The Port of Rotterdam is currently undergoing a crucial energy transition, promoting the production of sustainable energy in the port to provide the Netherlands with clean energy. In current approaches, though, non-human species are severely underrepresented in the spatial design of the port. This makes the port inherently unsustainable because this approach destroys current ecosystems that are beneficial for the well-being of the space and the well-being of humans living and working in these spaces. (Jørgensen, 2009; Latour, 2012). This research builds on the Post-Anthropocene philosophy and expands on this concept by integrating spatial justice and an ecosystem approach into it. In this approach, we aim to create a design that considers humans and seagulls as inhabitants of one ecosystem. Based on spatial data about seagulls and humans, we create an analysis of the spatial needs of the two species. In the analysis, we also investigate differences in energy production sources and discuss which sources are spatially and ethically just. These analyses combined form the base of a just vision of the Port of Rotterdam during the energy transition. After this, we visualize the feasibility of the new vision for the port by creating a potential strategy to achieve the created vision. This strategy visualizes the timeline in which future policies and spatial interventions are represented. We zoomed in on three key projects, which we based on key principles our strategy aims to represent spatially. The report concludes with a discussion on how the research has impacted current energy transition approaches and reflects on the conceptual foundation this research builds upon. The reflection will additionally cover ethical constraints, this research’s impact on the Sustainable Development Goals (United Nations, n.d.), its relevance to science and society, the incorporation of public goods, and recommendations for further research.