Key data
| Regulation | Resolution of April 16, 2026, from the Directorate General for Energy Policy and Mines |
|---|---|
| BOE Publication | May 2, 2026 |
| Effective date | April 16, 2026 |
| Holder company | Parques Eólicos San Lorenzo, SLU |
| Authorized installation | San Lorenzo B photovoltaic solar module — 39,288 MW |
| Associated wind farm | San Lorenzo B wind farm — 39,375 MW (already operational) |
| Affected municipalities | Castromonte, Peñaflor de Hornija and Torrelobatón (Valladolid) |
| Category | Energy / Renewables |
| Declaration of public utility | Yes, included in the resolution |
Parques Eólicos San Lorenzo, SLU can now begin construction of its photovoltaic solar module in Valladolid after obtaining both prior administrative authorization and administrative construction authorization. The Resolution of April 16, 2026 from the Directorate General for Energy Policy and Mines formalizes a project that combines two complementary renewable technologies on already existing evacuation infrastructure.
The strategic key to this project is not just the installed capacity, but the model: leveraging the grid connection of an operational wind farm to add solar generation without duplicating infrastructure. This hybridization approach is increasingly common in Spanish renewable development, and this resolution is a concrete example of how it is processed and authorized.
What does this regulation establish?
The resolution grants two simultaneous authorizations to Parques Eólicos San Lorenzo, SLU:
- Prior administrative authorization: Certifies project viability and allows progress in technical and administrative development.
- Administrative construction authorization: Directly enables physical execution of the installation.
Additionally, the resolution authorizes part of the evacuation infrastructure associated with the solar module, leveraging the one already existing from the San Lorenzo B wind farm.
The differentiating element is the declaration of public utility, which has two immediate practical effects:
- Facilitates occupation of the land necessary for the installation, even if there are owners who do not reach voluntary agreement.
- Expedites administrative procedures, reducing processing times compared to projects without this declaration.
| Element | Detail |
|---|---|
| Holder | Parques Eólicos San Lorenzo, SLU |
| Installation | San Lorenzo B photovoltaic solar module |
| Installed capacity | 39,288 MW |
| Hybridization technology | Photovoltaic solar + wind |
| Associated wind farm | San Lorenzo B — 39,375 MW |
| Municipalities | Castromonte, Peñaflor de Hornija, Torrelobatón |
| Province | Valladolid |
| Declaration of public utility | Yes |
| Evacuation infrastructure | Partially shared with the existing wind farm |
Economic and operational impact
Wind-solar hybridization on existing infrastructure has a direct and measurable economic impact for the developer:
- Reduction of infrastructure costs: By sharing the evacuation infrastructure of the already operational wind farm, investment in a new evacuation line and substation is avoided, which typically represents one of the largest costs of a renewable project.
- Optimization of the grid connection point: Grid access is one of the scarcest resources in renewable development in Spain. Leveraging the existing connection point of the San Lorenzo B wind farm (39,375 MW) to add 39,288 MW of solar maximizes the return on that connection.
- Complementarity of generation: Wind and solar energy have different generation profiles throughout the day and year. Hybridization allows more stable and continuous generation, improving the utilization of the evacuation point.
- Acceleration of timelines through public utility: The declaration of public utility reduces the time for land negotiation and procedures, which translates into less time until operation and, therefore, earlier revenue.
For the municipalities of Castromonte, Peñaflor de Hornija and Torrelobatón, the installation represents local economic activity during the construction phase and potential income from land leasing and local taxes during operation.
Who does it affect?
- Parques Eólicos San Lorenzo, SLU: Direct holder of the authorization. Can begin construction of the San Lorenzo B photovoltaic solar module.
- Landowners in Castromonte, Peñaflor de Hornija and Torrelobatón: The declaration of public utility affects them regarding possible occupation of their land for the installation.
- Councils of the three municipalities: Must manage local urban planning and administrative procedures arising from construction.
- Renewable energy developers in Spain: This resolution is a precedent and reference for similar hybridization projects in processing or planning.
