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Guarantees provided between the related parties (Details)
ر.س in Thousands, $ in Thousands, ₩ in Millions
 12 Months Ended
Dec. 31, 2017
KRW (₩)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
SAR (ر.س)
Performance guarantees1 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Electric Power Corporation Korea Electric Power Corporation Korea Electric Power Corporation
Name of Guarantee Shuweihat Asia Operation & Maintenance Company Shuweihat Asia Operation & Maintenance Company Shuweihat Asia Operation & Maintenance Company
Name of Principal obligor SAPCO SAPCO SAPCO
Amount of guarantees | $   $ 11,000  
Performance guarantees2 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Electric Power Corporation Korea Electric Power Corporation Korea Electric Power Corporation
Name of Guarantee KNOC Nigerian East Oil Co., Ltd. and KNOC Nigerian West Oil Co., Ltd. KNOC Nigerian East Oil Co., Ltd. and KNOC Nigerian West Oil Co., Ltd. KNOC Nigerian East Oil Co., Ltd. and KNOC Nigerian West Oil Co., Ltd.
Name of Principal obligor Korea National Oil Corporation (Nigerian government) Korea National Oil Corporation (Nigerian government) Korea National Oil Corporation (Nigerian government)
Amount of guarantees | $   $ 34,650  
Performance guarantees and others1 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Electric Power Corporation Korea Electric Power Corporation Korea Electric Power Corporation
Name of Guarantee Rabigh Operation & Maintenance Company Limited Rabigh Operation & Maintenance Company Limited Rabigh Operation & Maintenance Company Limited
Name of Principal obligor RABEC RABEC RABEC
Amount of guarantees | $   $ 1,387  
Bidding guarantees [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Electric Power Corporation Korea Electric Power Corporation Korea Electric Power Corporation
Name of Guarantee Nghi Son 2 Power Ltd. Nghi Son 2 Power Ltd. Nghi Son 2 Power Ltd.
Name of Principal obligor SMBC Ho Chi Minh SMBC Ho Chi Minh SMBC Ho Chi Minh
Amount of guarantees | $   $ 10,000  
Debt guarantees1 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Electric Power Corporation Korea Electric Power Corporation Korea Electric Power Corporation
Name of Guarantee Barakah One Company Barakah One Company Barakah One Company
Name of Principal obligor Export-Import Bank of Korea and others Export-Import Bank of Korea and others Export-Import Bank of Korea and others
Amount of guarantees | $   $ 900,000  
Performance guarantees and others2 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Electric Power Corporation Korea Electric Power Corporation Korea Electric Power Corporation
Name of Guarantee Barakah One Company Barakah One Company Barakah One Company
Name of Principal obligor Export-Import Bank of Korea and others Export-Import Bank of Korea and others Export-Import Bank of Korea and others
Amount of guarantees | $   $ 3,404,275  
Collateralized money invested1 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Western Power Co., Ltd. Korea Western Power Co., Ltd. Korea Western Power Co., Ltd.
Name of Guarantee Cheongna Energy Co., Ltd. Cheongna Energy Co., Ltd. Cheongna Energy Co., Ltd.
Name of Principal obligor KEB Hana Bank and others KEB Hana Bank and others KEB Hana Bank and others
Amount of guarantees ₩ 27,211    
Guarantees for supplemental funding and others1 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Western Power Co., Ltd. [1] Korea Western Power Co., Ltd. [1] Korea Western Power Co., Ltd. [1]
Name of Guarantee Cheongna Energy Co., Ltd. [1] Cheongna Energy Co., Ltd. [1] Cheongna Energy Co., Ltd. [1]
Name of Principal obligor KEB Hana Bank and others [1] KEB Hana Bank and others [1] KEB Hana Bank and others [1]
Amount of guarantees ₩ 0 [1]    
Payment guarantees for business reserve [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Western Power Co., Ltd. Korea Western Power Co., Ltd. Korea Western Power Co., Ltd.
Name of Guarantee Xe-Pian Xe-Namnoy Power Co., Ltd. Xe-Pian Xe-Namnoy Power Co., Ltd. Xe-Pian Xe-Namnoy Power Co., Ltd.
