##### 



Nicor Gas Company
Form 10-K
Exhibit 24.01

POWER OF ATTORNEY

The undersigned, a Director, Officer, or Director and Officer of Nicor Inc. and
Northern Illinois Gas Company (doing business as Nicor Gas Company), Illinois
corporations, hereby authorizes any executive officer of Nicor Inc. and each of
them, to execute in the name and on behalf of the undersigned as such Director,
Officer, or Director and Officer, the 2002 Annual Report on Form 10-K of Nicor
Inc. and Nicor Gas Company (and any amendments thereto) to be filed pursuant to
the Securities Exchange Act of 1934.

|                                                  
|--------------------------------------------------
|Date: March 20, 2003                              
|                                                  
|/s/ ROBERT M. BEAVERS, JR.

Robert M. Beavers, Jr.





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##### 



POWER OF ATTORNEY

The undersigned, a Director, Officer, or Director and Officer of Nicor Inc. and
Northern Illinois Gas Company (doing business as Nicor Gas Company), Illinois
corporations, hereby authorizes any executive officer of Nicor Inc. and each of
them, to execute in the name and on behalf of the undersigned as such Director,
Officer, or Director and Officer, the 2002 Annual Report on Form 10-K of Nicor
Inc. and Nicor Gas Company (and any amendments thereto) to be filed pursuant to
the Securities Exchange Act of 1934.

|                                      
|--------------------------------------
|Date: March 20, 2003                  
|                                      
|/s/ BRUCE P. BICKNER

Bruce P. Bickner





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##### 



POWER OF ATTORNEY

The undersigned, a Director, Officer, or Director and Officer of Nicor Inc. and
Northern Illinois Gas Company (doing business as Nicor Gas Company), Illinois
corporations, hereby authorizes any executive officer of Nicor Inc. and each of
them, to execute in the name and on behalf of the undersigned as such Director,
Officer, or Director and Officer, the 2002 Annual Report on Form 10-K of Nicor
Inc. and Nicor Gas Company (and any amendments thereto) to be filed pursuant to
the Securities Exchange Act of 1934.

|                                                
|------------------------------------------------
|Date: March 20, 2003                            
|                                                
|/s/ JOHN H. BIRDSALL, III

John H. Birdsall, III





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##### 



POWER OF ATTORNEY

The undersigned, a Director, Officer, or Director and Officer of Nicor Inc. and
Northern Illinois Gas Company (doing business as Nicor Gas Company), Illinois
corporations, hereby authorizes any executive officer of Nicor Inc. and each of
them, to execute in the name and on behalf of the undersigned as such Director,
Officer, or Director and Officer, the 2002 Annual Report on Form 10-K of Nicor
Inc. and Nicor Gas Company (and any amendments thereto) to be filed pursuant to
the Securities Exchange Act of 1934.

|                                        
|----------------------------------------
|Date: March 20, 2003                    
|                                        
|/s/ THOMAS A. DONAHOE

Thomas A. Donahoe





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##### 



POWER OF ATTORNEY

The undersigned, a Director, Officer, or Director and Officer of Nicor Inc. and
Northern Illinois Gas Company (doing business as Nicor Gas Company), Illinois
corporations, hereby authorizes any executive officer of Nicor Inc. and each of
them, to execute in the name and on behalf of the undersigned as such Director,
Officer, or Director and Officer, the 2002 Annual Report on Form 10-K of Nicor
Inc. and Nicor Gas Company (and any amendments thereto) to be filed pursuant to
the Securities Exchange Act of 1934.

|                                      
|--------------------------------------
|Date: March 20, 2003                  
|                                      
|/s/ THOMAS L. FISHER

Thomas L. Fisher





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##### 



POWER OF ATTORNEY

The undersigned, a Director, Officer, or Director and Officer of Nicor Inc. and
Northern Illinois Gas Company (doing business as Nicor Gas Company), Illinois
corporations, hereby authorizes any executive officer of Nicor Inc. and each of
them, to execute in the name and on behalf of the undersigned as such Director,
Officer, or Director and Officer, the 2002 Annual Report on Form 10-K of Nicor
Inc. and Nicor Gas Company (and any amendments thereto) to be filed pursuant to
the Securities Exchange Act of 1934.

