Document:

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EXHIBIT 4.1

REGISTRATION RIGHTS AGREEMENT

     THIS REGISTRATION RIGHTS AGREEMENT (this “Agreement”) dated as of                     , 2007, is
entered into by and between Renegy Holdings, Inc., a Delaware corporation (the “Company”),
and the Robert M. Worsley and Christi M. Worsley Revocable Trust (the “Shareholder”).

RECITALS

     WHEREAS, concurrent with the execution hereof, the Shareholder is contributing or causing to
be contributed to the Company all of the membership interests (the “Contribution”) in (i)
Renegy, LLC, an Arizona limited liability company (“Renegy, LLC”), (ii) Renegy Trucking,
LLC, an Arizona limited liability company (“Renegy Trucking”), and (iii) Snowflake White
Mountain Power, LLC, an Arizona limited liability company (together with Renegy LLC and Renegy
Trucking, “Renegy”), all pursuant to the terms and conditions of that certain Contribution
and Merger Agreement, dated May 8, 2007, by and among the Company, Catalytica Energy Systems, Inc.,
a Delaware corporation (“CESI”), Snowflake Acquisition Corporation, a Delaware corporation, Renegy,
the Shareholder, Robert M. Worsley (“Worsley”) and Christi M. Worsley (the
“Contribution Agreement”);

     WHEREAS, pursuant to that certain Assumption Agreement, dated as of the date hereof, by and
among the Company and the parties to the Contribution Agreement (the “Assumption
Agreement”), the Company has agreed to (i) assume and perform the post-Closing (as defined in
the Contribution Agreement) rights and obligations of the Company that are set forth in the
Contribution Agreement and (ii) assume all of the rights and executory obligations of CESI under
that certain Amended and Restated Employment Agreement dated as of March 23, 2007, by and between
CESI and Robert W. Zack.

     WHEREAS, as part of the consideration for the Contribution, the Shareholder will receive
shares of common stock, par value $0.001 per share, of the Company (“Common Stock”) (the
“Contribution Shares”);

     WHEREAS, as part of the consideration for the Contribution, the Shareholder will receive
warrants (“Warrants”) to purchase, subject to certain conditions set forth therein, shares
of Common Stock (the “Warrant Shares”); and

     WHEREAS, in accordance with the terms of the Contribution Agreement and the Assumption
Agreement, the Company has agreed to grant to the Shareholder certain registration rights with
respect to the Contribution Shares and the Warrant Shares.

     NOW, THEREFORE, in consideration of the mutual promises and covenants contained in this
Agreement, the parties hereto agree as follows:

 

AGREEMENT

          1. Definitions.

               (a) As used in this Agreement, the following defined terms shall have the following meanings:

          “Affiliate” of any specified person means any other person which, directly or
indirectly, is in control of, is controlled by, or is under common control with such specified
person. For purposes of this definition, control of a person means the power, direct or indirect,
to direct or cause the direction of the management and policies of such person whether by contract
or otherwise; and the terms “controlling” and “controlled” have meanings correlative to the
foregoing.

          “Business Day” means any day other than Saturday, Sunday or any other day which is a
legal holiday under the laws of the state of New York or a day on which national banking
associations in New York are required by law or other governmental action to close.

          “Commission” means the United States Securities and Exchange Commission, or any other
federal agency at the time administering the Exchange Act or the Securities Act, whichever is the
relevant statute for the particular purpose.

          “Common Stock” shall have the meaning set forth in the preamble hereto.

          “Contribution Agreement” shall have the meaning set forth in the preamble hereto.

          “Contribution Shares” shall have the meaning set forth in the preamble hereto.

          “Delay Conditions” means (i) the Company is in possession of material non-public
information the disclosure of which would have a material adverse effect on the business,
operations, prospects, condition (financial or otherwise) of the Company and its subsidiaries,
taken as a whole or (ii) the Board of Directors of the Company determines in good faith that a
delay in the effectiveness of the Registration Statement, or the Registration Statement ceasing to
be effective or a Prospectus thereunder ceasing to be usable, as the case may be, is appropriate
due to the occurrence or existence of any material pending corporate development with respect to
the Company or due to circumstances which would result in the effectiveness of the Registration
Statement otherwise materially and adversely affecting the Company or its business. The Delay
Conditions shall be deemed to no longer exist if (x) in the case of clause (i) above, the Company
is no longer in possession of such material non-public information or the Board of Directors of the
Company determines in good faith that the disclosure of such material information would not be
prejudicial to or contrary to the interest of the Company and (y) in the case of clause (ii)
above, the Board of Directors of the Company determines in good faith that such delay or cessation
is no longer appropriate.

          “Effectiveness Period” has the meaning assigned thereto in Section 2(c)(i)
hereof.

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          “Effective Time” means the date on which the Commission declares the Registration
Statement effective or on which the Registration Statement otherwise becomes effective.

          “Electing Holder” has the meaning assigned thereto in Section 3(a)(ii) hereof.

          “Exchange Act” means the Securities Exchange Act of 1934, as amended.

          “Indemnified Person” has the meaning assigned thereto in Section 5(a) hereof.

          “Managing Underwriters” means the investment banker or investment bankers and manager
or managers that shall administer an underwritten offering, if any, conducted pursuant to
Section 6 hereof.

          “Maximum Delay Period” means 60 consecutive days in any calendar year (or 120 days in
the aggregate in any calendar year).

          “Notice and Questionnaire” means a Notice of Registration Statement and Selling
Stockholder Questionnaire, substantially in the form attached hereto as Exhibit A.

          “Other Holders” has the meaning assigned thereto in Section 6(a) hereof.

          “Person” means an individual, partnership, corporation, trust or unincorporated
organization, or a government or agency or political subdivision thereof.

          “Plan of Distribution” has the meaning assigned thereto in Section 2(a)
hereof.

          “Prospectus” means the prospectus (including, without limitation, any preliminary
prospectus, any final prospectus and any prospectus that discloses information previously omitted
from a prospectus filed as part of an effective Registration Statement in reliance upon Rule 430A
under the Securities Act) included in the Registration Statement, as amended or supplemented by any
prospectus supplement with respect to the terms of the offering of any portion of the Registrable
Securities covered by the Registration Statement and by all other amendments and supplements to
such prospectus, including all material incorporated by reference in such prospectus and all
documents filed after the date of such prospectus by the Company under the Exchange Act and
incorporated by reference therein.

          “Registration Statement” means a registration statement of the Company filed under the
Securities Act covering the Registrable Securities, including the Prospectus contained therein, any
amendments and supplements to such registration statement, including post-effective amendments, and
all exhibits and all material incorporated by reference in such registration statement, including,
without limitation, a “shelf” registration statement providing for the registration of, and the
sale on a continuous or delayed basis by the holders of, all of the Registrable Securities pursuant
to Rule 415 under the Securities Act and/or any similar rule that may be adopted by the Commission,
filed by the Company pursuant to the provisions of Section 2 of this Agreement.

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          “Registrable Security(ies)” means the Contribution Shares, the Warrant Shares, any
shares of Common Stock issued to the Shareholder pursuant to Article XI of the Contribution
Agreement and any other shares of Common Stock issued as (or issuable upon the conversion or
exercise of any warrant, right or other security which is issued as) a dividend or other
distribution with respect to, or in exchange for or in replacement of, the Contribution Shares, the
Warrant Shares or any such shares issued pursuant to Article XI of the Contribution Agreement;
provided, however, that a security ceases to be a Registrable Security when it is
no longer a Restricted Security.

          “Restricted Security” means any security except any such security that (A) has been
registered pursuant to an effective Registration Statement under the Securities Act and sold in a
manner contemplated by the Registration Statement, (B) has been sold in compliance with Rule 144
under the Securities Act (or any successor provision thereto) or is transferable pursuant to
paragraph (k) of such Rule 144 (or any successor provision thereto) or, when taken together with
all other Restricted Securities held by such person, may be sold pursuant to Rule 144 in a single
90 day period (without giving any effect to clauses (ii) and (iii) of Rule 144(e)(1)), or (C) has
otherwise been sold and a new security not subject to transfer restrictions under the Securities
Act has been delivered by or on behalf of the Company.

          “Rules and Regulations” means the published rules and regulations of the Commission
promulgated under the Securities Act or the Exchange Act, as in effect at any relevant time.

          “Securities Act” means the Securities Act of 1933, as amended.

          “Underwriter” means any underwriter of Registrable Securities in connection with an
offering thereof under a Registration Statement.

          “Warrants” shall have the meaning set forth in the preamble hereto.

          “Warrant Shares” shall have the meaning set forth in the preamble hereto.

          2. Mandatory Registration.

               (a) At any time from and after two hundred seventy (270) days after the Closing Date (as
defined in the Contribution Agreement) and for so long as the Shareholder or his permitted
assignee(s) hereunder own beneficially or of record any Registrable Securities or Warrants which
have not expired by their terms, the Company shall, upon the written request (hereinafter a
“notice”) of a holder or holders of a majority of the then outstanding Registrable Securities, and
subject to the covenants, terms and conditions of Section 2(b) below, prepare and file a
Registration Statement on Form S-3 under the Securities Act, pursuant to Rule 415 under the
Securities Act, covering the resale from time to time, of all of the shares of Registrable
Securities such holder or holders shall request and the Company shall use commercially reasonable
efforts to have the Registration Statement declared effective as soon as practicable thereafter;
provided, that the Company may, by notice to the requesting holder or holders, as the case
may be, delay such requested registrations for the Maximum Delay Period if and for so long as the
Delay Conditions exist. The Registration Statement shall contain the “Plan of
Distribution” in substantially the form attached hereto as Exhibit B.

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     The Company shall not be obligated pursuant to this Section 2 to effectuate more than
one (1) registration in any twelve (12) month period for the benefit of the holders of Registrable
Securities. In the event that Form S-3 is not available for the registration of the resale of
Registrable Securities hereunder, the Company shall register the resale of the Registrable
Securities on another such other available form of Registration Statement reasonably acceptable to
the requesting holder or holders. Notwithstanding anything to the contrary contained herein, no
request may be made under this Section 2:

               (i) within one hundred eighty (180) days after the effective date of a
Registration Statement filed by the Company covering a primary underwritten public
offering of securities of the Company under the Securities Act with an aggregate
offering price (before underwriting commissions and expenses) of at least Ten
Million Dollars ($10,000,000); provided that such offering was made in accordance
with Section 6(a) below, or

               (ii) during the period starting with the date sixty (60) days prior to the
Company’s estimated date of filing of, and ending on the date one hundred (180) days
immediately following the effective date of any Registration Statement pertaining to
securities of the Company (other than a registration of securities in a Rule 145
transaction or with respect to an employee benefit plan), provided that the Company
is actively employing in good faith commercially reasonable efforts to cause such
Registration Statement to become effective and that the Company’s estimate of the
date of filing such Registration Statement is made in good faith.

               (b) Immediately following receipt of any notice pursuant to Section 2(a), the Company
shall promptly notify all holders of Registrable Securities and Warrants from whom such notice has
not been received and, as soon thereafter as practicable, and subject to any Delay Conditions,
shall file a Registration Statement with the Commission and use commercially reasonable efforts to
have such Registration Statement declared effective under the Securities Act as soon as
practicable, so as to permit the public sale in accordance with the method of disposition specified
in such notice from requesting holders (such method of disposition shall be as requested by such
holder or holders of a majority of Registrable Securities included in such notices received by the
Company) of the number of shares of Registrable Securities specified in such notice (and in all
notices received by the Company from other holders within twenty (20) days after the giving of such
notice by the Company). If such method of disposition shall be an underwritten public offering,
subject to the covenants, terms and conditions of Section 6 below, the Company shall
designate the managing underwriter of such offering, following consultation and subject to the
approval of the holders of Registrable Securities from whom notice has been received, which
approval shall not be unreasonably withheld, conditioned or delayed. All holders of Registrable
Securities and/or Warrants providing notice to the Company pursuant to the foregoing, must
participate in such underwriting. The Company’s registration obligation hereunder shall be deemed
satisfied only when a Registration Statement(s) covering all shares of Registrable Securities
specified in notices received as aforesaid, for sale in accordance with the method of disposition
specified by the requesting holders, shall have become effective and, if such method of disposition
is a firm commitment underwritten public offering, all such shares shall have been sold pursuant
thereto.

