Capstone MicroTurbine Fleet Surpasses 10 Million Operating Hours.

CHATSWORTH, Calif. -- Capstone Turbine Corporation(R) (www.microturbine.com) (Nasdaq:CPST) Chief Executive Officer John R. Tucker confirmed that the installed fleet of the company's Capstone MicroTurbine(R) energy systems has surpassed the 10-million-hour mark in documented runtime operation.

"In November of 2003, I reported that the installed base of our systems had accumulated an aggregate total of 5 million hours of documented operation," Tucker said. "Today, I'm proud to report that our product improvements and sales efforts have resulted in a doubling of that total in less than two years. This is a further testament to Capstone's commitment and leadership in microturbine technology."

Ten million hours is equivalent to more than 1,000 years worth of continuous operation, or an estimated 350,000 megawatt hours of clean, fuel-efficient Capstone MicroTurbine operation.

Each Capstone MicroTurbine system has an integrated power electronics package that maintains a log of runtime hours and operational performance data. "The 10-million-hour figure is the total documented operation of all installed units to which we have access or dial-in permission," said Tony Hynes, Capstone's Vice-President of Sales and Service. "The actual total runtime hours are certainly significantly higher."

In 1998, Capstone was the first to market a commercially viable microturbine energy product, selling its first three 30-kilowatt microturbine power systems in December of 1998. The company has sold in excess of 3,200 units since then.

"Some of our earliest systems installed to run 24/7 have been doing so almost continuously since 1999. There are units on the East Coast that have exceeded 40,000 hours each, and continue to perform," Hynes added.

"I'm especially proud that daily operation of Capstone MicroTurbines at facilities around the world not only help cut energy costs, they reduce pollutant emissions as well," Tucker said, citing US EPA test reports of Capstone MicroTurbines versus the US EPA's utility power plant emissions data. "In addition to 95 percent less smog-forming nitrogen oxides, a Capstone C60-ICHP is much more fuel efficient than conventional power and heat sources. That's even more important with today's rising fuel prices, and the increasing electricity costs that will surely follow. It's a great win-win overall, both for the folks that use our systems and for the communities where they operate."

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. The company has shipped more than 3,200 Capstone MicroTurbines to customers worldwide. These award-winning systems have logged more than 10 million runtime hours of documented operation. 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 company, Capstone Turbine is headquartered in the Los Angeles area with sales and/or service centers in New York, Milan 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 that early model operation will continue "going strong." 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.

Editors:

A publication-quality photo of two early Capstone systems that have exceeded 40,000 hours is at: http://www.microturbine.com/whatsnew/morePhotos.asp?newsid=376

Emissions data referenced above compares results of this test of a Capstone C60: http://www.epa.gov/etv/pdfs/vrvs/03_vr_capstone60.pdf with the national average utility power plant emissions reported here: http://www.epa.gov/cleanenergy/powerprofiler.htm

The fuel efficiency statement compares the 78% total (CHP) fuel efficiency of the Capstone C60 reported in the above test with the 33% national average efficiency of fossil-fueled utility power generation sited in this report: www.eia.doe.gov/cneaf/electricity/page/co2_report/co2report.html

Information on the US EPA Combined Heat and Power Partnership noted above is at: http://www.epa.gov/chp/chp_partners.htm