I remember reading an article when doing digging on doe for the ai thing, in the report they say most US major cities would be out of power for 10 days and all power would be restored in a matter of a month if you give me a bit I can find it or I’m sure someone else will
https:// www.ferc.gov/industries/electric/indus-act/reliability/cybersecurity/ferc_executive_summary.pdf
https:// www.ferc.gov/
The pdf is their findings