SCHEDULE I CONDENSED FINANCIAL INFORMATION OF PUGET ENERGY Notes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Ownership percentage	100.00%
Net Income (Loss) Attributable to Parent	$ 260,849	$ 182,717	$ 210,708
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	319,854	180,429	203,761
Net Cash Provided by (Used in) Operating Activities	826,598	727,568	527,336
Net Cash Provided by (Used in) Investing Activities	(920,777)	(902,796)	(952,479)
Business Combination Adjustment, ASC 805	2,400	3,400	2,900
Parent Company [Member]
Net Income (Loss) Attributable to Parent	260,849	182,717	210,708
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	319,854	180,429	203,761
Net Cash Provided by (Used in) Operating Activities	143,691	38,280	68,724
Net Cash Provided by (Used in) Investing Activities	(21,783)	(31,043)	(251,708)
Subsidiaries [Member]
Net Income (Loss) Attributable to Parent	336,063	274,280	292,924
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	403,878	281,801	295,331
Net Cash Provided by (Used in) Operating Activities	920,393	824,810	623,924
Net Cash Provided by (Used in) Investing Activities	(906,906)	(871,097)	(912,363)
PSE and PLNG
Net Income (Loss) Attributable to Parent	$ 335,000	$ 274,300	$ 292,900