Check items stored in cold rooms and refrigerators. You may need to transfer vulnerable items to equipment served by emergency power. Another solution is to use dry ice to protect critical supplies. In particular, check that the air flow of your fume hood has been restored. Keep the sashes closed and do not use the hood until the ventilation system is working again.
Planning makes any emergency easier to handle.
Take this opportunity to review your laboratory and building emergency procedures before a power failure strikes again.