**Exhibit      12.4**

| **Ameren                  Energy Generating Company****Computation                  of Ratio of Earnings to Fixed Charges****(Thousands                  of Dollars, Except Ratios)** |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|                                                                                                                                                                                  |   |   |   |   |
|                                                                                                                                                                                  | **Nine                  Months** |   | **Year** |   |
|                                                                                                                                                                                  | **Ended** |   | **Ended** |   |
|                                                                                                                                                                                  | **September                  30,** |   | **December                  31,** |   |
|                                                                                                                                                                                  | **2006** |   | **2005** |   |
| Net                  income from continuing operations                                                                                                                                | $ | 27,068 |   | $ | 96,732 |   |
| Less-                  Change in accounting principle                                                                                                                                 |   | - |   |   | (15,600 | ) |
| Add-                  Taxes based on income                                                                                                                                           |   | 6,686 |   |   | 72,433 |   |
|                                                                                                                                                                                  |   |   |   |   |   |   |
| Net                  income before income taxes and change in accounting                  principle                                                                                   |   | 33,754 |   |   | 184,765 |   |
|                                                                                                                                                                                  |   |   |   |   |   |   |
| Add-                  fixed charges:                                                                                                                                                  |   |   |   |   |   |   |
| Interest                  on long term debt                                                                                                                                           |   | 44,720 |   |   | 71,720 |   |
| Estimated                  interest cost within rental expense                                                                                                                        |   | 82 |   |   | - |   |
| Amortization                  of net debt premium, discount,and                  expenses                                                                                             |   | 440 |   |   | 1,345 |   |
|                                                                                                                                                                                  |   |   |   |   |   |   |
| Total                  fixed charges                                                                                                                                                  |   | 45,242 |   |   | 73,065 |   |
|                                                                                                                                                                                  |   |   |   |   |   |   |
| Earnings                  available for fixed charges                                                                                                                                 |   | 78,996 |   |   | 257,830 |   |
|                                                                                                                                                                                  |   |   |   |   |   |   |
| Ratio                  of earnings to fixed charges                                                                                                                                   |   | 1.74 |   |   | 3.52 |   |
|                                                                                                                                                                                  |   |   |   |   |   |   |