NOVELTY - Assembly comprises: at least one energy-generating system (1); at least one electrolyzer (2) to produce hydrogen from water; at least first chemical reactor (3) for hydrogenation of substrate in form of a liquid organic hydrogen carrier, preferably a substrate having an extended pi -conjugated system; at least first storage tank (4) for storing hydrogenated substrate; at least second chemical reactor (5) for dehydrogenation of hydrogen and storage tank for storing hydrogenated substrate with release of hydrogen; and at least one fuel cell to oxidize released hydrogen with release of energy.    USE - The assembly is useful for power supply in ships, preferably for driving the ships (claimed).    ADVANTAGE - The assembly requires relatively small space and utilizes pressure-free tank at high energy density in a ship.    DETAILED DESCRIPTION - Assembly comprises: at least one energy-generating system (1) in the form of a renewable energy source, preferably a photovoltaic system and/or a wind-powered system, to provide an electrical power; at least one electrolyzer (2) for the production of hydrogen from water using the electrical power; at least first chemical reactor (3) for at least partial hydrogenation of at least one substrate in the form of a liquid organic hydrogen carrier, preferably a substrate having an extended pi -conjugated system, formed by using the electrolyzer; at least first storage tank (4) for storing at least partially hydrogenated substrate; at least second chemical reactor (5) for at least partial dehydrogenation of the produced hydrogen in the first chemical reactor and storage tank for storing at least partially hydrogenated substrate with release of hydrogen; and at least one fuel cell for oxidizing released hydrogen with release of energy in the second chemical reactor. An INDEPENDENT CLAIM is also included for supplying power to ships, preferably for driving the ships, using the assembly, comprising: providing an electrical power, preferably a direct power, comprising at least one renewable energy source, preferably a photovoltaic system and/or wind-powered system; producing hydrogen from water in the electrolyzer using the electrical power; transferring the formed hydrogen into the first chemical reactor comprising the substrate; transferring at least partially hydrogenated substrate from the first chemical reactor and optionally storing in the storage tank; transferring the hydrogenated substrate from the storage tank into the second chemical reactor, and dehydrating the hydrogenated substrate with release of hydrogen; recycling the dehydrated substrate in the first chemical reactor; and transferring the released hydrogen from the second chemical reactor into the fuel cell and oxidizing the hydrogen in the presence of water present in the fuel cell, to form water and at the same time, to release energy in form of electricity and heat, if applicable.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic representation of the assembly.    Energy-generating system (1)    Electrolyzer (2)    First chemical reactor (3)    First storage tank (4)    Second chemical reactor (5)