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SunPower Brings Solar Power to Microsoft's Mountain View Campus
480 Kilowatt Solar System is Largest in Silicon Valley

SUNNYVALE, Calif., Apr. 21, 2006  /PRNewswire/ -- SunPower Corporation (NASDAQ: SPWR), a Silicon Valley-based manufacturer of the world's highest efficiency, commercially available solar cells and solar panels, today announced the installation of its industry-leading solar panels in the largest commercial solar system in Silicon Valley at Microsoft's Mountain View, Calif., campus.

The 480 kilowatt solar power system converts sunlight directly into electricity to power a portion of the buildings and equipment on the Microsoft campus. SunPower's industry-leading, high-efficiency solar panels were integrated into the rooftop solar system designed and supplied by PowerLight, Corp. of Berkeley, Calif. SunPower's solar panels offer up to 50 percent more power per square foot than conventional solar technology, guaranteeing Microsoft the maximum power from their rooftop solar system.

"We congratulate Microsoft on the decision to SunPower its campus -- reducing its exposure to higher electric rates while lowering its carbon footprint," said Tom Werner, CEO of SunPower Corp. "We're pleased to have the largest solar system in Silicon Valley using Silicon Valley's own high-tech, high-efficiency SunPower solar panels."

SunPower's high-efficiency solar panels are available for homes and businesses across California. SunPower offers an all-black solar panel that improves the appearance of solar systems while maximizing the solar power generated per square foot of roof area.

About SunPower

SunPower Corporation designs and manufactures high-efficiency silicon solar cells and solar panels based on an all-back contact cell design. SunPower's solar cells and panels generate up to 50 percent more power per unit area than conventional solar technologies and have a uniquely attractive, all-black appearance. For more information on SunPower or solar technology, please visit the SunPower website at http://www.sunpowercorp.com/. SunPower is a majority-owned subsidiary of Cypress Semiconductor Corp. (NYSE: CY).

Forward Looking Statement

Statements made in this release that are not historical in nature and that refer to SunPower's plans and expectations for the future, are forward-looking statements made pursuant to the Private Securities Litigation Reform Act of 1995. We use words such as "estimates," "anticipates," "believes," "expects," "future," "look forward," "planning," "intends" and similar expressions to identify such forward-looking statements. Our actual results may differ materially due a variety of factors, including but not limited to the risks identified in our filings with the Securities and Exchange Commission. All forward-looking statements included in this release are based upon information available to SunPower as of the date of this release, which may change, and we assume no obligation to update any such forward-looking statement.

NOTE: SunPower is a registered trademark of SunPower Corporation. Cypress is a registered trademark of Cypress Semiconductor Corp. All other trademarks are the property of their respective owners.

SOURCE: SunPower Corporation

CONTACT: Julie Blunden, Vice President External Affairs,

Web site: http://www.sunpowercorp.com/