Remember, water conducts electricity. Don't run extension cords through flooded areas, use or touch electrical tools or appliances if you are standing in water, and don't enter flooded areas until you are sure that the situation does not pose an electrical shock hazard.
Water can damage electrical appliances, such as furnaces, freezers, refrigerators, washing machines, dryers, fans, dehumidifiers, etc. Electrical equipment and appliances exposed to water can be extremely hazardous if they are put in service without proper reconditioning or replacement. Ocean water and salt spray can be particularly damaging. Electrical panels that have been submerged or exposed to saltwater will need to be inspected by a qualified electrician.
If you have questions or concerns regarding electrical service contact your local utility or qualified electrician.