https://phys.org/news/2018-07-tesla-puerto-ricans-solar-power.html

The people of Adjuntas call those places "cucubanos," an indigenous Puerto Rican firefly. They're part of a small but growing movement to provide the U.S. territory with sustainable, renewable energy independent of the decrepit power grid.

A scattering of hardware stores, barbershops and corner stores across the island are embracing solar energy, trying to wean themselves off a state-owned power company that remains heavily dependent on imported petroleum. The numbers remain small—a few dozen or hundreds out of millions of power users—but power industry officials and environmentalists are closely watching this as a test of whether Puerto Rico can make a large-scale switch to renewable, off-grid energy.