In this thesis, advanced energy planning of the transport sector on the Krk island, is concerned with the possbility of implementation of electricity into the transport of the island Krk. A computer simulation tool called SUMO was used as a substrate in which a traffic network of the island Krk was inserted. In order to have a more realistic view of the transport sector of the island, the movement of residents and visitors was established. Data were collected on vehicles that are analyzed and the vehicles were classified by category and type of fuel. Thanks to the Croatian Telecom, data on the movement of the population by base stations was obtained. With the help of the mentioned base stations, the matrices of the movement for an anverage day for the inhabitants and the visitors were made. By applying SUMO,a simulation was carried out for the present state of transport of the island of Krk. In simulations of the current state of traffic of the island of Krk, instead of the prevailing internal combustion vehicles, simulated implementation of electric vehicles of various categories and proportions was further simulated. As a result of the simulation of the use of electric vehicles in traffic, electricity consumption of electric vehicles was obtained, as well as the parameters and power of charging stations necessary to cover the above mentioned needs. Concretely, specific greenhouse gas emission savings are calculated and presented, which can contribute to the achievement of the goal, so that the island of Krk becomes CO2 neutral.