EcoMPV will deepen the knowledge about environmental challenges related to offshore PV installations, aiming at technical solutions to mitigate undesired consequences and maximize beneficial impacts. We will address knowledge gaps about (1) altered underwater light field, hydrodynamics, pelagic biogeochemistry and primary production, (2) the artificial habitat provision for colonizing fauna and fish, and (3) effects on carbon fluxes and sequestration. Advice for ecodesigning offshore PV installations, paving the way to its environmental licensing, will be formulated. The role of MARECO will primarily be focussed on artificial habitat provisioning and carbon dynamics.