offshore Wind Power Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Power generation | Power generation
Location |  | Korea | Korea
Proportion of ownership (%) |  | 100.00% | 100.00%
Global One Pioneer B.V. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | Netherlands | Netherlands
Proportion of ownership (%) |  | 100.00% | 100.00%
Global Energy Pioneer B.V. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | Netherlands | Netherlands
Proportion of ownership (%) |  | 100.00% | 100.00%
Mira Power Limited |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities | [4] | Power generation | Power generation
Location | [4] | Pakistan | Pakistan
Proportion of ownership (%) | [4] | 76.00% | 76.00%
KOSEP Material Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Recycling fly ashes | Recycling fly ashes
Location |  | Korea | Korea
Proportion of ownership (%) |  | 86.22% | 86.22%
Commerce and Industry Energy Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities | [5] | RDF power generation | RDF power generation
Location | [5] | Korea | Korea
Proportion of ownership (%) | [5] | 85.03% | 85.03%
KEPCO KPS Philippines Corp. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Utility plant maintenance and others | Utility plant maintenance and others
Location |  | Philippines | Philippines
Proportion of ownership (%) |  | 99.99% | 99.99%
KOSPO Chile SpA |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | Chile | Chile
Proportion of ownership (%) |  | 100.00% | 100.00%
PT. KOWEPO Sumsel Operation and Maintenance Services |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Utility plant maintenance and others | Utility plant maintenance and others
Location |  | Indonesia | Indonesia
Proportion of ownership (%) |  | 95.00% | 95.00%
Hee Mang Sunlight Power Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Operation of utility plant | Operation of utility plant
Location |  | Korea | Korea
Proportion of ownership (%) |  | 100.00% | 100.00%
Fujeij Wind Power Company |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Operation of utility plant | Operation of utility plant
Location |  | Jordan | Jordan
Proportion of ownership (%) |  | 100.00% | 100.00%
KOSPO Youngnam Power Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities | [6] | Operation of utility plant | Operation of utility plant
Location | [6] | Korea | Korea
Proportion of ownership (%) | [6] | 50.00% | 50.00%
Chitose Solar Power Plant LLC |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Power generation | Power generation
Location |  | Japan | Japan
Proportion of ownership (%) |  | 65.00% | 65.00%
KEPCO Energy Solution Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Energy service | Energy service
Location |  | Korea | Korea
Proportion of ownership (%) |  | 100.00% | 100.00%
KEPCO Solar Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Power generation | Power generation
Location |  | Korea | Korea
Proportion of ownership (%) |  | 100.00% | 100.00%
KOSPO Power Services Ltda. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Utility plant maintenance and others | Utility plant maintenance and others
Location |  | Chile | Chile
Proportion of ownership (%) |  | 65.00% | 65.00%
Energy New Industry Specialized Investment Private Investment Trust |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | Korea | Korea
Proportion of ownership (%) |  | 99.01% | 99.01%
KOEN Bylong Pty., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Resources development | Resources development
Location |  | Australia | Australia
Proportion of ownership (%) |  | 100.00% | 100.00%
KOMIPO Bylong Pty., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Resources development | Resources development
Location |  | Australia | Australia
Proportion of ownership (%) |  | 100.00% | 100.00%
KOWEPO Bylong Pty., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Resources development | Resources development
Location |  | Australia | Australia
Proportion of ownership (%) |  | 100.00% | 100.00%
KOSPO Bylong Pty., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Resources development | Resources development
Location |  | Australia | Australia
Proportion of ownership (%) |  | 100.00% | 100.00%
EWP Bylong Pty., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Resources development | Resources development
Location |  | Australia | Australia
Proportion of ownership (%) |  | 100.00% | 100.00%
KOWEPO Lao International |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Utility plant maintenance and others | Utility plant maintenance and others
Location |  | Laos | Laos
Proportion of ownership (%) |  | 100.00% | 100.00%
KEPCO US Inc. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | USA | USA
Proportion of ownership (%) |  | 100.00% | 100.00%
KEPCO Alamosa LLC |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | USA | USA
