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PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION (Tables)
 9 Months Ended
Sep. 30, 2017
Property, Plant and Equipment [Abstract]  
Public Utility Property, Plant, and Equipment
The following tables summarize property, plant and equipment by asset category:
Eversource
As of September 30, 2017
 
As of December 31, 2016
(Millions of Dollars)
 
Distribution - Electric
$
14,217.3

 
$
13,716.9

Distribution - Natural Gas
3,158.1

 
3,010.4

Transmission - Electric
8,918.2

 
8,517.4

Generation
1,215.8

 
1,224.2

Electric and Natural Gas Utility
27,509.4

 
26,468.9

Other (1)
679.9

 
591.6

Property, Plant and Equipment, Gross
28,189.3

 
27,060.5

Less:  Accumulated Depreciation
 
 
 
Electric and Natural Gas Utility   
(6,838.5
)
 
(6,480.4
)
Other
(274.4
)
 
(242.0
)
Total Accumulated Depreciation
(7,112.9
)
 
(6,722.4
)
Property, Plant and Equipment, Net
21,076.4

 
20,338.1

Construction Work in Progress (2)
1,460.9

 
1,012.4

Total Property, Plant and Equipment, Net
$
22,537.3

 
$
21,350.5



(1) These assets are primarily comprised of building improvements, computer software, hardware and equipment at Eversource Service.
(2) As of September 30, 2017, the total CWIP related to NPT was approximately $201 million.
 
As of September 30, 2017
 
As of December 31, 2016
(Millions of Dollars)
CL&P
 
NSTAR
Electric
 
PSNH
 
WMECO
 
CL&P
 
NSTAR Electric
 
PSNH
 
WMECO
Distribution
$
5,797.6

 
$
5,543.1

 
$
2,048.8

 
$
868.1

 
$
5,562.9

 
$
5,402.3

 
$
1,949.8

 
$
841.9

Transmission
4,061.2

 
2,545.0

 
1,115.7

 
1,147.9

 
3,912.9

 
2,435.8

 
1,059.3

 
1,061.1

Generation
—

 
—

 
1,179.8

 
36.0

 
—

 
—

 
1,188.2

 
36.0

Property, Plant and Equipment, Gross
9,858.8

 
8,088.1

 
4,344.3

 
2,052.0

 
9,475.8

 
7,838.1

 
4,197.3

 
1,939.0

Less:  Accumulated Depreciation
(2,207.0
)
 
(2,143.8
)
 
(1,315.7
)
 
(356.5
)
 
(2,082.4
)
 
(2,025.4
)
 
(1,254.7
)
 
(338.8
)
Property, Plant and Equipment, Net
7,651.8

 
5,944.3

 
3,028.6

 
1,695.5

 
7,393.4

 
5,812.7

 
2,942.6

 
1,600.2

Construction Work in Progress
456.2

 
324.4

 
139.3

 
74.1

 
239.0

 
239.1

 
96.7

 
78.1

Total Property, Plant and Equipment, Net
$
8,108.0

 
$
6,268.7

 
$
3,167.9

 
$
1,769.6

 
$
7,632.4

 
$
6,051.8

 
$
3,039.3

 
$
1,678.3