A floating power plant includes a hull having a structure suitable for being movable at sea; a plurality of watertight bulkheads placed in the hull to a height of a freeboard deck, thus partitioning the interior of the hull into a plurality of watertight chambers; a power generating equipment for generating electricity, the power generating equipment including a plurality of parts separately installed in the watertight chambers; and a duct arranged to pass over the freeboard deck to couple the parts of the power generating equipment installed in the watertight chambers to each other. The floating power plant can economically supply electricity to a specific district or to a specific facility that temporarily uses electricity, and can minimize limitations caused by environmental regulations, and can be used as an emergency electric power source.