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<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>
<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV align="right" style="font-size: 10pt; margin-top: 1pt">As filed with the Securities and Exchange Commission on October&nbsp;1, 2007<BR>
Registration No.&nbsp;333-144110
</DIV>


<DIV style="width: 100%; border-bottom: 2pt solid black; font-size: 1pt">&nbsp;</DIV>
<DIV style="width: 100%; border-bottom: 1pt solid black; font-size: 1pt">&nbsp;</DIV>




<DIV align="center" style="font-size: 14pt; margin-top: 12pt"><B>UNITED STATES SECURITIES AND EXCHANGE COMMISSION</B>
</DIV>

<DIV align="center" style="font-size: 12pt"><B>Washington, D.C. 20549<BR>
<DIV align="center"><DIV style="font-size: 3pt; margin-top: 16pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV></DIV></B>
</DIV>

<DIV align="center" style="font-size: 18pt; margin-top: 12pt"><B>FORM S-8</B>
</DIV>


<DIV align="center" style="font-size: 12pt; margin-top: 12pt"><B>REGISTRATION STATEMENT<BR>
<I>Under</I><BR>
<I>The Securities Act of 1933</I></B>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 6pt"><B><DIV align="center"><DIV style="font-size: 3pt; margin-top: 16pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV></DIV></B>
</DIV>

<DIV align="center" style="font-size: 24pt; margin-top: 12pt"><B>Renegy Holdings, Inc.</B>
</DIV>

<DIV align="center" style="font-size: 10pt"><B>(Exact name of Registrant as specified in its charter)</B></DIV>


<DIV align="center" style="font-size: 10pt"><DIV align="center"><DIV style="font-size: 3pt; margin-top: 16pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV></DIV></DIV>


<DIV align="center">
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<TR valign="bottom">
    <TD align="center" valign="top"><B>Delaware<BR>
(State or other jurisdiction of <BR>
incorporation or organization)</B>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><B>20-8789239<BR>
(I.R.S. Employer<BR>
Identification Number)</B></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><B>301 West Warner Road, Suite&nbsp;132<BR>
Tempe, Arizona 85284<BR>
(Address, including zip code of Registrant&#146;s principal executive offices)</B></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 6pt"><DIV align="center"><DIV style="font-size: 3pt; margin-top: 16pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV></DIV></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><B>Renegy Holdings, Inc. 2007 Equity Incentive Plan<BR>
Catalytica Energy Systems, Inc. 1995 Stock Plan</B></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><B>(Full title of the plan)</B></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 6pt"><DIV align="center"><DIV style="font-size: 3pt; margin-top: 16pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV></DIV></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><B>Richard M. Weinroth, Esq.<BR>
Secretary<BR>
Renegy Holdings, Inc.<BR>
301 West Warner Road, Suite&nbsp;132<BR>
Tempe, AZ 85284<BR>
(480)&nbsp;556-5555</B></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 0pt"><B>(Name, address, including zip code, and telephone number, including area code, of agent for service)</B></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 6pt"><DIV align="center"><DIV style="font-size: 3pt; margin-top: 16pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV></DIV></DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
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    <TD width="31%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="31%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="31%">&nbsp;</TD>
</TR>
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<TR valign="bottom">
    <TD align="center" valign="top">&nbsp;
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><I>Copies to:</I></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR style="font-size: 10pt">
    <TD>&nbsp;</TD>
</TR>

<TR valign="bottom">
    <TD align="center" valign="top"><B>Donna M. Petkanics, Esq. <BR>
Bradley L. Finkelstein, Esq. <BR>
Daniel J. Rodriguez, Esq. <BR>
Wilson Sonsini Goodrich &#038; Rosati <BR>
Professional Corporation <BR>
650 Page Mill Road <BR>
Palo Alto, CA 94304<BR>
(650)&nbsp;493-9300</B>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><B>Robert M. Worsley<BR>
Chief Executive Officer<BR>
Renegy Holdings, Inc.<BR>
301 West Warner Road, Suite&nbsp;132<BR>
Tempe, AZ 85284<BR>
(480)&nbsp;556-5555</B>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><B>Christopher D. Johnson, Esq.<BR>
Christopher A. Van Tuyl, Esq.<BR>
Squire, Sanders &#038; Dempsey L.L.P.<BR>
40 N. Central Avenue, Suite&nbsp;2700<BR>
Phoenix, AZ 85004<BR>
(602)&nbsp;528-4000</B></TD>
</TR>
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</TABLE>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 6pt"><DIV align="center"><DIV style="font-size: 3pt; margin-top: 16pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV></DIV>
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt">CALCULATION OF REGISTRATION FEE</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
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    <TD width="1%">&nbsp;</TD>
    <TD width="37%">&nbsp;</TD>
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    <TD width="2%">&nbsp;</TD>
    <TD width="11%">&nbsp;</TD>
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    <TD width="2%">&nbsp;</TD>
    <TD width="6%">&nbsp;</TD>
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    <TD width="2%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD><!-- VRule -->
    <TD width="2%">&nbsp;</TD>
    <TD width="8%">&nbsp;</TD>

