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SunPower Expands its Line of High-Efficiency Inverters
New Offerings Provide Choice in Design and Monitoring Capabilities
SAN JOSE, Calif.

SAN JOSE, Calif., Jul. 26, 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 it has expanded its line of high-efficiency inverters, providing a choice in both design and monitoring capabilities. The new inverters and inverter monitors will be offered to the company's North American customers, as part of a complete, integrated solar system solution.

SunPower's SPRx inverters include: SPR-3300x, SPR-3300x -- 208 and SPR- 4000x, with a maximum AC power output from 3,300 watts to 4,000 watts. These highly reliable inverters are compatible with the electrical specifications of each of the company's high-efficiency solar panels, resulting in maximum system energy production. They also feature a low installed cost and clean design, and carry SunPower's 10-year warranty as a standard feature. The inverters are developed and manufactured for SunPower by Xantrex, a world leading supplier of high-quality solar inverters and monitoring systems for residential and commercial markets.

Complementing the company's new line of inverters is SunPower's SPRx Inverter Monitor for use inside the home to keep track of the superior efficiency delivered by SunPower's solar systems. The monitor easily connects to the SPRx series inverters using standard off-the-shelf CAT 5 Ethernet cable, and features a graphical, backlit LCD screen to monitor a single or multi-inverter PV system in one convenient indoor location.

"We are pleased to improve our customers' experience by offering an easy way to track SunPower's superior performance with our SPRx Inverter Monitor," said Peter Aschenbrenner, vice president of marketing and sales for SunPower Corp. "Customers are proud of their high-efficiency, beautifully designed SunPower systems, and this monitoring system offers them a way to show their friends what's happening up on the roof."

SunPower's SPRx High Efficiency Inverters and SPRx Inverter Monitors are now available. All product information can be found on the company's web site at www.sunpowercorp.com.

About SunPower

SunPower Corp. 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).

About Xantrex

Xantrex Technology Inc. (www.xantrex.com) is a world leader in the development, manufacturing and marketing of advanced power electronic products and systems for the renewable, portable, mobile, and programmable power markets. The company's products convert and control raw electrical power from any central, distributed, renewable, or backup power source into high-quality power required by electronic and electrical equipment. Headquartered in Vancouver, British Columbia, the company has facilities in Arlington, Washington; Livermore, California; Elkhart, Indiana; Barcelona, Spain; and Reading, England. Xantrex is publicly listed on the Toronto Stock Exchange under the ticker symbol "XTX".

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 Corp. 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/