The World's Largest Solar Electric Power Plant featuring SunPower's High-Performance A-300 Solar Cells

SUNNYVALE , Calif., May 31, 2005 - SunPower Corp., a Silicon Valley-based subsidiary of Cypress Semiconductor Corp. (NYSE: CY), today announced that SOLON AG (WKN 747119/ISIN DE0007471195, Frankfurt Stock Exchange/Xetra: SOO1) , Germany's largest solar photovoltaic module manufacturer, has opened Phase One of the world's largest solar electric plant in Bavaria near Arnstein, Germany. Solarpark Gut Erlasse is a 12 MW solar electric plant located in a working agricultural field and can serve the electricity needs of thousands of customers each year.

SunPower's solar cells are used in SOLON's "Mover" electricity generation system, designed for deployment in multi-megawatt solar power plants. Movers automatically tilt and rotate during the day to directly face the sun at all times. By combining SunPower's industry-leading, high-performance A-300 solar cells with the Mover's ability to maximize daily energy production, each square foot of solar cells can generate up to double the annual energy of a fixed solar array using conventional solar cells. At Solarpark Gut Erlasse, SunPower's cells are used in about one-third of the Movers, but generate a higher proportion of the energy at the Solarpark, due to their exceptional performance. Information about the SOLON Mover is available at http://www.solonmover.com.

Alex Voigt, SOLON's CEO said, "We are very pleased to open Phase One of Solarpark Gut Erlasse. SunPower's solar cells are the most efficient on the market today, and allow us to generate between 30-50 percent more power per mover, compared with conventional solar cells. Our goal with the Mover program was to develop a truly industrial solar power system. Our recently announced $300 million, five-year purchase agreement with SunPower for their high-performance cells, provides SOLON with the supply security and visibility necessary for us to address the rapidly growing market for megawatt-scale solar power plants."

Tom Werner, SunPower's CEO said, "We congratulate SOLON and all of the investors in Solarpark Gut Erlasse for forging a new path for solar energy's role in our energy supply. SOLON's Mover is an ideal application for SunPower's high-performance solar cell technology. As Europe's largest module manufacturer, SOLON is well known and highly respected for its innovative technical solutions and high-quality products. We are pleased to be a core supplier to the Mover program."

Photo:

A picture of the SOLON Solarpark Gut Erlasse can be downloaded from: http://www.cypress.com/solonsolarpark.

About SOLON

SOLON was the first solar stock traded on German Stock Exchanges in the year 1998. It is the largest producer of PV modules in Germany with an annual production capacity of more than 90 MWp and one of country's leading suppliers of high-quality solar solutions. Its products include its new SOLON-Mover double-axial solar tracking system and a variety of PV modules ranging in power from 120 to 850 watts.

About SunPower

SunPower—a Silicon Valley-based majority-owned subsidiary of Cypress Semiconductor Corp. (NYSE: CY)—designs and manufactures ultra-high efficiency silicon solar cells and modules based on an all-back-contact design. SunPower's solar cells and modules generate up to 50 percent more power per square foot 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.

About Cypress

Cypress solutions are at the heart of any system that is built to perform: consumer, computation, data communications, automotive, industrial, and solar power. Leveraging a strong commitment to customer service and performance-based process and manufacturing expertise, Cypress's product portfolio includes a broad selection of wired and wireless USB devices, CMOS image sensors, timing solutions, network search engines, specialty memories, high-bandwidth synchronous and micropower memory products, optical solutions, and reconfigurable mixed-signal arrays. Cypress stock is traded on the New York Stock Exchange under the ticker symbol CY. More information about the company is available online at www.cypress.com.