Renewable energies are those derived from the natural resources. Their availability and ability to replenish cause less damage to the environment and generate low CO2 emission made them evolve as one of the important sources of energy all over the world. Their benefits also include the savings in economy and their being environment friendly. Ports are important part of a nation’s economy. They still serve as unavoidable link in trade worldwide (PIANC Report on Renewable and energy efficiency for Ports 2019.). Hence, the principals of sustainability must be implemented in the ports sector too. To achieve sustainability, we must integrate the renewable energy to the port’s energy usage. Various renewable energies include wind, solar, waves, tides, ocean thermal energy conversion, and salinity gradient. Waves, tides, OTEC, salinity gradient fall under marine renewable energy. The proximity of ports to the sea and the large open area makes them more suitable for utilizing renewable energies. Feasibility study, energy usage study, research on overcoming the obstructions, development of site-specific devices, etc., will surely make renewable energy more reachable to the port community and thus the goals of greener ports can be easily achieved.