Don't forget a fresh supply of batteries. Keep your staff informed. Turn equipment off. This will reduce the potential for damaging equipment or tripping breakers. After the electricity is restored, stagger the start of large equipment.
Large equipment includes chillers, air compressors, process equipment, etc.
Prevent refrigerated food from spoiling by keeping cooler, refrigerator, and freezer doors closed. Run available emergency generators. When power is restored, use water sparingly. Listen to local radio channels for public announcements about power restoration.