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As a key element of its strategy to increase energy efficiency and renewable energies in buildings, Germany has recently revised its building energy act. The revision of the law has received unprecedented media attention and has dominated the energy policy discourse in 2023 in Germany and beyond. Driven by the German tabloid “BILD”, a campaign making use of populist discourses and misinformation has filled the front pages of German newspapers. The high media reception of the so-called “heating hammer” has strongly impacted not only the provisions of the law itself but has also caused considerable damage to future energy efficiency policy developments, leading to a withdrawal of a previously announced tightening of energy efficiency standards as well as the watering down of Germany´s position in the trilogue negotiations on the Energy Performance of Buildings Directive. Given the relevance of the process and the discourse for current and future policy developments, our paper provides an analysis of the differ
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Model-based scenario analyses of future energy systems often come to deviating results and conclusions when different models are used. This may be caused by heterogeneous input data and by inherent differences in model formulations. The representation of technologies for the conversion, storage, use, and transport of energy is usually stylized in comprehensive system models in order to limit the size of the mathematical problem, and may substantially differ between models. This paper presents a systematic comparison of nine power sector models with sector coupling. We analyze the impact of differences in the representation of technologies, optimization approaches, and further model features on model outcomes. The comparison uses fully harmonized input data and highly simplified system configurations to isolate and quantify model-specific effects. We identify structural differences in terms of the optimization approach between the models. Furthermore, we find substantial differences in technology modeling primarily for battery electric vehicles, reservoir hydro power, power transmission, and demand response. These depend largely on the specific focus of the models. In model analyses where these technologies are a relevant factor, it is therefore important to be aware of potential effects of the chosen modeling approach. For the detailed analysis of the effect of individual differences in technology modeling and model features, the chosen approach of highly simplified test cases is suitable, as it allows to isolate the effects of model-specific differences on results. However, it strongly limits the model’s degrees of freedom, which reduces its suitability for the evaluation of fundamentally different modeling approaches.
models based on simplified test cases 30.04.2022 Energie & Klimaschutz Bücher

Model-based scenario analyses of future energy systems often come to deviating results and conclusions when different models are used. This may be caused by heterogeneous input data and by inherent differences in model formulations. The representation of technologies for the conversion, storage, use, and transport of energy is usually stylized in comprehensive system models in order to limit the size of the mathematical problem, and may substantially differ between models. This paper presents a systematic comparison of nine power sector models with sector coupling. We analyze the impact of differences in the representation of technologies, optimization approaches, and further model features on model outcomes. The comparison uses fully harmonized input data and highly simplified system configurations to isolate and quantify model-specific effects. We identify structural differences in terms of the optimization approach between the models. Furthermore, we find substantial differences in technology modeling primarily for battery electric vehicles, reservoir hydro power, power transmission, and demand response. These depend largely on the specific focus of the models. In model analyses where these technologies are a relevant factor, it is therefore important to be aware of potential effects of the chosen modeling approach. For the detailed analysis of the effect of individual differences in technology modeling and model features, the chosen approach of highly simplified test cases is suitable, as it allows to isolate the effects of model-specific differences on results. However, it strongly limits the model’s degrees of freedom, which reduces its suitability for the evaluation of fundamentally different modeling approaches.
models based on simplified test cases 30.04.2022 Energie & Klimaschutz Bücher

The energy crisis following the Russian invasion of Ukraine has prompted an acceleration of policy efforts to encourage energy savings. Numerous policy interventions were proposed and implemented as a reaction to the energy crisis in the countries affected by the interrupted supply of Russian gas. With public acceptance being a key success factor for the implementation of policies addressing energy savings, our paper analyses the discourse on energy conservation policies during the crisis in Germany, using X data (formerly Twitter). The analysis aims to quantify whether the energy crisis has polarized the discourse on energy efficiency policy. The results of the quantitative analysis are to be backed up by a qualitative manual analysis of a sample of tweets, which could also provide insights into the users‘ argumentation. By analysing a set of 136,837 Tweets related to energy and gas saving posted between January 2022 and May 2023, we show a heightened public focus on energy efficiency policy during the cris
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The energy crisis following the Russian invasion of Ukraine has prompted an acceleration of policy efforts to encourage energy savings. Numerous policy interventions were proposed and implemented as a reaction to the energy crisis in the countries affected by the interrupted supply of Russian gas. With public acceptance being a key success factor for the implementation of policies addressing energy savings, our paper analyses the discourse on energy conservation policies during the crisis in Germany, using X data (formerly Twitter). The analysis aims to quantify whether the energy crisis has polarized the discourse on energy efficiency policy. The results of the quantitative analysis are to be backed up by a qualitative manual analysis of a sample of tweets, which could also provide insights into the users‘ argumentation. By analysing a set of 136,837 Tweets related to energy and gas saving posted between January 2022 and May 2023, we show a heightened public focus on energy efficiency policy during the cris
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Analyse der dritten Bundeswaldinventur
So hat der Anteil an naturnahen Baumarten – besonders von Buche und Eiche – genauso

