Key data
| Regulation | Resolution of July 22, 2026, from the Directorate General for Quality and Environmental Assessment — EIA Maira Delta and Maira Gamma Wind Park Groupings |
|---|---|
| BOE Publication | August 15, 2026 |
| Entry into force | August 15, 2026 |
| Promoter | Solaria Promoción y Desarrollo Fotovoltaico SLU |
| Total approved capacity | 175 MW wind (70 MW Maira Delta + 105 MW Maira Gamma) |
| Wind turbines | 25 total (10 Maira Delta + 15 Maira Gamma) |
| Location | Burgos Province (north), surrounding municipalities |
| Evacuation infrastructure | SET Barcina-Garoña 400 kV (shared with photovoltaic facilities) |
| Key regulatory milestone | September 19, 2026 (RDL 23/2020) |
| Category | Energy / Environmental Assessment |
| Official source | BOE-A-2026-17822 |
Solaria has received environmental approval to build two wind parks in northern Burgos with a combined capacity of 175 MW. The Resolution of July 22, 2026 from the Directorate General for Quality and Environmental Assessment, published in the BOE on August 15, 2026 (BOE-A-2026-17822), formalizes the favorable EIA for the "Maira Delta Grouping" and "Maira Gamma Grouping" parks, as well as their shared evacuation infrastructure.
The strategic key to this project is hybridization: the wind parks are integrated with photovoltaic facilities from the same grouping that already had favorable EIA since 2022, optimizing the use of evacuation infrastructure to the Barcina-Garoña substation at 400 kV.
What does this regulation establish?
The EIA environmentally approves two wind parks with the following technical characteristics:
| Park | Capacity | Wind turbines | Prior photovoltaic EIA |
|---|---|---|---|
| Maira Delta Grouping | 70 MW | 10 | Favorable since 2022 |
| Maira Gamma Grouping | 105 MW | 15 | Favorable since 2022 |
Both parks share evacuation infrastructure to the SET Barcina-Garoña 400 kV with the photovoltaic facilities already environmentally authorized. The EIA processing included:
- Public consultations prior to the evaluation process
- Reports from the Junta de Castilla y León
- Report from the Ministry of Defense
- Clarifications on possible impact to La Rioja territory
A relevant fact from the process: the promoter voluntarily renounced modifying three wind turbine positions to avoid compromising compliance with the administrative milestone of September 19, 2026 established by the Royal Decree-Law 23/2020. This decision reflects the time pressure that exists on renewable projects with binding regulatory deadlines.
The EIA is not unconditional: its execution is subject to compliance with corrective measures regarding fauna, habitats and natural heritage in the affected municipalities of northern Burgos.
Economic and operational impact
For the renewable sector, this EIA has clear strategic value: it unlocks the construction of 175 MW of wind power at a time when RDL 23/2020 deadlines are decisive for maintaining grid access and connection permits.
The most relevant operational aspects are:
- Hybridization as an efficiency lever: by sharing evacuation infrastructure with the already-approved photovoltaic facilities, Solaria optimizes investment in grid connection, one of the highest costs in renewable projects.
- Milestone of September 19, 2026: RDL 23/2020 sets administrative deadlines for projects with grid access and connection permits. Failing to meet them can result in the expiration of such permits, with loss of investment made in processing.
- Environmental constraints: corrective measures on fauna, habitats and natural heritage involve additional monitoring and execution costs that the promoter must budget before starting work.
- Renunciation of three wind turbine positions: this decision, although marginally reducing potential capacity, was strategically correct to avoid losing the regulatory milestone.
Who does it affect?
- Solaria Promoción y Desarrollo Fotovoltaico SLU: direct promoter, with obligations to comply with environmental constraints and the September 19, 2026 milestone.
- Municipalities in northern Burgos: affected by the physical implementation of the 25 wind turbines and evacuation infrastructure.
