Active Power (NASDAQ: ACPW), manufacturer of continuous power and infrastructure solutions has been selected as a Technology Fast 500? award winner for 2011 by Deloitte. The company was selected for the award based on its percentage of fiscal year revenue growth from 2006 to 2010, recording a 160 percent increase during this time period.

The award program sponsored by Deloitte provides a ranking of the fastest growing technology, media, telecommunications, life sciences, and clean technology companies in North America.

"Active Power and the other 2011 Technology Fast 500? winners have demonstrated the ability to turn innovation into spectacular growth, even against the backdrop of a challenging economy," said Amy Chronis, managing partner, Central Texas, at Deloitte. "Deloitte commends Active Power for this remarkable accomplishment."

"Our inclusion in the Deloitte Technology Fast 500 is a testament to the strides we've made in a number of areas including strengthening our brand worldwide, creating innovative products and solutions, and diversifying our sales and distribution channels," said Jan Lindelow, interim president and CEO, at Active Power. "This achievement reflects the support of our customers, distributors, and strategic partners as well as the hard work and commitment from the Active Power team."

For additional detail on the Technology Fast 500? including selection and qualifying criteria, visit www.fast500.com.

About Active Power

Founded in 1992, Active Power (NASDAQ: ACPW) designs and manufactures continuous power solutions and critical backup power systems that enable datacenters and other mission critical operations to remain 'on' 24 hours a day, seven days a week. Active Power solutions are intelligently efficient, inherently reliable and economically green, providing environmental benefits and energy and space efficiencies to customers' financial benefit. The company's products and solutions are built with pride in Austin, Texas, at a state-of-the-art, ISO 9001:2008 registered manufacturing and test facility. Global customers are served via Austin and three regional operations centers located in the United Kingdom, Germany, and China, supporting the deployment of systems in more than 40 countries. For more information, 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 and CleanSource are registered trademarks of Active Power, Inc. The Active Power logo and PowerHouse are trademarks of Active Power, Inc. All other trademarks are the properties of their respective companies.

Active Power
Investor Contact:
Liolios Group
Ron Both, 949-574-3860
ron@liolios.com
or
Media Contact:
Lee Higgins, 512-744-9488
Senior Public Relations Manager
lhiggins@activepower.com