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COMMITMENTS AND CONTINGENCIES (Tables)
 12 Months Ended
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Environmental Loss Contingencies by Site
The number of environmental sites and related reserves for which remediation or long-term monitoring, preliminary site work or site assessment is being performed are as follows:
 
As of December 31, 2016
 
As of December 31, 2015
 
Number of Sites
 
Reserve
(in millions)
 
Number of Sites
 
Reserve
(in millions)
Eversource
61

 
$
65.8

 
64

 
$
51.1

CL&P
14

 
4.9

 
14

 
4.6

NSTAR Electric
13

 
3.2

 
15

 
2.4

PSNH
11

 
5.3

 
12

 
4.5

WMECO
4

 
0.6

 
4

 
0.6

A reconciliation of the activity in the environmental reserves is as follows:
(Millions of Dollars)
Eversource
 
CL&P
 
NSTAR Electric
 
PSNH
 
WMECO
Balance as of January 1, 2015
$
43.3

 
$
3.8

 
$
1.1

 
$
5.2

 
$
0.5

Additions
13.5

 
1.3

 
2.0

 
2.3

 
0.2

Payments/Reductions
(5.7
)
 
(0.5
)
 
(0.7
)
 
(3.0
)
 
(0.1
)
Balance as of December 31, 2015
51.1

 
4.6

 
2.4

 
4.5

 
0.6

Additions
20.6

 
0.6

 
1.7

 
1.2

 
0.1

Payments/Reductions
(5.9
)
 
(0.3
)
 
(0.9
)
 
(0.4
)
 
(0.1
)
Balance as of December 31, 2016
$
65.8

 
$
4.9

 
$
3.2

 
$
5.3

 
$
0.6
Long-term Purchase Commitment
The estimated future annual costs of significant long-term contractual arrangements as of December 31, 2016 are as follows:
Eversource
 
 
 
 
 
 
 
 
 
 
 
 
 
(Millions of Dollars)
2017
 
2018
 
2019
 
2020
 
2021
 
Thereafter
 
Total
Supply and Stranded Cost
$
115.8

 
$
81.6

 
$
69.4

 
$
74.2

 
$
58.4

 
$
189.8

 
589.2

Renewable Energy
275.4

 
242.6

 
240.9

 
238.8

 
218.9

 
1,864.1

 
3,080.7

Peaker CfDs
42.3

 
21.5

 
21.7

 
31.1

 
27.6

 
54.2

 
198.4

Natural Gas Procurement
197.0

 
185.5

 
142.3

 
115.0

 
104.9

 
190.2

 
934.9

Coal, Wood and Other
15.5

 
3.9

 
1.9

 
1.9

 
1.9

 
11.3

 
36.4

Transmission Support Commitments
21.8

 
22.0

 
22.2

 
22.2

 
22.2

 
22.2

 
132.6

Total
$
667.8

 
$
557.1

 
$
498.4

 
$
483.2

 
$
433.9

 
$
2,331.8

 
$
4,972.2

CL&P
 
 
 
 
 
 
 
 
 
 
 
 
 
(Millions of Dollars)
2017
 
2018
 
2019
 
2020
 
2021
 
Thereafter
 
Total
Supply and Stranded Cost
$
93.4

 
$
58.7

 
$
56.6

 
$
68.8

 
$
53.0

 
$
162.3

 
$
492.8

Renewable Energy
77.9

 
80.4

 
80.3

 
80.3

 
80.6

 
684.4

 
1,083.9

Peaker CfDs
42.3

 
21.5

 
21.7

 
31.1

 
27.6

 
54.2

 
198.4

Transmission Support Commitments
8.6

 
8.7

 
8.8

 
8.8

 
8.8

 
8.8

 
52.5

Total
$
222.2

 
$
169.3

 
$
167.4

 
$
189.0

 
$
170.0

 
$
909.7

 
$
1,827.6

NSTAR Electric
 
 
 
 
 
 
 
 
 
 
 
 
 
(Millions of Dollars)
2017
 
2018
 
2019
 
2020
 
2021
 
Thereafter
 
Total
Supply and Stranded Cost
$
4.8

 
$
5.5

 
$
5.5

 
$
3.1

 
$
3.1

 
$
25.0

 
$
47.0

Renewable Energy
116.8

 
80.4

 
78.5

 
76.6

 
72.1

 
416.7

 
841.1

Transmission Support Commitments
6.8

 
6.8

 
6.9

 
6.9

 
6.9

 
6.9

 
41.2

Total
$
128.4

 
$
92.7

 
$
90.9

 
$
86.6

 
$
82.1

 
$
448.6

 
$
929.3

PSNH
 
 
 