    <TD width="1%">&nbsp;</TD>
</TR><TR style="font-size: 1px" valign="bottom">
    <TD nowrap align="left" colspan="15" style="border-bottom: 3px double #000000">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>Proposed</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>Proposed</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>Maximum</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>Maximum</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>Amount</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>Offering</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>Aggregate</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>Amount of</B></TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD nowrap align="center"><B>Title of Securities to</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>to be</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>Price</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>Offering</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>Registration</B></TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD nowrap align="center"><B>be Registered</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>Registered(1)</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>Per Share (2)</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>Price (2)</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>Fee (2)</B></TD>
    <TD width="1%">&nbsp;</TD>
</TR>

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    <TD width="1%" style="border-top: 2px solid #000000">&nbsp;</TD>
                    <TD style="border-top: 2px solid #000000"><DIV style="margin-left:15px; text-indent:-15px">Common Stock of the
Registrant, $0.001
par value per share,
to be issued upon the
exercise of equity
awards granted under
the Renegy Holdings,
Inc. 2007 Equity
Incentive Plan</DIV></TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="center" valign="bottom" style="border-top: 2px solid #000000">1,000,000</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="center" valign="bottom" style="border-top: 2px solid #000000">$5.11</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="center" valign="bottom" style="border-top: 2px solid #000000">$5,110,000.00</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="center" valign="bottom" style="border-top: 2px solid #000000">$156.88</TD>
    <TD width="1%" style="border-top: 2px solid #000000">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD width="1%" style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000"><DIV style="margin-left:15px; text-indent:-15px">Common Stock of the
Registrant, $0.001
par value per share,
to be issued upon the
exercise of equity
awards granted under
the Catalytica Energy
Systems, Inc. 1995
Stock Plan</DIV></TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="center" valign="bottom" style="border-top: 2px solid #000000">316,696</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="center" valign="bottom" style="border-top: 2px solid #000000">$19.18</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="center" valign="bottom" style="border-top: 2px solid #000000">$6,074,229.28</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="center" valign="bottom" style="border-top: 2px solid #000000">$186.48</TD>
    <TD width="1%" style="border-top: 2px solid #000000">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD width="1%" style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000"><DIV style="margin-left:15px; text-indent:-15px">Total</DIV></TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="center" valign="bottom" style="border-top: 2px solid #000000">1,316,696</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="center" valign="bottom" style="border-top: 2px solid #000000">&#151;</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="center" valign="bottom" style="border-top: 2px solid #000000">$11,184,229.28</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="center" valign="bottom" style="border-top: 2px solid #000000">$343.36</TD>
    <TD width="1%" style="border-top: 2px solid #000000">&nbsp;</TD>
</TR>
<TR style="font-size: 1px" valign="bottom">
    <TD nowrap align="left" colspan="15" style="border-top: 3px double #000000">&nbsp;</TD>
</TR>

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</TABLE>
</DIV>


<DIV align="left">
<DIV style="font-size: 3pt; margin-top: 0pt; width: 18%; border-top: 0px solid #000000">&nbsp;</DIV>
</DIV>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">
<TR>
    <TD width="3%"></TD>
    <TD width="1%"></TD>
    <TD width="96"></TD>
</TR>

<TR valign="top">
    <TD nowrap align="left">(1)</TD>
    <TD>&nbsp;</TD>
    <TD>Plus such indeterminable number of additional shares as may be issued as a result of an
adjustment in the shares in the event of a stock split, stock dividend or similar capital
adjustment, as required by the plans.</TD>
</TR>

<TR style="font-size: 3pt"><TD>&nbsp;</TD></TR>

<TR valign="top">
    <TD nowrap align="left">(2)</TD>
    <TD>&nbsp;</TD>
    <TD>Estimated solely for the purpose of calculating the amount of the registration fee
pursuant to Rule 457(h) under the Securities Act of 1933, as amended. The price per share and
aggregate offering price for shares of Renegy Holdings, Inc. Common Stock issuable pursuant to the
Renegy Holdings, Inc. 2007 Equity Incentive Plan are based on the book value of such securities
computed as of the latest practicable date prior to the date of filing of this registration
statement. The price per share and aggregate offering price for shares of Renegy Holdings, Inc.
Common Stock issuable pursuant to the Catalytica Energy Systems, Inc. 1995 Stock Plan are based on
the weighted average exercise price for outstanding options granted pursuant to such plan.</TD>
</TR>

</TABLE>



<DIV style="width: 100%; border-bottom: 1pt solid black; margin-top: 10pt; font-size: 1pt">&nbsp;</DIV>
<DIV style="width: 100%; border-bottom: 2pt solid black; font-size: 1pt">&nbsp;</DIV>





<P align="center" style="font-size: 10pt"><!-- Folio -->&nbsp;<!-- /Folio -->
</DIV>

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<DIV style="font-family: 'Times New Roman',Times,serif">








<!-- TOC -->
<A name="toc"><DIV align="CENTER" style="page-break-before:always"><U><B>TABLE OF CONTENTS</B></U></DIV></A>

