Doorn – Anyone driving down the street will look twice. Because what is on the roofs of an ordinary residential area in Doorn? Yes, the solar panels of three houses on the Klaproos are really there in the order L, U, L. Small detail: “They have been there for three years,” sighs Jos Sleyfer, director of the Heuvelrug Wonen housing association. “And suddenly everyone thinks something of it.”