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COMMITMENTS AND CONTINGENCIES (Tables)
 12 Months Ended
Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Environmental Loss Contingencies by Site A reconciliation of the activity in the environmental reserves is as follows:
(Millions of Dollars)EversourceCL&PNSTAR ElectricPSNH
Balance as of January 1, 2022$115.4 $13.9 $3.3 $6.3 
Additions12.6 0.9 0.4 0.5 
Payments/Reductions(5.4)(0.9)(0.3)(0.7)
Balance as of December 31, 2022122.6 13.9 3.4 6.1 
Additions16.8 2.6 2.5 1.7 
Payments/Reductions(11.2)(2.7)(0.5)(0.2)
Balance as of December 31, 2023$128.2 $13.8 $5.4 $7.6 

The number of environmental sites for which remediation or long-term monitoring, preliminary site work or site assessment is being performed are as follows:
EversourceCL&PNSTAR ElectricPSNH
20236516128
20225913108
Schedule of Estimated Future Annual Costs of Long term Contractual Agreement The estimated future annual costs of significant executed, non-cancelable, long-term contractual arrangements in effect as of December 31, 2023 are as follows:
Eversource       
(Millions of Dollars)20242025202620272028ThereafterTotal
Renewable Energy Purchase Contracts$769.4 $863.0 $867.9 $897.6 $893.1 $5,368.8 $9,659.8 
Natural Gas Procurement423.2 402.3 317.8 264.8 236.0 1,211.8 2,855.9 
Purchased Power and Capacity86.7 75.2 2.9 2.7 2.7 4.5 174.7 
Peaker CfDs17.2 14.1 12.8 9.1 6.8 43.7 103.7 
Transmission Support Commitments19.3 22.2 27.4 31.1 31.1 31.1 162.2 
Total$1,315.8 $1,376.8 $1,228.8 $1,205.3 $1,169.7 $6,659.9 $12,956.3 
CL&P       
(Millions of Dollars)20242025202620272028ThereafterTotal
Renewable Energy Purchase Contracts$618.8 $628.3 $628.0 $631.2 $632.2 $2,087.8 $5,226.3 
Purchased Power and Capacity83.8 72.4 0.1 — — — 156.3 
Peaker CfDs17.2 14.1 12.8 9.1 6.8 43.7 103.7 
Transmission Support Commitments7.6 8.8 10.8 12.3 12.3 12.3 64.1 
Total$727.4 $723.6 $651.7 $652.6 $651.3 $2,143.8 $5,550.4 
NSTAR Electric       
(Millions of Dollars)20242025202620272028ThereafterTotal
Renewable Energy Purchase Contracts$123.0 $202.9 $206.5 $209.3 $205.1 $2,983.5 $3,930.3 
Purchased Power and Capacity2.9 2.8 2.8 2.7 2.7 4.5 18.4 
Transmission Support Commitments7.6 8.7 10.8 12.3 12.3 12.3 64.0 
Total$133.5 $214.4 $220.1 $224.3 $220.1 $3,000.3 $4,012.7 
PSNH       
(Millions of Dollars)20242025202620272028ThereafterTotal
Renewable Energy Purchase Contracts$27.6 $31.8 $33.4 $57.1 $55.8 $297.5 $503.2 
Transmission Support Commitments4.1 4.7 5.8 6.5 6.5 6.5 34.1 
Total$31.7 $36.5 $39.2 $63.6 $62.3 $304.0 $537.3 
The total costs incurred under these agreements were as follows:
EversourceFor the Years Ended December 31,
(Millions of Dollars)202320222021
Renewable Energy Purchase Contracts$581.4 $678.1 $609.2 
Natural Gas Procurement695.8 1,042.8 712.7 
Purchased Power and Capacity69.0 61.6 56.4 
Peaker CfDs20.1 13.4 24.3 
Transmission Support Commitments14.2 12.7 15.4 
 For the Years Ended December 31,
 202320222021
(Millions of Dollars)CL&PNSTAR
Electric		PSNHCL&PNSTAR
Electric		PSNHCL&PNSTAR
Electric		PSNH
Renewable Energy Purchase Contracts$474.1 $60.0 $47.3 $513.2 $90.8 $74.1 $457.1 $84.7 $67.4 
Purchased Power and Capacity65.5 2.9 0.6 57.7 3.0 0.9 53.1 3.0 0.3 
Peaker CfDs20.1 — — 13.4 — — 24.3 — — 
Transmission Support Commitments5.6 5.6 3.0 5.0 5.0 2.7 6.1 6.0 3.3 
Schedule of Guarantor Obligations
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 offshore wind business:  
As of December 31, 2023
Company (Obligor)DescriptionMaximum Exposure
(in millions)
North East Offshore, LLC, Sunrise Wind LLC, Revolution Wind, LLC and South Fork Wind, LLC
Offshore wind construction-related purchase agreements with third-party contractors (1)
$1,941.1 
Eversource Investment LLC and South Fork Class B Member, LLC
Funding and indemnification obligations of South Fork Wind and North East Offshore, LLC (2)
485.9 
Sunrise Wind LLC
OREC capacity production (3)
11.0 
South Fork Wind, LLC
Power Purchase Agreement Security (4)
7.1 
Eversource Investment LLC
Letters of Credit (5)
15.2 
Eversource TEI LLC
South Fork Wind Tax Equity (6)
— 
Various
Surety bonds (7)
38.8 
Sunrise Wind LLC
Surety bonds (8)
20.5 

(1)    Eversource parent issued guarantees on behalf of its 50 percent-owned affiliates, North East Offshore, LLC (NEO), Sunrise Wind LLC, Revolution Wind, LLC and South Fork Wind, LLC, 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 $3.03 billion. Eversource parent’s obligations under the guarantees expire upon the earlier of (i) dates ranging between May 2024 and October 2028 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 holds Eversource's investments in offshore wind-related equity method investments, and on behalf of its 50 percent-owned affiliate, South Fork Class B Member, LLC, whereby Eversource parent will guarantee each entity’s performance of certain capital expenditure funding obligations during the construction phases of the South Fork Wind project and NEO’s underlying offshore wind projects. Eversource parent also guaranteed certain indemnification obligations of EI associated with third party credit support for EI’s investment in NEO. These guarantees will not exceed $1.52 billion and 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 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. Effective January 1, 2024, the maximum exposure under the guarantee increased from $11.0 million to $15.4 million.

(4)    Eversource parent issued a guarantee on behalf of its 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.

(5)    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 December 31, 2023, EI has issued letters of credit on behalf of South Fork Wind, LLC, Sunrise Wind LLC and Revolution Wind, LLC totaling $15.2 million. In January 2024, EI issued two additional letters of credit on behalf of Sunrise Wind LLC totaling $8.0 million. The guarantee will remain in effect until full performance of the guaranteed obligations.

(6)    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 $528.4 million, primarily in connection with tax equity funding obligations during the construction phase of the South Fork Wind project. Eversource parent’s obligations expire upon the full performance of the guaranteed obligations.

(7)    Surety bonds expire in 2024. 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.
(8)    In December 2023, Sunrise Wind LLC issued a surety bond related to future decommissioning obligations of certain onshore transmission assets in the amount of $20.5 million. The surety bond shall remain outstanding until full performance of the obligations.