MIT researchers have developed a concrete-based supercapacitor that can store electricity in building foundations and roadways. By mixing cement with carbon black, the material forms a conductive network that stores charge physically, not chemically. A 45 cubic meter foundation could hold about 10 kWh, enough for a typical home for a day, though the material is still in early research. The approach could reduce reliance on lithium-ion batteries for solar storage, especially in new construction. But the concrete loses structural strength as carbon content rises, and supercapacitors discharge quickly, so practical use depends on power electronics and building codes. The research was published in PNAS. For clean energy developers, this is a promising but distant option. It does not replace dedicated battery systems yet, and questions remain about cost, durability, and real-world performance. Still, it shows how common materials might play a role in grid decarbonization.
