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 securities are converted into common shares. For the years ended December 31, 2012, 2011 and 2010, there were 4,266, 4,314 and 1,578 share awards, respectively, excluded from the computation as these awards were antidilutive.

		For the Years Ended December 31,
(Millions of Dollars, except share information)		2012		2011		2010
Net Income Attributable to Controlling Interest		$	525.9	$	394.7	$	387.9

Weighted Average Common Shares Outstanding:
	Basic		277,209,819		177,410,167		176,636,086
	Dilutive Effect		783,812		394,401		249,301
	Diluted		277,993,631		177,804,568		176,885,387
Basic EPS		$	1.90	$	2.22	$	2.20
Diluted EPS		$	1.89	$	2.22	$	2.19

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 December 31, 2012.

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).