The Gebäudeenergiegesetz requires gas heating systems to run on a rising share of renewable gas: 15% from 2029, climbing to 60% by 2040. For building owners and the utilities supplying them, that is not distant policy. It is a procurement question with a fixed start date.
Biomethane is the one answer that changes nothing in the building. The boiler stays, the grid connection stays, the radiators stay. What changes is the certificate attached to the gas.
The practical difficulty is volume and duration. A 15% quota across a portfolio is a meaningful annual commitment, and it rises every few years. Buying it spot, one year at a time, exposes you to a market that is tightening.
bGX sources GEG-eligible biomethane and structures supply over the horizon the law actually sets — not the one the spot market offers.
Read the full guide: GEG biomethane for German heating