These energy communities may typically exist in local communities, at the countryside on Gotland, where citizens unite in creating common energy platforms. The challenge we would like to put forward is to simulate the potential advantages with a decentralised energy system and through that show also how the parties involved, primarily investors in decentralised solutions (energy communities) and DSOs, can develop mutually beneficial business models. In short, we wish to illustrate the values of flexibility in a regional distribution net (like Gotland).