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Intangible Assets other than Goodwill (Details)
$ in Thousands, ₩ in Millions
 12 Months Ended
Dec. 31, 2017
KRW (₩)
Dec. 31, 2016
KRW (₩)
Dec. 31, 2017
AUD ($)
Dec. 31, 2016
AUD ($)
ERP system and others [Member]        
Disclosure of intangible assets material to entity [Line Items]        
Carrying value ₩ 1,135 ₩ 506    
Remaining amortisation period of intangible assets material to entity 3 years and 2 months ~ 3 years and 4 months 11 months ~ 1 year and 11 months    
SCADA O/S (POWERON RELIANCE) [Member]        
Disclosure of intangible assets material to entity [Line Items]        
Carrying value   ₩ 4,206    
Remaining amortisation period of intangible assets material to entity   3 years and 1 month    
AMI GATEWAY S/W [Member]        
Disclosure of intangible assets material to entity [Line Items]        
Carrying value ₩ 3,528      
Remaining amortisation period of intangible assets material to entity 3 years and 2 months      
Smart technology verification and standard design project conducting right [Member]        
Disclosure of intangible assets material to entity [Line Items]        
Carrying value ₩ 11,724 ₩ 5,750    
Remaining amortisation period of intangible assets material to entity 4 years and 9 months 5 years and 9 months    
Mining right of Bylong mine [Member]        
Disclosure of intangible assets material to entity [Line Items]        
Carrying value | $     $ 401,225 $ 401,225
Remaining amortisation period of intangible assets material to entity Mining rights are amortized using the units-of-production method and the amortization has not commenced yet. [1] Mining rights are amortized using the units-of-production method and the amortization has not commenced yet. [2]    
Development of maintenance system for utility plant [Member]        
Disclosure of intangible assets material to entity [Line Items]        
Carrying value   ₩ 518    
Remaining amortisation period of intangible assets material to entity   11 months    
Electricity sales information system [Member]        
Disclosure of intangible assets material to entity [Line Items]        
Carrying value ₩ 29,391      
Remaining amortisation period of intangible assets material to entity 4 years 3 months      
Contributions to ARP NRC DC [Member]        
Disclosure of intangible assets material to entity [Line Items]        
Carrying value ₩ 46,458 ₩ 41,190    
Remaining amortisation period of intangible assets material to entity - -    
Dangjin power plant load facility usage right [Member]        
Disclosure of intangible assets material to entity [Line Items]        
Carrying value ₩ 20,463 ₩ 26,759    
Remaining amortisation period of intangible assets material to entity 3 years 3 months 4 years and 3 months    
Sejong Haengbogdosi sharing charge [Member]        
Disclosure of intangible assets material to entity [Line Items]        
Carrying value ₩ 40,460 ₩ 44,502    
Remaining amortisation period of intangible assets material to entity 8 years and 11 months 9 years and 11 months    
Occupancy and use of public waters [Member]        
Disclosure of intangible assets material to entity [Line Items]        
Carrying value ₩ 103,269      
Remaining amortisation period of intangible assets material to entity 18 years 11 months      
Sillim electricity supply facility usage right [Member]        
Disclosure of intangible assets material to entity [Line Items]        
Carrying value   ₩ 2,196    
Remaining amortisation period of intangible assets material to entity   4 years and 11 months    
[1] Mining rights are amortized using the units-of-production method and the amortization has not commenced yet.
[2] Mining rights are amortized using the units-of-production method and the amortization has not commenced yet.