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Assets pledged as collateral (Details) - 12 months ended Dec. 31, 2017
JD in Thousands, $ in Thousands, ₩ in Millions
KRW (₩)
USD ($)
JOD (JD)
Shareholdings of Gyeongju Wind Power Co., Ltd. [Member]      
Disclsoure of assets pledged as collateral [Line Items]      
Name of Guarantor Korea East-West Power Co., Ltd.    
Name of Guarantee Korea Development Bank and others    
Value of collateral ₩ 15,958    
Description of assets pledged as collateral description Collateral for borrowings    
Shareholdings of Commerce and Industry Energy Co., Ltd. [Member]      
Disclsoure of assets pledged as collateral [Line Items]      
Name of Guarantor Korea Midland Power Co.,Ltd.    
Name of Guarantee IBK and others    
Value of collateral ₩ 13,605    
Description of assets pledged as collateral description Collateral for borrowings    
Shareholdings of KOSPO Youngnam Power Co., Ltd. [Member]      
Disclsoure of assets pledged as collateral [Line Items]      
Name of Guarantor Korea Southern Power Co., Ltd.    
Name of Guarantee Shinhan Bank and others    
Value of collateral ₩ 40,000    
Description of assets pledged as collateral description Collateral for borrowings    
Shareholdings of Mira Power Limited [Member]      
Disclsoure of assets pledged as collateral [Line Items]      
Name of Guarantor Korea South-East Power Co., Ltd.    
Name of Guarantee International Finance Corporation and others    
Value of collateral ₩ 44,192    
Description of assets pledged as collateral description Collateral for borrowings    
Shareholdings of Gyeonggi Green Energy Co., Ltd. [Member]      
Disclsoure of assets pledged as collateral [Line Items]      
Name of Guarantor Korea Hydro & Nuclear Power Co., Ltd.    
Name of Guarantee Korea Development Bank and others    
Value of collateral ₩ 47,000    
Description of assets pledged as collateral description Collateral for borrowings    
Factory estate and others [Member]      
Disclsoure of assets pledged as collateral [Line Items]      
Name of Guarantor [1] Gyeonggi Green Energy Co., Ltd.    
Name of Guarantee [1] Korea Development Bank and others    
Value of collateral [1] ₩ 327,080    
Description of assets pledged as collateral description [1] Collateral for borrowings    
Land, buildings, structures and machinery and others [Member]      
Disclsoure of assets pledged as collateral [Line Items]      
Name of Guarantor Commerce and Industry Energy Co., Ltd.    
Name of Guarantee IBK and others    
Value of collateral ₩ 110,500    
Description of assets pledged as collateral description Collateral for borrowings    
Cash and Cash Equivalents [Member]      
Disclsoure of assets pledged as collateral [Line Items]      
Name of Guarantor Commerce and Industry Energy Co., Ltd.    
Name of Guarantee IBK and others    
Value of collateral ₩ 11,642    
Description of assets pledged as collateral description Collateral for borrowings    
Cash and cash equivalents 1 [Member]      
Disclsoure of assets pledged as collateral [Line Items]      
Name of Guarantor Gyeongju Wind Power Co., Ltd.    
Name of Guarantee SK Securities Co.,Ltd. and others    
Value of collateral ₩ 8,769    
Description of assets pledged as collateral description Collateral for borrowings    
Property, plant and equipment and others [Member]      
Disclsoure of assets pledged as collateral [Line Items]      
Name of Guarantor Gyeongju Wind Power Co., Ltd.    
Name of Guarantee SK Securities Co.,Ltd. and others    
Value of collateral ₩ 97,980    
Description of assets pledged as collateral description Collateral for borrowings    
Existing or expected trade receivables [Member]      
Disclsoure of assets pledged as collateral [Line Items]      
Name of Guarantor Gyeongju Wind Power Co., Ltd.    
Name of Guarantee SK Securities Co.,Ltd. and others    
Value of collateral ₩ 4,800    
Description of assets pledged as collateral description Collateral for borrowings    
Bank deposit and insurance claim [Member]      
Disclsoure of assets pledged as collateral [Line Items]      
Name of Guarantor KOSPO Youngnam Power Co., Ltd.    
Name of Guarantee Shinhan Bank and others    
Value of collateral ₩ 396,120    
Description of assets pledged as collateral description Collateral for borrowings    
Finance Lease receivable and property, plant and equipment and others [Member]      
Disclsoure of assets pledged as collateral [Line Items]      
Name of Guarantor Qatrana Electric Power Company    
Name of Guarantee The Islamic Development Bank and others    
Value of collateral | JD     JD 188,580
Description of assets pledged as collateral description Collateral for borrowings    
Finance Lease receivable and others [Member]      
Disclsoure of assets pledged as collateral [Line Items]      
Name of Guarantor KST Electric Power Company    
Name of Guarantee Scotiabank Inverlat, S.A    
Value of collateral | $   $ 2,890,260  
Description of assets pledged as collateral description Collateral for borrowings    
[1] The Company was provided with shares of Gyeonggi Green Energy Co., Ltd., one of its subsidiaries, from the investors as collateral related to long-term borrowings. Additionally, pledge for shares, pledge for transfer of rights of long-term borrowings, pledge for insurance claims and other pledges were established.