Is there enough potential capacity of solar + wind + hydro to meet total future demand though?
Yes. And very easily too. ANU did a study in Australia and found pump hydro could cover 100% of the supply needs while only using a small fraction of available sites. Australia is a very flat country so I'd imagine it is even easier in most countries.
That shouldn't really matter. It was something like 1% (?) of the available sites to make Australia 100% renewable. So in the US it might be 15% - except that the US has a lot more mountains and a lot more water near population centers.
Yes. And very easily too. ANU did a study in Australia and found pump hydro could cover 100% of the supply needs while only using a small fraction of available sites. Australia is a very flat country so I'd imagine it is even easier in most countries.
See http://www.anu.edu.au/news/all-news/anu-finds-22000-potentia...