https://www.top500.org/green500/lists/2017/11/ https://www.top500.org/green500/lists/2017/11/ There's also a Green500 list of most performance-per-watt, i.e. g

https://www.top500.org/green500/lists/2017/11/ https://www.top500.org/green500/lists/2017/11/ There's also a Green500 list of most performance-per-watt, i.e. greenest, most efficient computers, and Japan is the clear leader there.