[crote]

Nonsense. For a stable grid you need inertia. Traditionally this has been provided by the spinning mass of turbines, but there's no technical reason why those have to be used.

For example, the UK has been building a bunch of "synchronous condensers" for this reason - essentially a giant flywheel. Battery storage can easily provide a massive amount of inertia as well - provided it is configured to operate that way.

The Spain blackout was mostly caused by misconfiguration. It is not in any way representative of any inherent characteristic of a renewable grid.