176 MW Battery in Toledo: Authorization for Khons Sun Power and What It Means for the Renewable Sector

Key data

Khons Sun Power, SL receives approval to build the battery energy storage system Tagus 2 HBESS, with 176.44 MW installed capacity, alongside its Tagus 2 photovoltaic plant of 224.4 MW in the Toledo municipalities of Ocaña and Ontígola. The Resolution of September 14, 2026 from the General Directorate of Energy Policy and Mines, published in the BOE on October 16, 2026, grants both prior administrative authorization and construction authorization in a single act.

What is relevant for the sector is not just the project itself: it is that this resolution confirms that the abbreviated procedure introduced by RD 997/2025 for storage hybridization works in practice, with exemption from environmental assessment and reduced deadlines.

What does this regulation establish?

The resolution grants two simultaneous authorizations to Khons Sun Power, SL:

• Prior administrative authorization: legally enables the battery energy storage project.
• Administrative construction authorization: allows the Tagus 2 HBESS system works to begin.

The project consists of hybridizing the battery with the existing or pending Tagus 2 photovoltaic plant, so that both installations share the same evacuation infrastructure. Evacuation will be carried out through already authorized infrastructure, connecting with the Arganda 220 kV substation of Red Eléctrica.

A relevant operational aspect: the network access capacity will be distributed proportionally among all holders sharing the evacuation position. This means that Khons Sun Power must coordinate with other users of that network node.

Economic and operational impact

For the promoter, the accelerated processing under RD 997/2025 has a direct impact on costs and timelines: the exemption from environmental assessment eliminates one of the most costly and time-consuming bottlenecks in the authorization process for energy facilities in Spain.

The fact that evacuation uses already authorized infrastructure also reduces investment in network civil works and minimizes the regulatory risk associated with new lines or substations.

For the sector as a whole, this resolution has precedent value:

• It confirms that the RD 997/2025 procedure is applicable and functional for large-scale hybridization projects.
• It demonstrates that it is possible to obtain both authorizations (prior and construction) in a single administrative act for this type of project.
• The absence of objections in public information and the approval of all consulted bodies reinforce the solidity of the case as a replicable model.

The proportional distribution of access capacity among holders sharing evacuation is a factor that promoters must incorporate into their financial models: available capacity is not exclusive and may be affected by new projects connecting to the same node.

Who does it affect?

• Khons Sun Power, SL: direct promoter, with authorization to build the 176.44 MW Tagus 2 HBESS battery.
• Promoters of photovoltaic plants with pending hybridization projects: this resolution is the first reference case under RD 997/2025 at this scale.
• Investors and energy infrastructure funds: the acceleration of timelines improves return visibility and reduces processing risk.
• Operators sharing the evacuation position at the Arganda 220 kV substation: access capacity will be distributed proportionally.
• Legal and technical advisors in the energy sector: must know the new RD 997/2025 procedure to correctly advise their clients on hybridization projects.
• Local administrations of Ocaña and Ontígola (Toledo): affected by the territorial implementation of the project.

Practical example

A promoter who has a 200 MW photovoltaic plant already authorized in Spain and wants to add a battery energy storage system to hybridize it can now use the RD 997/2025 procedure, as Khons Sun Power has done with Tagus 2.

In practice, this means:

• Requesting prior administrative authorization and construction authorization in a single file, without the need for separate environmental impact assessment.
• Taking advantage of the already authorized evacuation infrastructure of the existing solar plant, avoiding the need to process a new line or substation.
• Assuming that network access capacity at the evacuation point will be distributed proportionally if there are other holders at that node — a key factor for correctly sizing the battery capacity and its economic viability.

The Tagus 2 HBESS case (176.44 MW battery over 224.4 MW solar) represents a storage-to-generation ratio of approximately 79%, which provides a concrete reference for the sizing that the administration has considered acceptable in this case.

What should companies do now?

1. Review if you have authorized photovoltaic plants susceptible to hybridization: RD 997/2025 opens an accelerated route that can significantly reduce processing timelines and costs for adding storage.
2. Analyze the available access capacity at your evacuation point: if you share a node with other holders, proportional distribution may limit the effective battery capacity. Quantify this before sizing the project.
3. Verify if your hybridization project meets the requirements of RD 997/2025 to benefit from the environmental assessment exemption and deadline reduction.
4. Prepare the case with a view to public information: the Tagus 2 case received no objections, which reinforces the importance of solid technical documentation from the start.
5. Coordinate with Red Eléctrica and sector bodies to obtain prior approval that facilitates a favorable resolution, as occurred in this case.

Official source

View complete regulation at official source

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-2026-21605