Towards a European Energy Transition? A Review of Current Policy Challenges and Scientific Debates -- Part I. The European Climate and Energy Policy Framework -- EU Climate and Energy Policy beyond 2020: Are Additional Targets and Instruments for Renewables Economically Reasonable? -- EU Climate and Energy Policy beyond 2020: Is A Single Target for GHG Reduction Sufficient? -- Assessment of Policy Pathways for Reaching the EU Target of (at least) 27% RES by 2030 -- The Influence of European State Aid Law on the Design of Support Schemes for Electricity from Renewable Energy Sources in Germany and Other Member States -- A Step Further Towards a European Energy Transition: The "Clean Energy Package" from a Legal Point of View -- Part II. Unilateralism or Cooperation and Convergence? -- Electricity Market Integration and the Impact of Unilateral Policy Reform -- Creating Convergence of National Energy Policies by Increased Cooperation: EU Energy Governance and Its Impact on the German Energy Transition -- Policy Convergence as a Multi-faceted Concept: The Case of Renewable Energy Policies in the EU -- International Coordination on the Provision of Power Generation Capacity - An Institutional Economic Assessment of Decision-Making Competences in a Union of States -- From National to Cross-Border Support of Renewable Electricity in the European Union -- On the Alleged Need to Strictly Europeanize the German Energy Transition -- Germany: Forerunner in Europe with Respect to Energy System Transition? -- Part III. Is There a "Dark Side" to Germany's Energy Transition? -- The Myth of the Dark Side of the Energiewende -- Ensuring Industrial Competitiveness with a Unified European Approach to Sustainable Energy -- Rising Energy Prices due to Inefficient Support for Renewables? An Economic Assessment of status quo and Alternatives in Germany -- Import Dependency and the Energy Transition: a New Risk Field of Security of Supply? -- Combining Climate Protection and Nature Conservation - Requirements for An Environmental-Friendly Energy Transition -- The Relevance of Consumer Preferences and Behaviour for Climate Policy Design: Evidence from the German Energy Transition -- Part IV. The Energy Policy Mix from a Political Economy Perspective -- Cooperative Renewable Energy Expansion in Europe: Cost Savings and Trade Dependencies -- Energy Transition Implications for Demand and Supply of Power System Flexibility: A Case Study of the Netherlands Within an EU Electricity Market and Trading Context -- A Public Choice View on the Climate and Energy Policy Mix in the EU - How Do the Emissions Trading Scheme and Support for Renewable Energies Interact? -- Between Energy Transition and Internal Market Agenda: The Impact of the EU Commission as a Distinct Energy Policy Actor -- Part V. The Spatial Dimension of the Energy Transition -- Cross-Border Electricity Interconnectors in the EU: the status quo -- The Electricity Transmission Line Planning Process at European Level: Legal Framework and Need for Reforms -- The Spatiality of Germany's Energy Transition: Spatial Aspects of a Reconfiguration of An Energy System -- The Spatial Dimension of the Energy Transition: European Renewable Energy Sources-Local Resources and International Exchange -- Part VI. The Energy Transition Beyond the Electricity Sector -- Road Transport and Its Potential Inclusion in the EU ETS -- Energy Transition and Electromobility: A Review -- The Role of a Renewable Energy target for the Transport Sector Beyond 2020: Lessons Learned from EU Biofuel Policy -- Biomethane - Local Energy Carrier or European Commodity?.