The invention relates to a power supply device (1) for a ship (5) that is stationed on a mooring of a harbour. The power supply device comprises a land-based, horizontally displaceable (30) carriage (9), on which a power supply line (11) with a plug (15) is arranged for supplying the ship with electrical energy. The power supply line (11) can be electrically connected to a land-based power supply network (32). A plug-sided section (13) of the power supply line is arranged in a vertically displaceable manner on the carriage (9).
