| Summary: | Orust Kretsloppsakademi is a nonprofit organisation, with a goal of annually generate the same amount of electrical energy that is consumed. Orust is an island on the west coast of Sweden, north of Gothenburg. The population of 15 000 reaches 40 000 during summer, due to the large amount of vacationer. The total electricity demand is 174 GWh a year with a maximum power need of 32 MW. This report presents an analysis for the plausibility of their plan and from a power system stability perspective, the effects on the electrical grid. The conclusion is that the restraints for development of power generation from wind, solar and wave generation, are the power systems capability to transfer power, primarily in the transformers of the grid. Various actions, such as constraints of power output at certain times, and clever location of generation facilities, reduces the utilisation rate of the line segments. In order to substantially decrease the utilisation rate of the line segments, the actions need to be combined. Executed simulations showed that Orust needs to be provided with reactive power, even if Orust is self-sufficient of active power, through its connection to the Swedish power system. The need for reactive power decreased when the feeding transformer allowed a reduced voltage in the regional network. Additionally, generation of reactive power could further increase the possibility for Orust to become self-sufficient on electricity generation.
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