Patent ID: 7840829

Claim:
A power supply system, comprising: a plurality of electric transmission/distribution power lines which constitute a plurality of regional-scale power systems, respectively; a plurality of regional-scale power generating plants arranged to supply electric power to the plurality of electric transmission/distribution power lines, respectively; a plurality of abnormality detectors disposed in the plurality of electric transmission/distribution power lines and the plurality of regional-scale power generating plants, respectively; and a server disposed so that the server is capable of communicating through redundant communication media with a user terminal at a user site which is capable of receiving power from a local small-scale power system as well as the plurality of regional-scale power systems, including one regional-scale power system selected by making a switchover among the plurality of regional-scale power systems; wherein: the server collects information about abnormalities caused in the plurality of regional-scale power systems through other redundant communication media from the plurality of abnormality detectors disposed in the plurality of regional-scale power generating plants, each of which is part of one of the plurality of regional-scale power systems, and on the plurality of electric transmission/distribution power lines, each of which is also part of one of the plurality of regional-scale power systems; the server determines whether the regional-scale power system from which the user is currently receiving power is normal or abnormal; and if the regional-scale power system is abnormal, the server sends, to the user terminal, information about normal regional-scale power systems from which the user is able to receive power.