Catalytica Energy Systems to Announce First Quarter 2007 Financial Results on Tuesday, May 15th

  
    
  
  
    
      Catalytica Energy Systems, Inc. (NASDAQ:CESI), announced today that it 
      will report first quarter 2007 financial results after the market closes 
      on Tuesday, May 15, 2007.
    
    
      In connection with this announcement, members of the public are invited 
      to listen to the Company's live quarterly conference call on the 
      Internet at 1:45 p.m. Pacific Time, 4:45 p.m. ET the same day. The call 
      will be webcast by Thomson/CCBN and can be accessed via the Company’s 
      web site at www.CatalyticaEnergy.com.
    
    
      The webcast is also being distributed through the Thomson StreetEvents 
      Network to both institutional and individual investors. Individual 
      investors can listen to the call at www.fulldisclosure.com, 
      Thomson/CCBN’s individual investor portal, 
      powered by StreetEvents. Institutional investors can access the call via 
      Thomson’s password-protected event management 
      site, StreetEvents (www.streetevents.com).
    
    
      About Catalytica Energy Systems
    
    
      Catalytica Energy Systems, based in Tempe, Arizona, provides 
      innovative products and services to meet the growing demand for clean 
      energy production, with a focus on cost-effective emissions control 
      solutions for the coal-fired power generation industry. Through its 
      SCR-Tech subsidiary, the Company offers a variety of services for 
      coal-fired power plants that use selective catalytic reduction (SCR) 
      systems to reduce nitrogen oxides (NOx) emissions. These services 
      include SCR catalyst management, cleaning and regeneration, as well as 
      consulting services to help power plant operators optimize efficiency 
      and reduce overall NOx compliance costs. For more information, please 
      visit www.CatalyticaEnergy.com.