It is disclosed, inter alia. a device, comprising: at least one decoupling unit via which a micro grid comprising at least one energy source and at least one consumer is connected to a public power grid; and at least one sensor for determining one or more current and / or voltage parameters, in particular voltage and / or frequency, of the micro-grid and / or of the public power grid; wherein generated energy of the micro grid can be fed into the public power grid and / or generated energy of the public power grid can be fed into the micro grid, so that the generated electrical energy of the public grid can be used by the at least one consumer of the micro grid via the one or more current and / or voltage parameters which can be determined on the part of the at least one sensor, the micro-grid can be operated at least for a predefined period of time in a frequency deviating from the public power grid. Further disclosed is a system with one or more devices according to the invention.
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