Revenue (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended		9 Months Ended
	Aug. 13, 2021	Dec. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax			$ 765,064	$ 608,170	$ 2,640,881	$ 2,261,844
Regulated Operating Revenue, Other			34,042	7,093	53,074	18,806
Revenues			770,236	620,426	2,699,712	2,318,235
Non-utility expense and other			24,440	6,340	43,912	35,143
Electricity, US Regulated [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax			508,476	458,573	1,680,290	1,499,378
Natural Gas, US Regulated [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax			115,460	103,486	681,680	637,239
Other Revenue From Contracts with Customers [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax			141,128	46,111	278,911	125,227
Decoupling over-collection [Domain]
Disaggregation of Revenue [Line Items]
Regulated Operating Revenue, Other			(13,539)	2,189	(19,488)	23,089
Other Non-606 Revenue [Member]
Disaggregation of Revenue [Line Items]
Regulated Operating Revenue, Other			18,711	10,067	78,319	33,302
Subsidiaries [Member]
Disaggregation of Revenue [Line Items]
Regulated Operating Revenue, Other			34,042	7,093	53,074	18,806
Revenues			770,236	620,426	2,699,712	2,318,235
Non-utility expense and other			23,920	$ 5,510	42,290	$ 33,293
Nonutility Expense	$ 12,900
Nonutility Revenue	23,200
Other Non-Customer Revenue	$ 23,200
Puget LNG [Member]
Disaggregation of Revenue [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, 2026			19,454		19,454
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction			19,454		19,454
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction			19,454		19,454
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction			102,135		102,135
Revenue, Remaining Performance Obligation, Amount			195,566		195,566
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, 2025			19,710		19,710
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, 2025			$ 15,359		$ 15,359
Remaining Contract Term, PLNG		10 years