Solaria's 48.5 MW Battery in Burgos: Authorization and Project Keys

Key data

Solaria Promoción y Desarrollo Fotovoltaico, SLU, can now begin construction of its battery storage module "Agrupación Maira Beta" in La Vid de Bureba (Burgos). The General Directorate of Energy Policy and Mines has granted, through a resolution of October 22, 2026 (published in the BOE on November 9, 2026), both prior administrative authorization and administrative construction authorization in a single administrative act.

The battery, with 48.50 MW of installed power, will be hybridized with the photovoltaic plant "Agrupación Maira Beta" of 140.127 MW, already previously authorized. This type of hybridization—storage + photovoltaics—allows optimizing energy injection into the grid, reducing spillage and improving park remuneration.

What does this regulation establish?

The resolution authorizes the project in its two key administrative phases and defines the necessary evacuation infrastructure. The authorized technical elements are:

From an environmental perspective, the project passed the simplified environmental impact assessment with a favorable result, which means it was not necessary to submit the project to the ordinary procedure (longer and more costly). However, mandatory environmental conditions are imposed:

• Archaeological control during works
• Plantings of native species
• Faunal prospecting prior to the start of work

Additionally, the Nuclear Safety Council issued a favorable report with mandatory technical conditions for the promoter.

Economic and operational impact

For Solaria, this authorization unlocks the construction phase of a strategic asset. Battery-photovoltaic hybridization has a direct impact on the park's financial results:

• Spillage reduction: the battery allows storing energy during low demand hours and releasing it during higher price hours, improving average revenue per MWh.
• Evacuation capacity optimization: by sharing evacuation infrastructure (30 kV lines and SE La Vid 220/30 kV substation), the grid connection cost is distributed between the photovoltaic and storage.
• Access to adjustment services market: batteries of this scale (48.50 MW) can participate in REE regulation and reserve markets, generating additional revenue.

For the sector as a whole, this project is a relevant precedent: it demonstrates that the simplified environmental impact assessment route is viable for storage projects hybridized with already-authorized photovoltaics, which can significantly shorten administrative timelines for similar projects.

Who does it affect?

• Solaria Promoción y Desarrollo Fotovoltaico, SLU: direct promoter, responsible for compliance with all imposed environmental and technical conditions.
• Municipality of La Vid de Bureba and surroundings (Burgos): affected by construction works, 30 kV underground lines and substation expansion.
• Storage project promoters in Spain: the project sets a precedent on the simplified environmental procedure for hybridized batteries.
• Network operators and REE: connection to the Barcina 400 kV node implies technical coordination with the system operator.
• Investors and renewable sector analysts: the authorization confirms the advancement of Solaria's storage pipeline in Spain.

Practical example

A photovoltaic promoter who already has an authorized plant of more than 100 MW and wants to add storage can take this project as a procedural reference:

Solaria had the "Agrupación Maira Beta" plant of 140.127 MW authorized. When requesting hybridization with a 48.50 MW battery, it chose the simplified environmental impact assessment route—instead of the ordinary procedure—and obtained a favorable result. This allowed it to receive in a single act both prior authorization and construction authorization, avoiding a second round of processing.

The imposed conditions (archaeological control, faunal prospecting and native plantings) are customary measures and manageable within the construction budget of a project of this scale. The Nuclear Safety Council's technical conditions add specific requirements that the promoter must integrate into the executive project before starting work.

What should companies do now?

1. If you are Solaria or its technical team: integrate the Nuclear Safety Council's technical conditions into the executive project before starting work. It is mandatory.
2. Conduct faunal prospecting before beginning any earthwork: it is an environmental condition prior to works, not simultaneous.
3. Contract archaeological control: it must be operational throughout the entire construction phase, not just at the beginning.
4. Plan native species plantings with sufficient advance notice to meet the deadlines set by the resolution.
5. If you are a promoter of a similar project: analyze whether your battery can be covered by the simplified environmental impact assessment route by hybridizing with an already-authorized photovoltaic. This file is a useful precedent for your processing.
6. If you are an investor or analyst: update Solaria's storage pipeline: this project adds 48.50 MW of battery capacity in Burgos, hybridized with 140.127 MW photovoltaic.

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-2026-23495