Mountain hydro is fantastic but have an important issue: you need water and mountains, something not such rare but not so widespread either so it's VERY good to

Mountain hydro is fantastic but have an important issue: you need water and mountains, something not such rare but not so widespread either so it's VERY good to have as much as mountain hydro, but hardly suffice for most countries in the world. Sure some are luckiest like Norway or Swiss, but others are not, at least not for vast part of the country. That's the real "unfashionable" part. The rest is just a matter of expectation: PRs have sold to many the idea we can bring with us energy in significant quantity, p.v. actually offer that in a vast area of the world, of course only when the Sun shine, while you can't hardly have mountain hydro at home except veeeeeeeery few homes. Some also might fear dam incidents, oppose against not-so-small projects etc. That's is.