| Ameren      CorporationComputation      of Ratio of Earnings to Fixed Charges(Thousands      of Dollars, Except Ratios) |                |
|-------------------------------------------------------------------------------------------------------------------------|---------------------|
|                                                                                                                    |                |   |   |   |   |
|                                                                                                                    |                |   |   |   |   |
|                                                                                                                    | 9      Months Ended |   |   | Year      Ended |   |
|                                                                                                                    | September      30,  |   |   | December      31, |   |
|                                                                                                                    | 2008                |   |   | 2007 |   |
| Net      income from continuing operations                                                                              | $                   | 547,554 |   |   | $ | 617,804 |   |
| Less-      Minority interest                                                                                            |                | (24,671 | ) |   |   | (27,266 | ) |
| Add-      Taxes based on income                                                                                         |                | 319,096 |   |   |   | 330,141 |   |
|                                                                                                                    |                |   |   |   |   |   |   |
| Net      income before income taxes and minority interest                                                               |                | 891,321 |   |   |   | 975,211 |   |
|                                                                                                                    |                |   |   |   |   |   |   |
| Add-      fixed charges:                                                                                                |                |   |   |   |   |   |   |
| Interest on long term      debt  (1)                                                                          |                | 329,865 |   |   |   | 421,406 |   |
| Estimated      interest cost within rental expense                                                                      |                | 4,489 |   |   |   | 5,020 |   |
| Amortization      of net debt premium, discount,     and      expenses                         |                | 14,473 |   |   |   | 18,638 |   |
| Subsidiary      preferred stock dividends                                                                               |                | 7,888 |   |   |   | 10,871 |   |
| Adjust      preferred stock dividends to pre-taxbasis                                                                   |                | 4,532 |   |   |   | 5,709 |   |
| Total      fixed charges                                                                                                |                | 361,247 |   |   |   | 461,644 |   |
|                                                                                                                    |                |   |   |   |   |   |   |
| Less:      Adjustment of preferred stock dividends to pre-tax basis                                                     |                | 4,532 |   |   |   | 5,709 |   |
|                                                                                                                    |                |   |   |   |   |   |   |
| Earnings      available for fixed charges                                                                               | $                   | 1,248,036 |   |   | $ | 1,431,146 |   |
|                                                                                                                    |                |   |   |   |   |   |   |
| Ratio      of earnings to fixed charges                                                                                 |                | 3.45 |   |   |   | 3.10 |   |