"Backfeed" can occur if connection of power is done by an unqualified person directly to a wall outlet. Consult a licensed electrician about proper connection to ensure your safety and the safety of the utility workers repairing power lines.
Keep as cool as possible, drink liquids and wear loose fitted clothing.
Watch out for heat stress, dizziness, nausea and dry skin.
Handle dry ice with gloves to prevent skin damage.