53 MW Solar Photovoltaic Plant in Zaragoza: Hybridization with Wind and Key Insights for the Sector

Key data

Molinos del Ebro SA has received prior administrative authorization for the El Llano Solar Photovoltaic Plant, with 53.32 MW of installed capacity, together with a battery storage module of 5 MW, in Rueda de Jalón, Zaragoza. The resolution, signed on March 31, 2026 by the Directorate General for Energy Policy and Mines and published in the BOE on April 18, 2026, also authorizes the evacuation infrastructure necessary to hybridize this new facility with the existing El Llano wind farm, which has 49.95 MW of capacity.

This project is not just another authorization: it establishes a hybridization model that the renewable sector can replicate to accelerate new developments by leveraging already connected assets.

What does this regulation establish?

The resolution grants Molinos del Ebro SA prior administrative authorization for three differentiated elements that form a single integrated project:

The key to the project is hybridization: the new solar plant and storage system share the already authorized and operational evacuation infrastructure of the wind farm. This means that it is not necessary to build a new evacuation line or obtain a new connection point to the electrical grid, two of the most costly and time-consuming bottlenecks in the development of renewable projects in Spain.

Prior administrative authorization is the first formal step in the process of enabling an electrical generation facility in Spain, prior to construction authorization and operating authorization. Its granting validates the administrative and technical feasibility of the project.

Economic and operational impact

The hybridization model has direct economic and operational consequences for the promoter and serves as a reference for the sector:

• Reduction of infrastructure costs: By sharing the existing evacuation of the El Llano wind farm (49.95 MW), Molinos del Ebro SA avoids investment in a new evacuation line and costs associated with a new grid access point.
• Streamlining of procedures: Hybridization over already authorized infrastructure simplifies the administrative process, reducing the usual processing times for new renewable projects.
• Optimization of grid connection use: The combination of solar generation (daytime) and wind (variable, with higher nighttime and wind period production) allows more efficient use of the shared evacuation point, maximizing hours of grid injection.
• Storage as a flexibility element: The 5 MW of batteries add energy management capacity, allowing injection to the grid to be shifted to moments of higher market value.
• Contribution to energy transition objectives in Aragón: The project strengthens installed renewable capacity in the autonomous community, aligning with the objectives of the National Integrated Energy and Climate Plan (PNIEC).

Who does it affect?

This resolution directly and indirectly affects the following actors:

• Molinos del Ebro SA: Direct promoter. Must advance in the following phases of the enabling process (construction and operating authorization).
• Renewable energy promoters with existing farms: Any company with an authorized wind or solar farm in Spain can study hybridization as a way to add new capacity with lower costs and procedures.
• Energy sector advisors and consultants: The model applied at El Llano is a useful precedent for structuring new hybridization projects before the Directorate General for Energy Policy and Mines.
• Investors in renewable assets in Spain: Hybridization improves the profitability profile of existing assets by adding capacity with lower infrastructure investment.
• Local and regional administrations in Aragón: The project has an impact on the territory of Rueda de Jalón and contributes to regional energy objectives.

Practical example

A promoter operating a 50 MW wind farm in Aragón with its own evacuation infrastructure wants to expand its renewable portfolio. Instead of developing a completely new solar project—with the costs of obtaining a new grid access point, building a new evacuation line, and facing a complete administrative process from scratch—it can request hybridization of its existing farm with a solar photovoltaic plant.

Following the model of Molinos del Ebro SA at El Llano, this promoter could add up to 53 MW of solar and 5 MW of storage by sharing already authorized evacuation. The result: more installed capacity, lower infrastructure investment, and more agile processing before the Directorate General for Energy Policy and Mines.

The 5 MW storage system also allows management of combined solar-wind generation peaks, avoiding spillage and maximizing electricity market revenues.

What should companies do now?

1. Evaluate if you have hybridizable renewable assets: If you operate a wind or solar farm with its own evacuation infrastructure, analyze whether the available capacity at your connection point allows adding new solar generation or storage without exceeding authorized limits.
2. Review the hybridization model applied at El Llano: Consult the complete resolution in the BOE to understand the technical and administrative requirements that the Directorate General for Energy Policy and Mines has validated in this case.
3. Calculate infrastructure savings: Quantify the cost avoided by not needing a new evacuation line or new grid access point. This data is key to the financial viability of the hybridization project.
4. Begin prior administrative authorization processing: If the analysis is favorable, prepare the technical and environmental documentation necessary to request prior authorization from the Directorate General for Energy Policy and Mines.