| Ameren      Energy Generating CompanyComputation      of Ratio of Earnings to Fixed Charges(Thousands      of Dollars, Except Ratios) |                |
|---------------------------------------------------------------------------------------------------------------------------------------|---------------------|
|                                                                                                                                  |                |   |   |   |   |
|                                                                                                                                  |                |   |   |   |   |
|                                                                                                                                  | 6      Months Ended |   |   | Year      Ended |   |
|                                                                                                                                  | June      30,       |   |   | December      31, |   |
|                                                                                                                                  | 2008                |   |   | 2007 |   |
| Net      income from continuing operations                                                                                            | $                   | 120,456 |   |   | $ | 124,894 |   |
| Less-      Change in accounting principle                                                                                             |                | - |   |   |   | - |   |
| Add-      Taxes based on income                                                                                                       |                | 71,397 |   |   |   | 77,799 |   |
| Net      income before income taxes and change in accounting    principle                                                             |                | 191,853 |   |   |   | 202,693 |   |
|                                                                                                                                  |                |   |   |   |   |   |   |
| Add-      fixed charges:                                                                                                              |                |   |   |   |   |   |   |
| Interest on long term      debt (1)                                                                                              |                | 24,990 |   |   |   | 54,783 |   |
| Estimated      interest cost within rental expense                                                                                    |                | 85 |   |   |   | 164 |   |
| Amortization      of net debt premium, discount,     and      expenses                                       |                | 343 |   |   |   | 586 |   |
|                                                                                                                                  |                |   |   |   |   |   |   |
| Total      fixed charges                                                                                                              |                | 25,418 |   |   |   | 55,533 |   |
|                                                                                                                                  |                |   |   |   |   |   |   |
| Earnings      available for fixed charges                                                                                             | $                   | 217,271 |   |   | $ | 258,226 |   |
|                                                                                                                                  |                |   |   |   |   |   |   |
| Ratio      of earnings to fixed charges                                                                                               |                | 8.54 |   |   |   | 4.64 |   |
|                                                                                                                                  |                |   |   |   |   |   |   |
| (1)  Includes      FIN 48 interest expense                                                                                  |                |   |   |   |   |   |   |