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Revenues - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Retail revenues	$ 128,058	$ 113,145
POR
Disaggregation of Revenue [Line Items]
Retail revenues	81,686	70,450
Non-POR
Disaggregation of Revenue [Line Items]
Retail revenues	46,372	42,695
Unbilled revenue
Disaggregation of Revenue [Line Items]
Retail revenues	(5,533)	(13,349)
Commercial | Billed Revenue
Disaggregation of Revenue [Line Items]
Retail revenues	31,509	26,732
Residential | Billed Revenue
Disaggregation of Revenue [Line Items]
Retail revenues	102,082	99,762
New England
Disaggregation of Revenue [Line Items]
Retail revenues	34,622	30,618
Mid-Atlantic
Disaggregation of Revenue [Line Items]
Retail revenues	49,932	42,005
Midwest
Disaggregation of Revenue [Line Items]
Retail revenues	19,559	21,297
Southwest
Disaggregation of Revenue [Line Items]
Retail revenues	23,945	19,225
Retail Electricity (a)
Disaggregation of Revenue [Line Items]
Retail revenues	88,041	78,755
Retail Electricity (a) | POR
Disaggregation of Revenue [Line Items]
Retail revenues	56,176	50,850
Retail Electricity (a) | Non-POR
Disaggregation of Revenue [Line Items]
Retail revenues	31,865	27,905
Retail Electricity (a) | Unbilled revenue
Disaggregation of Revenue [Line Items]
Retail revenues	(2,976)	(9,733)
Retail Electricity (a) | Commercial | Billed Revenue
Disaggregation of Revenue [Line Items]
Retail revenues	11,080	15,216
Retail Electricity (a) | Residential | Billed Revenue
Disaggregation of Revenue [Line Items]
Retail revenues	79,937	73,272
Retail Electricity (a) | New England
Disaggregation of Revenue [Line Items]
Retail revenues	29,461	26,241
Retail Electricity (a) | Mid-Atlantic
Disaggregation of Revenue [Line Items]
Retail revenues	30,419	28,550
Retail Electricity (a) | Midwest
Disaggregation of Revenue [Line Items]
Retail revenues	9,939	11,059
Retail Electricity (a) | Southwest
Disaggregation of Revenue [Line Items]
Retail revenues	18,222	12,905
Retail Natural Gas
Disaggregation of Revenue [Line Items]
Retail revenues	40,017	34,390
Retail Natural Gas | POR
Disaggregation of Revenue [Line Items]
Retail revenues	25,510	19,600
Retail Natural Gas | Non-POR
Disaggregation of Revenue [Line Items]
Retail revenues	14,507	14,790
Retail Natural Gas | Unbilled revenue
Disaggregation of Revenue [Line Items]
Retail revenues	(2,557)	(3,616)
Retail Natural Gas | Commercial | Billed Revenue
Disaggregation of Revenue [Line Items]
Retail revenues	20,429	11,516
Retail Natural Gas | Residential | Billed Revenue
Disaggregation of Revenue [Line Items]
Retail revenues	22,145	26,490
Retail Natural Gas | New England
Disaggregation of Revenue [Line Items]
Retail revenues	5,161	4,377
Retail Natural Gas | Mid-Atlantic
Disaggregation of Revenue [Line Items]
Retail revenues	19,513	13,455
Retail Natural Gas | Midwest
Disaggregation of Revenue [Line Items]
Retail revenues	9,620	10,238
Retail Natural Gas | Southwest
Disaggregation of Revenue [Line Items]
Retail revenues	$ 5,723	$ 6,320

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