Iberdrola installs 27.64 MW batteries in Teruel: key insights for the renewable sector

Key data

The renewable sector has a new regulatory reference: the General Directorate of Energy Policy and Mines has granted Iberdrola Renovables Aragón, SAU prior administrative and construction authorization for the BESS Hybridization FV Teruel project, a battery storage system of 27.64 MW that will be integrated with the already operational photovoltaic plant FV Teruel (42.56 MW) in Azaila (Teruel). The resolution, published on October 20, 2026 in the BOE with reference BOE-A-2026-21858, enters into force on the same day of its publication.

What is relevant is not just the project itself: it is the model it validates. Hybridizing storage with existing solar generation, leveraging already operational evacuation infrastructure, is consolidated as a regulatory viable path without mandatory environmental impact assessment.

What does this regulation establish?

The resolution grants two simultaneous authorizations to Iberdrola Renovables Aragón:

• Prior administrative authorization for the BESS Hybridization FV Teruel project.
• Administrative construction authorization for the same project and for part of its evacuation infrastructure.

The authorized technical elements include:

• Battery storage system (BESS) with 27.64 MW installed power.
• Underground lines at 30 kV for system integration.
• Expansion of the existing substation linked to the FV Teruel plant.
• Use of already operational evacuation infrastructure, without the need for a new grid connection.

A relevant regulatory fact: the project was exempted from environmental impact assessment as it does not fall within the scope of the Law 21/2013 on environmental assessment. This significantly simplifies the administrative process and reduces processing times.

For administrative and grid permission purposes, the total power of the hybrid installation is computed as 70.2 MW (sum of 42.56 MW solar and 27.64 MW storage).

Economic and operational impact

For Iberdrola Renovables Aragón, hybridization allows optimizing the return on existing evacuation infrastructure: instead of building a new grid connection for the BESS, the one already installed for FV Teruel is reused. This reduces infrastructure investment costs and shortens time to market.

From the perspective of the electricity market, adding 27.64 MW of storage to a 42.56 MW solar plant allows:

• Shifting generation to time slots with higher prices in the wholesale market.
• Reducing energy spillage during periods of low demand.
• Offering flexibility and balancing services to the system operator (REE), with potential for additional revenue.
• Improving capacity firmness declared to Red Eléctrica de España.

For the renewable sector as a whole, the resolution sets a precedent: solar-BESS hybridization on existing infrastructure is processable without environmental impact assessment (under Law 21/2013) and with direct administrative authorization from the General Directorate of Energy Policy and Mines.

Who does it affect?

• Iberdrola Renovables Aragón, SAU: direct holder of the authorization and responsible for executing the BESS Hybridization FV Teruel project.
• Promoters of existing photovoltaic plants evaluating adding storage: this resolution is a processing reference applicable to similar projects.
• BESS project developers in Spain: the hybridization model with existing evacuation is regulatory validated.
• Energy advisors and consultants accompanying storage authorization processes: must know the criteria applied in this resolution.
• CFOs and operations directors of renewable sector companies in Aragón and the rest of Spain: impact on investment planning and asset strategy.
• Electricity market operators managing solar generation assets with hybridization capacity.

Practical example

A developer company that has an operational photovoltaic plant of similar power to FV Teruel (around 40-50 MW) and wants to add a BESS system can take this resolution as a roadmap:

• If the plant already has a substation and operational evacuation infrastructure, it does not need to request a new grid connection for the BESS: it can process the hybridization on the existing connection.
• If the BESS project does not exceed the thresholds of Law 21/2013, it may be exempted from environmental impact assessment, reducing processing time and cost.
• The total power to declare to the administration and Red Eléctrica will be the sum of solar power plus BESS power: in Iberdrola's case, 42.56 MW + 27.64 MW = 70.2 MW.
• The additional authorized infrastructure includes underground lines at 30 kV and substation expansion, elements that must be considered in the construction project.

What should companies do now?

1. Review the portfolio of existing solar plants to identify which ones have evacuation infrastructure with available capacity suitable for BESS hybridization.
2. Analyze whether planned BESS projects fall outside the scope of Law 21/2013 to determine if they can be processed without environmental impact assessment, reducing timelines and costs.
3. Prepare technical documentation (BESS power, evacuation lines, substation expansion) following the processing model validated in this resolution before the General Directorate of Energy Policy and Mines.
4. Calculate total hybrid power (generation + storage) for grid permission requests to Red Eléctrica de España, as established by this resolution (70.2 MW in the reference case).
5. Consult with advisors specialized in energy regulation to verify that the specific project meets the requirements applied in BOE-A-2026-21858 and can adopt the same processing model.

Official source

View complete regulation in official source

Disclaimer: This article is for informational purposes only and does not constitute legal advice. For specific decisions, consult a qualified professional. Source: https://www.boe.es/diario_boe/txt.php?id=BOE-A-2026-21858