An energy system is not described by any single property in isolation, but by how generation, the grid, storage, and demand interrelate. The difference between installed capacity and real output, between power and useful energy, or between local solutions and large-scale systems, is not a technical subtlety — it is precisely what determines whether a system works or fails to work.
This category analyzes the electricity system as a whole: intermittency, grid stability, backup, losses, energy density, and physical limits. The aim is to understand what changes when the analysis stops at a single number and instead examines the full electricity system.