Exhibit 12.5

CILCORP INC.

Computation of Ratio of Earnings to Fixed Charges

(Thousands of Dollars, Except Ratios)



|                                                                  |  |                        |         |                         |   |                          |  |                        |        |  |      |        |  |   |        |   |  |   |        |  
|----------------------------------------------------------------- |  | ---------------------- | ------- | ----------------------- | - | ------------------------ |  | ---------------------- | ------ |  | ---- | ------ |  | - | ------ | - |  | - | ------ | -
|                                                                  |  | Year EndedDecember 31, |         | 1/01/03 Thru 1/30/03(1) |   | 1/31/03 Thru 12/31/03(1) |  | Year EndedDecember 31, |       
|                                                                  |  | 2001                   |         | 2002                    |   |                          |  | 2004                   |        |  | 2005 |       
|Net income from continuing operations                             |  | $                      | 25,428  |                         | $ | 24,658                   |  | $                      | 9,203  |  | $    | 14,400 |  | $ | 10,367 |   |  | $ | 3,222  |  
|Less- Change in accounting principle                              |  |                        | -       |                         |   | -                        |  |                        | 3,818  |  |      | -      |  |   | -      |   |  |   | (2,497 | )
|Add- Taxes based on income (benefit)                              |  |                        | 22,182  |                         |   | 6,841                    |  |                        | 2,922  |  |      | 5,946  |  |   | (8,526 | ) |  |   | (3,164 | )
|                                                                  |  |                        |         |                         |   |                          |  |                        |        |  |      |        |  |   |        |   |  |   |        |  
|Net income before income taxes and change in accounting principle |  |                        | 47,610  |                         |   | 31,499                   |  |                        | 8,307  |  |      | 20,346 |  |   | 1,841  |   |  |   | 2,555  |  
|                                                                  |  |                        |         |                         |   |                         
|Add- fixed charges:                                               |  |                        |         |                         |   |                          |  |                        |        |  |      |        |  |   |        |   |  |   |        |  
|Interest on long term debt                                        |  |                        | 74,710  |                         |   | 71,407                   |  |                        | 5,035  |  |      | 48,899 |  |   | 51,992 |   |  |   | 50,562 |  
|Estimated interest cost within rental expense                     |  |                        | 979     |                         |   | 1,619                    |  |                        | 87     |  |      | 1,398  |  |   | 395    |   |  |   | 390    |  
|Amortization of net debt premium, discount, and expenses          |  |                        | -       |                         |   | -                        |  |                        | 168    |  |      | 862    |  |   | 767    |   |  |   | 693    |  
|Subsidiary preferred stock dividends                              |  |                        | 2,159   |                         |   | 2,159                    |  |                        | 180    |  |      | 1,947  |  |   | 2,062  |   |  |   | 1,988  |  
|Adjust preferred stock dividends to pre-tax basis                 |  |                        | 1,420   |                         |   | 1,420                    |  |                        | 103    |  |      | 1,114  |  |   | 346    |   |  |   | 1,293  |  
|                                                                  |  |                        |         |                         |   |                          |  |                        |        |  |      |        |  |   |        |   |  |   |        |  
|Total fixed charges                                               |  |                        | 79,268  |                         |   | 76,605                   |  |                        | 5,573  |  |      | 54,220 |  |   | 55,562 |   |  |   | 54,926 |  
|                                                                  |  |                        |         |                         |   |                          |  |                        |        |  |      |        |  |   |        |   |  |   |        |  
|Less: Adjustment of preferred stock dividends to pre-tax basis    |  |                        | 1,420   |                         |   | 1,420                    |  |                        | 103    |  |      | 1,114  |  |   | 346    |   |  |   | 1,293  |  
|                                                                  |  |                        |         |                         |   |                          |  |                        |        |  |      |        |  |   |        |   |  |   |        |  
|Earnings available for fixed charges                              |  |                        | 125,458 |                         |   | 106,684                  |  |                        | 13,777 |  |      | 73,452 |  |   | 57,057 |   |  |   | 56,188 |  
|                                                                  |  |                        |         |                         |   |                          |  |                        |        |  |      |        |  |   |        |   |  |   |        |  
|Ratio of earnings to fixed charges                                |  |                        | 1.58    |                         |   | 1.39                     |  |                        | 2.47   |  |      | 1.35   |  |   | 1.02   |   |  |   | 1.02   |  
|                                                                  |  |                        |         |                         |   |                          |  |                        |        |  |      |        |  |   |        |   |  |   |        |  



|(1) | Ameren Corporation purchased CILCORP Inc. and subsidiaries on January 31, 2003.
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