COMMITMENTS AND CONTINGENCIES (Tables)

12 Months Ended

Dec. 31, 2018

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, 2017	$	65.8		$	4.9		$	3.8		$	5.3
Additions	6.2			0.5			1.8			1.0
Payments/Reductions	(17.1		)	(0.7		)	(2.9		)	(0.6		)
Balance as of December 31, 2017	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

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
2018	60	15	16	9
2017	59	14	15	10

Long-term Purchase Commitment

The total costs incurred under these agreements were as follows:



Eversource	For the Years Ended December 31,
(Millions of Dollars)	2018		2017		2016
Purchased Power and Capacity	$	72.0	$	103.9	$	152.5
Renewable Energy	218.5		235.5		210.9
Peaker CfDs	20.9		38.7		47.7
Natural Gas Procurement	432.4		377.0		323.9
Transmission Support Commitments	23.4		19.8		15.9
Coal, Wood and Other ⁽¹⁾	—		47.7		55.7



	For the Years Ended December 31,
	2018						2017						2016
(Millions of Dollars)	CL&P		NSTAR Electric		PSNH		CL&P		NSTAR Electric		PSNH		CL&P		NSTAR Electric		PSNH
Purchased Power and Capacity	$	49.4	$	4.4	$	18.2	$	81.0	$	4.0	$	18.9	$	132.7	$	0.7	$	19.1
Renewable Energy	63.2		89.8		65.5		51.0		123.7		60.8		42.1		101.1		67.7
Peaker CfDs	20.9		—		—		38.7		—		—		47.7		—		—
Transmission Support Commitments	9.2		9.2		5.0		7.8		7.8		4.2		6.3		6.2		3.4
Coal, Wood and Other ⁽¹⁾	—		—		—		—		—		47.7		—		—		55.7

⁽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. On January 10, 2018, Eversource and PSNH completed the sale of PSNH's thermal generation assets. On August 26, 2018, Eversource and PSNH completed the sale of PSNH's hydroelectric generation assets. Upon sale, the remaining future contractual obligations were transferred to the respective buyers. See Note 13, "Generation Asset Sale," for further information.

The estimated future annual costs of significant executed, non-cancelable, long-term contractual arrangements in effect as of December 31, 2018 are as follows:



Eversource
(Millions of Dollars)	2019		2020		2021		2022		2023		Thereafter		Total
Purchased Power and Capacity	$	68.3	$	73.5	$	69.1	$	72.9	$	74.1	$	142.9	$	500.8
Renewable Energy	262.4		261.0		238.9		240.5		217.2		1,662.0		2,882.0
Peaker CfDs	11.9		22.6		21.9		15.3		17.5		43.5		132.7
Natural Gas Procurement	243.8		227.7		183.6		149.2		135.1		1,039.7		1,979.1
Transmission Support Commitments	22.8		23.1		15.2		16.2		17.8		17.8		112.9
Total	$	609.2	$	607.9	$	528.7	$	494.1	$	461.7	$	2,905.9	$	5,607.5



CL&P
(Millions of Dollars)	2019		2020		2021		2022		2023		Thereafter		Total
Purchased Power and Capacity	$	57.0	$	69.7	$	65.3	$	69.1	$	70.4	$	123.9	$	455.4
Renewable Energy	102.0		103.8		104.0		104.9		105.5		785.3		1,305.5
Peaker CfDs	11.9		22.6		21.9		15.3		17.5		43.5		132.7
Transmission Support Commitments	9.0		9.1		6.0		6.4		7.0		7.0		44.5
Total	$	179.9	$	205.2	$	197.2	$	195.7	$	200.4	$	959.7	$	1,938.1



NSTAR Electric
(Millions of Dollars)	2019		2020		2021		2022		2023		Thereafter		Total
Purchased Power and Capacity	$	5.5	$	3.1	$	3.1	$	3.1	$	3.0	$	19.0	$	36.8
Renewable Energy	94.7		93.1		88.6		88.8		63.9		435.1		864.2
Transmission Support Commitments	9.0		9.1		6.0		6.3		7.0		7.0		44.4
Total	$	109.2	$	105.3	$	97.7	$	98.2	$	73.9	$	461.1	$	945.4



PSNH
(Millions of Dollars)	2019		2020		2021		2022		2023		Thereafter		Total
Purchased Power and Capacity	$	5.8	$	0.7	$	0.7	$	0.7	$	0.7	$	—	$	8.6
Renewable Energy	65.7		64.1		46.3		46.8		47.8		441.6		712.3
Transmission Support Commitments	4.8		4.9		3.2		3.5		3.8		3.8		24.0
Total	$	76.3	$	69.7	$	50.2	$	51.0	$	52.3	$	445.4	$	744.9

Schedule of Guarantor Obligations

The following table summarizes Eversource parent's exposure to guarantees and indemnifications of its subsidiaries to external parties, as of December 31, 2018:



Company	Description	Maximum Exposure (in millions)		Expiration Dates
On behalf of subsidiaries:
Eversource Gas Transmission LLC	Access Northeast Project Capital Contributions Guaranty ⁽¹⁾	$	184.9	2021
Various	Surety Bonds⁽²⁾	41.9		2019 - 2021
Rocky River Realty Company and Eversource Service	Lease Payments for Real Estate	6.3		2019 - 2024
Bay State Wind LLC	Real Estate Purchase	2.5		2019

⁽¹⁾ Eversource parent issued a declining balance guaranty on behalf of its subsidiary, Eversource Gas Transmission LLC, to guarantee the payment of the subsidiary's authorized capital contributions for its investment in the Access Northeast project. The guaranty decreases as authorized capital contributions are made. The guaranty will expire upon the earlier of the full performance of the guaranteed obligations or December 31, 2021.

⁽²⁾ 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.