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Electric utility subsidiary - Subsequent event (Details)
 0 Months Ended 9 Months Ended
Aug. 08, 2014
Sep. 30, 2014
Aug. 31, 2014
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Electric utility subsidiary [Abstract]      
Term of agreement 15 years    
Purchase agreement, period of first tranche   5 years  
Purchase agreement, period of second tranche   5 years  
Purchase agreement, period of third tranche   5 years  
Liquefaction capacity purchases, year one     800,000
Liquefaction capacity purchases, year two     800,000
Liquefaction capacity purchases, year three     800,000
Liquefaction capacity purchases, year four     800,000
Liquefaction capacity purchases, year five     800,000
Liquefaction capacity purchases, year six     700,000
Liquefaction capacity purchases, year seven     700,000
Liquefaction capacity purchases, year eight     700,000
Liquefaction capacity purchases, year nine     700,000
Liquefaction capacity purchases, year ten     700,000
Liquefaction capacity purchases, year eleven     600,000
Liquefaction capacity purchases, year twelve     600,000
Liquefaction capacity purchases, year thirteen     600,000
Liquefaction capacity purchases, year fourteen     600,000
Liquefaction capacity purchases, year fifteen     600,000