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               (c) The Company shall use commercially reasonable efforts:

               (i) to keep the Registration Statement continuously effective in order to
permit the Prospectus to be usable by holders for resales of Registrable Securities
until the earlier of (A) the sale under the Registration Statement of all the
Registrable Securities registered thereunder and (B) all of the securities ceasing
to be Restricted Securities (such period being referred to herein as the
“Effectiveness Period”); and

               (ii) after the Effective Time and during the Effectiveness Period, promptly
upon the request of any holder of Registrable Securities and/or Warrants that is not
then an Electing Holder, to take any action reasonably necessary to enable such
holder to use the Prospectus for resales of Registrable Securities, including
without limitation any action necessary to identify such holder as a selling
stockholder in the Registration Statement; provided, however, that
nothing in this subparagraph shall relieve such holder of the obligation to return a
completed and signed Notice and Questionnaire to the Company in accordance with
Section 3(a) hereof.

     3. Registration Procedures. In connection with the Registration Statement, the
following provisions shall apply:

               (a) No holder shall be entitled to be named as a selling stockholder in the Registration
Statement as of the Effective Time, and no such holder shall be entitled to use the Prospectus for
resales of Registrable Securities at any time unless such holder has returned a completed and
signed Notice and Questionnaire to the Company by the deadline for response set forth therein;
provided, however, such holders shall have at least ten (10) Business Days from the
date on which the Notice and Questionnaire is first mailed to such holders to return a completed
and signed Notice and Questionnaire to the Company.

               (i) After the Effective Time, the Company shall, upon the request of any holder
of Registrable Securities or Warrants that is not then an Electing Holder, promptly
send a Notice and Questionnaire to such holder. The Company shall not be required
to take any action to name such holder as a selling stockholder in the Registration
Statement or to enable such holder to use the Prospectus for resales of Registrable
Securities until such holder has returned a completed and signed Notice and
Questionnaire to the Company.

               (ii) The term “Electing Holder” shall mean any holder of Registrable
Securities and/or Warrants that has returned a completed and signed Notice and
Questionnaire to the Company in accordance with Section 3(a) hereof.

               (b) The Company shall furnish to each Electing Holder, counsel to the Electing Holders
selected in accordance with Section 4(b) hereof, and the Managing Underwriters, if any, no
fewer than five (5) Business Days prior to the initial filing of the Registration Statement, a copy
of such Registration Statement, and shall furnish to such holders, counsel to such holders, and the
Managing Underwriters, if any, no fewer than two (2) Business

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Days prior to the filing of any amendment or supplement to the Prospectus, a copy of such
amendment or supplement and shall use commercially reasonable efforts to reflect in each such
document when so filed with the Commission such comments as such holders and their such counsel
reasonably may propose; provided, however, that the Company shall make the final
decision as to the form and content of each such document. If any such Registration Statement
refers to any Electing Holder by name or otherwise as the holder of any securities of the Company
and such reference is not required by the Securities Act or any similar federal statute, then such
Electing Holder shall have the right to require the deletion of the reference to such Electing
Holder in any amendment or supplement to the Registration Statement filed or prepared subsequent to
the time that such reference ceases to be required.

               (c) From the date hereof until the end of the Effectiveness Period, the Company shall (subject
to paragraph (j) below) promptly take such action as may be necessary so that (i) each of the
Registration Statement and any amendment thereto and the Prospectus and any amendment or supplement
thereto (and each report or other document incorporated by reference therein in each case) complies
in all material respects with the Securities Act and the Exchange Act and the respective Rules and
Regulations, (ii) each of the Registration Statement and any amendment thereto does not, when it
becomes effective, contain an untrue statement of a material fact or omit to state a material fact
required to be stated therein or necessary to make the statements therein, in light of the
circumstances under which they were made, not misleading and (iii) each of the Prospectus and any
amendment or supplement to the Prospectus does not at any time during the Effectiveness Period
(other than during the pendency of a Delay Condition) include an untrue statement of a material
fact or omit to state a material fact necessary in order to make the statements therein, in the
light of the circumstances under which they were made, not misleading.

               (d) The Company shall promptly advise each Electing Holder, and shall confirm such advice in
writing if so requested by any such holder (which notice pursuant to clauses (ii) through (iv)
hereof shall be accompanied by an instruction to suspend the use of the Prospectus until the
requisite changes have been made):

               (i) when the Registration Statement and any amendment thereto has been filed
with the Commission and when the Registration Statement or any post-effective
amendment thereto has become effective;

               (ii) of the issuance by the Commission or any other federal or state
governmental authority of any stop order suspending the effectiveness of the
Registration Statement or the initiation of any proceedings for such purpose;

               (iii) of the receipt by the Company of any notification with respect to the
suspension of the qualification of the securities included in the Registration
Statement for sale in any jurisdiction or the initiation of any proceeding for such
purpose; and

               (iv) if changes in the Registration Statement or the Prospectus are required in
order that the Registration Statement and Prospectus do not contain an untrue
statement of a material fact and do not omit to state a material

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fact required to be stated therein or necessary to make the statements therein
(in the case of the Prospectus, in light of the circumstances under which they were
made) not misleading.

               (e) The Company shall use commercially reasonable efforts to prevent the issuance, and if
issued to obtain the withdrawal, of any order suspending the effectiveness of the Registration
Statement at the earliest possible time.

               (f) The Company shall furnish to each requesting Electing Holder, without charge, at least one
(1) copy of the Registration Statement and all post-effective amendments thereto, including
financial statements and schedules, and, if such holder so requests in writing, all reports, other
documents and exhibits that are filed with or incorporated by reference in the Registration
Statement.

               (g) The Company shall, during the Effectiveness Period, deliver to each Electing Holder,
without charge, as many copies of the Prospectus (including each preliminary Prospectus) and any
amendment or supplement thereto as such Electing Holder may reasonably request; and the Company
consents (except during the continuance of any event described in Section 3(d)(iv) above)
to the use of the Prospectus and any amendment or supplement thereto by each of the Electing
Holders in connection with the offering and sale of the Registrable Securities covered by the
Prospectus and any amendment or supplement thereto during the Effectiveness Period.

               (h) Prior to any offering of Registrable Securities pursuant to the Registration Statement,
the Company shall (i) register or qualify or cooperate with the Electing Holders and a single
counsel for the Electing Holders in connection with the registration or qualification of such
Registrable Securities for offer and sale under the securities or “blue sky” laws of such
jurisdictions within the United States as any Electing Holder may reasonably request, (ii) keep
such registrations or qualifications in effect and comply with such laws so as to permit the
continuance of offers and sales in such jurisdictions for so long as may be necessary to enable any
Electing Holder or underwriter, if any, to complete its distribution of Registrable Securities
pursuant to the Registration Statement, and (iii) take any and all other actions necessary or
advisable to enable the disposition in such jurisdictions of such Registrable Securities;
provided, however, that in no event shall the Company be obligated to (A) qualify
as a foreign corporation or as a dealer in securities in any jurisdiction where it would not
otherwise be required to so qualify but for this Section 3(h) or (B) file any general
consent to service of process in any jurisdiction where it is not as of the date hereof so subject.

               (i) The Company shall cooperate with the Electing Holders to facilitate the timely preparation
and delivery of certificates representing Registrable Securities to be sold pursuant to the
Registration Statement, which certificates shall, upon sale to a person who is not an affiliate of
the Company pursuant to the Registration Statement, not bear any restrictive legend referring to
the Securities Act and shall meet the requirements of any securities exchange on which the
Company’s Common Stock is then listed and which certificates shall be in such permitted
denominations and registered in such names as Electing Holders may request in connection with the
sale of Registrable Securities pursuant to the Registration Statement. In order to effect the
foregoing, the Company shall use all reasonable efforts to prepare and deliver

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to the Company’s transfer agent, to the extent permitted by such transfer agent, upon
effectiveness of the Registration Statement a “blanket” legal opinion providing that, upon receipt
of certification that a sale of Registrable Securities has been made validly made to a person who
is not an affiliate of the Company pursuant to the Registration Statement, the shares may be issued
to the transferee without a restrictive legend referring to the Securities Act.

               (j) Upon the occurrence of any fact or event contemplated by paragraph 3(d)(iv) above, the
Company shall (subject to the next sentence) promptly prepare a post-effective amendment or
supplement to the Registration Statement or the Prospectus, or any document incorporated therein by
reference, or file any other required document so that, as thereafter delivered to purchasers of
the Registrable Securities included therein, the Prospectus will not include an untrue statement of
a material fact or omit to state any material fact necessary to make the statements therein, in the
light of the circumstances under which they were made, not misleading. If the Company notifies the
Electing Holders in accordance with clauses (ii) through (iv) of paragraph 3(d) above to suspend
the use of the Prospectus until the requisite changes to the Prospectus have been made, then each
Electing Holder shall suspend the use of the Prospectus until (i) such Electing Holder has received
copies of the supplemented or amended Prospectus contemplated by the preceding sentence or (ii)
such Electing Holder is advised in writing by the Company that the use of the Prospectus may be
resumed and has received copies of any additional or supplemental filings that are incorporated by
reference in the Prospectus. Notwithstanding the foregoing, but subject to Section 6
hereof, the Company may suspend the use of the Prospectus and shall not be required to amend or
supplement the Registration Statement, any related Prospectus or any document incorporated by
reference, for a period not to exceed the Maximum Delay Period if and so long as the Delay
Conditions exist.

               (k) The Company shall use commercially reasonable efforts to comply with all applicable Rules
and Regulations, and to make generally available to its stockholders as soon as practicable, but in
any event not later than eighteen months after (i) the effective date (as defined in Rule 158(c)
under the Securities Act) of the Registration Statement, (ii) the effective date of each
post-effective amendment to the Registration Statement, and (iii) the date of each filing by the
Company with the Commission of an Annual Report on Form 10-K that is incorporated by reference in
the Registration Statement, an earnings statement of the Company and its subsidiaries complying
with Section 11(a) of the Securities Act and the Rules and Regulations of the Commission thereunder
(including, at the option of the Company, Rule 158).

               (l) In the event of an underwritten offering conducted pursuant to Section 6 hereof,
the Company shall (subject to paragraph 3(j) above), if requested, promptly include or incorporate
in a Prospectus supplement or post-effective amendment to the Registration Statement such
information as the Managing Underwriters reasonably agree should be included therein and to which
the Company does not object and shall (subject to paragraph 3(j) above) make all required filings
of such Prospectus supplement or post-effective amendment as soon as practicable after it is
notified of the matters to be included or incorporated in such Prospectus supplement or
post-effective amendment.

               (m) The Company shall enter into such customary agreements (including an underwriting
agreement in customary form in the event of an underwritten offering

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conducted pursuant to Section 6 hereof) and take all other appropriate action in order
to expedite and facilitate the registration and disposition of the Registrable Securities, and in
connection therewith, if an underwriting agreement is entered into, cause the same to contain
indemnification provisions and procedures substantially identical to those set forth in Section
5 hereof.

