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PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION (Tables) | 12 Months Ended
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Dec. 31, 2024
Property, Plant and Equipment [Abstract] |
Schedule of Utility Property, Plant and Equipment | The following tables summarize property, plant and equipment by asset category:
Eversource | As of December 31,
(Millions of Dollars) | 2024 |  | 2023
Distribution - Electric | $ | 21,144.1 |  |  | $ | 19,656.5 |
Distribution - Natural Gas | 8,922.2 |  |  | 8,155.3 |
Transmission - Electric | 16,130.9 |  |  | 14,666.8 |
Distribution - Water (1) | — |  |  | 2,280.1 |
Solar | 201.0 |  |  | 201.1 |
Utility | 46,398.2 |  |  | 44,959.8 |
Other (2) | 2,254.1 |  |  | 2,006.8 |
Property, Plant and Equipment, Gross | 48,652.3 |  |  | 46,966.6 |
Less: Accumulated Depreciation |  |  |
Utility | (9,636.5) |  |  | (9,670.1) |
Other | (1,044.1) |  |  | (869.6) |
Total Accumulated Depreciation | (10,680.6) |  |  | (10,539.7) |
Property, Plant and Equipment, Net | 37,971.7 |  |  | 36,426.9 |
Construction Work in Progress | 3,014.9 |  |  | 3,071.7 |
Total Property, Plant and Equipment, Net | $ | 40,986.6 |  |  | $ | 39,498.6 |
| As of December 31,
| 2024 |  | 2023
(Millions of Dollars) | CL&P |  | NSTAR Electric |  | PSNH |  | CL&P |  | NSTAR Electric |  | PSNH
Distribution - Electric | $ | 8,437.9 |  |  | $ | 9,782.3 |  |  | $ | 2,964.2 |  |  | $ | 7,897.1 |  |  | $ | 9,000.5 |  |  | $ | 2,799.2 |
Transmission - Electric | 6,937.7 |  |  | 6,375.2 |  |  | 2,819.6 |  |  | 6,548.2 |  |  | 5,630.8 |  |  | 2,489.5 |
Solar | — |  |  | 201.0 |  |  | — |  |  | — |  |  | 201.1 |  |  | — |
Property, Plant and Equipment, Gross | 15,375.6 |  |  | 16,358.5 |  |  | 5,783.8 |  |  | 14,445.3 |  |  | 14,832.4 |  |  | 5,288.7 |
Less: Accumulated Depreciation | (2,928.0) |  |  | (3,782.0) |  |  | (1,032.3) |  |  | (2,670.5) |  |  | (3,585.9) |  |  | (984.0) |
Property, Plant and Equipment, Net | 12,447.6 |  |  | 12,576.5 |  |  | 4,751.5 |  |  | 11,774.8 |  |  | 11,246.5 |  |  | 4,304.7 |
Construction Work in Progress | 554.6 |  |  | 1,461.3 |  |  | 338.4 |  |  | 565.4 |  |  | 1,507.3 |  |  | 270.0 |
Total Property, Plant and Equipment, Net | $ | 13,002.2 |  |  | $ | 14,037.8 |  |  | $ | 5,089.9 |  |  | $ | 12,340.2 |  |  | $ | 12,753.8 |  |  | $ | 4,574.7 |
(1)As of December 31, 2024, the property, plant and equipment balance, net of accumulated depreciation, attributable to the Aquarion water distribution business has been reclassified to Assets Held for Sale on the Eversource balance sheet. As of December 31, 2023, this balance was recorded within Property, Plant and Equipment, Net on the Eversource balance sheet. For further information, see Note 24, “Assets Held for Sale.” (2)These assets are primarily comprised of computer software, hardware and equipment at Eversource Service and buildings at The Rocky River Realty Company. The depreciation rates for the various classes of utility property, plant and equipment aggregate to composite rates as follows:
(Percent) | 2024 |  | 2023 |  | 2022
Eversource | 3.2 | % |  | 3.1 | % |  | 3.0 | %
CL&P | 2.9 | % |  | 2.8 | % |  | 2.8 | %
NSTAR Electric | 2.8 | % |  | 2.7 | % |  | 2.7 | %
PSNH | 3.0 | % |  | 3.0 | % |  | 3.0 | %
The following table summarizes average remaining useful lives of depreciable assets:
| As of December 31, 2024
(Years) | Eversource |  | CL&P |  | NSTAR Electric |  | PSNH
Distribution - Electric | 33.4 |  | 34.7 |  | 33.4 |  | 29.9
Distribution - Natural Gas | 34.7 |  | — |  |  | — |  |  | — |
Transmission - Electric | 39.7 |  | 35.8 |  | 45.1 |  | 39.8
Distribution - Water | 45.2 |  | — |  |  | — |  |  | — |
Solar | 22.8 |  | — |  |  | 22.8 |  | — |
Other (1) | 9.9 |  | — |  |  | — |  |  | — |
(1)The estimated useful life of computer software, hardware and equipment primarily ranges from 5 to 15 years and of buildings is 40 years.

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- Definition Tabular disclosure of public utility physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation expense and method used, including composite depreciation, and accumulated depreciation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 980 -SubTopic 20 -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481834/980-20-45-1 + Details
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