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Iberian power outage offers valuable lessons

2 May 2025

Commentary
Jennifer Aguinaldo
Energy & technology editor

The root cause of the power outages that gripped parts of the Iberian Peninsula on 28 April has yet to be established, pending a detailed investigation into what triggered the loss of power in large swathes of Portugal and Spain.

Ongoing investigations aside, Spain’s national electricity grid operator, Red Electrica, has ruled out a cyber attack or sudden spike in renewables as the main cause of the outage, which affected transport, retail and healthcare services, among others.

Insurance claims arising from the outages could reach between $300m and $600m in Spain and significantly less in Portugal, according to some sources, while the Riyadh-based Digital Cooperation Organisation cites losses of up to €1.3bn ($1.47bn) for the Spanish economy, based on Spain’s self-employed workers’ association, ATA.

But the highest cost could come in a non-monetary form. It would require probing into Spain’s utility infrastructure, which Red Electrica describes as Europe’s “best and most resilient”, and that of every European country and everywhere else.

Red Electrica president Beatriz Corredor has been quick to defend her firm, saying there is no such thing as zero risk.

The speed at which Spain, which exports renewable power to Portugal, restored power in affected areas lends credence to Red’s best-in-Europe claim if one is willing to forego the question of how it could have happened or been avoided in the first place.

Pending the results of the investigation, analysts and experts have offered their insights on the subject.

Writing on Linkedin, Thierry Lepercq, founder and president at Hydeal, describes the Spanish blackout as “the most significant power event in decades”, adding it is likely the first of a series of crippling crashes that will result from the inherent conflict between decarbonisation, or aiming at 100% renewables; security of supply; and energy affordability.

Lepercq is confident that the lesson will soon be clear: the power outage was all about inertia.

He predicts that the lack of electricity system planning will necessitate radical action. This could involve the “near complete” stop of new variable – solar and wind – installations and the fast ramp-up of fully-dispatchable, inertia-providing capacity from combined-cycle gas turbines (CCGTs) initially powered by natural gas, and as soon as possible, from competitive green hydrogen.

Another senior consultant at an international engineering services firm with offices in Dubai tells MEED that, considering a lot of caveats, the blackout resulted from a mix of high solar reliance, low grid inertia, voltage oscillations and insufficient backup systems, with no single cause confirmed. Some tripping, which catalysed the inertia problem, has also been reported, he notes. 

Prevention strategies could include enhancing firm power, expanding storage, improving monitoring and strengthening interconnections.

Morocco, for instance, played a key role in restoring power to Spain, highlighting the benefits of power pooling, where countries share an integrated generation capacity and grid stability across borders.

Reviewing energy policies is also key, such as looking at grid codes with clearer requirements on how much energy storage should be on the system in proportion to renewable energy development, according to the consultant.

This event offers valuable lessons for regional utility stakeholders, particularly their capacity planning divisions. Over 100GW of renewable energy capacity is planned to be built across the GCC states before 2030, excluding those catering to private clients, with certain developments and projects looking to be powered 100% by renewable energy by 2030.

The Iberian story shows there are as many potential solutions or measures, with none offering zero risk, to address potential points of failure in today’s electricity system, which has been undergoing major re-engineering works to fit the 2030 net-zero scenario.

It is also worth mentioning that certain jurisdictions in the Gulf and broader Middle East and North Africa region regularly suffer from power outages in the summer, mainly due to rising temperatures and underinvestment in electricity generation and distribution networks, and notwithstanding a very negligible amount of renewable power on their grids.

Credit: Crowd at Malaga Maria Zambrano train station entrance due to blackout in Spain and Europe, 28 April 2025. Shutterstock

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Jennifer Aguinaldo

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