Catalytica Energy Systems to Announce Second Quarter Financial Results on Thursday, August 10th.

GILBERT, Ariz. -- Catalytica Energy Systems, Inc. (Nasdaq:CESI), announced today that it will report second quarter financial results after the market closes on Thursday, August 10, 2006.

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 Gilbert, Arizona, provides innovative products and services to meet the growing demand for emissions control solutions in the power generation and transportation industries. 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. 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 diesel engine emissions. The Company's Xonon(R) Diesel Fuel Processing technology is designed to facilitate a significant reduction in NOx and particulate matter (PM) emissions from mobile and stationary diesel engines by improving the performance of NOx adsorber catalyst systems and diesel particulate filters. For more information, please visit www.CatalyticaEnergy.com.