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PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION (Tables)
 12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment [Abstract]  
Schedule of Utility Property, Plant and Equipment
The following tables summarize the investments in utility property, plant and equipment by asset category:
Eversource
As of December 31,
(Millions of Dollars)
2016
 
2015
Distribution - Electric
$
13,716.9

 
$
13,054.8

Distribution - Natural Gas
3,010.4

 
2,727.2

Transmission - Electric
8,517.4

 
7,691.9

Generation
1,224.2

 
1,194.1

Electric and Natural Gas Utility
26,468.9

 
24,668.0

Other (1)
591.6

 
558.6

Property, Plant and Equipment, Gross
27,060.5

 
25,226.6

Less:  Accumulated Depreciation
 
 
 
Electric and Natural Gas Utility    
(6,480.4
)
 
(6,141.1
)
Other
(242.0
)
 
(255.6
)
Total Accumulated Depreciation
(6,722.4
)
 
(6,396.7
)
Property, Plant and Equipment, Net
20,338.1

 
18,829.9

Construction Work in Progress
1,012.4

 
1,062.5

Total Property, Plant and Equipment, Net
$
21,350.5

 
$
19,892.4


(1) These assets are primarily comprised of building improvements, computer software, hardware and equipment at Eversource Service.
 
As of December 31,
 
2016
 
2015
(Millions of Dollars)
CL&P
 
NSTAR
Electric
 
PSNH
 
WMECO
 
CL&P
 
NSTAR
Electric
 
PSNH
 
WMECO
Distribution
$
5,562.9

 
$
5,402.3

 
$
1,949.8

 
$
841.9

 
$
5,377.2

 
$
5,100.5

 
$
1,804.8

 
$
812.3

Transmission
3,912.9

 
2,435.8

 
1,059.3

 
1,061.1

 
3,618.0

 
2,131.3

 
928.2

 
964.9

Generation
—

 
—

 
1,188.2

 
36.0

 
—

 
—

 
1,158.1

 
36.0

Property, Plant and Equipment, Gross
9,475.8

 
7,838.1

 
4,197.3

 
1,939.0

 
8,995.2

 
7,231.8

 
3,891.1

 
1,813.2

Less:  Accumulated Depreciation
(2,082.4
)
 
(2,025.4
)
 
(1,254.7
)
 
(338.8
)
 
(2,041.9
)
 
(1,886.8
)
 
(1,171.0
)
 
(307.0
)
Property, Plant and Equipment, Net
7,393.4

 
5,812.7

 
2,942.6

 
1,600.2

 
6,953.3

 
5,345.0

 
2,720.1

 
1,506.2

Construction Work in Progress
239.0

 
239.1

 
96.7

 
78.1

 
203.5

 
310.5

 
135.3

 
69.1

Total Property, Plant and Equipment, Net
$
7,632.4

 
$
6,051.8

 
$
3,039.3

 
$
1,678.3

 
$
7,156.8

 
$
5,655.5

 
$
2,855.4

 
$
1,575.3

The following table summarizes average remaining useful lives of depreciable assets:
 
As of December 31, 2016
(Years)
Eversource
 
CL&P
 
NSTAR Electric
 
PSNH
 
WMECO
Distribution
35.1
 
37.7

 
32.0

 
31.3

 
30.7

Transmission
41.5
 
38.0

 
43.8

 
43.5

 
49.7

Generation
29.0
 
—

 
—

 
29.1

 
25.0

Other
11.0
 
—

 
—

 
—

 
—

The depreciation rates for the various classes of utility property, plant and equipment aggregate to composite rates as follows:
(Percent)
2016
 
2015
 
2014
Eversource
3.0
%
 
2.9
%
 
3.0
%
CL&P
2.7
%
 
2.7
%
 
2.7
%
NSTAR Electric
3.0
%
 
3.0
%
 
3.0
%
PSNH
3.1
%
 
3.2
%
 
3.0
%
WMECO
2.7
%
 
2.7
%
 
3.3
%