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COMMITMENTS AND CONTINGENCIES (Tables)
 9 Months Ended
Sep. 30, 2024
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 September 30, 2024As of December 31, 2023
Number of SitesReserve
(in millions)		Number of SitesReserve
(in millions)
Eversource65 $130.5 65 $128.2 
CL&P15 13.7 16 13.8 
NSTAR Electric13 6.7 12 5.4 
PSNH8 6.4 8 7.6 
Schedule of Estimated Future Annual Costs of Long term Contractual Agreement The table now includes the long-term commitments of CL&P pertaining to renewable energy purchase contracts that have now commenced significant construction activities.
CL&P      
(Millions of Dollars)20242025202620272028ThereafterTotal
Renewable Energy$208.8 $666.4 $743.5 $745.9 $747.6 $4,016.7 $7,128.9 
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, and primarily relates to its previously-owned offshore wind investments:  
As of September 30, 2024
Company (Obligor)DescriptionMaximum Exposure
(in millions)
North East Offshore, LLC, Revolution Wind, LLC, and TurbineCo, LLC
Offshore wind construction-related purchase agreements with third-party contractors (1)
$455.3 
Eversource Investment LLC, Eversource Investment Service Company LLC and South Fork Class B Member, LLC
Offshore wind funding and indemnification obligations (2)
351.1 
Eversource Investment LLC
Letters of Credit (3)
5.3 
Eversource TEI LLC
South Fork Wind Tax Equity (4)
50.0 
South Fork Wind, LLC
Power Purchase Agreement Security (5)
7.1 
Various Eversource subsidiaries
Surety bonds (6)
31.1 

(1)    Eversource parent issued guarantees on behalf of its previously 50 percent-owned affiliate, Revolution Wind, LLC, and on behalf of TurbineCo, LLC (successor in interest to North East Offshore, LLC (NEO)), under which Eversource parent agreed to guarantee each entity’s performance of obligations under certain construction-related purchase agreements with third-party contractors, in an aggregate amount not to exceed $1.09 billion. Eversource parent’s obligations under the guarantees expire upon the earlier of (i) dates ranging between October 2024 and November 2027 and (ii) full performance of the guaranteed obligations. 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 and expiring upon full performance of the guaranteed obligation.
(2)     Eversource parent issued guarantees on behalf of its wholly-owned subsidiary Eversource Investment LLC (EI), which held Eversource's previous investments in offshore wind-related equity method investments until sale, and on behalf of its previously 50 percent-owned affiliate, South Fork Class B Member, LLC, whereby Eversource parent will guarantee each entity’s performance of certain funding obligations of the South Fork and Revolution Wind projects. Eversource parent also guaranteed certain indemnification obligations of EI associated with third party credit support for EI’s investment in NEO. On September 30, 2024, Eversource parent issued a guaranty on behalf of its wholly-owned subsidiary, Eversource Investment Service Company LLC, whereby Eversource parent will guarantee Eversource Investment Service Company LLC’s performance of certain indemnification obligations during the onshore construction phase of the Revolution Wind project, in an amount not to exceed $100.0 million. These guarantees will not exceed $1.62 billion and expire upon the full performance of the guaranteed obligations.

(3)    Eversource parent entered into a guarantee on behalf of EI, under which Eversource parent would guarantee EI's obligations under a letter of credit facility with a financial institution that EI may request in an aggregate amount of up to approximately $25 million. As of September 30, 2024, EI has issued letters of credit on behalf of South Fork Wind, LLC and Revolution Wind, LLC totaling $5.3 million. The guarantee will remain in effect until full performance of the guaranteed obligations.

(4)    Eversource parent issued a guarantee on behalf of its wholly-owned subsidiary, Eversource TEI LLC, whereby Eversource parent will guarantee Eversource TEI LLC’s performance of certain obligations, in an amount not to exceed $50.0 million, in connection with any remaining obligations under the LLC agreement. Eversource parent’s obligations expire upon the full performance of the guaranteed obligations.

(5)    Eversource parent issued a guarantee on behalf of its previously 50 percent-owned affiliate, South Fork Wind, LLC, whereby Eversource parent will guarantee South Fork Wind, LLC's performance of certain obligations, in an amount not to exceed $7.1 million, under a Power Purchase Agreement between the Long Island Power Authority and South Fork Wind, LLC (the Agreement). The guarantee expires upon the later of (i) the end of the Agreement term and (ii) full performance of the guaranteed obligations.

(6)    Surety bonds expire in 2024 and 2025. 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.