Exhibit 12.1

NSTAR Electric Company

Ratio of Earnings to Fixed Charges

(Unaudited)

	Six Months Ended			For the Years Ended December 31,
(Thousands of Dollars)	June 30, 2012			2011			2010			2009			2008			2007
Earnings, as defined:
Net income	$	49,422		$	252,494		$	248,575		$	240,691		$	223,897		$	216,502
Income tax expense		32,847			165,686			162,020			151,224			141,847			135,260
Equity in earnings of regional nuclear generating companies		(199	)		(501	)		(836	)		(891	)		(820	)		(1,495	)
Dividends received from regional equity investees		264			676			669			1,661			416			1,637
Fixed charges, as below		38,519			76,219			77,902			84,826			103,661			105,338
Less: Interest capitalized (including AFUDC) (b)		171			(185	)		(108	)		76			(1,926	)		(3,866	)
Total earnings, as defined	$	121,024		$	494,389		$	488,222		$	477,587		$	467,075		$	453,376
Fixed charges, as defined:
Interest on long-term debt (a) (b)	$	44,567		$	90,040		$	90,636		$	83,261		$	76,793		$	59,799
Interest on rate reduction bonds (b)		2,253			7,226			11,229			18,833			27,076			35,061
Other interest (b) (c)		(11,433	)		(27,839	)		(30,475	)		(24,519	)		(9,789	)		(414	)
Rental interest factor		3,303			6,607			6,404			7,327			7,655			7,026
Interest capitalized (including AFUDC) (b)		(171	)		185			108			(76	)		1,926			3,866
Total fixed charges, as defined	$	38,519		$	76,219		$	77,902		$	84,826		$	103,661		$	105,338
Ratio of Earnings to Fixed Charges		3.14			6.49			6.27			5.63			4.51			4.30

(a) Interest on long-term debt includes amortized premiums, discounts and capitalized expenses related to indebtedness.

(b) Prior period amounts have been reclassified for comparative purposes and in order to conform to NU’s presentation.

(c) For the year ended December 31, 2007, other interest includes interest related to accounting for uncertain tax positions.