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COMMITMENTS AND CONTINGENCIES (Tables)
 9 Months Ended
Sep. 30, 2019
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 September 30, 2019
 
As of December 31, 2018
 
Number of Sites
 
Reserve
(in millions)
 
Number of Sites
 
Reserve
(in millions)
Eversource
58

 
$
70.3

 
60

 
$
64.7

CL&P
15

 
6.0

 
15

 
5.4

NSTAR Electric
15

 
9.5

 
16

 
10.9

PSNH
9

 
5.7

 
9

 
5.4
Summary of Exposure to Guarantees and Indemnifications  The following table summarizes Eversource parent's exposure to guarantees and indemnifications of its subsidiaries to external parties, as of September 30, 2019:  
Company
 
Description
 
Maximum Exposure
(in millions)
 
Expiration Dates
On behalf of subsidiaries:
 
 
 
 
 
 
Various
 
Surety Bonds (1)
 
$
34.3

 
2019 - 2021
Rocky River Realty Company and Eversource Service
 
Lease Payments for Real Estate
 
6.8

 
2024
Bay State Wind
 
Real Estate Purchase
 
2.5

 
2020

(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.