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Regulation and Rates Regulation and Rates (Tables)
 12 Months Ended
Dec. 31, 2011
Regulated Operations [Abstract]  
Schedule of Effects on Annual Revenue Due to Approved Rate Adjustments [Table Text Block]
The following table sets for PGA rate adjustments approved by the Washington Commission and the corresponding impact on PSE’s annual revenue based on the effective dates:
Effective Date
Percentage
Increase (Decrease) in Rates
 
Annual
Increase (Decrease)
in Revenue
(Dollars in Millions)
November 1, 2011
(4.3
)%
 
$
(43.5
)
November 1, 2010 – October 31, 2011
1.9

 
18.3

October 1, 2009 – October 31, 2010
(17.1
)
 
(198.1
)
June 1, 2009 – May 31, 2010
(1.8
)
 
(21.2
)
October 1, 2008 – September 30, 2009
11.1

 
108.8