<P><CENTER>
<TABLE border="0" width="90%" cellpadding="0" cellspacing="0">
<TR>
	<TD width="3%"></TD>
	<TD width="3%"></TD>
	<TD width="3%"></TD>
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	<TD width="3%"></TD>
	<TD width="3%"></TD>
	<TD width="76%"></TD>
</TR>
<TR><TD colspan="9"><A HREF="#000">PART I</A></TD></TR>
<TR><TD colspan="9"><A HREF="#001">PART II</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#002">Item&nbsp;3. Incorporation of Documents by Reference</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#003">Item&nbsp;4. Description of Securities</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#004">Item&nbsp;5. Interests of Named Experts and Counsel</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#005">Item&nbsp;6. Indemnification of Directors and Officers</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#006">Item&nbsp;7. Exemption from Registration Claimed</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#007">Item&nbsp;8. Exhibits</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#008">Item&nbsp;9. Undertakings</A></TD></TR>
<TR><TD colspan="9"><A HREF="#009">SIGNATURES</A></TD></TR>
<TR><TD colspan="9"><A HREF="#010">EXHIBIT INDEX</A></TD></TR>
<TR><TD colspan="9"><A HREF="p74422exv5w1.htm">EX-5.1</A></TD></TR>
<TR><TD colspan="9"><A HREF="p74422exv23w1.htm">EX-23.1</A></TD></TR>
<TR><TD colspan="9"><A HREF="p74422exv99w1.htm">EX-99.1</A></TD></TR>
<TR><TD colspan="9"><A HREF="p74422exv99w2.htm">EX-99.2</A></TD></TR>
</TABLE>
</CENTER>
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<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>




<!-- link1 "PART I" -->
<DIV align="left"><A NAME="000"></A></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>PART I</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The information called for in Part&nbsp;I of Form S-8 is not being filed with or included in this
Form S-8 (by incorporation by reference or otherwise) in accordance with the rules and regulations
of the Securities and Exchange Commission (the &#147;Commission&#148;).
</DIV>
<!-- link1 "PART II" -->
<DIV align="left"><A NAME="001"></A></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>PART II</B>
</DIV>


<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><B>INFORMATION REQUIRED IN THE REGISTRATION STATEMENT</B>

</DIV>
<!-- link2 "Item&nbsp;3. Incorporation of Documents by Reference" -->
<DIV align="left"><A NAME="002"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;3. Incorporation of Documents by Reference.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The following documents have been filed by the Registrant with the Commission and are
incorporated herein by reference:
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a)&nbsp;The Registrant&#146;s prospectus filed pursuant to Rule 424(b) of the Securities Act of 1933,
as amended (the &#147;Securities Act&#148;), filed on September&nbsp;7, 2007;
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b)&nbsp;The Registrant&#146;s Current Reports on Form 8-K filed on September&nbsp;17, 2007, September&nbsp;21,
2007 and September&nbsp;26, 2007; and
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c)&nbsp;The description of the Registrant&#146;s Common Stock contained in the Registrant&#146;s
Registration Statement on Form 8-A dated September&nbsp;28, 2007, and any further amendment or report
filed for the purpose of updating such description.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;All documents subsequently filed by the Registrant pursuant to Sections&nbsp;13(a), 13(c), 14 and
15(d) of the Securities Exchange Act of 1934 (the &#147;Exchange Act&#148;), prior to the filing of a
post-effective amendment to the registration statement which indicates that all of the shares of
Common Stock offered have been sold or which deregisters all of such shares then remaining unsold,
shall be deemed to be incorporated by reference in this registration statement and to be a part
hereof from the date of the filing of such documents.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;For purposes of this registration statement, any statement contained in a document
incorporated or deemed to be incorporated by reference herein shall be deemed to be modified or
superseded to the extent that a statement contained herein or in any other subsequently filed
document which also is or is deemed to be incorporated by reference herein modifies or supersedes
such statement. Any such statement so modified or superseded shall not be deemed, except as so
modified or superseded, to constitute a part of this registration statement.
</DIV>
<!-- link2 "Item&nbsp;4. Description of Securities" -->
<DIV align="left"><A NAME="003"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;4. Description of Securities</B>.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not applicable.
</DIV>
<!-- link2 "Item&nbsp;5. Interests of Named Experts and Counsel" -->
<DIV align="left"><A NAME="004"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;5. Interests of Named Experts and Counsel.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not applicable.
</DIV>

<P align="center" style="font-size: 10pt"><!-- Folio -->&nbsp;<!-- /Folio -->
</DIV>

