ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Tables)

12 Months Ended

Dec. 31, 2023

Changes in Accumulated Other Comprehensive Income/(Loss) by Component, Net of Tax

The changes in accumulated other comprehensive income/(loss) by component, net of tax, are as follows:


	For the Year Ended December 31, 2023								For the Year Ended December 31, 2022
Eversource (Millions of Dollars)	Qualified Cash Flow Hedging Instruments		Unrealized Gains/(Losses) on Marketable Securities		Defined Benefit Plans		Total		Qualified Cash Flow Hedging Instruments		Unrealized Gains/(Losses) on Marketable Securities		Defined Benefit Plans		Total
Balance as of January 1st	$	(0.4)	$	(1.2)	$	(37.8)	$	(39.4)	$	(0.4)	$	0.4	$	(42.3)	$	(42.3)

OCI Before Reclassifications	—		—		(8.8)		(8.8)		—		(1.6)		(2.5)		(4.1)
Amounts Reclassified from AOCI	—		1.2		13.3		14.5		—		—		7.0		7.0
Net OCI	—		1.2		4.5		5.7		—		(1.6)		4.5		2.9
Balance as of December 31st	$	(0.4)	$	—	$	(33.3)	$	(33.7)	$	(0.4)	$	(1.2)	$	(37.8)	$	(39.4)

Schedule of Amounts Reclassified from AOCI by Component

The following table sets forth the amounts reclassified from AOCI by component and the impacted line item on the statements of income:


	Amounts Reclassified from AOCI
Eversource (Millions of Dollars)	For the Years Ended December 31,						Statements of Income Line Item Impacted
	2023		2022		2021
Qualified Cash Flow Hedging Instruments	$	—	$	—	$	(1.7)	Interest Expense
Tax Effect	—		—		0.7		Income Tax Expense
Qualified Cash Flow Hedging Instruments, Net of Tax	—		—		(1.0)

Unrealized Gains/(Losses) on Marketable Securities	(1.6)		—		—		Other Income, Net
Tax Effect	0.4		—		—		Income Tax Expense
Unrealized Gains/(Losses) on Marketable Securities, Net of Tax	(1.2)		—		—

Defined Benefit Plan Costs:
Amortization of Actuarial Losses	(7.0)		(9.0)		(13.1)		Other Income, Net (1)
Amortization of Prior Service Cost	(0.3)		(0.3)		—		Other Income, Net (1)
Settlement Loss	(12.4)		—		—		Other Income, Net (1)
Total Defined Benefit Plan Costs	(19.7)		(9.3)		(13.1)
Tax Effect	6.4		2.3		3.4		Income Tax Expense
Defined Benefit Plan Costs, Net of Tax	(13.3)		(7.0)		(9.7)
Total Amounts Reclassified from AOCI, Net of Tax	$	(14.5)	$	(7.0)	$	(10.7)

(1) These amounts are included in the computation of net periodic Pension, SERP and PBOP costs. See Note 1K, "Summary of Significant Accounting Policies – Other Income, Net" and Note 11A, "Employee Benefits – Pension Benefits and Postretirement Benefits Other Than Pension," for further information.