               (n) The Company shall:

               (i) (A) make reasonably available for inspection by requesting Electing
Holders, any underwriter participating in any disposition pursuant to the
Registration Statement, and any attorney selected in accordance with Section
4(b) hereof, one accountant and any other agent retained by such holders or any
such underwriter all relevant financial and other records, pertinent corporate
documents and properties of the Company and its subsidiaries and (B) cause the
Company’s officers, directors and employees to supply all information reasonably
requested by such holders or any such underwriter, attorney, accountant or agent in
connection with the Registration Statement, in each case, as is customary for
similar due diligence examinations; provided, however, that all
records, information and documents that are designated in writing by the Company, in
good faith, as confidential shall be kept confidential by such holders and any such
underwriter, attorney, accountant or agent, unless such disclosure is made in
connection with a court proceeding or required by law, or such records, information
or documents become available to the public generally or through a third party
without an accompanying obligation of confidentiality; and provided,
further that, if the foregoing inspection and information gathering would
otherwise disrupt the Company’s conduct of its business, such inspection and
information gathering shall, to the greatest extent possible, be coordinated on
behalf of the requesting Electing Holders and the other parties entitled thereto by
one counsel designated by and on behalf of Electing Holders and other parties;

               (ii) in connection with any underwritten offering conducted pursuant to
Section 6 hereof, make such representations and warranties to the Electing
Holders participating in such underwritten offering and to the Managing
Underwriters, in form, substance and scope as are customarily made by the Company to
underwriters in secondary sale underwritten offerings of equity securities;

               (iii) in connection with any underwritten offering conducted pursuant to
Section 6 hereof, obtain opinions of counsel to the Company (which counsel
and opinions (in form, scope and substance) shall be reasonably satisfactory to the
Managing Underwriters) addressed to each requesting Electing Holder, covering such
matters as are customarily covered in opinions requested in secondary sale
underwritten offerings of equity securities (it being agreed that the matters to be
covered shall include, without limitation, as of the date of the opinion and as of
the Effective Time or the date of the most recent post-effective amendment thereto,
as the case may be, comment of such counsel as to the absence, to such counsel’s
knowledge, from the Registration Statement and the

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Prospectus, including the documents incorporated by reference therein, of an
untrue statement of a material fact or the omission of a material fact required to
be stated therein or necessary to make the statements therein (in the case of the
Prospectus, in light of the circumstances under which they were made) not
misleading);

               (iv) in connection with any underwritten offering conducted pursuant to
Section 6 hereof, obtain “comfort” letters and updates thereof from the
independent public accountants of the Company (and, if necessary, from the
independent public accountants of any subsidiary of the Company or of any business
acquired by the Company for which financial statements and financial data are, or
are required to be, included in the Registration Statement), addressed to each
requesting Electing Holder (if such Electing Holder has provided such letter,
representations or documentation, if any, required for such cold comfort letter to
be so addressed) and the underwriters, in customary form and covering matters of the
type customarily covered in “comfort” letters in connection with secondary sale
underwritten offerings;

               (v) in connection with any underwritten offering conducted pursuant to
Section 6 hereof, deliver such documents and certificates as may be
reasonably requested by any Electing Holders and the Managing Underwriters, if any,
including without limitation certificates to evidence compliance with Section
3(j) hereof and with any conditions contained in the underwriting agreement or
other agreements entered into by the Company in connection therewith.

               (o) The Company shall use commercially reasonable efforts to take all other steps necessary to
effect the registration of the Registrable Securities covered by the Registration Statement
contemplated hereby.

     4. Registration Expenses. (a) All fees and expenses incident to the performance of or
compliance with this Agreement by the Company shall be borne by it whether or not any Registration
Statement is filed or becomes effective and whether or not any securities are issued or sold
pursuant to any Registration Statement. The fees and expenses referred to in the foregoing
sentence shall include, without limitation, (i) all registration and filing fees (including without
limitation fees and expenses (A) with respect to filings required to be made with the National
Association of Securities Dealers, Inc. and (B) in compliance with securities or Blue Sky laws
(including without limitation and in addition to that provided for in (b) below, reasonable fees
and disbursements of counsel for the underwriters or counsel for the holders of Registrable
Securities in connection with Blue Sky qualifications of the Registrable Securities)), (ii)
printing expenses (including without limitation expenses of printing certificates for Registrable
Securities and of printing Prospectuses if the printing of Prospectuses is requested by the
Managing Underwriters, if any), (iii) messenger, telephone and delivery expenses, (iv) fees and
disbursements of counsel for the Company and one counsel for the holders of Registrable Securities,
in accordance with the provisions of Section 4(b) hereof, (v) fees and disbursements of all
independent certified public accountants referred to in Section 3(n)(iv) hereof (including
without limitation the expenses of any special audit and “comfort” letters required by or incident
to such performance), (vi) Securities Act liability insurance, if the Company desires such

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insurance, and (vii) fees and expenses of all other persons retained by the Company. In
addition, the Company shall pay its internal expenses (including without limitation all salaries
and expenses of its officers and employees performing legal or accounting duties), the expense of
any annual audit, and the fees and expenses incurred in connection with the listing of the
securities on a securities exchange. Notwithstanding the foregoing or anything in this Agreement
to the contrary, each holder of the Registrable Securities being registered shall pay all
underwriting fees, discounts and commissions with respect to any Registrable Securities sold by it
and the fees and disbursements of any counsel or other advisors or experts retained by such holders
(severally or jointly), other than counsel referred to in clause (iv) above.

               (b) In connection with any registration hereunder, the Company shall reimburse the holders of
the Registrable Securities being registered in such registration for the reasonable fees and
disbursements not to exceed $35,000, of not more than one counsel chosen by the holders of a
majority of the Registrable Securities for whose benefit the applicable Registration Statement is
being prepared.

     5. Indemnification and Contribution.

               (a) Indemnification by the Company.

               (i) The Company shall indemnify and hold harmless each Electing Holder and each
underwriter, selling agent or other securities professional, if any, which
facilitates the disposition of Registrable Securities, and each of their respective
officers and directors and each person who controls such Electing Holder,
underwriter, selling agent or other securities professional within the meaning of
Section 15 of the Securities Act or Section 20 of the Exchange Act (each such person
being sometimes referred to as an “Indemnified Person”) against any losses,
claims, damages or liabilities, joint or several, to which such Indemnified Person
may become subject under the Securities Act or otherwise, insofar as such losses,
claims, damages or liabilities (or actions in respect thereof) arise out of or are
based upon an untrue statement or alleged untrue statement of a material fact
contained in any Registration Statement or any Prospectus contained therein or
furnished by the Company to any Indemnified Person, or any amendment or supplement
thereto, or arise out of or are based upon the omission or alleged omission to state
therein a material fact required to be stated therein or necessary to make the
statements therein, in light of the circumstances in which they were made, not
misleading; and

               (ii) the Company hereby agrees to reimburse such Indemnified Person for any
legal or other expenses reasonably incurred by them in connection with investigating
or defending any such action or claim as such expenses are incurred;
provided, however, that the Company shall not be liable to any such
Indemnified Person in any such case to the extent that any such loss, claim, damage
or liability arises out of or is based upon an untrue statement or alleged untrue
statement or omission or alleged omission made in such Registration Statement or
Prospectus, or amendment or supplement thereto, in reliance upon and in conformity
with written information relating to such Indemnified Person

12

 

furnished to the Company by or on behalf of such Indemnified Person expressly
for use therein; provided, further, however, that the
foregoing indemnity agreement with respect to any Prospectus shall not inure to the
benefit of any Indemnified Person who failed to deliver a final Prospectus or an
amendment or supplement thereto (provided by the Company to the several Indemnified
Persons in the requisite quantity and on a timely basis to permit proper delivery on
or prior to the relevant transaction date) to the person asserting any losses,
claims, damages and liabilities and judgments caused by any untrue statement or
alleged untrue statement of a material fact contained in any Prospectus, or caused
by any omission or alleged omission to state therein a material fact required to be
stated therein or necessary to make the statements therein, in light of the
circumstances under which they were made, not misleading, if such material
misstatement or omission or alleged material misstatement or omission was cured in
the final Prospectus or an amendment or supplement thereto.

               (b) Indemnification by the Holders and any Agents and Underwriters. Each Electing
Holder agrees, as a consequence of the inclusion of any of such holder’s Registrable Securities in
any Registration Statement, and each underwriter, selling agent or other securities professional,
if any, which facilitates the disposition of Registrable Securities shall agree, as a consequence
of facilitating such disposition of Registrable Securities, severally and not jointly, to (i)
indemnify and hold harmless the Company, its directors, officers who sign such Registration
Statement and each person, if any, who controls the Company within the meaning of either Section 15
of the Securities Act or Section 20 of the Exchange Act, against any losses, claims, damages or
liabilities to which the Company or such other persons may become subject, under the Securities Act
or otherwise, insofar as such losses, claims, damages or liabilities (or actions in respect
thereof) arise out of or are based upon an untrue statement or alleged untrue statement of a
material fact contained in such Registration Statement or Prospectus, or any amendment or
supplement thereto, or arise out of or are based upon the omission or alleged omission to state
therein a material fact required to be stated therein or necessary to make the statements therein
not misleading, in each case to the extent, but only to the extent, that such untrue statement or
alleged untrue statement or omission or alleged omission was made in reliance upon and in
conformity with written information relating to such holder, underwriter, selling agent or other
securities professional furnished to the Company by or on behalf of such holder, underwriter,
selling agent or other securities professional expressly for use therein and (ii) reimburse the
Company and its directors and officers who sign such Registration Statement for any legal or other
expenses reasonably incurred by the Company and such directors and officers in connection with
investigating or defending any such action or claim as such expenses are incurred.

               (c) Notices of Claims, Etc. Promptly after receipt by an indemnified party under
subsection (a) or (b) of this Section 5 of notice of the commencement of any action, such
indemnified party shall, if a claim in respect thereof is to be made against an indemnifying party
under this Section 5, notify such indemnifying party in writing of the commencement
thereof; but the omission so to notify the indemnifying party shall not relieve it from any
liability which it may have to any indemnified party otherwise than under this Section 5.
In case any such action shall be brought against any indemnified party and it shall notify an
indemnifying party of the commencement thereof, such indemnifying party shall be entitled to
participate

13

 

therein and, to the extent that it shall wish, jointly with any other indemnifying party
similarly notified, to assume the defense thereof, with counsel satisfactory to such indemnified
party (who shall not, except with the consent of the indemnified party, be counsel to the
indemnifying party), and, after notice from the indemnifying party to such indemnified party of its
election so to assume the defense thereof, such indemnifying party shall not be liable to such
indemnified party under this Section 5 for any legal expenses of other counsel or any other
expenses, in each case subsequently incurred by such indemnified party, in connection with the
defense thereof other than reasonable costs of investigation. No indemnifying party shall, without
the written consent of the indemnified party, which consent will not be unreasonably withheld,
delayed or conditioned, effect the settlement or compromise of, or consent to the entry of any
judgment with respect to, any pending or threatened action or claim in respect of which
indemnification or contribution may be sought hereunder (whether or not the indemnified party is an
actual or potential party to such action or claim) unless such settlement, compromise or judgment
(i) includes an unconditional release of the indemnified party from all liability arising out of
such action or claim and (ii) does not include a statement as to, or an admission of, fault,
culpability or a failure to act, by or on behalf of any indemnified party.

               (d) Contribution. If the indemnification provided for in this Section 5 is
unavailable to or insufficient to hold harmless an indemnified party under subsection (a) or (b) of
this Section 5 in respect of any losses, claims, damages or liabilities (or actions in
respect thereof) referred to therein, then each indemnifying party shall contribute to the amount
paid or payable by such indemnified party as a result of such losses, claims, damages or
liabilities (or actions in respect thereof) in such proportion as is appropriate to reflect the
relative fault of the indemnifying party and the indemnified party in connection with the
statements or omissions which resulted in such losses, claims, damages or liabilities (or actions
in respect thereof), as well as any other relevant equitable considerations. The relative fault of
such indemnifying party and indemnified party shall be determined by reference to, among other
things, whether the untrue or alleged untrue statement of a material fact or omission or alleged
omission to state a material fact relates to information about such indemnifying party or
indemnified party supplied by such indemnifying party or by such indemnified party, and the
parties’ relative intent, knowledge, access to information and opportunity to correct or prevent
such statement or omission. The parties hereto agree that it would not be just and equitable if
contribution pursuant to this Section 5(d) were determined by pro rata
allocation (even if the Electing Holders or any underwriters, selling agents or other securities
professionals or all of them were treated as one entity for such purpose) or by any other method of
allocation which does not take account of the equitable considerations referred to in this
Section 5(d). The amount paid or payable by an indemnified party as a result of the
losses, claims, damages or liabilities (or actions in respect thereof) referred to above shall be
deemed to include any legal or other fees or expenses reasonably incurred by such indemnified party
in connection with investigating or defending any such action or claim. No person guilty of
fraudulent misrepresentation (within the meaning of Section 11(f) of the Securities Act) shall be
entitled to contribution from any person who was not guilty of such fraudulent misrepresentation.
The obligations of the Electing Holders and any underwriters, selling agents or other securities
professionals in this Section 5(d) to contribute shall be several in proportion to the
percentage of Registrable Securities registered or underwritten, as the case may be, by them and
not joint.

