FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)

3 Months Ended

Mar. 31, 2023

Fair Value Disclosures [Abstract]

Carrying Amounts and Estimated Fair Values of Financial Instruments

Carrying amounts and estimated fair values are as follows:

	Eversource				CL&P				NSTAR Electric				PSNH
(Millions of Dollars)	Carrying Amount		Fair Value		Carrying Amount		Fair Value		Carrying Amount		Fair Value		Carrying Amount		Fair Value
As of March 31, 2023:
Preferred Stock Not Subject to Mandatory Redemption	$	155.6	$	137.1	$	116.2	$	100.8	$	43.0	$	36.3	$	—	$	—
Long-Term Debt	22,178.0		20,650.5		4,310.2		4,096.9		4,426.0		4,217.4		1,459.4		1,331.7
Rate Reduction Bonds	432.1		417.3		—		—		—		—		432.1		417.3
As of December 31, 2022:
Preferred Stock Not Subject to Mandatory Redemption	$	155.6	$	136.7	$	116.2	$	99.2	$	43.0	$	37.5	$	—	$	—
Long-Term Debt	21,044.1		18,891.3		4,216.5		3,828.3		4,425.1		4,091.8		1,164.6		970.5
Rate Reduction Bonds	453.7		424.7		—		—		—		—		453.7		424.7