| 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) |                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------|
|                                                                                                                                                                                                                   |                |   |   |   |   |
|                                                                                                                                                                                                                   |                |   |   |   |   |
|                                                                                                                                                                                                                   | 3      Months Ended |   | Year      Ended |   |
|                                                                                                                                                                                                                   | March      31,      |   |   | December      31, |   |
|                                                                                                                                                                                                                   | 2008                |   |   | 2007 |   |
| Net      income from continuing operations                                                                                                                                                                             | $                   | 2,899 |   |   | $ | 16,535 |   |
| Add-      Taxes based on income                                                                                                                                                                                        |                | 1,135 |   |   |   | 9,322 |   |
|                                                                                                                                                                                                                   |                |   |   |   |   |   |   |
| Net      income before income taxes                                                                                                                                                                                    |                | 4,034 |   |   |   | 25,857 |   |
|                                                                                                                                                                                                                   |                |   |   |   |   |   |   |
| Add-      fixed charges:                                                                                                                                                                                               |                |   |   |   |   |   |   |
| Interest on long term      debt  (1)                                                                                                                                                                         |                | 6,741 |   |   |   | 36,670 |   |
| Estimated      interest cost within rental expense                                                                                                                                                                     |                | 90 |   |   |   | 899 |   |
| Amortization      of net debt premium, discount,     and      expenses                                                                                                                        |                | 256 |   |   |   | 1,105 |   |
| Total      fixed charges                                                                                                                                                                                               |                | 7,087 |   |   |   | 38,674 |   |
|                                                                                                                                                                                                                   |                |   |   |   |   |   |   |
| Earnings      available for fixed charges                                                                                                                                                                              |                | 11,121 |   |   |   | 64,531 |   |
|                                                                                                                                                                                                                   |                |   |   |   |   |   |   |
| Ratio      of earnings to fixed charges                                                                                                                                                                                |                | 1.56 |   |   |   | 1.66 |   |
|                                                                                                                                                                                                                   |                |   |   |   |   |   |   |
| Earnings      required for combined fixedcharges      and preferred stock dividends:                                                                                                                                   |                |   |   |   |
| Preferred      stock dividends                                                                                                                                                                                         |                | 628 |   |   |   | 2,512 |   |
| Adjustment      to pre-tax basis                                                                                                                                                                                       |                | 246 |   |   |   | 1,416 |   |
|                                                                                                                                                                                                                   |                | 874 |   |   |   | 3,928 |   |
|                                                                                                                                                                                                                   |                |   |   |   |   |   |   |
| Combined      fixed charges and preferred stock     dividend      requirements                                                                                                                | $                   | 7,961 |   |   | $ | 42,602 |   |
|                                                                                                                                                                                                                   |                |   |   |   |   |   |   |
| Ratio      of earnings to combined fixed charges     and      preferred stock dividend requirements                                                                                           |                | 1.39 |   |   |   | 1.51 |   |
|                                                                                                                                                                                                                   |                |   |   |   |   |   |   |
|                                                                                                                                                                                                                   |                |   |   |   |   |   |   |
| (1)  Includes      FIN 48 interest expense                                                                                                                                                                   |                |   |   |   |   |   |   |