Hydropower works well in Norway and Switzerland (and no doubt other places with high mountains and rainfall). Our climate and topography limits its use here to Scotland which already provided some. There are plenty of ideas to generate electricity from the movement of water but they are rarely cost effective or environmentally sound.
I believe wales has 2 of the top 5 Hydropower stations in the UK with Dinorwig at the number one spot 1728MW and Ffestiniog at number 3 360MW and the other 3 in Scotland. Other than Ben Cruachan I can’t think of the other 2 lol