September 12, 2008

VIA EDGAR

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. 333-131085

Ladies and Gentlemen:

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Application”) of the above-captioned Registration Statement on Form S-3, which was filed on August 29, 2008, be itself withdrawn.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

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