Exhibit 10.21

                       Amendment to Coal Supply Agreement


     This Amendment is entered into effective January 1, 2004,  between Southern
Indiana Gas and Electric Company (Buyer) and Vectren Fuels,  Inc., f/k/a SIGCORP
Fuels, Inc. (Seller) and evidences as follows:

     WHEREAS,  on January 19, 2000,  Buyer and Seller entered into a Coal Supply
Agreement  whereby Seller sells coal produced by the  Prosperity  Mine to Buyer;
and

     WHEREAS, the parties intend to continue this arrangement under the terms of
the Coal Supply Agreement, as amended hereby; and

     WHEREAS, in accordance with a 1999 Letter Agreement, Buyer has reviewed the
terms hereof with the OUCC;

     NOW, THEREFORE, the Buyer and Seller agree as follows:

     1. The parties have renewed the Agreement  for an  additional  two (2) year
period,  ending  December  31,  2005.  Buyer  reserves  its right to extend  the
Agreement  through  December  31,  2008,  subject to the  parties'  agreement on
pricing for that additional term.

     2. The  parties  agree that  Section 6.1 of the Coal  Supply  Agreement  is
superceded and replaced with the following provision:

          6.1  Price.  The Base Price of fuel per  million  BTU's  delivered  to
     Buyer's Generating Stations during the term of the Agreement is as follows:

                             2004 $1.2010 per MMBtu

                             2005 $1.2615 per MMBtu

     3. All other  terms and  conditions  of the Coal  Supply  Agreement  remain
unmodified and will apply throughout the term of the Agreement.

     In  Witness  Whereof,  Buyer  and  Seller  have  agreed  to these  terms as
evidenced by the signatures of their authorized representatives set forth below:

VECTREN FUELS, INC.                   SOUTHERN INDIANA GAS AND ELECTRIC COMPANY



By:  /s/ Randy L. Beck                By: /s/ Ronald G. Jochum
   -----------------------------         ---------------------------------------
     Randy L. Beck                        Ronald G. Jochum