SunPower's High Efficiency Solar Panels Power Winning Teams at the Solar Decathlon Europe

University of Rosenheim Takes Second Place

MADRID, June 28, 2010 - SunPower Corp. (Nasdaq: SPWRA, SPWRB) announced today that the team of
students representing the University of Rosenheim, Germany at the 2010 Solar
Decathlon Europe has placed second, using high-performance SunPower solar
panels to power the home they built for the competition. The school also took
top honors in the Energy Balance competition. SunPower solar panels were used
by first place teams in the last three Solar Decathlon competitions held in
the U.S.

The Solar Decathlon Europe, organized by the Spanish Ministry of Housing,
is modeled after the Solar Decathlon that is held by the U.S. Department of
Energy in Washington, D.C. every two years. From June 18 to June 27, this
year's Decathlon hosted 17 teams from three continents, challenging students
to design, build and operate solar-powered houses that are cost-effective,
energy-efficient and attractive. Six participating teams used SunPower
panels, the most efficient solar panels available on the market today.

Several of the teams using SunPower panels placed first in the individual
categories that comprise the competition. For example, the University of
Paris Arts et Metiers led the field in the Sustainability competition with
the all-black, 96-cell, SunPower 315 Solar Panel. Spain's University of CEU
Cardenal Herrera, using the SunPower 225 Solar Panel, won first prize in the
category of Industrialization and Viability. The University of Florida, using
the SunPower 230 Solar Panel, took top honors in the Communication and Social
Awareness competition, and was also awarded Public and Web Favorite.

"We congratulate the University of Rosenheim for a strong finish, and all
of the teams for their hard work, innovative design and commitment to
sustainability," said Luis Torres, general director of market development,
EMEA at SunPower. "This first Solar Decathlon Europe was also the first in
which all teams were connected to the grid, following the design of European
markets and emphasizing self-consumption in homes. We congratulate the Solar
Decathlon organizational team and the Spanish Ministry of Housing for a very
successful event."

About SunPower

Celebrating its 25th anniversary this year, SunPower Corp. (Nasdaq:
SPWRA, SPWRB) designs, manufactures and delivers the planet's most powerful
solar technology broadly available today. Residential, business, government
and utility customers rely on the company's experience and proven results to
maximize return on investment. 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.

Christelle Huwiler of SunPower Corp., +41-22-304-15-93, Christelle.Huwiler at sunpowercorp.com; or Ana Martin-Cleto, +34-610-53-27-47, Ana.Martincleto at ogilvy.com, for SunPower Corp.