With the destroyed power grid on the island of Puerto Rico...

[dumbcat]

18. I think most of those concepts have been looked at

And several of them are problematic, and expensive. I am sure there would be support for many of them, depending on who gets to pay the bill.

Underground distribution lines are feasible at low and medium voltages, but problematic with the high voltage lines linking distribution centers. High voltage alternating current has issues about being underground. Doable, but very expensive.

I'm all for solar power arrays, but I was pretty disturbed by some pictures I saw of a commercial solar panel farm that went through the hurricane. It tore the panels up pretty bad. Not sure how to protect large, flat, fixed, wind-catching panels from hurricane winds.

Off-shore wind turbines look pretty good. They are designed to withstand most hurricane force winds, but Cat 5 storms, though rare, may be problematic. See:

https://phys.org/news/2017-06-offshore-turbines-vulnerable-category-hurricane.html

But the biggest issue is financing. Lots of great ideas and techniques to be studied, installed and tested. Who gets to pay for it? The ratepayers? The Puerto Rican government, through taxes on it's people? (Their credit to issue bonds is not too hot right now.) Or should the US taxpayers in general pay for rebuilding the grid, just because ......?

It is going to be interesting seeing how this plays out.