Name of Principal obligor Krung Thai Bank Krung Thai Bank Krung Thai Bank
Amount of guarantees | $   $ 2,500  
Collateralized money invested2 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Western Power Co., Ltd. Korea Western Power Co., Ltd. Korea Western Power Co., Ltd.
Name of Guarantee Xe-Pian Xe-Namnoy Power Co., Ltd. Xe-Pian Xe-Namnoy Power Co., Ltd. Xe-Pian Xe-Namnoy Power Co., Ltd.
Name of Principal obligor Krung Thai Bank Krung Thai Bank Krung Thai Bank
Amount of guarantees | $   $ 62,253  
Impounding bonus guarantees [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Western Power Co., Ltd. Korea Western Power Co., Ltd. Korea Western Power Co., Ltd.
Name of Guarantee Xe-Pian Xe-Namnoy Power Co., Ltd. Xe-Pian Xe-Namnoy Power Co., Ltd. Xe-Pian Xe-Namnoy Power Co., Ltd.
Name of Principal obligor SK E&C SK E&C SK E&C
Amount of guarantees | $   $ 5,000  
Performance guarantees and others3 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Western Power Co., Ltd. Korea Western Power Co., Ltd. Korea Western Power Co., Ltd.
Name of Guarantee Rabigh Operation & Maintenance Company Limited Rabigh Operation & Maintenance Company Limited Rabigh Operation & Maintenance Company Limited
Name of Principal obligor Saudi Arabia British Bank Saudi Arabia British Bank Saudi Arabia British Bank
Amount of guarantees | ر.س     ر.س 5,600
Collateralized money invested3 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Western Power Co., Ltd. Korea Western Power Co., Ltd. Korea Western Power Co., Ltd.
Name of Guarantee Daegu Photovoltaic Co., Ltd. Daegu Photovoltaic Co., Ltd. Daegu Photovoltaic Co., Ltd.
Name of Principal obligor Korea Development Bank Korea Development Bank Korea Development Bank
Amount of guarantees ₩ 1,230    
Collateralized money invested4 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Western Power Co., Ltd. Korea Western Power Co., Ltd. Korea Western Power Co., Ltd.
Name of Guarantee Dongducheon Dream Power Co., Ltd. Dongducheon Dream Power Co., Ltd. Dongducheon Dream Power Co., Ltd.
Name of Principal obligor Kookmin Bank and others Kookmin Bank and others Kookmin Bank and others
Amount of guarantees ₩ 53,233    
Collateralized money invested5 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Western Power Co., Ltd. Korea Western Power Co., Ltd. Korea Western Power Co., Ltd.
Name of Guarantee PT. Mutiara Jawa PT. Mutiara Jawa PT. Mutiara Jawa
Name of Principal obligor Woori Bank Woori Bank Woori Bank
Amount of guarantees | $   $ 2,610  
Collateralized money invested6 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Western Power Co., Ltd. Korea Western Power Co., Ltd. Korea Western Power Co., Ltd.
Name of Guarantee Heang Bok Do Si Photovoltaic Power Co., Ltd. Heang Bok Do Si Photovoltaic Power Co., Ltd. Heang Bok Do Si Photovoltaic Power Co., Ltd.
Name of Principal obligor Nonghyup Bank Nonghyup Bank Nonghyup Bank
Amount of guarantees ₩ 194    
Collateralized money invested7 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Western Power Co., Ltd. Korea Western Power Co., Ltd. Korea Western Power Co., Ltd.
Name of Guarantee Shin Pyeongtaek Power Co., Ltd. Shin Pyeongtaek Power Co., Ltd. Shin Pyeongtaek Power Co., Ltd.
Name of Principal obligor Kookmin Bank Kookmin Bank Kookmin Bank
Amount of guarantees ₩ 43,920    
Collateralized money invested8 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea East-West Power Co., Ltd. Korea East-West Power Co., Ltd. Korea East-West Power Co., Ltd.
Name of Guarantee Busan Shinho Solar Power Co., Ltd. Busan Shinho Solar Power Co., Ltd. Busan Shinho Solar Power Co., Ltd.
