SHARE-BASED PAYMENTS (Tables)

12 Months Ended

Dec. 31, 2017

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Disclosure of Share-based Compensation Arrangements by Share-based Payment

The total compensation expense and associated future income tax benefits recognized by Eversource, CL&P, NSTAR Electric and PSNH for share-based compensation awards were as follows:

Eversource	For the Years Ended December 31,
(Millions of Dollars)	2017		2016		2015
Compensation Expense	$	19.7	$	23.6	$	23.1
Future Income Tax Benefit	8.0		9.6		9.4

	For the Years Ended December 31,
	2017						2016						2015
(Millions of Dollars)	CL&P		NSTAR Electric		PSNH		CL&P		NSTAR Electric		PSNH		CL&P		NSTAR Electric		PSNH
Compensation Expense	$	7.0	$	7.0	$	3.2	$	9.1	$	8.2	$	3.5	$	9.3	$	7.5	$	3.2
Future Income Tax Benefit	2.9		2.8		1.3		3.7		3.3		1.4		3.8		3.1		1.3

Restricted Stock Units (RSUs)

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of Share Transactions

A summary of RSU transactions is as follows:

	RSUs (Units)		Weighted Average Grant-Date Fair Value
Outstanding as of December 31, 2016	724,270		$	47.86
Granted	299,285		$	55.97
Shares Issued	(289,635	)	$	52.26
Forfeited	(16,881	)	$	55.60
Outstanding as of December 31, 2017	717,039		$	49.29

Performance Shares

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of Share Transactions

A summary of performance share transactions is as follows:

	Performance Shares (Units)		Weighted Average Grant-Date Fair Value
Outstanding as of December 31, 2016	522,934		$	51.09
Granted	180,032		$	55.70
Shares Issued	(173,914	)	$	43.48
Forfeited	(18,487	)	$	47.06
Outstanding as of December 31, 2017	510,565		$	55.45

Employee Stock Option

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of Share Transactions

A summary of stock option transactions is as follows:

	Options		Weighted Average Exercise Price		Intrinsic Value (Millions)
Outstanding and Exercisable - December 31, 2016	124,640		$	25.84	$	3.7
Exercised	(124,640	)	$	25.84	$	4.4
Outstanding and Exercisable - December 31, 2017	—		$	—	$	—