Concrete battery for applications in buildings, rooftop PV A prototype of a cement-based battery has been developed in Sweden for potential applications in buildings. Its creators claim it could become a solution to store electricity from rooftop PV and they do not exclude that it could also be used for the storage of large-scale renewables.Scientists at the Chalmers University of Technology in Sweden have developed a prototype of a rechargeable battery based on cement with an average energy density of 7 Wh/m2. Although the new storage technology is described as being at a very early stage of development, its creators are convinced that the device has ...