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Revenues - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Retail revenues	$ 117,187	$ 98,267	$ 343,592	$ 293,721
POR
Disaggregation of Revenue [Line Items]
Retail revenues	69,646	55,821	207,493	172,655
Non-POR
Disaggregation of Revenue [Line Items]
Retail revenues	47,541	42,446	136,099	121,066
Unbilled revenue
Disaggregation of Revenue [Line Items]
Retail revenues	(4,258)	(2,763)	(10,435)	(16,986)
Commercial | Billed Revenue
Disaggregation of Revenue [Line Items]
Retail revenues	19,221	14,471	70,973	57,356
Residential | Billed Revenue
Disaggregation of Revenue [Line Items]
Retail revenues	102,224	86,559	283,054	253,351
New England
Disaggregation of Revenue [Line Items]
Retail revenues	32,187	26,154	91,794	79,572
Mid-Atlantic
Disaggregation of Revenue [Line Items]
Retail revenues	39,042	31,476	121,700	100,013
Midwest
Disaggregation of Revenue [Line Items]
Retail revenues	13,782	13,840	45,754	47,409
Southwest
Disaggregation of Revenue [Line Items]
Retail revenues	32,176	26,797	84,344	66,727
Retail Electricity
Disaggregation of Revenue [Line Items]
Retail revenues	104,970	92,104	275,301	242,548
Retail Electricity | POR
Disaggregation of Revenue [Line Items]
Retail revenues	63,444	53,670	166,346	145,924
Retail Electricity | Non-POR
Disaggregation of Revenue [Line Items]
Retail revenues	41,526	38,434	108,955	96,624
Retail Electricity | Unbilled revenue
Disaggregation of Revenue [Line Items]
Retail revenues	(4,767)	(3,069)	(4,480)	(9,674)
Retail Electricity | Commercial | Billed Revenue
Disaggregation of Revenue [Line Items]
Retail revenues	12,560	12,395	33,119	38,782
Retail Electricity | Residential | Billed Revenue
Disaggregation of Revenue [Line Items]
Retail revenues	97,177	82,778	246,662	213,440
Retail Electricity | New England
Disaggregation of Revenue [Line Items]
Retail revenues	31,366	25,406	84,463	73,045
Retail Electricity | Mid-Atlantic
Disaggregation of Revenue [Line Items]
Retail revenues	33,761	30,122	89,304	81,981
Retail Electricity | Midwest
Disaggregation of Revenue [Line Items]
Retail revenues	12,165	12,473	31,396	32,894
Retail Electricity | Southwest
Disaggregation of Revenue [Line Items]
Retail revenues	27,678	24,103	70,138	54,628
Retail Natural Gas
Disaggregation of Revenue [Line Items]
Retail revenues	12,217	6,163	68,291	51,173
Retail Natural Gas | POR
Disaggregation of Revenue [Line Items]
Retail revenues	6,202	2,151	41,147	26,731
Retail Natural Gas | Non-POR
Disaggregation of Revenue [Line Items]
Retail revenues	6,015	4,012	27,144	24,442
Retail Natural Gas | Unbilled revenue
Disaggregation of Revenue [Line Items]
Retail revenues	509	306	(5,955)	(7,312)
Retail Natural Gas | Commercial | Billed Revenue
Disaggregation of Revenue [Line Items]
Retail revenues	6,661	2,076	37,854	18,574
Retail Natural Gas | Residential | Billed Revenue
Disaggregation of Revenue [Line Items]
Retail revenues	5,047	3,781	36,392	39,911
Retail Natural Gas | New England
Disaggregation of Revenue [Line Items]
Retail revenues	821	748	7,331	6,527
Retail Natural Gas | Mid-Atlantic
Disaggregation of Revenue [Line Items]
Retail revenues	5,281	1,354	32,396	18,032
Retail Natural Gas | Midwest
Disaggregation of Revenue [Line Items]
Retail revenues	1,617	1,367	14,358	14,515
Retail Natural Gas | Southwest
Disaggregation of Revenue [Line Items]
Retail revenues	$ 4,498	$ 2,694	$ 14,206	$ 12,099

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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