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COMMITMENTS AND CONTINGENCIES (Tables)
6 Months Ended
Jun. 30, 2021
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, 2021As of December 31, 2020
Number of SitesReserve
(in millions)
Number of SitesReserve
(in millions)
Eversource62 $108.8 63 $102.4 
CL&P14 10.7 15 12.3 
NSTAR Electric12 3.9 12 4.7 
PSNH6.6 7.1 
Non-Cancelable Commitments under Purchase Commitment Contracts Renewable energy contracts include non-cancelable commitments under contracts of NSTAR Electric for the purchase of energy and RECs from renewable energy facilities.
NSTAR Electric      
(Millions of Dollars)20212022202320242025ThereafterTotal
Renewable Energy$48.1 $103.6 $229.3 $339.4 $346.2 $6,527.7 $7,594.3 
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, 2021
Company (Obligor)DescriptionMaximum Exposure
(in millions)
Expiration Dates
North East Offshore LLC
Construction-related purchase agreements with third-party contractors (1)
$29.7 
 (1)
Eversource Investment LLC
Funding and indemnification obligations of North East Offshore LLC (2)
— 
 (2)
Sunrise Wind LLC
OREC capacity production (3)
2.2 
 (3)
South Fork Wind, LLC
Transmission interconnection
1.6 
Bay State Wind LLCReal estate purchase2.5 2022
Various
Surety bonds (4)
59.5 2021 - 2023
Rocky River Realty Company and
   Eversource Service
Lease payments for real estate4.4 2024

(1)    Eversource parent issued guarantees on behalf of its 50 percent-owned affiliate, North East Offshore LLC (NEO), under which Eversource parent agreed to guarantee 50 percent of NEO’s performance of obligations under certain purchase agreements with third-party contactors, in an amount not to exceed $1.3 billion with an expiration date in 2025. Eversource parent also issued a separate guarantee to Ørsted on behalf of NEO, under which Eversource parent agreed to guarantee 50 percent of NEO’s payment obligations under certain offshore wind project construction-related agreements with Ørsted in an aggregate amount not to exceed $62.5 million. Any amounts paid under this guarantee to Ørsted will count toward, but not increase, the maximum amount of the Funding Guarantee described in Note 2, below. The guarantee expires upon the full performance of the guaranteed obligations.    

(2)    Eversource parent issued a guarantee (Funding Guarantee) on behalf of Eversource Investment LLC (EI), its wholly-owned subsidiary that holds a 50 percent ownership interest in NEO, under which Eversource parent agreed to guarantee certain funding obligations and certain indemnification payments of EI under the Amended and Restated Limited Liability Company Operating Agreement of NEO, in an amount not to exceed $910 million. The guaranteed obligations include payment of EI's funding obligations during the construction phase of NEO’s underlying offshore wind projects and indemnification obligations associated with third party credit support for its investment in NEO. Eversource parent’s obligations under the Funding Guarantee expire upon the full performance of the guaranteed obligations.

(3)    Eversource parent issued a guarantee on behalf of its 50 percent-owned affiliate, Sunrise Wind LLC, whereby Eversource parent will guarantee 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 guarantee expires upon the full performance of the guaranteed obligations.    
(4)    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.