SunPower Completes Sale of 44-Megawatt Montalto di Castro Solar Park

SAN JOSE, California, December 27, 2010 - SunPower Corp. (Nasdaq: SPWRA, SPWRB) today announced that it has
completed the sale of its 44-megawatt (MW) Montalto di Castro solar park to a
consortium of international investors that include MetLife, Fondo PPP Italia
(managed by Fondaco SGR S.p.A and advised by Equiter S.p.A) and Voigt &
Collegen (with its funds SolEs 22 and SolEs 23). SunPower designed and built
the solar power plant and will provide ongoing operations and maintenance
services for the new owners. Barclays Capital advised MetLife on this
transaction.

"With the sale of this power plant now completed, we have met the goal of
developing, constructing and monetizing 72 megawatts from the Montalto di
Castro solar park," said Dennis Arriola, SunPower chief financial officer.
"We are proud of this accomplishment and recognize the dedicated team and
various independent parties that helped to deliver this successful outcome."

The Montalto di Castro solar park, developed by SunPower, is located in
the Lazio region of Italy near Rome, where the 20-MW first phase was
connected to the grid in November of 2009, several weeks ahead of schedule.
The 8-MW second phase was commissioned earlier this fall, and the third and
fourth phases, totaling 44 MW, were completed earlier this month. SunPower
financed the development and construction of the 44-MW with proceeds from the
solar industry's first-of-its-kind solar bond.

Editors' Note: The capacity of power plants in this release is described
in approximate megawatts on an alternating current (AC) basis unless
otherwise noted. On a direct current (DC) basis, the final two phases of the
Montalto di Castro solar park total approximately 51 MW in capacity and form
part of a multi-phase solar park with a capacity of approximately 85 MW (DC).

About SunPower

Founded in 1985, 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.

Media, Helen Kendrick, +1-408-240-5585, hkendrick at sunpowercorp.com, or Investors, Bob Okunski, +1-408-240-5447, Bokunski at sunpowercorp.com, both of SunPower Corp.