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Germany mulls 2045 climate neutrality in building law

  • Spanish Market: Electricity, Hydrogen, Natural gas
  • 06/07/26

Germany's federal government has proposed an amendment to the country's Building Modernisation Act (GModG), targeting the use of only climate-neutral fuels in the building sector by 2045 through a green gas and heating oil quota.

The amendment introduces section 42a, requiring the introduction of a new law by 1 December to oblige heating oil and gas suppliers to gradually switch to climate-friendly fuels — renewable or low-carbon — so that by 2045 only these are used to heat buildings.

The draft law does retain the "biotreppe" (bio-ladder) framework, with a rising share of climate-neutral sources in new heating installations starting at 10pc in 2029, and continuing to 15pc in 2030, 30pc in 2035 and 60pc in 2040. Biomethane, bio-oil, biogenic liquefied petroleum gas and green, blue, orange and turquoise hydrogen, including derivatives, count towards the quota. The amendment defines bio-oil for the first time.

Although the bio-ladder ends with a 60pc share in 2040, the new green gas and heating oil quota would make fossil-fuel heating virtually impossible from 2045.

A wider range of options are also being considered to meet the quota, including green fuels, solar thermal systems and ventilation systems with heat recovery. Hybrid systems combining a heat pump and fossil-fuel boiler can also qualify under certain technical conditions.

The amendment contains detailed rules around documentation. Company declarations as well as expert reports will count as proof of compliance. Energy suppliers must confirm on invoices that fuels meet legal requirements. Documents must be kept for years and made available to authorities on request.

The draft GModG had drawn criticism in recent months. The Left party announced that it had filed an urgent complaint with the Federal Constitutional Court on 3 July to block the law before the summer recess because of the speed of the process, despite missing information on the law's impact.

The government plans to pass the law this week in second and third readings before the summer recess, but it is not yet on the Bundestag's public agenda.


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