| 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) |                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------|
|                                                                                                                                                                                                                   |                |   |   |   |   |
|                                                                                                                                                                                                                   |                |   |   |   |   |
|                                                                                                                                                                                                                   | 6      Months Ended |   |   | Year      Ended |   |
|                                                                                                                                                                                                                   | June      30,       |   |   | December      31, |   |
|                                                                                                                                                                                                                   | 2008                |   |   | 2007 |   |
| Net      income from continuing operations                                                                                                                                                                             | $                   | 690 |   |   | $ | 16,535 |   |
| Add-      Taxes based on income                                                                                                                                                                                        |                | 156 |   |   |   | 9,322 |   |
| Net      income before income taxes                                                                                                                                                                                    |                | 846 |   |   |   | 25,857 |   |
|                                                                                                                                                                                                                   |                |   |   |   |   |   |   |
| Add-      fixed charges:                                                                                                                                                                                               |                |   |   |   |   |   |   |
| Interest on long term      debt (1)                                                                                                                                                                               |                | 14,402 |   |   |   | 36,670 |   |
| Estimated      interest cost within rental expense                                                                                                                                                                     |                | 302 |   |   |   | 899 |   |
| Amortization      of net debt premium, discount,     and      expenses                                                                                                                        |                | 513 |   |   |   | 1,105 |   |
| Total      fixed charges                                                                                                                                                                                               |                | 15,217 |   |   |   | 38,674 |   |
|                                                                                                                                                                                                                   |                |   |   |   |   |   |   |
| Earnings      available for fixed charges                                                                                                                                                                              |                | 16,063 |   |   |   | 64,531 |   |
|                                                                                                                                                                                                                   |                |   |   |   |   |   |   |
| Ratio      of earnings to fixed charges                                                                                                                                                                                |                | 1.05 |   |   |   | 1.66 |   |
|                                                                                                                                                                                                                   |                |   |   |   |   |   |   |
| Earnings      required for combined fixedcharges      and preferred stock dividends:                                                                                                                                   |                |   |   |   |
| Preferred      stock dividends                                                                                                                                                                                         |                | 1,256 |   |   |   | 2,512 |   |
| Adjustment      to pre-tax basis                                                                                                                                                                                       |                | 284 |   |   |   | 1,416 |   |
|                                                                                                                                                                                                                   |                | 1,540 |   |   |   | 3,928 |   |
|                                                                                                                                                                                                                   |                |   |   |   |   |   |   |
| Combined      fixed charges and preferred stockdividend      requirements                                                                                                                                              | $                   | 16,757 |   |   | $ | 42,602 |   |
|                                                                                                                                                                                                                   |                |   |   |   |   |   |   |
| Ratio      of earnings to combined fixed chargesand      preferred stock dividend requirements                                                                                                                         |                | - |  (2) |   |   | 1.51 |   |
|                                                                                                                                                                                                                   |                |   |   |   |   |   |   |
| (1)  Includes      FIN 48 interest expense                                                                                                                                                              |                |   |   |   |   |   |   |
| (2)      Earnings were inadequate to cover fixed charges by $694 thousand for the      six months ended June 30, 2008.                                                                                            |                |   |   |   |   |   |   |