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Acquisitions and divestments (Details) (USD $)
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6 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended | 1 Months Ended | 1 Months Ended | 0 Months Ended | 3 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2012
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May 02, 2013
Canadian Hills
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Jul. 31, 2012
Canadian Hills
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Mar. 30, 2012
Canadian Hills
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Dec. 31, 2012
Canadian Hills
item
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Jun. 30, 2013
Canadian Hills
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Jan. 31, 2012
Canadian Hills
MW
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Apr. 12, 2013
Auburndale, Lake and Pasco
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Jan. 30, 2013
Auburndale, Lake and Pasco
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Apr. 30, 2013
Auburndale, Lake and Pasco
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Apr. 30, 2013
Path 15
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Jun. 30, 2013
Path 15
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May 31, 2012
Primary Energy Recycling Corporation
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Feb. 29, 2012
Primary Energy Recycling Corporation
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Feb. 16, 2012
Primary Energy Recycling Corporation
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Apr. 02, 2013
Gregory
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Jun. 30, 2013
Gregory
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Sep. 30, 2013
Gregory
Subsequent event
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| Acquisition and divestments | ||||||||||||||||||
| Percentage acquired in entity | 48.00% | 51.00% | ||||||||||||||||
| Wind power project capacity (in MW) | 300 | |||||||||||||||||
| Percentage of ownership interest | 99.00% | 14.30% | 17.10% | |||||||||||||||
| Percentage of retained interest | 1.00% | |||||||||||||||||
| Project-level construction financing facility | $ 310,000,000 | $ 137,200,000 | ||||||||||||||||
| Construction loan | 290,000,000 | |||||||||||||||||
| Letter of credit facility | 20,000,000 | |||||||||||||||||
| Letter of credit facility, term | 5 years | |||||||||||||||||
| Investment in equity | 190,000,000 | |||||||||||||||||
| Tax equity investments received | 225,000,000 | |||||||||||||||||
| Number of institutional tax equity investors by whom tax equity investments received | 4 | |||||||||||||||||
| Own tax equity investment | 44,000,000 | 44,000,000 | ||||||||||||||||
| Interest sold (as a percent) | 100.00% | |||||||||||||||||
| Tax equity interests | 269,000,000 | |||||||||||||||||
| Short-term debt | 265,000,000 | 0 | ||||||||||||||||
| Proceeds from sale of remaining tax equity ownership | 42,100,000 | 92,000,000 | 25,000,000 | |||||||||||||||
| Total price | 140,000,000 | 56,000,000 | 30,200,000 | 274,200,000 | ||||||||||||||
| Expected proceeds from sale | 34,600,000 | |||||||||||||||||
| Proceeds from sale to be held in escrow account | 5,000,000 | |||||||||||||||||
| Term Of Escrow Account | 1 year | |||||||||||||||||
| Net cash proceeds from sale | 24,200,000 | 117,000,000 | 52,000,000 | |||||||||||||||
| Management termination fee | 4,000,000 | 6,000,000 | ||||||||||||||||
| Outstanding balance of senior credit facility | 64,100,000 | |||||||||||||||||
| Price of entity's common membership interest in equity method investee | 24,200,000 | |||||||||||||||||
| Gain on sale of equity method investment | $ 600,000 | $ 31,000,000 | ||||||||||||||||
| Entity's common membership interest to be purchased in equity method investee (in shares) | 7,462,830.33 | |||||||||||||||||