Spain's Grid Cuts Industry Power Again Due to Wind Surplus

Wind Surplus, Industrial Shutdowns, and 800 Hours of Wasted Light

How can a country halt its industry due to excess electricity while still paying high bills? The Spanish power grid declared an emergency after Red Eléctrica cut industrial supply due to excessive wind generation, worsened by issues with the Portuguese interconnection early in the morning. There was no general blackout. But the episode left an uncomfortable question: if energy is abundant, why does everything wobble?

What Peine with Red Eléctrica and Industry

The sequence is simple to recount but hard to digest. The grid faced more renewable production than it could absorb or export. With Portugal causing problems, the usual solution was to reduce industrial demand. Hours earlier, a wind storm had put the system on alert due to issues with the wind turbines themselves. Two warnings on the same day.

Two opposing narratives coexist here. One argues that generation is excessive and the system cannot manage it. The other claims the opposite: that during storms, turbines shut down for safety, creating a production deficit. The debate remains open, and almost everything else depends on it.

800 Hours at Zero Price and Solar Selling at €35.75/MWh

The annual figures clarify the chaos. 2025 accumulated around 800 hours with zero or negative prices, equivalent to 9.1% of the year giving away electricity. In other words, for nearly a full month spread out in short bursts, energy had no value or cost money to produce.

Solar photovoltaics bear the brunt. Their captured price remained at €35.75/MWh because their panels produce exactly when everyone else does. This is the classic problem of temporal coincidence: the more capacity installed, the less revenue per unit. Renewables are dying of success. And the grid is congested: 386 saturated access nodes and 165 GW of blocked capacity. Requests that fit nowhere.

Why Does the Bill Rise If Electricity Is Worth Zero?

This is the hardest point to accept. Wholesale prices can drop to zero or negative while final bills continue to grow, because consumers do not pay only for energy. They pay for installed renewable capacity—subsidies, guarantees of income—whether the wind blows or not. They pay for backup capacity, combined-cycle plants, and engines that must be ready if renewables fail. And they pay for decoupling costs when the market breaks due to oversupply.

Some summarize it bluntly: it is a schizophrenic system, rewarding both overproduction and the grid needed to cover it when that production disappears.

Backup That Charged for Being Ready But Was Not There

Here lies the most uncomfortable criticism, directed at previous blackout episodes. According to this view, spinning reserve—the turbines that must be running to enter within minutes and are paid for via bills—was disconnected, because the prevailing criterion was that they were never used. When needed, they were absent. The ENTSO-E report is cited to support this, and defenders ask for correction if better data exists.

In contrast, the technological thesis suggests power will not be lacking, but excessive. Batteries are dropping in price to the point where moving electricity from surplus hours to shortage hours makes sense several times a day. The nuance lies in distinguishing power (GW) from manageable energy (GWh): a battery farm delivers high power for short durations, and real costs are determined by cycles, not megawatts.

Can Renewable Excess Be Exported to Europe?

This question reappears frequently. The answer hits a physical bottleneck: according to calculations circulating online, the connection with France is around 2,000 MVA, whereas about 30,000 MVA would be needed to place such a surplus. With that pipe, the excess stays inside.

From this arise two repeated solutions: industrializing the excess—using it locally in factories and heating—or storing it. Regarding storage, the example revived is reversible dams, which pump water uphill when energy is abundant and release it when needed. They exist, work, and are barely mentioned.

Total: a country capable of giving away electricity for 800 hours and going dark the next. The good news is that one does not have to choose; with this market design, both happen on the same day.