Communication on the potential of applied PV in the European Union: Rooftops, reservoirs, roads (R3) Georgia Kakoulaki, Nigel Taylor, Sandor Szabo, Robert Kenny, Anatoli Chatzipanagi and Arnulf Jäger-Waldau EPJ Photovolt., 15 (2024) 2 Published online: 30 January 2024 DOI: 10.1051/epjpv/2023035