Abstract: A floatable module is for concentrating incident solar radiation onto photovoltaic elements. The module has a plurality of photovoltaic elements, provided as substantially parallel elongated strips, each having a surface for receiving incident solar radiation a plurality of linear reflectors with primary, concave surfaces for concentrating said incident solar radiation onto said photovoltaic elements, the reflectors having length axes substantially parallel to said elongated strips. A base onto which said reflectors and photovoltaic elements are placed. The photovoltaic elements are placed non-horizontally on said base such that a normal of said surface for receiving incident solar radiation has an upwardly directed vertical component. There is also described a system comprising one or more such modules as well as a method for assembling such a system.