Things that don't work without electric power:
* Refrigeration. For a 6-12 hour power outage, leaving the doors closed is sufficient. For 1-3 days, fridge temperatures may be maintained by buying bags of ice, but not a freezer.
* Emergency communication. Landline phones might still function, depending on exactly where the breakage occurred. Cell phones have 24-48 hours of battery power at the most.
* Central heating. Even a gas furnace requires electricity for its controller.
* Kitchen ranges (conditional). For a gas range, this depends on whether you have a lighter or matches.
A power outage disrupts normal life. During a power outage, you cannot cook food, cannot preserve food, and cannot heat your home. Depending on the duration, sheltering away from home may be the less disruptive option.