Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 226,665	$ 194,206	$ 381,566	$ 339,431
Regulatory balancing account revenue	17,634	(162)	133,482	(14,287)
Total operating revenue	244,299	194,044	515,048	325,144
Total non-regulated revenue	5,513	4,485	10,611	9,108
Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	122,251	108,741	214,744	192,775
Business
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	41,906	37,846	76,455	69,820
Multiple residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	18,043	16,504	34,912	31,501
Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	7,119	5,874	13,759	11,508
Public authorities
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	10,918	8,991	17,880	15,416
Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	26,428	16,250	23,816	18,411
Operating and maintenance revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,188	3,075	6,436	6,310
Other non-regulated revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,720	800	2,949	1,582
Non-regulated revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	4,908	3,875	9,385	7,892
Lease revenue	605	610	1,226	1,216
Total non-regulated revenue	$ 5,513	$ 4,485	$ 10,611	$ 9,108