Exhibit 12(a) CONSTELLATION ENERGY GROUP, INC. AND SUBSIDIARIES COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES 12 Months Ended ---------------------------------------------------------------------------------------- September December December December December December 2001 2000 1999 1998 1997 1996 ----------- ------------ ------------ ------------ ------------ ------------ (In Millions of Dollars) Income from Continuing Operations (Before Extraordinary Loss and Cumulative Effect of Change in Accounting Principle) $ 428.7 $ 345.3 $ 326.4 $ 305.9 $ 254.1 $ 272.3 Taxes on Income, Including Tax Effect for BGE Preference Stock Dividends 249.2 221.4 182.5 169.3 145.1 148.3 ----------- ------------ ------------ ------------ ------------ ------------ Adjusted Income $ 677.9 $ 566.7 $ 508.9 $ 475.2 $ 399.2 $ 420.6 ----------- ------------ ------------ ------------ ------------ ------------ Fixed Charges: Interest and Amortization of Debt Discount and Expense and Premium on all Indebtedness $ 238.7 $ 261.5 $ 245.7 $ 255.3 $ 234.2 $ 203.9 Earnings required for BGE Preference Stock Dividends 21.9 21.9 21.0 33.8 45.1 59.4 Capitalized Interest 32.8 21.1 2.7 3.6 8.4 15.7 Interest Factor in Rentals 2.0 2.2 1.8 1.9 1.9 1.5 ----------- ------------ ------------ ------------ ------------ ------------ Total Fixed Charges $ 295.4 $ 306.7 $ 271.2 $ 294.6 $ 289.6 $ 280.5 ----------- ------------ ------------ ------------ ------------ ------------ Earnings (1) $ 940.5 $ 852.3 $ 777.4 $ 766.2 $ 680.4 $ 685.4 =========== ============ ============ ============ ============ ============ Ratio of Earnings to Fixed Charges 3.18 2.78 2.87 2.60 2.35 2.44 (1) Earnings are deemed to consist of income from continuing operations (before extraordinary loss and cumulative effect of change in accounting principle) that includes earnings of Constellation Energy's consolidated subsidiaries, equity in the net income of unconsolidated subsidiaries, income taxes (including deferred income taxes, investment tax credit adjustments, and the tax effect of BGE's preference stock dividends), and fixed charges other than capitalized interest.