NOVELTY - The apparatus (81) has a time calculation part (81c) for calculating electric power generation possible time, in which a cogeneration apparatus continues electric power generation based on amount of hot water storage. Electric power feeding information regarding electric power supplied to a load is generated based on electrical storage power of a storage battery (62), the possible time of the cogeneration apparatus and power consumption of the load. An electric power feeding information generation part (81d) outputs the electric power feeding information to an alerting part.    USE - Apparatus for managing electric power supplied to a specific load and a general load from an electric power supply provider i.e. electric power company.    ADVANTAGE - The electric power feeding information generation part outputs the electric power feeding information to the alerting part, so that operation of the load during power failure period can be appropriately adjusted, electric power can be effectively utilized, stopping of the electric power supplied to the load during a power failure period can be suppressed, electric generating capacity of the cogeneration apparatus depending on amount of the hot water storage can be considered, and information regarding the electric power supplied to the load can be accurately alerted to a user.    DETAILED DESCRIPTION - The cogeneration apparatus is a fuel cell (63). The load is a specific load (80) and a general load (70). The alerting part is a display terminal (82). An INDEPENDENT CLAIM is also included for an energy management system.    DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram of an energy management system using an energy-management apparatus.'(Drawing includes non-English language text)'    Storage battery (62)    Fuel cell (63)    General load (70)    Specific load (80)    Energy-management apparatus (81)    Time calculation part (81c)    Electric power feeding information generation part (81d)    Display terminal (82)