an advertisement . please help improve it by removing promotional content and inappropriate external links and by adding encyclopedic content written from a neutral point of view . december 2015 learn how and when to remove this template message sunpower corporation type public nasdaq spwr industry solar energy founded 1985 founder dr. richard swanson headquarters san jose california u.s. key people thomas h. werner ceo products solar panels revenue us 1 576 470 000 2016 operating income us 206 290 000 2016 net income us 187 020 000 2016 total assets us 4 856 990 000 2016 total equity us 1 449 150 000 2016 number of employees 6 320 december 2013 parent total s.a. 66 % website sunpower.com footnotes references financials from sunpower corporation 1 sunpower corporation is an american energy company that designs and manufactures crystalline silicon photovoltaic cells roof tiles and solar panels based on an all back contact solar cell invented at stanford university . the company is owned 66 % by total europe s third largest oil company and is publicly traded on the nasdaq as spwr formerly spwra and spwrb ; it is a component of the dow jones oil and gas index djusen . contents 1 history 2 cells 3 installations 4 retail renewable electricity 5 dealer network 6 development in stock exchange 7 see also 8 references 9 external links history edit in 1997 the company s solar cells were used in nasa pathfinder high altitude aircraft . 2 in january 2007 sunpower corporation acquired powerlight corporation a leading global provider of large scale solar power systems . 3 in february 2010 it acquired europe s sunray renewable energy for 277 million . 4 on 29 april 2011 total s.a. agreed to buy 60 % of sunpower for us 1.38 billion . 5 on 23 december 2011 the company announced an agreement to acquire tenesol sa . 6 in october 2014 the company was described as silicon valley s dominant solar panel manufacturer . 7 on february 23 2015 sunpower spwr and first solar fslr announced plans to set up a joint yieldco . cells edit the company s main product is a 6 inch 160 mm single crystal silicon solar cell trademarked maxeon packaged into conventional 60 cell solar panels . each cell has a conversion efficiency of 21.5 % and each panel produces a maximum of 345 w ; typical panels of similar dimension produce a maximum of 250 to 333 w. 8 9 10 silicon solar cells typically consist of a thin layer of silicon chemically treated to produce an electrically active layer near the front that produces electricity when the sun shines on it . collecting that energy is normally handled via a series of very fine wires embedded on the front . there is an inherent paradox in the wiring design ; larger wires lower electrical resistance and improve energy collection but reflect light that would otherwise reach the cell and improve energy creation . the wires are normally made of silver for a variety of reasons although less expensive copper and aluminum wiring has been attempted with no great market success . the circuit is completed by a thin layer of aluminum that is deposited on the back of the cell . the maxeon design starts with the same basic silicon cell but changes the electrical connections . the silver wiring on the front is eliminated and replaced by a transparent electrode material similar to the materials used in lcd televisions and similar devices . these electrodes have poorer electrical characteristics than silver but by covering the entire face of the cell they improve overall performance while eliminating light blockage . the back of the cell replaces the thin aluminum layer with a thicker copper one which both improves electrical performance as well as offering a much more physically robust platform while eliminating corrosion that occurs in the aluminum over time . 11 on june 23 2010 the company announced that it has produced a full scale solar cell with a sunlight to electricity conversion efficiency of 24.2 percent a world record confirmed by the u.s. department of energy s national renewable energy lab nrel . 12 after the cells are constructed conventional assembly system uses a robot to place the cells into a grid of 6 columns of 10 cells other arrangements are used but rare outside commercial settings . as they are placed wiring consisting of a strip of silver is woven between the cells and soldered to the connectors on the front and back . a small amount of space is required between the cells to allow the strips to pass over and under the cells . the layout takes place on top of a plastic sheet known as the backsheet and the cells and wiring are glued to the sheet as the assembly advances . when the glue dries the resulting laminate is ready for assembly into a panel which consists of gluing the cell side of the laminate to a glass sheet adding a junction box for electrical connections and adding an aluminum frame around the outside for mechanical robustness . different assembly systems may use different steps but the end result is a glass sheet on top cells and wiring in the middle and the backsheet on the back . the company s panels are similar in concept and layout but include a number of additional changes to further improve the system . instead of using silver strips to connect the cells together which is no longer needed due to the lack of silver on the cells its panels use a robust edge connector that includes a built in strain relief to reduce mechanical stress . according to the company these changes eliminate 85 % of the failures in conventional designs which is due primarily to corrosion and electrical breaks . only 14 % of failures are due to cell or component failures . 