Commitments And Contingencies (Details) (USD $)	1 Months Ended		9 Months Ended
	Aug. 31, 2010	May 31, 2004	Sep. 30, 2011	Mar. 30, 2007	Jun. 30, 2005
Commitments And Contingencies [Abstract]
Investigation reviewing (per MW)		$ 250
Owners percentage interest				15.00%
Accrual for environmental loss contingencies					$ 500,000
Number of hydroelectric plants			6
Number of diversion tunnels			2
Number of residences destroyed	2
Number of outbuildings destroyed	6