PROBLEM TO BE SOLVED: To perform a simulation based on ship energy prediction and optimization on the assumption of even energy demand in a residential section for a large ship including a plurality of engines.SOLUTION: An energy optimization and utilization system makes demand prediction for propulsion electric power necessary in advance, a heating value necessary to heat accessories, and a heating value for air-conditioning on the basis of an energy prediction model in a ship including a residential section, a shipping schedule prepared in advance, and prediction information, and optimizes an output power ratio of each of a plurality of engines on the basis of the demand prediction. To this end, the system conducts a plurality of case studies based on restrictions of a route in advance, and extracts optimum conditions for energy consumption. The system predicts the propulsion electric power from the shipping schedule, time, the number of passengers, weather forecast, and hydrographic forecast using the inboard energy prediction model on the basis of the optimum conditions, and makes an overall inboard energy utilization plan. The system predicts a peak of the power consumption, re-plans shipping equipment operation time from the predicted peak, and cuts the peak of the energy consumption.
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