Data Centers: 12 GW Granted vs. 4 GW Forecast

Spain Grants 12 GW for Data Centers, Triple the Forecast

The Spanish electricity grid is being sized for a business that, for now, does not exist. The government estimates that by 2030, data centers will require between 3.5 and 4 GW of power. More than 12 GW has already been granted. Red Eléctrica (Spain's grid operator) authorized over 6 GW on its own since late 2023, and distributors allocated the rest. The uncomfortable conclusion: someone is paying for capacity that is not yet in use.

How much electrical power has already been granted for data centers in Spain?

Over 12 GW, three times the official forecast for 2030 and far above the 6 GW that Red Eléctrica authorized since late 2023. These numbers come from the system itself: government forecast of 3.5 to 4 GW, administrative grants more than triple that. Some see it as reasonable anticipation of a growing sector; others argue the grid will be over-dimensioned for nothing, with costs socialized. The mention of scarcity as an excuse to inflate prices appears as soon as these figures are cross-referenced with electricity bills.

GW is not GWh: the unit error that invalidates half the debate

Part of the discussion mixes up magnitudes, and it's not a minor detail: installed capacity is measured in GW and energy generated in GWh, so comparing one with the other invalidates any conclusion. With 30 GW installed, nothing is known if the figure for how many annual GWh are produced is missing. The technical correction leaves the essential point standing: committed capacity comfortably exceeds what the official plan itself estimates for consumption.

The stress test: the hour when solar generates nothing

On January 16, 2025, between 8:00 PM and 9:00 PM, hourly demand reached 39.957 GW. In that breakdown, photovoltaics contributed 0 GWh, while combined cycle provided 10,639 and hydropower 7,719. When the sun sets, the grid relies on gas, nuclear, and water. Adding data centers to that equation without expanding backup is not electrification: it's turning off other people's lights.

Electrification is necessary, no one seriously disputes that. What is debated is the pace, the permits, and who assumes the risk if the business doesn't materialize. And there's a detail mentioned in passing that explains a lot: while it lasts, the sector feeds many people in very different professions. Forecast with reservations: capacity will continue to grow faster than the demand that justifies it.