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Electric utility segment - Liquefied natural gas (Details) | May. 31, 2015 t
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Electric utility subsidiary [Abstract] |
Annual capacity purchases, tranche one | 700,000
Purchase agreement, period of first tranche | 5 years
Annual capacity purchases, tranche two | 600,000
Purchase agreement, period of second tranche | 5 years
Annual capacity purchases, tranche three | 500,000
Purchase agreement, period of third tranche | 10 years
Liquefaction capacity purchases, year two | 700,000
Liquefaction capacity purchases, year three | 700,000
Liquefaction capacity purchases, year four | 700,000
Liquefaction capacity purchases, year five | 700,000
Liquefaction capacity purchases, year seven | 600,000
Liquefaction capacity purchases, year eight | 600,000
Liquefaction capacity purchases, year nine | 600,000
Liquefaction capacity purchases, year ten | 600,000
Liquefaction capacity purchases, year twelve | 500,000
Liquefaction capacity purchases, year thirteen | 500,000
Liquefaction capacity purchases, year fourteen | 500,000
Liquefaction capacity purchases, year fifteen | 500,000
Liquefaction capacity purchases, year sixteen | 500,000
Liquefaction capacity purchases, year seventeen | 500,000
Liquefaction capacity purchases, year eighteen | 500,000
Liquefaction capacity purchases, year nineteen | 500,000
Liquefaction capacity purchases, year twenty | 500,000

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