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Other Commercial Events (Details) (USD $)
In Millions, unless otherwise specified
1 Months Ended9 Months Ended
Jun. 30, 2011
Sep. 30, 2011
mW
Other Commercial Events [Abstract]  
Recognized gain on coal reserves exchange $ 23.5
Project development fee received$ 14.6 
Capacity of new electricity generation project, Megawatts 1,600