Exhibit 12.4

Ameren Energy Generating Company

Computation of Ratio of Earnings to Fixed Charges

(Thousands of Dollars, Except Ratios)



|                                                                  |  |                         |         |   |      |   |         |  |      |         |      |   |         |  |   |         |  
|----------------------------------------------------------------- |  | ----------------------- | ------- | - | ---- | - | ------- |  | ---- | ------- | ---- | - | ------- |  | - | ------- | -
|                                                                  |  | Year Ended December 31, |        
|                                                                  |  | 2001                    |         |   | 2002 |   | 2003    |  | 2004 |         | 2005 |  
|Net income from continuing operations                             |  | $                       | 75,924  |   |      | $ | 31,837  |  | $    | 75,185  |      | $ | 107,292 |  | $ | 96,732  |  
|Less- Change in accounting principle                              |  |                         | (1,993  | ) |      |   | -       |  |      | 18,416  |      |   | -       |  |   | (15,600 | )
|Add- Taxes based on income                                        |  |                         | 47,296  |   |      |   | 20,340  |  |      | 38,538  |      |   | 64,245  |  |   | 72,433  |  
|                                                                  |  |                         |         |   |      |   |         |  |      |         |      |   |         |  |   |         |  
|Net income before income taxes and change in accounting principle |  |                         | 125,213 |   |      |   | 52,177  |  |      | 95,307  |      |   | 171,537 |  |   | 184,765 |  
|                                                                  |  |                         |         |   |     
|Add- fixed charges:                                               |  |                         |         |   |      |   |         |  |      |         |      |   |         |  |   |         |  
|Interest on long term debt                                        |  |                         | 75,327  |   |      |   | 85,777  |  |      | 100,855 |      |   | 93,118  |  |   | 71,720  |  
|Amortization of net debt premium, discount, and expenses          |  |                         | 1,059   |   |      |   | 1,377   |  |      | 1,495   |      |   | 1,497   |  |   | 1,345   |  
|                                                                  |  |                         |         |   |      |   |         |  |      |         |      |   |         |  |   |         |  
|Total fixed charges                                               |  |                         | 76,386  |   |      |   | 87,154  |  |      | 102,350 |      |   | 94,615  |  |   | 73,065  |  
|                                                                  |  |                         |         |   |      |   |         |  |      |         |      |   |         |  |   |         |  
|Earnings available for fixed charges                              |  |                         | 201,599 |   |      |   | 139,331 |  |      | 197,657 |      |   | 266,152 |  |   | 257,830 |  
|                                                                  |  |                         |         |   |      |   |         |  |      |         |      |   |         |  |   |         |  
|Ratio of earnings to fixed charges                                |  |                         | 2.63    |   |      |   | 1.59    |  |      | 1.93    |      |   | 2.81    |  |   | 3.52    |  
|                                                                  |  |                         |         |   |      |   |         |  |      |         |      |   |         |  |   |         |