Key data
| Regulation | Resolution of July 31, 2026, DGPEM — BESS Authorization GES (Gestenia Energía, SL) |
|---|---|
| BOE Publication | August 19, 2026 |
| Entry into force | Not specified in the resolution |
| Beneficiary company | Gestenia Energía, SL |
| Authorized BESS power | 39.6 MW |
| Associated solar plant | Photovoltaic park «GES», 46.2 MW |
| Location | Alcalá de Guadaíra (Seville) |
| Applicable regulatory framework | RD 997/2025 — simplified procedure for hybridizations |
| Evacuation | Underground line 30 kV to Don Rodrigo substation 400 kV |
| Category | Energy |
The Spanish renewable sector has a practical case on the table that changes the rules of the game: Gestenia Energía, SL has just obtained prior administrative authorization and construction authorization to hybridize its photovoltaic park «GES» with a battery storage module of 39.6 MW in Alcalá de Guadaíra (Seville). The resolution, signed on July 31, 2026 by the General Directorate of Energy Policy and Mines, was published in the BOE on August 19, 2026.
What is relevant is not just the authorization itself: it is the path that has been followed to obtain it. The project is covered by the simplified procedure of RD 997/2025, which allows hybridizing storage installations with existing renewable plants without undergoing environmental impact assessment, provided that certain conditions are met. No consulted administration presented opposition and no comments were received during the public information period.
What does this regulation establish?
The resolution grants two simultaneous authorizations to Gestenia Energía, SL:
- Prior administrative authorization: recognizes the viability of the project and its fit within energy planning.
- Administrative construction authorization: enables the start of construction of the BESS module and its evacuation infrastructure.
The project consists of the hybridization of the existing photovoltaic park «GES» (46.2 MW) with the new battery storage module called «BESS GES» (39.6 MW). The generated and stored energy will be evacuated via an underground line at 30 kV to the Don Rodrigo substation, 400 kV, taking advantage of already existing evacuation infrastructure.
The most relevant regulatory element is the application of RD 997/2025, which establishes a specific simplified procedure for storage hybridizations. This regulation exempts this type of project from environmental impact assessment when certain conditions are met, significantly reducing timelines and administrative burden compared to the ordinary procedure.
| Project element | Detail |
|---|---|
| Name of BESS module | BESS GES |
| Installed BESS power | 39.6 MW |
| Associated solar plant | Photovoltaic park «GES» |
| Solar plant power | 46.2 MW |
| Type of hybridization | Battery storage alongside existing photovoltaic |
| Evacuation infrastructure | Underground line 30 kV to Don Rodrigo substation 400 kV |
| Environmental assessment | Exempt, under assumptions of RD 997/2025 |
| Comments received | None (public information period) |
| Opposition from administrations | None |
Economic and operational impact
For Gestenia Energía, hybridization with a 39.6 MW BESS radically transforms the business model of its solar plant: it allows storing energy during high generation hours and releasing it to the grid at times of higher prices, improving average revenue per MWh and reducing dependence on spot prices during solar hours.
From the sector's perspective, the most relevant impact is the consolidation of RD 997/2025 as a real and operational route. This case demonstrates that the simplified procedure works: processing without environmental assessment, without opposition from administrations and without citizen comments. For promoters with existing photovoltaic plants, this means that adding storage is now faster and more predictable than before.
The use of existing evacuation infrastructure (the 30 kV line and the connection to Don Rodrigo 400 kV) also reduces investment costs and eliminates one of the main bottlenecks in renewable development: access to the grid.
Who does it affect?
- Gestenia Energía, SL: direct beneficiary of the authorization.
- Promoters of existing photovoltaic parks in Spain: with operating plants that want to add BESS storage through hybridization.
- Developers of energy storage projects: interested in learning about the simplified procedure of RD 997/2025 and its application conditions.
- Investors and renewable energy funds: that evaluate photovoltaic assets with hybridization potential in Andalusia and the rest of Spain.
