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Die Städte tragen weltweit am stärksten zum Klimawandel bei. Wer mit dem Klimaschutz ernst machen will, muss also dort ansetzen. Eine Metropole in einen weitgehend CO2-freien Ballungsraum umzuwandeln, ist eine sehr anspruchsvolle, aber machbare Aufgabe, die natürlich nicht umsonst zu haben ist, sich im Großen und Ganzen aber rechnet. Wie eine aktuelle Studie zeigt, lässt sich die weitgehende CO2-Freiheit aber nur realisieren, wenn der gesamte Entwicklungsprozess der urbanen Infrastrukturen in die Stadt-, Gebäude-, Verkehrs- und Energieplanung sowie in die Investitionsentscheidungen der privaten Akteure vorrangig integriert wird. Und wenn alle mitziehen: Verwaltungen, Stadtplaner, Energieversorger und der Bürger.
Preventing the worst consequences of climate change would require that GHG emissions be reduced to levels near zero by the middle of the century. To respond to such a daunting challenge, we need to rethink and redesign the currently highly energy-dependent infrastructures of industrial societies and particularly the urban infrastructures to become low- or even zero-carbon cities. Sustainable urban infrastructures need technology. In this paper focused on Western European Cities, we discuss a wide set of technologies in the fields of building, energy and transport infrastructures that can significantly contribute to a reduction of energy and/or GHG emissions and are already available or are in the pipeline. Based on the review of a recent study for the city of Munich, we then present how a mix of these technologies could reduce CO2-emissions by up to 90% for the metropolis of 1.3 million inhabitants and that this strategy could be economically attractive despite a high initial investment.
All of the residential buildings of a city like Munich could be entirely redesigned for EUR 200 per inhabitant annually, which is about one third of an average annual natural gas bill.
International consensus is growing that a transition towards a low carbon society (LCS) is needed over the next 40 years. The G8, the Major Economies Forum on Energy and Climate, as well as the Ad Hoc Working Group on Long-term Cooperative Action under the United Nations Framework Convention on Climate Change, have concluded that states should prepare their own Low-emission Plans or Low-emission Development Plans and such plans are in development in an increasing number of countries.
An analysis of recent long-term low emission scenarios for Germany shows that all scenarios rely heavily on a massive scale up of energy efficiency improvements based on past trends. However, in spite of the high potential that scenario developers assign to this strategy, huge uncertainty still exists in respect of where the efficiency potentials really lie, how and if they can be achieved and how much their successful implementation depends on more fundamental changes towards a more sustainable society (e.g. behavioural changes).
In order to come to a better understanding of this issue we specifically examine the potential for energy efficiency in relation to particular demand sectors. Our comparative analysis shows that despite general agreement about the high importance of energy efficiency (EE), the perception on where and how to achieve it differ between the analysed scenarios. It also shows that the close nexus between energy efficiency and non-technical behavioural aspects is still little understood. This leads us to the conclusion that in order to support energy policy decisions more research should be done on energy efficiency potential. A better understanding of its potential would help energy efficiency to fulfil its role in the transition towards a LCS.
Der hier vorliegende Report ist das Ergebnis des Teilprojekts "Transformation und Vernetzung städtischer Energieinfrastrukturen", welches Teil des "Rahmenprogramms zur Umsetzung der Energiewende in den Kommunen des Ruhrgebiets - Energiewende Ruhr" ist.
Die Transformation der Energieinfrastruktur, in einer Region die noch immer überwiegend auf zentrale Erzeugung und entsprechende Versorgungssysteme ausgerichtet sind, zählt zu den großen Herausforderungen einer gelungenen Energiewende - auch wenn nur ein Teil dieser Herausforderungen in der Region selbst beeinflusst werden kann.
Im Rahmen des Teilprojekts wurden zentrale technologisch-infrastrukturelle Herausforderungen im Kontext der Umsetzung der Energiewende im kommunalen Bereich analysiert. Insbesondere war hierbei von Interesse, wie das gezielte Vernetzen unterschiedlicher Infrastrukturbereiche (Strom, Wärme, Verkehr) einen Beitrag dazu leisten kann, Effizienzpotenziale zu heben und damit ein nachhaltiges und zukunftsfähiges Infrastruktursystem zu schaffen. Inhaltlich fokussierten die Analysen auf die Bereiche Kraft-Wärme-Kopplung (KWK) und Wasserstoff.
