The problem, as I often say, is that just because something demos well and it's easier to buy something doesn't mean it's going to be good in production. If you have a solar farm but you need to build a coal plant large enough to power the island anyway because you don't have dispatchable power, then you end up with Australia, California, or Ontario, where "the cheapest power" causes electricity costs to rise. Meanwhile, In places like Norway, Quebec, and iceland, those renewables actually drove down electricity costs because the marginal cost of energy is very low and you don't need to double up your infrastructure even if it's expensive and difficult to build up-front.