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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.

Business Editors

SUNNYVALE, Calif. For more information , visit www.

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

Individual investors can listen to the call at www.

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Find Catalytica Energy Systems on the Worldwide Web at
www.
"With the transformer, VaST customers can generate a new VPM in
the same microprocessor family by adding, removing or replacing
instructions in the VaST seed VPM instruction set.

About VaST

VaST Systems Technology Corporation provides tools and models for
embedded system design automation.

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The webcast is also being distributed through the Thomson
StreetEvents Network to both institutional and individual investors.
VPM-T enables VaST users to modify the instruction set of a VaST
seed virtual processor model, a capability that up until now only VaST
had possessed. VaST's solutions enable
architectural exploration and optimization , allowing users to create a
virtual system prototype in software that becomes the golden reference
model for the true concurrent development of hardware and software.
VaST's solutions deliver both high speed and cycle accuracy under
actual real-time software loads.

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com,
Thomson/CCBN's individual investor portal, powered by StreetEvents.

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fulldisclosure.
Institutional investors can access the call via Thomson's
password-protected event management site, StreetEvents
(www. 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. VaST's products dramatically improve
time to market and quality, and reduce development costs and risk.

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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. 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.----VaST Systems
Technology Corporation, the embedded system design automation company,
today announced the addition of Virtual Processor Model Transformer
(VPM-T), phase 1, to its line of powerful virtual system prototyping
tools.
Current customers include worldwide leaders in semiconductors,
automotive electronics, wireless devices and consumer electronics.

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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.streetevents .

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CatalyticaEnergy.

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CatalyticaEnergy.

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"Our constructor class of tools puts more control in the hands of
our users, becoming an increasingly valuable competitive weapon in
their race for differentiation and time to market. For users who will
continue to rely on VaST for creation of their entire virtual system,
we will model the processors, buses, bus bridges and peripherals in a
turnkey delivery system that runs with cycle accuracy at near hardware
speeds," commented Alain Labat, VaST CEO.

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----Catalytica Energy
Systems, Inc.

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Virtual Processor Model Transformer , currently in use by early
adopters, will be available for general release in 2006, with pricing
starting at $100,000 for a one-year, time-based, node-locked license.vastsystems.

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The VaST seed model consists of the instruction set,
micro-architecture, pipelining and other behavior of a specific
microprocessor.

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The
call will be webcast by Thomson/CCBN and can be accessed via the
Company 's web site at www.
This capability has never been available to chip designers before, and
can be a large competitive advantage.

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"
During the last 12 months, VaST has delivered a family of tools
with "constructor" capability, including platform constructor
technology (PCT) within CoMET, which enables users to quickly
configure an entire virtual system prototype, and Peripheral Device
Builder (PDB), which automates the creation of peripheral device
models.

Please do not submit to this section if your site is not of this type.

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Note to editors:

A graphic representing VaST 's VPM-T product is available upon
request.

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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.

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(NASDAQ:CESI), announced today that it will report first
quarter financial results after the market closes on Thursday, May 12,
2005. ET the same day.

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.

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The behavior,
timing and mnemonic aspects of an instruction can be changed
independently," said VaST founder and CTO, Graham Hellestrand.

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Through its SCR-Tech subsidiary
(www.

VaST Systems Releases Virtual Processor Model Transformer Latest in Line of Powerful ``Constructor '' Tools; Virtual Processor Model Transformer Allows Users M

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Business Editors

GILBERT, Ariz.scr-tech.

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VaST is headquartered in Sunnyvale, with sales and support offices
worldwide.

This includes scale models, model railroading, remote-controlled (R/C) craft, and any other models built for recreational or entertainment value.

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m. Pacific Time, 4:45 p.m. "The
VPM-T enables our users to quickly enhance or change a VaST virtual
processor model and make it available to software and hardware
developers within their own organizations and their customer base.