What I don't get is why that number apparently went down since. This daily report only mentions 54 solar parks:

Los 54 parques solares fotovoltaicos generaron ayer 4240 MW/hora, con una potencia máxima de 792 MW.

Funny side note, even the writer of this note is confused by W vs Wh. They must mean 4240 MWh, MW/h is meaningless.