According to the USGS, there are substantial gas deposits near Puerto Rico.
This can be a good thing. Link to Document. Under typical capacity factor a modern 1 on 1 natural gas 215 MW combined cycle unit burns through 10bcf of gas/year, the potential recoverable gas means 25.5 years of fuel on this unit.
It is not the end-all solution but it could potentially contribute to improve the island’s fuel diversity with cleaner energy.