ELECTRIC POWER SYSTEM

A CEMS server obtains meteorological information and hydrogen station information. The CEMS server predicts a power demand of a microgrid after a designated period. When the power demand of the microgrid after the designated period exceeds contract power and when an amount of electric power to be reduced exceeds a prescribed value, the CEMS server generates a hydrogen addition notification and transmits the generated hydrogen addition notification to an FCEV and/or a communication terminal. The amount of electric power to be reduced is a difference between the contract power and the power demand.