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PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION (Tables)
 3 Months Ended
Mar. 31, 2018
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 March 31, 2018
 
As of December 31, 2017
(Millions of Dollars)
 
Distribution - Electric
$
14,511.0

 
$
14,410.5

Distribution - Natural Gas
3,273.2

 
3,244.2

Transmission - Electric
9,420.9

 
9,270.9

Distribution - Water
1,556.4

 
1,558.4

Generation and Solar (1)
36.2

 
36.2

Utility
28,797.7

 
28,520.2

Other (2)
698.4

 
693.7

Property, Plant and Equipment, Gross
29,496.1

 
29,213.9

Less:  Accumulated Depreciation
 
 
 
Utility   
(6,927.5
)
 
(6,846.9
)
Other
(300.0
)
 
(286.9
)
Total Accumulated Depreciation
(7,227.5
)
 
(7,133.8
)
Property, Plant and Equipment, Net
22,268.6

 
22,080.1

Construction Work in Progress
1,690.1

 
1,537.4

Total Property, Plant and Equipment, Net
$
23,958.7

 
$
23,617.5


 
As of March 31, 2018
 
As of December 31, 2017
(Millions of Dollars)
CL&P
 
NSTAR
Electric
 
PSNH
 
CL&P
 
NSTAR
Electric
 
PSNH
Distribution
$
5,939.9

 
$
6,532.5

 
$
2,078.9

 
$
5,888.3

 
$
6,479.0

 
$
2,083.4

Transmission
4,322.6

 
3,842.7

 
1,207.1

 
4,239.9

 
3,821.2

 
1,161.3

Generation and Solar (1)
—

 
36.2

 
—

 
—

 
36.2

 
—

Property, Plant and Equipment, Gross
10,262.5

 
10,411.4

 
3,286.0

 
10,128.2

 
10,336.4

 
3,244.7

Less:  Accumulated Depreciation
(2,274.4
)
 
(2,599.3
)
 
(734.9
)
 
(2,239.0
)
 
(2,550.2
)
 
(751.8
)
Property, Plant and Equipment, Net
7,988.1

 
7,812.1

 
2,551.1

 
7,889.2

 
7,786.2

 
2,492.9

Construction Work in Progress
418.5

 
511.7

 
142.9

 
381.8

 
460.3

 
149.4

Total Property, Plant and Equipment, Net
$
8,406.6

 
$
8,323.8

 
$
2,694.0

 
$
8,271.0

 
$
8,246.5

 
$
2,642.3



(1) 
On January 10, 2018, PSNH completed the sale of its thermal generation assets, pursuant to an agreement dated October 11, 2017. PSNH expects to complete the sale of its hydroelectric generation assets, pursuant to the agreement dated October 11, 2017, in the second quarter of 2018. As of March 31, 2018 and December 31, 2017, PSNH has classified its generation assets as held for sale. See Note 9, "Assets Held for Sale," for further information.

(2) 
These assets are primarily comprised of building improvements, computer software, hardware and equipment at Eversource Service.