National demand is the central load pressure around which visible support channels reorganise.
This page replays public GB half-hour data as a power-flow organisation projection: a thin geographic membrane constrained by simplified National Grid public route shapefiles, with half-hour role reads and a latest regional carbon-intensity tint.
This is not the electromagnetic field itself. It asks whether the publicly visible power-flow organisation still has multiple ways to support continuous demand.
National demand is the central load pressure around which visible support channels reorganise.
Embedded wind and solar are treated as visible distributed support, not as the whole generation mix.
Imports, exports and Scottish transfer are read as boundary channels in the public projection.
Pump-storage pumping is read as visible absorption, not a complete storage-control model.
NESO demand data gives visible support channels, not full topology, phase angle, frequency dynamics, or PMU-level field state.
The question is not whether the grid fails. It is whether visible support remains distributed enough to keep multiple continuation routes open.
A stronger version would add historic demand, fuel mix, balancing data, weather, and eventually PMU/phasor streams.