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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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