ADVISORY/Flywheel-based, Battery-Free Alternative Energy Source - Reliable, Quality Power for Mission Critical Operations from CATERPILLAR - Demo and Interview Opportunities.

Business-Finance, Energy, Technology, Environmental and Telecom

Editors; TV Business, Technology and News Assignment Editors

ADVISORY...for Wednesday & Thursday (Oct. 2 & 3)

--BUSINESS WIRE)--

Active Power (Nasdaq:ACPW)

        $30 BILLION DOLLARS IS LOST ANNUALLY BY U.S. FIRMS DUE TO
        POWER DISTURBANCES IN THE UNITED STATES (Source: Electric
        Power Research Institute, Palo Alto, Calif.)

        Today, the Illinois community is dependent on uninterrupted,
        conditioned electric power to keep the digital economy moving
        and growing. Hospitals, broadcast stations, research
        facilities, and other mission-critical centers must operate
        uninterrupted 7x24. Each of these industries requires, clean,
        conditioned, uninterrupted, electric power and must invest
        significant resources on backup power systems for the safety
        of its customers and protection of highly sensitive equipment.

WHO:    Caterpillar(R) - Patten Power Systems, Elmhurst IL
        &
        Active Power, Inc., Austin TX

        Caterpillar(R) is introducing to the Illinois area a
        commercially proven, battery-free Cat(R) UPS Uninterruptible
        Power Supply, ranging in power from 150 kVA to 900 kVA.
        Integrated with highly reliable flywheel technology, the
        Cat(R) UPS with 97% efficiency protects against sags, surges
        and outages. A flywheel motor-generator stores kinetic energy
        in its constantly spinning, low friction, 600-pound steel
        disc. Stored energy from the flywheel is instantly converted
        to electricity to power the critical load during utility
        disturbances or until a standby generator takes over.

WHAT:   Patten Power Systems, a Caterpillar(R) dealer, will
        demonstrate this break-through flywheel solution for
        journalists to report the latest technology in critical load
        protection. Reporters, photographers and videographers can
        witness the seamless transition of continuous power during a
        utility power outage. Journalists also will have the
        opportunity to interview the developers of the technology.
        Media kits are available on site.

        Patten is a leading provider of back-up power for critical
        operations in the Chicago area and now offers a battery-free
        uninterruptible power system (UPS) integrated with the
        flywheel technology developed by Active Power, Inc.
        (www.activepower.com). Patten can provide reliable power
        protection solutions against a full range of power events
        likely to affect critical facilities. (Seminars for engineers
        will be running Sept. 30 - Oct. 4 at Patten.)

WHEN:   Wednesday, Oct. 2, and Thursday, Oct. 3

WHERE:  615 W. Lake St., Elmhurst, IL 60126...630/530-2200
        (For map, go to URL:
        http://www.pattenpower.com/power/elmhurst_power_main.htm)

INVENTOR/
AWARDS:  Active Power Chairman and CEO, Joe Pinkerton, co-inventor of
         the CleanSource(R) flywheel technology, will be present to
         explain the industrial and environmental benefits of this
         inventive flywheel system solution. Active Power continues to
         unleash innovative technologies that meet the demand for
         high-growth, emerging power quality markets. As a leading
         innovator and manufacturer of battery-free solutions, the
         company currently has 32 issued patents in the United States.

         Discover Magazine recognized Active Power for Innovation in
         its category "because of its anticipated revolutionary impact
         on society," the promise of large-scale displacement of
         lead-acid batteries in conventional UPS systems. R&D magazine
         recognized the Cat UPS as one of the most significant 100
         inventions in 2001. Pinkerton received the Ernst & Young 2001
         Entrepreneur of the Year Award for High Tech Manufacturing.