If you must use a backup electric generator

NEVER operate the generator in enclosed or partially enclosed spaces. Generators produce high levels of odorless, deadly carbon monoxide very quickly.
Keep the generator DRY.
Plug appliances DIRECTLY into the generator. Or, use a heavy-duty outdoor-rated extension cord rated in watts or amps at least equal to the sum of the connected loads.
DO NOT connect your generator directly to your household wiring, as this can backfeed along the power lines and electrocute anyone coming in contact with them, including lineworkers making repairs.
Make sure the generator is properly GROUNDED.
Do not OVERLOAD the generator. Use only to power essential equipment or appliances.
Make sure FUEL for the generator is stored safely, away from living areas, in properly labeled containers, and away from fuel-burning appliances.
TURN OFF all appliances powered by the generator before shutting down the generator.
Follow the manufacturer’s INSTRUCTIONS.
Keep CHILDREN away from portable generators.

If you must use a space heater

Choose one that has been tested to the latest safety standards and certified by a nationally recognized testing laboratory. It will have a guard around the flame area or heating element.
Place the heater on a level, hard and nonflammable surface, not on rugs or carpets.
Keep the heater at least three feet from bedding, drapes or other flammable materials.
Never leave a space heater unattended either when you go to sleep or when you leave the area. Keep children and pets away from space heaters.