14

 

               (e) Notwithstanding any other provision of this Section 5, in no event will any
Electing Holder be required to undertake liability to any person under this Section 5 for
any amounts in excess of the dollar amount of the proceeds to be received by such holder from the
sale of such holder’s Registrable Securities (after deducting any fees, discounts and commissions
applicable thereto) pursuant to any Registration Statement.

               (f) The obligations of the Company under this Section 5 shall be in addition to any
liability that the Company may otherwise have to any Indemnified Person and the obligations of any
Indemnified Person under this Section 5 shall be in addition to any liability that such
Indemnified Person may otherwise have to the Company. The remedies provided in this Section
5 are not exclusive and shall not limit any rights or remedies that may otherwise be available
to an indemnified party at law or in equity.

          6. Underwritten Offerings.

               (a) If at any time the Company proposes to register any of its securities under the Securities
Act in connection with the public offering of such securities for its own account or for the
accounts of stockholders other than the Shareholder (“Other Holders”), solely for cash on a
form that would also permit the registration of the Registrable Securities, the Company shall, each
such time, promptly give each holder of Registrable Securities and/or Warrants written notice of
such determination. Upon the written request of any holder of Registrable Securities and/or
Warrants given within thirty (30) days after the giving of any such notice by the Company, the
Company shall use commercially reasonable efforts to cause to be registered under the Securities
Act all of the Registrable Securities that each such holder of Registrable Securities and/or
Warrants has requested be registered. In connection with any offering under this Section
6(a), the Company shall not be required to include any holder’s of Registrable Securities in
such underwriting unless such holder accepts the terms of the underwriting as agreed upon between
the Company and the Managing Underwriters, and then only in such quantity as will not, in the
reasonable opinion of the Managing Underwriters, jeopardize the success of the offering by the
Company. If the total amount of securities that all holders of Registrable Securities request to
be included in an underwritten offering exceeds the amount of securities that the Managing
Underwriters reasonably believe compatible with the success of the offering, then the number of
shares of Registrable Securities and shares of securities held by Other Holders that may be
included in the offering shall be allocated among the Shareholder and the Other Holders in such
proportion as the respective number of shares the Shareholder and each Other Holder requests to be
included in such registration bears to the total number of shares the Shareholder and Other Holders
request be included. All Registrable Securities or any other securities excluded from the
underwriting by reason of the underwriter’s marketing limitation shall not be included in such
registration. If the Shareholder or Other Holder of other securities entitled upon request to be
included in such registration, disapproves of the terms of the underwriting, such person may elect
to withdraw therefrom by written notice to the Company, the underwriter and the Other Holders of
securities to be included in such registration. The securities so withdrawn shall also be
withdrawn from registration.

               (b) Subject to the terms of this clause (b), any holder of Registrable Securities or Warrants
who desires to do so may sell Registrable Securities (in whole or in part) in an underwritten
offering. In any such underwritten offering, the underwriting arrangements

15

 

with respect thereto (including the size of the offering) will be approved by the holders of a
majority of the Registrable Securities to be included in such offering; provided,
however, that such underwriting arrangements must be reasonably satisfactory to the
Company. No holder may participate in any underwritten offering contemplated hereby unless (a)
such holder agrees to sell such holder’s Registrable Securities to be included in the underwritten
offering in accordance with any approved underwriting arrangements, (b) such holder completes and
executes all reasonable questionnaires, powers of attorney, indemnities, underwriting agreements,
lock-up letters (which shall be no more onerous than the lock-ups of the management of the Company)
and other documents required under the terms of such approved underwriting arrangements and (c) if
such holder is not then an Electing Holder, such holder returns a completed and signed Notice and
Questionnaire to the Company in accordance with Section 3(a) hereof within a reasonable
amount of time before such underwritten offering. The holders participating in any underwritten
offering shall be responsible for any underwriting fees, discounts and commissions and, subject to
Section 4 hereof, expenses of their own counsel. The Company shall pay all expenses
customarily borne by issuers, including but not limited to filing fees, the fees and disbursements
of its counsel and independent public accountants and any printing expenses incurred in connection
with such underwritten offering. Notwithstanding the foregoing or the provisions of Section
3(l) hereof, upon receipt of a request from the Managing Underwriter or a representative of
holders of a majority of the Registrable Securities to be included in an underwritten offering to
prepare and file an amendment or supplement to the Registration Statement and Prospectus in
connection with an underwritten offering, the Company may delay the filing of any such amendment or
supplement for up to the Maximum Delay Period if and so long as the Delay Conditions exist.

          7. Rule 144.

          The Company agrees, for so long as any Registrable Securities or Warrants remain outstanding
and during any period in which the Company is subject to Section 13 or 15(d) of the Exchange Act,
to use commercially reasonable efforts to (i) provide such opinions or other statements of its
legal counsel (subject to receipt of customary factual back-up certificates from the selling
stockholder and its broker) and (ii) make all filings required thereby in a timely manner in order
to permit resales of such Registrable Securities pursuant to Rule 144 of the Securities Act.

          8. Miscellaneous.

               (a) Other Registration Rights. The Company will not, on or after the date of this
Agreement, enter into any agreement with respect to its securities that is superior to the rights
granted to the holders of Registrable Securities in this Agreement or otherwise conflicts with the
provisions hereof.

               (b) Amendments and Waivers. The provisions of this Agreement may not be amended,
modified or supplemented, and waivers or consents to or departures from the provisions hereof may
not be given unless the Company has obtained the written consent of holders of a
majority-in-interest of the Registrable Securities (excluding Registrable Securities held by the
Company or its Affiliates). Notwithstanding the foregoing, a waiver or consent to departure from
the provisions hereof that relates exclusively to the rights of holders whose

16

 

Registrable Securities are being sold pursuant to a Registration Statement and that does not
affect directly or indirectly the rights of other holders of Registrable Securities may be given by
the holders of a majority of Registrable Securities being sold by such holders pursuant to such
Registration Statement.

               (c) Notices. All notices, requests, claims, demands and other communications
hereunder shall be in writing and shall be deemed to have been given if delivered to personally or
mailed by registered or certified mail, postage prepaid and return receipt requested, or by
facsimile to the address of the parties set forth on the signature pages of this Agreement. Each
of the addresses for notice on the signature pages of this Agreement may be changed by providing
appropriate notice hereunder. Notice given by personal delivery or registered mail shall be
effective upon actual receipt. Notice given by facsimile shall be effective upon actual receipt if
received during the recipient’s normal business hours, or at the beginning of the recipient’s next
normal business day after receipt if not received during the recipient’s normal business hours.
All Notices by facsimile shall be confirmed by the sender thereof promptly after transmission in
writing by registered mail or personal delivery.

          9. Parties in Interest; Administration by Special Committee. The parties to this
Agreement intend that all holders of Registrable Securities shall be entitled to receive the
benefits of this Agreement and that any Electing Holder shall be bound by the terms and provisions
of this Agreement by reason of such election with respect to the Registrable Securities that are
included in a Registration Statement. All the terms and provisions of this Agreement shall be
binding upon, shall inure to the benefit of and shall be enforceable by the respective successors
and assigns of the parties hereto; provided that Shareholder (or any permitted assignee thereof)
may only assign the rights hereunder in connection with a transfer of Registrable Securities to
Worsley, Worsley’s spouse, the ancestors or descendents of Worsley or his spouse, or any ancestor
or descendant of any such ancestors or descendants, or any trust for the benefit of any of the
foregoing persons, provided such assignee agrees to be bound by and to perform all of the terms and
provisions of this Agreement; any other assignment of rights hereunder shall be null and void.

     Prior to the End Date (as defined in the Company’s Certificate of Incorporation), the Special
Committee (as defined in the Company’s Certificate of Incorporation) of the Company shall have
exclusive authority to administer, interpret and enforce this Agreement on behalf of the Company,
and to make determinations to be made by the Company’s Board of Directors, including with respect
to Delay Conditions. For the avoidance of doubt, no such decision, interpretation or determination
made by the Special Committee in its administration of this Agreement on behalf of the Company
shall be conclusive upon Shareholder, and nothing shall prevent Shareholder from contesting any
such decision, interpretation or determination as not complying with the terms of this Agreement.

               (a) Mergers, Etc. The Company shall not, directly or indirectly, enter into any
merger, consolidation or reorganization in which the Company shall not be the surviving corporation
unless the proposed surviving corporation shall, prior to such merger, consolidation or
reorganization, agree in writing to assume the obligations of the Company under this Agreement, and
for that purpose references hereunder to “Registrable Securities” shall be deemed to be references
to the securities which the holders would be entitled to receive in

17

 

exchange for Registrable Securities under any such merger, consolidation or reorganization;
provided, however, that the provisions of this Agreement shall not apply in the event of any
merger, consolidation or reorganization in which the Company is not the surviving corporation if
the holders of Registrable Securities are entitled to receive in exchange therefor (i) cash, or
(ii) securities of the acquiring corporation which may be immediately sold to the public without
registration under the Securities Act.

               (b) Short Sales. Each Shareholder hereby agrees that it will not, at any time during
the Effectiveness Period, engage in short sales of Registrable Securities, short and deliver
Registrable Securities to close out such short positions, or enter into transactions with
broker-dealers to effect the foregoing.

               (c) Counterparts. This Agreement may be executed in any number of counterparts and by
the parties hereto in separate counterparts, each of which when so executed shall be deemed to be
an original and all of which taken together shall constitute one and the same agreement.

               (d) Headings. The headings in this agreement are for convenience of reference only
and shall not limit or otherwise affect the meaning, construction or interpretation hereof.

               (e) Governing Law. This Agreement shall be governed by and construed in accordance
with the laws of the State of Delaware without giving effect to provisions relating to conflicts of
law to the extent the application of the laws of another jurisdiction would be required thereby.

               (f) Severability. In the event that any one or more of the provisions contained
herein, or the application thereof in any circumstance, is held invalid, illegal or unenforceable
in any respect for any reason, the validity, legality and enforceability of any such provision in
every other respect and of the remaining provisions hereof shall not be in any way impaired or
affected thereby, it being intended that all of the rights and privileges of the parties hereto
shall be enforceable to the fullest extent permitted by law.

               (g) Survival. The respective indemnities, agreements, representations, warranties and
other provisions set forth in this Agreement or made pursuant hereto shall remain in full force and
effect, regardless of any investigation (or any statement as to the results thereof) made by or on
behalf of any Electing Holder, any director, officer or partner of such holder, any agent or
underwriter, any director, officer or partner of such agent or underwriter, or any controlling
person of any of the foregoing, and shall survive the transfer and registration of the Registrable
Securities of such holder.

               (h) Entire Agreement. This Agreement is intended by the parties as a final expression
of their agreement and intended to be a complete and exclusive statement of the agreement and
understanding of the parties hereto in respect of the subject matter hereof. There are no
restrictions, promises, warranties or undertakings, other than those set forth or referred to
herein, with respect to the registration rights granted with respect to the Registrable Securities.

18

 

This Agreement supersedes all prior agreements and understandings between the parties with
respect to such subject matter.

[REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

19

 

          IN WITNESS WHEREOF, the Company and the Shareholder have executed this Agreement as of the
date first written above.

	 	 	 	 	 
	 	COMPANY:

RENEGY HOLDINGS, INC.

