Spain raises proposed data center renewable threshold above 10 MW

By Elena Vasquez

Spain has raised the capacity threshold in its proposed data-center renewable-power mandate to more than 10 MW, up from 1 MW in the initial proposal. The revision narrows the rules' direct scope, but it does not lower the 80% renewable-share target for facilities that remain covered.

The revised framework still requires renewables to supply at least 80% of a covered facility's energy in every operating hour. It also allows a transition period of up to five years to reach that threshold, subject to several conditions.

Which facilities now fall under the mandate?

The revised rules apply to data centers with capacity above 10 MW. The initial proposal, first reported by Bloomberg, covered installations of 1 MW or higher, so the new threshold leaves facilities at or below 10 MW outside this mandate.

For developers, that is the clearest immediate market effect: fewer sites sit inside the renewable-power rules. Larger facilities still face an hourly supply obligation, a 36-month matching window and a conditional five-year transition path.

How do the matching deadlines change?

Every new megawatt of energy used by a data center must be matched by a new megawatt of installed renewable capacity. The original rule counted renewable installations made in the 18 months before operations began; the revised window covers 36 months.

The longer window gives developers more time to secure the matching capacity before a facility starts operating. The revision also extends the time developers have to demonstrate renewable-energy use and commitments.

The revised rules also place no limit on solar power. That leaves solar without a stated cap within the new rules.

Does the 80% hourly target still stand?

The 80% hourly target remains in place. Spain has left the end-state requirement unchanged at a minimum 80% renewable share for every hour of operation. The proposal offers compliance relief through timing rather than through a lower percentage.

The transition can reach five years where the proposal's conditions are met. During that path, operators must still plan around an hourly supply standard, rather than a full-year or annual-average calculation.

The compliance unit remains each operating hour, rather than an annual total. The transition changes the schedule for reaching the threshold, not the stated 80% destination.

What does this mean for Spain's pipeline?

More than 10 GW of data-center projects in Spain are seeking grid connections. Spain is becoming a key European location for data centers, with ample land and high renewable generation potential supporting new proposals.

Against that pipeline, the narrower threshold reduces the number of facilities directly subject to the mandate. Projects above 10 MW still need to plan for 80% hourly renewable coverage, a matching window stretching 36 months backward from operation and a possible five-year transition.

The change therefore alters the compliance burden across the pipeline. Smaller sites fall out of this specific requirement, while larger projects gain more time to bring renewable assets and supporting commitments into place.

Which projects are moving?

Several new data-center proposals have emerged in Spain in recent months. Earlier this month, Omani renewable energy firm O-Green announced plans for a data-center project in Zaragoza.

The Zaragoza proposal adds another named development to the recent wave. The announcement came amid a broader pipeline of more than 10 GW of projects seeking grid connections.

What should developers and operators check?\n

• Capacity: A facility must exceed 10 MW to fall within the revised threshold.
• Matching: Each new MW requires new renewable MW installed within 36 months before operation.
• Hourly supply: A covered facility needs at least 80% renewable supply each hour, with up to five years to comply under applicable conditions.
• Solar: No limit applies to solar power under the revised rules.