MCMAHON WILLIAM J 4

4 · CATALYTICA ENERGY SYSTEMS INC · Filed Oct 2, 2007

Form 4

Period: 2007-10-01

President, SCR-Tech, LLC

Transactions

Disposition to Issuer
Incentive Stock Option
2007-10-01−50,000→ 0 total
Exercise: $1.91From: 2007-10-01Exp: 2015-05-03→ Common Stock (50,000 underlying)
Disposition to Issuer
Common Stock
2007-10-01−13,089→ 0 total
Disposition to Issuer
Common Stock
2007-10-01−29,311→ 0 total
Disposition to Issuer
Incentive Stock Option
2007-10-01−94,300→ 0 total
Exercise: $1.92From: 2007-10-01Exp: 2017-01-11→ Common Stock (94,300 underlying)
Disposition to Issuer
Nonqualified Stock Option
2007-10-01−25,000→ 0 total
Exercise: $1.15From: 2007-10-01Exp: 2016-03-22→ Common Stock (25,000 underlying)

Footnotes (6)

[F1]Disposed of pursuant to the merger (the "Merger") of Snowflake Acquisition Corporation, a wholly-owned subsidary of Renegy Holdings, Inc. ("Renegy"), with and into Catalytica Energy Systems, Inc. ("Catalytica") in exchange for 1,870 shares of Renegy common stock having a market value of $8.15 per share on the effective date of the Merger.
[F2]Represents restricted stock units. The vesting of all restricted stock units was accelerated effective October 1, 2007 and consequently became shares of common stock.
[F3]Disposed of pursuant to the Merger in exchange for 4,187 shares of Renegy common stock having a market value of $8.15 per share on the effective date of the Merger.
[F4]The vesting of this option was accelerated in connection with the Merger, and was assumed by Renegy and replaced with an option to purchase 7,142 shares of Renegy common stock at $13.37 per share.
[F5]The vesting of this option was accelerated in connection with the Merger, and was assumed by Renegy and replaced with an option to purchase 3,571 shares of Renegy common stock at $8.05 per share.
[F6]The vesting of this option was accelerated in connection with the Merger, and was assumed by Renegy and replaced with an option to purchase 13,471 shares of Renegy common stock at $13.44 per share.

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