How can circularity make the energy transition more affordable? In this study, CE Delft, in collaboration with Trinomics, shows that circular strategies not only reduce the use of raw materials and CO₂ emissions, but can also lower the costs of the future energy system. By making better use of existing housing, promoting shared mobility, and reducing demand for new steel and plastics, less investment is required in energy generation, energy infrastructure and energy technologies. Across the four sectors examined, the built environment, mobility, the plastics industry and the steel industry, annual savings could reach approximately € 2.8 billion by 2050, of which around € 925 million can be achieved directly through Dutch policy measures. The study highlights that circular economy policies can make an important contribution to a more affordable and sustainable energy transition.