For decades, commercial fusion power has seemed perpetually out of reach. Now two companies are building toward something much more concrete: putting fusion-generated electricity on the grid.
Commonwealth Fusion Systems (CFS) is building SPARC, a demonstration fusion machine intended to pave the way for its first commercial power plant, ARC. Helion is developing Orion, a 50-megawatt fusion power plant intended to supply electricity to Microsoft beginning in 2028.