1 Journal for Cleaner Production, Vol 286, March 2021, 125448 1 https://doi.org/10.1016/j.jclepro.2020.125448 2 3 Planning zero-emissions ports through the nearly Zero Energy Port concept 4 Nikolaos Sifakis, Theocharis Tsoutsos 1 5 Renewable and Sustainable Energy Systems Laboratory 6 School of Environmental Engineering, Technical University of Crete 7 GR. 73100 TUC Campus, Chania, Greece 8 Abstract 9 This research work attempts to review and compare the available scientific literature, to 10 identify several crucial research opportunities, and to achieve the challenge of putting the 11 findings together to achieve the prospect of nearly Zero Energy Ports. High energy 12 demand and vital supply activities are characterizing ports; they are central hubs in the 13 transport of materials, passengers, vehicles, and cargo. The growing progress of 14 implementing the typical renewable energy installations in port areas and the need for 15 innovative smart energy systems attract port management authorities' attention to energy 16 matters. 17 The research team constructed a specific methodology to review the available literature 18 and viable solutions. All the reviewed measures were analysed and evaluated, 19 highlighting their pros and cons for future implementation alongside their economic or 20 technological maturity according to their cost-effectiveness and the expertise in each one 21 of them. The research gaps per reviewed sector were identified, and suggestions were 22 made in a future agenda for both port decision-makers and researchers. 23 1 Corresponding author, Theocharis.Tsoutsos@enveng.tuc.gr