An energy management device is provided in a first energy related system
and manages transfer of energy between the first energy related system
and a second energy related system remote from the first energy related
system, each of the first and second energy related systems including, as
an energy related element, at least one of an accumulation unit which
accumulates energy, a consumption unit which consumes energy, and a
generation unit which generates energy. In the energy management device,
a communication unit exchanges information between the first energy
related system and the second energy related system, the information
related to at least one of the energy consumption, the energy
accumulation and the energy generation in each of the first and second
energy related systems. A supply control unit controls supplying of
energy from one of the first and second energy related systems to the
other based on contents of the exchanged information.