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Regulatory matters - Approved Annual Revenue Increases (Details) - USD ($) $ in Thousands | Aug. 01, 2020 | Jul. 01, 2020 | Jul. 01, 2019
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Granite State Electric System |  |  |
Regulatory Liabilities [Line Items] |  |  |
Annual revenue increase |  |  | $ 2,093
Subsequent Event | Energy North Gas System |  |  |
Regulatory Liabilities [Line Items] |  |  |
Annual revenue increase |  | $ 1,613 |
Subsequent Event | Granite State Electric System |  |  |
Regulatory Liabilities [Line Items] |  |  |
Annual revenue increase |  | 5,474 |
Recoupment of difference between final and temporary rates |  | 1,836 |
Subsequent Event | Peach State Gas System |  |  |
Regulatory Liabilities [Line Items] |  |  |
Annual revenue increase | $ 1,566 |  |
Subsequent Event | Empire Electric (Missouri System) |  |  |
Regulatory Liabilities [Line Items] |  |  |
Annual revenue increase |  | $ 992 |

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