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MARKETABLE SECURITIES (Tables)
 3 Months Ended
Mar. 31, 2026
Investments, Debt and Equity Securities [Abstract]  
Schedule of 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 March 31, 2026As of December 31, 2025
Eversource
(Millions of Dollars)
Amortized CostPre-Tax
Unrealized Gains		Pre-Tax
Unrealized
Losses		Fair ValueAmortized CostPre-Tax
Unrealized Gains		Pre-Tax
Unrealized
Losses		Fair Value
Debt Securities$151.6 $1.7 $(1.4)$151.9 $156.5 $0.7 $(1.8)$155.4 
Schedule of Contractual Maturities of Available-for-Sale Debt Securities
As of March 31, 2026, the contractual maturities of available-for-sale debt securities were as follows:
 
Eversource
(Millions of Dollars)
Amortized CostFair Value
Less than one year
$11.8 $12.0 
One to five years45.2 46.0 
Six to ten years22.7 22.9 
Greater than ten years71.9 71.0 
Total Debt Securities$151.6 $151.9 
Schedule of Marketable Securities Recorded at Fair Value on a Recurring Basis by Level 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 March 31, 2026As of December 31, 2025
Level 1:    
Mutual Funds and Equities$173.3 $165.3 
Money Market Funds8.2 14.0 
Total Level 1$181.5 $179.3 
Level 2:  
U.S. Government Issued Debt Securities (Agency and Treasury)$82.9 $82.0 
Corporate Debt Securities38.6 37.9 
Asset-Backed Debt Securities6.1 6.4 
Municipal Bonds7.3 7.2 
Other Fixed Income Securities8.8 7.9 
Total Level 2$143.7 $141.4 
Total Marketable Securities$325.2 $320.7