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Regulatory matters - Approved Annual Revenue Increases (Details) - USD ($) $ in Thousands |  |  |  |  |  |  | 12 Months Ended
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Sep. 16, 2020 | Aug. 01, 2020 | Jul. 01, 2020 | May 01, 2020 | Jul. 01, 2019 | Jan. 01, 2019 | Dec. 31, 2020
New England Natural Gas System |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |
Annual revenue increase (decrease) |  |  |  | $ 2,679 |  |  |
Energy North Gas System |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |
Annual revenue increase (decrease) |  |  | $ 1,613 |  |  |  |
Granite State Electric System |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |
Annual revenue increase (decrease) |  |  | 5,474 |  |  |  |
Recoupment of difference between final and temporary rates |  |  | $ 1,836 |  |  |  |
Temporary revenue increase |  |  |  |  | $ 2,093 |  |
Empire Electric System (Missouri) |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |
Annual revenue increase (decrease) | $ 992 |  |  |  |  |  |
Peach State Gas System |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |
Annual revenue increase (decrease) |  | $ 1,566 |  |  |  |  |
Calpeco Electric System |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |
Annual revenue increase (decrease) |  |  |  |  |  | $ 5,277 |
Various |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |
Annual revenue increase (decrease) |  |  |  |  |  |  | $ (283)

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