Solel Solar Systems Ltd. (Hebrew: סולל‎) was an Israeli solar thermal equipment designer and manufacturer based in Beit Shemesh, Israel. Solel made equipment for solar thermal power plants, facilities that used the sun's heat to create steam and turn an electricity generator. In October 2009, Siemens signed a $418-million contract to buy Solel Solar Systems. As part of the deal, Siemens committed itself to leave the company headquarters and some of its manufacturing facilities in Israel for at least five years.