EXHIBIT 12(a) CONSTELLATION ENERGY GROUP, INC. AND SUBSIDIARIES COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES 12 Months Ended -------------------------------------------- December December December December December 1999 1998 1997 1996 1995 -------- -------- -------- -------- -------- (In Millions of Dollars) Income from Continuing Operations (Before Extraordinary Loss)...... $326.4 $305.9 $254.1 $272.3 $297.4 Taxes on Income, Including Tax Effect for BGE Preference Stock Dividends........................ 182.5 169.3 145.1 148.3 152.0 ------ ------ ------ ------ ------ Adjusted Income................... $508.9 $475.2 $399.2 $420.6 $449.4 ------ ------ ------ ------ ------ Fixed Charges: Interest and Amortization of Debt Discount and Expense and Premium on all Indebtedness............. $245.7 $255.3 $234.2 $203.9 $206.7 Earnings required for BGE Preference Stock Dividends...... 21.0 33.8 45.1 59.4 61.0 Capitalized Interest............. 2.7 3.6 8.4 15.7 15.0 Interest Factor in Rentals....... 1.8 1.9 1.9 1.5 2.1 ------ ------ ------ ------ ------ Total Fixed Charges.............. $271.2 $294.6 $289.6 $280.5 $284.8 ------ ------ ------ ------ ------ Earnings (1)...................... $777.4 $766.2 $680.4 $685.4 $719.2 ====== ====== ====== ====== ====== Ratio of Earnings to Fixed Charges.......................... 2.87 2.60 2.35 2.44 2.52 - -------- (1) Earnings are deemed to consist of income from continuing operations (be- fore extraordinary loss) that includes earnings of Constellation Energy's consolidated subsidiaries, equity in the net income of BGE's unconsoli- dated subsidiary, income taxes (including deferred income taxes, invest- ment tax credit adjustments, and the tax effect of BGE's preference stock dividends), and fixed charges other than capitalized interest. 96