OPUS 4 | Zukünftige Energie- und Mobilitätsstrukturen

Re-energizing energy supply : electrolytically-produced hydrogen as a flexible energy storage medium and fuel for road transport (2017)

Bernd Emonts Sebastian Schiebahn Klaus Görner Dietmar Lindenberger Peter Markewitz Frank Merten Detlef Stolten

"Energiewende", which roughly translates as the transformation of the German energy sector in accordance with the imperatives of climate change, may soon become a byword for the corresponding processes most other developed countries are at various stages of undergoing. Germany's notable progress in this area offers valuable insights that other states can draw on in implementing their own transitions. The German state of North Rhine-Westphalia (NRW) is making its own contribution to achieving the Energiewende's ambitious objectives: in addition to funding an array of "clean and green" projects, the Virtual Institute Power to Gas and Heat was established as a consortium of seven scientific and technical organizations whose aim is to inscribe a future, renewable-based German energy system with adequate flexibility. Thus, it is tasked with conceiving of and evaluating suitable energy path options. This paper outlines one of the most promising of these pathways, which is predicated on the use of electrolytically-produced hydrogen as an energy storage medium, as well as the replacement of hydrocarbon-based fuel for most road vehicles. We describe and evaluate this path and place it in a systemic context, outlining a case study from which other countries and federated jurisdictions therein may draw inspiration.

The potential for energy efficiency in the EU member states : a comparison of studies (2017)

Katharina Knoop Stefan Lechtenböhmer

In October 2014, the European Council agreed on a target of improving overall energy efficiency by at least 27 per cent by 2030. According to the European Council's conclusions, this target should not be translated into nationally binding targets. Nevertheless individual Member States are free to set higher national objectives if desired. However, it is difficult to assess the degree of ambition of a national target because so far not much light has been shed upon the exact size of the untapped efficiency potentials. This paper provides an in-depth analysis and comparison of existing studies on energy efficiency potentials in the European Union's (EU) Member States by 2030. It includes a structured overview of the results, information on the quality of the available data and suggestions for improvement. The review shows that comprehensive studies on national energy efficiency potentials are rare and hardly comparable. The existing studies agree on the existence of significant potentials for energy efficiency. Their outcomes, however, vary significantly in terms of national levels. Assuming low policy intensity, energy savings between 10 and 28 per cent could be realised by 2030 compared to a baseline development, in the case of high policy intensity 7-44 per cent. Technical energy efficiency potentials in the different EU Member States are estimated at 14-52 per cent. On average, energy savings of 27 per cent by 2030 appear to be feasible with significant policy effort. We conclude that the deviation in Member States' energy efficiency potentials resulting from different studies represents an indication of the so far poor quality of underlying data. In order to allow for a concretisation of efficiency potential estimates, the comparability and detail of information sources should be improved.

Exploring the macro-scale CO2 mitigation potential of photovoltaics and wind energy in Europe's energy transition (2017)

Arkaitz Usubiaga José Acosta-Fernandez Will McDowall Francis G.N. Li

Replacing traditional technologies by renewables can lead to an increase of emissions during early diffusion stages if the emissions avoided during the use phase are exceeded by those associated with the deployment of new units. Based on historical developments and on counterfactual scenarios in which we assume that selected renewable technologies did not diffuse, we conclude that onshore and offshore wind energy have had a positive contribution to climate change mitigation since the beginning of their diffusion in EU27. In contrast, photovoltaic panels did not pay off from an environmental standpoint until very recently, since the benefits expected at the individual plant level were offset until 2013 by the CO2 emissions related to the construction and deployment of the next generation of panels. Considering the varied energy mixes and penetration rates of renewable energies in different areas, several countries can experience similar time gaps between the installation of the first renewable power plants and the moment in which the emissions from their infrastructure are offset. The analysis demonstrates that the time-profile of renewable energy emissions can be relevant for target-setting and detailed policy design, particularly when renewable energy strategies are pursued in concert with carbon pricing through cap-and-trade systems.

Recht versus System : Pkw-Abgasaffäre (2017)

Hans-Jochen Luhmann

Politische Stachel der Suffizienz (2017)

Uta von Winterfeld

Realising long-term transitions towards low carbon societies : impulses from the 8th annual meeting of the International Research Network for Low Carbon Societies (2017)

In spite of current multiple political crises, global warming will remain a prime issue on the global agenda. The adoption of the Paris Agreement in 2015 and its quick ratification in 2016 have created a strong momentum for worldwide action against climate change. As global greenhouse gas emissions must decline towards levels close to zero by the middle of the century, the rapid decarbonisation of energy systems is high on the agenda of most countries around the globe. This publication delivers insights into cutting edge research on the necessary transitions towards low carbon societies and by this aims to contribute to international as well as national policymaking. The topics covered in more than 20 concise original articles are among the most important issues for progressing solutions for climate change and sustainable development. The papers discuss recent findings and case studies in the following subject areas: Governance of the necessary long-term transitions in the context of potential known and unknown adverse developments; Policy instruments and strategies that allow for financing the transition to low carbon economies and, at the same time, respond to today's economic and social challenges; Integrated strategies for three of the most important arenas of global decarbonisation: Cities, as much of the change and necessary investment for low carbon societies must take place, be planned, be financed and be built in cities; industry, particularly the energy-intensive processing industries, which are at the core of society's metabolism and are responsible for a large and growing share of global emissions and science as a whole, which must become more solutions-oriented because the transitions needed will rely heavily on research providing solutions for technological as well as societal problems. As a contribution to these great challenges and at the request of the G7 Environment Ministers, the Low Carbon Society Research Network (LCS-RNet) acts as a forum aimed at fostering research and policymaking to jointly achieve decarbonised energy systems in countries around the world. It convenes leading scientists, practitioners and policymakers and aims at supporting governments in proceeding jointly towards the design and implementation of climate-friendly low carbon societies.

