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COMMITMENTS AND CONTINGENCIES (Tables)
 12 Months Ended
Dec. 31, 2021
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, 2020$81.0 $11.4 $8.0 $7.5 
Increase Due to CMA Asset Acquisition22.9 — — — 
Additions8.4 4.2 0.7 — 
Payments/Reductions(9.9)(3.3)(4.0)(0.4)
Balance as of December 31, 2020102.4 12.3 4.7 7.1 
Additions23.4 4.4 — — 
Payments/Reductions(10.4)(2.8)(1.4)(0.8)
Balance as of December 31, 2021$115.4 $13.9 $3.3 $6.3 

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
20216114119
20206315129
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, 2021 are as follows:
Eversource       
(Millions of Dollars)20222023202420252026ThereafterTotal
Renewable Energy$755.4 $700.7 $696.4 $718.7 $714.3 $3,571.4 $7,156.9 
Natural Gas Procurement377.9 323.6 270.5 265.5 250.4 1,517.2 3,005.1 
Purchased Power and Capacity76.0 87.1 86.7 75.1 2.9 9.8 337.6 
Peaker CfDs26.1 38.9 39.4 36.7 29.9 63.3 234.3 
Transmission Support Commitments16.0 17.8 20.6 22.4 22.6 22.6 122.0 
Total$1,251.4 $1,168.1 $1,113.6 $1,118.4 $1,020.1 $5,184.3 $10,855.9 
CL&P       
(Millions of Dollars)20222023202420252026ThereafterTotal
Renewable Energy$586.2 $592.1 $592.0 $593.9 $591.9 $2,752.2 $5,708.3 
Purchased Power and Capacity72.1 83.4 83.8 72.3 0.1 — 311.7 
Peaker CfDs26.1 38.9 39.4 36.7 29.9 63.3 234.3 
Transmission Support Commitments6.3 7.0 8.1 8.8 8.9 8.9 48.0 
Total$690.7 $721.4 $723.3 $711.7 $630.8 $2,824.4 $6,302.3 
NSTAR Electric       
(Millions of Dollars)20222023202420252026ThereafterTotal
Renewable Energy$102.9 $78.3 $75.7 $76.1 $76.4 $492.3 $901.7 
Purchased Power and Capacity3.0 2.9 2.9 2.8 2.8 9.8 24.2 
Transmission Support Commitments6.3 7.0 8.1 8.9 8.9 8.9 48.1 
Total$112.2 $88.2 $86.7 $87.8 $88.1 $511.0 $974.0 
PSNH       
(Millions of Dollars)20222023202420252026ThereafterTotal
Renewable Energy$66.3 $30.3 $28.7 $48.7 $46.0 $326.9 $546.9 
Purchased Power and Capacity0.9 0.8 — — — — 1.7 
Transmission Support Commitments3.4 3.8 4.4 4.7 4.8 4.8 25.9 
Total$70.6 $34.9 $33.1 $53.4 $50.8 $331.7 $574.5 
The total costs incurred under these agreements were as follows:
EversourceFor the Years Ended December 31,
(Millions of Dollars)202120202019
Renewable Energy$609.2 $584.2 $320.8 
Natural Gas Procurement712.7 453.4 448.5 
Purchased Power and Capacity56.4 62.7 62.1 
Peaker CfDs24.3 22.7 13.0 
Transmission Support Commitments15.4 22.1 21.8 
 For the Years Ended December 31,
 202120202019
(Millions of Dollars)CL&PNSTAR
Electric		PSNHCL&PNSTAR
Electric		PSNHCL&PNSTAR
Electric		PSNH
Renewable Energy$457.1 $84.7 $67.4 $426.3 $88.8 $69.1 $160.6 $89.9 $70.3 
Purchased Power and Capacity53.1 3.0 0.3 59.3 3.1 0.3 50.4 5.1 6.6 
Peaker CfDs24.3 — — 22.7 — — 13.0 — — 
Transmission Support Commitments6.1 6.0 3.3 8.7 8.7 4.7 8.6 8.6 4.6 
Schedule of Guarantor Obligations
The following table summarizes Eversource parent's exposure to guarantees and indemnifications of its subsidiaries and affiliates to external parties:
As of December 31, 2021
Company (Obligor)DescriptionMaximum Exposure
(in millions)		Expiration Dates
North East Offshore LLC
Construction-related purchase agreements with third-party contractors (1)
$1,080.6 
 (1)
Sunrise Wind LLC
Construction-related purchase agreements with third-party contractors (2)
382.3 
2026
Revolution Wind, LLC
Construction-related purchase agreements with third-party contractors (3)
150.9 2027
South Fork Wind, LLC
Construction-related purchase agreements with third-party contractors (4)
125.2 2023 - 2026
Eversource Investment LLC
Funding and indemnification obligations of North East Offshore LLC (5)
— 
 (5)
Sunrise Wind LLC
OREC capacity production (6)
2.2 
 (6)
Bay State Wind LLCReal estate purchase2.5 2022
South Fork Wind, LLC
Transmission interconnection
1.2 —
Various
Surety bonds (7)
54.7 2022 - 2023
Eversource ServiceLease payments for real estate0.8 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 aggregate 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 and expiring upon full performance of the guaranteed obligation. Any amounts paid under this guarantee to Ørsted will count toward, but not increase, the maximum amount of the Funding Guarantee described in Note 5, below. The guarantee expires upon the full performance of the guaranteed obligations.    

(2)     Eversource parent issued a guaranty 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 aggregate amount not to exceed $420.6 million, in connection with a construction-related purchase agreement. Eversource parent’s obligations under the guarantee expire upon the earlier of (i) April 2026 and (ii) full performance of the guaranteed obligations.

(3)    Eversource parent issued a guaranty on behalf of its 50 percent-owned affiliate, Revolution Wind, LLC, whereby Eversource parent will guarantee Revolution Wind, LLC's performance of certain obligations, in an aggregate amount not to exceed $158.9 million, in connection with a construction-related purchase agreement. Eversource parent’s obligations under the guarantee expire upon the earlier of (i) November 2027 and (ii) full performance of the guaranteed obligations.

(4)    Eversource parent issued three guarantees 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 connection with three construction-related purchase agreements. Under these guarantees, Eversource parent will guarantee South Fork Wind, LLC's performance of certain obligations, in a total aggregate amount not to exceed $137.2 million. Eversource parent’s obligations under these guarantees expire upon the earlier of (i) dates ranging from October 2023 and August 2026 and (ii) full performance of the guaranteed obligations.

(5)    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.

(6)    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.    
(7)    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.