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PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION
 9 Months Ended
Sep. 30, 2021
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION
The following tables summarize property, plant and equipment by asset category:
EversourceAs of September 30, 2021As of December 31, 2020
(Millions of Dollars)
Distribution - Electric$17,257.3 $16,703.2 
Distribution - Natural Gas6,334.9 6,111.2 
Transmission - Electric12,396.2 11,954.0 
Distribution - Water1,771.1 1,743.1 
Solar 200.4 201.5 
Utility37,959.9 36,713.0 
Other (1)
1,430.5 1,269.0 
Property, Plant and Equipment, Gross39,390.4 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, Net30,010.2 29,028.1 
Construction Work in Progress2,456.9 1,854.4 
Total Property, Plant and Equipment, Net$32,467.1 $30,882.5 
 As of September 30, 2021As of December 31, 2020
(Millions of Dollars)CL&PNSTAR
Electric		PSNHCL&PNSTAR
Electric		PSNH
Distribution - Electric$7,028.9 $7,798.8 $2,469.9 $6,820.7 $7,544.4 $2,378.4 
Transmission - Electric5,707.9 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.