A geomagnetic storm as strong as one experienced in 1859, if it occurred today, could destroy thousands of utility transformers and cause power outages lasting months or even years.
Our Fragile Power Grid
There’s an excellent article in today’s New York Times on the vulnerability of our power grid to climate change.
Vulnerability of the U.S. Power Grid
With adversaries’ malware in the national grid, the nation has little or no chance of withstanding a major cyberattack on the North American electrical system.