Bislang wurden solche mittel- und langfristigen Transformationsprozesse häufig allein durch technologiebezogene Szenarien und Strategien beschrieben. Der Ansatz erweist sich zunehmend als nicht zielführend, da er sich zu sehr auf einzelne Technologiebereiche beschränkt und das systemische Zusammenspiel zu wenig beleuchtet. Zudem werden weitere Faktoren (Nutzerverhalten, Investitionsentscheidungen, finanzielle Handlungsspielräume auf der Verbraucherseite, Akteursnetzwerke etc.) zumeist nur marginal betrachtet. Im Rahmen des Projekts wurde daher der methodische Zugang einer Cross-Impact-Bilanz gewählt, um diskursiv und partizipatorisch qualitative Zukunftsbilder für die Technologiebereiche zu entwerfen.
The Low Carbon Future Cities (LCFC) project aims at facing a three dimensional challenge by developing an integrated city roadmap balancing: low carbon development, gains in resource efficiency and adaptation to climate change. The paper gives an overview of the first outcomes of the analysis of the status quo and assessment of the most likely developments regarding GHG emissions, climate impacts and resource use in Wuxi - the Chinese pilot city for the LCFC project. As a first step, a detailed emission inventory following the IPCC guidelines for Wuxi has been carried out. In a second step, the future development of energy demand and related CO2 emissions in 2050 were simulated in a current policy scenario (CPS). In parallel, selected aspects of material and water flows for the energy and the building sector were analyzed and modeled. In addition, recent and future climate impacts and vulnerability were investigated. Based on these findings, nine key sectors with high relevance to the three dimensions could be identified. Although Wuxi's government has started a path to implement a low carbon plan, the first results show that, for the shift towards a sustainable low carbon development, more ambitious steps need to be taken in order to overcome the challenges faced.
Urbanization and climate change are amongst the greatest challenges of the 21st century. In the "Low Carbon Future Cities" project (LCFC), three important problem dimensions are analysed: current and future GHG emissions and their mitigation (up to 2050); resource use and material flows; and vulnerability to climate change.
The industrial city of Wuxi has been the Chinese pilot city of the project. To establish the pathway for a low carbon future, it is crucial to understand the current situation and possible future developments. The paper presents the key results of the status quo analysis and the future scenario analysis carried out for Wuxi. Two scenarios are outlined. The Current Policy Scenario (CPS) shows the current most likely development in the area of energy demand and GHG emissions until 2050. Whereas the extra low carbon scenario (ELCS) assumes a significantly more ambitious implementation, it combines a market introduction of best available technologies with substantial behavioural change. All scenarios are composed of sub-scenarios for the selected key sectors.
Looking at the per capita emissions in Wuxi, the current levels are already high at around 12 tonnes CO2 per capita compared to Western European cities. Although Wuxi has developed a low carbon plan, the projected results under current policies (CPS) show that the total emissions would increase to 23.6 tonnes CO2 per capita by 2050. If the ELCS pathway was to be adopted, these CO2 emission levels could be reduced to 6.4 tonnes per capita by 2050.
In der vorliegenden Szenariostudie zeigen Forscher des Wuppertal Instituts, wie sich die Treibhausgasemissionen des Verkehrs in Deutschland von 166 Millionen Tonnen im Jahr 2016 bis zum Jahr 2035 auf null senken lassen - eine Zielmarke, die unter der Prämisse notwendig ist, dass die Erderwärmung auf möglichst 1,5 Grad Celsius begrenzt werden soll. Die Umsetzung dieser von der Staatengemeinschaft auf dem Klimaschutzgipfel in Paris 2015 vorgegebene Zielmarke erfordert eine rasche und konsequente Reduktion der Treibhausgasemissionen in allen Sektoren und auf nationaler wie globaler Ebene.
Zielsetzung des Forschungsprojektes war es, Klimaschutzszenarien für Deutschland zu entwickeln, die hinsichtlich ihres klimapolitischen Ziels, d.h. ihres langfristigen Emissionsminderungsbeitrags, im Wesentlichen gleich sind, die aber zum Teil auf unterschiedliche Optionen zur Reduktion der energiebedingten CO2-Emissionen setzen. Diese Klimaschutzszenarien wurden hinsichtlich sozioökonomischer und ökologischer Kriterien evaluiert und miteinander verglichen.
