Trigger for Northern Lights, power grid, geomagnetic storms

Brilliant

Iceland's street lights turned off so city can enjoy Northern Lights

INDEPENDENT.CO.UK

David Bebee/Waterloo Region Record, via Associated Press

Scientists Find Trigger for Northern Lights

By KENNETH CHANG

Researchers hope the finding will be a step in developing reliable forecasts of geomagnetic storms that can disrupt both satellites in orbit and power grids on the ground.

power grid

The noun has one meaning:
Meaning #1: a system of high tension cables by which electrical power is distributed throughout a region
Synonyms: power system, grid