SHORT-TERM DEBT (Tables)

12 Months Ended

Dec. 31, 2022

Debt Disclosure [Abstract]

Schedule of Borrowings Outstanding

The amount of borrowings outstanding and available under the commercial paper programs were as follows:

	Borrowings Outstanding  as of December 31,				Available Borrowing Capacity as of December 31,				Weighted-Average Interest Rate as of December 31,
(Millions of Dollars)	2022		2021		2022		2021		2022		2021
Eversource Parent Commercial Paper Program	$	1,442.2	$	1,343.0	$	557.8	$	657.0	4.63	%	0.31	%
NSTAR Electric Commercial Paper Program	—		162.5		650.0		487.5		—	%	0.14	%

Details of long-term debt outstanding are as follows:

CL&P (Millions of Dollars)			As of December 31,
	Interest Rate		2022		2021
First Mortgage Bonds:
1994 Series D due 2024	7.875	%	$	139.8	$	139.8
2004 Series B due 2034	5.750	%	130.0		130.0
2005 Series B due 2035	5.625	%	100.0		100.0
2006 Series A due 2036	6.350	%	250.0		250.0
2007 Series B due 2037	5.750	%	150.0		150.0
2007 Series D due 2037	6.375	%	100.0		100.0
2013 Series A due 2023	2.500	%	400.0		400.0
2014 Series A due 2044	4.300	%	475.0		475.0
2015 Series A due 2045	4.150	%	350.0		350.0
2017 Series A due 2027	3.200	%	500.0		500.0
2018 Series A due 2048	4.000	%	800.0		800.0
2020 Series A due 2025	0.750	%	400.0		400.0
2021 Series A due 2031	2.050	%	425.0		425.0
Total First Mortgage Bonds			4,219.8		4,219.8
Less Amounts due Within One Year			(400.0)		—
Current Portion Classified as Long-Term Debt (1)			400.0		—
Unamortized Premiums and Discounts, Net			21.5		23.1
Unamortized Debt Issuance Costs			(24.8)		(27.5)
CL&P Long-Term Debt			$	4,216.5	$	4,215.4

NSTAR Electric (Millions of Dollars)			As of December 31,
	Interest Rate		2022		2021
Debentures:
2006 Debentures due 2036	5.750	%	$	200.0	$	200.0
2010 Debentures due 2040	5.500	%	300.0		300.0
2012 Debentures due 2022	2.375	%	—		400.0
2014 Debentures due 2044	4.400	%	300.0		300.0
2015 Debentures due 2025	3.250	%	250.0		250.0
2016 Debentures due 2026	2.700	%	250.0		250.0
2017 Debentures due 2027	3.200	%	700.0		700.0
2019 Debentures due 2029	3.250	%	400.0		400.0
2020 Debentures due 2030	3.950	%	400.0		400.0
2021 Debentures due 2051	3.100	%	300.0		300.0
2021 Debentures due 2031	1.950	%	300.0		300.0
2022 Debentures due 2052	4.550	%	450.0		—
2022 Debentures due 2052	4.950	%	400.0		—
Total Debentures			4,250.0		3,800.0
Notes:
2004 Senior Notes Series B due 2034	5.900	%	50.0		50.0
2007 Senior Notes Series D due 2037	6.700	%	40.0		40.0
2013 Senior Notes Series G due 2023	3.880	%	80.0		80.0
2016 Senior Notes Series H due 2026	2.750	%	50.0		50.0
Total Notes			220.0		220.0
Less Amounts due Within One Year			(80.0)		(400.0)
Unamortized Premiums and Discounts, Net			(14.8)		(11.2)
Unamortized Debt Issuance Costs			(30.1)		(23.4)
NSTAR Electric Long-Term Debt			$	4,345.1	$	3,585.4

PSNH (Millions of Dollars)			As of December 31,
	Interest Rate		2022		2021
First Mortgage Bonds:
2005 Series M due 2035	5.600	%	$	50.0	$	50.0
2013 Series S due 2023	3.500	%	325.0		325.0
2019 Series T due 2049	3.600	%	300.0		300.0
2020 Series U due 2050	2.400	%	150.0		150.0
2021 Series V due 2031	2.200	%	350.0		350.0
Total First Mortgage Bonds			1,175.0		1,175.0
Less Amounts due Within One Year			(325.0)		—
Current Portion Classified as Long-Term Debt (1)			295.3		—
Unamortized Premiums and Discounts, Net			(2.5)		(2.6)
Unamortized Debt Issuance Costs			(7.9)		(8.6)
PSNH Long-Term Debt			$	1,134.9	$	1,163.8

OTHER (Millions of Dollars)					As of December 31,
	Interest Rate				2022		2021
Yankee Gas - First Mortgage Bonds due 2024 - 2051	1.380	%	-	5.350%	$	845.0	$	765.0
NSTAR Gas - First Mortgage Bonds due 2025 - 2051	2.250	%	-	7.110%	705.0		580.0
EGMA - First Mortgage Bonds due 2031 - 2052	2.110	%	-	4.700%	650.0		550.0
Aquarion - Senior Notes due 2024	4.000%				360.0		360.0
Aquarion - Unsecured Notes due 2023 - 2052	—	%	-	6.430%	464.7		394.9
Aquarion - Secured Debt due 2023 - 2044	2.864	%	-	9.290%	34.4		39.6
Eversource Parent - Senior Notes due 2023 - 2050	0.800	%	-	4.600%	8,150.0		6,100.0
Pre-1983 Spent Nuclear Fuel Obligation (CYAPC)					11.9		11.7
Fair Value Adjustment (2)					26.2		43.8
Less Fair Value Adjustment - Current Portion (2)					(7.0)		(17.7)
Less Amounts due in One Year					(1,203.4)		(775.4)
Unamortized Premiums and Discounts, Net					40.1		43.4
Unamortized Debt Issuance Costs					(49.4)		(36.3)
Total Other Long-Term Debt					$	10,027.5	$	8,059.0
Total Eversource Long-Term Debt					$	19,724.0	$	17,023.6

(1)     As a result of the CL&P and PSNH long-term debt issuances in January 2023, $400 million and $295.3 million, respectively, of current portion of long-term debt were reclassified as Long-Term Debt on CL&P’s and PSNH’s balance sheets as of December 31, 2022.

(2)     The fair value adjustment amount is the purchase price adjustments, net of amortization, required to record long-term debt at fair value on the dates of the 2012 merger with NSTAR and the 2017 acquisition of Aquarion.