|                                             
|---------------------------------------------
|Date: March 20, 2003                         
|                                             
|/s/ KATHLEEN L. HALLORAN
Kathleen L. Halloran





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##### 



POWER OF ATTORNEY

The undersigned, a Director, Officer, or Director and Officer of Nicor Inc. and
Northern Illinois Gas Company (doing business as Nicor Gas Company), Illinois
corporations, hereby authorizes any executive officer of Nicor Inc. and each of
them, to execute in the name and on behalf of the undersigned as such Director,
Officer, or Director and Officer, the 2002 Annual Report on Form 10-K of Nicor
Inc. and Nicor Gas Company (and any amendments thereto) to be filed pursuant to
the Securities Exchange Act of 1934.

|                                
|--------------------------------
|Date: March 20, 2003            
|                                
|/s/ JOHN E. JONES

John E. Jones





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##### 



POWER OF ATTORNEY

The undersigned, a Director, Officer, or Director and Officer of Nicor Inc. and
Northern Illinois Gas Company (doing business as Nicor Gas Company), Illinois
corporations, hereby authorizes any executive officer of Nicor Inc. and each of
them, to execute in the name and on behalf of the undersigned as such Director,
Officer, or Director and Officer, the 2002 Annual Report on Form 10-K of Nicor
Inc. and Nicor Gas Company (and any amendments thereto) to be filed pursuant to
the Securities Exchange Act of 1934.

|                                      
|--------------------------------------
|Date: March 20, 2003                  
|                                      
|/s/ DENNIS J. KELLER

Dennis J. Keller





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##### 



POWER OF ATTORNEY

The undersigned, a Director, Officer, or Director and Officer of Nicor Inc. and
Northern Illinois Gas Company (doing business as Nicor Gas Company), Illinois
corporations, hereby authorizes any executive officer of Nicor Inc. and each of
them, to execute in the name and on behalf of the undersigned as such Director,
Officer, or Director and Officer, the 2002 Annual Report on Form 10-K of Nicor
Inc. and Nicor Gas Company (and any amendments thereto) to be filed pursuant to
the Securities Exchange Act of 1934.

|                                        
|----------------------------------------
|Date: March 20, 2003                    
|                                        
|/s/ WILLIAM A. OSBORN

William A. Osborn





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##### 



POWER OF ATTORNEY

The undersigned, a Director, Officer, or Director and Officer of Nicor Inc. and
Northern Illinois Gas Company (doing business as Nicor Gas Company), Illinois
corporations, hereby authorizes any executive officer of Nicor Inc. and each of
them, to execute in the name and on behalf of the undersigned as such Director,
Officer, or Director and Officer, the 2002 Annual Report on Form 10-K of Nicor
Inc. and Nicor Gas Company (and any amendments thereto) to be filed pursuant to
the Securities Exchange Act of 1934.

|                      
|----------------------
|Date: March 20, 2003  
|                      
|/s/ JOHN RAU

John Rau





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##### 



POWER OF ATTORNEY

The undersigned, a Director, Officer, or Director and Officer of Nicor Inc. and
Northern Illinois Gas Company (doing business as Nicor Gas Company), Illinois
corporations, hereby authorizes any executive officer of Nicor Inc. and each of
them, to execute in the name and on behalf of the undersigned as such Director,
Officer, or Director and Officer, the 2002 Annual Report on Form 10-K of Nicor
Inc. and Nicor Gas Company (and any amendments thereto) to be filed pursuant to
the Securities Exchange Act of 1934.

|                                    
|------------------------------------
|Date: March 20, 2003                
|                                    
|/s/ JOHN F. RIORDAN

John F. Riordan





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##### 



POWER OF ATTORNEY

The undersigned, a Director, Officer, or Director and Officer of Nicor Inc. and
Northern Illinois Gas Company (doing business as Nicor Gas Company), Illinois
corporations, hereby authorizes any executive officer of Nicor Inc. and each of
them, to execute in the name and on behalf of the undersigned as such Director,
Officer, or Director and Officer, the 2002 Annual Report on Form 10-K of Nicor
Inc. and Nicor Gas Company (and any amendments thereto) to be filed pursuant to
the Securities Exchange Act of 1934.

|                                      
|--------------------------------------
|Date: March 20, 2003                  
|                                      
|/s/ PATRICIA A. WIER

Patricia A. Wier