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Risk Management Activities and Derivative Transactions Counterparty Credit Risk (Details)
3 Months Ended
Dec. 31, 2015
merchants
Customers
megawatts
Dec. 31, 2014
Customers
Sep. 30, 2015
Customers
Derivative      
Number of active future commission merchants | merchants 2    
Credit of Customers      
Derivative      
Number of customers that represent the percent of sales 6 6  
Number of customers that represent the concentration of accounts receivable percent outstanding     3
Sales Concentration 32.00% 32.00%  
Percent of total outstanding accounts receivables     27.00%
Megawatts of Power Purchase Agreement      
Derivative      
Megawatts of Power Purchase Agreement | megawatts 440