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 1, 2009

ADA-ES, INC.

(Name of registrant as specified in its charter)

Colorado |  | 000-50216 |  | 84-1457385
(State or other jurisdiction of incorporation) |  | (Commission File Number) |  | (I.R.S. Employer Identification Number)

8100 SouthPark Way, Unit 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 7.01 | Regulation FD Disclosure.

On April 1, 2009 ADA-ES will present at the Knight Clean Coal Conference in Boston, MA. A copy of the presentation materials is attached hereto as an exhibit 99.1.

Item 9.01. | Financial Statements and Exhibits

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

99.1 | Knight Clean Coal Conference presentation.

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.

Date: April 1, 2009

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

INDEX TO EXHIBITS

Exhibit No. |  | Description
99.1 |  | Knight Clean Coal Conference presentation.