You really, really want the machining on things like this to be as close to perfect as possible, lest it wobble itself right out the door.
From Interesting Engineering, September 15:
With a power output of 30 megawatts, China’s Dinglun flywheel energy storage facility is now the biggest power station of its kind.
The US has some impressive flywheel energy storage plants. The largest of these is the 20 MW Beacon Power flywheel station located in Stephentown, New York. Until recently, it was the world’s largest flywheel energy storage system (FESS), but not anymore.
China has developed a massive 30-megawatt (MW) FESS in Shanxi province called the Dinglun flywheel energy storage power station.
This station is now connected to the grid, making it the largest operational flywheel energy storage facility ever built....
....MUCH MORE, quite a project.
