| **Central                  Illinois Public Service Company****Computation                  of Ratios of Earnings to Fixed Charges and Combined****Fixed                  Charges and Preferred Stock Dividend Requirements****(Thousands                  of Dollars, Except Ratios)** |                                |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-------------------------------------|
|                                                                                                                                                                                                                                                                                   |                                |   |   |   |   |
|                                                                                                                                                                                                                                                                                   |                                |   |   |   |   |
|                                                                                                                                                                                                                                                                                   | **9                  Months Ended** |   |   | **Year                  Ended** |   |
|                                                                                                                                                                                                                                                                                   | **September                  30,**  |   |   | **December                  31,** |   |
|                                                                                                                                                                                                                                                                                   | **2007**                            |   |   | **2006** |   |
| Net                  income from continuing operations                                                                                                                                                                                                                                 | $                                   | 18,955 |   |   | $ | 37,372 |   |
| Add-                  Taxes based on income                                                                                                                                                                                                                                            |                                | 10,806 |   |   |   | 15,539 |   |
|                                                                                                                                                                                                                                                                                   |                                |   |   |   |   |   |   |
| Net                  income before income taxes                                                                                                                                                                                                                                        |                                | 29,761 |   |   |   | 52,911 |   |
|                                                                                                                                                                                                                                                                                   |                                |   |   |   |   |   |   |
| Add-                  fixed charges:                                                                                                                                                                                                                                                   |                                |   |   |   |   |   |   |
| Interest                  on long term debt                                                                                                                                                                                                                                            |                                | 27,446 | (1) |   |   | 29,932 |   |
| Estimated                  interest cost within rental expense                                                                                                                                                                                                                         |                                | 656 |   |   |   | 726 |   |
| Amortization                  of net debt premium, discount,and                  expenses                                                                                                                                                                                              |                                | 849 |   |   |   | 1,025 |   |
| Total                  fixed charges                                                                                                                                                                                                                                                   |                                | 28,951 |   |   |   | 31,683 |   |
|                                                                                                                                                                                                                                                                                   |                                |   |   |   |   |   |   |
| Earnings                  available for fixed charges                                                                                                                                                                                                                                  |                                | 58,712 |   |   |   | 84,594 |   |
|                                                                                                                                                                                                                                                                                   |                                |   |   |   |   |   |   |
| Ratio                  of earnings to fixed charges                                                                                                                                                                                                                                    |                                | 2.02 |   |   |   | 2.67 |   |
|                                                                                                                                                                                                                                                                                   |                                |   |   |   |   |   |   |
| Earnings                  required for combined fixedcharges                  and preferred stock dividends:                                                                                                                                                                           |                                |   |   |   |   |
| Preferred                  stock dividends                                                                                                                                                                                                                                             |                                | 1,884 |   |   |   | 2,512 |   |
| Adjustment                  to pre-tax basis                                                                                                                                                                                                                                           |                                | 1,074 |   |   |   | 1,045 |   |
|                                                                                                                                                                                                                                                                                   |                                | 2,958 |   |   |   | 3,557 |   |
|                                                                                                                                                                                                                                                                                   |                                |   |   |   |   |   |   |
| Combined                  fixed charges and preferred stockdividend                  requirements                                                                                                                                                                                      | $                                   | 31,909 |   |   | $ | 35,240 |   |
|                                                                                                                                                                                                                                                                                   |                                |   |   |   |   |   |   |
| Ratio                  of earnings to combined fixed chargesand                  preferred stock dividend requirements                                                                                                                                                                 |                                | 1.83 |   |   |   | 2.40 |   |