(WO9600871-A1)      Thermal and/or electric energy is generated from solar radiation by a solar collector (2) with an absorber (4). The latter is surrounded, at least in part-sections energy concentrator (6), optically focussing the solar radiation onto the absorber.    The energy concentrator comprises a prism assembly (12) in at least one peripheral region, corresp. to the daily sun travel. The assembly is irradiated with sunlight and consists of axial, adjacent prisms (14), parallel to the absorber and peripherally distributed. They may have convex outer faces (20) on the side facing the sunlight.    ADVANTAGE -   Improved, low-cost concentration factor and consequent efficiency.    (JP10502162-W)      Thermal and/or electric energy is generated from solar radiation by a solar collector (2) with an absorber (4). The latter is surrounded, at least in part-sections energy concentrator (6), optically focussing the solar radiation onto the absorber.    The energy concentrator comprises a prism assembly (12) in at least one peripheral region, corresp. to the daily sun travel. The assembly is irradiated with sunlight and consists of of axial, adjacent prisms (14), parallel to the absorber and peripherally distributed. They may have convex outer faces (20) on the side facing the sunlight.    ADVANTAGE -   Improved, low-cost concentration fctor and consequent efficiency.    (US5727585-A)      Thermal and/or electric energy is generated from solar radiation by a solar collector (2) with an absorber (4). The latter is surrounded, at least in part-sections energy concentrator (6), optically focussing the solar radiation onto the absorber.    The energy concentrator comprises a prism assembly (12) in at least one peripheral region, corresp. to the daily sun travel. The assembly is irradiated with sunlight and consists of of axial, adjacent prisms (14), parallel to the absorber and peripherally distributed. They may have convex outer faces (20) on the side facing the sunlight.    ADVANTAGE -   Improved, low-cost concentration fctor and consequent efficiency.    (EP767889-B1)      Thermal and/or electric energy is generated from solar radiation by a solar collector (2) with an absorber (4). The latter is surrounded, at least in part-sections energy concentrator (6), optically focussing the solar radiation onto the absorber.    The energy concentrator comprises a prism assembly (12) in at least one peripheral region, corresp. to the daily sun travel. The assembly is irradiated with sunlight and consists of of axial, adjacent prisms (14), parallel to the absorber and peripherally distributed. They may have convex outer faces (20) on the side facing the sunlight.    ADVANTAGE -   Improved, low-cost concentration fctor and consequent efficiency.