Name of Principal obligor Korea Development Bank and others Korea Development Bank and others Korea Development Bank and others
Amount of guarantees ₩ 2,100    
Collateralized money invested9 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea East-West Power Co., Ltd. Korea East-West Power Co., Ltd. Korea East-West Power Co., Ltd.
Name of Guarantee Seokmun Energy Co., Ltd. Seokmun Energy Co., Ltd. Seokmun Energy Co., Ltd.
Name of Principal obligor Kookmin Bank and others Kookmin Bank and others Kookmin Bank and others
Amount of guarantees ₩ 15,370    
Collateralized money invested10 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea East-West Power Co., Ltd. Korea East-West Power Co., Ltd. Korea East-West Power Co., Ltd.
Name of Guarantee Chun-cheon Energy Co., Ltd. Chun-cheon Energy Co., Ltd. Chun-cheon Energy Co., Ltd.
Name of Principal obligor Kookmin Bank and others Kookmin Bank and others Kookmin Bank and others
Amount of guarantees ₩ 52,700    
Guarantees for supplemental funding1 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea East-West Power Co., Ltd. [1] Korea East-West Power Co., Ltd. [1] Korea East-West Power Co., Ltd. [1]
Name of Guarantee Chun-cheon Energy Co., Ltd. [1] Chun-cheon Energy Co., Ltd. [1] Chun-cheon Energy Co., Ltd. [1]
Name of Principal obligor Kookmin Bank and others [1] Kookmin Bank and others [1] Kookmin Bank and others [1]
Amount of guarantees ₩ 60,270 [1]    
Collateralized money invested11 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea East-West Power Co., Ltd. Korea East-West Power Co., Ltd. Korea East-West Power Co., Ltd.
Name of Guarantee Honam Wind Power Co., Ltd. Honam Wind Power Co., Ltd. Honam Wind Power Co., Ltd.
Name of Principal obligor Shinhan Bank and others Shinhan Bank and others Shinhan Bank and others
Amount of guarantees ₩ 3,480    
Collateralized money invested12 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea East-West Power Co., Ltd. Korea East-West Power Co., Ltd. Korea East-West Power Co., Ltd.
Name of Guarantee GS Donghae Electric Power Co., Ltd. GS Donghae Electric Power Co., Ltd. GS Donghae Electric Power Co., Ltd.
Name of Principal obligor Korea Development Bank and others Korea Development Bank and others Korea Development Bank and others
Amount of guarantees ₩ 204,000    
Collateralized money invested13 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea East-West Power Co., Ltd. Korea East-West Power Co., Ltd. Korea East-West Power Co., Ltd.
Name of Guarantee Yeonggwangbaeksu Wind Power Co., Ltd. Yeonggwangbaeksu Wind Power Co., Ltd. Yeonggwangbaeksu Wind Power Co., Ltd.
Name of Principal obligor Kookmin Bank and others Kookmin Bank and others Kookmin Bank and others
Amount of guarantees ₩ 3,000    
Collateralized money invested14 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea East-West Power Co., Ltd. Korea East-West Power Co., Ltd. Korea East-West Power Co., Ltd.
Name of Guarantee Yeonggwang Wind Power Co., Ltd. Yeonggwang Wind Power Co., Ltd. Yeonggwang Wind Power Co., Ltd.
Name of Principal obligor KEB Hana Bank and others KEB Hana Bank and others KEB Hana Bank and others
Amount of guarantees ₩ 15,375    
Debt guarantees2 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea East-West Power Co., Ltd. Korea East-West Power Co., Ltd. Korea East-West Power Co., Ltd.
Name of Guarantee PT. Tanjung Power Indonesia PT. Tanjung Power Indonesia PT. Tanjung Power Indonesia
Name of Principal obligor The Bank of Tokyo-Mitsubishi and others The Bank of Tokyo-Mitsubishi and others The Bank of Tokyo-Mitsubishi and others
Amount of guarantees | $   $ 46,983  
Other guarantees [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea East-West Power Co., Ltd. Korea East-West Power Co., Ltd. Korea East-West Power Co., Ltd.
