26.74 MW Battery Authorized in Andorra (Teruel): Key Insights for the Renewable Sector

Key data

Planta Solar OPDE 17, SL has just obtained the two administrative authorizations it needed—prior authorization and construction authorization—to build a battery storage module of 26.74 MW in Andorra (Teruel). The module, named «Los Arcos Hybridization», will connect to the photovoltaic park «Los Arcos» (43.90 MW), already in operation, forming a hybrid solar-storage system.

The resolution, signed on September 23, 2026 and published on October 19, 2026, is one of the first cases resolved under the Royal Decree 997/2025, of November 5, which introduced a simplified procedure and exemption from environmental assessment for storage projects hybridized with existing renewables. The result: significantly shorter administrative timelines than in the ordinary procedure.

What does this regulation establish?

The resolution simultaneously grants two enabling titles to Planta Solar OPDE 17, SL:

• Prior administrative authorization: certifies project viability and allows progress in detailed design and engineering.
• Administrative construction authorization: directly enables the start of works on the storage module and its evacuation infrastructure.

The authorized technical scope includes the following elements:

The project is covered by the simplified procedure established in Royal Decree 997/2025, of November 5, on urgent measures to strengthen the electrical system. This decree allows processing the hybridization of storage with existing renewables without the need for environmental impact assessment, provided that the technical and power requirements are met. Consultation with affected administrations generated no opposition, which facilitated the favorable resolution.

Economic and operational impact

For the developer—Planta Solar OPDE 17, SL—the authorization means being able to execute the hybridization without the costs and delays associated with the ordinary environmental assessment procedure. For projects of this scale, simplified processing can reduce the administrative timeline by several months, with consequent savings in financial and opportunity costs.

From a sectoral perspective, the resolution has clear precedent value:

• Confirms that Royal Decree 997/2025 is operational and that the General Directorate of Energy Policy and Mines is effectively applying it.
• Demonstrates that battery hybridization with existing photovoltaic plants can obtain prior and construction authorization in a single resolution.
• The absence of opposition from consulted administrations reinforces the viability of the model for other developers with similar installations in Spain.

For operators of photovoltaic parks already in operation, this case opens the door to adding storage capacity without restarting the authorization process from scratch, leveraging existing evacuation infrastructure (in this case, the SET Los Arcos 30/132 kV).

Who does it affect?

• Developers of existing photovoltaic parks studying the addition of battery storage to hybridize their installation.
• Energy storage sector companies (manufacturers, integrators, engineering) working on hybridization projects in Spain.
• Investors and infrastructure funds with positions in renewable assets in Spain, especially in Aragón and areas with high photovoltaic penetration.
• Legal and technical advisors processing energy authorizations under Royal Decree 997/2025.
• Local and regional administrations in Teruel and Aragón involved in the mandatory consultation of energy projects.
• Network managers and electrical system operators who must integrate the new storage capacity into network planning.

Practical example

Imagine a developer operating a 50 MW photovoltaic park in Aragón, with its own substation and grid connection point already authorized. It wants to add a 20 MW battery module to optimize the generation curve and improve its income in the electricity market.

Before Royal Decree 997/2025, that developer had to initiate an ordinary procedure: environmental impact assessment, consultations with multiple agencies, possible objections and timelines that could exceed 18-24 months.

Following the precedent of «Los Arcos Hybridization», the same developer can use the simplified procedure: without environmental assessment, with consultation to administrations (which in the Los Arcos case generated no opposition) and with the possibility of obtaining prior and construction authorization in a single act. The existing evacuation infrastructure—such as the 30 kV underground line and substation adaptation—can be reused, also reducing civil works investment.

The savings in processing time and costs can be decisive for project profitability and for advancing commercial operation entry.

What should companies do now?

1. Review the portfolio of existing renewable plants: identify which operational photovoltaic installations could be candidates for hybridization with storage under Royal Decree 997/2025.
2. Verify compliance with simplified procedure requirements: check that the hybridization project fits within the assumptions for environmental assessment exemption provided in RD 997/2025.
3. Evaluate available evacuation infrastructure: analyze whether the existing substation and connection line can accommodate the additional power of the battery module, as occurs with the SET Los Arcos 30/132 kV in this case.
4. Initiate preliminary consultations with the General Directorate of Energy Policy and Mines: the precedent of «Los Arcos Hybridization» shows that processing can be resolved without opposition if the project is well documented.
5. Coordinate with legal advisors specialized in energy: correct submission of the application under the simplified procedure is key to avoiding delays and ensuring that the resolution is favorable in a single act.

Official source

Consult complete regulation in official source

Notice: This article is purely informational in nature 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-2026-21766