Revenues - Schedule of Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Net asset optimization expense	$ (636)	$ (531)	$ (2,885)	$ (2,128)
Total Revenues	90,029	86,696	232,286	200,752
Retail revenues
Disaggregation of Revenue [Line Items]
Retail revenues	90,635	86,960	235,138	201,348
Other revenue
Disaggregation of Revenue [Line Items]
Retail revenues	30	267	33	1,532
POR \| Retail revenues
Disaggregation of Revenue [Line Items]
Retail revenues	53,327	51,257	138,227	121,015
Non-POR \| Retail revenues
Disaggregation of Revenue [Line Items]
Retail revenues	37,308	35,703	96,911	80,333
Unbilled revenue \| Retail revenues
Disaggregation of Revenue [Line Items]
Retail revenues	777	8	(5,287)	(7,272)
Commercial \| Billed Revenue \| Retail revenues
Disaggregation of Revenue [Line Items]
Retail revenues	25,631	21,293	71,478	53,372
Residential \| Billed Revenue \| Retail revenues
Disaggregation of Revenue [Line Items]
Retail revenues	64,227	65,659	168,947	155,248
New England \| Retail revenues
Disaggregation of Revenue [Line Items]
Retail revenues	17,601	22,843	44,068	54,807
Mid-Atlantic \| Retail revenues
Disaggregation of Revenue [Line Items]
Retail revenues	34,962	33,426	94,046	79,380
Midwest \| Retail revenues
Disaggregation of Revenue [Line Items]
Retail revenues	9,866	8,625	30,204	23,305
Southwest \| Retail revenues
Disaggregation of Revenue [Line Items]
Retail revenues	28,206	22,066	66,820	43,856
Retail Electricity \| Retail revenues
Disaggregation of Revenue [Line Items]
Retail revenues	66,810	71,148	147,530	148,477
Retail Electricity \| POR \| Retail revenues
Disaggregation of Revenue [Line Items]
Retail revenues	42,956	44,080	98,890	94,369
Retail Electricity \| Non-POR \| Retail revenues
Disaggregation of Revenue [Line Items]
Retail revenues	23,854	27,068	48,640	54,108
Retail Electricity \| Unbilled revenue \| Retail revenues
Disaggregation of Revenue [Line Items]
Retail revenues	5,102	4,203	(1,196)	(781)
Retail Electricity \| Commercial \| Billed Revenue \| Retail revenues
Disaggregation of Revenue [Line Items]
Retail revenues	8,712	9,989	19,513	21,354
Retail Electricity \| Residential \| Billed Revenue \| Retail revenues
Disaggregation of Revenue [Line Items]
Retail revenues	52,996	56,956	129,213	127,904
Retail Electricity \| New England \| Retail revenues
Disaggregation of Revenue [Line Items]
Retail revenues	15,919	21,271	37,191	48,610
Retail Electricity \| Mid-Atlantic \| Retail revenues
Disaggregation of Revenue [Line Items]
Retail revenues	28,509	27,514	67,369	58,213
Retail Electricity \| Midwest \| Retail revenues
Disaggregation of Revenue [Line Items]
Retail revenues	7,032	6,518	15,151	13,827
Retail Electricity \| Southwest \| Retail revenues
Disaggregation of Revenue [Line Items]
Retail revenues	15,350	15,845	27,819	27,827
Retail Natural Gas \| Retail revenues
Disaggregation of Revenue [Line Items]
Retail revenues	23,825	15,812	87,608	52,871
Retail Natural Gas \| POR \| Retail revenues
Disaggregation of Revenue [Line Items]
Retail revenues	10,371	7,177	39,337	26,646
Retail Natural Gas \| Non-POR \| Retail revenues
Disaggregation of Revenue [Line Items]
Retail revenues	13,454	8,635	48,271	26,225
Retail Natural Gas \| Unbilled revenue \| Retail revenues
Disaggregation of Revenue [Line Items]
Retail revenues	(4,325)	(4,195)	(4,091)	(6,491)
Retail Natural Gas \| Commercial \| Billed Revenue \| Retail revenues
Disaggregation of Revenue [Line Items]
Retail revenues	16,919	11,304	51,965	32,018
Retail Natural Gas \| Residential \| Billed Revenue \| Retail revenues
Disaggregation of Revenue [Line Items]
Retail revenues	11,231	8,703	39,734	27,344
Retail Natural Gas \| New England \| Retail revenues
Disaggregation of Revenue [Line Items]
Retail revenues	1,682	1,572	6,877	6,197
Retail Natural Gas \| Mid-Atlantic \| Retail revenues
Disaggregation of Revenue [Line Items]
Retail revenues	6,453	5,912	26,677	21,167
Retail Natural Gas \| Midwest \| Retail revenues
Disaggregation of Revenue [Line Items]
Retail revenues	2,834	2,107	15,053	9,478
Retail Natural Gas \| Southwest \| Retail revenues
Disaggregation of Revenue [Line Items]
Retail revenues	$ 12,856	$ 6,221	$ 39,001	$ 16,029