Capstone Completes Underwriters Laboratories (UL) Scheduled Testing of the C200 Product

CHATSWORTH, Calif., June 1, 2009 (GLOBE NEWSWIRE) -- Capstone Turbine
Corporation (www.capstoneturbine.com) (Nasdaq:CPST), the world's leading clean
technology manufacturer of microturbine energy systems, today announced that it
has completed Underwriters Laboratories (UL) scheduled testing of its C200
MicroTurbine product in accordance with UL 2200 and UL 1741.

Compliance testing for UL 2200 Standard for Stationary Engine Generator
Assemblies evaluates the use of stationary engine generator assemblies intended
for installation and use in ordinary locations. These requirements are designed
to assess risk of fire, electric shock, or injury to persons. Testing covers
several National Fire and Protection Agency (NFPA) standards including NFPA-110
Standard for Emergency and Standby Power Systems. In addition to system design
and individual component evaluations, the C200 MicroTurbine product was
subjected to rain and thermal environment tests including operation in hot and
cold temperature extremes.

The C200 product was also tested to UL 1741 Standard for Inverters, Converters,
Controllers and Interconnection System Equipment for Use with Distributed Energy
Resources. UL 1741 requirements cover products intended for use in stand-alone
(not grid-connected) or utility-interactive (grid-connected) power systems.
Testing evaluates electrical safety and built-in protective relay functions.
Products covered by these requirements are intended to be installed in
accordance with the NFPA 70 National Electrical Code, IEEE 1547 Standard for
Interconnecting Distributed Resources with Electric Power Systems, and IEEE 519
Recommended Practices and Requirements for Harmonic Control in Electrical Power
Systems.

Capstone has already received certification for UL 1998 Standard for Safety
Software in Programmable Components. These requirements apply to non-networked
embedded microprocessor software whose failure is capable of resulting in a risk
of fire, electric shock, or injury to persons. Software programs are evaluated
for the development process used to capture errors, microelectronic fault
detection that prevents the normal execution of the program, and failure of the
program to perform its intended function.

"This is an important milestone in the commercialization of the C200 product,"
said Jim Crouse, Capstone's Executive Vice President of Sales and Marketing.
"Testing to the UL standards confirms the robustness of our product and affirms
that our product meets many of the local building code requirements that help
our customers reduce installation time and cost."

"We are pleased to have completed this final milestone required under the C200
Development and License Agreement with UTC Power Corporation," said Darren
Jamison, Capstone's Chief Executive Officer.

About Capstone Turbine

Capstone Turbine Corporation (www.capstoneturbine.com) (Nasdaq:CPST) is the
world's leading producer of low-emission microturbine systems and was the first
to market commercially viable microturbine energy products. Capstone Turbine has
shipped over 4,000 Capstone MicroTurbine(r) systems to customers worldwide.
These award-winning systems have logged millions of documented runtime operating
hours. Capstone Turbine is a member of the U.S. Environmental Protection
Agency's Combined Heat and Power Partnership, which is committed to improving
the efficiency of the nation's energy infrastructure and reducing emissions of
pollutants and greenhouse gases. A UL-Certified ISO 9001:2000 certified company;
Capstone Turbine is headquartered in the Los Angeles area with sales and/or
service centers in the New York metro area, Mexico City, Nottingham, Shanghai,
Singapore and Tokyo.

"Capstone Turbine Corporation" and "Capstone MicroTurbine" are registered
trademarks of Capstone Turbine Corporation. All other trademarks mentioned are
the property of their respective owners.

The Capstone Turbine Corporation logo is available at
http://www.globenewswire.com/newsroom/prs/?pkgid=6212

This press release contains "forward-looking statements," as that term is used
in the federal securities laws, about the advantages of compliance with UL
standards. Forward-looking statements may be identified by words such as
"expects," "objective," "intend," "targeted," "plan" and similar phrases. These
forward-looking statements are subject to numerous assumptions, risks and
uncertainties described in Capstone's filings with the Securities and Exchange
Commission that may cause Capstone's actual results to be materially different
from any future results expressed or implied in such statements. Capstone
cautions readers not to place undue reliance on these forward-looking
statements, which speak only as of the date of this release. Capstone undertakes
no obligation, and specifically disclaims any obligation, to release any
revisions to any forward-looking statements to reflect events or circumstances
after the date of this release or to reflect the occurrence of unanticipated
events.

-0-
CONTACT: Capstone Turbine Corp.
Investor and investment media inquiries:
818-407-3628
ir@capstoneturbine.com