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PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION (Tables)
 12 Months Ended
Dec. 31, 2019
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)
2019
 
2018
Distribution - Electric
$
15,880.0

 
$
15,071.1

Distribution - Natural Gas
3,931.1

 
3,546.2

Transmission - Electric
10,958.4

 
10,153.9

Distribution - Water
1,726.5

 
1,639.8

Solar
200.2

 
164.1

Utility
32,696.2

 
30,575.1

Other (1)
1,025.6

 
778.6

Property, Plant and Equipment, Gross
33,721.8

 
31,353.7

Less:  Accumulated Depreciation
 
 
 
Utility    
(7,483.5
)
 
(7,126.2
)
Other
(387.4
)
 
(336.7
)
Total Accumulated Depreciation
(7,870.9
)
 
(7,462.9
)
Property, Plant and Equipment, Net
25,850.9

 
23,890.8

Construction Work in Progress
1,734.6

 
1,719.6

Total Property, Plant and Equipment, Net
$
27,585.5

 
$
25,610.4

 
As of December 31,
 
2019
 
2018
(Millions of Dollars)
CL&P
 
NSTAR
Electric
 
PSNH
 
CL&P
 
NSTAR
Electric
 
PSNH
Distribution - Electric
$
6,485.5

 
$
7,163.7

 
$
2,271.1

 
$
6,176.4

 
$
6,756.4

 
$
2,178.6

Transmission - Electric
5,043.0

 
4,411.9

 
1,498.7

 
4,700.5

 
4,065.9

 
1,338.7

Solar
—

 
200.2

 
—

 
—

 
164.1

 
—

Property, Plant and Equipment, Gross
11,528.5

 
11,775.8

 
3,769.8

 
10,876.9

 
10,986.4

 
3,517.3

Less:  Accumulated Depreciation
(2,385.7
)
 
(2,895.3
)
 
(799.9
)
 
(2,302.6
)
 
(2,702.0
)
 
(772.9
)
Property, Plant and Equipment, Net
9,142.8

 
8,880.5

 
2,969.9

 
8,574.3

 
8,284.4

 
2,744.4

Construction Work in Progress
483.0

 
592.3

 
159.6

 
335.4

 
510.3

 
135.7

Total Property, Plant and Equipment, Net
$
9,625.8

 
$
9,472.8

 
$
3,129.5

 
$
8,909.7

 
$
8,794.7

 
$
2,880.1


(1) 
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)
2019
 
2018
 
2017
Eversource
3.0
%
 
2.9
%
 
3.0
%
CL&P
2.8
%
 
2.8
%
 
2.8
%
NSTAR Electric
2.8
%
 
2.8
%
 
2.9
%
PSNH
2.8
%
 
2.8
%
 
3.1
%


The following table summarizes average remaining useful lives of depreciable assets:
 
As of December 31, 2019
(Years)
Eversource
 
CL&P
 
NSTAR Electric
 
PSNH
Distribution - Electric
34.3
 
35.3

 
33.7

 
33.2

Distribution - Natural Gas
43.2
 
—

 
—

 
—

Transmission - Electric
40.4
 
36.8

 
44.9

 
42.1

Distribution - Water
33.5
 
—

 
—

 
—

Solar
24.2
 
—

 
24.2

 
—

Other (1)
11.2
 
—

 
—

 
—



(1) 
The estimated useful life of computer software, hardware and equipment primarily ranges from 5 to 15 years and of buildings is 40 years.