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Assets pledged as collateral (Details) - 12 months ended Dec. 31, 2018
JD in Thousands, $ in Thousands, ₩ in Millions
KRW (₩)
USD ($)
JOD (JD)
Land, buildings, structures and machinery and others      
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 [1] Collateral for borrowings    
Shareholdings of DS Power Co., Ltd.      
Disclsoure of assets pledged as collateral [Line Items]      
Name of Guarantor Korea Southern Power Co., Ltd    
Name of Guarantee Korea Development Bank and others    
Value of collateral ₩ 916    
Description of assets pledged as collateral description Collateral for borrowings    
Property, plant and equipment and others 1      
Disclsoure of assets pledged as collateral [Line Items]      
Name of Guarantor Mira Power Limited    
Name of Guarantee International Finance Corporation and others    
Value of collateral | $   $ 275,600  
Description of assets pledged as collateral description [2] Collateral for borrowings    
Cash and Cash Equivalents      
Disclsoure of assets pledged as collateral [Line Items]      
Name of Guarantor Gyeonggi Green Energy Co., Ltd.    
Name of Guarantee Korea Development Bank and others    
Value of collateral ₩ 327,080    
Description of assets pledged as collateral description [1] Collateral for borrowings    
Cash and cash equivalents      
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 [1] Collateral for borrowings    
Property, plant and equipment and others      
Disclsoure of assets pledged as collateral [Line Items]      
Name of Guarantor Gyeongju Wind Power Co., Ltd.    
Name of Guarantee Samsung Fire & Marine Insurance Co., Ltd. And others    
Value of collateral ₩ 110,240    
Description of assets pledged as collateral description [1] Collateral for borrowings    
Utility plant and others      
Disclsoure of assets pledged as collateral [Line Items]      
Name of Guarantor Korea Offshore Wind Power Co., Ltd    
Name of Guarantee Woori Bank and others    
Value of collateral ₩ 293,400    
Description of assets pledged as collateral description Collateral for borrowings    
Finance Lease receivable and property, plant and equipment and others      
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 236,570
Description of assets pledged as collateral description [2] Collateral for borrowings    
Finance Lease receivable and others      
Disclsoure of assets pledged as collateral [Line Items]      
Name of Guarantor KST Electric Power Company    
Name of Guarantee The Export - Import Bank of Korea and others    
Value of collateral | $   $ 337,000  
Description of assets pledged as collateral description [2] Collateral for borrowings    
[1] As of December 31, 2018, the Company has established guarantees for pledge for transfer of rights of long-term borrowings, pledge for insurance claims, pledge for shares, etc.
[2] This is based on the amount of loan commitment limit.