Exhibit 12 UNION ELECTRIC COMPANY COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES AND PREFERRED STOCK DIVIDENDS 12 Months Year Ended December 31, Ended June 30, 1994 1995 1996 1997 1998 1999 ---- ---- ---- ---- ---- ---- Thousands of Dollars Except Ratios Net Income $320,757 $314,107 $304,876 $301,655 $320,070 $337,929 Add-Extraordinary items net of tax - - - 26,967 - - -------- -------- -------- -------- -------- -------- Net Income from continuing operations 320,757 314,107 304,876 328,622 320,070 337,929 -------- -------- -------- -------- -------- -------- Taxes based on income 203,827 207,734 196,210 199,763 212,554 227,806 -------- -------- -------- -------- -------- -------- Net income before income taxes 524,584 521,841 501,086 528,385 532,624 565,735 -------- -------- -------- -------- -------- -------- Add- fixed charges: Interest on long term debt 117,838 121,738 120,547 125,705 124,766 119,962 Other interest 17,770 7,501 7,828 9,299 1,660 3,654 Rentals 1,299 3,330 3,458 3,727 3,416 3,635 Amortization of net debt premium, discount, expenses and losses 5,504 5,502 4,269 3,672 3,522 3,489 -------- -------- -------- -------- -------- -------- Total fixed charges 142,411 138,071 136,102 142,403 133,364 130,740 -------- -------- -------- -------- -------- -------- Earnings available for fixed charges 666,995 659,912 637,188 670,788 665,988 696,475 ======== ======== ======== ======== ======== ======== Ratio of earnings to fixed charges 4.68 4.78 4.68 4.71 4.99 5.32 ======== ======== ======== ======== ======== ======== Earnings required for preferred dividends: Preferred stock dividends 13,252 13,250 13,249 8,817 8,817 8,817 Adjustment to pre-tax basis 7,262 7,558 7,363 4,257 4,649 4,719 -------- -------- -------- -------- -------- -------- 20,514 20,808 20,612 13,074 13,466 13,536 Fixed charges plus preferred stock dividend requirements 162,925 158,879 156,714 155,477 146,830 144,276 ======== ======== ======== ======== ======== ======== Ratio of earnings to fixed charges plus preferred stock dividend requirements 4.09 4.15 4.06 4.31 4.53 4.82 ======== ======== ======== ======== ======== ========