Having Power backup at 1 Central Location is feasible and all LCOs usually are having it, but when not using FTTH technology, you need to have power backup not only at central location but throughout your entire network (in at least few locations along the way) and this is usually difficult to achieve in the environment in which LCO operates... messy and unstructured areas.
FTTH guarantees that power and weather related issues will be minimal, or close to zero.
I suggest to give it a try on Excitel Fiber when it becomes available in your area.