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<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">
<!-- link2 "Item&nbsp;6. Indemnification of Directors and Officers" -->
<DIV align="left"><A NAME="005"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;6. Indemnification of Directors and Officers.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Section&nbsp;102(b)(7) of the Delaware General Corporation Law, or the DGCL, permits a corporation
to include in its certificate of incorporation a provision eliminating or limiting the personal
liability of a director to the corporation or its stockholders for monetary damages for breach of
fiduciary duty as a director, provided that such provision may not eliminate or limit the liability
of a director for any breach of the director&#146;s duty of loyalty to the corporation or its
stockholders, for acts or omissions that are not in good faith or that involve intentional
misconduct or a knowing violation of law, for the payment of unlawful dividends, or for any
transaction from which the director derived an improper personal benefit. The Registrant&#146;s
certificate of incorporation provides that a director will not be liable for monetary damages for
breach of fiduciary duty to the fullest extent provided by DGCL as the same exists or as may
hereafter be amended.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Section&nbsp;145(a) of the DGCL provides, in general, that a corporation shall have the power to
indemnify any person who was or is a party or is threatened to be made a party to any threatened,
pending or completed action, suit or proceeding, whether civil, criminal, administrative or
investigative (other than an action by or in the right of the corporation), because the person is
or was a director or officer of the corporation. Such indemnity may be against expenses (including
attorneys&#146; fees), judgments, fines and amounts paid in settlement actually and reasonably incurred
by the person in connection with such action, suit or proceeding, if the person acted in good faith
and in a manner the person reasonably believed to be in or not opposed to the best interests of the
corporation and if, with respect to any criminal action or proceeding, the person did not have
reasonable cause to believe the person&#146;s conduct was unlawful.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Section&nbsp;145(b) of the DGCL provides, in general, that a corporation shall have the power to
indemnify any person who was or is a party or is threatened to be made a party to any threatened,
pending or completed action or suit by or in the right of the corporation to procure a judgment in
its favor because the person is or was a director or officer of the corporation, against any
expenses (including attorneys&#146; fees) actually and reasonably incurred by the person in connection
with the defense or settlement of such action or suit if the person acted in good faith and in a
manner the person reasonably believed to be in or not opposed to the best interests of the
corporation.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Section&nbsp;145(g) of the DGCL provides, in general, that a corporation shall have the power to
purchase and maintain insurance on behalf of any person who is or was a director or officer of the
corporation against any liability asserted against the person in any such capacity, or arising out
of the person&#146;s status as such, whether or not the corporation would have the power to indemnify
the person against such liability under the provisions of the law.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The bylaws of Registrant provide in effect that, subject to certain limited exceptions, the
Registrant may indemnify its directors and officers to the extent authorized or permitted by the
DGCL. In addition, the directors and officers of the Registrant will be insured under policies of
insurance maintained by the Registrant, subject to the limits of the policies, against certain
losses arising from any claims made against them by reason of being or having been such directors
or officers. In addition, the Registrant intends to enter into contracts with certain of its
directors and officers providing for indemnification of such persons by the Registrant to the full
extent authorized or permitted by law, subject to certain limited exceptions.
</DIV>
<!-- link2 "Item&nbsp;7. Exemption from Registration Claimed" -->
<DIV align="left"><A NAME="006"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;7. Exemption from Registration Claimed.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not Applicable.
</DIV>

<!-- link2 "Item&nbsp;8. Exhibits" -->
<DIV align="left"><A NAME="007"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;8. Exhibits.</B>
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom" style="font-size: 6pt">
    <TD width="2%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD>
    <TD width="80%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:15px; text-indent:-0px">5.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Opinion of Wilson Sonsini Goodrich &#038; Rosati, Professional Corporation.</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
</TABLE>
</DIV>
<P align="center" style="font-size: 10pt"><!-- Folio -->&nbsp;<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="2%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD>
    <TD width="80%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:15px; text-indent:-0px">23.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of Ernst &#038; Young LLP, independent registered public accounting firm.</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:15px; text-indent:-0px">23.2
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of Wilson Sonsini Goodrich &#038; Rosati, Professional Corporation
(included in Exhibit&nbsp;5.1).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:15px; text-indent:-0px">24.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Power of Attorney (included on the signature page).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:15px; text-indent:-0px">99.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Renegy Holdings, Inc. 2007 Equity Incentive Plan.</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:15px; text-indent:-0px">99.2
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Catalytica Energy Systems, Inc. 1995 Stock Plan.</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>

<!-- link2 "Item&nbsp;9. Undertakings" -->
<DIV align="left"><A NAME="008"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;9. Undertakings.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a)&nbsp;The small business issuer will:
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1)&nbsp;File, during any period in which it offers or sells securities, a post-effective amendment
to this registration statement to:
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i)&nbsp;Include any prospectus required by section 10(a)(3) of the Securities Act;
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii)&nbsp;Reflect in the prospectus any facts or events which, individually or together, represent
a fundamental change in the information in the registration statement. Notwithstanding the
foregoing, any increase or decrease in volume of securities offered (if the total dollar value of
securities offered would not exceed that which was registered) and any deviation from the low or
high end of the estimated maximum offering range may be reflected in the form of prospectus filed
with the Commission pursuant to Rule 424(b) if, in the aggregate, the changes in volume and price
represent no more than a 20% change in the maximum aggregate offering price set forth in the
&#147;Calculation of Registration Fee&#148; table in the effective registration statement; and
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii)&nbsp;Include any additional or changed material information on the plan of distribution.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2)&nbsp;For determining liability under the Securities Act, treat each post-effective amendment as
a new registration statement of the securities offered, and the offering of the securities at that
time to be the initial bona fide offering.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(3)&nbsp;File a post-effective amendment to remove from registration any of the securities that
remain unsold at the end of the offering.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(4)&nbsp;For determining liability of the undersigned small business issuer under the Securities
Act to any purchaser in the initial distribution of the securities, the undersigned small business
issuer undertakes that in a primary offering of securities of the undersigned small business issuer
pursuant to this registration statement, regardless of the underwriting method used to sell the
securities to the purchaser, if the securities are offered or sold to such purchaser by means of
any of the following communications, the undersigned small business issuer will be a seller to the
purchaser and will be considered to offer or sell such securities to such purchaser:
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i)&nbsp;Any preliminary prospectus or prospectus of the undersigned small business issuer relating
to the offering required to be filed pursuant to Rule&nbsp;424;
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii) Any free writing prospectus relating to the offering prepared by or on behalf of the
undersigned small business issuer or used or referred to by the undersigned small business issuer;
</DIV>

