I wouldn't worry about powering the cell tower itself, but more about the backhaul infrastructure that it relies on. In cities it relies on fiber that's often l

I wouldn't worry about powering the cell tower itself, but more about the backhaul infrastructure that it relies on. In cities it relies on fiber that's often leased from various providers and terminates at datacenters where it shares switching equipment with a lot of other customers of the provider & datacenter, so power can't effectively be segregated. If that datacenter can't be kept powered (and that will require a lot of power), it doesn't matter whether the tower itself remains powered.