I went to Madagascar a few years ago, and wondered why they were generating power by diesel (unreliably) for a small town, when they had gigawatts of sun falling on them. But they need some storage & I don't know how to solve that. Mountains plus lots of water would suggest pumped hydro.
In my state(Kadamparaivalparai,western ghats),during peak hours we produce hydel electricity, during off peak hours,excess electricity is used to pump up water.The world is contemplating different ways to store elctrical energy.i read,few over it,in my mind.