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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>UNITED STATES</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>SECURITIES AND EXCHANGE COMMISSION</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="text-transform: uppercase"><B>Washington,
DC 20549</B></FONT></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>FORM 8-K</B></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d)<BR>
OF THE SECURITIES EXCHANGE ACT OF 1934</B></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&#9;Date of Report (Date of earliest event
reported):&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U><B>May 15, 2012</B></U></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; border-bottom: Black 1pt solid"><B>ThermoEnergy
Corporation </B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(Exact name of registrant as specified in
its charter)</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; border-bottom: Black 1pt solid"><B>Delaware</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(State or other jurisdiction of incorporation)</P>

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<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 55%; padding-right: 5.4pt; padding-left: 5.4pt; font-weight: bold; text-align: center; border-bottom: Black 1pt solid">33-46104-FW</TD>
    <TD STYLE="width: 45%; padding-right: 5.4pt; padding-left: 5.4pt; font-weight: bold; text-align: center; border-bottom: Black 1pt solid">71-0659511</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; text-align: center">(Commission File Number)</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; text-align: center">(IRS Employer Identification No.)</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; text-align: justify">&nbsp;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; text-align: justify">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font-weight: bold; text-align: center; border-bottom: Black 1pt solid">10 New Bond Street, Worcester, Massachusetts</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font-weight: bold; text-align: center; border-bottom: Black 1pt solid">01606</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; text-align: center">(Address of principal executive offices)</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; text-align: center">(Zip Code)</TD></TR>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; text-align: center; margin-bottom: 0pt; border-bottom: Black 1pt solid"><B>(508) 854-1628</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(Registrant&rsquo;s telephone number, including
area code)</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">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 (<I>see </I>General Instruction A.2. below):</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Wingdings">&#168;</FONT>&nbsp;Written
communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Wingdings">&#168;</FONT>&nbsp;Soliciting
material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Wingdings">&#168;</FONT>&nbsp;Pre-commencement
communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Wingdings">&#168;</FONT>&nbsp;Pre-commencement
communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Item 5.02.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Departure of Directors or Principal Officers;
Election of Directors; Appointment of Principal Officers; Compensatory Arrangements of Certain Officers</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">On May 15, 2012, Joseph P. Bartlett was elected as a
director to fill the vacancy on our Board of Directors created by the death of David Anthony to complete a term expiring on
the date of our 2012 Annual Meeting of Stockholders. Mr. Bartlett will serve as a member of the Audit Committee of our Board
of Directors. In connection with his election to our Board of Directors, Mr. Bartlett was also elected as a director of our
subsidiary, CASTion Corporation.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Mr. Bartlett was designated for election to our Board of
Directors by The Quercus Trust under  to a Voting Agreement, dated as of November 19, 2009, among <FONT STYLE="color: black">The
Quercus Trust; Focus Fund L.P.; Empire Capital Partners, LP and certain of its affiliates; and Robert S. Trump </FONT>(collectively,
the &ldquo;Investors&rdquo;) pursuant to which the Investors agreed to vote all of their shares of our Series B Convertible
Preferred Stock (which, as a class, is entitled to elect four members of our Board of Directors) for the election as
directors of three persons designated by The Quercus Trust and of one person designated by Mr. Trump.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Pursuant to our 2008 Incentive Stock Plan, Mr. Bartlett, as
a non-employee director, was automatically granted an option to purchase 30,000 shares of our Common Stock at an exercise price
of $0.15 per share (the closing price of our Common Stock in the over-the-counter market on May 14, 2012, the date immediately
preceding his election). This option vests and becomes exercisable on the date of our 2012 Annual Meeting of Stockholders (assuming
Mr. Bartlett continues to serve as a director through such date) and has a term of ten years.</P>



<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Mr. Bartlett is counsel to The Quercus Trust and has practiced
corporate and securities law since 1985. From September 2004 until August 2008 he was a partner at Greenberg Glusker LLP in Los
Angeles, California, and from September 2000 until September 2004 he was a partner at Spolin Silverman Cohen and Bartlett LLP.
