I love the insight into this topic, by the way.
Regarding telcos....
The only remedy that I know of would be to bury a DC connection to the Eastern grid into the ocean floor. That would be incredibly expensive, given the distances and jurisdictions involved.So I have a good deal of experience with the infrastructure. Power was good and clean in most places... stable voltages, solid frequency. The issues were all about the fact that power plants had no redundancy, and insignificant reserve capacity.
In the period from the 70's through the 90's, it was uncommon to have a week go by when the power did not go out at least once. It improved by Y2K somewhat, but power did go out much more often than on the mainland. Much has to do with the fact that Puerto Rico, and island, is not connected to a regional power grid.
Actually, Texas does have DC links that can be activated if needed. The separation of the Texas Interconnection from either the Western or Eastern Interconnection is a political decision done to avoid Federal Energy Regulatory Commission and associated entities' regulations. The Texas grid isn't synchronized with any other grid, but, obviously, synchronization isn't an issue where DC is involved.We have seen what not being part of a wide grid has done in recent years in Texas, even though Texas is about 200 times larger than Puerto Rico.
Regarding telcos....
That reminds me of a skit that I read in a high-school Spanish class. Because of my interest in electronics, it stood out. It was about how difficult it was to get phone service in Mexico. This was in the 1970s. No one in the class quite believed it. Later, a college friend from Peru said, when I told him that, "oh, it's true!"Yes, and for a while there were two, both gum'mint run, serving different areas. As I mentioned, it took weeks if not months to get a new landline.
And that was better than Ecuador, where I was told one to two years for a new line for my new radio station in 1964. We got several lines by buying the "rights" to them from the heirs of people who died or a business that closed.
The first I got, 234-595, cost me S/. 1,500 to purchase. That was the studio line for Radio Musical, HCRM, 570 AM which went on the air 61 years ago last Friday.