Abstract: An energy generating device for generating electric energy from an energy source, in particular a regenerative energy source, and for feeding the generated electric energy into a grid, in particular a power supply grid, comprises: a power converter for converting energy at its input into a grid compatible energy at its output, at least one electric line for electrically connecting the output of the power converter to the grid, a separation device for a potential separation of the power converter from the grid, a noise filter device for discharging high-frequency interference signals against a reference point, a measuring device for capturing discharge currents flowing over the noise filter element and for delivering a discharge current signal characterizing a respective discharge current, and a control device for controlling the switch elements of the separation device.