I would recommend administrators to get assistance from an eletrical engineering firm/contractor to install a suitably sized and rated standby generator that automatically turns on when the main supply goes down. Have a automated protected fuel supply to the generator which can can be monitored for when it goes on/off, run time, fuel consumed. In this way, you may go beyond troubled waters of regular power outages. UPS:Automatic Battery Backup, Generator :Automatic Supply to keep the Backup up. Of course, all this depends on your budget.