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Electric utility subsidiary - Liquefied natural gas (Details) - May. 31, 2015 - t | Total
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Electric utility subsidiary [Abstract] |
Liquefaction capacity purchases, year one | 700,000
Purchase agreement, period of first tranche | 5 years
Purchase agreement, period of second tranche | 5 years
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 six | 600,000
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 eleven | 500,000
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
Purchase Agreement, Annual Capacity Purchases, Year Sixteen | 500,000
Purchase Agreement, Annual Capacity Purchases, Year Seventeen | 500,000
Purchase Agreement, Annual Capacity Purchases, Year Eighteen | 500,000
Purchase Agreement, Annual Capacity Purchases, Year Nineteen | 500,000
Purchase Agreement, Annual Capacity Purchases, Year Twenty | 500,000

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