 	 
	 	By:  	 	 
	 	 	Name:  	 	 
	 	 	Title:  	 	 
	 

	 	 	 	 	 
	 

	 	Address for Notice:
	 	 
	 
	 	 	 	 
	 

	 	Renegy Holdings, Inc.	 	 
	 

	 	To the Company’s Chief Financial Officer at
the address of the Company’s principal
office as set forth in the last filing by
the Company with the Securities and
Exchange Commission	 	 
	 
	 	 	 	 
	 

	 	Facsimile: (480) 556-5500	 	 
	 
	 	 	 	 
	 

	 	With a copy to:	 	 
	 
	 	 	 	 
	 

	 	Donna M. Petkanics, Esq.	 	 
	 

	 	Bradley L. Finkelstein, Esq.	 	 
	 

	 	Wilson Sonsini Goodrich & Rosati	 	 
	 

	 	Professional Corporation	 	 
	 

	 	650 Page Mill Road	 	 
	 

	 	Palo Alto, California 94304	 	 
	 

	 	Facsimile: (650) 493-6811	 	 

	 	 	 	 	 
	 	SHAREHOLDER:

THE ROBERT M. WORSLEY AND CHRISTI
 M. WORSLEY
REVOCABLE TRUST

 	 
	 	By:  	 	 
	 	 	Name:  	Robert M. Worsley 	 
	 	 	Title:  	Trustee 	 
	 
	 	 	 
	 	By:  	
 	 
	 	 	Name:  	Christi M. Worsley 	 
	 	 	Title:  	Trustee 	 
	 

Signature Page 1 to Registration Rights Agreement

 

 

	 	 	 	 	 
	 

	 	Address for Notice:
	 	 
	 
	 	 	 	 
	 

	 	Robert M. Worsley	 	 
	 

	 	3418 N.Val Vista Drive	 	 
	 

	 	Mesa, AZ 85213	 	 
	 

	 	Facsimile: (480) 718-7977	 	 
	 
	 	 	 	 
	 

	 	With a copy to:	 	 
	 
	 	 	 	 
	 

	 	Christopher D. Johnson, Esq.	 	 
	 

	 	Squire, Sanders & Dempsey L.L.P.	 	 
	 

	 	40 North Central Ave., Suite 2700	 	 
	 

	 	Phoenix, Arizona 85004	 	 
	 

	 	Facsimile: (602) 253-8129	 	 

Signature Page 2 to Registration Rights Agreement

 

 

Exhibit A

FORM OF NOTICE AND QUESTIONNAIRE

SELLING STOCKHOLDER NOTICE AND QUESTIONNAIRE

     The undersigned beneficial owner of common stock, par value $0.001 per share (the “Common
Stock”), of                     , a Delaware corporation (the “Company”), (the
“Registrable Securities”) understands that the Company has filed or intends to file with
the Securities and Exchange Commission (the “Commission”) a registration statement on Form
S-1 or Form S-3, as the case may be (the “Registration Statement”) for the registration and
resale under Rule 415 of the Securities Act of 1933, as amended (the “Securities Act”), of
the Registrable Securities, in accordance with the terms of the Registration Rights Agreement,
dated as of                     , 2007 (the “Registration Rights Agreement”), between the Company and
the Shareholder named therein. A copy of the Registration Rights Agreement is available from the
Company upon request at the address set forth below. All capitalized terms not otherwise defined
herein shall have the meanings ascribed thereto in the Registration Rights Agreement.

     Certain legal consequences arise from being named as a selling stockholder in the Registration
Statement and the related prospectus. Accordingly, holders and beneficial owners of Registrable
Securities are advised to consult their own securities law counsel regarding the consequences of
being named or not being named as a selling stockholder in the Registration Statement and the
related prospectus.

NOTICE

The undersigned beneficial owner (the “Selling Stockholder”) of Registrable Securities
hereby elects to include the Registrable Securities owned by it and listed below in Item 3 (unless
otherwise specified under such Item 3) in the Registration Statement.

A-1

 

The undersigned hereby provides the following information to the Company and represents and
warrants that such information is accurate:

QUESTIONNAIRE

	1.	 	Name.

	 	(a)	 	Full Legal Name of Selling Stockholder
	 
	 	 	 	 

	 
	 	(b)	 	Full Legal Name of Registered Holder (if not the same as (a) above) through
which Registrable Securities Listed in Item 3 below are held:
	 
	 	 	 	 

	 
	 	(c)	 	Full Legal Name of Natural Control Person (which means a natural person who
directly or indirectly alone or with others has power to vote or dispose of the
securities covered by the questionnaire):
	 
	 	 	 	 

	2.	 	Address for Notices to Selling Stockholder:
	 
	 	 	 

	 
	 	 	 

	 
	 	 	 

	 	 	 	 	 	 	 	 	 
	 	 	Telephone:	 	 	 	 
	 	 	 	 	 	 	 
	 

	 	Fax:	 	 	 	 	 	 
	 	 	 	 	 
	 	 	Contact Person:
 	 	 
	 	 	 	 	 	 	 	 	 

	3.	 	Beneficial Ownership of Registrable Securities:

	 	(a)	 	Type and Principal Amount of Registrable Securities beneficially owned:
	 
	 	 	 	 

	 
	 	 	 	 

	 
	 	 	 	 

A-2

 

	4.	 	Broker-Dealer Status:

	 	(a)	 	Are you a broker-dealer?

Yes o      No o

	 	(b)	 	If “yes” to Section 4(a), did you receive your Registrable Securities as
compensation for investment banking services to the Company.

Yes o      No o

	 	Note: 	 	 If no, the Commission’s staff has indicated that you should be identified as
an underwriter in the Registration Statement.
	 
	 	(c)	 	Are you an affiliate of a broker-dealer?

Yes o      No o

	 	(d)	 	If you are an affiliate of a broker-dealer, do you certify that you bought the
Registrable Securities in the ordinary course of business, and at the time of the
purchase of the Registrable Securities to be resold, you had no agreements or
understandings, directly or indirectly, with any person to distribute the Registrable
Securities?

Yes o      No o

	 	Note: 	 	 If no, the Commission’s staff has indicated that you should be identified as
an underwriter in the Registration Statement.

	5.	 	Beneficial Ownership of Other Securities of the Company Owned by the Selling Stockholder.
	 
	 	 	Except as set forth below in this Item 5, the undersigned is not the beneficial or
registered owner of any securities of the Company other than the Registrable Securities
listed above in Item 3.

	 	(a)	 	Type and Amount of Other Securities beneficially owned by the Selling
Stockholder:
	 
	 	 	 	 

	 
	 	 	 	 

A-3

 

	6.	 	Relationships with the Company:
	 
	 	 	Except as set forth below, neither the undersigned nor any of its affiliates, officers,
directors or principal equity holders (owners of 5% of more of the equity securities of the
undersigned) has held any position or office or has had any other material relationship with
the Company (or its predecessors or affiliates) during the past three years.
	 
	 	 	State any exceptions here:
	 
	 	 	 

	 
	 	 	 

     The undersigned agrees to promptly notify the Company of any inaccuracies or changes in the
information provided herein that may occur subsequent to the date hereof at any time while the
Registration Statement remains effective.

     By signing below, the undersigned consents to the disclosure of the information contained
herein in its answers to Items 1 through 6 and the inclusion of such information in the
Registration Statement and the related prospectus and any amendments or supplements thereto. The
undersigned understands that such information will be relied upon by the Company in connection with
the preparation or amendment of the Registration Statement and the related prospectus.

     IN WITNESS WHEREOF the undersigned, by authority duly given, has caused this Notice and
Questionnaire to be executed and delivered either in person or by its duly authorized agent.

	 	 	 	 	 	 	 	 	 	 	 	 	 
	Dated:	 	 	 	 	 	Beneficial Owner:	 	 	 	 
	 

	 	 
	 	 	 	 	 	 	 	 	 	 
	 
	 	 	 	 	 	 	 	 	 	 	 	 
	 

	 	 	 	 	 	By:	 	 	 	 	 	 
	 	 	 	 	 	 	 	 	 	 	 
	 

	 	 	 	 	 	 	 	Name:	 	 	 	 
	 

	 	 	 	 	 	 	 	Title:	 	 	 	 

PLEASE FAX A COPY OF THE COMPLETED AND EXECUTED NOTICE AND QUESTIONNAIRE, AND RETURN THE ORIGINAL
BY OVERNIGHT MAIL, TO:

A-4

 

Exhibit B

PLAN OF DISTRIBUTION

     We are registering the shares of common stock issued to the selling stockholders and to permit
the resale of these shares of common stock by the holders of the common stock from time to time
after the date of this prospectus. We will not receive any of the proceeds from the sale by the
selling stockholders of the shares of common stock. We will bear all fees and expenses incident to
our obligation to register the shares of common stock.

     The selling stockholders may sell all or a portion of the shares of common stock beneficially
owned by them and offered hereby from time to time directly or through one or more underwriters,
broker-dealers or agents. If the shares of common stock are sold through underwriters or
broker-dealers, the selling stockholders will be responsible for underwriting fees, discounts or
commissions or agent’s commissions. The shares of common stock may be sold in one or more
transactions at fixed prices, at prevailing market prices at the time of the sale, at varying
prices determined at the time of sale, or at negotiated prices. These sales may be effected in
transactions, which may involve crosses or block transactions,

	 	•	 	on any national securities exchange or quotation service on which the securities may
be listed or quoted at the time of sale;
	 
	 	•	 	in the over-the-counter market;
	 
	 	•	 	in transactions otherwise than on these exchanges or systems or in the
over-the-counter market;
	 
	 	•	 	through the writing of options, whether such options are listed on an options
exchange or otherwise;
	 
	 	•	 	ordinary brokerage transactions and transactions in which the broker-dealer solicits
purchasers;
	 
	 	•	 	block trades in which the broker-dealer will attempt to sell the shares as agent but
may position and resell a portion of the block as principal to facilitate the
transaction;
	 
	 	•	 	purchases by a broker-dealer as principal and resale by the broker-dealer for its
account;
	 
	 	•	 	an exchange distribution in accordance with the rules of the applicable exchange;
	 
	 	•	 	privately negotiated transactions;
	 
	 	•	 	broker-dealers may agree with the selling stockholders to sell a specified number of
such shares at a stipulated price per share;
	 
	 	•	 	a combination of any such methods of sale; and

B-1

 

	 	•	 	any other method permitted pursuant to applicable law.

     If the selling stockholders effect such transactions by selling shares of common stock to or
through underwriters, broker-dealers or agents, such underwriters, broker-dealers or agents may
receive commissions in the form of discounts, concessions or commissions from the selling
stockholders or commissions from purchasers of the shares of common stock for whom they may act as
agent or to whom they may sell as principal (which discounts, concessions or commissions as to
particular underwriters, broker-dealers or agents may be in excess of those customary in the types
of transactions involved). In connection with sales of the shares of common stock or otherwise,
the selling stockholders may enter into hedging transactions with broker-dealers, which may in turn
engage in short sales of the shares of common stock in the course of hedging in positions they
assume. The selling stockholders may also loan or pledge shares of common stock to broker-dealers
that in turn may sell such shares.

     The selling stockholders may pledge or grant a security interest in some or all of the shares
of common stock owned by them and, if they default in the performance of their secured obligations,
the pledgees or secured parties may offer and sell the shares of common stock from time to time
pursuant to this prospectus or any amendment to this prospectus under Rule 424(b)(3) or other
applicable provision of the Securities Act of 1933, as amended, amending, if necessary, the list of
selling stockholders to include the pledgee, transferee or other successors in interest as selling
stockholders under this prospectus. The selling stockholders also may transfer and donate the
shares of common stock in other circumstances in which case the transferees, donees, pledgees or
other successors in interest will be the selling beneficial owners for purposes of this prospectus.

