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MARKETABLE SECURITIES (Tables)
 3 Months Ended
Mar. 31, 2025
Investments, Debt and Equity Securities [Abstract]  
Summary 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, 2025As of December 31, 2024
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$163.5 $0.6 $(3.8)$160.3 $163.2 $0.1 $(6.1)$157.2 
Contractual Maturities of Available-for-Sale Debt Securities
As of March 31, 2025, the contractual maturities of available-for-sale debt securities were as follows:
 
Eversource
(Millions of Dollars)
Amortized CostFair Value
Less than one year
$13.0 $13.0 
One to five years42.1 42.4 
Six to ten years23.8 23.7 
Greater than ten years84.6 81.2 
Total Debt Securities$163.5 $160.3 
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, 2025As of December 31, 2024
Level 1:    
Mutual Funds and Equities$163.8 $163.1 
Money Market Funds9.5 10.0 
Total Level 1$173.3 $173.1 
Level 2:  
U.S. Government Issued Debt Securities (Agency and Treasury)$91.0 $92.0 
Corporate Debt Securities37.9 32.5 
Asset-Backed Debt Securities8.5 7.8 
Municipal Bonds6.8 6.8 
Other Fixed Income Securities6.6 8.1 
Total Level 2$150.8 $147.2 
Total Marketable Securities$324.1 $320.3