NG provides about a third of our grid electricity today, as does coal. Nuclear is around 20%. Hydro is what 8% or so?
The rest is kind of in the weeds, though wind is growing, 5-6%.
Hawaii historically, like most islands, used fuel oil to burn to make steam and electricity. I would think they would benefit most by a wind/solar focus, but to date it has been rather limited. I read they are trying to move in that direction but capital is scarce.
The place we visit in Hawaii when we go gets 3" of rain a year, usually in one day (I've been there on that day). It is both consistently sunny and much of it is lava fields (from an 1860 flow). There is very little solar around, a handful of wind turbines up in the mountains. There is a Federal geothermal/magma research center there that has a few PVs outside. I suspect that place is a boondoggle as geothermal has not seemed to make any progress that I can discern (I don't mean the heat pumps.).