NSTAR Electric Company and Subsidiary

Exhibit 12

Ratio of Earnings to Fixed Charges

(Unaudited)

Nine Months

Ended

September 30,

For the Years Ended December 31,

(Thousands of Dollars)

2014

2013

2012

2011

2010

2009

Earnings, as defined:

   Net income

$ 

 233,791 

$ 

 268,546 

$ 

 190,242 

$ 

252,494 

$ 

 248,575 

$ 

 240,691 

   Income tax expense

 156,655 

 172,866 

 123,966 

165,686 

 162,020 

 151,224 

   Equity in earnings of regional nuclear

     generating and transmission companies

 (32)

 (550)

 (412)

(501)

 (836)

 (891)

   Dividends received from regional equity investees

 - 

 344 

 286 

676 

 669 

 1,661 

   Fixed charges, as below

 62,261 

73,115 

72,364 

76,219 

77,902 

84,826 

   Less: Interest capitalized (including AFUDC)

 (1,504)

(511)

(259)

(185)

(108)

76 

 Total earnings, as defined

$ 

 451,171 

$ 

 513,810 

$ 

386,187 

$ 

 494,389 

$ 

 488,222 

$ 

 477,587 

Fixed charges, as defined:

   Interest on long-term debt (a)

$ 

 58,485 

$ 

 79,088 

$ 

 87,100 

$ 

90,040 

$ 

 90,630 

$ 

 83,261 

   Interest on rate reduction bonds

 - 

 399 

 3,585 

7,226 

 11,235 

 18,833 

   Other interest (b)

 606 

 (9,104)

 (20,631)

(27,839)

 (30,475)

 (24,519)

   Rental interest factor

 1,666 

 2,221 

 2,051 

6,607 

 6,404 

 7,327 

   Interest capitalized (including AFUDC)

 1,504 

 511 

 259 

185 

 108 

 (76)

 Total fixed charges, as defined

$ 

 62,261 

$ 

 73,115 

$ 

72,364 

$ 

 76,219 

$ 

 77,902 

$ 

 84,826 

Ratio of Earnings to Fixed Charges

 7.25 

 7.03 

 5.34 

 6.49 

 6.27 

 5.63 

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

(b) For the years ended December 31, 2011, 2010, and 2009, other interest includes interest related to accounting for uncertain tax positions.