hydro-

coal, some gas,nuclear and hydro.Of those, only nuclear and hydro are green.

One is of sustainable energy generation, which is primarily wind and solar.There's also hydro, geothermal,I'm actually pro-nuclear.

China's building 800 gigawatts of coal,400 gigawatts of hydro,about 200 gigawatts of nuclear,

Well, over one third of our electricity generation is already clean,mostly from hydro and nuclear,along with wind and solar,

And so far there are only three major sources of that --coal and gas, hydro-electric,which in most places is maxed-out --