Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Contract with Customer, Asset, before Allowance for Credit Loss	$ 278,926		$ 278,926		$ 218,822
REVENUE	397,594	$ 396,307	805,395	$ 887,693
Revenue from Contract with Customer, Including Assessed Tax	390,717	388,189	791,934	871,070
Retail Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	380,947	374,361	767,155	827,237
Other non-606 revenue	6,269	7,537	11,975	15,276
Wholesale Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	6,698	9,444	19,320	33,695
Miscellaneous revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	3,072	4,384	5,459	10,138
Other non-606 revenue	608	581	1,486	1,347
RTO Capacity Revenue	0		0	8,155
Electricity [Member]
Disaggregation of Revenue [Line Items]
REVENUE	397,594	396,307	805,395	887,693
Utility | Retail Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,812	4,376	4,991	9,033
Utility | Retail Revenue [Member] | Residential Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	158,899	148,641	339,868	353,389
Utility | Retail Revenue [Member] | Small Commercial and Industrial
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	61,031	57,657	123,745	127,536
Utility | Retail Revenue [Member] | Large Commercial and Industrial
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	156,008	161,217	293,528	332,195
Utility | Retail Revenue [Member] | Public Lighting
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,197	2,470	5,023	5,084
Transmission Revenue | Miscellaneous revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 3,072	1,077	$ 5,459	$ 1,983
RTO Capacity Revenue		$ 3,307