- Renewable energy sector: reference for hybrid wind-solar model with shared infrastructure, replicable in other projects.
- Promoters with projects under RDL 23/2020: Solaria's decision to renounce modifications to meet the milestone is a clear signal of the rigidity of these deadlines.
- Involved administrations: Junta de Castilla y León, Ministry of Defense and, where applicable, La Rioja administration, in their respective roles of reporting and monitoring.
- Environmental and engineering services companies: contractors that will execute the corrective measures required by the EIA.
Practical example
A promoter of a similar wind project in Castilla y León, with 15 wind turbines and 105 MW capacity (equivalent to Maira Gamma), faces the same dilemma as Solaria: weeks before the RDL 23/2020 milestone, they detect that they could improve the arrangement of three wind turbines to optimize production.
The decision that Solaria made in this case was to renounce that modification. The reason: any change in wind turbine positions requires a new round of consultations or reports that, in practice, cannot fit into the calendar before September 19, 2026. Missing that milestone can mean the expiration of the grid access and connection permit, which invalidates years of processing and millions of euros of prior investment.
The lesson for the sector: in projects with binding regulatory milestones, technical optimization must be subordinated to compliance with the administrative calendar. One less megawatt of potential capacity is an acceptable cost compared to the loss of the connection permit.
What should companies do now?
- If you are Solaria or a linked contractor: immediately review the plan of corrective measures required by the EIA regarding fauna, habitats and natural heritage, and allocate resources and budget before starting work.
- Verify compliance with the September 19, 2026 milestone: with the EIA already published on August 15, the margin is just over a month. Identify what administrative steps remain pending and prioritize them.
- If you are a promoter of another project under RDL 23/2020: review your own administrative milestones and assess whether any pending technical modification could compromise the calendar. Solaria's decision is a clear precedent.
- Renewable sector companies with hybrid projects: analyze the wind-solar hybridization model with shared infrastructure as a reference to optimize evacuation costs in your own projects.
- Administrations and environmental consultants: take note of the constraints imposed in this EIA (fauna, habitats, natural heritage in northern Burgos) as a reference for similar projects in the area.
Frequently asked questions
What is the total capacity of the Maira Grouping wind parks approved in Burgos?
The two parks total 175 MW of wind capacity: Maira Delta Grouping with 70 MW and 10 wind turbines, and Maira Gamma Grouping with 105 MW and 15 wind turbines. Both are hybridized with photovoltaic facilities from the same grouping that already had favorable EIA since 2022.
What is the September 19, 2026 milestone of RDL 23/2020 and why is it so important?
Royal Decree-Law 23/2020 sets administrative deadlines for renewable projects with grid access and connection permits. Failing to meet the September 19, 2026 milestone can result in the expiration of such permits, with the consequent loss of investment made in processing. That is why Solaria renounced modifying three wind turbine positions: any change would have delayed the EIA beyond that date.
Is the EIA of the Maira parks unconditional or does it have additional requirements?
The EIA is favorable but conditioned. The execution of the parks is subject to compliance with corrective measures on fauna, habitats and natural heritage in the affected municipalities of northern Burgos. The promoter must execute and accredit these measures before and during construction.
Why do the wind parks and photovoltaic facilities of Maira share evacuation infrastructure?
Hybridization allows both the wind parks (approved now) and the photovoltaic facilities (with EIA since 2022) to share the same evacuation infrastructure to the SET Barcina-Garoña 400 kV. This significantly reduces grid connection costs, one of the largest in large-scale renewable projects.
What organizations participated in the processing of the EIA of the Maira parks?
The processing included public consultations, reports from the Junta de Castilla y León, report from the Ministry of Defense and clarifications on possible impact to La Rioja territory. The final resolution was issued by the Directorate General for Quality and Environmental Assessment on July 22, 2026 and published in the BOE on August 15, 2026.
Official source
Consult complete regulation in official source (BOE-A-2026-17822)
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-2026-17822