Good question…right off without a cost analysis likely the same sources of financing that supplies the electrical power to an area. The fiber optic installation is either a private investment by ATT, Verizon, etc., or an entity of government (municipal, county, or government sponsored corporation/coop). and
With the increasing frequency and severity of major disruption by storms reinstallation would seem to be a more frequently incurred cost and perhaps a higher cost…particularly as your situation suggest - loss of major power arteries…but I would think even more widespread areas of disruption might occur…such several counties…I suppose something like FEMA might be used for low interest loans but I don’t sense a national mood that would fund FEMA to become a utility investment authority. It seems like the NIL in college sports the changes impacting our daily lives are causing a lot of rethinking.
In the meantime, invest in generator stock