NSTAR Electric Company												Exhibit 12
Ratio of Earnings to Fixed Charges
(Unaudited)
(Thousands of Dollars)		Nine Months
		Ended	For the Years Ended December 31,
		September 30, 2012		2011		2010		2009		2008		2007
Earnings, as defined:
Net income	$	156,184	$	252,494	$	248,575	$	240,691	$	223,897	$	216,502
Income tax expense		102,220		165,686		162,020		151,224		141,847		135,260
Equity in earnings of regional nuclear
generating companies		(301)		(501)		(836)		(891)		(820)		(1,495)
Dividends received from regional equity investees		286		676		669		1,661		416		1,637
Fixed charges, as below		59,131		76,219		77,902		84,826		103,661		105,338
Less: Interest capitalized (including AFUDC) (b)		(254)		(185)		(108)		76		(1,926)		(3,866)
Total earnings, as defined	$	317,266	$	494,389	$	488,222	$	477,587	$	467,075	$	453,376
Fixed charges, as defined:
Interest on long-term debt (a) (b)	$	66,953	$	90,040	$	90,636	$	83,261	$	76,793	$	59,799
Interest on rate reduction bonds (b)		3,106		7,226		11,229		18,833		27,076		35,061
Other interest (b) (c)		(16,137)		(27,839)		(30,475)		(24,519)		(9,789)		(414)
Rental interest factor		4,955		6,607		6,404		7,327		7,655		7,026
Interest capitalized (including AFUDC) (b)		254		185		108		(76)		1,926		3,866
Total fixed charges, as defined	$	59,131	$	76,219	$	77,902	$	84,826	$	103,661	$	105,338
Ratio of Earnings to Fixed Charges		5.37		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.