| Central      Illinois Public Service CompanyComputation      of Ratios of Earnings to Fixed Charges and CombinedFixed      Charges and Preferred Stock Dividend Requirements(Thousands      of Dollars, Except Ratios) |                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------|
|                                                                                                                                                                                                                   |                      |   |   |   |   |
|                                                                                                                                                                                                                   |                      |   |   |   |   |
|                                                                                                                                                                                                                   | 9      Months Ended  |   |   | Year      Ended  |   |
|                                                                                                                                                                                                                   | September      30,        |   |   | December      31, |   |
|                                                                                                                                                                                                                   | 2008                      |   |   | 2007 |   |
| Net      income from continuing operations                                                                                                                                                                             | $                         | 6,901 |   |   | $ | 16,535 |   |
| Add-      Taxes based on income                                                                                                                                                                                        |                      | 2,178 |   |   |   | 9,322 |   |
|                                                                                                                                                                                                                   |                      |   |   |   |   |   |   |
| Net      income before income taxes                                                                                                                                                                                    |                      | 9,079 |   |   |   | 25,857 |   |
|                                                                                                                                                                                                                   |                      |   |   |   |   |   |   |
| Add-      fixed charges:                                                                                                                                                                                               |                      |   |   |   |   |   |   |
| Interest on long term      debt  (1)                                                                                                                                                                         |                      | 21,929 |   |   |   | 36,670 |   |
| Estimated      interest cost within rental expense                                                                                                                                                                     |                      | 501 |   |   |   | 899 |   |
| Amortization      of net debt premium, discountand      expenses                                                                                                                                                       |                      | 769 |   |   |   | 1,105 |   |
| Total      fixed charges                                                                                                                                                                                               |                      | 23,199 |   |   |   | 38,674 |   |
|                                                                                                                                                                                                                   |                      |   |   |   |   |   |   |
| Earnings      available for fixed charges                                                                                                                                                                              |                      | 32,278 |   |   |   | 64,531 |   |
|                                                                                                                                                                                                                   |                      |   |   |   |   |   |   |
| Ratio      of earnings to fixed charges                                                                                                                                                                                |                      | 1.39 |   |   |   | 1.66 |   |
|                                                                                                                                                                                                                   |                      |   |   |   |   |   |   |
| Earnings      required for combined fixedcharges      and preferred stock dividends:                                                                                                                                   |                      |   |   |   |
| Preferred      stock dividends                                                                                                                                                                                         |                      | 1,884 |   |   |   | 2,512 |   |
| Adjustment      to pre-tax basis                                                                                                                                                                                       |                      | 595 |   |   |   | 1,416 |   |
|                                                                                                                                                                                                                   |                      | 2,479 |   |   |   | 3,928 |   |
|                                                                                                                                                                                                                   |                      |   |   |   |   |   |   |
| Combined      fixed charges and preferred stockdividend      requirements                                                                                                                                              | $                         | 25,678 |   |   | $ | 42,602 |   |
|                                                                                                                                                                                                                   |                      |   |   |   |   |   |   |
| Ratio      of earnings to combined fixed chargesand      preferred stock dividend requirements                                                                                                                         |                      | 1.25 |   |   |   | 1.51 |   |
|                                                                                                                                                                                                                   |                      |   |   |   |   |   |   |