Energy storage batteries in Larral (Zaragoza): environmental report approved for 26.74 MW

Key data

The Larral photovoltaic plant, located in the province of Zaragoza and operated by Planta Solar OPDE 8 SL, reaches a new milestone in its development: the General Directorate of Quality and Environmental Assessment has issued a favorable simplified environmental impact report to incorporate a battery storage system of 26.74 MW into its existing 40 MW photovoltaic infrastructure. The resolution, dated September 7, 2026 and published in the BOE on September 18, opens the door to project execution without the need for ordinary environmental assessment, a result that significantly accelerates administrative timelines.

What does this regulation establish?

The resolution formalizes the result of the simplified environmental assessment procedure for the project called "Battery storage infrastructure 'Larral Hybridization'". The key technical and environmental elements are as follows:

The process has included consultations with more than 20 organizations, and the selected location alternative deliberately avoids protected areas, hydraulic public domain and livestock trails, which has been decisive in obtaining the favorable report without the need for ordinary assessment.

Economic and operational impact

For the promoter and for the energy sector in Aragón, this favorable report has immediate practical consequences:

• Project unblocking: The absence of ordinary assessment eliminates an administrative phase that can extend between 6 and 18 additional months in projects of this magnitude, accelerating return on investment.
• Defined execution timeline: With an estimated horizon of 11 months, the battery system could be operational in the third or fourth quarter of 2027, depending on the effective start of works.
• Reduced land footprint: The occupation of only 1.20 hectares for 26.74 MW of storage reflects the high energy density of modern battery systems, minimizing environmental impact and land acquisition costs.
• Short evacuation infrastructure: The connection via an underground line of just 147 meters to the Peñarral 132/30 kV substation reduces civil works costs and risks of environmental impact during construction.
• Obligation to incorporate prescriptions: The promoter must integrate into the execution project all conditions imposed by the consulted organizations, which may involve technical adjustments and additional costs not quantified in the resolution.

Who does it affect?

• Planta Solar OPDE 8 SL: Direct project promoter. Must now draft the execution project incorporating prescriptions from consulted organizations.
• Aragón Administration: Involved in monitoring and controlling compliance with environmental report conditions.
• Zaragoza Province Administration: Competent in territorial planning and local execution control.
• Energy storage sector companies: This project is a reference for future hybridizations of photovoltaic plants with batteries in Aragón and Spain, as it establishes a precedent for favorable simplified assessment.
• Network operators and Peñarral substation managers: Must coordinate the connection of the new system to the existing 132/30 kV infrastructure.

Practical example

Imagine that Planta Solar OPDE 8 SL begins battery system works in January 2027, once the execution project is drafted with all prescriptions incorporated. With an estimated timeline of 11 months, the 26.74 MW storage system would be operational approximately in November or December 2027.

During that period, the Larral photovoltaic plant (40 MW) would continue operating normally, as the battery infrastructure is installed on an additional area of 1.20 hectares and connected via an underground line of 147 meters that does not interfere with existing operation. Once hybridized, the plant will be able to store energy during high generation hours and feed it to the grid during periods of higher demand or price, improving its operational profitability.

This hybridization model —existing photovoltaic plant + batteries on adjacent land + short connection to already operational substation— is precisely what the simplified environmental assessment has validated as low impact, and can serve as a guide for other promoters in similar situations.

What should companies do now?

1. If you are the promoter (OPDE 8 SL): Draft the execution project incorporating all prescriptions from the more than 20 consulted organizations. This is the prior and essential requirement to begin works.
2. If you have a photovoltaic plant in Aragón and are studying hybridization: Analyze whether your location meets the criteria that have allowed simplified assessment in Larral: outside protected areas, hydraulic public domain and livestock trails. This can save you between 6 and 18 months of processing.
3. If you are a storage system provider: This project confirms active demand for hybridization in Aragón. Contact promoters of existing photovoltaic plants in the region to explore opportunities.
4. If you are a network manager or substation coordinator: Plan for the future connection of the Larral system to the Peñarral 132/30 kV substation in your capacity planning for 2027.
5. If you are an environmental advisor or consultant: Document the criteria of the alternative selected in Larral (absence of impact on protected areas, hydraulic domain and livestock trails) as a reference for future similar hybridization projects.

Official source

View complete regulation at 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-2026-19474