1

                                                                   EXHIBIT 12(b)

                             UNION ELECTRIC COMPANY
               COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES
                                      AND
                     PREFERRED STOCK DIVIDEND REQUIREMENTS



                                                                                                               12 Months
                                                                    Year Ended December 31,                      Ended
                                                ------------------------------------------------------------- September 30,       
                                                1990          1991         1992         1993          1994       1995
                                                ----          ----         ----         ----          ----       ----
                                                              (Thousands of Dollars Except Ratios)

                                                                                              
Net income for the period                     $294,219     $321,512      $302,748     $297,160     $320,757     $305,530
   Add:
      Taxes based on income                    191,532      218,954       197,009      182,716      203,827      196,875
      Fixed charges (see below)                188,698      168,380       136,227      130,914      142,411      137,954
                                               -------     --------      --------     --------     --------     --------

Earnings available for fixed charges
   and preferred stock dividend
   requirements of Registrant                 $674,449     $708,846      $635,984     $610,790     $666,995     $640,359
                                              ========     ========      ========     ========     ========     ========

Fixed charges:
   Interest on debt                           $183,215     $163,061      $125,798     $124,430     $135,608     $129,605
   Amortization of premium and discount,
      less expense, on debt; and
      bond defeasance cost                       4,369        4,148         9,521        5,170        5,504        5,503
   Rentals (see note)                            1,114        1,171           908        1,314        1,299        2,846
                                              --------     --------      --------     --------     --------     --------
      Total fixed charges                     $188,698     $168,380      $136,227     $130,914     $142,411     $137,954

Preferred stock dividend requirements
   of Registrant *(Adjusted for income
   tax effect)                                  22,901       22,213        21,852       21,537       20,514       20,613
                                              --------     --------      --------     --------     --------     --------


Total fixed charges and preferred
   stock dividend requirements                $211,599     $190,593      $158,079     $152,451     $162,925     $158,567
                                              ========     ========      ========     ========     ========     ========


Ratio of earnings to fixed charges
   and preferred dividends                        3.19         3.72          4.02         4.01         4.09         4.04
                                                  ====         ====          ====         ====         ====         ====



Note:  Represents the interest factor applicable to rentals.
*  See following page for supporting computation.
   2

                                                                   EXHIBIT 12(b)
                                                                    (continued)

                             UNION ELECTRIC COMPANY
               COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES
                                      AND
                     PREFERRED STOCK DIVIDEND REQUIREMENTS


                                                                                                                 12 Months
                                                                    Year Ended December 31,                       Ended
                                                -------------------------------------------------------------   September 30,       
                                                1990          1991         1992         1993          1994        1995
                                                ----          ----         ----         ----          ----        ----
                                                              (Thousands of Dollars Except Ratios)
                                                                                              
Computation of preferred stock
   dividend requirements of Registrant,
   adjusted for income tax effect*
      Preferred stock dividend
         requirements of Registrant, as
         shown on statement of earnings        $14,693      $14,059       $14,058      $14,087      $13,252      $13,250

Less deductible preferred stock
   dividends**                                   2,085        2,085         2,085        1,973        1,816        1,816
                                               -------      -------       -------      -------      -------      -------

Non-deductible preferred stock
   dividends                                   $12,608      $11,974       $11,973      $12,114      $11,436      $11,434
                                               =======      =======       =======      =======      =======      =======

Excess of net income before income
   taxes over net income (percentage)
   See note below                                65.1%        68.1%         65.1%        61.5%        63.5%        64.4%
                                                 -----        -----         -----        -----        -----        -----

Income tax effect on non-deductible
   preferred stock dividends*                   $8,208       $8,154        $7,794       $7,450       $7,262       $7,363
Add:
   Deductible preferred stock
      dividends (above)                          2,085        2,085         2,085        1,973        1,816        1,816
   Non-deductible preferred stock
      dividends (above)                         12,608       11,974        11,973       12,114       11,436       11,434
                                                ------       ------        ------       ------       ------       ------

Preferred stock dividend requirements
   of Registrant. (Adjusted for income tax
   effect)                                     $22,901      $22,213       $21,852      $21,537      $20,514      $20,613
                                               =======      =======       =======      =======      =======      =======

Note:  Calculated as follows -
   Net income before income taxes             $485,751     $540,466      $499,757     $479,876     $524,584     $502,405
   Less net income                             294,219      321,512       302,748      297,160      320,757      305,530
                                              --------     --------      --------     --------     --------     --------
   Excess - Taxed based on income             $191,532     $218,954      $197,009     $182,716     $203,827     $196,875
                                              ========     ========      ========     ========     ========     ========
   - Percentage of net income                    65.1%        68.1%         65.1%        61.5%        63.5%        64.4%
                                                 =====        =====         =====        =====        =====        =====



*  Income tax adjustment to reflect pretax earnings required to meet preferred
   stock dividend.
** Dividends deductible on federal income tax return.