Installation for transmitting electrical power between a wind farm arranged in an ocean or a sea and a land-based energy supply network having - a transformer, - a sea-based diode rectifier, - a sea-based or land-based coupling-in component, - a DC voltage connection, - a sea-based additional inverter, - energy supply means and - a land-based converter that can be connected to the energy supply network, said land-based converter being connected to the sea-based diode rectifier via the DC voltage connection, - wherein the diode rectifier is coupled to the wind farm via a sea-based AC voltage network, - wherein the energy supply means are provided for feeding electrical power into the sea-based AC voltage network, wherein the energy supply means have at least the DC voltage connection that extends at least partly into the ocean and that connects the sea-based AC voltage network to the sea-based or land-based coupling-in component, which is configured to feed power into the DC voltage connection, characterized in that - the installation furthermore comprises - a switch arrangement, - a filter unit and - a mechanical switch, and, furthermore, - the DC voltage connection is connected to the sea-based additional inverter by way of the switch arrangement, wherein the additional inverter has its AC voltage side connected to the sea-based AC voltage network by way of the mechanical switch and a tertiary winding of the transformer, the filter unit is provided on the AC voltage side of the diode rectifier, and the filter unit is formed exclusively from at least one wind turbine of the wind farm, wherein the at least one wind turbine is used for power factor correction and/or for compensating for harmonics of the fundamental frequency of the network voltage. - a transformer, - a sea-based diode rectifier, - a sea-based or land-based coupling-in component, - a DC voltage connection, - a sea-based additional inverter, - energy supply means and - a land-based converter that can be connected to the energy supply network, said land-based converter being connected to the sea-based diode rectifier via the DC voltage connection, - wherein the diode rectifier is coupled to the wind farm via a sea-based AC voltage network, - wherein the energy supply means are provided for feeding electrical power into the sea-based AC voltage network, wherein the energy supply means have at least the DC voltage connection that extends at least partly into the ocean and that connects the sea-based AC voltage network to the sea-based or land-based coupling-in component, which is configured to feed power into the DC voltage connection, characterized in that - the installation furthermore comprises - a switch arrangement, - a filter unit and - a mechanical switch, and, furthermore, - the DC voltage connection is connected to the sea-based additional inverter by way of the switch arrangement, wherein the additional inverter has its AC voltage side connected to the sea-based AC voltage network by way of the mechanical switch and a tertiary winding of the transformer, the filter unit is provided on the AC voltage side of the diode rectifier, and the filter unit is formed exclusively from at least one wind turbine of the wind farm, wherein the at least one wind turbine is used for power factor correction and/or for compensating for harmonics of the fundamental frequency of the network voltage.