What happened at Iberdrola's 'Núñez de Balboa' PV Power Plant?

The "mystery" of what happened at the "Núñez de Balboa" photovoltaic power plant is, to this day, one of the most significant unresolved questions of the Iberian blackout. In this post I elaborate on this issue by using open-source intelligence, official reports and a bit of reverse engineering. Introduction In a recent official hearing of the Spanish Senate commission investigating the blackout,…