COMMITMENTS AND CONTINGENCIES (Tables)

12 Months Ended

Dec. 31, 2019

Commitments and Contingencies Disclosure [Abstract]

Schedule of Environmental Loss Contingencies by Site

A reconciliation of the activity in the environmental reserves is as follows:

(Millions of Dollars)	Eversource			CL&P			NSTAR Electric			PSNH
Balance as of January 1, 2018	$	54.9		$	4.7		$	2.7		$	5.7
Additions	23.5			1.9			9.7			—
Payments/Reductions	(13.7		)	(1.2		)	(1.5		)	(0.3		)
Balance as of December 31, 2018	64.7			5.4			10.9			5.4
Additions	26.5			7.0			0.5			2.8
Payments/Reductions	(10.2		)	(1.0		)	(3.4		)	(0.7		)
Balance as of December 31, 2019	$	81.0		$	11.4		$	8.0		$	7.5

The number of environmental sites for which remediation or long-term monitoring, preliminary site work or site assessment is being performed are as follows:

	Eversource	CL&P	NSTAR Electric	PSNH
2019	57	15	15	9
2018	60	15	16	9

Schedule of Estimated Future Annual Costs of Long term Contractual Agreement

The estimated future annual costs of significant executed, non-cancelable, long-term contractual arrangements in effect as of December 31, 2019 are as follows:

Eversource
(Millions of Dollars)	2020		2021		2022		2023		2024		Thereafter		Total
Renewable Energy	$	614.6	$	594.3	$	651.7	$	629.1	$	624.8	$	3,590.6	$	6,705.1
Purchased Power and Capacity	73.5		69.0		75.1		81.6		75.9		71.5		446.6
Peaker CfDs	22.4		23.0		16.9		20.1		15.5		29.8		127.7
Natural Gas Procurement	266.2		255.3		202.8		166.7		165.7		1,093.3		2,150.0
Transmission Support Commitments	22.1		—		—		—		—		—		22.1
Total	$	998.8	$	941.6	$	946.5	$	897.5	$	881.9	$	4,785.2	$	9,451.5

CL&P
(Millions of Dollars)	2020		2021		2022		2023		2024		Thereafter		Total
Renewable Energy	$	457.3	$	459.6	$	514.4	$	516.2	517.4		2,790.6		$	5,255.5
Purchased Power and Capacity	69.8		65.3		71.4		78.0		72.9		55.5		412.9
Peaker CfDs	22.4		23.0		16.9		20.1		15.5		29.8		127.7
Transmission Support Commitments	8.7		—		—		—		—		—		8.7
Total	$	558.2	$	547.9	$	602.7	$	614.3	$	605.8	$	2,875.9	$	5,804.8

NSTAR Electric
(Millions of Dollars)	2020		2021		2022		2023		2024		Thereafter		Total
Renewable Energy	$	95.5	$	91.2	$	91.4	$	66.6	$	63.8	$	418.1	$	826.6
Purchased Power and Capacity	3.1		3.1		3.1		3.0		3.0		16.0		31.3
Transmission Support Commitments	8.7		—		—		—		—		—		8.7
Total	$	107.3	$	94.3	$	94.5	$	69.6	$	66.8	$	434.1	$	866.6

PSNH
(Millions of Dollars)	2020		2021		2022		2023		2024		Thereafter		Total
Renewable Energy	$	61.8	$	43.5	$	45.9	$	46.3	$	43.6	$	381.9	$	623.0
Purchased Power and Capacity	0.6		0.6		0.6		0.6		—		—		2.4
Transmission Support Commitments	4.7		—		—		—		—		—		4.7
Total	$	67.1	$	44.1	$	46.5	$	46.9	$	43.6	$	381.9	$	630.1

The total costs incurred under these agreements were as follows:

Eversource	For the Years Ended December 31,
(Millions of Dollars)	2019		2018		2017
Renewable Energy	$	320.8	$	218.5	$	235.5
Purchased Power and Capacity	62.1		72.0		103.9
Peaker CfDs	13.0		20.9		38.7
Natural Gas Procurement	448.5		432.4		377.0
Transmission Support Commitments	21.8		23.4		19.8
Coal, Wood and Other (1)	—		—		47.7

	For the Years Ended December 31,
	2019						2018						2017
(Millions of Dollars)	CL&P		NSTAR Electric		PSNH		CL&P		NSTAR Electric		PSNH		CL&P		NSTAR Electric		PSNH
Renewable Energy	$	160.6	$	89.9	$	70.3	$	63.2	$	89.8	$	65.5	$	51.0	$	123.7	$	60.8
Purchased Power and Capacity	50.4		5.1		6.6		49.4		4.4		18.2		81.0		4.0		18.9
Peaker CfDs	13.0		—		—		20.9		—		—		38.7		—		—
Transmission Support Commitments	8.6		8.6		4.6		9.2		9.2		5.0		7.8		7.8		4.2
Coal, Wood and Other (1)	—		—		—		—		—		—		—		—		47.7

⁽¹⁾ PSNH previously entered into various arrangements for the purchase of coal, wood and the transportation services for fuel supply for its electric generating assets. In 2018, Eversource and PSNH completed the sales of PSNH's thermal and hydroelectric generation assets. Upon sale, the remaining future contractual obligations were transferred to the respective buyers. See Note 14, "Generation Asset Sale," for further information.

Schedule of Guarantor Obligations

The following table summarizes Eversource parent's exposure to guarantees and indemnifications of its subsidiaries and affiliates to external parties as of December 31, 2019:

Company	Description	Maximum Exposure (in millions)		Expiration Dates
Various	Surety Bonds (1)	$	29.2	2020 - 2021
Rocky River Realty Company and Eversource Service	Lease Payments for Real Estate	6.5		2024
Bay State Wind LLC	Real Estate Purchase	2.5		2020
Sunrise Wind LLC	Offshore Wind (2)	2.2		—

⁽¹⁾  Surety bond expiration dates reflect termination dates, the majority of which will be renewed or extended.  Certain surety bonds contain credit ratings triggers that would require Eversource parent to post collateral in the event that the unsecured debt credit ratings of Eversource parent are downgraded.  

⁽²⁾ 

On October 25, 2019, Eversource parent issued a guaranty on behalf of its 50 percent-owned affiliate, Sunrise Wind LLC, whereby Eversource parent will guaranty Sunrise Wind LLC's performance of certain obligations, in an amount not to exceed $15.4 million, under the Offshore Wind Renewable Energy Certificate Purchase and Sale Agreement (the Agreement). The Agreement was executed on October 25, 2019, by and between NYSERDA and Sunrise Wind LLC. Obligations of Eversource parent under the guaranty expire at such time as the guaranteed obligations have been fully performed. The Company regularly reviews performance risk under this arrangement, and in the event it becomes probable that Eversource parent will be required to perform under the guarantee, the amount of probable payment will be recorded. As of December 31, 2019, the fair value of the guarantee was immaterial