Active Power's OEM Channel Increases Sales Volume, Grows Momentum in Critical UPS...

Active Power's OEM Channel Increases Sales Volume, Grows Momentum in Critical UPS Market

200 Percent Increase Over Previous Three Months
AUSTIN, Texas--(Business Wire)--
Active Power (NASDAQ: ACPW), inventor and manufacturer of the most
energy-efficient critical power systems in the world, announced today
that its long standing OEM partnership with Caterpillar Inc. (NYSE:
CAT) continues to yield solid results. Caterpillar has ordered more
than 21 megawatts of critical backup power during the past three
months, representing a nearly 200 percent increase over the prior
three month period. The systems have been ordered to support a variety
of mission critical applications.

"Our core product differentiators of energy efficiency, space
savings, reliability, rugged design and environmental sensitivity are
resonating in the marketplace and certainly for our OEM partners,"
said Jim Clishem, Active Power CEO and president. "Caterpillar is a
significant part of our distribution strategy and we are extremely
pleased with their increasing momentum and commitment to critical
power systems solution sales."

"With more than 1,950 flywheels in systems deployed worldwide and
more than 46 million hours of field run time, Active Power is an
important force in delivering flywheel based UPS systems to market,"
said Farah Saaed, senior consultant, Energy and Power Systems at Frost
and Sullivan. "Active Power holds the patent for integrated flywheel
energy storage and UPS. This design yields a number of competitive
advantages over conventional UPS systems with batteries including
space savings; higher power densities; and the highest energy
efficiency rating available in the market today."

About Active Power

Active Power (NASDAQ: ACPW) provides efficient, reliable and green
critical power solutions and uninterruptible power supply (UPS)
systems to enable business continuity in the event of power
disturbances. Founded in 1992, Active Power's flywheel-based UPS
systems protect critical operations in data centers, healthcare
facilities, manufacturing plants, broadcast stations and governmental
agencies in more than 40 countries. Active Power also offers CoolAir,
the only solution that provides both backup power and backup cooling.
With expert power system engineers and worldwide services and support,
Active Power ensures organizations have the power to perform. For more
information, please visit www.activepower.com.

Cautionary Note Regarding Forward-Looking Statements

This release may contain forward-looking statements that involve
risks and uncertainties. Any forward-looking statements and all other
statements that may be made in this news release that are not
historical facts are subject to a number of risks and uncertainties,
and actual results may differ materially. Specific risks include
delays in new product development, product performance and quality
issues and the acceptance of our current and new products by the power
quality market. Please refer to Active Power filings with the
Securities and Exchange Commission for more information on the risk
factors that could cause actual results to differ.

Active Power, the Active Power logo, CleanSource and CoolAir are
registered trademarks of Active Power, Inc. All other trademarks are
the properties of their respective companies.

Active Power, Austin
Investor Contact:
John Penver, 512-744-9234
Chief Financial Officer
jpenver@activepower.com
or
Media Contact:
Lee Higgins, 512-744-9488
Public Relations Manager
lhiggins@activepower.com

Copyright Business Wire 2008