The startup, named Physee, wants to make modern commercial and housing estates energy neutral. Co-founder and CEO Ferdinand Grapperhaus says, “Large commercial estates consume a lot of energy. If you want to make these buildings energy neutral, you never have enough roof surface. Therefore, activating the buildings’ facades will significantly contribute to making the buildings energy neutral.” He says that the cost of the wiring bringing power from the grid to windows is considerable in large commercial estates. As a result, investing in power-generating windows would make commercial sense.