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Electric utility segment - Liquefied natural gas (Details)
May. 31, 2015
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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