[0] ADVISORY/Caterpillar Dealer - Holt Power Systems and Active Power, Inc. Demonstrate Flywheel-Based, Uninterruptible Power Supply in Sacramento, CA, Dec. 14.

News/Assignment Editors & Environmental Writers

ADVISORY...for Friday (Dec. 14)

--(BUSINESS WIRE)

WHAT:  A power quality seminar and demonstration for journalists to
       unveil a breakthrough battery-free, energy solution to their
       audiences. The media can witness simulated power outages in
       which the flywheel system will provide ride-through utility
       power until the Caterpillar generator starts. CAT(R) UPS
       (uninterruptible power supply) system is integrated with a
       flywheel motor-generator, CleanSource(R), which stores kinetic
       energy in its constantly spinning, quiet, low friction steel
       disc. The stored energy is instantly converted to electricity
       and powers the critical load during utility disturbances or
       until a standby generator takes over. The power dense system,
       jointly developed by Caterpillar (NYSE:CAT) (www.cat.com) and
       Active Power (Nasdaq:ACPW) (www.activepower.com), provides
       highly reliable back-up power in a compact, efficient,
       low-maintenance package. Active Power's patented flywheel
       technology, CleanSource, is the world's first commercially
       viable mechanical battery.

WHO:   Caterpillar Dealer - Holt Power Systems, Inc. of
       Sacramento, CA, and Active Power, Inc. of Austin, TX cordially
       invite media, engineers and facility managers to attend this
       unique power quality event. Mission critical facilities, such
       as data centers, hospitals, manufacturers, and broadcasters can
       directly benefit from this proven flywheel technology.

WHY:   U.S. firms lose an estimated $30 billion dollars annually in
       both products and productivity due to power disturbances,
       according to the Electric Power Research Institute, Palo Alto,
       CA. Sags, glitches, brownouts and blackouts cannot be
       tolerated in the digital world, and more than ever,
       California's economy is dependent on highly reliable, quality
       power to protect critical facilities. Whether it's a hospital
       facility using a hundred kilowatts, or a data center with
       acres of servers consuming megawatts, quality power is
       essential for the highly sensitive, digital world.

WHEN:  Friday, Dec. 14, 2001
       Demonstrations at 11 a.m. and 1 p.m. Lunch at Noon.
       (Please RSVP.)

WHERE: 3850 Channel Dr. West Sacramento, CA. Directions: Take I-80,
       exit West Capitol Ave., go south on Enterprise and at the
       T-intersection turn left onto Channel Drive. Go one-half block
       to Holt on the left.

CALIFORNIA CUSTOMERS: VISA, Sun Microsystems, KEVA-TV, and other
high-tech companies, manufacturers, ISPs, government entities, are
using this power protection system to protect highly sensitive digital
equipment.

FYI: For digital images, go to
http://www.activepower.com/images/ups_graphic.jpg.

Cat UPS was named one of the most important 100 inventions by R&D
Magazine, and the system also awarded Plant Engineering Magazine's
"Product of the Year." Joe Pinkerton, inventor of the CleanSource
technology and CEO of Active Power has been honored recently with the
Ernst & Young Entrepreneur of the Year 2001 award.