Risk Management Activities and Derivative Transactions Counterparty Credit Risk (Details)
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Jun. 30, 2014
Customers
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Sep. 30, 2013
Customers
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Derivative | ||
Number of active future commission merchants | 2 | |
Credit of Customers [Member]
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Derivative | ||
Number of customers that represent the percent of outstanding accounts receivable | 3 | 3 |
Percent of total outstanding accounts receivables | 27.00% | 27.00% |
Power Purchase Agreement
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Derivative | ||
Megawatts | 440 |