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PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION (Tables)
 3 Months Ended
Mar. 31, 2017
Property, Plant and Equipment [Abstract]  
Public Utility Property, Plant, and Equipment
The following tables summarize utility property, plant and equipment by asset category:
Eversource
As of March 31, 2017
 
As of December 31, 2016
(Millions of Dollars)
 
Distribution - Electric
$
13,893.9

 
$
13,716.9

Distribution - Natural Gas
3,049.3

 
3,010.4

Transmission - Electric
8,600.1

 
8,517.4

Generation
1,225.6

 
1,224.2

Electric and Natural Gas Utility
26,768.9

 
26,468.9

Other (1)
585.1

 
591.6

Property, Plant and Equipment, Gross
27,354.0

 
27,060.5

Less:  Accumulated Depreciation
 
 
 
Electric and Natural Gas Utility   
(6,607.5
)
 
(6,480.4
)
Other
(251.3
)
 
(242.0
)
Total Accumulated Depreciation
(6,858.8
)
 
(6,722.4
)
Property, Plant and Equipment, Net
20,495.2

 
20,338.1

Construction Work in Progress
1,146.7

 
1,012.4

Total Property, Plant and Equipment, Net
$
21,641.9

 
$
21,350.5



(1) These assets are primarily comprised of building improvements, computer software, hardware and equipment at Eversource Service.
 
As of March 31, 2017
 
As of December 31, 2016
(Millions of Dollars)
CL&P
 
NSTAR
Electric
 
PSNH
 
WMECO
 
CL&P
 
NSTAR Electric
 
PSNH
 
WMECO
Distribution
$
5,628.7

 
$
5,471.5

 
$
1,981.9

 
$
851.8

 
$
5,562.9

 
$
5,402.3

 
$
1,949.8

 
$
841.9

Transmission
3,930.1

 
2,462.8

 
1,075.5

 
1,083.4

 
3,912.9

 
2,435.8

 
1,059.3

 
1,061.1

Generation
—

 
—

 
1,189.6

 
36.0

 
—

 
—

 
1,188.2

 
36.0

Property, Plant and Equipment, Gross
9,558.8

 
7,934.3

 
4,247.0

 
1,971.2

 
9,475.8

 
7,838.1

 
4,197.3

 
1,939.0

Less:  Accumulated Depreciation
(2,125.4
)
 
(2,064.4
)
 
(1,277.7
)
 
(347.0
)
 
(2,082.4
)
 
(2,025.4
)
 
(1,254.7
)
 
(338.8
)
Property, Plant and Equipment, Net
7,433.4

 
5,869.9

 
2,969.3

 
1,624.2

 
7,393.4

 
5,812.7

 
2,942.6

 
1,600.2

Construction Work in Progress
321.5

 
239.0

 
107.3

 
70.6

 
239.0

 
239.1

 
96.7

 
78.1

Total Property, Plant and Equipment, Net
$
7,754.9

 
$
6,108.9

 
$
3,076.6

 
$
1,694.8

 
$
7,632.4

 
$
6,051.8

 
$
3,039.3

 
$
1,678.3