EXHIBIT 12.3 NSTAR Computation of Ratio of Earnings to Fixed Charges Twelve Months Ended December 31, 1999 (in thousands) Net income from continuing operations $146,463 Income taxes 60,141 Fixed charges 145,364 -------- Total $351,968 ======== Interest expense $128,364 Interest component of rentals 17,000 -------- Total $145,364 ======== Ratio of earnings to fixed charges 2.42 ====