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SCHEDULE I CONDENSED FINANCIAL INFORMATION OF PUGET ENERGY Notes (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income	$ 36,088,000us-gaap_NetIncomeLoss	$ (12,958,000)us-gaap_NetIncomeLoss	$ 41,113,000us-gaap_NetIncomeLoss	$ 107,592,000us-gaap_NetIncomeLoss	$ 108,808,000us-gaap_NetIncomeLoss	$ 8,540,000us-gaap_NetIncomeLoss	$ 905,000us-gaap_NetIncomeLoss	$ 167,475,000us-gaap_NetIncomeLoss	$ 171,835,000us-gaap_NetIncomeLoss	$ 285,728,000us-gaap_NetIncomeLoss	$ 273,821,000us-gaap_NetIncomeLoss
Goodwill, Purchase Accounting Adjustments									3,500,000	(4,400,000)	9,400,000
Comprehensive Income (Loss), Net of Tax, Attributable to Parent									87,077,000us-gaap_ComprehensiveIncomeNetOfTax	366,272,000us-gaap_ComprehensiveIncomeNetOfTax	271,899,000us-gaap_ComprehensiveIncomeNetOfTax
Net Cash Provided by (Used in) Operating Activities									701,782,000	766,068,000	782,685,000
Net Cash Provided by (Used in) Investing Activities									(395,162,000)	(480,918,000)	(692,970,000)
PUGET ENERGY
Net income									171,835,000	285,728,000	273,821,000
Comprehensive Income (Loss), Net of Tax, Attributable to Parent									87,077,000	366,272,000	271,899,000
Net Cash Provided by (Used in) Operating Activities									225,459,000	307,115,000	67,122,000
Net Cash Provided by (Used in) Investing Activities									(2,164,000)	(1,120,000)	(20,501,000)
PUGET SOUND ENERGY, INC.
Net income	54,640,000	3,057,000	57,834,000	121,083,000	122,923,000	26,605,000	26,663,000	179,938,000	236,614,000	356,129,000	356,170,000
Comprehensive Income (Loss), Net of Tax, Attributable to Parent									161,396,000	447,588,000	357,551,000
Net Cash Provided by (Used in) Operating Activities									782,727,000	835,679,000	797,882,000
Net Cash Provided by (Used in) Investing Activities									$ (392,333,000)	$ (479,798,000)	$ (672,069,000)