| |  | Nicor Gas Company Form 10-K/A Exhibit 12.01
| |  | -------------------------------------------



Nicor
Gas Company

Computation of Consolidated Ratio of Earnings to Fixed Charges (As Restated (1))

(thousands)



|                                                                                    |  | Year ended December 31 |        
|----------------------------------------------------------------------------------- |  | ---------------------- | -------
|                                                                                    |  | 2001                   |        
|Earnings available to cover fixed charges:                                          |  |                        |        
|                                                                                   
|Net income                                                                          |  | $                      | 98,806 
|                                                                                   
|Add: Income taxes                                                                   |  |                        | 57,000 
|                                                                                   
|Fixed charges                                                                       |  |                        | 45,431 
|                                                                                   
|Allowance for funds used during construction                                        |  |                        | (241   
|                                                                                    |  |                        |        
|                                                                                    |  | $                      | 200,996
|                                                                                    |  |                        |        
|Fixed charges:                                                                      |  |                        |        
|                                                                                   
|Interest on debt                                                                    |  | $                      | 43,542 
|                                                                                   
|Other interest charges and amortization of debt discount, premium, and expense,
net |  |                        | 1,889  
|                                                                                    |  |                        |        
|                                                                                    |  | $                      | 45,431 
|                                                                                    |  |                        |        
|Ratio of earnings to fixed charges                                                  |  |                        | 4.42   
|                                                                                    |  |                        |        



|(1) |  | See Notes to the Consolidated Financial Statements  Reclassifications and  Restatement beginning on page 25.
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