Rancho California Water District Dedicates 1.1-Megawatt SunPower Solar Power System

Rancho California Water District Dedicates 1.1-Megawatt SunPower Solar Power
System

Solar System Expected to Save District Up to $6.8 Million

MURRIETA, Calif., March 24 /PRNewswire-FirstCall/ -- Rancho California Water
District (RCWD) and SunPower Corp. (Nasdaq: SPWRA, SPWRB), a Silicon
Valley-based manufacturer of high-efficiency solar cells, solar panels, and
solar systems, today announced the completion of a 1.1-megawatt solar-electric
power system at the district's water treatment facility in Murrieta. The
system produces a portion of the facilities' electricity requirements, and is
expected to save the district up to $6.8 million in electricity costs over the
next 20 years.

In addition to designing and building the solar power system, SunPower also
financed the system under a SunPower Access power purchase agreement (PPA).
RCWD will buy electricity from SunPower at rates competitively priced against
utility rates, providing the district with a long-term hedge against rising
peak power prices. RCWD owns the renewable energy credits associated with the
system.

"The SunPower Access PPA made it financially possible for the district to
build this system, and reap the benefits of competitively-priced solar power
from day one," said Andy Webster, director of engineering for RCWD. "SunPower
offered high-efficiency technology that maximizes the amount of solar power
generated, and a turnkey solution that allowed the system to be operational in
eight months. It's good for our environment as well as for our residents and
businesses."

For the district, SunPower installed a system that utilizes SunPower solar
panels, the most efficient solar panels on the market today, with the SunPower
Tracker(R) system. The Tracker follows the sun's movement during the day,
increasing sunlight capture by up to 30 percent over conventional fixed-tilt
systems, while significantly reducing land use requirements. The system will
reduce more than 2.5 million pounds of carbon dioxide emissions annually,
which is equivalent to removing close to 202 cars from the road.

"Solar makes good financial sense today for California's water agencies. There
is financing available through power purchase agreements such as SunPower
Access, and there are also financial incentives for solar projects available
from state and federal governments," said Tom Werner, chief executive officer
of SunPower. "We applaud the district for hosting this showcase installation
that demonstrates both good environmental and fiscal stewardship."

About Rancho California Water District
Formed in 1965, Rancho California Water District supplies an area consisting
of approximately 150 square miles. The District serves the area known as
Temecula/Rancho California, which includes the City of Temecula, parts of
Murrieta, and other contiguous lands. The District is separated into two
divisions: the Santa Rosa Division generally west of I-15 and Rancho Division
generally east of I-15. The District currently provides sewer service to the
Cal Oaks and Bear Creek areas.

About SunPower
SunPower Corp. (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.

Forward-Looking Statements
This press release contains forward-looking statements within the meaning of
the Private Securities Litigation Reform Act of 1995. Forward-looking
statements are statements that do not represent historical facts and may be
based on underlying assumptions. The company uses words and phrases such as
"expected," and "will," to identify forward-looking statements in this press
release, including forward-looking statements regarding: (a) the system
saving the district up to $6.8 million in electricity costs over the next 20
years; (b) the district buying electricity at rates competitively priced
against utility rates, providing the district with a long-term hedge against
rising peak power prices; (c) the system reducing more than 2.5 million pounds
of carbon dioxide emissions annually, which is equivalent to removing close to
202 cars from the road. Such forward-looking statements are based on
information available to the company as of the date of this release and
involve a number of risks and uncertainties, some beyond the company's
control, that could cause actual results to differ materially from those
anticipated by these forward-looking statements, including risks and
uncertainties such as: (i) actual electricity generation; (ii) the actual
energy consumption rate; (iii) unexpected changes in utility service rates;
(iv) variations in carbon dioxide emissions reductions; and (v) other risks
described in the company's Annual Report on Form 10-K for the year ended
December 28, 2008, and other filings with the Securities and Exchange
Commission. These forward-looking statements should not be relied upon as
representing the company's views as of any subsequent date, and the company is
under no obligation to, and expressly disclaims any responsibility to, update
or alter its forward-looking statements, whether as a result of new
information, future events or otherwise.

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

SOURCE SunPower Corporation

Ingrid Ekstrom of SunPower Corporation, +1-510-260-8368,
iekstrom@sunpowercorp.com; or Meggan Reed of Rancho California Water District,
+1-951-296-6922, ReedM@RanchoWater.com