A ship comprising
accommodation facilities having a first
power demand, a propulsion
system having a second
power demand, and a power
plant comprising: * a first high-temperature fuel
cell unit having a first rated power corresponding to the first
power demand, * a second high-temperature fuel
cell unit having a second rated power corresponding to the second power demand, * a primary heating / cooling circuit comprising a non-reacting heating /
cooling fluid and a flow control means controlling flow thereof, * a controller adapted to control reactant supply to the first fuel
cell unit, reactant supply to the second fuel cell unit and to control the flow control means, wherein the controller is adapted to operate the power
plant in a first operating mode in which the first fuel cell unit is operated at the first rated power, no reactants are supplied to the second fuel cell unit and the primary heating / cooling circuit transfers heat from the first fuel cell unit to the second fuel cell unit.