
In 1859, the Carrington solar storm sent currents surging through telegraph wires, shocking operators, igniting telegraph paper and allowing some lines to transmit with their batteries disconnected. A comparable storm today could cause widespread blackouts—and one influential worst-case assessment warned that full recovery might take four to ten years, although experts remain divided over how severe the damage would actually be.
The 1859 Carrington storm set telegraph offices sparking. A repeat could threaten modern power grids, and a much-quoted worst-case put full recovery at four to ten years, though experts disagree on the true scale.














