SunPower Sets New World Record for Efficiency

SAN JOSE, Calif., June 8, 2011 /PRNewswire/ -- SunPower Corp. (NASDAQ: SPWRA, SPWRB) today launched the SunPower™ E20 series of solar panels, the industry's first commercially-available solar panels to achieve total area efficiencies of 20 percent or more.

The new 96-cell E20 solar panels are available in 333-watt and 327-watt models for rooftop installations and feature SunPower's 22.4 percent efficient patented Maxeon™ cell technology. The all-back contact Maxeon solar cell captures significantly more sunlight and conducts more electrical current than conventional solar cells, and holds the world record for efficiency among commercially available, mass-produced solar cells.

Customers will also benefit from two new features offered by the E20 series: positive power tolerance rating and comprehensive inverter compatibility.

• The positive power tolerance rating ensures that the power generated by each panel meets that panel's rating, or up to five percent more – but not less, as is common in the industry.
• With comprehensive inverter compatibility, SunPower customers now have the flexibility to use the highest performing transformer-less inverters to maximize system output. Transformer-less inverters are light-weight, easy to install and cost-effective.

"With the E20 series solar panels, SunPower has once again broken a world record for efficiency," said SunPower CEO Tom Werner. "SunPower consistently delivers the most efficient and reliable solar technology on the market, guaranteed to deliver the greatest return on investment to our customers."

The prototype for the E20 was successfully developed using funds provided by the U.S. Department of Energy (DOE) under its Solar America Initiative, which was awarded to SunPower approximately four years ago. The E20 efficiency rating was confirmed by the DOE's National Renewable Energy Lab.

SunPower's E20 series solar panels will be offered in Europe and Australia this year, with availability extended in North America and Asia in early 2012.

About SunPower

SunPower Corp. (Nasdaq: SPWRA, SPWRB) designs, manufactures and delivers the highest efficiency, highest reliability solar panels and systems available today. Residential, business, government and utility customers rely on the company's quarter century of experience and guaranteed performance to provide maximum return on investment throughout the life of the solar system. Headquartered 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.

SOURCE SunPower Corp.