In addition to the Tuscan, Textured, Smooth, and Slate styles of solar roof tiles previously announced by Tesla Energy, the Gigafactory is testing a new "Industrial" style solar roof. The fact that you don't notice any solar panels on the roof of the Gigafactory is precisely why this particular style was developed. It allows factory/warehouse owners to stealthily enjoy the benefits of renewable solar energy in locales where such an implementation may be viewed with suspicion, hostility or disdain.