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Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Revenue (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Disaggregation of Revenue [Line Items]
Contract with Customer, Asset, before Allowance for Credit Loss	$ 290,016		$ 290,016		$ 280,922
REVENUE	582,128	$ 529,344	1,545,938	$ 1,445,728
Revenue from Contract with Customer, Including Assessed Tax	574,951	522,250	1,521,193	1,425,496
Retail Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	542,740	479,068	1,427,819	1,331,704
Other non-606 revenue	4,095	6,319	19,552	17,672
Wholesale Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	27,882	41,039	82,851	86,554
Miscellaneous revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	4,329	2,143	10,523	7,238
Other non-606 revenue	3,082	775		2,560
RTO Capacity Revenue			4,259	1,200
Electricity [Member]
Disaggregation of Revenue [Line Items]
REVENUE	582,128	529,344	1,545,938	1,445,728
Utility \| Retail Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,971	3,020	9,189	8,932
Utility \| Retail Revenue [Member] \| Residential Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	236,243	205,875	628,053	588,858
Utility \| Retail Revenue [Member] \| Small Commercial and Industrial
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	89,474	74,727	235,317	212,196
Utility \| Retail Revenue [Member] \| Large Commercial and Industrial
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	211,290	192,802	546,966	513,783
Utility \| Retail Revenue [Member] \| Public Lighting
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,762	2,644	$ 8,294	7,935
Transmission Revenue \| Miscellaneous revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,777	1,788		$ 6,038
RTO Capacity Revenue	$ 2,552	$ 355