Registration Withdrawl


September 12, 2008


Division of Corporation Finance

United States Securities and Exchange Commission

100 F Street, N.E.

Washington, D.C. 20549


  Re: ADA-ES, Inc.
       Application for Withdrawal
       Registration Statement on Form S-3
       SEC File No. 333-119795

Ladies and Gentlemen:

ADA-ES, Inc. (“we” or the “Company”) hereby requests that the Form RW, “Application for Withdrawal” of the above-captioned Registration Statement on Form S-3, which was filed on August 29, 2008, be itself withdrawn. The Application was filed in error.

Please do not hesitate to contact me if you have any questions.


ADA-ES, Inc.
/s/ Mark H McKinnies
Mark H. McKinnies
Senior Vice President & Chief Financial Officer