<P align="center" style="font-size: 10pt"><!-- Folio -->&nbsp;<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii)&nbsp;The portion of any other free writing prospectus relating to the offering containing
material information about the undersigned small business issuer or its securities provided by or
on behalf of the undersigned small business issuer; and
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iv)&nbsp;Any other communication that is an offer in the offering made by the undersigned small
business issuer to the purchaser.
</DIV>

<P align="center" style="font-size: 10pt"><!-- Folio -->&nbsp;<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<!-- link1 "SIGNATURES" -->
<DIV align="left"><A NAME="009"></A></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>SIGNATURES</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, as amended, the Registrant
certifies that it has reasonable grounds to believe that it meets all of the requirements for
filing on Form S-8 and has duly caused this registration statement to be signed on its behalf by
the undersigned, thereunto duly authorized, in the City of Tempe, State of Arizona on October&nbsp;1,
2007.
</DIV>

<TABLE width="100%" border="0" cellspacing="0" cellpadding="0" style="font-size: 10pt">
<TR>
    <TD width="48%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="35%">&nbsp;</TD>
    <TD width="15%">&nbsp;</TD>
</TR>
<TR>
    <TD valign="top" align="left">&nbsp;</TD>
    <TD colspan="3" align="left">RENEGY HOLDINGS, INC.<BR>
&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD valign="top">By:&nbsp;&nbsp;</TD>
    <TD colspan="2" style="border-bottom: 1px solid #000000" align="left">/s/ Robert W. Zack
&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="2" align="left">Robert W. Zack&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="2" align="left">Chief Financial Officer&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR>
    <TD colspan="5">&nbsp;</TD>
</TR>
</TABLE>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>POWER OF ATTORNEY</B>
</DIV>



<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below constitutes
and appoints Robert M. Worsley and Robert W. Zack, and each of them, his or her attorneys-in fact,
each with the power of substitution, for him or her in any and all capacities, to sign any and all
amendments to this registration statement (including post-effective statements), and to sign any
registration statement for the same offering covered by this registration statement that is to be
effective upon filing pursuant to Rule 462(b) promulgated under the Securities Act of 1933, as
amended, and all post-effective amendments thereto, and to file the same, with exhibits thereto and
other documents in connection therewith, with the Securities and Exchange Commission, granting unto
said attorneys-in-fact and agents, and each of them, full power and authority to do and perform
each and every act and thing requisite and necessary to be done in and about the premises, as fully
to all intents and purposes as he or she might or could do in person, hereby ratifying and
confirming all that such attorneys-in-fact, or his or her or their substitute or substitutes, may
lawfully do or cause to be done by virtue hereof. This Power of Attorney may be signed in several
counterparts.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, as amended, this registration
statement has been signed by the following persons in the capacities indicated.
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="30%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="30%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="30%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="center" style="border-bottom: 1px solid #000000"><B>Signature</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000"><B>Title</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000"><B>Date</B></TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom"><!-- Blank Space -->
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top">/s/ Robert M. Worsley<BR>
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Robert M. Worsley
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Chief Executive Officer<BR>
(Principal Executive Officer and Director)
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">October&nbsp;1, 2007</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top">/s/ Robert W. Zack<BR>
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Robert W. Zack
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top" nowrap>Chief Financial Officer<BR>
(Principal Financial and Accounting Officer)
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">October&nbsp;1, 2007</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top">/s/ Richard A. Abdoo<BR>
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Richard A. Abdoo
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director&nbsp;
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">October&nbsp;1, 2007</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top">/s/ William B. Ellis<BR>
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; William B. Ellis
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director&nbsp;
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">October&nbsp;1, 2007</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top">/s/ Ricardo B. Levy<BR>
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Ricardo B. Levy
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director&nbsp;
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">October&nbsp;1, 2007</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top">/s/ Susan F. Tierney<BR>
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Susan F. Tierney
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director&nbsp;
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">October&nbsp;1, 2007</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>



<P align="center" style="font-size: 10pt"><!-- Folio -->&nbsp;<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">



<!-- link1 "EXHIBIT INDEX" -->
<DIV align="left"><A NAME="010"></A></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>EXHIBIT INDEX</B>
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="4%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD>
    <TD width="80%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="left" style="border-bottom: 0px solid #000000"><B>Exhibit</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="left" style="border-bottom: 1px solid #000000"><B>Number</B></TD>
    <TD>&nbsp;</TD>

