Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2012

PUGET ENERGY [Member]

Entity Information [Line Items]

Schedule of Accumulated Other Comprehensive Income (Loss)

The following tables present the components of the Company’s accumulated other comprehensive income (OCI) at June 30, 2012 and December 31, 2011:

Puget Energy (Dollars in Thousands)	June 30, 2012			December 31, 2011
Net unrealized loss on energy derivative instruments	$	(1,186	)	$	(1,113	)
Net unrealized loss on interest rate swaps	(5,003		)	(14,599		)
Net unrealized loss and prior service cost on pension plans	(15,404		)	(15,195		)
Total Puget Energy, net of tax	$	(21,593	)	$	(30,907	)

PUGET SOUND ENERGY, INC. [Member]

Entity Information [Line Items]

Schedule of Accumulated Other Comprehensive Income (Loss)

Puget Sound Energy (Dollars in Thousands)	June 30, 2012			December 31, 2011
Net unrealized loss on energy derivative instruments	$	(8,143	)	$	(12,934	)
Net unrealized loss on treasury interest rate swaps	(6,782		)	(6,941		)
Net unrealized loss and prior service cost on pension plans	(165,061		)	(168,704		)
Total PSE, net of tax	$	(179,986	)	$	(188,579	)