System map
GB grid flows
Measured interconnector exchanges and day-ahead transmission-boundary forecasts, shown together without mixing actual and forecast data.
Boundary positions represent transfer interfaces, not individual transmission circuits.
Internal transmission boundaryInternational interconnectorArrow shows flow directionBoundary <75%75–90%90–100%Constraint action requiredImportExport
Live exchange data · Not availableBoundary forecast source · Not available
Cross-border exchangesElexon FUELINST · measured every five minutes
Transmission boundariesNESO day-ahead constraint flows and limits
Map geometryNatural Earth coastlines · representative NESO boundary positions