Backup power is supplied by a pair of 125 kW diesel generators with automated switchgear that requires no human intervention. In the event of a loss of power to the facility, the generators will sense the loss of power and start supplying power to the Freezer Farm only. Should the generators stop running due to a loss of PG&E power, the University of California Police Department (UCPD) will receive an alarm signal and contact Logistics staff. The generators have approximately 300 gallons each of diesel fuel on board, and even with all –86 freezers running continuously, the available fuel represents a 72+ hour supply, which exceeds NIH requirements. These generators are inspected each week, test run every 30 days, run under a minor load each quarter, and run under a full load annually.