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Regulatory Matters - Regulatory Proceedings (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 01, 2021
Jun. 01, 2021
Dec. 31, 2021
BELCO      
Regulatory Liabilities [Line Items]      
Weighted average cost of capital (percent)   7.50%  
Annual revenue increase   $ 211,432  
Deferred revenue   $ 13,426  
Deferred revenue, period of collection   5 years  
EnergyNorth Gas System      
Regulatory Liabilities [Line Items]      
Annual revenue increase $ 6,300    
Requested increase, 2020 4,000    
Requested increase, 2021 $ 3,200    
Various      
Regulatory Liabilities [Line Items]      
Annual revenue increase     $ 800