Have a good supply of backup fuel. Insulate water pipes to protect them from freezing. Wear extra layers of clothes and use several layers of blankets. Don't get wet if you can't get dry. Be sure to eat.
Food provides calories that maintain body heat.
Follow manufacturer's instructions on alternative heating or cooking sources. Never use gas ovens, gas ranges, barbecues, hibachis, and most portable or propane heaters for indoor heating. These burn oxygen, create deadly carbon monoxide and may cause fire. Know how to open the electric garage door manually. Use portable generators only as independent sources of power, do not connect them to your home's main service panels.