Up in the big woods, the "Seneca Pumped station" has been producing electricity since 1970..Huge opportunities still have not been put to use much. Geothermal is one..Hawaii tried it and after a while the lava tube it occupied was destroyed by an eruption. Here in PA our ridges are covered by extremely expensive and inefficient [ 15%] windmills..Solar is still stuck in the 70's at 15%..Batteries too,,,baby steps..Someday.
It IS a wonderful thing IMHO that "green energy" has evolved to a point where it's often less expensive than fossil fuels. I think the documentary gives a bit too much credit to China for that... But China does have a big motivation to stop using coal. I was in a hotel in Beijing 15-20 years ago, and on one of the days I was there, you could barely see the buildings across the street! The pollution on a bad day is like a thick fog.
A month ago I flew from Alabama to Oregon via San Francisco. At some point I looked out the airplane window and saw this:
I got out my GPS to figure out where we were, and eventually I figured out that what I had seen was the "Crescent Dunes" solar energy plant. Basically 1.2 square miles of mirrors focusing the sun onto a tower full of molten salt, halfway between and Reno and Las VegasYou can read about it here:
Another cool "green" thing IMHO we have in the Tennessee River south of Arrowhead, is TVA's "Raccoon Mountain" pumped hydro storage reservoir on top of a mountain west of Chattanooga. Basically a huge water-based battery that TVA can charge fully in about 28 hrs, and discharge in 22 hrs from the electric grid. You can read about that here: