The Main Space is the largest hireable room within The Substation, a former industrial electrical facility at 1 Market Street in Newport. It has lacquered timber floors, perimeter drapes for near-blackout conditions and a ceiling approximately 8.9 m high. The operator’s detailed room specification gives 450 standing, while the introductory page references 500; use the detailed configuration figure pending confirmation. Two adjacent rooms can serve as dressing rooms or support spaces but must be booked ahead. Suitable uses include performances, markets, rehearsals, fashion shoots and workshops. The Substation advertises a closure from 20 December 2026 to 21 February 2027.