Most household appliances are made to work on either frequency . The problem of incompatibility came into the public eye when the 2011 Tōhoku earthquake and tsunami knocked out about a third of the east 's capacity , and power in the west could not be fully shared with the east , since the country does not have a common frequency
2011 Tōhoku earthquake and tsunami
2011 Tōhoku earthquake and tsunami
Electric power distribution