XML 91 R63.htm IDEA: XBRL DOCUMENT
v3.25.0.1

MARKETABLE SECURITIES (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract] |
Schedule of Available-for-sale Securities Reconciliation | 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 |
Investments Classified by Contractual Maturity Date | 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.
Marketable Securities Recorded at Fair Value | 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 |

X
- References No definition available. + Details
Name: | es_FairValueHeirarchyTableTextBlock
Namespace Prefix: | es_
Data Type: | dtr-types1:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
Name: | us-gaap_InvestmentsClassifiedByContractualMaturityDateTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration