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LEASES (Tables)
 12 Months Ended
Dec. 31, 2017
Leases [Abstract]  
Schedule of Rent Expense
Operating lease rental payments charged to expense are as follows:
(Millions of Dollars)
Eversource
 
CL&P
 
NSTAR Electric
 
PSNH
2017
$
10.5

 
$
11.7

 
$
11.3

 
$
3.3

2016
12.1

 
12.5

 
11.4

 
2.9

2015
12.1

 
12.5

 
11.8

 
2.8
Schedule of Future Minimum Lease Payments for Capital Leases
Future minimum rental payments, excluding executory costs, such as property taxes, state use taxes, insurance, and maintenance, under long-term noncancelable leases, as of December 31, 2017 are as follows:
Operating Leases
(Millions of Dollars)
Eversource
 
CL&P
 
NSTAR Electric
 
PSNH
2018
$
13.2

 
$
1.8

 
$
7.9

 
$
1.0

2019
11.4

 
1.5

 
6.9

 
1.0

2020
10.0

 
1.3

 
6.1

 
0.9

2021
8.9

 
1.1

 
5.5

 
0.8

2022
7.4

 
1.0

 
4.5

 
0.6

Thereafter
19.7

 
1.0

 
15.4

 
2.0

Future minimum lease payments
$
70.6

 
$
7.7

 
$
46.3

 
$
6.3
Schedule of Future Minimum Rental Payments for Operating Leases
Capital Leases
(Millions of Dollars)
Eversource
 
CL&P
 
NSTAR Electric
 
PSNH
2018
$
2.9

 
$
2.0

 
$
0.5

 
$
0.1

2019
3.3

 
2.0

 
0.6

 
—

2020
3.3

 
2.0

 
0.5

 
—

2021
2.8

 
1.4

 
0.6

 
—

2022
1.3

 
—

 
0.6

 
—

Thereafter
2.5

 
—

 
2.5

 
—

Future minimum lease payments
16.1

 
7.4

 
5.3

 
0.1

Less amount representing interest
3.1

 
1.7

 
1.2

 
—

Present value of future minimum lease payments
$
13.0

 
$
5.7

 
$
4.1

 
$
0.1