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MARKETABLE SECURITIES | 12 Months Ended
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Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract] |
MARKETABLE SECURITIES | MARKETABLE SECURITIES Eversource’s marketable securities include the CYAPC and YAEC legally restricted trusts that each hold equity and available-for-sale debt securities to fund the spent nuclear fuel removal obligations of their nuclear fuel storage facilities. Eversource also holds trusts that are not subject to regulatory oversight by state or federal agencies that are primarily used to fund certain non-qualified executive benefits. The marketable securities within the non-qualified executive benefit trusts were sold in 2023. Equity and available-for-sale debt marketable securities are recorded at fair value, with the current portion recorded in Prepayments and Other Current Assets and the long-term portion recorded in Marketable Securities on the balance sheets. CYAPC and YAEC’s spent nuclear fuel trusts are restricted and are classified in long-term Marketable Securities on the balance sheets. Equity Securities: Eversource's equity securities include CYAPC's and YAEC's marketable securities held in spent nuclear fuel trusts, which had fair values of $163.1 million and $173.6 million as of December 31, 2024 and 2023, respectively. Unrealized gains and losses for these spent nuclear fuel trusts are subject to regulatory accounting treatment and are recorded in Marketable Securities with the corresponding offset to long-term liabilities on the balance sheets, with no impact on the statements of income. Unrealized gains and losses on equity securities held in other trusts are recorded in Other Income, Net on the statements of income. The equity securities within Eversource’s non-qualified executive benefits trusts were sold during 2023 and resulted in a $1.1 million gain recorded in Other Income, Net for the year ended December 31, 2023. The remaining equity securities held in Eversource’s trusts as of December 31, 2024 of $4.1 million were reclassified to Assets Held for Sale on the Eversource balance sheet. As of December 31, 2023, these equity securities totaled $3.3 million and there were unrealized gains of $0.6 million recorded in Other Income, Net in 2023. For further information, see Note 24, “Assets Held for Sale.” Available-for-Sale Debt Securities: The following is a summary of available-for-sale debt securities, which are held in CYAPC’s and YAEC’s spent nuclear fuel trusts:
| As of December 31,
| 2024 |  | 2023
Eversource (Millions of Dollars) | Amortized Cost |  | Pre-Tax Unrealized Gains |  | Pre-Tax Unrealized Losses |  | Fair Value |  | Amortized Cost |  | Pre-Tax Unrealized Gains |  | Pre-Tax Unrealized Losses |  | Fair Value
Debt Securities | $ | 163.2 |  |  | $ | 0.1 |  |  | $ | (6.1) |  |  | $ | 157.2 |  |  | $ | 169.5 |  |  | $ | 1.4 |  |  | $ | (6.6) |  |  | $ | 164.3 |
Unrealized gains and losses for available-for-sale debt securities included in the CYAPC and YAEC spent nuclear fuel trusts are subject to regulatory accounting treatment and are recorded in Marketable Securities with the corresponding offset to long-term liabilities on the balance sheets, with no impact on the statements of income. Any unrealized gains and losses on available-for-sale debt securities held in other trusts are recorded in Accumulated Other Comprehensive Income, excluding amounts related to credit losses or losses on securities intended to be sold, which are recorded in Other Income, Net. The debt securities within Eversource’s non-qualified executive benefits trusts were sold during 2023. There were $1.2 million of realized losses recorded on securities sold for the year ended December 31, 2023 that were reclassified out of Accumulated Other Comprehensive Income and recorded in Other Income, Net. There were no credit losses for the years ended December 31, 2024 and 2023, and no allowance for credit losses as of December 31, 2024. Factors considered in determining whether a credit loss exists include adverse conditions specifically affecting the issuer, the payment history, ratings and rating changes of the security, and the severity of the impairment. For asset-backed debt securities, underlying collateral and expected future cash flows are also evaluated. As of December 31, 2024, the contractual maturities of available-for-sale debt securities were as follows:
Eversource (Millions of Dollars) | Amortized Cost |  | Fair Value
Less than one year | $ | 11.3 |  |  | $ | 11.7 |
One to five years | 35.6 |  |  | 35.6 |
Six to ten years | 43.5 |  |  | 42.6 |
Greater than ten years | 72.8 |  |  | 67.3 |
Total Debt Securities | $ | 163.2 |  |  | $ | 157.2 |
Realized Gains and Losses: Realized gains and losses are offset in long-term liabilities for CYAPC and YAEC and are recorded in Other Income, Net for Eversource's benefit trusts. Eversource utilizes the average cost basis method for the CYAPC and YAEC spent nuclear fuel trusts and the specific identification basis method for the Eversource non-qualified benefit trusts to compute the realized gains and losses on the sale of marketable securities. Fair Value Measurements: The following table presents the marketable securities recorded at fair value on a recurring basis by the level in which they are classified within the fair value hierarchy:
Eversource (Millions of Dollars) | As of December 31,
2024 |  | 2023
Level 1: |  |  |
Mutual Funds and Equities | $ | 163.1 |  |  | $ | 176.9 |
Money Market Funds | 10.0 |  |  | 13.7 |
Total Level 1 | $ | 173.1 |  |  | $ | 190.6 |
Level 2: |  |  |
U.S. Government Issued Debt Securities (Agency and Treasury) | $ | 92.0 |  |  | $ | 90.1 |
Corporate Debt Securities | 32.5 |  |  | 34.0 |
Asset-Backed Debt Securities | 7.8 |  |  | 5.6 |
Municipal Bonds | 6.8 |  |  | 9.8 |
Other Fixed Income Securities | 8.1 |  |  | 11.1 |
Total Level 2 | $ | 147.2 |  |  | $ | 150.6 |
Total Marketable Securities | $ | 320.3 |  |  | $ | 341.2 |
U.S. government issued debt securities are valued using market approaches that incorporate transactions for the same or similar bonds and adjustments for yields and maturity dates. Corporate debt securities are valued using a market approach, utilizing recent trades of the same or similar instruments and also incorporating yield curves, credit spreads and specific bond terms and conditions. Asset-backed debt securities include collateralized mortgage obligations, commercial mortgage backed securities, and securities collateralized by auto loans, credit card loans or receivables. Asset-backed debt securities are valued using recent trades of similar instruments, prepayment assumptions, yield curves, issuance and maturity dates, and tranche information. Municipal bonds are valued using a market approach that incorporates reported trades and benchmark yields. Other fixed income securities are valued using pricing models, quoted prices of securities with similar characteristics, and discounted cash flows.

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