Name of Guarantee PT. Tanjung Power Indonesia PT. Tanjung Power Indonesia PT. Tanjung Power Indonesia
Name of Principal obligor PT Adaro Indonesia PT Adaro Indonesia PT Adaro Indonesia
Amount of guarantees | $   $ 3,150  
Performance guarantees3 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor EWP Barbados 1 SRL EWP Barbados 1 SRL EWP Barbados 1 SRL
Name of Guarantee Jamaica Public Service Company Limited Jamaica Public Service Company Limited Jamaica Public Service Company Limited
Name of Principal obligor Societe Generale Societe Generale Societe Generale
Amount of guarantees | $   $ 14,400  
Guarantees for supplemental funding and others2 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor EWP Barbados 1 SRL [1],[2] EWP Barbados 1 SRL [1],[2] EWP Barbados 1 SRL [1],[2]
Name of Guarantee Jamaica Public Service Company Limited [1],[2] Jamaica Public Service Company Limited [1],[2] Jamaica Public Service Company Limited [1],[2]
Name of Principal obligor JCSD Trustee Services Limited and others [1],[2] JCSD Trustee Services Limited and others [1],[2] JCSD Trustee Services Limited and others [1],[2]
Amount of guarantees | $   $ 60,000 [1],[2]  
Collateralized money invested15 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Southern Power Co., Ltd. Korea Southern Power Co., Ltd. Korea Southern Power Co., Ltd.
Name of Guarantee KNH Solar Co., Ltd. KNH Solar Co., Ltd. KNH Solar Co., Ltd.
Name of Principal obligor Shinhan Bank and Kyobo Life Insurance Co., Ltd. Shinhan Bank and Kyobo Life Insurance Co., Ltd. Shinhan Bank and Kyobo Life Insurance Co., Ltd.
Amount of guarantees ₩ 1,296    
Performance guarantees and guarantees for supplemental funding and others1 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Southern Power Co., Ltd. [1] Korea Southern Power Co., Ltd. [1] Korea Southern Power Co., Ltd. [1]
Name of Guarantee KNH Solar Co., Ltd. [1] KNH Solar Co., Ltd. [1] KNH Solar Co., Ltd. [1]
Name of Principal obligor Shinhan Bank and Kyobo Life Insurance Co., Ltd. [1] Shinhan Bank and Kyobo Life Insurance Co., Ltd. [1] Shinhan Bank and Kyobo Life Insurance Co., Ltd. [1]
Amount of guarantees ₩ 0 [1]    
Collateralized money invested16 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Southern Power Co., Ltd. Korea Southern Power Co., Ltd. Korea Southern Power Co., Ltd.
Name of Guarantee Daeryun Power Co., Ltd. Daeryun Power Co., Ltd. Daeryun Power Co., Ltd.
Name of Principal obligor Korea Development Bank and others Korea Development Bank and others Korea Development Bank and others
Amount of guarantees ₩ 25,477    
Guarantees for supplemental funding and others3 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Southern Power Co., Ltd. [1] Korea Southern Power Co., Ltd. [1] Korea Southern Power Co., Ltd. [1]
Name of Guarantee Daeryun Power Co., Ltd. [1] Daeryun Power Co., Ltd. [1] Daeryun Power Co., Ltd. [1]
Name of Principal obligor Korea Development Bank and others [1] Korea Development Bank and others [1] Korea Development Bank and others [1]
Amount of guarantees ₩ 0 [1]    
Collateralized money invested17 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Southern Power Co., Ltd. Korea Southern Power Co., Ltd. Korea Southern Power Co., Ltd.
Name of Guarantee Changjuk Wind Power Co., Ltd. Changjuk Wind Power Co., Ltd. Changjuk Wind Power Co., Ltd.
Name of Principal obligor Shinhan Bank Shinhan Bank Shinhan Bank
Amount of guarantees ₩ 3,801    
Guarantees for supplemental funding2 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Southern Power Co., Ltd. [1] Korea Southern Power Co., Ltd. [1] Korea Southern Power Co., Ltd. [1]
Name of Guarantee Changjuk Wind Power Co., Ltd. [1] Changjuk Wind Power Co., Ltd. [1] Changjuk Wind Power Co., Ltd. [1]
Name of Principal obligor Shinhan Bank [1] Shinhan Bank [1] Shinhan Bank [1]
Amount of guarantees ₩ 0 [1]    
Collateralized money invested18 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Southern Power Co., Ltd. Korea Southern Power Co., Ltd. Korea Southern Power Co., Ltd.
