Comment by flakiness

Japan used to have many dams for the electricity but then scaled them down (or not scale it up) due to environmental concern. I'm not sure it was a right call given the limited availability of options there. They are also strong anti-nuclear sentiment which I have some sympathy. However you need something you have to make a call.

This map says hydro share is like 8%. https://app.electricitymaps.com/map/zone/JP/live/fifteen_min...