17.5 MW Battery in A Coruña: what it means for the renewable sector in 2026

Key data

Enel Green Power España, SL, can now proceed with the construction of Tesouro Storage, a battery storage installation of 17.5 MW that will be integrated with the Tesouro wind farm of 50.4 MW in As Pontes de García Rodríguez (A Coruña). The Resolution of September 29, 2026 from the General Directorate of Energy Policy and Mines grants both prior administrative authorization and administrative construction authorization, published in the BOE on October 19, 2026.

This project does not start from scratch: it leverages access and connection permits already granted at the Puentes G.R. 400 kV substation of Red Eléctrica de España, which significantly reduces project timelines and administrative complexity.

What does this regulation establish?

The resolution grants Enel Green Power España two simultaneous authorizations for the Tesouro Storage project:

• Prior administrative authorization: recognizes the project's viability from an energy perspective and its fit within the electrical system planning.
• Administrative construction authorization: enables the effective start of works and installations.

The authorized infrastructure includes the following technical elements:

The file was submitted for consultation to multiple agencies. The Dirección Xeral de Saúde Pública questioned whether an additional environmental assessment was necessary, but the promoter ruled out this need under the Law 21/2013 on environmental assessment, with no agency presenting decisive opposition to the project.

Economic and operational impact

Wind-battery hybridization is one of the business models with the greatest projection in the Spanish energy sector. It allows the promoter to optimize the use of network access permits already granted, avoiding the processing of new connection points, which is one of the main bottlenecks in renewable development in Spain.

For Enel Green Power España, the operational advantages are direct:

• Reuse of the existing evacuation infrastructure of the Tesouro wind farm.
• Guaranteed access to the Puentes G.R. 400 kV substation without the need to process new connection permits.
• Ability to store wind energy during periods of low demand and release it to the grid during periods of high demand or price, improving asset profitability.
• Competitive positioning in the market for electrical system adjustment services, where storage has increasing economic value.

For the sector as a whole, this authorization consolidates the regulatory framework for hybridization projects in Spain and reinforces the signal that the Administration supports this type of investment without requiring new environmental assessments when the project correctly complies with Law 21/2013.

Who does it affect?

• Enel Green Power España, SL: direct promoter and holder of the granted authorizations.
• Promoters of wind farms in Galicia and Spain studying hybridization with storage: this resolution is an applicable precedent for similar projects.
• Companies in the energy storage sector (battery manufacturers and integrators) participating in the project supply chain.
• Network operators and managers of the Puentes G.R. 400 kV substation (Red Eléctrica de España), who must coordinate the expansion of the existing substation.
• Energy advisors and consultants managing wind-battery hybridization files before the General Directorate of Energy Policy and Mines.
• Investors and renewable infrastructure funds evaluating wind assets in Spain with hybridization potential.

Practical example

A wind farm promoter with an operating park with access and connection permits already granted can follow the Tesouro Storage model to add storage capacity without processing a new grid connection point.

In the specific case of Tesouro: the wind farm has 50.4 MW of installed capacity. The authorized battery represents 34.7% of that capacity (17.5 MW out of 50.4 MW). This means that, at times of maximum generation, the battery can absorb approximately one-third of the park's production to release it later when market price or system needs are more favorable.

The key to the file is that the promoter avoided an additional environmental assessment by invoking Law 21/2013, which significantly expedited the processing. Any promoter in a similar situation should analyze whether their project meets the assumptions of that law before initiating the file, as it can mean months of difference in authorization timelines.

What should companies do now?

1. Review existing access and connection permits in own wind farms: if already granted, they are the basis for processing a battery hybridization without the need for new network permits.
2. Analyze the technical feasibility of hybridization in installations with spare evacuation capacity, calculating the optimal ratio between wind power and battery power.
3. Verify compliance with Law 21/2013 before initiating the administrative file, to determine whether the project requires additional environmental assessment and plan timelines accordingly.
4. Identify the connection substation and coordinate with Red Eléctrica de España the conditions for necessary expansion, as has been done in Tesouro with the Puentes G.R. 400 kV substation.
5. Prepare technical documentation for the simultaneous application for prior administrative authorization and construction authorization before the General Directorate of Energy Policy and Mines, following the model of this file.
6. Monitor similar resolutions published in the BOE to identify applicable administrative precedents for own projects in process.

Official source

Consult complete regulation at official source

Notice: 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-2026-21769