Control System of an Entity

Embodiments of the invention relate to a control system of a first entity. The control system has a forecast module that creates a supply medium plan of a supply medium unit of the first entity. The supply medium unit is a supply medium consumer, a supply medium producer, and/or supply medium storage. The supply medium unit connects to a physical supply channel network. A peer-to-peer module receives at least one supply medium offer message of a further entity by communicating with a peer-to-peer application of a peer-to-peer network. The peer-to-peer module causes generation of a supply medium transaction agreement about the physical exchange of a supply medium between the first and further entity through the peer-to-peer application based on the supply medium plan and the supply medium offer message. A controlling module controls the supply medium unit in dependence of the generated supply medium transaction agreement.