Favorable environmental report for Telesto 2 and 3 batteries: what solar developers must do

Key data

The developers of the Telesto 2 and Telesto 3 photovoltaic parks in Guadalajara have received environmental clearance to install their battery storage systems. The Resolución de 17 de marzo de 2026 of the Dirección General de Calidad y Evaluación Ambiental issues a favorable environmental impact report, unlocking access to the administrative authorizations required to build these hybridization infrastructures.

Without this report, no energy storage project of these characteristics can advance in Spain. Obtaining it marks the beginning of the final stage of the administrative process prior to construction.

What does this regulation establish?

The resolution issues the environmental impact report for two energy hybridization projects in the province of Guadalajara. The projects consist of installing battery storage systems associated with the already existing photovoltaic parks Telesto 2 and Telesto 3, along with part of their evacuation infrastructure.

Hybridization allows solar energy that is generated but not consumed in real time to be stored in batteries and fed into the grid during periods of peak demand. This improves the efficiency of the electricity system and contributes to grid stability.

The favorable environmental report is an essential prerequisite for obtaining the required administrative authorizations. Without it, the project cannot advance to the construction phase.

Economic and operational impact

For developers, this favorable report has a direct and immediate operational impact: it unlocks access to the administrative authorizations that allow construction of the storage installations to begin.

From a business perspective, battery hybridization has significant implications:

• Revenue improvement: The ability to store energy and manage it during periods of peak demand allows for optimized electricity sales on the market, accessing higher prices during peak hours.
• Grid stability: The installations contribute to electricity system balancing services, which can generate additional income from balance services.
• Ongoing regulatory compliance: The environmental conditions established in the resolution must be maintained throughout the entire useful life of the project, which entails long-term environmental monitoring and control costs.
• Alignment with national objectives: Hybridization projects contribute to energy transition and decarbonization goals, which may facilitate access to green financing or future incentives.

Failure to comply with the environmental conditions set out in the resolution may jeopardize administrative authorizations already obtained or under processing, with direct consequences for the operation and revenues of the project.

Who is affected?

• Developers of the Telesto 2 and Telesto 3 parks: Directly affected. They must comply with the environmental conditions of the resolution throughout the entire useful life of the installations.
• Renewable energy sector in Guadalajara: This type of resolution sets the standard for environmental requirements for similar projects in the province.
• National electricity sector: Storage installations impact the electricity market and grid stability.
• Investors and financiers of renewable projects: The favorable report is a key milestone in the project maturation process, relevant to investment decision-making.
• Legal and environmental advisors in the energy sector: They must be familiar with the specific conditions established in the resolution in order to properly advise their developer clients.

Practical example

A developer managing the Telesto 2 and Telesto 3 photovoltaic parks in Guadalajara needed the favorable environmental report in order to apply for the administrative construction authorizations for its new battery storage installations.

With the resolution of 17 March 2026, that requirement is now met. The company can now advance in the administrative process toward the construction phase. However, from the first day of operation and throughout the entire useful life of the installations, it must maintain compliance with all environmental conditions set out in the resolution. This involves establishing an internal environmental monitoring system, documenting compliance with each condition, and being prepared for inspections or requirements from the competent authority.

If the company fails to comply with any of the established environmental conditions, it risks having the administrative authorizations already obtained jeopardized, with the consequent impact on the operation and revenues of the project.

What should companies do now?

1. Review the environmental conditions of the resolution in detail: Read the Resolución de 17 de marzo de 2026 in full to identify all specific obligations applicable to Telesto 2 and Telesto 3.
2. Initiate the administrative authorization process: With the favorable environmental report in hand, proceed without delay to apply for the authorizations required for the construction of the storage installations.
3. Establish an environmental monitoring system: Design internal procedures to ensure compliance with environmental conditions throughout the entire useful life of the project, not only during the construction phase.
4. Document compliance from the outset: Record all actions related to environmental conditions in order to be able to demonstrate compliance to the administration at any time.
5. Coordinate with legal and environmental advisors: Ensure that the legal and environmental team is fully aware of the exact content of the resolution and can provide support in ongoing compliance management.

Official source

Disclaimer: This article is for informational purposes only and does not constitute legal advice. For specific decisions, please consult a qualified professional. Source: https://www.boe.es/diario_boe/txt.php?id=BOE-A-2026-6958