                         U.S. Securities and Exchange Commission
                                Washington, D.C. 20549

                                    FORM 8-K

                                CURRENT REPORT
      PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

   Date of Report (Date of earliest event reported):  April 10, 2006


                               ADA-ES, INC.
              ----------------------------------------------------
             (Exact name of registrant as specified in its charter)


          Colorado                 000-50216               84-1457385
----------------------------      -----------          -----------------
(State or other jurisdiction     (Commission          (I.R.S. Employer
       of incorporation)          File Number)        Identification No.)


               8100 SouthPark Way, B, Littleton, Colorado           80120
               ------------------------------------------          --------
                 (Address of principal executive offices)         (Zip Code)

Registrant's telephone number, including area code: (303)734-1727


                               Not Applicable
                              ----------------
         (Former name or former address, if changed since last  report)

Check the appropriate box below if the Form 8-K filing is intended to
simultaneously satisfy the filing obligation of the registrant under any of the
following provisions:

/_/  Written communications pursuant to Rule 425 under the Securities Act (17
     CFR 230.425)

/_/  Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
      240.14a-12)

/_/  Pre-commencement communications pursuant to Rule 14d-2(b) under the
      Exchange Act (17 CFR 240.14d-2(b))

/_/  Pre-commencement communications pursuant to Rule 13e-4(c) under the
      Exchange Act (17 CFR 240.13e-4(c))


Item 8.01 Other Events

A letter to the shareholders accompanied the Registrant's proxy materials for
the 2006 Annual Meeting to be held on May 10, 2006.  A copy of that letter is
being filed as an exhibit hereto.

Item 9.01. Financial Statements and Exhibits

(d)
The following items are furnished as exhibits to this report:

99.1   Letter to the Shareholders dated April 10, 2006 from Michael D. Durham,
President included with proxy materials.

SIGNATURES

     Pursuant to the requirements of the Securities Exchange Act of
1934, the Registrant duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.

                                                    ADA-ES, Inc.
                                                      Registrant

Date:  April 28, 2006                          /s/ Mark H. McKinnies
                                              ----------------------
                                                 Mark H. McKinnies
                                             Chief Financial Officer

INDEX TO EXHIBITS




Exhibit No.                 Description
-----------               -----------------

99.1             Letter to Shareholders dated April 10, 2006