Proportion of ownership (%) |  | 0.00% | 50.10%
Reason |  | Liquidation |
KEPCO Solar of Alamosa LLC |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Power generation | Power generation
Location |  | USA | USA
Proportion of ownership (%) |  | 0.00% | 100.00%
Reason |  | Disposal |
KEPCO Mangilao Holdings LLC |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | USA | USA
Proportion of ownership (%) |  | 100.00% | 100.00%
Mangilao Investment LLC |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | USA | USA
Proportion of ownership (%) |  | 80.06% | 100.00%
KEPCO Mangilao Solar, LLC |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Power generation | Power generation
Location |  | USA | USA
Proportion of ownership (%) |  | 100.00% | 100.00%
Jeju Hanlim Offshore Wind Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Power generation | Power generation
Location |  | Korea | Korea
Proportion of ownership (%) |  | 79.03% | 79.03%
PT. Siborpa Eco Power |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Construction and operation of utility plant | Construction and operation of utility plant
Location |  | Indonesia | Indonesia
Proportion of ownership (%) |  | 55.00% | 55.00%
BSK E-New Industry Fund VII |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | Korea | Korea
Proportion of ownership (%) |  | 81.67% | 81.67%
e-New Industry LB Fund 1 |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | Korea | Korea
Proportion of ownership (%) |  | 76.11% | 76.11%
Songhyun e-New Industry Fund |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | Korea | Korea
Proportion of ownership (%) |  | 80.65% | 80.65%
BSK E-New Industry Fund X |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | Korea | Korea
Proportion of ownership (%) |  | 66.80% | 66.80%
PT. Korea Energy Indonesia |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Utility plant maintenance and others | Utility plant maintenance and others
Location |  | Indonesia | Indonesia
Proportion of ownership (%) |  | 95.00% | 95.00%
KOLAT SpA |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Utility plant maintenance and others | Utility plant maintenance and others
Location |  | Chile | Chile
Proportion of ownership (%) |  | 100.00% | 100.00%
KEPCO California, LLC |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | USA | USA
Proportion of ownership (%) |  | 100.00% | 100.00%
KEPCO Mojave Holdings, LLC |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | USA | USA
Proportion of ownership (%) |  | 100.00% | 100.00%
Incheon Fuel Cell Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Power generation | Power generation
Location |  | Korea | Korea
Proportion of ownership (%) |  | 60.00% | 60.00%
KOEN Service Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Facility maintenance and service | Facility maintenance and service
Location |  | Korea | Korea
Proportion of ownership (%) |  | 100.00% | 100.00%
KOMIPO Service Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Facility maintenance and service | Facility maintenance and service
Location |  | Korea | Korea
Proportion of ownership (%) |  | 100.00% | 100.00%
KOWEPO Service Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Facility maintenance and service | Facility maintenance and service
Location |  | Korea | Korea
Proportion of ownership (%) |  | 100.00% | 100.00%
KOSPO Service Co., Ltd |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Facility maintenance and service | Facility maintenance and service
Location |  | Korea | Korea
Proportion of ownership (%) |  | 100.00% | 100.00%
EWP Service Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Facility maintenance and service | Facility maintenance and service
Location |  | Korea | Korea
Proportion of ownership (%) |  | 100.00% | 100.00%
PT. KOMIPO Energy Indonesia |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Utility plant maintenance and others | Utility plant maintenance and others
Location |  | Indonesia | Indonesia
Proportion of ownership (%) |  | 95.00% | 95.00%
KNF Partners Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Facility maintenance and service | Facility maintenance and service
Location |  | Korea | Korea
Proportion of ownership (%) |  | 100.00% | 100.00%
KOSPO USA Inc. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | USA | USA
Proportion of ownership (%) |  | 100.00% | 100.00%
Nambu USA LLC |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | USA | USA
Proportion of ownership (%) |  | 100.00% | 100.00%
Tamra Offshore Wind Power Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Power generation | Power generation
Location |  | Korea | Korea
Proportion of ownership (%) |  | 63.00% | 63.00%
KEPCO MCS Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Electric meter reading and others | Electric meter reading and others
Location |  | Korea | Korea
Proportion of ownership (%) |  | 100.00% | 100.00%
