May 17, 2019 · It started with a brochure, which made its way into the offices of the Portland Business Journal.And as confirmed by the company, SunPower will be selling the former SolarWorld factory in Hillsboro, Oregon which it bought last year, and then leasing back a portion of the factory, which Portland Business Journal put at around 200,000 square feet of the 465,000 square foot complex.