We consent to the incorporation by reference in the Registration Statement (Form S-8 No.
333-146402) pertaining to the Renegy Holdings, Inc. 2007 Equity Incentive Plan and the Catalytica
Energy Systems, Inc. 1995 Stock Plan, of our reports dated
March 31, 2008 with respect to the
consolidated financial statements of Renegy Holdings, Inc. and the combined financial statements of Snowflake White Mountain Power LLC; Renegy LLC; and
Renegy Trucking LLC included in the Annual Report (Form 10-KSB) of Renegy Holdings, Inc. for the
year ended
December 31, 2007.