Revenue (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Dec. 31, 2020	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax		$ 1,494,876	$ 1,171,759
Total Other Revenue		46,311	21,678
Revenues		1,541,187	1,193,437
Non-utility expense and other		16,046	15,419
Electric		1,010,160	756,377
Natural gas		517,258	426,348
Other		13,769	10,712
Residential
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax		820,879	708,856
Commercial
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax		443,726	377,998
Industrial
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax		44,938	38,158
Other Retail Customer
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax		5,501	4,761
Wholesale
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax		142,260	13,147
Transmission and Transportation
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax		20,180	16,668
Miscellaneous Customer
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax		17,392	12,171
Electricity, US Regulated [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax		962,429	733,632
Total Other Revenue		47,731	22,745
Electricity, US Regulated [Member] | Residential
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax		470,855	416,260
Electricity, US Regulated [Member] | Commercial
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax		291,489	257,019
Electricity, US Regulated [Member] | Industrial
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax		33,847	30,073
Electricity, US Regulated [Member] | Other Retail Customer
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax		5,501	4,761
Electricity, US Regulated [Member] | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax		142,260	13,147
Electricity, US Regulated [Member] | Transmission and Transportation
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax		14,486	11,222
Electricity, US Regulated [Member] | Miscellaneous Customer
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax		3,991	1,150
Natural Gas, US Regulated [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax		518,678	427,415
Total Other Revenue		(1,420)	(1,067)
Natural Gas, US Regulated [Member] | Residential
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax		350,024	292,596
Natural Gas, US Regulated [Member] | Commercial
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax		152,237	120,979
Natural Gas, US Regulated [Member] | Industrial
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax		11,091	8,085
Natural Gas, US Regulated [Member] | Other Retail Customer
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax		0	0
Natural Gas, US Regulated [Member] | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax		0	0
Natural Gas, US Regulated [Member] | Transmission and Transportation
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax		5,694	5,446
Natural Gas, US Regulated [Member] | Miscellaneous Customer
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax		(368)	309
Other Revenue From Contracts with Customers [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax		13,769	10,712
Total Other Revenue		0	0
Other Revenue From Contracts with Customers [Member] | Residential
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax		0	0
Other Revenue From Contracts with Customers [Member] | Commercial
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax		0	0
Other Revenue From Contracts with Customers [Member] | Industrial
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax		0	0
Other Revenue From Contracts with Customers [Member] | Other Retail Customer
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax		0	0
Other Revenue From Contracts with Customers [Member] | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax		0	0
Other Revenue From Contracts with Customers [Member] | Transmission and Transportation
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax		0	0
Other Revenue From Contracts with Customers [Member] | Miscellaneous Customer
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax		13,769	10,712
Subsidiaries [Member]
Disaggregation of Revenue [Line Items]
Non-utility expense and other		8,014	12,814
Electric		1,010,160	756,377
Natural gas		517,258	426,348
Puget LNG [Member]
Disaggregation of Revenue [Line Items]
Revenue, Remaining Performance Obligation, Amount		195,566
Remaining Contract Term, PLNG	10 years
Puget LNG [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Disaggregation of Revenue [Line Items]
Revenue, Remaining Performance Obligation, Amount		$ 15,359
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period		1 year
Puget LNG [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Disaggregation of Revenue [Line Items]
Revenue, Remaining Performance Obligation, Amount		$ 19,710
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period		1 year
Puget LNG [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Disaggregation of Revenue [Line Items]
Revenue, Remaining Performance Obligation, Amount		$ 19,454
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period		1 year
Puget LNG [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Disaggregation of Revenue [Line Items]
Revenue, Remaining Performance Obligation, Amount		$ 19,454
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period		1 year
Puget LNG [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
Disaggregation of Revenue [Line Items]
Revenue, Remaining Performance Obligation, Amount		$ 19,454
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period		1 year
Puget LNG [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2029-01-01
Disaggregation of Revenue [Line Items]
Revenue, Remaining Performance Obligation, Amount		$ 102,135
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period
Puget LNG [Member] | Other Revenue From Contracts with Customers [Member] | Miscellaneous Customer
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax		$ 4,500	$ 100