SunPower Corporation
May 18, 2009

SunPower Announces Industry's Only Solar Monitoring Application for the Apple iPhone and iPod touch Mobile Devices

--Homeowners Now Have Three Ways to Easily Monitor the Efficiency of Their SunPower Solar Rooftop System

SAN JOSE, Calif., May 18, 2009 /PRNewswire-FirstCall via COMTEX News Network/ -- SunPower Corp. (Nasdaq: SPWRA, SPWRB), a manufacturer of high efficiency solar cells, solar panels and solar systems, today announced the industry's first monitoring application for the Apple iPhone(TM) and iPod touch(R) mobile devices. With the addition of this application to the SunPower(R) Monitoring System, a suite of monitoring services, residential customers now have three easy ways to access information about the energy generated by their SunPower solar systems.

Along with the iPhone and iPod touch application, the SunPower Monitoring System offers homeowners the ability to monitor SunPower solar systems with a wireless, in-home wall-mounted LCD display that provides power production and cumulative energy information. The monitoring system also provides the convenience of Internet access to a solar system's performance from virtually anywhere. Customers can view a system's energy performance and environmental savings on an hourly, monthly and annual basis.

"With the SunPower Monitoring System, our customers can optimize their solar investment and save on energy expenses," said Jan Soderstrom, vice president and chief marketing officer at SunPower Corp. "By monitoring their solar systems online, in-home or via their Apple mobile devices, these tools empower homeowners to track their systems anytime and from practically any location."

The iPhone and iPod touch application can be downloaded immediately from the Apple App Store at itunes.com/apps/sunpowermonitoring at no charge and is available to new and existing customers of SunPower solar systems with monitoring capabilities. Prospective customers can download a demonstration feature with an overview of how the application works. The SunPower Monitoring System is available through the SunPower dealer network for homeowners purchasing a new solar rooftop system. Customers in new home communities with SunPower solar can monitor their systems via the online and Apple mobile device application services.

About SunPower

SunPower Corporation (Nasdaq: SPWRA, SPWRB) designs, manufactures and delivers high-performance solar electric systems worldwide for residential, commercial and utility-scale power plant customers. SunPower high-efficiency solar cells and solar panels generate up to 50 percent more power than conventional solar technologies and have a uniquely attractive, all-black appearance. With headquarters in San Jose, Calif., SunPower has offices in North America, Europe, Australia, and Asia. For more information, visit www.sunpowercorp.com.

SunPower is a registered trademark of SunPower Corp. All other trademarks are the property of their respective owners.

SOURCE SunPower Corporation

http://www.sunpowercorp.com

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