PR won’t be able to finance the majority of repairs, it’s just not realistic. The US Govt, including FEMA, will have to help Americans rebuild. Otherwise, PR will be de facto depopulated by migration to the US and elsewhere.
Isn't is possible to raise money for Infrastructure-specific projects, which would be paid back by with revenues raised from selling power? I don't understand why its not a good investment: all people need power, they need to buy it somewhere right? If they had a clause which said revenues from the customers would be first used to pay back the specific debt... is that possible?
It is a good investment until due to mismanagement they don't make enough revenue to pay up. PREPA is already in default on their bonds so I don't see how they can convince anyone to lend them even more money. The previous bondholders probably have dibs on the income stream already.
I think you are describing a Public Private Partnership.