Name of Guarantee Daegu Green Power Co., Ltd. Daegu Green Power Co., Ltd. Daegu Green Power Co., Ltd.
Name of Principal obligor Shinhan Bank Shinhan Bank Shinhan Bank
Amount of guarantees ₩ 46,226    
Performance guarantees4 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Southern Power Co., Ltd. Korea Southern Power Co., Ltd. Korea Southern Power Co., Ltd.
Name of Guarantee Kelar S.A Kelar S.A Kelar S.A
Name of Principal obligor KEB Hana Bank, SMBC, Mizuho Bank and others KEB Hana Bank, SMBC, Mizuho Bank and others KEB Hana Bank, SMBC, Mizuho Bank and others
Amount of guarantees | $   $ 63,707  
Collateralized money invested19 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Southern Power Co., Ltd. Korea Southern Power Co., Ltd. Korea Southern Power Co., Ltd.
Name of Guarantee DS Power Co., Ltd. DS Power Co., Ltd. DS Power Co., Ltd.
Name of Principal obligor Korea Development Bank and others Korea Development Bank and others Korea Development Bank and others
Amount of guarantees ₩ 2,900    
Guarantees for supplemental funding and others4 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Southern Power Co., Ltd. [1] Korea Southern Power Co., Ltd. [1] Korea Southern Power Co., Ltd. [1]
Name of Guarantee DS Power Co., Ltd. [1] DS Power Co., Ltd. [1] DS Power Co., Ltd. [1]
Name of Principal obligor Korea Development Bank and others [1] Korea Development Bank and others [1] Korea Development Bank and others [1]
Amount of guarantees ₩ 0 [1]    
Collateralized money invested20 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Southern Power Co., Ltd. Korea Southern Power Co., Ltd. Korea Southern Power Co., Ltd.
Name of Guarantee Pyeongchang Wind Power Co., Ltd. Pyeongchang Wind Power Co., Ltd. Pyeongchang Wind Power Co., Ltd.
Name of Principal obligor Woori Bank and Shinhan Bank Woori Bank and Shinhan Bank Woori Bank and Shinhan Bank
Amount of guarantees ₩ 3,875    
Performance guarantees and guarantees for supplemental funding and others2 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Southern Power Co., Ltd. [1] Korea Southern Power Co., Ltd. [1] Korea Southern Power Co., Ltd. [1]
Name of Guarantee Pyeongchang Wind Power Co., Ltd. [1] Pyeongchang Wind Power Co., Ltd. [1] Pyeongchang Wind Power Co., Ltd. [1]
Name of Principal obligor Woori Bank and Shinhan Bank [1] Woori Bank and Shinhan Bank [1] Woori Bank and Shinhan Bank [1]
Amount of guarantees ₩ 0 [1]    
Guarantees for supplemental funding and others5 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Southern Power Co., Ltd. [1] Korea Southern Power Co., Ltd. [1] Korea Southern Power Co., Ltd. [1]
Name of Guarantee Taebaek Wind Power Co., Ltd. [1] Taebaek Wind Power Co., Ltd. [1] Taebaek Wind Power Co., Ltd. [1]
Name of Principal obligor Shinhan Bank [1] Shinhan Bank [1] Shinhan Bank [1]
Amount of guarantees ₩ 0 [1]    
Collateralized money invested21 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Southern Power Co., Ltd. Korea Southern Power Co., Ltd. Korea Southern Power Co., Ltd.
Name of Guarantee Jeongam Wind Power Co., Ltd Jeongam Wind Power Co., Ltd Jeongam Wind Power Co., Ltd
Name of Principal obligor SK Securities Co., Ltd. SK Securities Co., Ltd. SK Securities Co., Ltd.
