55 MW BESS Plant in Vall d'Uixó: Authorization and Obligations for Soner Picasso SLU

Key data

Soner Picasso, SLU has the green light to build one of the most significant battery storage plants in the Valencian Community. The Resolution of September 7, 2026 from the General Directorate of Energy Policy and Mines formalizes prior administrative authorization for the Cuevas BESS plant, with 55.176 MW of installed capacity, located in Vall d'Uixó (Castellón). The authorization is not unconditional: the promoter must comply with a specific set of technical, environmental and urban planning requirements before being able to operate.

What does this regulation establish?

The resolution grants prior administrative authorization —the first step in the process of enabling electrical installations under Royal Decree 1955/2000— for the Cuevas BESS storage plant. The approved infrastructure includes the following elements:

The project passed the simplified environmental impact assessment without needing to undergo the ordinary procedure, which significantly expedited the timelines. However, the authorization is conditioned on the implementation of specific preventive measures and the submission of the following studies:

• Acoustic study of the installation
• Archaeological study of the affected area
• Air quality study

Additionally, the landscape integration of the project was already validated by the Generalitat Valenciana, and the promoter must respect the urban planning requirements set by the Municipality of Vall d'Uixó, as well as the agreement signed with the Irrigation Community of the area.

Economic and operational impact

For Soner Picasso, SLU, this prior authorization represents the unblocking of a major investment in energy storage infrastructure. However, effective commissioning depends on meeting all the requirements before requesting the next authorizations in the process (construction authorization and commissioning).

From an operational perspective, the main cost and management focuses are:

• Mandatory technical studies: acoustic, archaeological and air quality studies, which must be commissioned and executed before advancing in the process.
• Urban planning coordination: compliance with the requirements of the Municipality of Vall d'Uixó, which may involve design or construction schedule adjustments.
• Management of the agreement with the Irrigation Community: the already signed agreement must remain active and be executed according to the terms agreed during the entire construction and operation phase.
• Risk of new procedure due to modifications: any relevant change to the original project will require initiating a new substantive procedure in accordance with RD 1955/2000, with the consequent impact on timelines and costs.

For the energy sector in Castellón and the Valencian Community, the approval of a BESS plant of this capacity strengthens local storage capacity and can contribute to grid stabilization during periods of high renewable generation.

Who does it affect?

• Soner Picasso, SLU: direct promoter, responsible for meeting all authorization requirements.
• Municipality of Vall d'Uixó: must verify compliance with its own urban planning requirements during the construction process.
• Generalitat Valenciana: has validated landscape integration and maintains environmental supervision competencies.
• Irrigation Community of the area: signatory party to the agreement linked to the authorization.
• Red Eléctrica de España: connection point for the 220 kV evacuation line.
• Companies in the energy storage and BESS sector: reference for regulatory precedent for similar projects in Spain.

Practical example

Soner Picasso, SLU already has the prior administrative authorization in hand. The next concrete step is to commission the three mandatory studies —acoustic, archaeological and air quality— before requesting the construction authorization, which is the second milestone in the regulatory process under RD 1955/2000.

Suppose that during the detailed design phase the promoter decides to increase the installed capacity or modify the route of the 220 kV evacuation line. In that case, it is not enough to notify the administration: the resolution expressly establishes that any substantive modification requires initiating a complete new administrative procedure, with the timelines and costs that this entails. That is why detailed engineering must be finalized before making any changes to the authorized project.

What should companies do now?

1. Commission the mandatory studies: acoustic, archaeological and air quality. They are a sine qua non condition to advance to the next procedure. The sooner they are initiated, the lower the risk of delays.
2. Review and execute the agreement with the Irrigation Community: ensure that the agreed terms are met on time and in full during the entire construction phase.
3. Coordinate with the Municipality of Vall d'Uixó: identify and document compliance with each urban planning requirement before starting work.
4. Freeze the project design: avoid substantive modifications to the authorized project to avoid having to initiate a new procedure under RD 1955/2000.
5. Prepare the construction authorization request: once compliance with prior requirements is demonstrated, proceed with the next step of the regulatory process.
6. Monitor the energy storage regulatory framework: the BESS sector is in active regulatory evolution in Spain; any change may affect the timelines or commissioning requirements.

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-2026-22213