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COMMITMENTS AND CONTINGENCIES (Tables) | 9 Months Ended
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Sep. 30, 2023
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, 2023 |  | As of December 31, 2022
| Number of Sites |  | Reserve (in millions) |  | Number of Sites |  | Reserve (in millions)
Eversource | 63 |  |  | $ | 130.5 |  |  | 59 |  |  | $ | 122.6 |
CL&P | 14 |  |  | 12.6 |  |  | 13 |  |  | 13.9 |
NSTAR Electric | 12 |  |  | 5.4 |  |  | 10 |  |  | 3.4 |
PSNH | 8 |  |  | 7.7 |  |  | 8 |  |  | 6.1 |
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 offshore wind business:
As of September 30, 2023
Company (Obligor) |  | Description |  | Maximum Exposure (in millions) |  | Expiration Dates
North East Offshore |  | Construction-related purchase agreements with third-party contractors (1) |  | $ | 705.8 |  |  | (1)
Sunrise Wind LLC |  | Construction-related purchase agreements with third-party contractors (2) |  | 823.3 |  |  | 2025 - 2028
Revolution Wind, LLC |  | Construction-related purchase agreements with third-party contractors (3) |  | 381.1 |  |  | 2024 - 2027
South Fork Wind, LLC |  | Construction-related purchase agreements with third-party contractors (4) |  | 55.5 |  |  | 2023 - 2026
Eversource Investment LLC |  | Funding and indemnification obligations of South Fork Wind (5) |  | 77.4 |  |  | (5)
South Fork Class B Member, LLC |  | Funding and indemnification obligations of South Fork Wind (6) |  | 77.4 |  |  | (6)
Eversource Investment LLC |  | Funding and indemnification obligations of North East Offshore (7) |  | 29.8 |  |  | (7)
South Fork Wind, LLC |  | Power Purchase Agreement Security (8) |  | 7.1 |  |  | (8)
Sunrise Wind LLC |  | OREC capacity production (9) |  | 11.0 |  |  | (9)
Bay State Wind LLC |  | Real estate purchase |  | 2.5 |  |  | 2024
South Fork Wind, LLC |  | Transmission interconnection |  | 1.2 |  |  | —
Eversource Investment LLC |  | Letters of Credit (10) |  | 15.2 |  |  | —
Eversource TEI LLC |  | South Fork Wind Tax Equity (11) |  | — |  |  | (11)
Various |  | Surety bonds (12) |  | 38.8 |  |  | 2023 - 2024
Eversource Service |  | Lease payments for real estate |  | 0.3 |  |  | 2024
(1) Eversource parent issued guarantees on behalf of its 50 percent-owned affiliate, North East Offshore (NEO), under which Eversource parent agreed to guarantee 50 percent of NEO’s performance of obligations under certain purchase agreements with third-party contractors, 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 7, below. (2) Eversource parent issued guarantees 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 $1.06 billion, in connection with construction-related purchase agreements. Eversource parent’s obligations under the guarantees expire upon the earlier of (i) dates ranging from March 2025 and October 2028 and (ii) full performance of the guaranteed obligations. (3) Eversource parent issued guarantees 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 $546.4 million, in connection with construction-related purchase agreements. Eversource parent’s obligations under the guarantees expire upon the earlier of (i) dates ranging from May 2024 and November 2027 and (ii) full performance of the guaranteed obligations. (4) Eversource parent issued 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 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 $161.0 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 on behalf of its wholly-owned subsidiary Eversource Investment LLC (EI), which holds Eversource's investments in offshore wind-related equity method investments, whereby Eversource parent will guarantee EI’s performance of certain obligations, in an amount not to exceed $110.0 million, primarily in connection with capital expenditure funding obligations during the construction phase of the South Fork Wind project. Eversource parent obligations expire upon the full performance of the guaranteed obligations. (6) Eversource parent issued a guarantee on behalf of its 50 percent-owned affiliate, South Fork Class B Member, LLC, whereby Eversource parent will guarantee South Fork Class B Member, LLC’s performance of certain obligations, in an amount not to exceed $499.5 million, primarily in connection with capital expenditure funding obligations during the construction phase of the South Fork Wind project. Eversource parent obligations expire upon the full performance of the guaranteed obligations. (7) Eversource parent issued a guarantee (Funding Guarantee) on behalf of EI, under which Eversource parent agreed to guarantee certain funding obligations and certain indemnification payments of EI under the 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. (8) 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. (9) 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. (10) On September 16, 2020, 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. In January 2022, EI issued two letters of credit on behalf of South Fork Wind, LLC related to future decommissioning obligations of certain onshore transmission assets totaling $4.3 million. In June 2023, EI issued a letter of credit on behalf of Sunrise Wind LLC related to future environmental remediation in the amount of $9.9 million. In September 2023, EI issued a letter of credit on behalf of Revolution Wind, LLC related to onshore transmission construction in the amount of $1.0 million. (11) 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 obligations expire upon the full performance of the guaranteed obligations. (12) 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.

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- Definition Tabular disclosure of environmental loss contingencies by individual site. Does not include loss contingencies that are not environmental in nature. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.Y.Q1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480102/450-20-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.Y.Q2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480102/450-20-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481931/410-30-50-10 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Subparagraph (d)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481931/410-30-50-10 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Subparagraph (d)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481931/410-30-50-10 + Details
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- Definition Tabular disclosure of each guarantee obligation, or each group of similar guarantee obligations, including (a) the nature of the guarantee, including its term, how it arose, and the events or circumstances that would require the guarantor to perform under the guarantee; (b) the maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee; (c) the current carrying amount of the liability, if any, for the guarantor's obligations under the guarantee; and (d) the nature of any recourse provisions under the guarantee, and any assets held either as collateral or by third parties, and any relevant related party disclosure. Excludes disclosures about product warranties. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482425/460-10-50-4 + Details
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