Amount of guarantees ₩ 5,580    
Guarantees for supplemental funding and others6 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Southern Power Co., Ltd. [1] Korea Southern Power Co., Ltd. [1] Korea Southern Power Co., Ltd. [1]
Name of Guarantee Jeongam Wind Power Co., Ltd [1] Jeongam Wind Power Co., Ltd [1] Jeongam Wind Power Co., Ltd [1]
Name of Principal obligor SK Securities Co., Ltd. [1] SK Securities Co., Ltd. [1] SK Securities Co., Ltd. [1]
Amount of guarantees ₩ 0 [1]    
Collateralized money invested22 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Southern Power Co., Ltd. Korea Southern Power Co., Ltd. Korea Southern Power Co., Ltd.
Name of Guarantee Naepo Green Energy Co., Ltd. Naepo Green Energy Co., Ltd. Naepo Green Energy Co., Ltd.
Name of Principal obligor Hana Financial Investment Co., Ltd. and others Hana Financial Investment Co., Ltd. and others Hana Financial Investment Co., Ltd. and others
Amount of guarantees ₩ 29,200    
Guarantees for supplemental funding and others7 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Southern Power Co., Ltd. [1] Korea Southern Power Co., Ltd. [1] Korea Southern Power Co., Ltd. [1]
Name of Guarantee Naepo Green Energy Co., Ltd. [1] Naepo Green Energy Co., Ltd. [1] Naepo Green Energy Co., Ltd. [1]
Name of Principal obligor Hana Financial Investment Co., Ltd. and others [1] Hana Financial Investment Co., Ltd. and others [1] Hana Financial Investment Co., Ltd. and others [1]
Amount of guarantees ₩ 0 [1]    
Collateralized money invested23 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor KEPCO Engineering & Construction Company, Inc. KEPCO Engineering & Construction Company, Inc. KEPCO Engineering & Construction Company, Inc.
Name of Guarantee DS Power Co., Ltd. DS Power Co., Ltd. DS Power Co., Ltd.
Name of Principal obligor Korea Development Bank and others Korea Development Bank and others Korea Development Bank and others
Amount of guarantees ₩ 15,000    
Collateralized money invested24 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Midland Power Co., Ltd. Korea Midland Power Co., Ltd. Korea Midland Power Co., Ltd.
Name of Guarantee Hyundai Green Power Co., Ltd. Hyundai Green Power Co., Ltd. Hyundai Green Power Co., Ltd.
Name of Principal obligor Korea Development Bank and others Korea Development Bank and others Korea Development Bank and others
Amount of guarantees ₩ 87,003    
Guarantees for supplemental funding and others8 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Midland Power Co., Ltd. [1] Korea Midland Power Co., Ltd. [1] Korea Midland Power Co., Ltd. [1]
Name of Guarantee Hyundai Green Power Co., Ltd. [1] Hyundai Green Power Co., Ltd. [1] Hyundai Green Power Co., Ltd. [1]
Name of Principal obligor Korea Development Bank and others [1] Korea Development Bank and others [1] Korea Development Bank and others [1]
Amount of guarantees ₩ 0 [1]    
Debt guarantees3 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Midland Power Co., Ltd. Korea Midland Power Co., Ltd. Korea Midland Power Co., Ltd.
Name of Guarantee PT. Cirebon Electric Power PT. Cirebon Electric Power PT. Cirebon Electric Power
Name of Principal obligor Mizuho Bank Mizuho Bank Mizuho Bank
Amount of guarantees | $   $ 11,550  
Debt guarantees4 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Midland Power Co., Ltd. Korea Midland Power Co., Ltd. Korea Midland Power Co., Ltd.
Name of Guarantee PT Wampu Electric Power PT Wampu Electric Power PT Wampu Electric Power
Name of Principal obligor SMBC SMBC SMBC
Amount of guarantees | $   $ 5,068  
Collateralized money invested25 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Midland Power Co., Ltd. Korea Midland Power Co., Ltd. Korea Midland Power Co., Ltd.
Name of Guarantee Gangwon Wind Power Co., Ltd. Gangwon Wind Power Co., Ltd. Gangwon Wind Power Co., Ltd.
Name of Principal obligor IBK and others IBK and others IBK and others
Amount of guarantees ₩ 7,409    
Collateralized money invested26 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Midland Power Co., Ltd. Korea Midland Power Co., Ltd. Korea Midland Power Co., Ltd.
