The essence of this report can be summarised as follows: -The main objective of this study is to define and quantify the costs and benefits of different power generation alternatives for ships in port, and to establish under what conditions a fuel cell power supply system could become an attractive investment in the future. - The following power generation systems were selected for comparison: Diesel generator, Polymer Exchange Membrane Fuel Cell (PEMFC), Molten Carbonate Fuel Cell (MCFC), Solid Oxide Fuel Cell (SOFC), Dual Fuel Diesel Generator (DF) and Electrical Shore Connection (ESC). - The following main aspects were selected for comparison: System Price, Technical Life Time, Cost of Operation & Fuel, Air Emission Performance, and Noise/Vibrations. - At the present situation two technologies were identified as commercially competitive power generation alternatives for ships in port: Electrical shore connection (ESC) and Dual fuel diesel engines burning natural gas. - Whereas offering significant environmental benefits in terms of reduced air emissions and low noise, today´s fuel cells have significant drawbacks in terms of high investment cost and limited technical life time. - In a longer perspective high temperature fuel cells in particular have very promising prospects, based on projected improvements with regard to efficiency, cost and durability in combination with their ability to burn various types of fuel. Demonstration trials with this technology are underway. - Low temperature fuel cells have the advantage of high power density and low complexity, which over time could make them an attractive alternative for power generation and propulsion of smaller vessels and leisure craft. - With regard to using hydrogen as fuel several issues need to be addressed, such as: Storage, transportation and safe handling. The relatively high cost compared to other fuels indicates that a shift to Hydrogen could only be motivated by substantial incentives, e g in the form of CO2 emission reduction trading.