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 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 2006 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:
      January 24, 2007

















/s/
      ROBERT M. BEAVERS, JR.


Robert
      M.
      Beavers, Jr.





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 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 2006 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:
      January 24, 2007

















/s/
      BRUCE P. BICKNER


Bruce
      P.
      Bickner





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 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 2006 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:
      January 24, 2007

















/s/
      JOHN H. BIRDSALL, III


John
      H.
      Birdsall, III





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 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 2006 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:
      January 24, 2007

















/s/
      THOMAS A. DONAHOE


Thomas
      A.
      Donahoe





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 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 2006 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:
      January 24, 2007

















/s/
      RAYMOND A. JEAN


Raymond
      A. Jean





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 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 2006 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:
      January 24, 2007

















/s/
      BRENDA J. GAINES


Brenda
      J.
      Gaines





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 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 2006 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:
      January 24, 2007

















/s/
      DENNIS J. KELLER


Dennis
      J.
      Keller





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 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 2006 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:
      January 24, 2007

















/s/
      R.
      EDEN MARTIN


R.
      Eden
      Martin





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 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 2006 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:
      January 24, 2007

















/s/
      GEORGIA R. NELSON


Georgia
      R. Nelson








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 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 2006 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:
      January 24, 2007

















/s/
      JOHN RAU


John
      Rau








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 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 2006 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:
      January 24, 2007

















/s/
      JOHN F. RIORDAN


John
      F.
      Riordan