The BIGGEST problem with clean energy

Check out 'flywheel batteries' too! There are a bunch of companies working on carbon-fiber or cement composite high-speed rotating masses! Anyway very cool to see a video on this topic! Energy storage is so important and yet we don't hear much about it compared to energy production.
Here in France we produce mainly with nuclear, and because it's not very flexible we have a lot of dams to store the excess and top up the grid during peak demand! 👌