- Network operators and evacuation infrastructure managers: Must coordinate the integration of the new solar module into the existing network.
- Investors and funds with exposure to the Spanish renewable sector: The consolidation of the hybridization model affects the valuation and planning of renewable asset portfolios.
Practical example
A renewable developer that already operates a wind farm with capacity similar to San Lorenzo B (39,375 MW) and has unused evacuation capacity at its connection point can follow the same model:
- Design a photovoltaic solar module sized to leverage available evacuation capacity (in this case, 39,288 MW).
- Request prior administrative authorization and construction authorization from the Directorate General for Energy Policy and Mines, including a request for declaration of public utility to expedite land occupation.
- Once the resolution is obtained—as in the case of San Lorenzo B, issued on April 16, 2026—construction can begin by sharing the already existing evacuation infrastructure, avoiding investment in a new line and substation.
- The result is a hybrid installation that generates during both wind and sun hours, maximizing the utilization of the grid connection point and improving the return on total asset investment.
This is exactly the model that Parques Eólicos San Lorenzo, SLU has executed with San Lorenzo B: an operational wind farm of 39,375 MW to which a solar module of 39,288 MW is added on shared infrastructure.
What should companies do now?
- If you are Parques Eólicos San Lorenzo, SLU: The authorization has been in effect since April 16, 2026. Begin land occupation procedures covered by the declaration of public utility and coordinate with the network operator the integration of the solar module into the existing evacuation infrastructure.
- If you are a landowner in Castromonte, Peñaflor de Hornija or Torrelobatón: Be aware that the declaration of public utility may affect your property. Contact the municipal authorities or the developer to understand the scope and timeline of potential occupation.
- If you are a municipal authority in any of the three municipalities: Coordinate with Parques Eólicos San Lorenzo, SLU and the regional administration to process the necessary urban planning and administrative permits. The declaration of public utility expedites procedures but does not eliminate local requirements.
- If you are a renewable developer with similar projects in planning: This resolution provides a clear procedural and technical reference for hybridization projects. Consider whether your projects could benefit from this model and prepare the necessary documentation for authorization requests.
- If you are an investor or fund manager: Monitor the progress of San Lorenzo B construction and the operational performance of the hybrid installation. This model is becoming increasingly relevant in Spanish renewable development and affects asset valuation and portfolio planning.
Frequently asked questions
Q: Can any renewable developer apply for hybridization authorization?
A: Hybridization is possible when there is existing evacuation infrastructure with available capacity. Not all projects have this advantage. The developer must demonstrate technical and economic viability and follow the standard authorization procedure.
Q: What is the practical difference between prior administrative authorization and construction authorization?
A: Prior authorization certifies viability and allows technical development. Construction authorization directly enables physical execution. Both are necessary and are often granted simultaneously, as in this case.
Q: Does the declaration of public utility mean the developer can occupy any land?
A: The declaration facilitates occupation but does not eliminate the need for negotiation or legal procedures. It does allow expropriation if necessary, which is why it is strategically important.
Q: How long does it typically take to build a 39 MW solar module?
A: Construction typically takes 12-18 months, depending on site conditions, supply chain, and weather. The declaration of public utility can reduce overall project timeline by 6-12 months by expediting land procedures.
Q: Will the San Lorenzo B hybrid installation be fully operational in 2026?
A: The authorization is from April 2026. Construction would likely begin in the following months, with completion expected in 2027-2028, depending on execution pace.
Official source
Resolution of April 16, 2026, from the Directorate General for Energy Policy and Mines, published in the Official State Gazette (BOE) on May 2, 2026.
Disclaimer: This article is for informational purposes only and does not constitute legal or professional advice. The interpretation and application of regulations may vary depending on specific circumstances. We recommend consulting with legal and technical specialists before making decisions based on this content. CambiosLegales is not responsible for damages or losses arising from the use of this information. Regulations are subject to change, and this content reflects the status as of the publication date.