KEPCO FMS Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Security service and others | Security service and others
Location |  | Korea | Korea
Proportion of ownership (%) |  | 100.00% | 100.00%
Firstkeepers Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Facility maintenance and service | Facility maintenance and service
Location |  | Korea | Korea
Proportion of ownership (%) |  | 100.00% | 100.00%
Secutec Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Security service | Security service
Location |  | Korea | Korea
Proportion of ownership (%) |  | 100.00% | 100.00%
SE Green Energy Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Power generation | Power generation
Location |  | Korea | Korea
Proportion of ownership (%) |  | 84.80% | 84.80%
KEPCO Mangilao America LLC |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | USA | USA
Proportion of ownership (%) |  | 0.00% | 100.00%
Reason |  | Liquidation |
Mangilao Intermediate Holdings LLC |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | USA | USA
Proportion of ownership (%) |  | 100.00% | 100.00%
KEPCO CSC Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Facility maintenance and service | Facility maintenance and service
Location |  | Korea | Korea
Proportion of ownership (%) |  | 100.00% | 100.00%
KOAK Power Limited |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Hydro power facility maintenance | Hydro power facility maintenance
Location |  | Pakistan | Pakistan
Proportion of ownership (%) |  | 100.00% | 100.00%
KOMIPO Europe B.V. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | Netherlands | Netherlands
Proportion of ownership (%) |  | 100.00% | 100.00%
Haenanum Energy Fund |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | Korea | Korea
Proportion of ownership (%) |  | 99.64% | 99.64%
Paju Ecoenergy Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Power generation | Power generation
Location |  | Korea | Korea
Proportion of ownership (%) |  | 89.00% | 89.00%
Guam Ukudu Power LLC |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Power generation | Power generation
Location |  | USA | USA
Proportion of ownership (%) |  | 100.00% | 100.00%
K-SOLAR SHINAN Co., Ltd. (formerly, TS Energy No. 25 Co., Ltd.) |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Power generation | Power generation
Location |  | Korea | Korea
Proportion of ownership (%) |  | 90.00% | 90.00%
KPS Partners Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Facility maintenance and service | Facility maintenance and service
Location |  | Korea | Korea
Proportion of ownership (%) |  | 100.00% | 100.00%
KEPCO E&C Service Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Facility maintenance and service | Facility maintenance and service
Location |  | Korea | Korea
Proportion of ownership (%) |  | 100.00% | 100.00%
Moha Solar Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Power generation | Power generation
Location |  | Korea | Korea
Proportion of ownership (%) |  | 100.00% | 100.00%
Ogiri Solar Power Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Power generation | Power generation
Location |  | Korea | Korea
Proportion of ownership (%) |  | 70.00% | 70.00%
KHNP USA LLC |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | USA | USA
Proportion of ownership (%) |  | 100.00% | 100.00%
KOMIPO Vanphong Power Service LLC |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Utility plant maintenance and others | Utility plant maintenance and others
Location |  | Vietnam | Vietnam
Proportion of ownership (%) |  | 100.00% | 100.00%
Energy Innovation Fund I |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | Korea | Korea
Proportion of ownership (%) |  | 71.91% | 71.91%
KHNP Chile SpA |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | Chile | Chile
Proportion of ownership (%) |  | 100.00% | 100.00%
Yeong Yang Apollon Photovoltaic Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Power generation | Power generation
Location |  | Korea | Korea
Proportion of ownership (%) |  | 100.00% | 100.00%
Yeong Yang Corporation Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Power generation | Power generation
Location |  | Korea | Korea
Proportion of ownership (%) |  | 100.00% | 100.00%
SolarVader Co., Ltd |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Power generation | Power generation
Location |  | Korea | Korea
Proportion of ownership (%) |  | 100.00% | 100.00%
Yeong Yang Innovation Co., Ltd |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Power generation | Power generation
Location |  | Korea | Korea
Proportion of ownership (%) |  | 100.00% | 100.00%
Yeong Yang Horus Photovoltaic Co., Ltd |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Power generation | Power generation
Location |  | Korea | Korea
Proportion of ownership (%) |  | 100.00% | 100.00%
