SunPower is a vertically integrated solar module manufacturer and systems installer. The company's modules derive from crystalline silicon technology and possess the industry's highest conversion efficiencies (the percentage of sunlight that is converted into electricity). French oil giant Total is now SunPower's majority shareholder. The operatinig business segments of the company are Residential Segment, Commercial Segment and Power Plant Segment. The maximum revenue of the company comes from Power Plant Segment, which includes power plant project development and project sales, and engineering, procurement and construction services for power plant construction.