Iberdrola Targets REE's Governance Structure Over Spain's 2025 Blackout
Iberdrola's conflict-of-interest charge against REE extends the April 2025 Iberian outage debate from a technical failure into an institutional one.
Iberdrola said on Tuesday (2026-07-22) that Spain's April 28, 2025 mass power outage exposed a conflict of interest in how the country's transmission system operator is structured, Montel reported. The allegation, raised more than 15 months after the event, pushes the conclusions of the post-outage investigation beyond the technical into the institutional.8
The outage left millions of homes and businesses without power across the Iberian Peninsula for hours. Reuters reported that grid operator REE (Red Eléctrica de España) failed to calculate the correct mix of energy, and that failure was among the factors preventing the grid from coping with the surge that preceded the collapse. Experts had also found the outage was preceded by extraordinary conditions on the system.5,6
The specific nature of the conflict Iberdrola has identified was not publicly detailed. But the allegation adds a regulatory dimension to what post-event investigations had framed primarily as a technical miscalculation. If the TSO faces competing institutional pressures that affect how it manages the system, the emergency measures Spain has enacted since the event may not fully address the underlying issue.8,1
A year on from the outage, Spain has implemented a raft of emergency steps to boost grid stability, Montel reported. The system they are trying to stabilise has been transformed. Spain has almost no oil or gas of its own. In a decade it has reshaped its energy matrix into one where wind and solar now account for more than 40% of total electricity supply, according to Economist reporting. A Bank of Spain study estimated wholesale electricity prices were 40% lower in 2024 than they would have been had the energy matrix remained as it was in 2019. Nuclear provides 19% of generation and anchors baseload output. But higher variable-generation shares also mean faster frequency deviations and less margin for operator error.2,1
Spain's energy regulator has separately been probing nuclear output, but lobby group Foro Nuclear said on Tuesday (2026-04-28) that the investigation has no connection to the April 2025 blackout and does not concern plant safety. That probe runs on a separate track.4
Engineers restored power after the outage using hydropower as the primary black-start resource — feeding electricity from these sources into the grid to bring essential services, including hospitals and defence sites, back online first. Diesel and gas were also available for the same purpose. Energy was then slowly ramped up and carefully matched across the network before broader supply was restored.7
Iberdrola's governance challenge to REE is landing in a period of heavy TSO investment across Europe. ENTSO-E, the European TSO regulator, has estimated that meeting EU electrification goals by 2050 will require around €800bn of grid spending. Individual operators are already committing large sums: TenneT plans to spend €200bn by 2034, France's RTE has outlined €100bn between 2025 and 2040, and Italy's Terna is investing €18bn over 2024 to 2028, all per Economist reporting. In Germany, 500 GW-worth of battery storage projects have applied for grid connections, more than 20 times current installed capacity. The scale of that pipeline makes TSO governance a question for the whole continent, not just Spain.3
Spain's regulators have not publicly addressed Iberdrola's conflict of interest charge. With REE's miscalculation already on the record and variable renewables now past 40% of Spanish supply, the pressure on how the grid operator is governed will not diminish as new capacity keeps connecting.8,1