The Port of Rotterdam is an important industrial cluster mainly comprising of oil refining, chemical manufacturing and power and steam generation. In 2015, the area accounted for 18 % of the Netherlands' total CO2 emissions. The Port of Rotterdam Authority is aware that the port's economy is heavily exposed to future global and EU decarbonization policies, as the bulk of its activities focuses on trading, handling, converting and using fossil fuels. Based on a study for the Port Authority, our paper explores possible pathways of how the industrial cluster can keep its strong market position in Europe and still reduce its CO2 emissions by 98 % by 2050. The "Biomass and CCS" scenario assumes that large amounts of biomass can be supplied sustainably and will be used in the port for power generation as well as for feedstock for refineries and the chemical industry. Fischer-Tropsch fuel generation plays an important role in this scenario, allowing the port to become a key cluster for the production of synthetic fuels and feedstocks in Western Europe. The "Closed Carbon Cycle" scenario assumes that renewables-based electricity will be used at the port to supply heat and hydrogen for the synthetic generation of feedstock for the chemical industry. The carbon required for the chemicals will stem from recycled waste. Technologies particularly needed in this scenario are water electrolysis and gasification or pyrolysis to capture carbon from waste, as well as technologies for the production of base chemicals from syngas. The paper compares both scenarios with regard to their respective technological choices and infrastructural changes. The scenarios’ particular opportunities and challenges are also discussed. Using possible future pathways of a major European petrochemical cluster as an example, the paper illustrates options for deep decarbonisation of energy intensive industries in the EU and beyond.
Converting electricity into heat offers the opportunity to make of use large scales of renewable (surplus) energy in the long run in order to reduce shut-downs of renewable power plants and to substitute fossil fuels. Electrification seems to be also very promising for industrial heat applications, as it enables high process temperatures to be achieved in a tailor-made and efficient way and enables the utilisation of other energy sources like waste heat, geothermal or ambient heat (via heat pumps). This article analyses theoretical and technical electrification potentials of Steam Generation and Other Process Heat Generation in the following energy-intensive branches: iron & steel, non-ferrous metal, iron foundries, refineries, base chemicals, glass, cement clinker and paper industry in Germany. Literature research, expert interviews as well as own modelling were conducted to determine potentials and their implementation barriers. Based on these methods, market potential to electrify industrial steam generation was estimated. On the basis of two climate protection scenarios, the effects of both a monovalent and a hybrid industrial power-to-heat strategy were quantified with regard to greenhouse gas reduction and energy efficiency (primary energy saving). The pathway towards electrification will be reflected by criteria such as path dependency, dependency of infrastructure and system compatibility. Recommendations for research and development as well as policies are derived from the overall analysis. The article shows that electrification can be an important option to achieving high CO2-savings in the industrial heating sector in a long-term perspective. However, the scenario calculations show that electrification does not in itself guarantee reduction of greenhouse gases or savings of primary energy. To reach these goals, it is essential to further develop industrial heat pumps and to map electrification and further development of renewable energy (including infrastructure such as power networks and storage facilities) in a concerted strategy.
The German federal state of North Rhine-Westphalia (NRW) is home to important clusters of energy-intensive basic materials industries. 15% of the EU's primary steel as well as 15% of high-value base chemicals are produced here. Together with refinery fuels, cement, lime and paper production (also overrepresented in NRW) these are the most carbon-intensive production processes of the industrial metabolism. To achieve the ambitious regional and national climate goals without relocating these clusters, carbon-neutral production will have to become standard by mid-century. We develop and evaluate three conceptual long-term scenarios towards carbon-neutral industry systems for NRW for 2050 and beyond:
* a first scenario depending on carbon capture and storage or use for heavy industries (iCCS),
* a second scenario sketching the direct electrification of industrial processes (and transport) and
* a third scenario relying on the import of low carbon energies (e.g. biomass, and synthetic fuels (like methanol) for the use in industries and transport. All scenarios share the assumption that electricity generation will be CO2-neutral by 2050.
For all three scenarios energy efficiency, primary energy demand for energy services and feedstock as well as the carbon balance are quantified. We apply a spatial-explicit analysis of production sites to allow for discussion of infrastructure re-use and net investment needs. Possible symbiotic relations between sectors are also included. The robustness of the three conceptualised future carbon-neutral industry systems is then analysed using a multi-criteria approach, including e.g. energy security issues and lock-ins on the way to 2050.
On behalf of the Port of Rotterdam Authority, the Wuppertal Institute developed three possible pathways for a decarbonised port of Rotterdam until 2050. The port area is home to about 80 per cent of the Netherlands' petrochemical industry and significant power plant capacities. Consequently, the port of Rotterdam has the potential of being an international leader for the global energy transition, playing an important role when it comes to reducing CO2 emissions in order to deliver on the EU's long-term climate goals.
The three decarbonisation scenarios all built on the increasing use of renewables (wind and solar power) and the adoption of the best available technologies (efficiency). The analysis focuses on power plants, refineries and the chemical industry, which together are responsible for more than 90 per cent of the port area's current CO2 emissions.
