Spain's Gas System to Fund Renewable Gas Push With €2.689/MWh Injection Incentive

Spain's gas network users will finance the country's push into renewable gases. The Comisión Nacional de los Mercados y la Competencia (CNMC) has set a unit incentive of €2.689/MWh for the injection of gases other than natural gas — including green hydrogen and biogases — into transport and distribution grids, according to El Español. The new remuneration methodology takes effect on 1 October 2026.

The cost does not come from the General State Budget. It is folded into the regulated remuneration of the gas system and recovered through the tolls and charges paid by users of the networks.

What Circulars 4/2026 and 6/2026 set out

The two CNMC circulars turn a previously stated policy objective into concrete economic signals inside the regulated regime of the grids. The figures are as follows:

• For the 2027-2032 period, an incentive of €2.689/MWh for gases other than natural gas that are billed and injected from production plants registered under Royal Decree 376/2022 and connected to the transport grid after 30 September 2026.
• A unit incentive of the same €2.689/MWh for qualifying gases injected into distribution networks from new installations that meet the requirements of the circular.
• €1.344/MWh in other cases contemplated by the regulation — exactly half the headline rate.
• An additional €2.017/MWh for bioLNG in certain loading operations from LNG plants, where the fuel is destined for maritime use.

The gas system pays, not the Treasury

Circular 4/2026 establishes that the costs of gas transport installations and LNG plants are financed with revenue from the tolls and charges paid by network users. Circular 6/2026 applies the same principle to distribution networks. The incentive therefore sits inside the economic architecture of the gas system rather than in public spending.

That has a practical consequence for consumers: no bill will carry a separate line of €2.689 per MWh earmarked for green hydrogen. The CNMC sets the remuneration that network owners receive and states that this remuneration is financed through the income obtained from tolls and charges for the use of the installations. Circular 4/2026 also specifies that the methodology must take into account gas demand, the economic and financial balance of the system, and the competitiveness of final gas supply prices for consumers.

Not a hydrogen-only premium

The CNMC does not use the term "green hydrogen" when it sets the €2.689/MWh figure. The regulatory concept is "other gases different from natural gas", provided they come from plants registered under Royal Decree 376/2022 and meet the stated conditions. In practice the measure is an incentive for bringing new molecules into the gas system as part of the decarbonisation and renewable gas strategy, not a premium reserved for hydrogen. Biomethane and other biogases qualify on the same terms, and the separate bioLNG provision points specifically at marine fuel supply.

Spain has an extensive gas infrastructure, and the government intends part of it to play a role in the transition to an energy system less dependent on fossil fuels. The political orientation that preceded the circulars already contemplated that the remuneration methodology could include measures to encourage the injection of renewable gases, and it pointed to the possibility of mechanisms related to hydrogen transport and distribution infrastructure. Producing renewable hydrogen is not enough on its own; the infrastructure to move and deliver it has to be built or adapted.

The open question: the size of the bill

How much this will ultimately cost consumers cannot be calculated from the circulars alone. The impact depends on the volume of gas that ends up being incentivised, on how gas demand evolves, and on the total remuneration of the system. What the circulars do establish is the direction: the development of new renewable molecules in Spain will carry a regulated cost component, and part of that cost will be channelled through the gas networks that consumers use and pay for.