Capstone Model C65 MicroTurbine Systems Receive Latest Certification for UL 1741 Interconnection Standards

CHATSWORTH, Calif.--

Capstone Turbine Corporation(R) (www.microturbine.com) (NASDAQ:CPST), the world's leading manufacturer of microturbine energy systems, today announced that its Model C65 kW MicroTurbine(TM) systems are the first microturbines to be certified by Underwriters Laboratories Inc. (UL) to the latest UL 1741 interconnection standards that became effective May 7, 2007.

The standard, UL 1741, Inverters, Converters, Controllers, and Interconnection Systems for use with Distributed Energy Resources was revised on November 7, 2005 to incorporate the updated requirements of the July 2005 revision of the international standard IEEE 1547.1 Standard Conformance Test Procedures for Equipment Interconnecting Distributed Resources with Electric Power Systems. In order to comply with this standard, a rigorous battery of tests was conducted to ensure that the Capstone inverter technology meets power quality, protective relay, lightning strike and safety requirements.

Statewide utility interconnection requirements, including California Rule 21 and New York State Public Service Commission rules, have adopted the UL 1741 standard. The UL 1741 standard facilitates customer installation of Capstone MicroTurbines in targeted regions such as California and New York.

"I am pleased with the accomplishment our engineering team has achieved being the first microturbine manufacturer to meet the new revised requirements of the UL 1741 standard," said Mark Gilbreth, Executive Vice President and Chief Technology Officer. "It is important that our engineering resources are focused on initiatives that satisfy marketplace requirements in order that our products remain the most attractive technology for our customers."

"I am proud of this achievement to meet UL's high testing standards. Capstone will continue to work to find ways to better enable the installation of our microturbines and increase the adoption rate of our clean and reliable distributed generation technology," added Darren Jamison, President and CEO of Capstone Turbine Corporation.

About Capstone Turbine

Capstone Turbine Corporation (www.microturbine.com) (NASDAQ:CPST) is the world's leading producer of low-emission microturbine systems, and was the first to market commercially viable microturbine energy products. Capstone Turbine has shipped thousands of Capstone MicroTurbine(TM) systems to customers worldwide. These award-winning systems have logged millions of documented runtime operating hours. Capstone Turbine is a member of the U.S. Environmental Protection Agency's Combined Heat and Power Partnership, which is committed to improving the efficiency of the nation's energy infrastructure and reducing emissions of pollutants and greenhouse gases. A UL-Certified ISO 9001:2000 certified company; Capstone Turbine is headquartered in the Los Angeles area with sales and/or service centers in New York, Mexico City, Milan, Nottingham, Shanghai and Tokyo.

"Capstone Turbine Corporation" and "Capstone MicroTurbine" are registered trademarks of Capstone Turbine Corporation. All other trademarks mentioned are the property of their respective owners.

This press release contains "forward-looking statements," as that term is used in the federal securities laws, about Capstone's business, with regard to, among other items, expectations of market acceptance of new product standards. Forward-looking statements may be identified by words such as "expect," "believe" and similar phrases. These statements are subject to numerous assumptions, risks and uncertainties that may cause Capstone's actual results to be materially different. These statements speak only as of the date of this release. Capstone disclaims any obligation to revise these statements hereafter.

Source: Capstone Turbine Corporation

Released May 17, 2007