11 the downside to these design changes is cost both the materials and construction methods are more expensive and drive up the price of the panels . however the price of the panel is not the only input to a solar power system s total cost and in recent years it accounts for much less than half of the total . in this case using a more expensive panel can actually produce a lower overall system cost if savings can be found in installation time or there are artificial limits on system size . these are both true in the case of residential installs where the roof defines the total size of the system that can be installed and the cost of labor is the largest single cost of the system . simply replacing conventional panels with sunpower panels will increase the total power of the system as much as 25 % without having any effect on install times in which case the total install cost in terms of price per watt can improve in spite of higher prices on the panels . installations edit sunpower has recently announced a number of projects around the world that utilize its patented solar tracker technology . the company maintains a market leading position in spain with more than 61 megawatts installed or under construction ; recently completed a 2.2 megawatt solar power plant in mungyeong korea the 15 megawatt nellis solar power plant in nevada 13 14 and the 579 megawatt solar star pv power plant the largest solar pv power plant in the us . 15 on october 6 2008 agilent technologies and sunpower corporation announced that a 1 megawatt solar tracking system at agilent s campus will start producing electricity in mid october . the system features a 3 acre 1.2 ha parking lot canopy structure with nearly 3 500 sunpower solar panels that track the sun throughout the day . the design of the company s tracking solar system will generate up to 25 percent more energy for agilent than a similarly sized flat rooftop system the company said . as a result agilent s solar parking canopy is the largest solar energy generator in sonoma county california . sunpower donated the solar cells for the nasa aerovironment pathfinder plus high altitude uav which then set an altitude record of 80 201 feet 24 445 m for solar powered and propeller driven aircraft . 16 17 on august 4 2010 the company announced it has completed a 505 kilowatt solar power installation for horizon power a government owned utility providing power to remote and regional communities and resource operations in the marble bar and nullagine areas of the east pilbara region of western australia . the ground mounted sunpower t20 tracker installation is the largest solar tracking system in australia and powers the world s first high penetration hybrid solar diesel power stations . the power stations will generate approximately 1 048 megawatt hours of solar energy per year and will produce 60 percent to 90 percent of daily electricity needs for the remote communities . this project was supported by the australian government through the renewable remote power generation program and implemented by the office of energy in western australia . 18 in 2011 sunpower and ford announced they would give ford electric car buyers an option to install a residential solar panel placed as part of the rooftop that will charge the electric car . 19 in december 2011 the company announced the collaboration with the solar impulse project for the building of hb sia their first solar airplane and later hb sib the second airplane attempting a round the world in 2015 . 20 in june 2012 the company announced the completion of solar panel installation on the second zerohouse 2.0 a net zero home on the east coast . the home built by kb homes and located in waldorf maryland uses solar power and energy efficiency to produce as much energy as it uses . 21 in october 2014 a 16 megawatt system under construction by the company at uc davis was projected to become the largest solar power plant on an american college campus . 7 retail renewable electricity edit the company partnered with citigroup to offer solar lease options to more diversified markets expanding to different states in july 2011 . 22 the company announced plans to compete with retail electric rates by reducing system cost by 50 % by 2012 . 23 dealer network edit solar power system installation companies can be certified by sunpower if they meet certain training program specifications . dealers are sorted into four tiers depending on the level of company specific training completed and the overall level of customer satisfaction . 24 development in stock exchange edit the company s shares have been listed on the photovoltaik global 30 index since the beginning of this stock index in 2009 . see also edit energy portal solar impulse helios prototype serpa solar power plant in portugal swanson s law dr. richard swanson subsidiaries and affiliates of total s. a. references edit sunpower corporation the company history . 2012 . retrieved 2012 12 28 . self published source http us.sunpower.com about history self published source update 2 sunpower to acquire europe s sunray for 277 mln . reuters . 11 february 2010 . herndon andrew ; martin christopher ; goossen ehren 2011 04 29 . total agrees to buy sunpower for 1.38 billion in renewable energy push . bloomberg . retrieved 2011 04 30 . san jose press releases . a b hull dana 2014 10 29 . sunpower earnings solar is increasingly competitive . siliconbeat . retrieved 2014 12 07 . x series solar panels pdf . us.sunpower.com . self published source http us.sunpower.com solar panels technology x series solar panels self published source benq solar sunforte pm096b00 330 watt . solar gmbh.ch in german . retrieved 2016 02 13 . a b performance beyond compare . sunpower usa . self published source http