Overview
- Endesa’s José Bogas and Iberdrola España’s Mario Ruiz-Tagle told the Senate that REE’s planning and real-time corrections on April 28 left the system with too much non‑synchronous generation and too few tools to manage a later overvoltage.
- Iberdrola confirmed the Badajoz site was its Núñez de Balboa photovoltaic plant and asserted it neither caused the oscillation nor the blackout, adding there was no experiment that day and that equipment remains sealed.
- Executives said REE’s current “operación reforzada” runs many more conventional units daily—about 15–20 versus nine on the day of the outage—and cited recent incidents that did not escalate because of this added backup.
- Companies referenced a Nera estimate of €1.1 billion in extra system costs through year‑end for the reinforced mode, which REE countered at €516 million, noting higher gas generation raises consumer costs; Endesa cited €200 million in costs and €30 million in related revenues for its own portfolio.
- Bogas backed Spain’s decarbonisation goals but called the rollout flawed, urged legal changes so wind and solar can provide voltage control services, and suggested postponing nuclear closures by several years.