1. SunPower advantages Leszek Pstras Applications Engineer, UK © 2012 SunPower Corporation

2.  EFFICIENCY  World record – 20% efficiency !  PERFORMANCE  more kWh per kWp  RELIABILITY  designed and tested for long life in real world 2 SUNPOWER ADVANTAGES

3. 3 EFFICIENCY PERFORMANCE RELIABILITY

4. SunPower Maxeon TM cell SunPower’s all-back contact solar cells vs. conventional c-si cells. A different technology built on a robust and proven monocrystalline substrate Poly-Si efficiency 14-17% Mono-Si conventional efficiency 16-19% SunPower cell efficiency: 23-24.2% 4

5. 5

6. 6

7. 7 EFFICIENCY PERFORMANCE RELIABILITY

8. 8 SunPower Energy Performance Independent tests show that SunPower modules provide superior energy performance (kWhs/kWp) at sites throughout the world University of Cyprus 4% more than HIT (Sanyo) 7% more than CdTe (First Solar) 6% more than c-Si (Av. of 4) 8% more than a-Si (Mitsubishi) 3 yrs of data – Jun 06 to Jul 09 CREST 1% more than HIT (Sanyo) 9% more than c-Si 1 yr of data – Apr 07 to Apr 08 ASU 7% more than c-Si * Data from summer 2008 University of Stuttgart (IPE) 7% more than HIT (Sanyo) 6% more than CdTe (First Solar) 7% more than c-Si (Av. of 4) 9% more than a-Si (Schott Solar) 3 yrs of data – Jun 06 to Jul 09

9. PHOTON LABORATORY (www.photon.info/laboratory)www.photon.info/laboratory  Aachen, Germany (orientation: South, tilt: 28 o )  Over 170 types of modules tested  Yield at module level! SU SUNPOWER RESULTS  Top performing modules!  +7 % vs crystalline Silicon average  +9% vs thin film avg, +13% vs ribbon avg 9

10. Source: Photon International 2008 No Light Induced Degradation 10

11. 11 Extremely low degradation rate

12. 12 Broad spectral response SunPower cells capture more light from the blue and infra-red parts of the spectrum through lightly doped front surface and light-trapping.

13. 13  Voltage builds rapidly at low insolation levels  Better performance in overcast conditions  Inverter wakes up earlier and runs longer Better low light performance SunPower SPR-90 Mono Crystalline Silicon Poly Crystalline Silicon CuInSe 2 Amorphous Silicon SunPower solar cells generate more power at low light levels relative to other technologies

14. 14 Lower operating temperature High efficiency modules operate at lower temperatures since they convert more light to electricity (lower efficiency modules convert more light to heat instead)

15. Higher Performance at Higher Temperatures 15 Due to lower temperature coefficients and lower normal cell operating temperatures (NOCT), SunPower panels generate more energy at higher temperatures compared to standard c-Si modules Temp Coefficient: SunPower-0.38% / °C Std c-Si -0.47% / °C NOCT: SunPower45 °C +/-2 Std c-Si 47 °C +/-2 0 5 10 15 20 25 30 35 40 (C°)

16. Performance ratio shows how the modules behave under real conditions (compared to STC). It reflects modules efficiency across the whole irradiance range, spectral sensitivity over all wavelenghts as well as temperature effects. 16 Source: Photon Lab test results (Jan – Sept 2012) Bottom line → high performance ratio!

17. 17 EFFICIENCY PERFORMANCE RELIABILITY

18. 18 SunPower extended testing for highest reliability 7x IEC 5x UL 12x ISO Basic industry certification SunPower custom tests Higher certification level Highly Accelerated Life Tests (HALT) Design and manufacturing tests

19. Demonstration: Breaking Cell SunPower cells are flexible – even when broken, they are still fully functional Conventional cells are stiff and prone to shattering – once broken, become dead SunPower Cell Conventional Cell 19

20. Vertical integration: from silicon to system Solar grade silicon Ingot Wafer Cell Module Installation Recycling 20

21. SunPower Continues to Deliver in Warm, Humid Conditions while Conventional Panels Lose Power Certification Standard 1000 hours Certification Standard 1000 hours Sources: Front contact manufacturers in Fraunhofer ISE and TUV Rheinland tests; Koehl, Michael, et. al. “PV Reliability: Accelerated Aging Tests and Modeling of Degradation.” Presented at EUPVSEC, Valencia Spain, Sept 2010. *Added SunPower results for the same test run by SunPower SunPower® Maxeon™ Cell Technology Conventional Front Contact Solar Thick plated copper is robust and withstands corrosion to deliver consistent power even in humid conditions Thin baked on metal corrodes easily resulting in broken connections that lead to power loss in humid conditions 21

22. SunPower Stands Up to Temperature Variations while Conventional Panels Lose Power Sources: Front contact manufacturers in Fraunhofer ISE and TUV Rheinland tests; Koehl, Michael, et. al. “PV Reliability: Accelerated Aging Tests and Modeling of Degradation.” Presented at EUPVSEC, Valencia Spain, Sept 2010. *Added SunPower results for the same test run by SunPower SunPower® Maxeon™ Cell Technology Conventional Front Contact Solar Thick, flexible copper contacts and built in strain relief withstands expansion and contraction caused by temperature swings resulting in consistent power Thin baked on metal and no strain relief result in broken connections due to temperature swings which lead to power loss 22

23. Competitor Power Loss = 2.1% SunPower Power Loss = 0% Dynamic Load Test Results Electroluminescence images of a front-contact module and SunPower back contact module after dynamic load HALT stress (1000 cycles of +/-2400 Pa, equivalent to maximum wind load, of alternating pressure load on the glass) 23

24. Combined 25-year power and product warranty !!! 24 9,1% Additional Power! 0% degradation for the first five years 0.4%/yr degradation rate for 20 years A 25 year old asset producing 87% of original power SunPower New Warranty

25. The new warranty reflects who we are  SunPower –Vertical integration (from ingot production to system installation) –Partnered with TOTAL SA (the Fortune 11 th company) –Over 25 years of experience in Silicon Valley  Maxeon ™ technology –The most powerful and reliable PV cells –Less than 200 modules returned from over 6 million shipped –Independent studies showing high performance and minimal degradation

26. SunPower Reliability Videos Short videos demonstrating how the design of the Maxeon solar cells results in high modules reliability in various stressful environments. Google “SunPower reliability” or visit SunPower channel on YouTube:  Humidity: http://www.youtube.com/watch?v=VqqS1Exq2Hkhttp://www.youtube.com/watch?v=VqqS1Exq2Hk  Thermal Cycling: http://www.youtube.com/watch?v=2lTotfOgLWshttp://www.youtube.com/watch?v=2lTotfOgLWs  Loading: http://www.youtube.com/watch?v=9zQ9dHR-uBghttp://www.youtube.com/watch?v=9zQ9dHR-uBg  Shading: http://www.youtube.com/watch?v=0qVfge4J1aAhttp://www.youtube.com/watch?v=0qVfge4J1aA 26

27. 27 EFFICIENCY PERFORMANCE RELIABILITY

28. © 2012 SunPower Corporation