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PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION (Tables)
 12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Schedule of Utility Property, Plant and Equipment
The depreciation rates for the various classes of utility property, plant and equipment aggregate to composite rates as follows:
(Percent)
2018
 
2017
 
2016
Eversource
2.9
%
 
3.0
%
 
3.0
%
CL&P
2.8
%
 
2.8
%
 
2.7
%
NSTAR Electric
2.8
%
 
2.9
%
 
2.9
%
PSNH
2.8
%
 
3.1
%
 
3.1
%
The following tables summarize property, plant and equipment by asset category:
Eversource
As of December 31,
(Millions of Dollars)
2018
 
2017
Distribution - Electric
$
15,071.1

 
$
14,410.5

Distribution - Natural Gas
3,546.2

 
3,244.2

Transmission - Electric
10,153.9

 
9,270.9

Distribution - Water
1,639.8

 
1,558.4

Solar
164.1

 
36.2

Utility
30,575.1

 
28,520.2

Other (1)
778.6

 
693.7

Property, Plant and Equipment, Gross
31,353.7

 
29,213.9

Less:  Accumulated Depreciation
 
 
 
Utility    
(7,126.2
)
 
(6,846.9
)
Other
(336.7
)
 
(286.9
)
Total Accumulated Depreciation
(7,462.9
)
 
(7,133.8
)
Property, Plant and Equipment, Net
23,890.8

 
22,080.1

Construction Work in Progress
1,719.6

 
1,537.4

Total Property, Plant and Equipment, Net
$
25,610.4

 
$
23,617.5

 
As of December 31,
 
2018
 
2017
(Millions of Dollars)
CL&P
 
NSTAR
Electric
 
PSNH
 
CL&P
 
NSTAR
Electric
 
PSNH
Distribution - Electric
$
6,176.4

 
$
6,756.4

 
$
2,178.6

 
$
5,888.3

 
$
6,479.0

 
$
2,083.4

Transmission - Electric
4,700.5

 
4,065.9

 
1,338.7

 
4,239.9

 
3,821.2

 
1,161.3

Solar
—

 
164.1

 
—

 
—

 
36.2

 
—

Property, Plant and Equipment, Gross
10,876.9

 
10,986.4

 
3,517.3

 
10,128.2

 
10,336.4

 
3,244.7

Less:  Accumulated Depreciation
(2,302.6
)
 
(2,702.0
)
 
(772.9
)
 
(2,239.0
)
 
(2,550.2
)
 
(751.8
)
Property, Plant and Equipment, Net
8,574.3

 
8,284.4

 
2,744.4

 
7,889.2

 
7,786.2

 
2,492.9

Construction Work in Progress
335.4

 
510.3

 
135.7

 
381.8

 
460.3

 
149.4

Total Property, Plant and Equipment, Net
$
8,909.7

 
$
8,794.7

 
$
2,880.1

 
$
8,271.0

 
$
8,246.5

 
$
2,642.3


(1) 
These assets are primarily comprised of building improvements, computer software, hardware and equipment at Eversource Service.

The following table summarizes average remaining useful lives of depreciable assets:
 
As of December 31, 2018
(Years)
Eversource
 
CL&P
 
NSTAR Electric
 
PSNH
Distribution - Electric
34.1
 
35.4

 
33.7

 
32.3

Distribution - Natural Gas
43.8
 
—

 
—

 
—

Transmission - Electric
41.3
 
38.0

 
45.3

 
42.9

Distribution - Water
33.3
 
—

 
—

 
—

Solar
24.9
 
—

 
24.9

 
—

Other
12.9
 
—

 
—

 
—