Die energetische Sanierung des Gebäudebestandes in Deutschland gehört zu den Schlüsselfaktoren für eine Verbesserung des Klimaschutzes. Trotz günstiger Rahmenbedingungen und ökonomischer Anreize hinkt die Umsetzung der energetischen Sanierung im Gebäudebestand jedoch bisher den vorhandenen technischen Möglichkeiten und den wirtschaftlich tragfähigen Maßnahmen deutlich hinterher. Die Ursachen hierfür sind sowohl vielfältig als auch auf verschiedenen Ebenen angesiedelt. Die Investitionsbereitschaft bei Haus- und Wohnungseigentümern scheint eher gering, auch aufgrund weiterhin bestehender Informationsdefizite beispielsweise in Hinsicht auf die Nachhaltigkeit energetischer Maßnahmen und das Ausmaß der Fördermöglichkeiten. Dies gilt auch bei verschiedenen Berufsgruppen, die für eine effektive und schnelle Umsetzung der energetischen Sanierung wichtig sind. Hinzu kommen eine hohe Zersplitterung der Beratungsangebote und eine damit verbundene Intransparenz der Beratungs- und Förderstruktur. Die Wüstenrot Stiftung hat sich angesichts der Unübersichtlichkeit entschieden, die Struktur und die Qualität der Energieberatung in Deutschland einer differenzierten Betrachtung zu unterziehen. Vorgenommen wurde eine Analyse der Rahmenbedingungen der Energieberatung in Deutschland, wozu auch eine Aufarbeitung des Beratungsbedarfes und eine Sichtung und Analyse der Informationswege zwischen Zielgruppen und Beratungsanbietern gehörte. Außerdem umfasste die Studie eine empirische Untersuchung zur Erhebung der Struktur der Energieberatungsangebote sowie die Erstellung einer Übersicht vor allem zu den Aktivitäten, die von Kommunen und Verbänden unternommen werden, um die verschiedenen Beratungsangebote zu koordinieren oder um in eigener Regie die Beratungsqualität vor Ort zu sichern. Mit der Durchführung der Untersuchung hat die Wüstenrot Stiftung das Wuppertal Institut für Klima, Umwelt, Energie GmbH beauftragt. Die gefundenen Ergebnisse belegen die Einschätzung zur zentralen Bedeutung einer umfassenden, von allen Betroffenen akzeptierten Energieberatung, ebenso wie das weiterhin vorhandene, nicht geringe Optimierungspotenzial auf diesem Sektor. In verschiedener Hinsicht spielen die Beratungsangebote der Kommunen eine wichtige Rolle in den Szenarien, die der weiteren Entwicklung der Energieberatung in Deutschland und der dadurch erzielbaren Effekte zugrunde gelegt werden können.
Many European city governments have voluntarily committed to ambitious CO2-emission reduction targets until 2020 and 2050. Supported by dedicated structures and networks (e.g. Covenant of Mayors), local governments have already developed, or are currently developing, ambitious climate action plans, all pursuing the aim of radical CO2-emission reduction in the long term.
Though, the development of climate action plans is only a first step, as the actual crucial and more challenging part its implementation. Besides financial investments also additional capacities, improved institutional structures and innovative strategies are necessary to successfully implement ambitious policies within existing national and regional framework conditions. There is often more competition than co-operation between cities. However, exchanging on common challenges in order to find new solutions provides potential for innovative ideas and new views on own structures. In particular, methods and formats for self-assessment and mutual learning can support cities' stakeholders to overcome their implementation gap in local energy and climate policies.
This paper will present results from the first phase of the three year project "CASCADE", which was initiated by 19 European cities in co-operation with EUROCITIES. Within the project, implementation challenges are being addressed in an intensive process of self-assessment and mutual learning. The methodological "backbone" of this process is a qualitative benchmarking framework in the thematic fields of "Renewable energy sources and distributed energy generation", "Energy efficient buildings and districts" and “Energy in urban transport”. Up to a certain degree, existing local climate policy benchmarks provide a common exchange platform, but mainly for the comparison between cities. The CASCADE benchmarking framework goes beyond competitive comparisons. As a qualitative criteria-based assessment procedure it identifies key challenges and factors for a successful implementation of established local climate policy plans. These factors have been developed from a qualitative survey including interviews and workshops with representatives of the participating cities.