 
 
 
 
 
 
 
 
 
 
(Millions of Dollars)
2017
 
2018
 
2019
 
2020
 
2021
 
Thereafter
 
Total
Supply and Stranded Cost
$
17.6

 
$
17.4

 
$
7.3

 
$
2.3

 
$
2.3

 
$
2.5

 
$
49.4

Renewable Energy
65.2

 
66.1

 
66.3

 
65.9

 
50.1

 
601.9

 
915.5

Coal, Wood and Other
15.5

 
3.9

 
1.9

 
1.9

 
1.9

 
11.3

 
36.4

Transmission Support Commitments
4.6

 
4.7

 
4.7

 
4.7

 
4.7

 
4.7

 
28.1

Total
$
102.9

 
$
92.1

 
$
80.2

 
$
74.8

 
$
59.0

 
$
620.4

 
$
1,029.4

WMECO
 
 
 
 
 
 
 
 
 
 
 
 
 
(Millions of Dollars)
2017
 
2018
 
2019
 
2020
 
2021
 
Thereafter
 
Total
Renewable Energy
$
15.5

 
$
15.7

 
$
15.8

 
$
16.0

 
$
16.1

 
$
161.1

 
$
240.2

Transmission Support Commitments
1.8

 
1.8

 
1.8

 
1.8

 
1.8

 
1.8

 
10.8

Total
$
17.3

 
$
17.5

 
$
17.6

 
$
17.8

 
$
17.9

 
$
162.9

 
$
251.0

The total costs incurred under these agreements were as follows:
Eversource
For the Years Ended December 31,
(Millions of Dollars)
2016
 
2015
 
2014
Supply and Stranded Cost
$
152.5

 
$
147.6

 
$
99.2

Renewable Energy
210.9

 
144.3

 
114.4

Peaker CfDs
47.7

 
42.7

 
18.1

Natural Gas Procurement
323.9

 
428.6

 
482.5

Coal, Wood and Other
55.7

 
95.9

 
120.5

Transmission Support Commitments
15.9

 
25.3

 
25.0

 
For the Years Ended December 31,
 
2016
 
2015
 
2014
(Millions of Dollars)
CL&P
 
NSTAR
Electric
 
PSNH
 
WMECO
 
CL&P
 
NSTAR
Electric
 
PSNH
 
WMECO
 
CL&P
 
NSTAR
Electric
 
PSNH
 
WMECO
Supply and Stranded Cost
$
132.7

 
$
0.7

 
$
19.1

 
$
—

 
$
120.3

 
$
6.5

 
$
20.8

 
$
—

 
$
63.0

 
$
7.0

 
$
26.0

 
$
3.2

Renewable Energy
42.1

 
93.6

 
67.7

 
7.5

 
20.0

 
86.7

 
37.2

 
0.4

 
0.7

 
87.4

 
26.3

 
—

Peaker CfDs
47.7

 
—

 
—

 
—

 
42.7

 
—

 
—

 
—

 
18.1

 
—

 
—

 
—

Coal, Wood and Other
—

 
—

 
55.7

 
—

 
—

 
—

 
95.9

 
—

 
—

 
—

 
120.5

 
—

Transmission Support
  Commitments
6.3

 
4.9

 
3.4

 
1.3

 
10.0

 
7.8

 
5.4

 
2.1

 
9.9

 
7.7

 
5.3

 
2.1
Schedule of Guarantor Obligations
The following table summarizes Eversource parent's exposure to guarantees and indemnifications of its subsidiaries to external parties, as of December 31, 2016:
Company
 
Description
 
Maximum Exposure
(in millions)
 
Expiration Dates
On behalf of subsidiaries:
 
 
 
 
 
 
Eversource Gas Transmission LLC
 
Access Northeast Project Capital Contributions Guaranty
 
$
185.4

 
2021
Various
 
Surety Bonds (1)
 
$
38.2

 
2017 - 2018
Eversource Service and Rocky River Realty Company
 
Lease Payments for Vehicles and Real Estate
 
$
9.2

 
2019 - 2024

(1) 
Surety bond expiration dates reflect termination dates, the majority of which will be renewed or extended.  Certain surety bonds contain credit ratings triggers that would require Eversource parent to post collateral in the event that the unsecured debt credit ratings of Eversource parent are downgraded.