| **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)** |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|                                                                                                                                                                                                                                                                                           |   |   |   |   |
|                                                                                                                                                                                                                                                                                           | **Six                    Months** |   | **Year** |   |
|                                                                                                                                                                                                                                                                                           | **Ended** |   | **Ended** |   |
|                                                                                                                                                                                                                                                                                           | **June                    30,** |   | **December                    31,** |   |
|                                                                                                                                                                                                                                                                                           | **2006** |   | **2005** |   |
| Net                    income from continuing operations                                                                                                                                                                                                                                       | $ | 12,328 |   | $ | 42,998 |   |
| Add-                    Taxes based on income                                                                                                                                                                                                                                                  |   | 2,034 |   |   | 24,596 |   |
| Net                    income before income taxes                                                                                                                                                                                                                                              |   | 14,362 |   |   | 67,594 |   |
|                                                                                                                                                                                                                                                                                           |   |   |   |   |   |   |
| Add-                    fixed charges:                                                                                                                                                                                                                                                         |   |   |   |   |   |   |
| Interest                    on long term debt                                                                                                                                                                                                                                                  |   | 14,779 |   |   | 28,969 |   |
| Estimated                    interest cost within rental expense                                                                                                                                                                                                                               |   | 267 |   |   | - |   |
| Amortization                    of net debt premium, discount,and                    expenses                                                                                                                                                                                                  |   | 469 |   |   | 953 |   |
| Total                    fixed charges                                                                                                                                                                                                                                                         |   | 15,515 |   |   | 29,922 |   |
|                                                                                                                                                                                                                                                                                           |   |   |   |   |   |   |
| Earnings                    available for fixed charges                                                                                                                                                                                                                                        |   | 29,877 |   |   | 97,516 |   |
|                                                                                                                                                                                                                                                                                           |   |   |   |   |   |   |
| Ratio                    of earnings to fixed charges                                                                                                                                                                                                                                          |   | 1.92 |   |   | 3.25 |   |
|                                                                                                                                                                                                                                                                                           |   |   |   |   |   |   |
| Earnings                    required for combined fixedcharges                    and preferred stock dividends:                                                                                                                                                                               |   |   |   |   |   |   |
| Preferred                    stock dividends                                                                                                                                                                                                                                                   |   | 1,256 |   |   | 2,512 |   |
| Adjustment                    to pre-tax basis                                                                                                                                                                                                                                                 |   | 188 |   |   | 1,437 |   |
|                                                                                                                                                                                                                                                                                           |   | 1,444 |   |   | 3,949 |   |
|                                                                                                                                                                                                                                                                                           |   |   |   |   |   |   |
| Combined                    fixed charges and preferred stockdividend                    requirements                                                                                                                                                                                          | $ | 16,959 |   | $ | 33,871 |   |
|                                                                                                                                                                                                                                                                                           |   |   |   |   |   |   |
| Ratio                    of earnings to combined fixed chargesand                    preferred stock dividend requirements                                                                                                                                                                     |   | 1.76 |   |   | 2.87 |   |