| **Ameren                Corporation****Computation                of Ratio of Earnings to Fixed Charges****(Thousands                of Dollars, Except Ratios)** |                              |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------|
|                                                                                                                                                              |                              |   |   |   |   |
|                                                                                                                                                              |                              |   |   |   |   |
|                                                                                                                                                              | **9                Months Ended** |   |   | **Year                Ended** |   |
|                                                                                                                                                              | **September                30,**  |   |   | **December                31,** |   |
|                                                                                                                                                              | **2007**                          |   |   | **2006** |   |
| Net                income from continuing operations                                                                                                              | $                                 | 509,606 |   |   | $ | 546,738 |   |
| Less-                Change in accounting principle                                                                                                               |                              | - |   |   |   | - |   |
| Less-                Minority interest                                                                                                                            |                              | (19,884 | ) |   |   | (27,135 | ) |
| Add-                Taxes based on income                                                                                                                         |                              | 278,773 |   |   |   | 283,825 |   |
|                                                                                                                                                              |                              |   |   |   |   |   |   |
| Net                income before income taxes, change in accounting principle, and minority                interest                                               |                              | 808,263 |   |   |   | 857,698 |   |
|                                                                                                                                                              |                              |   |   |   |   |   |   |
| Add-                fixed charges:                                                                                                                                |                              |   |   |   |   |   |   |
| Interest                on long term debt                                                                                                                         |                              | 314,402 | (1) |   |   | 345,410 |   |
| Estimated                interest cost within rental expense                                                                                                      |                              | 3,521 |   |   |   | 4,081 |   |
| Amortization                of net debt premium, discount,     and                expenses                                               |                              | 14,179 |   |   |   | 15,341 |   |
| Subsidiary                preferred stock dividends                                                                                                               |                              | 8,162 |   |   |   | 10,936 |   |
| Adjust                preferred stock dividends to pre-taxbasis                                                                                                   |                              | 4,394 |   |   |   | 5,565 |   |
| Total                fixed charges                                                                                                                                |                              | 344,658 |   |   |   | 381,333 |   |
|                                                                                                                                                              |                              |   |   |   |   |   |   |
| Less:                Adjustment of preferred stock dividends to pre-tax basis                                                                                     |                              | 4,394 |   |   |   | 5,565 |   |
|                                                                                                                                                              |                              |   |   |   |   |   |   |
| Earnings                available for fixed charges                                                                                                               | $                                 | 1,148,527 |   |   | $ | 1,233,466 |   |
|                                                                                                                                                              |                              |   |   |   |   |   |   |
| Ratio                of earnings to fixed charges                                                                                                                 |                              | 3.33 |   |   |   | 3.23 |   |