[epistasis]

There needs to be two components: a transfer switch to get off grid power and onto a generator, and then the generator itself.

It looks like Florida started to require installation of transfer switches on stations on evacuation routes, after hurricanes in the early 2000s:

https://www.simplemost.com/gas-stations-pump-without-electri...

However they do not require generators on site, and only require companies with a 10 or more stations in a county to have generators available, but then only within 24 hours.

This is more regulation than I had expected!

There was great article on HN years ago about a Canadian (New Brunswick, maybe?) gas station run by a former software engineer, and how he had planned for an outage by getting a generator for his station. But when the power outage happened, he was too far away to get back to his station, and couldn't find a place to fill up to get back. Wish I could find it again...