Name of Guarantee YaksuESS Co., Ltd YaksuESS Co., Ltd YaksuESS Co., Ltd
Name of Principal obligor Hanwha Life Insurance Co., Ltd. Hanwha Life Insurance Co., Ltd. Hanwha Life Insurance Co., Ltd.
Amount of guarantees ₩ 210    
Guarantees for supplemental funding and others9 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Midland Power Co., Ltd. [1] Korea Midland Power Co., Ltd. [1] Korea Midland Power Co., Ltd. [1]
Name of Guarantee YaksuESS Co., Ltd [1] YaksuESS Co., Ltd [1] YaksuESS Co., Ltd [1]
Name of Principal obligor Hanwha Life Insurance Co., Ltd. [1] Hanwha Life Insurance Co., Ltd. [1] Hanwha Life Insurance Co., Ltd. [1]
Amount of guarantees ₩ 0 [1]    
Collateralized money invested27 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea South-East Power Co., Ltd. Korea South-East Power Co., Ltd. Korea South-East Power Co., Ltd.
Name of Guarantee Hyundai Energy Co., Ltd. Hyundai Energy Co., Ltd. Hyundai Energy Co., Ltd.
Name of Principal obligor Korea Development Bank and others Korea Development Bank and others Korea Development Bank and others
Amount of guarantees ₩ 47,067    
Performance guarantees and guarantees for supplemental funding and others3 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea South-East Power Co., Ltd. [1] Korea South-East Power Co., Ltd. [1] Korea South-East Power Co., Ltd. [1]
Name of Guarantee Hyundai Energy Co., Ltd. [1] Hyundai Energy Co., Ltd. [1] Hyundai Energy Co., Ltd. [1]
Name of Principal obligor Korea Development Bank and others [1] Korea Development Bank and others [1] Korea Development Bank and others [1]
Amount of guarantees ₩ 78,600 [1]    
Collateralized money invested28 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea South-East Power Co., Ltd. Korea South-East Power Co., Ltd. Korea South-East Power Co., Ltd.
Name of Guarantee RES Technology AD RES Technology AD RES Technology AD
Name of Principal obligor UniCredit Bulbank and others UniCredit Bulbank and others UniCredit Bulbank and others
Amount of guarantees ₩ 15,595    
Collateralized money invested29 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea South-East Power Co., Ltd. Korea South-East Power Co., Ltd. Korea South-East Power Co., Ltd.
Name of Guarantee ASM-BG Investicii AD ASM-BG Investicii AD ASM-BG Investicii AD
Name of Principal obligor UniCredit Bulbank and others UniCredit Bulbank and others UniCredit Bulbank and others
Amount of guarantees ₩ 16,101    
Guarantees for supplemental funding and others10 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea South-East Power Co., Ltd. [1],[3] Korea South-East Power Co., Ltd. [1],[3] Korea South-East Power Co., Ltd. [1],[3]
Name of Guarantee Express Solar-light Power Generation Co., Ltd. [1],[3] Express Solar-light Power Generation Co., Ltd. [1],[3] Express Solar-light Power Generation Co., Ltd. [1],[3]
Name of Principal obligor Woori Bank [1],[3] Woori Bank [1],[3] Woori Bank [1],[3]
Amount of guarantees ₩ 2,500 [1],[3]    
Collateralized money invested30 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea South-East Power Co., Ltd. Korea South-East Power Co., Ltd. Korea South-East Power Co., Ltd.
Name of Guarantee S-Power Co., Ltd. S-Power Co., Ltd. S-Power Co., Ltd.
