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PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION - Schedule of Average Remaining Useful Lives of Depreciable Assets (Details) | 12 Months Ended
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Dec. 31, 2021
Property, Plant and Equipment [Line Items] |
Distribution - Electric | 33 years 4 months 24 days
Distribution - Natural Gas | 39 years 6 months
Transmission - Electric | 40 years 2 months 12 days
Distribution - Water | 38 years 6 months
Solar | 24 years 2 months 12 days
Other | 11 years 2 months 12 days
Computer Software, Hardware and Equipment | Minimum |
Property, Plant and Equipment [Line Items] |
Estimated useful life of property, plant and equipment | 5 years
Computer Software, Hardware and Equipment | Maximum |
Property, Plant and Equipment [Line Items] |
Estimated useful life of property, plant and equipment | 15 years
Buildings |
Property, Plant and Equipment [Line Items] |
Estimated useful life of property, plant and equipment | 40 years
The Connecticut Light and Power Company |
Property, Plant and Equipment [Line Items] |
Distribution - Electric | 35 years 3 months 18 days
Transmission - Electric | 36 years 6 months
NSTAR Electric Company |
Property, Plant and Equipment [Line Items] |
Distribution - Electric | 33 years 1 month 6 days
Transmission - Electric | 45 years 1 month 6 days
Solar | 24 years 2 months 12 days
Public Service Company of New Hampshire |
Property, Plant and Equipment [Line Items] |
Distribution - Electric | 29 years 8 months 12 days
Transmission - Electric | 40 years 9 months 18 days

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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