In this project, the impact the Danish energy island have on the energy system is investigated. The predicted GHG reduction only corresponds to a 44 % reduction, which is not sufficient as Denmark made a binding goal of 70 %. Hence, it is investigated how much impact the 3 GW energy island have on the energy system and what configuration of electrolysers are favourable. To make a comprehensive analysis, both electrolysers and e-fuels are studied. Alkaline electrolyser cell and methanol is used for this project, as it is considered the best suited for the energy island along with the Danish energy system. In the analysis, three scenarios with different configurations is analysed, together with sensitivity analyses concerning infrastructure and electrolyser technology. When taking the future expansion of 10 GW wind capacity and the ability to have multilinked interconnectors in consideration, the most favourable configuration have electrolysis on the artificial island. Hydrogen is then transported through pipeline to main land, where hydrogen and carbon dioxide is synthesised to methanol. Though, the total costs are so close to each other, that the costs is not the determining factor, but more the system in general. The energy island of this configuration would lower the annual GHG emissions by 2.31 Mt, approaching the 70 % GHG reductions.