Glauco Almacena energy storage plant: 55 MW authorized in Girona

Key data

Energía Glauco SL has received prior administrative authorization for the Glauco Almacena storage plant, with 55,384 MW of installed capacity in the municipalities of Vilademuls and Sant Julià de Ramis, in the province of Girona. The resolution, signed on April 21, 2026 by the General Directorate of Energy Policy and Mines, was published in the BOE on May 16, 2026.

This authorization is the first formal step in the administrative process. Without it, it is not possible to advance toward construction or operation of the installation. The project also includes the evacuation infrastructure necessary to connect the plant to the electrical grid.

What does this regulation establish?

The resolution grants Energía Glauco, SL the prior administrative authorization for the energy storage plant called Glauco Almacena. This authorization covers two elements of the project:

• The energy storage plant, with 55,384 MW of installed capacity.
• The evacuation infrastructure necessary to connect the installation to the electrical grid.

Prior administrative authorization is the first link in a three-phase process that, in Spain, must be completed by all generation and energy storage installations of significant scale:

1. Prior administrative authorization (this resolution): certifies project viability and allows advancement to the next step.
2. Administrative construction authorization: allows work to begin.
3. Operating authorization: allows operation of the installation and injection of energy into the grid.

The resolution reflects the progress of Spanish energy policy toward decarbonization and electrical grid flexibility, two central axes of the National Integrated Energy and Climate Plan (PNIEC).

Economic and operational impact

Energy storage plants of this scale have a direct impact at several levels of the electrical system and energy market:

• Grid stability: A 55,384 MW plant can absorb renewable generation surpluses and release them during periods of high demand, reducing the need for backup energy from fossil sources.
• Renewable integration: Storage is the necessary complement for solar and wind energy to be manageable. Without storage capacity, surpluses are lost or generate imbalances in the grid.
• Electricity market: Storage plants can participate in system adjustment services, generating additional revenue for the operator and reducing costs for the system as a whole.
• Local impact: The construction and operation of the plant will generate economic activity in the municipalities of Vilademuls and Sant Julià de Ramis, both during construction and operation phases.

From a regulatory perspective, obtaining prior authorization reduces project uncertainty and allows the promoter to advance in financing, detailed design, and equipment procurement.

Who does it affect?

• Energía Glauco, SL: project promoter, directly obligated to complete the following phases of the administrative process before starting work.
• Municipalities of Vilademuls and Sant Julià de Ramis (Girona): territories where the installation will be located, with urban planning, environmental, and economic implications.
• Electrical system operators: the new storage capacity modifies grid management in the area of influence.
• Storage project promoters: this resolution is a reference for the administrative process applicable to similar installations in Spain.
• Renewable energy sector companies: the advancement of storage projects facilitates the integration of new renewable capacity into the grid.

Practical example

Imagine a renewable energy company with a solar park in the province of Girona that generates surpluses during central hours of the day, but cannot inject them into the grid due to capacity restrictions. The entry into operation of a storage plant like Glauco Almacena, with 55,384 MW capacity, would allow it to absorb those surpluses, store them, and release them during peak demand hours.

For this to be possible, Energía Glauco SL must still complete two additional phases: obtain construction authorization and, after the works, operating authorization. Only then can the plant operate and connect to the grid through the evacuation infrastructure included in this project.

This process illustrates why prior administrative authorization, although only the first step, is a relevant signal for the market: it indicates that the project has passed the first regulatory filter and has formal viability to advance.

What should companies do now?

1. If you are a storage project promoter: review the three-phase administrative process (prior authorization, construction, and operation) and ensure you have documented technical and environmental viability before requesting prior authorization.
2. If you operate in the electricity market in Girona or neighboring areas: monitor the progress of the Glauco Almacena project, as its entry into operation will modify grid management capacity in the area.
3. If you are a construction company or storage equipment supplier: identify bidding opportunities that will arise in the following project phases, once construction authorization is obtained.
4. If you are an energy advisor or consultant: use this resolution as a reference for the regulatory process applicable to large-scale energy storage installations in Spain.
5. If you are an investor or financier: obtaining prior authorization reduces the regulatory risk of the project and is a relevant milestone for investment evaluation.