     The selling stockholders and any broker-dealer participating in the distribution of the shares
of common stock may be deemed to be “underwriters” within the meaning of the Securities Act, and
any commission paid, or any discounts or concessions allowed to, any such broker-dealer may be
deemed to be underwriting commissions or discounts under the Securities Act. At the time a
particular offering of the shares of common stock is made, a prospectus supplement, if required,
will be distributed which will set forth the aggregate amount of shares of common stock being
offered and the terms of the offering, including the name or names of any broker-dealers or agents,
any discounts, commissions and other terms constituting compensation from the selling stockholders
and any discounts, commissions or concessions allowed or reallowed or paid to broker-dealers.

     Under the securities laws of some states, the shares of common stock may be sold in such
states only through registered or licensed brokers or dealers. In addition, in some states the
shares of common stock may not be sold unless such shares have been registered or qualified for
sale in such state or an exemption from registration or qualification is available and is complied
with.

     There can be no assurance that any selling stockholder will sell any or all of the shares of
common stock registered pursuant to the shelf registration statement, of which this prospectus
forms a part.

B-2

 

     The selling stockholders and any other person participating in such distribution will be
subject to applicable provisions of the Securities Exchange Act of 1934, as amended, and the rules
and regulations thereunder, including, without limitation, Regulation M of the Exchange Act, which
may limit the timing of purchases and sales of any of the shares of common stock by the selling
stockholders and any other participating person. Regulation M may also restrict the ability of any
person engaged in the distribution of the shares of common stock to engage in market-making
activities with respect to the shares of common stock. All of the foregoing may affect the
marketability of the shares of common stock and the ability of any person or entity to engage in
market-making activities with respect to the shares of common stock.

     We will pay all expenses of the registration of the shares of common stock pursuant to the
registration rights agreement, estimated to be $[ ] in total, including, without limitation,
Securities and Exchange Commission filing fees and expenses of compliance with state securities or
“blue sky” laws; provided, however, that a selling stockholder will pay all underwriting discounts
and selling commissions, if any. We will indemnify the selling stockholders against liabilities,
including some liabilities under the Securities Act, in accordance with the registration rights
agreements, or the selling stockholders will be entitled to contribution. We may be indemnified by
the selling stockholders against civil liabilities, including liabilities under the Securities Act,
that may arise from any written information furnished to us by the selling stockholder specifically
for use in this prospectus, in accordance with the related registration rights agreements, or we
may be entitled to contribution.

     Once sold under the registration statement, of which this prospectus forms a part, the shares
of common stock will be freely tradable in the hands of persons other than our affiliates.

B-3exv4w2

 

EXHIBIT 4.2

THIS WARRANT HAS BEEN ACQUIRED FOR INVESTMENT AND HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT
OF 1933, AS AMENDED (“SECURITIES ACT”), OR APPLICABLE STATE SECURITIES LAWS. THIS WARRANT AND THE
SHARES OF COMMON STOCK ISSUABLE UPON EXERCISE OF THIS WARRANT (“WARRANT SHARES”) MAY NOT BE SOLD,
PLEDGED, ASSIGNED OR OTHERWISE TRANSFERRED, NOR WILL ANY ASSIGNEE, VENDEE, PLEDGEE, TRANSFEREE OR
ENDORSEE HEREOF OR THEREOF BE RECOGNIZED BY THE ISSUER AS HAVING ACQUIRED THE WARRANT OR ANY
WARRANT SHARES FOR ANY PURPOSE, UNLESS (I) A REGISTRATION STATEMENT UNDER THE SECURITIES ACT WITH
RESPECT TO SUCH SECURITIES SHALL THEN BE IN EFFECT AND SUCH TRANSFER HAS BEEN QUALIFIED UNDER ALL
APPLICABLE STATE SECURITIES LAWS OR (II) AN EXEMPTION FROM SUCH REGISTRATION AND QUALIFICATION
SHALL BE AVAILABLE UNDER THE SECURITIES ACT AND SUCH LAWS, SUPPORTED BY AN OPINION OF COUNSEL THAT
SUCH REGISTRATION IS NOT REQUIRED, WHICH OPINION AND COUNSEL ARE REASONABLY ACCEPTABLE TO THE
COMPANY. THIS WARRANT AND THE REGISTRATION RIGHTS AGREEMENT (DEFINED BELOW) SET FORTH THE COMPANY’S
OBLIGATIONS TO REGISTER FOR RESALE THE WARRANT SHARES. A COPY OF THE REGISTRATION RIGHTS AGREEMENT
IS AVAILABLE FOR INSPECTION AT THE COMPANY’S OFFICE.

17,311,156 Warrants

COMMON STOCK PURCHASE WARRANT

OF

RENEGY HOLDINGS, INC.

     Renegy Holdings, Inc., a Delaware corporation (the “Company”), hereby certifies that, for
value received, the Robert M. Worsley and Christi M. Worsley Revocable Trust (the “Initial Warrant
Holder”, and together with any subsequent permitted transferee hereof, the “Warrant Holder”) is the
owner of the number of common stock purchase warrants (“Warrants”) specified above, each of which
entitles the holder thereof to purchase, at any time during the period commencing on the applicable
Commencement Date (as defined in Section 10(a)) and ending on the applicable Expiration
Date (as defined Section 10(b)), one fully paid and non-assessable share of common stock,
$0.001 par value per share, of the Company (“Common Stock”) at a purchase price equal to the
Exercise Price (as defined in Section 1.2) in lawful money of the United States of America.
These Warrants are being issued by the Company to the Initial Warrant Holder pursuant to that
certain Contribution and Merger Agreement, dated May 8, 2007, by and among the Company, Initial
Warrant Holder, Catalytica Energy Systems, Inc., a Delaware corporation, Snowflake Acquisition
Corporation, a Delaware corporation, Renegy,

 

 

LLC, an Arizona limited liability company, Renegy Trucking, LLC, an Arizona limited liability
company, Snowflake White Mountain Power, LLC, an Arizona limited liability company, Robert M.
Worsley and Christi M. Worsley (the “Contribution Agreement”), and that certain Assumption
Agreement, dated the date hereof, by and between the Company and the parties to the Contribution
Agreement (pursuant to which the Company agreed to assume and perform the rights and obligations of
the Company following the Closing (as defined in the Contribution Agreement) that are set forth in
the Contribution Agreement).

     1. WARRANT; EXERCISE PRICE.

          1.1 Each Warrant shall entitle the Warrant Holder the right to purchase one share of Common
Stock (individually, a “Warrant Share” severally, the “Warrant Shares”), subject to adjustment as
provided in Section 8.

          1.2 The purchase price payable upon exercise of each Warrant (“Exercise Price”) shall be $2.34
per share, subject to adjustment as provided in Section 8.

     2. EXERCISE OF WARRANTS.

          2.1 Exercise of Warrant

               (a) Exercise for Cash. Each of the Warrants which shall have vested in accordance
with the provisions of Section 9 below shall be exercisable during the period commencing on
the applicable Commencement Date and ending on the applicable Expiration Date (as such terms are
defined in Section 10 below) with respect to such vested Warrants, in whole, or from time
to time, in part in denominations not smaller than 5,000 Warrant Shares (subject to adjustment as
provided in Section 8), at the option of the Warrant Holder, upon delivery of this Warrant
to the Company, the Company’s Transfer Agent and the Company’s counsel, or such other person as the
Company may designate, together with a duly completed and executed form of exercise attached hereto
(indicating exercise by payment of the Exercise Price) and payment of an amount equal to the then
applicable Exercise Price multiplied by the number of Warrant Shares then being purchased upon such
exercise. The payment of the Exercise Price shall be in cash or by certified check or official
bank check, payable to the order of the Company.

               (b) Cashless Exercise. In lieu of exercising Warrants pursuant to Section
2.1(a), at any time more than two hundred forty (240) days from the date hereof that the Holder
shall not be able to sell the Warrant Shares pursuant to an effective registration statement filed
by the Company in accordance with the Registration Rights Agreement dated                     , 2007, by and
between the Initial Warrant Holder and the Company (the “Registration Rights Agreement”) (it being
understood that any period during which the Company is entitled to delay or suspend use of a
registration statement pursuant to the terms of the Registration Rights Agreement shall not be
deemed to be a time at which Holder is unable to sell the Warrant Shares pursuant to such an
effective registration statement), such Warrants may be exercised, in whole, or from time to time,
in part in denominations not smaller than 5,000 Warrant Shares, at the option of the Warrant
Holder, by surrender of certain of the Warrants in consideration of the issuance of Warrant Shares,
upon surrender to the Company, or such other person as the

2

 

Company may designate, together with a duly completed and executed form of exercise attached
hereto (indicating exercise by cashless exercise), specifying the number of Warrants to be
exercised. The number of Warrant Shares to be issued to the Warrant Holder upon such cashless
exercise shall be computed using the following formula:

X = (P)(Y)(A-B)/A

	 	 	 	 	 
	     Where X =	 	the number of Warrant Shares to be issued to the Warrant
Holder for the Warrants being converted.
	 
	 	 	 	 
	 

	 	P =
	 	the number of Warrants being converted
expressed as a decimal fraction.
	 
	 	 	 	 
	 

	 	Y =
	 	the total number of Warrant Shares issuable
upon exercise of the Warrants in full.
	 
	 	 	 	 
	 

	 	A =
	 	the fair market value of one Warrant Share
which shall mean the “last sale price” as
determined in accordance with Section 2.4.
	 
	 	 	 	 
	 

	 	B =
	 	The Exercise Price on the date of conversion.

          2.2 Each exercise of a Warrant shall be deemed to have been effected immediately prior to the
close of business on the day on which such Warrant shall have been surrendered to the Company as
provided in Section 2.1. At such time, the person or persons in whose name or names any
certificates for Warrant Shares shall be issuable upon such exercise in accordance with Section
2.3 shall be deemed to have become the holder or holders of record of the Warrant Shares
represented by such certificates.

          2.3 Subject to the provisions of Section 2.5, not later than three (3) trading days
after the exercise of this Warrant pursuant to Section 2.2, in full or in part, the
Company, at its expense, will cause to be issued in the name of, and delivered to, the Warrant
Holder, or, subject to the terms and conditions hereof, to such other individual or entity as such
Warrant Holder may direct:

               (a) a certificate or certificates for the number of full Warrant Shares to which such Warrant
Holder shall be entitled upon such exercise plus, in lieu of any fractional share to which such
Warrant Holder would otherwise be entitled, cash in an amount determined pursuant to Section
2.4 hereof, and

               (b) in case such exercise is in part only (including as a result of Section 2.5
hereof), a new Warrant or Warrants (dated the date hereof) of like tenor, stating on the face or
faces thereof the number of shares currently stated on the face of this Warrant minus the number of
such shares purchased by the Warrant Holder upon such exercise as provided in Section 2.1.

3

 

          The Company shall, upon request of the Holder, use commercially reasonable efforts to deliver
any certificate or certificates required to be delivered by the Company hereunder electronically
through the Depository Trust Corporation or another established clearing corporation performing
similar functions, if available.

          2.4 The Company shall not be required upon the exercise of this Warrant to issue any
fractional shares, but shall make an adjustment thereof in cash on the basis of the “last sale
price” (as defined below) of the Common Stock on the trading day immediately prior to the date of
exercise. For purposes of this Section 2.4, “last sale price” means (i) if the Common
Stock is listed on a national securities exchange or the Nasdaq Global Market or Nasdaq Capital
Market, the last trading price per share of the Common Stock for such date, (ii) if the Common
Stock is quoted on the NASD OTC Bulletin Board (or successor such as the Bulletin Board Exchange),
the closing bid price of the Common Stock on such date, (iii) if the Common Stock is traded in the
residual over-the-counter market, the closing bid price for the Common Stock for such date as
reported by the Pink Sheets, LLC or similar publisher of such quotations, and (iv) if the fair
market value of the Common Stock cannot be determined pursuant to clause (i), (ii) or (iii) above,
such price as the Special Committee (as defined in Section 13) shall determine, in good
faith.

