  We describe a new system for a society of highly advanced civilizations
around a super massive black hole (SMBH), as an advanced Type III "Dyson
Sphere", pointing out an efficient usage of energy for the advanced
civilizations. SMBH also works as a sink for waste materials. Here we assume
that Type III civilisations of Kardashev classification [1] form a galactic
club [2] in a galaxy, and the energy from the SMBH will be delivered to the
club members, forming an energy control system similar to power grids in our
present society. The energy is probably transmitted by a sharp beam with
coherent electro-magnetic waves, which provide a new concept for the search for
extraterrestrial intelligence (SETI) via detection of such energy transmission
signals. This expands the search window for other intelligences within the
Universe.
