Catalytica Energy Systems To Announce First Quarter Financial Results on Thursday, May 12th

GILBERT, Ariz.--April 28, 2005--Catalytica Energy Systems, Inc. , announced today that it will report first quarter financial results after the market closes on Thursday, May 1, 20052, 2005.

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 is a leading provider of innovative emissions solutions designed to ease the environmental impact of combustion-related applications in the power generation and transportation industries. Through its SCR-Tech subsidiary (www.scr-tech.com), the Company offers a variety of services for coal-fired power plants and other utility-scale power generation facilities that use selective catalytic reduction (SCR) systems to reduce nitrogen oxides (NOx) emissions. These services include SCR catalyst cleaning and regeneration, as well as SCR system management and consulting services to optimize efficiency and reduce overall operating and maintenance costs. Catalytica Energy Systems' other business activities include the design, development and manufacture of advanced products based on its proprietary catalyst and fuel processing technologies to offer cost-effective solutions for reducing NOx emissions from diesel engines and natural gas-fired turbines. The Company's diesel fuel processing technology is designed to facilitate significant NOx reduction from mobile, stationary and off-road diesel engines by improving the performance of NOx adsorber catalyst systems. Catalytica Energy Systems' commercially-available Xonon Cool Combustion(R) system offers a breakthrough pollution prevention approach for gas turbines to achieve ultra-low emissions power generation through a proprietary catalytic combustion process. Other activities include the development of fuel processing systems for fuel cells used in stationary, auxiliary and back-up power applications. Find Catalytica Energy Systems on the Worldwide Web at www.CatalyticaEnergy.com.