Yeong Yang Solar Management Co., Ltd |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Power generation | Power generation
Location |  | Korea | Korea
Proportion of ownership (%) |  | 100.00% | 100.00%
LSG Hydro Power Limited |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | Pakistan | Pakistan
Proportion of ownership (%) |  | 99.80% | 99.80%
KOEN Bio Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Wood pellet utilization business | Wood pellet utilization business
Location |  | Korea | Korea
Proportion of ownership (%) |  | 70.00% | 70.00%
KOMIPO Energy Solution America, LLC |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | USA | USA
Proportion of ownership (%) |  | 100.00% | 100.00%
Elara Investment Holdings, LLC |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities | [7] | Holding company | Holding company
Location | [7] | USA | USA
Proportion of ownership (%) | [7] | 0.10% | 0.10%
Elara Equity Holdings, LLC |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | USA | USA
Proportion of ownership (%) |  | 54.00% | 54.00%
Elara Class B Holdings, LLC |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | USA | USA
Proportion of ownership (%) |  | 100.00% | 100.00%
Elara Class B Member, LLC |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | USA | USA
Proportion of ownership (%) |  | 100.00% | 100.00%
Elara Development Holdings, LLC |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | USA | USA
Proportion of ownership (%) |  | 100.00% | 100.00%
KOMIPO Development, LLC (formerly, Elara Development, LLC) |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | USA | USA
Proportion of ownership (%) |  | 100.00% | 100.00%
Elara Energy Holdings, LLC |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities | [7] | Holding company | Holding company
Location | [7] | USA | USA
Proportion of ownership (%) | [7] | 43.94% | 43.94%
Elara Energy Project, LLC |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Power generation | Power generation
Location |  | USA | USA
Proportion of ownership (%) |  | 100.00% | 100.00%
KOMIPO Iberian Solar Group, S.L.U. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | Spain | Spain
Proportion of ownership (%) |  | 100.00% | 100.00%
Jeongam Wind Power Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Power generation | Power generation
Location |  | Korea | Korea
Proportion of ownership (%) |  | 80.00% | 80.00%
KOWEPO Europe B.V. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | Netherlands | Netherlands
Proportion of ownership (%) |  | 100.00% | 100.00%
CVS Equity Holdings, LLC |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | USA | USA
Proportion of ownership (%) |  | 81.34% | 100.00%
CVS Class B Holdings, LLC |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | USA | USA
Proportion of ownership (%) |  | 100.00% | 100.00%
CVS Development Holdings, LLC |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | USA | USA
Proportion of ownership (%) |  | 100.00% | 100.00%
CVS Development, LLC |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | USA | USA
Proportion of ownership (%) |  | 100.00% | 100.00%
CVS Class B Member, LLC |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | USA | USA
Proportion of ownership (%) |  | 100.00% | 100.00%
CVS Energy Holdings, LLC |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | USA | USA
Proportion of ownership (%) |  | 70.79% | 100.00%
Concho Valley Energy, LLC |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | USA | USA
Proportion of ownership (%) |  | 100.00% | 100.00%
Concho Valley Solar, LLC |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Power generation | Power generation
Location |  | USA | USA
Proportion of ownership (%) |  | 100.00% | 100.00%
Yeongdeok Sunrise Wind Power Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Power generation | Power generation
Location |  | Korea | Korea
Proportion of ownership (%) |  | 70.00% | 70.00%
KHNP Spain, S.L. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | Spain | Spain
Proportion of ownership (%) |  | 100.00% | 100.00%
UI Carbon-Neutrality Fund |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | Korea | Korea
Proportion of ownership (%) |  | 78.97% | 0.00%
Reason |  | Newly established |
KA Power Limited |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Power generation | Power generation
Location |  | Pakistan | Pakistan
Proportion of ownership (%) |  | 100.00% | 0.00%
Reason |  | Newly established |
Western Power Changgi Solar Co., Ltd. (formerly, Sam-Yang Photovoltaic Power Co., Ltd.) |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities | [8] | Power generation | Power generation
Location | [8] | Korea | Korea
Proportion of ownership (%) | [8] | 100.00% | 0.00%
Reason |  | Change in the scope of consolidation |
EWP Australia Pty., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | Australia | Australia
