REGULATORY ACCOUNTING (Tables)

12 Months Ended

Dec. 31, 2017

The components of regulatory assets were as follows:



Eversource (Millions of Dollars)	As of December 31,
Eversource (Millions of Dollars)	2017		2016
Benefit Costs	$	2,068.8	$	1,817.8
Deferred Costs from Generation Asset Sale	516.1		—
Derivative Liabilities	367.2		423.3
Income Taxes, Net	768.9		644.5
Storm Restoration Costs	404.8		385.3
Goodwill-related	365.2		464.4
Regulatory Tracker Mechanisms	509.9		576.6
Asset Retirement Obligations	101.0		99.3
Other Regulatory Assets	137.4		115.1
Total Regulatory Assets	5,239.3		4,526.3
Less: Current Portion	741.9		887.6
Total Long-Term Regulatory Assets	$	4,497.4	$	3,638.7



	As of December 31,
	2017						2016
(Millions of Dollars)	CL&P		NSTAR Electric		PSNH		CL&P		NSTAR Electric		PSNH
Benefit Costs	$	469.2	$	560.7	$	212.3	$	429.3	$	525.3	$	184.2
Deferred Costs from Generation Asset Sale	—		—		516.1		—		—		—
Derivative Liabilities	362.3		—		—		420.5		2.8		—
Income Taxes, Net	453.8		113.2		21.7		437.0		120.5		24.2
Storm Restoration Costs	216.7		146.6		41.5		239.8		128.4		17.1
Goodwill-related	—		313.6		—		—		398.7		—
Regulatory Tracker Mechanisms	85.3		273.0		116.4		123.9		304.0		104.5
Asset Retirement Obligations	30.3		39.0		17.0		33.2		36.1		16.2
Other Regulatory Assets	27.6		78.4		15.8		43.4		22.7		16.5
Total Regulatory Assets	1,645.2		1,524.5		940.8		1,727.1		1,538.5		362.7
Less: Current Portion	200.3		333.9		130.1		335.5		353.5		117.2
Total Long-Term Regulatory Assets	$	1,444.9	$	1,190.6	$	810.7	$	1,391.6	$	1,185.0	$	245.5

Schedule of Regulatory Liabilities

The components of regulatory liabilities were as follows:



Eversource (Millions of Dollars)	As of December 31,
Eversource (Millions of Dollars)	2017		2016
Cost of Removal	$	502.1	$	459.7
Benefit Costs	132.3		136.2
Regulatory Tracker Mechanisms	136.7		145.3
AFUDC - Transmission	67.1		65.8
Other Regulatory Liabilities	45.2		42.1
Total Regulatory Liabilities ⁽¹⁾	883.4		849.1
Less: Current Portion	128.1		146.8
Total Long-Term Regulatory Liabilities ⁽¹⁾	$	755.3	$	702.3



	As of December 31,
	2017						2016
(Millions of Dollars)	CL&P		NSTAR Electric		PSNH		CL&P		NSTAR Electric		PSNH
Cost of Removal	$	23.2	$	293.8	$	37.9	$	38.8	$	280.2	$	44.1
Benefit Costs	—		112.6		—		—		113.1		—
Regulatory Tracker Mechanisms	34.6		77.8		5.0		37.2		78.4		10.7
AFUDC - Transmission	48.8		18.3		—		50.2		15.6		—
Other Regulatory Liabilities	12.9		3.7		2.7		21.0		0.3		2.7
Total Regulatory Liabilities ⁽¹⁾	119.5		506.2		45.6		147.2		487.6		57.5
Less: Current Portion	39.0		79.6		6.3		47.1		78.5		12.7
Total Long-Term Regulatory Liabilities ⁽¹⁾	$	80.5	$	426.6	$	39.3	$	100.1	$	409.1	$	44.8

⁽¹⁾The amounts above do not include the impacts associated with the "Tax Cuts and Jobs Act" (the "Act"), which became law on December 22, 2017. Pursuant to the enacted law, Eversource remeasured its existing deferred federal income tax balances as of December 31, 2017 to reflect the decrease in the U.S. federal corporate income tax rate from 35 percent to 21 percent. The remeasurement resulted in provisional regulated excess accumulated deferred income tax (ADIT) liabilities that we expect to benefit our customers in future periods, which were estimated to be approximately $2.9 billion (approximately $1.0 billion at CL&P, $1.1 billion at NSTAR Electric and $0.4 billion at PSNH) as of December 31, 2017 and recognized as regulatory liabilities on the balance sheet. We estimate that about 85 percent of the provisional regulated excess ADIT liabilities relate to property, plant, and equipment with remaining useful lives estimated to be in excess of 20 years. These amounts are subject to IRS normalization rules and would be returned to customers using the same timing as the remaining useful lives of the underlying assets that gave rise to the ADIT liabilities. The Eversource regulated companies are currently working with the state regulatory commissions, who have opened investigations to examine the impact of the Act on customer rates. For further information, see Note 10, "Income Taxes," to the financial statements.