Capstone Turbine Announces National Sales Representative Agreement with WESCO.

CHATSWORTH, Calif. -- Capstone Turbine Corporation(R) (www.microturbine.com) (Nasdaq:CPST), the world's leading manufacturer of microturbine energy systems, today announced the signing of a National Sales Representative Agreement with WESCO(R) Distribution, Inc., (www.wescodist.com) the primary operating entity for Pittsburgh-based WESCO International, Inc. (NYSE:WCC).

"This agreement opens the door for a myriad of new sales opportunities for Capstone, because WESCO provides a highly knowledgeable sales team that will expand our reach geographically. Even more importantly, they will provide 'feet on the street' that are essential to improving adoption of our products," said John Tucker, Capstone's Chief Executive Officer.

"Consummation of this agreement is the first of a number of initiatives we expect to announce in the near future, all aimed at accomplishing our strategic objectives, and enhancing value for both customers and shareholders," he said.

WESCO Distribution, Inc. is a leading distributor of electrical construction products and electrical and industrial maintenance, repair and operating (MRO) supplies, and is the nation's largest provider of integrated supply services with 2004 annual product sales of approximately $3.7 billion. The Company employs approximately 5,350 people, maintains relationships with 24,000 suppliers, and serves more than 100,000 customers worldwide. Major markets include commercial and industrial firms, contractors, government agencies, educational institutions, telecommunications businesses and utilities. WESCO operates five fully automated distribution centers and approximately 350 full-service branches in North America and selected international markets, providing a local presence for area customers and a global network to serve multi-location businesses and multi-national corporations.

The National Sales Representative Agreement between Capstone and WESCO Distribution was signed to enhance the sale of Capstone MicroTurbine(R) energy systems.

"This arrangement offers Capstone the opportunity to strategically leverage WESCO's broad capabilities throughout the country," said Tucker. "Their expertise and knowledge in electrical systems and components will be a great addition to complement Capstone's strategic sales growth initiatives. This will be particularly beneficial in markets where the installation of onsite distributed generation and combined heat and power (CHP) is needed."

Tucker continued, "The talented and professional sales force of WESCO brings to us exactly the capabilities we have been seeking to augment our sales efforts. WESCO's broad geographic and commercial presence enhances the opportunity for improved sales growth for Capstone MicroTurbines. In particular we anticipate WESCO can create a positive impact for Capstone in large corporate account arenas, such as hotels, apartments and condominiums, and commercial and industrial properties."

About Capstone Turbine

Capstone Turbine Corporation (www.microturbine.com)(Nasdaq:CPST) is the world's leading producer of low-emission microturbine systems. In 1998, Capstone was the first to offer commercial energy products utilizing microturbine technology, the result of more than ten years of focused research. Capstone Turbine has shipped more than 3,000 Capstone MicroTurbine systems to customers worldwide. These award-winning systems have logged more than 9 million hours of documented operation. An ISO 9001:2000 certified 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 of benefits from the Agreement entered into between Capstone and WESCO. 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:

Spec sheets on Capstone MicroTurbine models are at: www.microturbine.com/technology/specsheets.asp

Some example case studies are at: www.microturbine.com/onsite