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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, 2024
Property, Plant and Equipment [Line Items] |
Distribution - Electric | 33 years 4 months 24 days
Distribution - Natural Gas | 34 years 8 months 12 days
Transmission - Electric | 39 years 8 months 12 days
Distribution - Water | 45 years 2 months 12 days
Solar | 22 years 9 months 18 days
Other | 9 years 10 months 24 days
Computer Software, Hardware and Equipment | Minimum |
Property, Plant and Equipment [Line Items] |
Estimated useful life of property, plant and equipment (in years) | 5 years
Computer Software, Hardware and Equipment | Maximum |
Property, Plant and Equipment [Line Items] |
Estimated useful life of property, plant and equipment (in years) | 15 years
Buildings |
Property, Plant and Equipment [Line Items] |
Estimated useful life of property, plant and equipment (in years) | 40 years
CL&P |
Property, Plant and Equipment [Line Items] |
Distribution - Electric | 34 years 8 months 12 days
Transmission - Electric | 35 years 9 months 18 days
NSTAR Electric |
Property, Plant and Equipment [Line Items] |
Distribution - Electric | 33 years 4 months 24 days
Transmission - Electric | 45 years 1 month 6 days
Solar | 22 years 9 months 18 days
PSNH |
Property, Plant and Equipment [Line Items] |
Distribution - Electric | 29 years 10 months 24 days
Transmission - Electric | 39 years 9 months 18 days

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A + Details
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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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