This policy report outlines the group research on advocacy, decision-making, and EU policy change towards green energy transition and climate neutrality, focusing on resource- and energy-efficient buildings, as well as energy efficiency more broadly within the EU's Fit for 55 legislative packages. The research also includes analyses of advocacy and decision-making related to EU policy change for decarbonizing maritime shipping. The project explores how stakeholder coalitions shape policies for sustainable environments since decision-making is influenced by stakeholders and conflicts of interest. By providing better insight into EU policy change dynamics, this report offers valuable knowledge that can enhance policymakers' understanding of how to influence future EU policies on energy efficiency and building energy performance, as well as a clean energy transition more broadly, promoting Swedish interests. It highlights the complexity of decision-making in energy efficiency and climate impact reduction within the EU while also underscoring the influence of stakeholders and conflicts of interest. As a result, actors with inadequate grasp of political dynamics can hinder effective energy policy design and implementation, posing challenges to achieving climate goals and sustainable development. Similarly, since negotiations are key to advance regulation, it is found that less politicization and polarization facilitate deliberative negotiations and policy-oriented learning, among other things. Thus, strategic advocacy is crucial for Swedish policymakers aiming to successfully influence future EU energy and climate policies.