REGULATORY ACCOUNTING (Tables)

9 Months Ended

Sep. 30, 2018

Regulated Operations [Abstract]

Schedule of Regulatory Assets

The components of regulatory assets were as follows:

	As of September 30, 2018								As of December 31, 2017
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
Benefit Costs	$	1,988.4	$	447.4	$	541.2	$	172.0	$	2,068.8	$	469.2	$	560.7	$	212.3
Income Taxes, Net	720.7		448.1		112.9		15.6		768.9		453.8		113.2		21.7
Securitized Stranded Costs	618.6		—		—		618.6		—		—		—		—
Deferred Costs from Generation Asset Sale	—		—		—		—		516.1		—		—		516.1
Storm Restoration Costs, Net	598.5		319.7		222.1		56.7		404.8		216.7		146.6		41.5
Regulatory Tracker Mechanisms	257.8		39.5		128.4		74.9		509.9		85.3		273.0		116.4
Derivative Liabilities	360.0		359.9		—		—		367.2		362.3		—		—
Goodwill-related	352.6		—		302.7		—		365.2		—		313.6		—
Asset Retirement Obligations	87.5		31.8		41.3		3.3		101.0		30.3		39.0		17.0
Other Regulatory Assets	169.2		27.4		71.7		12.4		137.4		27.6		78.4		15.8
Total Regulatory Assets	5,153.3		1,673.8		1,420.3		953.5		5,239.3		1,645.2		1,524.5		940.8
Less:  Current Portion	436.7		128.8		193.5		61.4		741.9		200.3		333.9		130.1
Total Long-Term Regulatory Assets	$	4,716.6	$	1,545.0	$	1,226.8	$	892.1	$	4,497.4	$	1,444.9	$	1,190.6	$	810.7

Schedule of Regulatory Liabilities

The components of regulatory liabilities were as follows:

	As of September 30, 2018								As of December 31, 2017
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
Excess ADIT due to Tax Cuts and Jobs Act	$	2,876.9	$	1,026.3	$	1,100.5	$	397.4	$	2,882.0	$	1,031.6	$	1,087.9	$	405.1
Cost of Removal	516.4		37.8		305.7		24.9		502.1		23.2		293.8		37.9
Benefit Costs	127.1		—		107.2		0.5		132.3		—		112.6		—
Regulatory Tracker Mechanisms	345.6		111.9		168.3		38.5		136.7		34.6		77.8		5.0
AFUDC - Transmission	68.6		47.8		20.8		—		67.1		48.8		18.3		—
Revenue Subject to Refund	36.2		8.3		3.7		9.4		—		—		—		—
Other Regulatory Liabilities	80.7		25.7		28.3		2.8		45.2		12.9		3.7		2.7
Total Regulatory Liabilities	4,051.5		1,257.8		1,734.5		473.5		3,765.4		1,151.1		1,594.1		450.7
Less:  Current Portion	344.7		126.6		168.2		39.7		128.1		39.0		79.6		6.3
Total Long-Term Regulatory Liabilities	$	3,706.8	$	1,131.2	$	1,566.3	$	433.8	$	3,637.3	$	1,112.1	$	1,514.5	$	444.4