<TD nowrap align="left" style="border-bottom: 1px solid #000000"><DIV style="margin-left:200px; text-indent:-0px"><B>Document
Description</B></DIV></TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="center"><DIV style="margin-left:0px; text-indent:-0px">5.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Opinion of Wilson Sonsini Goodrich &#038; Rosati, Professional Corporation.</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="center"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="center"><DIV style="margin-left:0px; text-indent:-0px">23.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of Ernst &#038; Young LLP, independent registered public accounting firm.</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="center"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="center"><DIV style="margin-left:0px; text-indent:-0px">23.2
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of Wilson Sonsini Goodrich &#038; Rosati, Professional Corporation
(included in Exhibit&nbsp;5.1).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="center"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="center"><DIV style="margin-left:0px; text-indent:-0px">24.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Power of Attorney (included on the signature page).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="center"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="center"><DIV style="margin-left:0px; text-indent:-0px">99.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Renegy Holdings, Inc. 2007 Equity Incentive Plan.</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="center"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="center"><DIV style="margin-left:0px; text-indent:-0px">99.2
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Catalytica Energy Systems, Inc. 1995 Stock Plan.</TD>
</TR>
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sv8
Table of Contents
As filed with the Securities and Exchange Commission on October 1, 2007
Registration No. 333-144110
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM S-8
REGISTRATION STATEMENT
Under
The Securities Act of 1933
Renegy Holdings, Inc.
(Exact name of Registrant as specified in its charter)
Delaware
(State or other jurisdiction of
incorporation or organization)
20-8789239
(I.R.S. Employer
Identification Number)
301 West Warner Road, Suite 132
Tempe, Arizona 85284
(Address, including zip code of Registrant's principal executive offices)
Renegy Holdings, Inc. 2007 Equity Incentive Plan
Catalytica Energy Systems, Inc. 1995 Stock Plan
(Full title of the plan)
Richard M. Weinroth, Esq.
Secretary
Renegy Holdings, Inc.
301 West Warner Road, Suite 132
Tempe, AZ 85284
(480) 556-5555
(Name, address, including zip code, and telephone number, including area code, of agent for service)
Copies to:
Donna M. Petkanics, Esq.
Bradley L. Finkelstein, Esq.
Daniel J. Rodriguez, Esq.
Wilson Sonsini Goodrich & Rosati
Professional Corporation
650 Page Mill Road
Palo Alto, CA 94304
(650) 493-9300
Robert M. Worsley
Chief Executive Officer
Renegy Holdings, Inc.
301 West Warner Road, Suite 132
Tempe, AZ 85284
(480) 556-5555
Christopher D. Johnson, Esq.
Christopher A. Van Tuyl, Esq.
Squire, Sanders & Dempsey L.L.P.
40 N. Central Avenue, Suite 2700
Phoenix, AZ 85004
(602) 528-4000
CALCULATION OF REGISTRATION FEE
Proposed
Proposed
Maximum
Maximum
Amount
Offering
Aggregate
Amount of
Title of Securities to
to be
Price
Offering
Registration
be Registered
Registered(1)
Per Share (2)
Price (2)
Fee (2)
Common Stock of the
Registrant, $0.001
par value per share,
to be issued upon the
exercise of equity
awards granted under
the Renegy Holdings,
Inc. 2007 Equity
Incentive Plan
1,000,000
$5.11
$5,110,000.00
$156.88
Common Stock of the
Registrant, $0.001
par value per share,
to be issued upon the
exercise of equity
awards granted under
the Catalytica Energy
Systems, Inc. 1995
Stock Plan
316,696
$19.18
$6,074,229.28
$186.48
Total
1,316,696
—
$11,184,229.28
$343.36
(1)
Plus such indeterminable number of additional shares as may be issued as a result of an
adjustment in the shares in the event of a stock split, stock dividend or similar capital
adjustment, as required by the plans.
(2)
Estimated solely for the purpose of calculating the amount of the registration fee
pursuant to Rule 457(h) under the Securities Act of 1933, as amended. The price per share and
aggregate offering price for shares of Renegy Holdings, Inc. Common Stock issuable pursuant to the
Renegy Holdings, Inc. 2007 Equity Incentive Plan are based on the book value of such securities
computed as of the latest practicable date prior to the date of filing of this registration
statement. The price per share and aggregate offering price for shares of Renegy Holdings, Inc.
Common Stock issuable pursuant to the Catalytica Energy Systems, Inc. 1995 Stock Plan are based on
the weighted average exercise price for outstanding options granted pursuant to such plan.
TABLE OF CONTENTS
PART I
PART II
Item 3. Incorporation of Documents by Reference
Item 4. Description of Securities
Item 5. Interests of Named Experts and Counsel
Item 6. Indemnification of Directors and Officers
Item 7. Exemption from Registration Claimed
Item 8. Exhibits
Item 9. Undertakings
SIGNATURES
EXHIBIT INDEX
EX-5.1
EX-23.1
EX-99.1
EX-99.2
Table of Contents
PART I
The information called for in Part I of Form S-8 is not being filed with or included in this
Form S-8 (by incorporation by reference or otherwise) in accordance with the rules and regulations
of the Securities and Exchange Commission (the "Commission").
PART II
INFORMATION REQUIRED IN THE REGISTRATION STATEMENT
Item 3. Incorporation of Documents by Reference.
The following documents have been filed by the Registrant with the Commission and are
incorporated herein by reference:
(a) The Registrant's prospectus filed pursuant to Rule 424(b) of the Securities Act of 1933,
