Exhibit 12.1

NSTAR Electric Company

Computation of Ratio of Earnings to Fixed Charges

Twelve Months Ended March 31, 2011

(in thousands)

Net income from continuing operations	$	248,756
Less: equity income from investees		912
Plus: distributed income of equity investees		669
Income taxes		162,543
Fixed charges (including securitization certificates)		76,299
Total	$	487,355
Interest expense	$	69,895
Interest component of rentals (estimated as one-third of rental expense)		6,404
Total	$	76,299
Ratio of earnings to fixed charges		6.39

Exhibit 12.2

NSTAR Electric Company

Computation of Ratio of Earnings to Fixed Charges

and Preferred Stock Dividend Requirements

Twelve Months Ended March 31, 2011

(in thousands)

Net income from continuing operations (before preferred stock dividend)	$	248,756
Less: equity income from investees		912
Plus: distributed income of equity investees		669
Income taxes		162,543
Fixed charges (including securitization certificates)		76,299
Total	$	487,355
Interest expense	$	69,895
Interest component of rentals (estimated as one-third of rental expense)		6,404
Subtotal		76,299
Preferred stock dividend requirements		3,241
Total	$	79,540
Ratio of earnings to fixed charges and preferred stock dividend requirements		6.13