Six cities serve as examples. Self-assessment reports were provided based on the CASCADE benchmarking framework focussing on the implementation status of their local climate policies. These reports were reevaluated by four or five project partners from different cities in a desk-review process. During subsequent four-days peer learning visits, the CASCADE benchmarking framework was used again as a tool for an in-depth assessment of the local climate and energy action plans and the local activities towards implementation of these strategic documents. Finally, the visitors drafted a feedback report with recommendations and improvements for the hosts.
The paper describes the methodology of the CASCADE benchmarking framework for integrated learning, its applicability for peer learning processes, as well as first experiences and results from the peer learning visits.
Mixed-method research to foster energy efficiency investments by small private landlords in Germany
(2020)
The decarbonisation of the building stock is an important element for the success of the German Energiewende (energy transition). Despite some progress having been made, the rate of energy renovation falls below the level required to meet political commitments. This gives rise to the question: what deters property owners from making energy efficiency investments and how can the policy framework foster such investments? To answer this question, the paper focuses on a widely neglected property owner group: small private landlords (SPL). Although they manage 37% of all residential rental properties in Germany, very little is known about their decision-making processes for energy efficiency investments. We applied a mixed-method design to identify factors that hindered and supported their investments. In an explorative study, we initially conducted 18 problem-centred interviews. Subsequently, we carried out a postal survey and analysed the questionnaires using a hierarchical linear regression model. The results show that energy renovation is a multi-dimensional decision-making process, which can only be adequately addressed by a comprehensive policy package. To develop such a package, the author recommends that the specific investment behaviour of SPL must be better targeted, their knowledge about energy efficiency investments must be improved through exchange and networking, a sense of responsibility for the neighbourhood must be fostered, and greater focus must be placed on improving local framework conditions
The German contribution to limiting global warming to two degrees has to be - as in other developed countries, too - a reduction of 80 to 95 percent of CO2 emissions by 2050 compared to 1990. The project "Low Carbon City Wuppertal 2050" has analysed how such a drastic reduction of CO2 could be achieved on a municipal level in the transportation and residential sector by also working on the land use and material flows dimension. The focus of this paper lies on the space heating in the residential sector.
Wuppertal is a city with about 350,000 inhabitants in the West of Germany. According to the CO2 balance (2007) of the city that was adjusted to the year 2010, the emissions that were caused by space heating in the residential sector remained almost the same since 1990. They decreased slightly from 693,000 tons CO2 in 1990 to 691,000 tons in 2010, although final energy use for space heating increased by about 15 percent. But the shift of energy sources especially from coal to gas avoided an increase of emissions. However, the reduction target of 95 percent means that CO2 emissions have to be reduced to 35,000 tons per year until 2050.
A reference scenario shows that the city could achieve about 30 percent of the reduction required with the current trend of renewable energy development and energy efficiency measures such as retrofitting the building stock. But looking at the difficult financial conditions of the municipality as well as at the socio-economic situation of the inhabitants it becomes clear that the remaining 65 percent of the target to a 95 percent reduction will be difficult to reach and that innovative measures of energy efficiency and sufficiency1 need to be developed.
But which social-ecological effects does the implementation of comprehensive climate protection measures have on the inhabitants of a city? How do people live in a "Low Carbon City"? In this paper qualitative and quantitative scenarios will be developed since the combination of both is promising to show both effects: what share could renewable energies, energy efficiency and sufficiency measures have in reaching the target of 95 percent, and how could life look like in an almost CO2 free city in Germany in 2050.
Städte haben in dreierlei Hinsicht eine Verbindung zum Klimawandel. Als Verursacher sind sie für einen wesentlichen Anteil der anthropogen verursachten Treibhausgasemissionen verantwortlich. Gleichzeitig sind sie von den Folgen des Klimawandels, z. B. durch zunehmende Hitzebelastung, Starkregenereignisse und Überschwemmungen, besonders betroffen. Schließlich können Städte als Experimentierfeld für die Entwicklung und Umsetzung von Klimaschutzkonzepten, Technologien und Maßnahmen dienen. Sie sind damit Initiator für einen Transformationsprozess hin zu einer nachhaltigen und zukunftsfähigen Entwicklung.