GModG in force: the bio-step applies, the green gas quota is to follow.

What has changed

• Bio-step: anyone who installs a new gas, oil or LPG heating system since entry into force must use a rising share of climate-friendly fuels from 2029: 10 percent from 2029, 15 percent from 2030, 30 percent from 2035 and 60 percent from 2040.
• The owner is obligated. The obligation is met through the supplier’s gas product.
• Green gas quota: for the existing stock, a quota for gas suppliers is planned that covers only volumes supplied to household customers. According to the key points, it is to start at 1 percent in 2028 and rise to 100 percent by 2045.

What is still open

The draft bill for the green gas quota is due by 1 December 2026. Until then, the form of evidence, crediting, penalties and the relationship to the bio-step are not finally settled. In particular, it is open whether and how the green gas quota can be credited against the bio-step. The quota values so far only come from the economics ministry’s key points.

What suppliers should do now

• Prepare gas products with a defined bio share for customers with newly installed heating systems.
• Determine the household volumes subject to the quota and plan compliance from 2028.
• Set up procurement and the balancing group so that volumes can be allocated per customer.
• Choose systems that can be adapted to the final requirements.

How this works operationally is described on our Buildings & heat market page and on the “Heat is getting greener” page. Heat is getting greener

This article provides context and is not legal or tax advice. As of October 2026.