Management to Discuss Strategy to Capitalize on Emerging Trends in $8 Billion Global Critical Backup Power Market

AUSTIN, Texas (Nov. 5, 2009) – Critical backup power systems manufacturer Active Power, Inc. (NASDAQ: ACPW) has been invited to present at the Thomas Weisel Partners 2009 Alternative Energy and Natural Resources Conference to be held at the New York Palace Hotel, Nov. 10, 2009.

Active Power is scheduled to present on Tuesday, Nov. 10, 2009, at 4:25 p.m. (ET) with one-on-one meetings with management held throughout the day. The presentation will be available via Webcast here.

Jim Clishem, president and CEO at Active Power, will discuss trends emerging in the $8 billion global market for uninterruptible power supply (UPS) systems and the increasing need for energy and space efficient solutions to support mission critical operations. Clishem will also discuss the company’s largest order to date from a leading search engine provider and the increased market traction with its containerized power and cooling product offering.

For more information about the conference or to schedule a one-on-one meeting with Active Power, please contact your Thomas Weisel Partners representative or the corporate events desk at +1-415-364-2500.

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 datacenters, healthcare facilities, manufacturing plants, broadcast stations and governmental agencies in more than 40 countries. 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.