Experts say there is no proof a renewable energy experiment led to the widespread blackout across the Iberian Peninsula in April, as investigations point to a complex grid failure with no single identified cause.

Claims that a renewable energy "experiment" triggered the massive blackout across the Iberian Peninsula on 28 April 2025 are unfounded, according to experts and ongoing investigations.

The blackout affected large parts of Spain and Portugal, following a sudden loss of 2,200 megawatts of generation capacity in southern Spain. The resulting imbalance led to a drop in grid frequency, prompting automatic disconnection protocols and ultimately isolating the Iberian grid from the rest of Europe.

Although renewable sources such as wind and solar were heavily contributing to the energy mix at the time, investigators have not confirmed any link between these sources and the failure.

"There is currently no evidence of a deliberate experiment involving renewables," the European Network of Transmission System Operators (ENTSO-E) said, stressing that the blackout was likely caused by a complex combination of technical factors rather than a single event.

Experts warn that grid stability, system inertia, and interconnection infrastructure are all critical in maintaining reliable energy supply—especially during periods of high renewable input.

The blackout has reignited debate over the integration of renewables into national grids, but energy analysts caution against oversimplified explanations.

"The event highlights the need for robust infrastructure and grid management, not a rollback of green energy goals," one energy systems expert told Euronews.

Investigations are ongoing, but current findings do not support the narrative that renewable energy experimentation was responsible for the outage.

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