Generators are great.
Out typical blackouts are 1-2 hours, but lately we've had a few that ran 9+ hours. That's longer than what I consider something the frozen/refrigerated food can weather so I bought a dual fuel (gas/propane) unit and run extension cords.
The excellent LBD setup is where I'm headed, or maybe go fulll-in with something larger for whole house with an automatic transfer switch.
Most every central gas heater in a house needs electricity to run the blower.
Of course they've begun hinting at making them expensive(r) or banning them because of their lack of catalytic converters and CO2 sequestration.
It's just going to be getting worse as grid stability yields to a greater percentage of intermittent sources (i.e. solar and wind)