as amended (the "Securities Act"), filed on September 7, 2007;
(b) The Registrant's Current Reports on Form 8-K filed on September 17, 2007, September 21,
2007 and September 26, 2007; and
(c) The description of the Registrant's Common Stock contained in the Registrant's
Registration Statement on Form 8-A dated September 28, 2007, and any further amendment or report
filed for the purpose of updating such description.
All documents subsequently filed by the Registrant pursuant to Sections 13(a), 13(c), 14 and
15(d) of the Securities Exchange Act of 1934 (the "Exchange Act"), prior to the filing of a
post-effective amendment to the registration statement which indicates that all of the shares of
Common Stock offered have been sold or which deregisters all of such shares then remaining unsold,
shall be deemed to be incorporated by reference in this registration statement and to be a part
hereof from the date of the filing of such documents.
For purposes of this registration statement, any statement contained in a document
incorporated or deemed to be incorporated by reference herein shall be deemed to be modified or
superseded to the extent that a statement contained herein or in any other subsequently filed
document which also is or is deemed to be incorporated by reference herein modifies or supersedes
such statement. Any such statement so modified or superseded shall not be deemed, except as so
modified or superseded, to constitute a part of this registration statement.
Item 4. Description of Securities
.
Not applicable.
Item 5. Interests of Named Experts and Counsel.
Not applicable.
Table of Contents
Item 6. Indemnification of Directors and Officers.
Section 102(b)(7) of the Delaware General Corporation Law, or the DGCL, permits a corporation
to include in its certificate of incorporation a provision eliminating or limiting the personal
liability of a director to the corporation or its stockholders for monetary damages for breach of
fiduciary duty as a director, provided that such provision may not eliminate or limit the liability
of a director for any breach of the director's duty of loyalty to the corporation or its
stockholders, for acts or omissions that are not in good faith or that involve intentional
misconduct or a knowing violation of law, for the payment of unlawful dividends, or for any
transaction from which the director derived an improper personal benefit. The Registrant's
certificate of incorporation provides that a director will not be liable for monetary damages for
breach of fiduciary duty to the fullest extent provided by DGCL as the same exists or as may
hereafter be amended.
Section 145(a) of the DGCL provides, in general, that a corporation shall have the power to
indemnify any person who was or is a party or is threatened to be made a party to any threatened,
pending or completed action, suit or proceeding, whether civil, criminal, administrative or
investigative (other than an action by or in the right of the corporation), because the person is
or was a director or officer of the corporation. Such indemnity may be against expenses (including
attorneys' fees), judgments, fines and amounts paid in settlement actually and reasonably incurred
by the person in connection with such action, suit or proceeding, if the person acted in good faith
and in a manner the person reasonably believed to be in or not opposed to the best interests of the
corporation and if, with respect to any criminal action or proceeding, the person did not have
reasonable cause to believe the person's conduct was unlawful.
Section 145(b) of the DGCL provides, in general, that a corporation shall have the power to
indemnify any person who was or is a party or is threatened to be made a party to any threatened,
pending or completed action or suit by or in the right of the corporation to procure a judgment in
its favor because the person is or was a director or officer of the corporation, against any
expenses (including attorneys' fees) actually and reasonably incurred by the person in connection
with the defense or settlement of such action or suit if the person acted in good faith and in a
manner the person reasonably believed to be in or not opposed to the best interests of the
corporation.
Section 145(g) of the DGCL provides, in general, that a corporation shall have the power to
purchase and maintain insurance on behalf of any person who is or was a director or officer of the
corporation against any liability asserted against the person in any such capacity, or arising out
of the person's status as such, whether or not the corporation would have the power to indemnify
the person against such liability under the provisions of the law.
The bylaws of Registrant provide in effect that, subject to certain limited exceptions, the
Registrant may indemnify its directors and officers to the extent authorized or permitted by the
DGCL. In addition, the directors and officers of the Registrant will be insured under policies of
insurance maintained by the Registrant, subject to the limits of the policies, against certain
losses arising from any claims made against them by reason of being or having been such directors
or officers. In addition, the Registrant intends to enter into contracts with certain of its
directors and officers providing for indemnification of such persons by the Registrant to the full
extent authorized or permitted by law, subject to certain limited exceptions.
Item 7. Exemption from Registration Claimed.
Not Applicable.
Item 8. Exhibits.
5.1
Opinion of Wilson Sonsini Goodrich & Rosati, Professional Corporation.
Table of Contents
23.1
Consent of Ernst & Young LLP, independent registered public accounting firm.
23.2
Consent of Wilson Sonsini Goodrich & Rosati, Professional Corporation
(included in Exhibit 5.1).
24.1
Power of Attorney (included on the signature page).
99.1
