Operational hydrodynamic models are run daily in an operational automated system at the Marine Institute to produce both hindcasts and forecasts to build up a database of modelled data to support marine research. The operational modelling suite at the MI is based on the open-source community driven Regional Ocean Modelling System (ROMS) for ocean physics and Simulating WAves Nearshore (SWAN) and use operationally available atmospheric and open ocean boundary forcing data. The Marine Institute are also responsible for the biogeochemical modelling service within the framework of the Copernicus Marine Environment Monitoring Service. The biogeochemical model used is PISCES. Downstream modelling services include the areas of aquaculture, fisheries, oil spill modelling, search and rescue, storm surges and climate studies. The presentation will outline the set-up of the models and an will provide an overview of the downstream services.