Key data
| Regulation | Resolution of 6 May 2026, from the General Directorate of Energy Policy and Mines |
|---|---|
| Publication | 18 May 2026 |
| Entry into force | Not specified |
| Affected parties | Enagás Transporte SAU and landowners in San Millán de los Caballeros (León) |
| Category | Energy |
| Year | 2026 |
| Authorized installation | New position O-07X with measurement station G-65 |
| Affected infrastructure | Zamora-Benavente-León pipeline |
| Municipality | San Millán de los Caballeros (León) |
| Authorization holder | Enagás Transporte, SAU |
Spain's natural gas transport network takes a concrete step towards the integration of renewable gases. The Resolution of 6 May 2026 from the General Directorate of Energy Policy and Mines grants Enagás Transporte, SAU administrative authorization, approval of the execution project and declaration of public utility to install a new biomethane connection position on the Zamora-Benavente-León pipeline, in the municipality of San Millán de los Caballeros (León).
This resolution, published on 18 May 2026 in the BOE, does not affect Spanish companies in general, but has direct implications for landowners in the affected area, for biomethane producers seeking injection points in the gas network, and for the energy sector as a whole in the context of decarbonization.
What does this regulation establish?
The resolution grants three simultaneous authorizations to Enagás Transporte SAU for the same project:
| Authorization | Content |
|---|---|
| Administrative authorization | Formal permission to execute the installations of the new position O-07X project with measurement station G-65 |
| Approval of the execution project | Technical validation of the construction project for the biomethane connection to the Zamora-Benavente-León pipeline |
| Declaration of public utility | Authorization to occupy the necessary land in San Millán de los Caballeros (León), facilitating expropriations or easements over private properties |
The project is formally named «Annex to the Zamora-Benavente-León pipeline. New position O-07X with measurement station G-65 for biomethane injection». Position O-07X is the physical connection point to the existing pipeline, and measurement station G-65 is the infrastructure that will monitor and certify the volume of biomethane injected into the network.
This action is part of the decarbonization policy of the Spanish gas system and the promotion of renewable gases, allowing biomethane produced in the area to circulate through the same infrastructure as conventional natural gas.
Economic and operational impact
This resolution does not generate direct costs for companies outside the project. Its economic and operational impact is concentrated in three areas:
- For Enagás Transporte SAU: It obtains complete legal authorization to execute the installation works of position O-07X and station G-65. Without this resolution, the connection could not materialize. The resolution does not specify the investment amount.
- For landowners in San Millán de los Caballeros (León): The declaration of public utility is the legal mechanism that allows Enagás to initiate forced expropriation procedures or impose easements of passage over private properties necessary for the works. Affected owners have the right to compensation, but cannot block project execution.
- For biomethane producers in the area: The new position O-07X creates an injection point in the transport network that did not previously exist, opening the possibility of connecting biomethane production facilities to the Zamora-Benavente-León pipeline in León.
From a sectoral perspective, the integration of biomethane into Enagás's transport network is a necessary step for this renewable gas to compete and complement natural gas in the Spanish energy system.
Who does it affect?
- Enagás Transporte, SAU: Authorization holder and responsible for executing the installation works of position O-07X and measurement station G-65.
- Landowners in San Millán de los Caballeros (León): Directly affected by the declaration of public utility, which authorizes the occupation of their properties for the execution of the works.
- Biomethane producers and developers in Castilla y León: The new connection to the Zamora-Benavente-León pipeline opens an injection route in the transport network for biomethane production facilities in the area.
- Gas and energy sector in general: This resolution is an example of progress in the integration of renewable gases into existing gas infrastructure, with implications for planning similar connections in other areas of Spain.
Practical example
A biomethane producer operating a biogas plant in the province of León who wants to inject its production into the natural gas transport network needs, as a prerequisite, an authorized connection point to exist on the nearest pipeline.
Until now, the Zamora-Benavente-León pipeline did not have a biomethane injection position in the San Millán de los Caballeros area. With the authorization of the position O-07X and measurement station G-65, Enagás Transporte SAU can build that connection infrastructure. Once operational, a biomethane producer could request network access through that point, with station G-65 certifying the volume and quality of the injected gas.
For landowners affected in San Millán de los Caballeros: if their property is on the project route, the declaration of public utility means that Enagás can initiate the occupation procedure. They should check if they have received notification of the expropriation file and, if applicable, exercise their right to fair compensation within the deadlines established by forced expropriation legislation.
What should companies do now?
- Landowners in San Millán de los Caballeros (León): Verify if your property is included in the expropriation or easement file associated with this project. If you have received notification, review the deadlines for submitting objections or agreeing on compensation valuation.
- Biomethane producers in Castilla y León: Identify if the new position O-07X of the Zamora-Benavente-León pipeline is a viable injection point for your facility. Contact Enagás Transporte to learn about the technical and administrative requirements for network access at that point.
- Biomethane project developers in the planning phase: Incorporate the existence of this new connection in León in the feasibility analysis of new plants, as proximity to an authorized injection point in the transport network is a key factor for project profitability.
- Advisors and consultants in the energy sector: Update the map of biomethane injection points in Enagás's network with this new position O-07X in San Millán de los Caballeros (León), published in the BOE on 18 May 2026.