SOLID Solar Energy Systems GmbH, based in Graz, Austria, specializes in engineering and providing turnkey solutions for large-scale solar thermal energy systems. Established in 1992, SOLID has become a key player in planning, building, delivering, assembling, and operating solar plants that supply hot water, room heating, industrial process heat, and district heating. The company also offers electric and thermal heat pumps and photovoltaics, further expanding its portfolio of sustainable energy solutions. With projects around the world, SOLID combines extensive knowledge and research and development to advance solar thermal technologies and systems.