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PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION (Tables) | 9 Months Ended
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Sep. 30, 2021
Property, Plant and Equipment [Abstract] |
Summary of Property, Plant, and Equipment | The following tables summarize property, plant and equipment by asset category:
Eversource | As of September 30, 2021 |  | As of December 31, 2020
(Millions of Dollars) |
Distribution - Electric | $ | 17,257.3 |  |  | $ | 16,703.2 |
Distribution - Natural Gas | 6,334.9 |  |  | 6,111.2 |
Transmission - Electric | 12,396.2 |  |  | 11,954.0 |
Distribution - Water | 1,771.1 |  |  | 1,743.1 |
Solar | 200.4 |  |  | 201.5 |
Utility | 37,959.9 |  |  | 36,713.0 |
Other (1) | 1,430.5 |  |  | 1,269.0 |
Property, Plant and Equipment, Gross | 39,390.4 |  |  | 37,982.0 |
Less: Accumulated Depreciation |  |  |
Utility | (8,830.2) |  |  | (8,476.3) |
Other | (550.0) |  |  | (477.6) |
Total Accumulated Depreciation | (9,380.2) |  |  | (8,953.9) |
Property, Plant and Equipment, Net | 30,010.2 |  |  | 29,028.1 |
Construction Work in Progress | 2,456.9 |  |  | 1,854.4 |
Total Property, Plant and Equipment, Net | $ | 32,467.1 |  |  | $ | 30,882.5 |
| As of September 30, 2021 |  | As of December 31, 2020
(Millions of Dollars) | CL&P |  | NSTAR Electric |  | PSNH |  | CL&P |  | NSTAR Electric |  | PSNH
Distribution - Electric | $ | 7,028.9 |  |  | $ | 7,798.8 |  |  | $ | 2,469.9 |  |  | $ | 6,820.7 |  |  | $ | 7,544.4 |  |  | $ | 2,378.4 |
Transmission - Electric | 5,707.9 |  |  | 4,884.0 |  |  | 1,805.9 |  |  | 5,512.0 |  |  | 4,701.3 |  |  | 1,742.4 |
Solar | — |  |  | 200.4 |  |  | — |  |  | — |  |  | 201.5 |  |  | — |
Property, Plant and Equipment, Gross | 12,736.8 |  |  | 12,883.2 |  |  | 4,275.8 |  |  | 12,332.7 |  |  | 12,447.2 |  |  | 4,120.8 |
Less: Accumulated Depreciation | (2,574.6) |  |  | (3,220.7) |  |  | (895.4) |  |  | (2,475.4) |  |  | (3,074.1) |  |  | (848.9) |
Property, Plant and Equipment, Net | 10,162.2 |  |  | 9,662.5 |  |  | 3,380.4 |  |  | 9,857.3 |  |  | 9,373.1 |  |  | 3,271.9 |
Construction Work in Progress | 436.6 |  |  | 949.2 |  |  | 148.7 |  |  | 377.3 |  |  | 750.0 |  |  | 102.4 |
Total Property, Plant and Equipment, Net | $ | 10,598.8 |  |  | $ | 10,611.7 |  |  | $ | 3,529.1 |  |  | $ | 10,234.6 |  |  | $ | 10,123.1 |  |  | $ | 3,374.3 |
(1) These assets are primarily comprised of computer software, hardware and equipment at Eversource Service and buildings at The Rocky River Realty Company.

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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, deprecation expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84167750&loc=d3e42232-110370 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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