Spain is set to mandate a gradual increase in the share of biomethane in natural gas, starting at 0.5% in 2028 and rising to 6% in 2036, according to a draft proposal by the country's Ministry for Ecological Transition and the Demographic Challenge.
The proposal aimed at promoting energy independence, job creation, and decarbonization is now open for public consultations, with a deadline of June 11, 2026.
Under the proposal, biomethane would qualify for the quota only if certified through guarantees of origin for renewable gases.
The draft decree also proposes amendments to existing natural gas infrastructure rules, including those governing reverse-flow equipment and direct-connection lines used to inject renewable gases into the gas grid.
Once commissioned, direct lines connecting production facilities to the gas network would have to be transferred to the relevant transporter or distributor, becoming part of the broader gas system and subject to third-party access requirements.
The proposal would also allow other producers, consumers or distribution networks to use the infrastructure where deemed more efficient, with compensation mechanisms envisaged for project developers.