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PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION (Tables)
6 Months Ended
Jun. 30, 2021
Property, Plant and Equipment [Abstract]  
Summary of Property, Plant, and Equipment
The following tables summarize property, plant and equipment by asset category:
EversourceAs of June 30, 2021As of December 31, 2020
(Millions of Dollars)
Distribution - Electric$17,104.8 $16,703.2 
Distribution - Natural Gas6,227.8 6,111.2 
Transmission - Electric12,296.8 11,954.0 
Distribution - Water1,772.7 1,743.1 
Solar 200.4 201.5 
Utility37,602.5 36,713.0 
Other (1)
1,386.9 1,269.0 
Property, Plant and Equipment, Gross38,989.4 37,982.0 
Less:  Accumulated Depreciation  
Utility   (8,756.6)(8,476.3)
Other(525.8)(477.6)
Total Accumulated Depreciation(9,282.4)(8,953.9)
Property, Plant and Equipment, Net29,707.0 29,028.1 
Construction Work in Progress2,171.6 1,854.4 
Total Property, Plant and Equipment, Net$31,878.6 $30,882.5 
 As of June 30, 2021As of December 31, 2020
(Millions of Dollars)CL&PNSTAR
Electric
PSNHCL&PNSTAR
Electric
PSNH
Distribution - Electric$6,989.4 $7,716.5 $2,439.2 $6,820.7 $7,544.4 $2,378.4 
Transmission - Electric5,653.4 4,866.5 1,778.6 5,512.0 4,701.3 1,742.4 
Solar— 200.4 — — 201.5 — 
Property, Plant and Equipment, Gross
12,642.8 12,783.4 4,217.8 12,332.7 12,447.2 4,120.8 
Less:  Accumulated Depreciation
(2,559.4)(3,182.8)(879.9)(2,475.4)(3,074.1)(848.9)
Property, Plant and Equipment, Net
10,083.4 9,600.6 3,337.9 9,857.3 9,373.1 3,271.9 
Construction Work in Progress
395.8 836.6 129.9 377.3 750.0 102.4 
Total Property, Plant and Equipment, Net
$10,479.2 $10,437.2 $3,467.8 $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.