FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)

3 Months Ended

Mar. 31, 2022

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, 2022:
Preferred Stock Not Subject to Mandatory Redemption	$	155.6	$	158.3	$	116.2	$	115.5	$	43.0	$	42.8	$	—	$	—
Long-Term Debt	18,729.6		18,562.3		4,215.7		4,392.2		3,986.3		4,094.1		1,164.0		1,086.3
Rate Reduction Bonds	475.3		492.8		—		—		—		—		475.3		492.8
As of December 31, 2021:
Preferred Stock Not Subject to Mandatory Redemption	$	155.6	$	166.3	$	116.2	$	122.3	$	43.0	$	44.0	$	—	$	—
Long-Term Debt	18,216.7		19,636.3		4,215.4		4,848.9		3,985.4		4,453.5		1,163.8		1,220.6
Rate Reduction Bonds	496.9		543.3		—		—		—		—		496.9		543.3