The decarbonisation scenarios describe how CO2 emissions could be reduced by 75 to 98 per cent in 2050 (compared to 2015). Depending on the scenario, different mitigation strategies are relied upon, including electrification, closure of carbon cycles or carbon capture and storage (CCS). The study includes recommendations for local companies, the Port Authority as well as policy makers. In addition, the study includes a reference scenario, which makes it clear that a "business as usual" mentality will fall well short of contributing adequately to the EU's long-term climate goals.
Following the decisions of the Paris climate conference at the end of 2015 as well as similar announcements e.g. from the G7 in Elmau (Germany) in the summer of 2015, long-term strategies aiming at (almost) full decarbonisation of the energy systems increasingly move into the focus of climate and energy policy. Deep decarbonisation obviously requires a complete switch of energy supply towards zero GHG emission sources, such as renewable energy. A large number of both global as well as national climate change mitigation scenarios emphasize that energy efficiency will likewise play a key role in achieving deep decarbonization. However, the interdependencies between a transformation of energy supply on the one hand and the role of and prospects for energy efficiency on the other hand are rarely explored in detail.
This article explores these interdependencies based on a scenario for Germany that describes a future energy system relying entirely on renewable energy sources. Our analysis emphasizes that generally, considerable energy efficiency improvements on the demand side are required in order to have a realistic chance of transforming the German energy system towards 100 % renewables. Efficiency improvements are especially important if energy demand sectors will continue to require large amounts of liquid and gaseous fuels, as the production of these fuels are associated with considerable energy losses in a 100 % renewables future. Energy efficiency on the supply side will therefore differ considerably depending on how strongly the use of liquid and gaseous fuels in the various demand sectors can be substituted through the direct use of electricity. Apart from a general discussion of the role of energy efficiency in a 100 % renewable future, we also look at the role of and prospects for energy efficiency in each individual demand sector.
Um weltweit hochindustrialisierte, energieintensive Bundesländer und Regionen bei der Entwicklung und Umsetzung von innovativer Klimapolitik zu unterstützen, wurde die "Energy Transition Platform" ins Leben gerufen. Ziel ist der Austausch von Erfahrungen sowie eine Einflussnahme auf den internationalen Klimadialog. Für diesen Austausch- und Dialogprozess erarbeitete das Wuppertal Institut für die "Climate Group" die Fallstudie "Eine Industrieregion im Wandel - Energie- und klimapolitische Rahmenbedingungen, Strategien und Instrumente in NRW". In dem Bericht werden aktuelle energie- und klimapolitische Entwicklungen, Politikinstrumente und Modellprojekte dargestellt und diskutiert.
Die Fallstudie macht deutlich, dass Nordrhein-Westfalen bei der Umsetzung der Energiewende zwar vor besonderen Herausforderungen steht, die Modernisierung des Energiesystems und des Industriestandortes NRW jedoch mit Hilfe eines vielfältigen Instrumentariums systematisch und intensiv angeht. Eine solche proaktive und langfristig ausgelegte Herangehensweise ist zentrale Voraussetzung dafür, dass die bevorstehende Transformation letztlich nicht zu einem kaum steuerbaren Strukturbruch in NRW und seinen Regionen und Kommunen führt, sondern zu einem schrittweisen Strukturwandel, der von Politik, Wirtschaft und Gesellschaft gemeinsam gestaltet wird.
Im Rahmen der Energiewende haben sich erneuerbare Energien zur Stromerzeugung in Deutschland bereits etabliert. Um jedoch das volle Potenzial der Reduktion von fossilen Energien und Treibhausgasen (THG) auszuschöpfen, muss aus der Energiewende auch eine Wärmewende werden. Der Energieeinsatz für die Wärmebereitstellung der Industrie betrug im Jahr 2012 etwa 535 TWh (22 % des Endenergiebedarfs Deutschlands), hauptsächlich bereitgestellt durch Erdgas (48 %) und Steinkohle (17 %) 1. Damit wurden für die Wärmebereitstellung im Industriesektor rund 159 Mio. t CO2-äq emittiert, was 17 % der THG-Emissionen Deutschlands entspricht.
Aufgrund der Vielseitigkeit der einzelnen Branchen und Wärmeanwendungen im Industriesektor kann dieser Beitrag nur beispielhaft einzelne Komponenten für eine Wärmewende aufzeigen, die auch wiederum die Aktivitäten der einzelnen Autoren widerspiegeln. Ausgehend von einer nationalen Betrachtung und expliziten Modellierungsergebnissen für die energieintensive Industrie in NRW, werden einzelne Potenziale und Aktivitäten im Bereich der Wärmebereitstellung, -speicherung und -integration behandelt.