The Interreg 2 Seas project is an international cooperation aimed at making ports more sustainable. Research is taking place at and for the benefit of port locations in Ostend Portsmouth, Dunkirk, Hellevoetsluis and IJmond. The knowledge partners within PECS (University of Ghent, University of Southampton, Cerema and the HZ) are jointly developing sustainable options aimed at energy saving, generation of sustainable energy, energy storage and use of energy.