Offshore Geothermal Energy can be considered as a non-polluting source of renewable energy, in relation to harmful emissions that are associated with burning fossil fuels to generate electricity. The geothermal brines of the mid-ocean ridge hydrothermal vents are believed to be potential sources of offshore geothermal energy. These fluids represent one of the most abundant energy resources worldwide, due to their enormous quantity, infinite recharge, and high temperatures. However, all forms of electricity generation impact the environment in some way. The ecological and biological importance of the vents restricts the number of areas that can be utilized to produce electricity. Most of the marine areas with these vents are benefitted with some form of protection. Most of them are included in the networks of marine protected areas (MPAs), which stands as the foundation of marine conservation policies. While most of the scientific studies focused on quantifying the exploitable energy from the hydrothermal vents, the environmental impacts of harvesting the energy from these vents have not been explored till date and remained unanswered. For the offshore geothermal energy to develop, the uncertainties about the effects on the marine environment must be assessed. Therefore, this study attempts to assess the potential environmental impacts using the MOHID framework of hydrodynamic modelling along with some personal views and assumptions from various studies. This is the first of its kind of study in the offshore geothermal energy production, and the results demonstrate the marine ecological footprint that could quantify the impact on the marine environment by exploiting hydrothermal vents for energy production.