When looking at the global climate challenges, the energy system is one of the biggest obstacles towards a carbon-free and net-zero future. The European Union has set ambitious objectives for an energy system, which integrates renewable energy and energy efficiency, as well as enabling a well-functioning energy market. These elements in combination can support a robust and flexible energy system, which is vital towards a clean energy system. The targets have been set, and the next important step is for all member states to implement the ambitions locally. In this implementation real-life, competitive and scalable solutions are vital to share and show toward an effective transition. Today it is evident, that many of the solutions, which are needed already exists. Furthermore, these solutions have over the last decades through innovative breakthroughs become competitive in a way that a green transition of the energy system can be cost-efficient. This is exemplified by the clean energy sources of offshore wind, onshore wind, solar, biomass and biogas energy technologies. A transition of the energy system that relies solely on renewable energy also requires a focus on the total amount of energy we consume. Both in industry and at the end user, energy efficiency measures exists which can achieve large savings in energy, costs and CO2 emissions. It is clear that there still lies many obstacles ahead in order to reach the objectives of the European Energy Union. By showcasing existing solutions and technologies, this publication seeks to support the dialogue with an action-oriented approach, which hopefully can contribute to a green transition of the European energy systems.