Looks like they're using French nuclear to help black start the grid [1]. Solar and wind systems could have caused the instability issues that led to the Spanish Nuclear requiring isolation. It will be interesting to see the final investigation, but my bet is that "induced atmospheric vibration" is a PR deflection from a badly designed and operated system [2].

[1] https://transparency.entsoe.eu/transmission-domain/physicalF... [2] I'm not necessarily blaming the engineers, but the politicians who force those engineers to put square pegs in round holes. For example, I can imagine politicians making a short term decision to skimp on energy storage while increasing renewable penetration. Surely renewable systems must be less reliable without storage given the lack of rotational inertia?