SEC Form 4
FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
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 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
1. Name and Address of Reporting Person*
ZACK ROBERT W
(Last) (First) (Middle)
301 WEST WARNER ROAD
SUITE 132
(Street)
TEMPE AZ 85284
(City) (State) (Zip)
2. Issuer Name and Ticker or Trading Symbol
Renegy Holdings, Inc. [ RNGY ] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director 10% Owner
X Officer (give title below) Other (specify below)
Executive VP and CFO
3. Date of Earliest Transaction (Month/Day/Year)
10/01/2007
4. If Amendment, Date of Original Filed (Month/Day/Year)
 6. Individual or Joint/Group Filing (Check Applicable Line)
X Form filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 10/01/2007 A 9,660 A (1) 9,660 D
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year) 7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Incentive Stock Option $24.85 10/01/2007 A 1,428 10/01/2007 04/01/2012 Common Stock 1,428 (2) 1,428 D
Incentive Stock Option $19.32 10/01/2007 A 12,142 10/01/2007 02/10/2013 Common Stock 12,142 (3) 12,142 D
Incentive Stock Option $28.217 10/01/2007 A 5,404 10/01/2007 01/26/2014 Common Stock 5,404 (4) 5,404 D
Nonqualified Stock Option $28.217 10/01/2007 A 4,595 10/01/2007 01/26/2014 Common Stock 4,595 (5) 4,595 D
Incentive Stock Option $16.87 10/01/2007 A 1,816 10/01/2007 01/31/2015 Common Stock 1,816 (6) 1,816 D
Nonqualified Stock Option $16.87 10/01/2007 A 1,840 10/01/2007 01/31/2015 Common Stock 1,840 (7) 1,840 D
Nonqualified Stock Option $8.05 10/01/2007 A 27,142 10/01/2007 03/22/2016 Common Stock 27,142 (8) 27,142 D
Incentive Stock Option $24.143 10/01/2007 A 1,428 10/01/2007 08/29/2013 Common Stock 1,428 (9) 1,428 D
Nonqualified Stock Option $9.45 10/01/2007 A 7,142 10/01/2007 11/06/2016 Common Stock 7,142 (10) 7,142 D
Nonqualified Stock Option $13.44 10/01/2007 A 11,828 10/01/2007 01/11/2017 Common Stock 11,828 (11) 11,828 D
Explanation of Responses:
1. Received in exchange for 67,622 shares of Catalytica Energy Sytems, Inc. (Catalytica") common stock in connection with the merger of Snowflake Acquisition Corporation, a wholly-owned subsidiary of Renegy Holdings, Inc. ("Renegy"), with and into Catalytica (the "Merger"). On the effective date of the Merger, the closing price of Renegy's common stock was $8.15 per share.
2. Received in the Merger in exchange for an incentive stock option to acquire 10,000 shares of Catalytica common stock at $3.55 per share.
3. Received in the Merger in exchange for an incentive stock option to acquire 85,000 shares of Catalytica common stock at $2.76 per share.
4. Received in the Merger in exchange for an incentive stock option to acquire 37,830 shares of Catalytica common stock at $4.013 per share
5. Received in the Merger in exchange for a nonqualified stock option to acquire 32,170 share of Catalytica common stock at $4.013 per share.
6. Received in the Merger in exchange for an incentive stock option to acquire 12,714 shares of Catalytica common stock at $2.41 per share.
7. Received in the Merger in exchange for a nonqualified stock option to acquire 12,886 share of Catalytica common stock at $2.41 per share.
8. Received in the Merger in exchange for a nonqualified stock option to acquire 190,000 shares of Catalytica common stock at $1.15 per share
9. Received in the Merger in exchange for an incentive stock option to acquire 10,000 shares of Catalytica common stock at $3.449 per share.
10. Received in the Merger in exchange for a nonqualified stock option to acquire 50,000 shares of Catalytica common stock at $1.35 per share.
11. Received in the Merger in exchange for a nonqualified stock option to acquire 82,800 shares of Catalytica common stock at $1.92 per share.
Kevin Lane, Attorney-in-fact 10/01/2007
** Signature of Reporting Person Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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