FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)

6 Months Ended

Jun. 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 June 30, 2020:
Preferred Stock Not Subject to Mandatory Redemption	$	155.6	$	164.9	$	116.2	$	120.5	$	43.0	$	44.4	$	—	$	—
Long-Term Debt	14,398.7		16,329.6		3,518.1		4,251.6		3,642.6		4,240.9		951.6		1,050.3
Rate Reduction Bonds	561.7		619.2		—		—		—		—		561.7		619.2
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