Berlin – Germany’s efforts to overhaul its building energy standards are facing continued delays, creating uncertainty for homeowners, the construction industry, and climate goals. The planned update to the Gebäudeenergiegesetz (GEG), now slated to be renamed the Gebäudemodernisierungsgesetz (GMG), has been stalled for months, leaving key questions unanswered about the future of heating technology and energy efficiency requirements. The delay stems from disagreements within the governing coalition between the CDU/CSU and SPD parties regarding the implementation of renewable energy targets for heating systems.
At the heart of the debate is the requirement that heating systems, under certain conditions, operate with a 65% share of renewable energy. While the coalition agreement stipulated the abolition of the “heating law” and a move towards a more technology-open and flexible approach, a clear path forward remains elusive. The CDU/CSU favors prioritizing CO2 avoidance within buildings as the central metric for regulation, while the SPD cautions against weakening the existing standards and potentially undermining climate protection efforts in the building sector.
The uncertainty is already impacting the market. According to data cited by the German Heating Industry Federation (BDH) and the Central Association for Sanitary Heating and Climate Technology (ZVK), heating equipment sales have been steadily declining for nearly two years. In 2024, sales were halved compared to the previous year, with a further 19% drop recorded through August 2025. The industry has the capacity to modernize over one million heating systems annually, but requires clear policy signals to encourage investment and consumer confidence. The current situation is creating a “limbo” that is discouraging both consumers and businesses.
Shifting Sands: From 65% Target to CO2-Based Metrics
The original GEG mandated that new heating systems in new building areas utilize at least 65% renewable energy sources, a rule that came into effect on January 1, 2024. The proposed GMG seeks to revise this, with the CDU/CSU advocating for a system based on achievable CO2 reductions within buildings. This shift has raised concerns among environmental groups, who argue that a weakening of the 65% target could jeopardize Germany’s climate goals. A legal opinion commissioned by Greenpeace and Gaswende, released on February 2, 2026, questions the constitutionality of reducing the renewable energy quota, citing the “climate decision” of the German Federal Constitutional Court in 2021, which established the Paris Climate Goals as the benchmark for climate protection in Germany. The German Federal Constitutional Court affirmed that the Paris Climate Goals are the constitutional standard for climate protection.
The debate also extends to the role of energy efficiency measures, such as improved building insulation, in offsetting the renewable energy requirement. Some propose lowering the mandated renewable energy share if significant efficiency gains are achieved. Discussions are ongoing regarding the timelines for implementing the changes, particularly for existing buildings.
Biomethane’s Role and Investment Uncertainty
The delay in finalizing the GMG is also impacting the biomethane sector. The future market for biomethane is heavily dependent on the rules established by the new legislation, as it is seen as a key renewable energy carrier capable of contributing to the 65% renewable energy target for gas-based heating systems. An analysis by the German Energy Agency (dena) suggests that the current GEG could increase biomethane demand to between 13.4 and 44.6 terawatt-hours (TWh) by 2040, assuming hydrogen does not grow widely available. However, the uncertainty surrounding the GMG is creating a bottleneck in investment for biomethane producers, hindering the development of production capacity, certification systems, and long-term supply contracts.
Government Response and Next Steps
A spokesperson for the Federal Ministry for Economic Affairs and Climate Action (BMWE) stated on February 2nd that the government is still in negotiations with the Ministry of Construction and the parliamentary groups, but remains optimistic about presenting draft proposals “soon.” The government aims to avoid a repeat of past legislative struggles, where ministries presented draft legislation without sufficient consultation with parliamentary factions. The Bundesregierung website details the ongoing efforts to transition to climate-friendly heating systems.
Heating System Sales Plummet
The impact of the legislative uncertainty is starkly visible in the heating system market. Sales figures reveal a significant downturn, with a 50% decrease in 2024 compared to the previous year, followed by a further 19% decline through August 2025. This trend underscores the urgent need for clarity and stable policy frameworks to encourage investment and consumer action.
Despite the current challenges, 79% of Germany’s 20 million residential buildings still rely on oil or gas heating, according to a January report from dena. This highlights the significant potential for modernization and the importance of comprehensive renovation measures, beyond simply replacing heating systems.
The coming weeks will be crucial as the governing coalition attempts to finalize the details of the GMG. The outcome will not only shape the future of Germany’s building sector but also influence the country’s ability to meet its ambitious climate targets. The next key checkpoint is the expected release of draft proposals from the government, which will then be subject to debate and negotiation within the Bundestag.
This ongoing debate over building energy standards underscores the complexities of transitioning to a sustainable energy future. Clear, consistent, and constitutionally sound policies are essential to fostering investment, encouraging innovation, and ensuring a just and effective energy transition for all.
Share your thoughts on the future of Germany’s building energy policy in the comments below.
