As a result of this blackout, the capacity for electricity interconnection between Portugal and Spain was established at 0 MW for imports from May 1 to May 4, 2025.

Consequently, Portugal is unable to benefit from the lower wholesale electricity prices available in Spain, leading to significant financial losses for consumers.

In just two days following the blackout, the financial impact on Portuguese consumers has already exceeded 9 million euros, according to calculations by Expresso.

This situation is projected to cost Portugal an additional 14 million euros by May 7, 2025, further straining the country's energy budget.

The price discrepancy caused by the import suspension is expected to add over 5 million euros to the costs of the Portuguese electrical system by May 6, 2025.

REN is preparing a preliminary report on the blackout, which is due to be submitted to the Entidade Reguladora dos Serviços Energéticos (ERSE) by May 5, 2025.

On May 4, 2025, Portugal is grappling with a significant rise in electricity costs due to a suspension of imports from Spain, which followed a major blackout.

The blackout, which occurred on April 28, 2025, in the Iberian Peninsula, prompted REN - Redes Energéticas Nacionais to cut imports to maintain grid stability.

Within 20 days of the blackout, REN must provide a comprehensive report detailing the causes of the interruption, the affected areas, and the recovery actions taken.

ERSE has the authority to extend the 20-day deadline for the complete report in cases of high complexity involving multiple European entities.

As the situation unfolds, the ongoing technical issues continue to cost Portuguese consumers millions of euros, highlighting the urgent need for resolution.

The preliminary report will describe the situation and characterize the incident, as mandated by ERSE for significant impact events.