Name of Principal obligor Korea Development Bank and others Korea Development Bank and others Korea Development Bank and others
Amount of guarantees ₩ 132,300    
Guarantees for supplemental funding and others11 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor KOSEP USA, INC. [1] KOSEP USA, INC. [1] KOSEP USA, INC. [1]
Name of Guarantee KODE NOVUS II LLC [1] KODE NOVUS II LLC [1] KODE NOVUS II LLC [1]
Name of Principal obligor Korea Development Bank [1] Korea Development Bank [1] Korea Development Bank [1]
Amount of guarantees ₩ 0 [1]    
Guarantees for supplemental funding and others12 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor KOSEP USA, INC. [1] KOSEP USA, INC. [1] KOSEP USA, INC. [1]
Name of Guarantee KODE NOVUS I LLC [1] KODE NOVUS I LLC [1] KODE NOVUS I LLC [1]
Name of Principal obligor Export-Import Bank of Korea and others [1] Export-Import Bank of Korea and others [1] Export-Import Bank of Korea and others [1]
Amount of guarantees ₩ 0 [1]    
Collateralized money invested31 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Hydro & Nuclear Power Co., Ltd. Korea Hydro & Nuclear Power Co., Ltd. Korea Hydro & Nuclear Power Co., Ltd.
Name of Guarantee Yeongwol Energy Station Co., Ltd. Yeongwol Energy Station Co., Ltd. Yeongwol Energy Station Co., Ltd.
Name of Principal obligor Meritz Fire & Marine Insurance Co., Ltd. Meritz Fire & Marine Insurance Co., Ltd. Meritz Fire & Marine Insurance Co., Ltd.
Amount of guarantees ₩ 1,400    
Collateralized money invested32 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Hydro & Nuclear Power Co., Ltd. Korea Hydro & Nuclear Power Co., Ltd. Korea Hydro & Nuclear Power Co., Ltd.
Name of Guarantee Noeul Green Energy Co., Ltd., Noeul Green Energy Co., Ltd., Noeul Green Energy Co., Ltd.,
Name of Principal obligor KEB Hana Bank and others KEB Hana Bank and others KEB Hana Bank and others
Amount of guarantees ₩ 1,740    
Collateralized money invested33 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor Korea Hydro & Nuclear Power Co., Ltd. Korea Hydro & Nuclear Power Co., Ltd. Korea Hydro & Nuclear Power Co., Ltd.
Name of Guarantee Busan Green Energy Co., Ltd. Busan Green Energy Co., Ltd. Busan Green Energy Co., Ltd.
Name of Principal obligor Shinhan Bank and others Shinhan Bank and others Shinhan Bank and others
Amount of guarantees ₩ 5,243    
Collateralized money invested34 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor KEPCO Plant Service & Engineering Co., Ltd. KEPCO Plant Service & Engineering Co., Ltd. KEPCO Plant Service & Engineering Co., Ltd.
Name of Guarantee Incheon New Power Co., Ltd. Incheon New Power Co., Ltd. Incheon New Power Co., Ltd.
Name of Principal obligor Shinhan Bank Shinhan Bank Shinhan Bank
Amount of guarantees ₩ 8,160    
Guarantees for supplemental funding and others13 [Member]      
Disclosure of Guarantees provided between the related parties [Line Items]      
Name of Primary guarantor KEPCO Plant Service & Engineering Co., Ltd. [1] KEPCO Plant Service & Engineering Co., Ltd. [1] KEPCO Plant Service & Engineering Co., Ltd. [1]
Name of Guarantee Incheon New Power Co., Ltd. [1] Incheon New Power Co., Ltd. [1] Incheon New Power Co., Ltd. [1]
Name of Principal obligor Shinhan Bank [1] Shinhan Bank [1] Shinhan Bank [1]
Amount of guarantees ₩ 0 [1]    
[1] The Company guarantees to provide supplemental funding for business with respect to excessive business expenses or insufficient repayment of borrowings.
[2] This includes a guarantee for the shareholder’s capital payment in connection with the business of 190MW gas complex thermal power plant in Jamaica. EWP (Barbados) 1 SRL’s capital contribution amount is USD 6,400 thousand and the total amount of guarantees is USD 27,000 thousand which consists of USD 12,000 thousand of EWP (Barbados) 1 SRL’s contribution obligation and USD 15,000 thousand of SJEH’s portion (50%) of contribution obligation.
[3] The Company has granted the right to Hana Financial Investment Co., Ltd., as an agent for the creditors to Express Solar-light Power Generation Co., Ltd. (“ESPG”), to the effect that in the event of acceleration of ESPG’s payment obligations under certain borrowings to such creditors, Hana Financial may demand the Company to dispose of shares in ESPG held by the Company and apply the resulting proceeds to repayment of ESPG’s obligations.