Basic EPS is computed based upon the weighted average number of common shares outstanding during each period. Diluted EPS is computed on the basis of the weighted average number of common shares outstanding plus the potential dilutive effect if certain share-based compensation awards are converted into common shares. For the three months ended March 31, 2013, there were 6,299 share awards excluded from the computation as these awards were antidilutive. There were no antidilutive share awards for the three months ended March 31, 2012.

		For the Three Months Ended March 31,
(Millions of Dollars, except share information)		2013		2012
Net Income Attributable to Controlling Interest		$	228.1	$	99.3

Weighted Average Common Shares Outstanding:
	Basic		315,129,782		178,055,716
	Dilutive Effect		872,756		381,737
	Diluted		316,002,538		178,437,453
Basic and Diluted EPS		$	0.72	$	0.56

On April 10, 2012, NU issued approximately 136 million common shares as a result of the merger with NSTAR, which are reflected in weighted average common shares outstanding as of March 31, 2013.

RSUs and performance shares are included in basic weighted average common shares outstanding as of the date that all necessary vesting conditions have been satisfied. The dilutive effect of unvested RSUs and performance shares is calculated using the treasury stock method. Assumed proceeds of these units under the treasury stock method consist of the remaining compensation cost to be recognized and a theoretical tax benefit. The theoretical tax benefit is calculated as the tax impact of the intrinsic value of the units (the difference between the market value of the average units outstanding for the period, using the average market price during the period, and the grant date market value).

The dilutive effect of stock options to purchase common shares is also calculated using the treasury stock method. Assumed proceeds for stock options consist of cash proceeds that would be received upon exercise, and a theoretical tax benefit. The theoretical tax benefit is calculated as the tax impact of the intrinsic value of the stock options (the difference between the market value of the average stock options outstanding for the period, using the average market price during the period, and the exercise price).