MARKETABLE SECURITIES (Tables)

12 Months Ended

Dec. 31, 2025

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,
	2025								2024
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	$	156.5	$	0.7	$	(1.8)	$	155.4	$	163.2	$	0.1	$	(6.1)	$	157.2

Investments Classified by Contractual Maturity Date

As of December 31, 2025, the contractual maturities of available-for-sale debt securities were as follows:    

Eversource (Millions of Dollars)	Amortized Cost		Fair Value
Less than one year	$	15.7	$	15.8
One to five years	39.9		40.6
Six to ten years	26.0		26.1
Greater than ten years	74.9		72.9
Total Debt Securities	$	156.5	$	155.4

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,
	2025		2024
Level 1:
Mutual Funds and Equities	$	165.3	$	163.1
Money Market Funds	14.0		10.0
Total Level 1	$	179.3	$	173.1
Level 2:
U.S. Government Issued Debt Securities (Agency and Treasury)	$	82.0	$	92.0
Corporate Debt Securities	37.9		32.5
Asset-Backed Debt Securities	6.4		7.8
Municipal Bonds	7.2		6.8
Other Fixed Income Securities	7.9		8.1
Total Level 2	$	141.4	$	147.2
Total Marketable Securities	$	320.7	$	320.3