This article compares the drivers and barriers of two sustainability transformations in Germany: the energy transformation (“Energiewende”) andt he attempted transformation towards organic agriculture which has, so far, been less successful. It is based on two case studies rooted in transformation research. While there is rapidly growing literature on energy, there are far fewer analyses of agricultural transformations. Moreover, single case studies dominate. The cross-case comparison presented in this article is a step towards filling this gap. Particularly in their initial stages, the two transformation processes shared similarities: both systems had been coming under pressure due to environmental crises, grassroots movements and niche developments of sustainable alternatives. However, changes to the regulatory system framework made investments in renewable energy more attractive than in organic agriculture, where the profitability of the transformation is still reduced by significant subsidies for conventional agriculture. Moreover, the energy transformation has benefitted from technological improvements and falling costs, an early coalition of supporters, including business actors, and more recently from abroader societal and political consensus. ©2019 D. A. Heyen, F.Wolff; licensee oekom verlag. This Open Access article is published under the terms of the Creative Commons Attribution License CCBY4.0 (http://creativecommons.org/licenses/by/4.0). https://doi.org/10.14512/gaia.28.S1.9 Submitted December 19, 2018; revised version accepted July 12, 2019.
of sustainability transformations 22.08.2019 Umweltrecht & Governance Bücher

The 24th international climate conference in Katowice, Poland, in December 2018 was a major achievement in the multilateral response to climate change. More than 190 countries managed to agree on nearly all elements of a comprehensive rulebook that puts flesh on the bones of the 2015 Paris Agreement. The rules require, for the first time, that all countries provide detailed information on their climate change mitigation targets and regularly report on their progress in implementing and achieving them. However, one important chapter is still missing: rules for international carbon markets discussed under Article 6 of the Paris Agreement. Competing views on how to avoid “double counting”—counting the same emission reduction more than once to achieve climate mitigation targets—were a major roadblock to reaching consensus. Completing the missing chapter on Article 6 will be one of the key tasks when countries reconvene at the 25th international climate conference in Santiago, Chile, in December of this year. We highlight why resolving double counting is critical for achieving the goals of the Paris Agreement and identify essential ingredients for a robust outcome that ensures environmental effectiveness and facilitates cost-effective mitigation. Science  11 Oct 2019: Vol. 366, Issue 6462, pp. 180-183 DOI: 10.1126/science.aay8750 
counting and the Paris Agreement rulebook 11.10.2019 Energie & Klimaschutz Bücher

The EU ETS is one of the first emissions trading schemes in the world and has contributed to the reduction of greenhouse gas emissions in the sectors covered by the scheme in recent years. The EU has adopted the introduction of a new, separate emissions trading scheme (ETS 2) for the buildings and transport sectors as well additional sectors. In our paper we estimate the impact of the new ETS 2 on the buildings sector. We calculate the greenhouse gas emission reduction in the year 2030 using an approach based on price elasticities. We further discuss the impact of the ETS 2 on cost-effectiveness of heat pump deployment in the EU Member States to outline an example of longer-term effects on investments. The results show that with a carbon price of 45 Euro per ton the impact ranges between three and seven Million tons of greenhouse gas emission reductions. Even with optimistic assumptions on the reaction of building owners, the overall contribution of the ETS 2 to meeting the EU target for reducing greenhouse
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In the discussion on the potential risk of carbon leakage related to the EU ETS and the effect of safeguard measures, the scope for passing through carbon costs into final product prices is considered a key issue. This study investigates whether and to what extent ETS-related carbon costs have been passed through into product prices by EU industry. Literature on the issue of carbon cost pass-through in industry, other than electric power generation, is relatively sparse and we therefore aim to add to the knowledge gathered in this area so far. We investigate a number of products in six industry sectors in several European countries and regions and provide estimates for carbon cost pass-through for more than 50 product/country pairs. In line with the literature, our econometric results imply significant cost pass-through for a number of products, with results being most conclusive for the cement, iron and steel, and refineries sectors. The extent of the estimated pass-through rates diverges between products and countries/regions. These findings are aimed at informing discussions about carbon leakage protection for industries covered by the EU ETS.
sectors 16.09.2020 Energiewende und Klimapolitik Energie & Klimaschutz Bücher