FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)

9 Months Ended

Sep. 30, 2020

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 September 30, 2020:
Preferred Stock Not Subject to Mandatory Redemption	$	155.6	$	166.6	$	116.2	$	122.0	$	43.0	$	44.6	$	—	$	—
Long-Term Debt	15,814.5		17,943.7		3,518.1		4,336.7		3,642.8		4,285.4		1,099.0		1,192.1
Rate Reduction Bonds	540.1		603.0		—		—		—		—		540.1		603.0
As of December 31, 2019:
Preferred Stock Not Subject to Mandatory Redemption	$	155.6	$	162.0	$	116.2	$	117.8	$	43.0	$	44.2	$	—	$	—
Long-Term Debt	14,098.2		15,170.2		3,518.1		4,058.0		3,342.1		3,659.9		951.6		1,005.7
Rate Reduction Bonds	583.3		625.9		—		—		—		—		583.3		625.9