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SHORT-TERM AND LONG-TERM DEBT (Tables) | 6 Months Ended
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Jun. 30, 2025
Debt Disclosure [Abstract] |
Borrowings Outstanding and Available under the Commercial Paper Programs | The amount of borrowings outstanding and available under the commercial paper programs were as follows:
| Borrowings Outstanding as of |  | Available Borrowing Capacity as of |  | Weighted-Average Interest Rate as of
| June 30, 2025 |  | December 31, 2024 |  | June 30, 2025 |  | December 31, 2024 |  | June 30, 2025 |  | December 31, 2024
(Millions of Dollars) |  |  |  |  |
Eversource Parent Commercial Paper Program | $ | 950.5 |  |  | $ | 1,538.0 |  |  | $ | 1,049.5 |  |  | $ | 462.0 |  |  | 4.78 | % |  | 4.76 | %
NSTAR Electric Commercial Paper Program | 430.0 |  |  | 504.8 |  |  | 220.0 |  |  | 145.2 |  |  | 4.57 | % |  | 4.55 | %
Summary of Long-Term Debt Issuance and Repayments | The following table summarizes long-term debt issuances and repayments:
(Millions of Dollars) | Interest Rate |  | Issuance/(Repayment) |  | Issue Date or Repayment Date |  | Maturity Date |  | Use of Proceeds for Issuance/ Repayment Information
CL&P Series A First Mortgage Bonds | 4.95 | % |  | $ | 400.0 |  |  | January 2025 |  | January 2030 |  | Repaid short-term debt, paid capital expenditures and working capital
NSTAR Electric Debentures | 4.85 | % |  | 400.0 |  |  | February 2025 |  | March 2030 |  | Repay 3.25% Debentures at maturity, repaid short-term debt, paid capital expenditures and working capital
NSTAR Electric Debentures | 5.20 | % |  | 400.0 |  |  | February 2025 |  | March 2035 |  | Repay 3.25% Debentures at maturity, repaid short-term debt, paid capital expenditures and working capital
PSNH Series Y First Mortgage Bonds | 4.40 | % |  | 300.0 |  |  | June 2025 |  | July 2028 |  | Repaid short-term debt, paid capital expenditures and working capital
Eversource Parent Series H Senior Notes | 3.15 | % |  | (300.0) |  |  | January 2025 |  | January 2025 |  | Paid at maturity
NSTAR Gas Series Y First Mortgage Bonds | 4.86 | % |  | 205.0 |  |  | June 2025 |  | June 2030 |  | Repaid short-term debt, paid capital expenditures and working capital
NSTAR Gas Series Z First Mortgage Bonds | 5.30 | % |  | 20.0 |  |  | June 2025 |  | June 2035 |  | Repaid short-term debt, paid capital expenditures and working capital
NSTAR Gas Series R First Mortgage Bonds | 2.33 | % |  | (75.0) |  |  | May 2025 |  | May 2025 |  | Paid at maturity
Yankee Gas Series Y First Mortgage Bonds | 5.02 | % |  | 148.0 |  |  | July 2025 |  | January 2031 |  | Repay Series M bonds at maturity, repaid short-term debt, paid capital expenditures and working capital
Yankee Gas Series Z First Mortgage Bonds | 5.55 | % |  | 37.0 |  |  | July 2025 |  | July 2035 |  | Repay Series M bonds at maturity, repaid short-term debt, paid capital expenditures and working capital

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477314/942-235-S99-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480738/235-10-S50-4 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69B -Publisher FASB -URI https://asc.fasb.org/1943274/2147481568/470-20-55-69B Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69E -Publisher FASB -URI https://asc.fasb.org/1943274/2147481568/470-20-55-69E Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482925/835-30-45-2 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-3 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477734/942-470-50-3 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-8 Reference 11: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-6 Reference 12: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-7 + Details
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- Definition Tabular disclosure of short-term debt arrangements (having initial terms of repayment within one year or the normal operating cycle, if longer) including: (1) description of the short-term debt arrangement; (2) identification of the lender or type of lender; (3) repayment terms; (4) weighted average interest rate; (5) carrying amount of funds borrowed under the specified short-term debt arrangement as of the balance sheet date; (6) description of the refinancing of a short-term obligation when that obligation is excluded from current liabilities in the balance sheet; and (7) amount of a short-term obligation that has been excluded from current liabilities in the balance sheet because of a refinancing of the obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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