Spain Power Outage: Grid Oscillations Detected from 11 AM
The Iberian Peninsula blackout followed oscillations detected from 11 AM. A user cites renewable drops from 55% to 32% and a 72-28 to 45-55 shift.
English · Original discussion in Spanish · Published
Spain Power Outage: Grid Oscillations Detected from 11 AM
At 11:00 AM on the 28th, the Iberian electrical system began to tremble. According to messages in the thread, warnings arrived half an hour later; at 12:00, another; and at 12:10 and 12:30, the final ones. When half of Spain was left in darkness, the trail of the blackout had been recorded in frequency and voltage logs for hours. The alerts did not prevent the blackout.
From this episode emerged a clash of narratives. Some attribute it to deliberate sabotage, while others blame structural failures in a grid unprepared for the current energy mix. Both sides cite figures, but neither has been confirmed.
What the figures say: renewable share dropped from 55% to 32%
According to a user’s count of production graphs, on the day of the blackout, renewable production covered around 55% of demand. The next day, that percentage plummeted to 32%. Subsequent days showed 38% and 41%, a gradual recovery that technical profiles interpret as precautionary reintegration, not proof of anything. The real discrepancy lies not between renewable and non-renewable, but between synchronous and asynchronous generation: this ratio shifted from 72-28 on the 28th to 45-55 on the 29th.
This shift is no coincidence. As several participants point out, solar and wind do not rotate anchored to grid frequency like a conventional turbine; they are asynchronous sources providing less inertia to the system. Less rotating mass means less resistance against frequency deviations. The contextual detail: according to the sabotage narrative, on the day of the blackout, nuclear power contributed around 11% of electricity; in subsequent days, with some offline, that gap had to be filled differently, and in recent records, nuclear operates between 5% and 6%.
Why a sunny day can complicate the grid
One explanation circulating in the thread is also the least dramatic: there was too much production for the expected demand. Clear skies, full solar capacity, and low consumption. A grid with a very high percentage of non-dispatchable generation and limited rapid response capacity becomes fragile against any imbalance. Hence, the technical alerts that, according to some participants, had been issued for months regarding the loss of system inertia.
The same figures serve both sides. Some see proof that a mix with so many intermittent sources is unsustainable without firm backup. Others counter with an uncomfortable fact: the system had been operating with three-quarters renewable electricity for years without incident, and continues to do so on normal days. If the mix were the sole cause, the blackout would have been routine. It was not.
Who operates the axis that fell
The blackout hit hardest the axis running through Andalusia, Extremadura, and Castilla-La Mancha. On this territory operate commercializers and distributors of different ownership, according to a user’s review. One major, Endesa, is a subsidiary of the Italian Enel. The other, Unión Fenosa, is partially owned by Criteria —La Caixa’s investment arm— and a fund controlling nearly 20%. Iberdrola, meanwhile, is Spanish-owned and operates mainly in the north. The map matters because the debate on the cause intersects with ownership, and it is easy to slip into conspiracy theories.
Sabotage as a narrative: who supports it and with what evidence
A portion of comments assumes an orchestrated attack. Without evidence, it is attributed to foreign services —China, Israel, France, Russia, the United States, or Segarro— and to fossil energy owners seeing their business threatened by Spanish solar advances. This thesis is bolstered by the idea that the blackout allowed some media to blame renewables, which for the suspicious serves as both motive and proof.
Against this weigh the records cited by the other side. A user summarized it with irony: if sabotage exists, its authors warned at 11:30, 12:00, 12:10, and 12:30, and no one acted, which does not fit a planned attack. Others compare the management to the investigation line of 11M and suspect an external culprit is being sought before admitting a domestic failure. Some point to a subsequent incident in the AVE grid as part of the same pattern, though evidence is lacking there too.
There remains one disconcerting fact: electricity represents only 20% of total energy consumption; the other 80% still comes from oil. With these figures, the fight over who brought down the grid is fought, in reality, over one-fifth of the problem.
At 11:00 AM on the 28th, the Iberian electrical system began to tremble. According to messages in the thread, warnings arrived half an hour later; at 12:00, another; and at 12:10 and 12:30, the final ones. When half of Spain was left in darkness, the trail of the blackout had been recorded in frequency and voltage logs for hours. The alerts did not prevent the blackout.
From this episode emerged a clash of narratives. Some attribute it to deliberate sabotage, while others blame structural failures in a grid unprepared for the current energy mix. Both sides cite figures, but neither has been confirmed.
What the figures say: renewable share dropped from 55% to 32%
According to a user’s count of production graphs, on the day of the blackout, renewable production covered around 55% of demand. The next day, that percentage plummeted to 32%. Subsequent days showed 38% and 41%, a gradual recovery that technical profiles interpret as precautionary reintegration, not proof of anything. The real discrepancy lies not between renewable and non-renewable, but between synchronous and asynchronous generation: this ratio shifted from 72-28 on the 28th to 45-55 on the 29th.
This shift is no coincidence. As several participants point out, solar and wind do not rotate anchored to grid frequency like a conventional turbine; they are asynchronous sources providing less inertia to the system. Less rotating mass means less resistance against frequency deviations. The contextual detail: according to the sabotage narrative, on the day of the blackout, nuclear power contributed around 11% of electricity; in subsequent days, with some offline, that gap had to be filled differently, and in recent records, nuclear operates between 5% and 6%.
Why a sunny day can complicate the grid
One explanation circulating in the thread is also the least dramatic: there was too much production for the expected demand. Clear skies, full solar capacity, and low consumption. A grid with a very high percentage of non-dispatchable generation and limited rapid response capacity becomes fragile against any imbalance. Hence, the technical alerts that, according to some participants, had been issued for months regarding the loss of system inertia.
The same figures serve both sides. Some see proof that a mix with so many intermittent sources is unsustainable without firm backup. Others counter with an uncomfortable fact: the system had been operating with three-quarters renewable electricity for years without incident, and continues to do so on normal days. If the mix were the sole cause, the blackout would have been routine. It was not.
Who operates the axis that fell
The blackout hit hardest the axis running through Andalusia, Extremadura, and Castilla-La Mancha. On this territory operate commercializers and distributors of different ownership, according to a user’s review. One major, Endesa, is a subsidiary of the Italian Enel. The other, Unión Fenosa, is partially owned by Criteria —La Caixa’s investment arm— and a fund controlling nearly 20%. Iberdrola, meanwhile, is Spanish-owned and operates mainly in the north. The map matters because the debate on the cause intersects with ownership, and it is easy to slip into conspiracy theories.
Sabotage as a narrative: who supports it and with what evidence
A portion of comments assumes an orchestrated attack. Without evidence, it is attributed to foreign services —China, Israel, France, Russia, the United States, or Segarro— and to fossil energy owners seeing their business threatened by Spanish solar advances. This thesis is bolstered by the idea that the blackout allowed some media to blame renewables, which for the suspicious serves as both motive and proof.
Against this weigh the records cited by the other side. A user summarized it with irony: if sabotage exists, its authors warned at 11:30, 12:00, 12:10, and 12:30, and no one acted, which does not fit a planned attack. Others compare the management to the investigation line of 11M and suspect an external culprit is being sought before admitting a domestic failure. Some point to a subsequent incident in the AVE grid as part of the same pattern, though evidence is lacking there too.
There remains one disconcerting fact: electricity represents only 20% of total energy consumption; the other 80% still comes from oil. With these figures, the fight over who brought down the grid is fought, in reality, over one-fifth of the problem.
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Summary of a discussion on Burbuja.info - Foro de economía, actualidad y política., translated from Spanish and reviewed before publication. Read the full discussion (219 replies).
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