          2.5 In the event of a dispute between the Company and a Warrant Holder as to (i) the
calculation of the Exercise Price (including, without limitation, the calculation of any adjustment
to the Exercise Price following any adjustment thereof), or (ii) the number of Warrant Shares
issuable upon exercising any Warrants, the Company shall issue to such Warrant Holder the number of
Warrant Shares that are not disputed in accordance with the time period set forth in Section
2.3 hereof, and shall submit the disputed calculations to a certified public accounting firm of
national reputation (other than the Company’s regularly retained accountants) by such date. The
Company shall cause such accountant to calculate the Exercise Price in accordance herewith and to
notify the Company and such Holder of the results in writing no later than five (5) business Days
following the day on which such accountant received the disputed calculations (the “Dispute
Procedure”). Such accountant’s calculation shall be deemed conclusive absent manifest error or
fraud. The fees of any such accountant shall be borne by the party whose calculations were most at
variance with those of such accountant.

          2.6 If the Company fails to deliver to the Holder a certificate or certificates representing
the Warrant Shares and cash in lieu of any fractional shares in accordance with Section
2.3, then the Warrant Holder will have the right to rescind the exercise of the applicable
Warrants.

          2.7 The Warrants are not redeemable by the Company.

     3. REGISTRATION AND TRANSFER ON COMPANY BOOKS.

          3.1 The Company (or an agent of the Company) will maintain a register containing the names and
addresses of the Warrant Holders. Any Warrant Holder may change its, his or her address as shown
on the warrant register by written notice to the Company requesting such change.

4

 

          3.2 The Company shall register upon its books any transfer of a Warrant upon surrender of same
as provided in Section 6.

     4. RESERVATION OF SHARES. The Company will at all times reserve and keep available,
solely for issuance and delivery upon the exercise of this Warrant, such Warrant Shares and other
stock, securities and property, as from time to time shall be issuable upon the exercise of this
Warrant. The Company covenants that all Warrant Shares so issuable when issued will be duly and
validly issued and fully paid and non-assessable.

     5. EXCHANGE, LOSS OR MUTILATION OF WARRANTS. Warrants are exchangeable, without
expense, at the option of the Warrant Holder, upon presentation and surrender hereof to the Company
for other warrants of different denominations entitling the holder thereof to purchase in the
aggregate the same number of shares of Common Stock purchasable hereunder on the same terms and
conditions as provided herein. Subject to the provisions of Section 6, if applicable, this
Warrant may be divided or combined with other warrants which carry the same rights upon
presentation hereof at the Company’s office together with a written notice specifying the names and
denominations in which new Warrants are to be issued and signed by the Warrant Holder hereof;
provided this Warrant may not be divided into a Warrant exercisable for an amount less than 5,000
shares, as such amount may be adjusted pursuant to the terms of Section 8. The term
“Warrant” as used herein includes any Warrants into which this Warrant may be divided or exchanged.
Upon receipt by the Company of reasonable evidence of the ownership and the loss, theft,
destruction or mutilation of this Warrant and, in the case of loss, theft or destruction, receipt
of indemnity reasonably satisfactory to the Company, or, in the case of mutilation, upon surrender
and cancellation of the mutilated Warrant, the Company shall execute and deliver in lieu thereof a
new Warrant of like tenor and date representing an equal number of Warrants.

     6. LIMITATIONS ON TRANSFER; RESTRICTIVE LEGEND.

          6.1 The Warrant Holder acknowledges that the Warrants and the Warrant Shares have not been
registered under the Securities Act and the rules and regulations thereunder, or any successor
legislation, and agrees not to sell, pledge, distribute, offer for sale, transfer or otherwise
dispose of any Warrant, or any Warrant Shares issued upon its exercise, in except in compliance
with the requirements of Section 6.2.

          6.2 The Warrants and the rights granted to the Warrant Holder are transferable, in whole or in
part (provided that the Warrant may not be transferred such that the Warrant is exercisable for
less than 5,000 shares, as such amount may be adjusted pursuant to Section 8, upon
surrender of this Warrant, together with a properly executed assignment in the form attached
hereto, at the office or agent of the Company only to the Warrant Holder’s spouse, the ancestors or
descendents of the Warrant Holder or his spouse, or any ancestor or descendant of any such
ancestors or descendants, or any trust for the benefit of any of the foregoing persons; provided,
however, that if at the time of the surrender of this Warrant in connection with any transfer or
exchange of this Warrant, this Warrant shall not be registered for resale under the Securities Act
or under applicable state securities or blue sky laws, then the Company may require, as a condition
of allowing such transfer or exchange (i) a written opinion of counsel, which opinion and counsel
are reasonably acceptable to the Company, to the effect that such

5

 

transfer or exchange may be made without registration under the Securities Act or under
applicable state securities or blue sky laws, and (ii) that any transferee of the Warrant execute
and deliver to the Company a document containing investment representations and warranties
substantially similar to those set forth in the Contribution Agreement pursuant to which the
Initial Warrant Holder acquired this Warrant.

          6.3 Certificates delivered to the Warrant Holder or its designees upon exercise hereof shall
be imprinted with a legend in substantially the following form if such Warrant Shares are not
registered for resale at the time of exercise:

     “This security has been acquired for investment and has not been registered under
the Securities Act of 1933, as amended (the “Act”), or applicable state securities
or “blue sky” laws. This security may not be sold, pledged, assigned or otherwise
transferred nor will any assignee, pledgee, vendee, transferee, endorsee thereof be
recognized by the issuer as having acquired such securities for any purpose unless
(i) a registration statement under the Act with respect to such security shall then
be in effect and such transfer has been qualified under all applicable state
securities or “blue sky” laws or (ii) an exemption therefrom shall be available
under the Act and such laws, supported by an opinion of counsel that such
registration is not required, which opinion and counsel are reasonably satisfactory
to the Company and its counsel.”

     7. REGISTRATION RIGHTS OF WARRANT HOLDER. The Warrant Shares are Registrable
Securities pursuant to, and subject to, the terms of the Registration Rights Agreement.

     8. ADJUSTMENT OF EXERCISE PRICE AND NUMBER OF WARRANT SHARES DELIVERABLE. The
Exercise Price and the number of Warrant Shares purchasable pursuant to each Warrant shall be
subject to adjustment from time to time as hereinafter set forth in this Section 8:

               (a) If the Company shall (i) issue any shares of its Common Stock as a stock dividend or (ii)
subdivide the number of outstanding shares of its Common Stock into a greater number of shares, the
Exercise Price shall be proportionately reduced and the number of Warrant Shares at that time
purchasable pursuant to this Warrant shall be proportionately increased. If the Company shall
reduce the number of outstanding shares of Common Stock by combining such shares into a smaller
number of shares, the Exercise Price per Warrant Share shall be proportionately increased and the
number of Warrant Shares at that time purchasable pursuant to this Warrant shall be proportionately
decreased. If the Company shall, at any time during the life of this Warrant, declare a dividend
payable in cash on its Common Stock and shall at substantially the same time offer to its
stockholders a right to purchase new Common Stock from the Company from the proceeds of such
dividend or for an amount substantially equal to the dividend, for purposes of this Warrant, all
Common Stock so issued shall be deemed to have been issued as a stock dividend. Any dividend paid
or distributed upon the Common Stock in stock of any other class of securities convertible into
shares of Common Stock shall be treated as a dividend paid in Common Stock to the extent that
shares of Common Stock are issuable upon conversion thereof.

6

 

               (b) If the Company shall be recapitalized by reclassifying its outstanding Common Stock,
(other than a change in par value or a subdivision or combination as provided in Section
8(a)), or the Company or a successor corporation shall consolidate or merge with or convey all
or substantially all of its or of any successor corporation’s property and assets to any other
corporation or corporations (any such other corporations being included within the meaning of the
term “successor corporation” hereinbefore used), then, as a condition of such recapitalization,
consolidation, merger or conveyance, lawful and adequate provision shall be made whereby the
Warrant Holder shall thereafter have the right to receive upon the exercise hereof the kind and
amount of shares of stock or other securities or property which such Warrant Holder would have been
entitled to receive if, immediately prior to any such reorganization or reclassification, such
Warrant Holder had held the number of shares of Common Stock which were then purchasable upon the
exercise of this Warrant. In any such case, appropriate adjustment shall be made in the
application of the provisions set forth herein with respect to the rights and interest thereafter
of the Warrant Holder such that the provisions set forth in this Section 8 (including
provisions with respect to adjustment of the Exercise Price and number of shares purchasable upon
the exercise of this Warrant) shall thereafter be applicable, as nearly as may be in relation to
any shares of stock or other securities or property thereafter deliverable upon the exercise of
this Warrant.

               (c) If the Company shall sell all or substantially all of its property or dissolve, liquidate,
or wind up its affairs, lawful provision shall be made as part of the terms of any such sale,
dissolution, liquidation or winding up, so that the holder of this Warrant may thereafter receive
upon exercise hereof in lieu of each Warrant Share for which the Warrant is then exercisable that
it would have been entitled to receive, the same kind and amount of any securities or assets as may
be issuable, distributable or payable upon any such sale, dissolution, liquidation or winding up
with respect to each share of Common Stock of the Company, provided, however, that in any case of
any such sale or of dissolution, liquidation or winding up, the right to exercise this Warrant
shall terminate on a date fixed by the Company; such date so fixed to be not earlier than 5:00
p.m., Eastern time, on the forty-fifth (45th) day next succeeding the date on which
notice of such termination of the right to exercise this Warrant has been given by mail to the
registered holder of this Warrant at its address as it appears on the books of the Company.

               (d) No adjustment in the per share Exercise Price shall be required unless such adjustment
would require an increase or decrease in the Exercise Price by at least $0.01; provided, however,
that any adjustments that by reason of this subsection are not required to be made shall be carried
forward and taken into account in any subsequent adjustment. All calculations under this
Section 8 shall be made to the nearest cent or to the nearest 1/100th of a share, as the
case may be.

               (e) The Company will not, by amendment of its Certificate of Incorporation or through any
reorganization, transfer of assets, consolidation, merger, dissolution, issue or sale of securities
or any other voluntary action, avoid or seek to avoid the observance or performance of any of the
terms to be observed or performed hereunder by the Company but will at all times in good faith
assist in the carrying out of all the provisions of this Section 8 and in the taking of all
such actions as may be necessary or appropriate in order to protect against impairment of the
rights of the Warrant Holder to adjustments in the Exercise Price.

7

 

               (f) Upon the happening of any event requiring an adjustment of the Exercise Price hereunder,
the Company shall give written notice thereof within five (5) business days to the Warrant Holder
stating the adjusted Exercise Price and the adjusted number of Warrant Shares resulting from such
event and setting forth in reasonable detail the method of calculation and the facts upon which
such calculation is based.

     9. VESTING. The Warrants will vest and become exercisable according to the following
schedule of milestones (each, an “Operating Milestone”):

               (a) If (A) the Plant (as defined in the Contribution Agreement) has achieved Commercial
Operation (as defined in that certain Credit Agreement dated as of September 1, 2006, by and among
Renegy, LLC (“Renegy”), Renegy Trucking, LLC (“Renegy Trucking”), Snowflake White
Mountain Power, LLC (collectively with Renegy and Renegy Trucking, the “Companies”),
CoBank, ACB, as Administrative Agent, Collateral Agent and LC Issuer, and the financial
institutions named therein (the “Credit Agreement”)) in accordance with the terms of the
Project Documents by no later than July 1, 2008, and (B) there has not occurred an Event of
Default (as defined in the Credit Agreement) or any other material breach or default by any of the
Companies, and there are no events or circumstances existing that could reasonably be expected to
constitute, or result in, an Event of Default or other material breach or default, under the
Project Documents, then 5,770,386 Warrants (subject to adjustment pursuant to Section 8)
shall vest.

