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<TEXT>
                         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

</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99
<SEQUENCE>2
<FILENAME>ada8k-ex991.txt
<TEXT>
April 10, 2006


Dear Fellow Shareholders:

We are very pleased to report that our 2005 developments and financial
results demonstrate that we are succeeding on our paramount objective
to be a leader in the supply of mercury control technology for the
nation's 1,100 coal-fired boilers.  Currently, the market is being
fueled by new plants, several state regulations and consent decrees, as
well as evaluations in anticipation of Federal legislation.  EPA
recently estimated this to become a $3-10 billion market once federal
regulations are passed.  This market continues to be the cornerstone of
the Company's growth.  In fact, sales in the mercury control segment of
the business grew 48% in 2005, stemming from three areas: 1) commercial
sales of activated carbon injection (ACI) systems, 2) mercury
measurement services and demonstrations, and 3) field activities in
Department of Energy and industry-supported programs.  Furthermore, due
to ADA-ES' operating leverage, operating income grew at more than twice
the rate of revenues during the year.  Below we have highlighted key
achievements of 2005, and our plans for achieving continued success.

First Commercial Contracts Signal the Start of the Mercury Control
Market

During 2005, the commercial mercury control market began in earnest and
we signed our first contracts for two systems, through which we are
supplying ACI equipment valued at approximately $1 million each. We
also provided engineering, design and ancillary equipment on a third
system.  Two of these systems were designed, fabricated, and shipped in
2005, with the other to be delivered in 2006.  Additionally, in
partnership with NORIT Americas, we are now offering proven mercury
sorbents to these customers through long-term supply contracts.  The
sorbents will be used to capture mercury from flue gas in the new
systems. On an average sized plant, sorbent sales are expected to be
approximately $1-2 million per year for each plant. We expect to begin
to realize revenues from the commissions for sales of these sorbents
once some of the systems are operational, likely in the third quarter
of 2006.

So far in 2006, we have signed contracts for six more commercial
systems.  We anticipate that these systems will be delivered and
installed during 2006 and 2007.  Based upon current contract
negotiations, we also expect orders on a number of additional systems
to be awarded during the balance of 2006.  We expect that the contracts
for commercial mercury control systems will result in 35% growth in
total revenues this year.

Continued Funding of R&D for Mercury Control Technology from Government
and Industry-Supported Contracts

In 2005, we worked on four DOE and industry-supported demonstrations
and several private utility funded demonstrations to develop and
demonstrate our mercury emission control technology.  These programs
have financed our growth, helped us establish our market position, and
provided us a mechanism to be profitable during the pre-market period.
To date, we have participated in 22 full-scale demonstrations at
different plants across the country.  These programs represent a broad
spectrum of equipment configurations and coal characteristics with
several more scheduled to take place through 2007.  In fact, in January
2006 we were awarded two additional contracts from the DOE that we
expect to result in an additional $7.5 million in revenue over the next
two to three years.  All of these programs should provide a total
revenue base of $4-6 million per year for the next three years.

Additionally, these programs have been valuable to the Company in other
ways including: 1) providing experience working hand in hand with our
eventual customers developing and testing the technology, 2) enhancing
our intellectual property portfolio based on technology improvements,
3) creating opportunities to train and hire new engineers, and 4)
enabling the development of performance data on a wide range of coals
that allows us to sell commercial systems with guaranteed mercury
removal rates.

Completed Private Placement

In October 2005, we completed a private placement to supplement cash
flow generated from operations.  With the proceeds from this recent
private placement, we now have over $20 million of capital available
that will afford us a great deal of flexibility to enhance growth and
capture further value throughout the various segments of the growing
commercial mercury control market.

2005 Growth and Continued Profitability

With regard to our financial results, we achieved gains in revenue,
operating income and net income for the year ended December 31, 2005.
Total revenues increased 31% to $11.0 million, operating income grew
70% to $651,000 and net income rose 97% to $663,000 or $0.13 per
diluted share, calculated on 23% more shares outstanding due to the
October 2005 private equity placement.

Outlook

2005 was a successful year in terms of growth and development for ADA-
ES, and we anticipate that the Company will continue to flourish in
2006.  We plan to build upon our previous successes and use our strong
financial position to continue to capitalize on the significant
opportunities in the emerging mercury control market.  Two areas in
particular that we are exploring: 1) taking a more active role in
carbon supply to vertically integrate our business, and 2) investing in
all aspects of the design and manufacturing of the ACI equipment, which
is currently designed by us and NORIT, but fabricated by others.  To
provide the Company with additional expertise, we have nominated two
new members to the Board of Directors who have extensive experience in
mergers and acquisitions and the operation of industrial facilities
worldwide.

The growth we achieved in 2005 was driven by the tremendous interest
and excitement we are seeing in the mercury control market.  As we
transition from technology development and demonstration activities
into commercial sales, we continue to expand and develop the Company's
capabilities, intellectual property, and resources to meet the growing
demand.  Based on the market growth we anticipate, as well as the new
sources of revenue we are pursing, we are optimistic about the
Company's near and long-term business prospects.

On behalf of the Board of Directors, management and employees, we thank
you for your support and confidence in ADA-ES and look forward to
updating you on the Company's continued development.

Sincerely,

/s/ Michael D. Durham

Michael Durham, Ph.D., MBA
President

</TEXT>
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