Mr. Bartlett graduated, magna cum laude, from the University of California, Hastings College of Law in 1985, and received an AB
in English literature from the University of California at Berkeley in 1980. Mr. Bartlett is 54 years old. He brings to our Board
of Directors expertise in corporate finance, corporate governance and the oversight of smaller reporting companies. Mr. Bartlett
previously served as a member of our Board of Directors, from October 15, 2009 until December 28, 2009.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 3pt"><I>&nbsp;</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>SIGNATURES</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Pursuant to the requirements of the Securities Exchange Act
of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Date: May 21, 2012</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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<TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: left"><U>THERMOENERGY CORPORATION</U></TD></TR>
<TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: left">(Registrant)</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD COLSPAN="2">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD COLSPAN="2">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top; width: 47%">&nbsp;</TD>
    <TD STYLE="width: 7%">By:&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 46%">/s/ Teodor Klowan Jr.</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD>Name:<BR>Title:</TD>
    <TD STYLE="vertical-align: top; border-top: #000000 1px solid">Teodor Klowan, Jr. CPA<BR>Executive Vice President and Chief Financial Officer</TD></TR>
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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington,
DC 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):
May 15, 2012
ThermoEnergy
Corporation
(Exact name of registrant as specified in
its charter)
Delaware
(State or other jurisdiction of incorporation)
33-46104-FW
71-0659511
(Commission File Number)
(IRS Employer Identification No.)
10 New Bond Street, Worcester, Massachusetts
01606
(Address of principal executive offices)
(Zip Code)
(508) 854-1628
(Registrant's telephone number, including
area code)
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 (
see
General Instruction A.2. below):
¨
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 5.02.            Departure of Directors or Principal Officers;
Election of Directors; Appointment of Principal Officers; Compensatory Arrangements of Certain Officers
On May 15, 2012, Joseph P. Bartlett was elected as a
director to fill the vacancy on our Board of Directors created by the death of David Anthony to complete a term expiring on
the date of our 2012 Annual Meeting of Stockholders. Mr. Bartlett will serve as a member of the Audit Committee of our Board
of Directors. In connection with his election to our Board of Directors, Mr. Bartlett was also elected as a director of our
subsidiary, CASTion Corporation.
Mr. Bartlett was designated for election to our Board of
Directors by The Quercus Trust under  to a Voting Agreement, dated as of November 19, 2009, among
The
Quercus Trust; Focus Fund L.P.; Empire Capital Partners, LP and certain of its affiliates; and Robert S. Trump
(collectively,
the "Investors") pursuant to which the Investors agreed to vote all of their shares of our Series B Convertible
Preferred Stock (which, as a class, is entitled to elect four members of our Board of Directors) for the election as
directors of three persons designated by The Quercus Trust and of one person designated by Mr. Trump.
Pursuant to our 2008 Incentive Stock Plan, Mr. Bartlett, as
a non-employee director, was automatically granted an option to purchase 30,000 shares of our Common Stock at an exercise price
of $0.15 per share (the closing price of our Common Stock in the over-the-counter market on May 14, 2012, the date immediately
preceding his election). This option vests and becomes exercisable on the date of our 2012 Annual Meeting of Stockholders (assuming
Mr. Bartlett continues to serve as a director through such date) and has a term of ten years.
Mr. Bartlett is counsel to The Quercus Trust and has practiced
corporate and securities law since 1985. From September 2004 until August 2008 he was a partner at Greenberg Glusker LLP in Los
Angeles, California, and from September 2000 until September 2004 he was a partner at Spolin Silverman Cohen and Bartlett LLP.
Mr. Bartlett graduated, magna cum laude, from the University of California, Hastings College of Law in 1985, and received an AB
in English literature from the University of California at Berkeley in 1980. Mr. Bartlett is 54 years old. He brings to our Board
of Directors expertise in corporate finance, corporate governance and the oversight of smaller reporting companies. Mr. Bartlett
previously served as a member of our Board of Directors, from October 15, 2009 until December 28, 2009.
SIGNATURES
Pursuant to the requirements of the Securities Exchange Act
of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
Date: May 21, 2012
THERMOENERGY CORPORATION
(Registrant)
By:
/s/ Teodor Klowan Jr.
Name:
Title:
Teodor Klowan, Jr. CPA
Executive Vice President and Chief Financial Officer