               (b) If one or more renewable energy power generation plants (other than the Plant) based on
“Eligible Renewable Energy Resources” (as defined in Rule R14-2-1802 of the Arizona Renewable
Energy Standard and Tariff Rules adopted by the Arizona Corporation Commission as of the date
hereof, regardless of whether all or any portion of such Rule R14-2-1802 is later determined to be
unenforceable or invalid by any governmental authority, and as may be amended from time to time, or
any successor to such rule) that are owned by the Company and generating in the aggregate in excess
of ten (10) megawatts in capacity have (i) commenced and maintained commercial operations for
ninety (90) continuous days at the load and output requirements required by the power purchase
agreement(s) and financing documents related to such plants, and (ii) during such ninety (90) day
period, such commercial operation occurs in accordance with, and there are no material defaults,
breaches or violations, or events or circumstances that could reasonably be expected to result in
or constitute, a material default, breach or violation under, such power purchase agreement(s) or
financing documents (together (i) and (ii) are the “Operational Requirements”), then
5,770,385 Warrants (subject to adjustment pursuant to Section 8) shall vest.

               (c) Upon the earlier to occur of either one of the following two alternatives, then 5,770,385
Warrants (subject to adjustment pursuant to Section 8) shall vest:

                    (i) An additional renewable energy power generation plant or plants (other than the Plant and
the plants contemplated by Section 9(b)), based on Eligible Renewable Energy Resources (as
defined above), that are owned by the Company and generating in the aggregate in excess of ten (10)
megawatts in capacity achieve the Operational Requirements; or

8

 

                    (ii) Construction has commenced on not less than two additional renewable energy power
generation plants (other than the Plant and the plants contemplated by Section 9(b)) based
on Eligible Renewable Energy Resources (as defined above) designed to generate in the aggregate in
excess of twenty (20) megawatts in capacity, for which power purchase agreements have been duly
executed and delivered by the Company (or any of its subsidiaries), and construction financing has
been obtained sufficient to allow completion and attainment of commercial operation of such plants.

For the avoidance of doubt, in no event shall more than 5,770,385 Warrants vest under this
Section 9(c).

Notwithstanding the foregoing provisions of this Section 9, provided that the other
applicable requirements of Sections 9(b) and 9(c) are met, any requirement in
Sections 9(b) and 9(c) related to ownership by the Company of power generation
plants (other than the Plant) shall also be deemed to be satisfied by (i) one or more cogeneration
steam plants owned by the Company and capable of generating in the aggregate in excess of ten (10)
megawatts of electricity if devoted exclusively to that purpose; or (ii) one or more biofuel
production facilities owned by the Company and capable of producing biofuel that would support the
commercial operation of one or more power generation plants generating in the aggregate in excess
of ten (10) megawatts of electricity if such fuels were devoted exclusively to that purpose,
provided, that for purposes of determining the number of megawatts of electricity generated by any
such biofuel production facility, a turbine efficiency rating of 30% shall be assumed.

     10. COMMENCEMENT DATE; EXPIRATION DATE.

               (a) The term “Commencement Date” shall mean, with respect to each portion of the Warrants
that vests in accordance with the provisions of Section 9 above, the date on which the
Operating Milestone applicable to such portion of the Warrants are achieved.

               (b) The term “Expiration Date” shall mean, with respect to each portion of the Warrants that
vests in accordance with the provisions of Section 9 above, 5:00 p.m. Eastern time on the
date that is the later of (a) the four (4) four year anniversary of the date of issuance of the
Warrants and (b) the two (2) year anniversary of the Commencement Date applicable to such portion
of the Warrants; provided that in no event shall the Expiration Date be later than the six (6) year
anniversary of the date of issuance of the Warrants; and provided further that, in the event the
applicable Expiration Date determined in accordance with the foregoing shall in the State of New
York be a holiday or a day on which banks are authorized to close, then the applicable Expiration
Date shall mean 5:00 p.m. Eastern time on the next following day which in the State of New York is
not a holiday or a day on which banks are authorized to close.

     11. RIGHTS OF THE HOLDER. The Warrant Holder shall not, by virtue hereof, be entitled
to any rights of a stockholder in the Company, either at law or equity, and the rights of the
Warrant Holder are limited to those expressed in the Warrant and are not enforceable against the
Company except to the extent set forth herein.

9

 

     12. NOTICES OF RECORD DATE. In case: (a) the Company shall take a record of the
holders of its Common Stock (or other stock or securities at the time deliverable upon the exercise
of this Warrant) for the purpose of entitling or enabling them to receive any dividend or other
distribution, or to receive any right to subscribe for or purchase any shares of any class or any
other securities, or to receive any other right, or (b) of any capital reorganization of the
Company, any reclassification of the capital stock of the Company, any consolidation or merger of
the Company with or into another corporation (other than a consolidation or merger in which the
Company is the surviving entity), or any transfer of all or substantially all of the assets of the
Company, or (c) of the voluntary or involuntary dissolution, liquidation or winding-up of the
Company, then, and in each such case, the Company will mail or cause to be mailed to the Warrant
Holder a notice specifying, as the case may be: (i) the date on which a record is to be taken for
the purpose of such dividend, distribution or right, and stating the amount and character of such
dividend, distribution or right, or (ii) the effective date on which such reorganization,
reclassification, consolidation, merger, transfer, dissolution, liquidation or winding-up is to
take place, and the time, if any is to be fixed, as of which the holders of record of Common Stock
(or such other stock or securities at the time deliverable upon the exercise of this Warrant)
shall be entitled to exchange their shares of Common Stock (or such other stock or securities) for
securities or other property deliverable upon such reorganization, reclassification, consolidation,
merger, transfer, dissolution, liquidation or winding-up. Such notice shall be mailed at least
twenty (20) days prior to the record date or effective date for the event specified in such notice,
to the extent practicable or if not practicable, as promptly as practicable, provided that the
failure to mail such notice shall not affect the legality or validity of any such action.

     13. ADMINISTRATION SOLELY BY SPECIAL COMMITTEE. Prior to the End Date (as defined in
the Company’s Certificate of Incorporation), the Special Committee (as defined in the Company’s
Certificate of Incorporation) of the Company shall have exclusive authority to administer,
interpret and enforce this Warrant on behalf of the Company, including without limitation
determination of vesting and attainment of Operating Milestones pursuant to Section 9,
adjustments pursuant to Section 8 and amendments pursuant to Section 17. For the
avoidance of doubt, no such decision, interpretation or determination made by the Special Committee
in its administration of this Warrant on behalf of the Company shall be conclusive upon any Warrant
Holder, and nothing shall prevent the Warrant Holder from contesting any such decision,
interpretation or determination as not complying with the terms of the Warrant.

     14. SUCCESSORS. The rights and obligations of the parties to this Warrant will inure
to the benefit of and be binding upon the parties hereto and their respective permitted heirs,
successors, assigns, pledgees, transferees and purchasers.

     15. HEADINGS. The headings in this Warrant are for purposes of reference only and
shall not limit or otherwise affect the meaning of any provision of this Warrant.

     16. GOVERNING LAW. This Warrant shall be governed by and construed in accordance with
the laws of the State of Delaware as such laws are applied to contracts made and to be fully
performed entirely within that state between residents of that state.

     17. AMENDMENT AND WAIVER. Any term of this Warrant may be changed or waived only by
an instrument in writing signed by the party against whom enforcement of the

10

 

change or waiver is sought. The failure of a party to exercise any of its rights hereunder or
to insist upon strict adherence to any term or condition hereof on any one occasion shall not be
construed as a waiver or deprive that party of the right thereafter to insist upon strict adherence
to the terms and conditions of this Warrant at a later date. Further, no waiver of any of the
terms and conditions of this Warrant shall be deemed to or shall constitute a waiver of any other
term of condition hereof (whether or not similar).

     18. MAILING OF NOTICES, ETC. Any notice, request, instruction, correspondence or
other document to be given hereunder (except payment) shall be in writing and delivered to
personally or mailed by registered or certified mail, postage prepaid and return receipt requested,
or by facsimile, as follows:

	 	 	 	 	 
	 

	 	Registered Holder:
	 	To his or her last known address as indicated on the Company’s
books and records.
	 
	 	 	 	 
	 

	 	Initial Holder:
	 	c/o Robert M. Worsley

The Worsley Family Revocable Trust

3418 N. Val Vista Drive

Mesa, AZ 85213
	 
	 	 	 	 
	 

	 	 	 	Facsimile No.: (480) 718-7977
	 
	 	 	 	 
	 

	 	The Company:
	 	To the Company’s Chief Financial Officer at the
address of the Company’s principal office as set forth in the last filing by
the Company with the Securities and Exchange Commission.
	 
	 	 	 	 
	 

	 	 	 	Facsimile No.: (480) 556-5500

Each of the above addresses for notice purposes may be changed by providing appropriate notice
hereunder. Notice given by personal delivery or registered mail shall be effective upon actual
receipt. Notice given by facsimile shall be effective upon actual receipt if received during the
recipient’s normal business hours, or at the beginning of the recipient’s next normal business day
after receipt if not received during the recipient’s normal business hours. All Notices by
facsimile shall be confirmed by the sender thereof promptly after transmission in writing by
registered mail or personal delivery.

11

 

     IN WITNESS WHEREOF, the Company has caused this Warrant to be signed by its duly authorized
officer as of the ___day of                     , 2007.

	 	 	 	 	 
	 	RENEGY HOLDINGS, INC.

 	 
	 	By:  	 	 
	 	 	Name:  	 	 
	 	 	Title:  	 	 

 

 

	 	 	 	 	 

Notice of Exercise

To Be Executed by the Warrant Holder

In Order to Exercise Warrants

     The undersigned Warrant Holder hereby irrevocably elects to exercise                      Warrants represented by
this Warrant by:

(check one)

 ̈ payment of the Exercise Price in cash pursuant to Section 2.1(a) of the Warrant

 ̈ the cashless exercise option pursuant to Section 2.1(b) of the Warrant

for the shares of Common Stock issuable upon the exercise of such Warrants, and requests that
certificates for such shares of Common Stock shall be issued in the name of

PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER

                                        

 

 
 (please print or type name and address)

and be delivered to

 

 
 (please print or type name and address)

and if such number of Warrants shall not be all the Warrants evidenced by this Warrant, that a new
Warrant for the balance of such Warrants be registered in the name of, and delivered to, the
registered Warrant Holder at the address stated above.

     The undersigned hereby represents and warrants to the Company that it is an “Accredited
Investor” within the meaning of Rule 501(c) of the Securities Act of 1933, as amended (the
“Securities Act”), and is acquiring these securities for its own account and not with a view to, or
for sale in connection with, any distribution thereof, nor with any present intention of
distributing or selling the same. The undersigned further represents that it does not have any
contract, agreement, understanding or arrangement with any person to sell, transfer or grant the
shares of Common Stock issuable under this Warrant. The undersigned understands that the shares it
will be receiving are “restricted securities” under federal securities laws inasmuch as they are
being acquired from Renegy Holdings, Inc., in transactions not including any public offering and
that under such laws, such shares may only be sold pursuant to an effective and current
registration statement under the Securities Act or an exemption from the registration requirements
of the Securities Act and any other applicable restrictions including the requirements of state
securities and “blue sky” laws, in which event a legend or legends will be placed upon the
certificate(s) representing the Common Stock issuable under this Warrant denoting such
restrictions. The

 

 

undersigned understands and acknowledges that the Company will rely on the
accuracy of these representations and warranties in issuing the securities underlying the Warrant.

	 	 	 	 	 
	Dated:                                        
	 	 	 	 
	 

	 	 

(Signature of Registered Holder)
	 	 

 

 

ASSIGNMENT FORM

To be executed by the Warrant Holder

In order to Assign Warrants

FOR VALUE RECEIVED,                                        
           
           hereby sell, assigns and transfer unto

PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER

                                        

 

 

 
 (Please print or type name and address)

                                         of
the Warrants represented by this Warrant, and hereby irrevocably
constitutes and appoints                                          Attorney to transfer this Warrant on the books of
the Company, with full power of substitution in the premises.

	 	 	 	 	 
	Dated:                                        
	 	 	 	 
	 

	 	 

(Signature of Registered Holder)
	 	 
	 
	 	 	 	 
	 

	 	 

(Signature Guaranteed)

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