                                                                    EXHIBIT 23.1





            CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM



We consent to the incorporation by reference of our report dated February 13,
2006 accompanying the financial statements of ADA-ES, Inc., which report appears
in the December 31, 2005 Annual Report on Form 10-KSB of ADA-ES, Inc., also
incorporated by reference in this Form S-3 Registration Statement of ADA-ES,
Inc., and to the use of our name and the statements with respect to us, as
appearing under the heading "Experts" in the Registration Statement.



/s/ HEIN & ASSOCIATES LLP
-------------------------
HEIN & ASSOCIATES LLP

Denver, Colorado
April 19, 2006