Renegy Holdings, Inc. 2007 Equity Incentive Plan.
99.2
Catalytica Energy Systems, Inc. 1995 Stock Plan.
Item 9. Undertakings.
(a) The small business issuer will:
(1) File, during any period in which it offers or sells securities, a post-effective amendment
to this registration statement to:
(i) Include any prospectus required by section 10(a)(3) of the Securities Act;
(ii) Reflect in the prospectus any facts or events which, individually or together, represent
a fundamental change in the information in the registration statement. Notwithstanding the
foregoing, any increase or decrease in volume of securities offered (if the total dollar value of
securities offered would not exceed that which was registered) and any deviation from the low or
high end of the estimated maximum offering range may be reflected in the form of prospectus filed
with the Commission pursuant to Rule 424(b) if, in the aggregate, the changes in volume and price
represent no more than a 20% change in the maximum aggregate offering price set forth in the
"Calculation of Registration Fee" table in the effective registration statement; and
(iii) Include any additional or changed material information on the plan of distribution.
(2) For determining liability under the Securities Act, treat each post-effective amendment as
a new registration statement of the securities offered, and the offering of the securities at that
time to be the initial bona fide offering.
(3) File a post-effective amendment to remove from registration any of the securities that
remain unsold at the end of the offering.
(4) For determining liability of the undersigned small business issuer under the Securities
Act to any purchaser in the initial distribution of the securities, the undersigned small business
issuer undertakes that in a primary offering of securities of the undersigned small business issuer
pursuant to this registration statement, regardless of the underwriting method used to sell the
securities to the purchaser, if the securities are offered or sold to such purchaser by means of
any of the following communications, the undersigned small business issuer will be a seller to the
purchaser and will be considered to offer or sell such securities to such purchaser:
(i) Any preliminary prospectus or prospectus of the undersigned small business issuer relating
to the offering required to be filed pursuant to Rule 424;
(ii) Any free writing prospectus relating to the offering prepared by or on behalf of the
undersigned small business issuer or used or referred to by the undersigned small business issuer;
Table of Contents
(iii) The portion of any other free writing prospectus relating to the offering containing
material information about the undersigned small business issuer or its securities provided by or
on behalf of the undersigned small business issuer; and
(iv) Any other communication that is an offer in the offering made by the undersigned small
business issuer to the purchaser.
Table of Contents
SIGNATURES
Pursuant to the requirements of the Securities Act of 1933, as amended, the Registrant
certifies that it has reasonable grounds to believe that it meets all of the requirements for
filing on Form S-8 and has duly caused this registration statement to be signed on its behalf by
the undersigned, thereunto duly authorized, in the City of Tempe, State of Arizona on October 1,
2007.
RENEGY HOLDINGS, INC.
By:
/s/ Robert W. Zack
Robert W. Zack
Chief Financial Officer
POWER OF ATTORNEY
KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below constitutes
and appoints Robert M. Worsley and Robert W. Zack, and each of them, his or her attorneys-in fact,
each with the power of substitution, for him or her in any and all capacities, to sign any and all
amendments to this registration statement (including post-effective statements), and to sign any
registration statement for the same offering covered by this registration statement that is to be
effective upon filing pursuant to Rule 462(b) promulgated under the Securities Act of 1933, as
amended, and all post-effective amendments thereto, and to file the same, with exhibits thereto and
other documents in connection therewith, with the Securities and Exchange Commission, granting unto
said attorneys-in-fact and agents, and each of them, full power and authority to do and perform
each and every act and thing requisite and necessary to be done in and about the premises, as fully
to all intents and purposes as he or she might or could do in person, hereby ratifying and
confirming all that such attorneys-in-fact, or his or her or their substitute or substitutes, may
lawfully do or cause to be done by virtue hereof. This Power of Attorney may be signed in several
counterparts.
Pursuant to the requirements of the Securities Act of 1933, as amended, this registration
statement has been signed by the following persons in the capacities indicated.
Signature
Title
Date
/s/ Robert M. Worsley
Robert M. Worsley
Chief Executive Officer
(Principal Executive Officer and Director)
October 1, 2007
/s/ Robert W. Zack
Robert W. Zack
Chief Financial Officer
(Principal Financial and Accounting Officer)
October 1, 2007
/s/ Richard A. Abdoo
Richard A. Abdoo
Director
October 1, 2007
/s/ William B. Ellis
William B. Ellis
Director
October 1, 2007
/s/ Ricardo B. Levy
Ricardo B. Levy
Director
October 1, 2007
/s/ Susan F. Tierney
Susan F. Tierney
Director
October 1, 2007
Table of Contents
EXHIBIT INDEX
Exhibit
Number
Document
Description
5.1
Opinion of Wilson Sonsini Goodrich & Rosati, Professional Corporation.
23.1
Consent of Ernst & Young LLP, independent registered public accounting firm.
23.2
Consent of Wilson Sonsini Goodrich & Rosati, Professional Corporation
(included in Exhibit 5.1).
24.1
Power of Attorney (included on the signature page).
99.1
Renegy Holdings, Inc. 2007 Equity Incentive Plan.
99.2
Catalytica Energy Systems, Inc. 1995 Stock Plan.