The completely shipping sector is engaged toward the reduction of greenhouse gas emission. Both IMO and the EU already set their pathways along the GHG strategy aiming to reach a shipping sector fully carbon neutral. The two regulatory bodies issued a first set of requirements with further ones under preparation. High-Speed units will be indeed also involved by these efforts in a very specific way, considering their very peculiar operation profiles. In order to improve the carbon footprint for a high-speed craft, a reference unit (e.g. 50 mt in length) is considered, engaging innovative technologies and new fuels. Being the port infrastructures also part of the sustainable mobility, the interaction between the ship and the harbor facilities are also considered. Ships at berth generate their electricity depending on their own auxiliary engines, emitting air pollutants and creating noise. This makes ports a major and growing source of pollution. Therefore, using fuel cell, main aims of this paper are the shore-side power concept economic analysis and the shore-side power and environmental effect.