Energie der Zukunft? : Nachhaltige Mobilität durch Brennstoffzelle und H2 ; Shell Wasserstoff-Studie (2017)

Jörg Adolf Christoph H. Balzer Jurgen Louis Uwe Schabla Manfred Fischedick Karin Arnold Andreas Pastowski Dietmar Schüwer

Wasserstoff ist ein Element, das viel Beachtung erhält: Es gilt als Basis einer nachhaltigen Energiezukunft. Allerdings ist Wasserstoff nicht allein, er konkurriert mit anderen Energien und ihren Nutzungstechnologien. Es stellt sich die Frage, ob Wasserstoff im globalen Energiesystem der Zukunft eine tragende Rolle spielen kann bzw. wird. Shell ist schon seit Jahrzehnten in der Wasserstoff-Forschung und -Entwicklung aktiv. In Zusammenarbeit mit dem Wuppertal Institut hat Shell jetzt eine Energieträger-Studie erstellt, die sich mit dem aktuellen Stand und den langfristigen Perspektiven der Wasserstoffnutzung, insbesondere für Energie- und Verkehrszwecke, befasst. Die Shell Wasserstoff-Studie diskutiert zunächst natürliche Vorkommen, Eigenschaften sowie historische Sichtweisen des Elements Wasserstoff. Anschließend werden aktuelle sowie künftige Verfahren und Ausgangsstoffe zur Erzeugung von Wasserstoff untersucht; dabei werden die Herstellungspfade in puncto Energieaufwand, Treibhausgasemissionen sowie Bereitstellungskosten miteinander verglichen. Weiterhin werden Fragen der Wasserstofflogistik untersucht. Dazu gehören zum einen heutige und künftige Speichermethoden, zum anderen die verschiedenen Transportoptionen und ihre jeweiligen Vorzüge einschließlich Fragen der Transportökonomie. Es folgt eine Darstellung der unterschiedlichen Nutzungsmöglichkeiten von Wasserstoff. Unterschieden wird zwischen stofflichen und energetischen Nutzungen. Die Analyse der energetischen Wasserstoffnutzung fokussiert auf die Brennstoffzelle - und nicht auf Wärmekraftprozesse. Auf der Anwenderseite werden energetische stationäre Anwendungen für die Back-up-Stromerzeugung sowie die Hausenergieversorgung - und diese einschließlich Wirtschaftlichkeit - untersucht. Den Schwerpunkt der Studie bilden (auto)mobile Wasserstoffanwendungen. Hierfür werden zunächst technologischer Stand und Perspektiven mobiler Anwendungen - von der Raumfahrt über Material Handling bis hin zum Pkw - erörtert. Anschließend wird die Wirtschaftlichkeit von wasserstoff-betriebenen Brennstoffzellen-Pkw (FCEV) mit Hilfe eines vereinfachten Autokosten-Vergleichs analysiert. Es schließt sich eine Diskussion des Aufbaus einer Wasserstoff-Tankstelleninfrastruktur für den Straßenverkehr an. Abschließend werden in Anlehnung an das ambitionierte 2DS-Wasserstoffszenario der Internationalen Energieagentur mögliche Auswirkungen von Brennstoffzellen-Pkw auf Kraftstoffverbrauch und Treibhausgasemissionen in ausgewählten Regionen bis 2050 diskutiert.

The social costs of electricity generation : categorising different types of costs and evaluating their respective relevance (2017)

Sascha Samadi

Various electricity generation technologies using different primary energy sources are available. Many published studies compare the costs of these technologies. However, most of those studies only consider plant-level costs and do not fully take into account additional costs that societies may face in using these technologies. This article reviews the literature on the costs of electricity generation technologies, aiming to determine which types of costs are relevant from a societal point of view when comparing generation technologies. The paper categorises the relevant types of costs, differentiating between plant-level, system and external costs as the main categories. It discusses the relevance of each type of cost for each generation technology. The findings suggest that several low-carbon electricity generation technologies exhibit lower social costs per kWh than the currently dominant technologies using fossil fuels. More generally, the findings emphasise the importance of taking not only plant-level costs, but also system and external costs, into account when comparing electricity generation technologies from a societal point of view. The article intends to inform both policymakers and energy system modellers, the latter who may strive to include all relevant types of costs in their models.

Key issues for the implementation of the Paris Agreement and the long-term transformation towards low carbon societies : editorial (2017)

Stefan Lechtenböhmer Katharina Knoop

Small-scale energy projects in the global south (2017)

Marie-Christine Gröne Julia C. Terrapon-Pfaff Carmen Dienst Willington Ortiz

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