Proportion of ownership (%) |  | 100.00% | 0.00%
Reason |  | Newly established |
Columboola Solar Farm Hold Co Pty., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities | [9] | Power generation | Power generation
Location | [9] | Australia | Australia
Proportion of ownership (%) | [9] | 74.04% | 0.00%
Reason |  | New investment |
Digital Innovation Growth Fund |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities | [10] | Holding company | Holding company
Location | [10] | Korea | Korea
Proportion of ownership (%) | [10] | 76.92% | 0.00%
Reason |  | Change in the scope of consolidation |
J Wind First, LLC |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities | [11] | Company specializing in liquidization | Company specializing in liquidization
Location | [11] | Korea | Korea
Proportion of ownership (%) | [11] | 0.00% | 0.00%
Reason |  | Newly established |
KEPCO Holding Company |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | Saudi Arabia | Saudi Arabia
Proportion of ownership (%) |  | 100.00% | 0.00%
Reason |  | Newly established |
KEPCO for Power Company |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Power generation | Power generation
Location |  | Saudi Arabia | Saudi Arabia
Proportion of ownership (%) |  | 60.00% | 0.00%
Reason |  | Newly established |
KEPCO for Maintenance Company |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Utility plant maintenance and others | Utility plant maintenance and others
Location |  | Saudi Arabia | Saudi Arabia
Proportion of ownership (%) |  | 100.00% | 0.00%
Reason |  | Newly established |
KOSPO Trumbull LLC |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities |  | Holding company | Holding company
Location |  | USA | USA
Proportion of ownership (%) |  | 100.00% | 0.00%
Reason |  | Newly established |
Changjuk Wind Power Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Key operation activities | [10] | Power generation | Power generation
Location | [10] | Korea | Korea
Proportion of ownership (%) | [10] | 73.00% | 0.00%
Reason |  | Change in the scope of consolidation |
Seobusambo highway photovoltaics Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Reason |  | Newly established |
Seobusambo highway photovoltaics Co., Ltd. |  |  |
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items] |  |  |
Reason |  | Change in the scope of consolidation |
[1] | Considering treasury stocks, the effective percentage of ownership is 66.08%. The Company is planning to sell part of its shares (14.77%) based on the resolution of the board of directors on June 24, 2022.
[2] | The Company is planning to sell its investment in KEPCO Philippines Holdings Inc., but time or proceeds of sales are not specified as of December 31, 2022.
[3] | The effective percentage of ownership is less than 50%. However, this subsidiary is included in the consolidated financial statements as the Company obtained the majority of the voting power under the shareholders’ agreement.
[4] | As of the reporting date, the annual reporting period of all subsidiaries is December 31, except for Mira Power Limited.
[5] | The Company guarantees a certain return on investment related to Commerce and Industry Energy Co., Ltd. for the financial investors. The financial investors have a right to sell their shares to the Company which can be exercised 36 months after the date of investment. Accordingly, the purchase price including the return on investment is classified as a liability.
[6] | The subsidiary is included in the consolidated financial statements as the Company owns 50%+1 stake and has the ability to appoint a majority of the board members under the shareholders’ agreement.
[7] | The effective percentage of ownership is less than 50%. However, this subsidiary is included in the consolidated financial statements as the Company has control over the board of directors under the shareholders’ agreement.
[8] | For the year ended December 31, 2022, the Company included Western Power Changgi Solar Co., Ltd. as a subsidiary, considering that it acquired control over the entity after the entity undertook selective reduction of capital.
[9] | Excluding preferred stocks, the percentage of ownership with voting rights is 100%.
[10] | The entity was transferred from an associate to a subsidiary due to changes in the consolidated scope during the year ended December 31, 2022.
[11] | Although the Company does not hold a stake as of December 31, 2022, considering the purpose and design of the structured entity, the Company is exposed to volatility in the profits of the structured entity. In addition, Group has the ability to direct activities that can most significantly affect the operations of the structured entity, so it has been determined that the Company has control over the entity.

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