An exceptionally large or strong grid; specifically an electricity grid serving a larger area than other grids or incorporating other grids, typically covering an area of a country or more at a higher transmission voltage. [A trademark in the United Kingdom for electrical distribution networks.]
Origin
1920s.
Definition of supergrid in US English:
supergrid
noun
An exceptionally large or strong grid; specifically an electricity grid serving a larger area than other grids or incorporating other grids, typically covering an area of a country or more at a higher transmission voltage. [A trademark in the United Kingdom for electrical distribution networks.]