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SunPower E20/327 Solar Panels Earn Unprecedented Rating for Reliability after Completing the Atlas 25+ Program
Outstanding Results of Less than Two Percent Power Drop Across all Tests


SAN JOSE, Calif., June 25, 2013 /PRNewswire/ -- SunPower Corp. (NASDAQ: SPWR), a leading solar technology and energy services company, and Atlas Material Testing Technology, LLC (Atlas), the global leader in weathering technology and services, today announced that the high-efficiency SunPower® E20/327 Solar Panel underwent the rigorous Atlas 25+® Comprehensive PV Durability Testing program and, upon completion, showed less than two percent power degradation, an outstanding result for the program.  The certificate was issued by Atlas' partner, SGS, the world's leading inspection, verification, testing and certification company.

The Atlas 25+ testing protocol includes long-term environmental exposure that requires modules to have less than eight percent degradation over the testing period in order to receive SGS certification.  The program is designed to subject modules to the environmental degradation stresses which can be expected over long-term service.  In addition to achieving less than two percent power loss, the SunPower E20/327 Solar Panel also passed two additional criteria:  no visual aesthetic changes and no change in electro-luminescence.

"Our Atlas 25+ third-party testing program replicates harsh weather conditions that solar panels will undergo during their lifetime," said Richard Slomko, Global Testing Manager at Atlas Testing Services.  "We are pleased that SunPower's high efficiency solar panels not only withstood these conditions, but well exceeded the power degradation criteria of eight percent in addition to testing well on all criteria.  We are delighted that SunPower has received outstanding results from our Atlas 25+ program."

Atlas 25+ is a proprietary multi-dimensional durability test program designed to subject photovoltaic modules to the environmental degradation stresses which can be expected over long-term service. It provides manufacturers with the data they need to demonstrate long-term durability and to support warranty and performance claims while reducing the costs associated with aftermarket product failure. The program exposes solar panels to a series of stresses, including UV-A/UV-B exposure, salt spray corrosion, condensing humidity, solar/thermal humidity cycle, solar/thermal humidity freeze cycle, Arizona and Florida solar tracking – including peak summer – and initial, final and multiple interval measurements. 

"SunPower produces the most reliable solar panels. The results of the demanding Atlas 25+ testing criteria confirm our position," said Tom Werner, SunPower president and CEO.  "We want to provide our customers with third-party validation of the efficiency and reliability of our solar technology. We are pleased and honored to be the only solar company to date to receive this test's highest rating."

About SunPower
SunPower Corp. (NASDAQ: SPWR) 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, Africa and Asia. For more information, visit www.SunPowercorp.com.

About Atlas Material Testing Technology
Atlas is a recognized leader in material testing, offering a complete line of instruments and services for accelerated and natural weathering. In addition, the Atlas Consulting Group helps clients from various industries including photovoltaics, coatings, plastics, textiles, automotive and cosmetics develop the best weathering processes for their products.

In November 2010, Atlas joined AMETEK, Inc., a global leader in electronic instruments and electromechanical devices, as a unit of AMETEK Measurement & Calibration Technologies (M&CT). AMETEK M&CT is a division within AMETEK's Electronic Instruments Group (EIG), a recognized leader in advanced monitoring, testing, calibrating and display instruments.

Atlas Material Testing Technology is ISO 17025 and ISO 9001:2008 registered. Atlas products are designed and manufactured to conform to international, national and industry standard test methods including ISO, ASTM, DIN, JIS and numerous others.

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

SOURCE SunPower Corp.

For further information: Helen Kendrick, SunPower Corp., +1-408-240-5585, Helen.Kendrick@sunpowercorp.com or Stefani Levine, Atlas Material Testing Technology, LLC, +1-773-289-5533, Stefani.Levine@ametek.com