No that's not the case:

  However, several officials and energy experts have rejected the idea that renewables are to blame. EU energy commissioner, Dan Jørgensen, stated that there was "nothing unusual" about the electricity mix at the time of the blackout, and that the outage was not due to a "specific source energy". [1]

[1] https://en.wikipedia.org/wiki/2025_Iberian_Peninsula_blackou...