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COMMITMENTS AND CONTINGENCIES (Tables)
 6 Months Ended
Jun. 30, 2020
Commitments and Contingencies Disclosure [Abstract]  
Environmental Sites and Related Reserves
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 June 30, 2020
 
As of December 31, 2019
 
Number of Sites
 
Reserve
(in millions)
 
Number of Sites
 
Reserve
(in millions)
Eversource
55

 
$
78.5

 
57

 
$
81.0

CL&P
15

 
11.2

 
15

 
11.4

NSTAR Electric
13

 
5.8

 
15

 
8.0

PSNH
9

 
7.3

 
9

 
7.5
Summary of Exposure to Guarantees and Indemnifications The following table summarizes Eversource parent's exposure to guarantees and indemnifications of its subsidiaries and affiliates to external parties as of June 30, 2020:  
Company
 
Description
 
Maximum Exposure
(in millions)
 
Expiration Dates
Various
 
Surety Bonds (1)
 
$
30.9

 
2020 - 2023
Rocky River Realty Company and Eversource Service
 
Lease Payments for Real Estate
 
5.9

 
2024
Bay State Wind LLC
 
Real Estate Purchase
 
2.5

 
2021
Sunrise Wind LLC
 
Offshore Wind (2)
 
2.2

 
-

(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.  

(2) 
On October 25, 2019, Eversource parent issued a guaranty on behalf of its 50 percent-owned affiliate, Sunrise Wind LLC, whereby Eversource parent will guaranty Sunrise Wind LLC’s performance of certain obligations, in an amount not to exceed $15.4 million, under the Offshore Wind Renewable Energy Certificate Purchase and Sale Agreement (the Agreement). The Agreement was executed on October 23, 2019, by and between the New York State Energy Research and Development Authority (NYSERDA) and Sunrise Wind LLC. The Company regularly reviews performance risk under this arrangement, and in the event it becomes probable that Eversource parent will be required to perform under the guarantee, the amount of probable payment will be recorded. As of June 30, 2020, the fair value of the guarantee was immaterial.