Outages are filed under the Census area nearest the fault ESB reported. A cut that hit O'Briensbridge-Montpelier may be listed under a neighbouring area, and one listed here may reach far beyond it - which is why a row can count more customers than O'Briensbridge-Montpelier has people.
The nearest areas with a page of their own - an outage close to the boundary may be filed under one of these.