As part of the energy transition, the French government is planning the construction of Oﬀshore Wind Farms (OWFs) in Normandy. These OWFs will be integrated into an ecosystem already facing multiple anthropogenic disturbances. A holistic view of cumulated impacts (OWF construction, global warming and ﬁsheries) were developed on the Courseulles-sur-Mer’ ecosystem through the use of a qualitative mathematical modelling approach. This modelling approach provides the mean to consider alternative hypotheses about how the ecosystem structure and function aﬀects its dynamics. Alternative models were constructed to address the diﬀerent hypotheses regarding the behaviour of top predator (whether the top predators will be scared away by the OWF or attracted by the reef eﬀect), impacts of global warming and changes in ﬁsheries activities. Key ﬁndings from these analyses are that the OWF construction could lead to an increase in benthos species and ﬁsh benthos feeders whatever the perturbation scenario, while the predicted response of top predators was ambiguous across all perturbation scenario. Qualitative modelling results can play a vital role in decision making by improving long term planning for the marine environment but also as a tool for communication with the public and so contribute to a better acceptability of the Marine Renewable Energy (MRE) project.