Capstone MicroTurbine Fleet Surpasses 15 Million Operating Hours

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CHATSWORTH, Calif.--

Capstone Turbine Corporation(R) (www.microturbine.com) (NASDAQ:CPST) President and Chief Executive Officer Darren R. Jamison confirmed today that the installed fleet of the company's Capstone MicroTurbine(TM) energy systems has surpassed the 15 million-hour mark in documented runtime operation.

"In September 2005, we had reported that the installed base of our systems had accumulated an aggregate total of 10 million hours of documented operation," Jamison said. "I am pleased to report this significant new milestone in microturbine achievement. Accumulating an aggregate total of 5 million hours of documented operation in just 18 months is a testament to Capstone's commitment and leadership in this technology."

Fifteen million hours is equivalent to approximately 1,710 years worth of continuous operation. Each Capstone MicroTurbine system has integrated power electronics that maintain a log of runtime hours and operational performance data. "The 15 million-hour figure represents the total documented operation of installed units with which we have contact or dial-in permission," said Shelby Ahmann, Capstone's senior vice president of Customer Service.

Jamison also announced that the company recently shipped its 4,000th unit and also has achieved significant Mean Time Between Failure (MTBF) reliability criteria as follows:

    --  MTBF of greater than 8,000 hours for the C60 Series; and

    --  MTBF of greater than 15,000 hours for the C30

"John Fox, product manager for UTC Power, a United Technologies Corp. (NYSE:UTX) company, reports that UTC Power's fleet of combined cooling, heating and power systems utilizing Capstone MicroTurbines is performing at an MTBF above 10,000 hours. We are pleased with the quality and reliability of our PureComfort(R) systems in the field," Fox said. "We're gaining a lot of experience in diverse locations and this milestone demonstrates the soundness of the technology."

"It's impressive when you think that our C60 Series will run on average one year between documented failures and our C30 almost twice that long. This is extremely impressive when compared to the failure rates of other incumbent technologies and really makes Capstone the right solution for unmanned sites below 2 megawatts," Ahmann added.

"I am particularly proud that Capstone MicroTurbines are green and clean energy solutions. They not only can help cut net energy costs at a wide variety of businesses and public facilities, but also do so with a positive impact on air quality by reducing pollutant emissions as well," Jamison said.

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. 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.

About UTC Power

United Technologies Corp., based in Hartford, Connecticut, provides high-technology products and services to the building and aerospace industries. Its UTC Power unit, based in South Windsor, Connecticut, is a full-service provider of environmentally advanced power solutions. With nearly 50 years of experience, UTC Power is a world leader in developing and producing fuel cells for on-site power, transportation, space and defense applications, and a developer of innovative combined cooling, heating and power applications for the distributed energy market.

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

Source: Capstone Turbine Corporation

Released May 2, 2007