Exhibit 12.7

Illinois Power Company

Computation of Ratios of Earnings to Fixed Charges and Combined

Fixed Charges and Preferred Stock Dividend Requirements

(Thousands of Dollars, Except Ratios)



|                                                                                      |  |                         |         |      |   |         |  |      |         |  |      |         |     |  |   |         |    
|------------------------------------------------------------------------------------- |  | ----------------------- | ------- | ---- | - | ------- |  | ---- | ------- |  | ---- | ------- | --- |  | - | ------- | ---
|                                                                                      |  | Year Ended December 31, |        
|                                                                                      |  | 2004(1)                 |         | 2005 |   | 2006    |  | 2007 |         |  | 2008 |        
|Net income from continuing operations                                                 |  | $                       | 137,538 |      | $ | 97,039  |  | $    | 56,659  |  | $    | 25,780  |     |  | $ | 4,970   |    
|Add- Taxes based on income                                                            |  |                         | 87,591  |      |   | 65,171  |  |      | 37,246  |  |      | 15,341  |     |  |   | 4,746   |    
|                                                                                      |  |                         |         |      |   |         |  |      |         |  |      |         |     |  |   |         |    
|Net income before income taxes                                                        |  |                         | 225,129 |      |   | 162,210 |  |      | 93,905  |  |      | 41,121  |     |  |   | 9,716   |    
|Add- fixed charges:                                                                   |  |                         |         |      |   |         |  |      |         |  |      |         |     |  |   |         |    
|Interest on long term debt                                                            |  |                         | 112,616 |      |   | 41,028  |  |      | 46,167  |  |      | 69,085  | (2) |  |   | 91,143  | (2)
|Estimated interest cost within rental expense                                         |  |                         | 1,696   |      |   | 1,290   |  |      | 205     |  |      | 234     |     |  |   | 701     |    
|Amortization of net debt premium, discount, expenses and losses                       |  |                         | 18,772  |      |   | 2,315   |  |      | 3,537   |  |      | 8,454   |     |  |   | 8,922   |    
|                                                                                      |  |                         |         |      |   |         |  |      |         |  |      |         |     |  |   |         |    
|Total fixed charges                                                                   |  |                         | 133,084 |      |   | 44,633  |  |      | 49,909  |  |      | 77,773  |     |  |   | 100,766 |    
|                                                                                      |  |                         |         |      |   |         |  |      |         |  |      |         |     |  |   |         |    
|Earnings available for fixed charges                                                  |  |                         | 358,213 |      |   | 206,843 |  |      | 143,814 |  |      | 118,894 |     |  |   | 110,482 |    
|                                                                                      |  |                         |         |      |   |         |  |      |         |  |      |         |     |  |   |         |    
|Ratio of earnings to fixed charges                                                    |  |                         | 2.69    |      |   | 4.63    |  |      | 2.88    |  |      | 1.52    |     |  |   | 1.09    |    
|                                                                                      |  |                         |         |      |   |         |  |      |         |  |      |         |     |  |   |         |    
|Earnings required for combined fixed charges and preferred stock dividends:           |  |                         |         |      |   |         |  |      |         |  |      |         |     |  |   |         |    
|Preferred stock dividends                                                             |  |                         | 2,294   |      |   | 2,294   |  |      | 2,294   |  |      | 2,294   |     |  |   | 2,294   |    
|Adjustment to pre-tax basis                                                           |  |                         | 1,461   |      |   | 1,542   |  |      | 1,508   |  |      | 1,365   |     |  |   | 2,191   |    
|                                                                                      |  |                         |         |      |   |         |  |      |         |  |      |         |     |  |   |         |    
|                                                                                      |  |                         | 3,755   |      |   | 3,836   |  |      | 3,802   |  |      | 3,659   |     |  |   | 4,485   |    
|                                                                                      |  |                         |         |      |   |         |  |      |         |  |      |         |     |  |   |         |    
|Combined fixed charges and preferred stock dividend requirements                      |  | $                       | 136,839 |      | $ | 48,469  |  | $    | 53,711  |  | $    | 81,432  |     |  | $ | 105,251 |    
|                                                                                      |  |                         |         |      |   |         |  |      |         |  |      |         |     |  |   |         |    
|Ratio of earnings to combined fixed charges and preferred stock dividend requirements |  |                         | 2.61    |      |   | 4.26    |  |      | 2.67    |  |      | 1.46    |     |  |   | 1.04    |    
|                                                                                      |  |                         |         |      |   |         |  |      |         |  |      |         |     |  |   |         |    

(1)Ameren Corporation purchased Illinois Power Company on September 30, 2004, amounts include combined predecessor and successor financial
information.

(2)Includes FIN 48 interest expense