Huh? Solar panels can certainly be ‘turned off when there’s too much energy’ generation. In fact that’s their default state, they don’t generate any power until you pull current from them. They just sit there with a voltage difference across them.
Yes, that is true. I should have been more clear, sorry.
At least in Germany most private solar systems cannot be remote controlled yet so it's harder to actively steer the generation.
That is different with wind turbines.