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Electric utility subsidiary - Liquefied natural gas (Details) - t |  | 3 Months Ended |
--- | --- | --- | ---
Aug. 08, 2014 | Mar. 31, 2015 | Aug. 31, 2014
Electric utility subsidiary [Abstract] |  |  |
Term of agreement | 15 years |  |
Liquefaction capacity purchases, year one |  |  | 800,000
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 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

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