- Legal and technical advisors in the energy sector: who must process similar authorizations for their clients.
- Regional and local administrations: as a reference for how these projects are processed at the state level under the new regulatory framework.
Practical example
Suppose a developer company has a 50 MW photovoltaic plant in operation in Andalusia, with access to an existing substation and available evacuation capacity. It wants to add a 40 MW BESS module to improve its revenue curve.
Before RD 997/2025, this project would have required initiating an ordinary energy authorization procedure, including environmental impact assessment, with timelines that could exceed 2-3 years. With the simplified procedure of RD 997/2025, and following the path taken by Gestenia Energía with its «BESS GES» of 39.6 MW, the company can:
- Avail itself of the exemption from environmental assessment if it meets the assumptions of RD 997/2025.
- Take advantage of existing evacuation infrastructure (such as the 30 kV underground line already in service).
- Obtain prior and construction authorization in a single accelerated procedure.
- Avoid comments and administrative opposition if the project is designed correctly from the start.
The Alcalá de Guadaíra case is the proof of concept: 39.6 MW of BESS authorized alongside 46.2 MW of existing photovoltaic, with evacuation to Don Rodrigo 400 kV substation, without environmental assessment and without opposition. A replicable model.
What should companies do now?
- Review whether your existing photovoltaic plant meets the assumptions of RD 997/2025 to avail itself of the simplified BESS hybridization procedure. Not all installations are automatically eligible.
- Audit the available evacuation capacity at your current connection point: if you already have access to a substation with available capacity, the process is significantly simplified, as occurs with the connection to Don Rodrigo 400 kV in this case.
- Size the BESS module in relation to the installed photovoltaic power: in this project, the BESS (39.6 MW) represents 85.7% of the solar plant's power (46.2 MW), which can be a proportionality reference for other projects.
- Initiate prior consultation with the General Directorate of Energy Policy and Mines to confirm the project's fit within the simplified procedure before investing in detailed engineering.
- Prepare technical and legal documentation in advance: although the procedure is simplified, the resolution requires prior and construction authorization, with all associated technical documents.
Frequently asked questions
What is the simplified procedure of RD 997/2025 for BESS hybridizations?
RD 997/2025 establishes an accelerated procedure for authorizing the hybridization of battery storage modules (BESS) with existing renewable installations. Its main advantage is that, under certain assumptions, it exempts the project from undergoing environmental impact assessment, significantly reducing processing timelines. The case of Gestenia Energía in Alcalá de Guadaíra is the first example published in BOE of application of this procedure.
What power does the BESS authorized to Gestenia Energía in Alcalá de Guadaíra have?
The battery storage module called «BESS GES» has an installed power of 39.6 MW. It will be hybridized with the photovoltaic park «GES», which has 46.2 MW of installed power. Evacuation will be carried out via underground line at 30 kV to Don Rodrigo substation, 400 kV.
Does a BESS project hybridized with existing solar require environmental impact assessment?
Not necessarily. RD 997/2025 provides for exemption from environmental assessment for storage hybridizations under certain assumptions. In the case of Gestenia Energía, the project availed itself of this exemption and no consulted administration presented opposition, nor were any comments received during the public information period.
What evacuation infrastructure is used in the BESS GES project in Seville?
The project takes advantage of existing infrastructure: an underground line at 30 kV that connects to the Don Rodrigo substation, 400 kV. The use of already existing infrastructure is one of the factors that facilitates simplified processing and reduces the project's investment costs.
Can my company replicate this BESS hybridization model in another autonomous community?
RD 997/2025 is applicable at the state level, so the simplified procedure is available throughout the national territory, not just in Andalusia. However, each project must meet the specific assumptions of the regulation to avail itself of the exemption from environmental assessment. It is recommended to consult with the General Directorate of Energy Policy and Mines before initiating processing.
Official source
Consult complete regulation in official source (BOE-A-2026-17938)
Notice: 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-2026-17938