Survey Questions - Edison Electric Institute

Chapter 2: Storms and Outages
accumulation are the major cause of system outages during the winter. From these observations, it would
appear that underground facilities would be less prone to these types of major outage events. However,
underground facilities are also affected by these major storms, because most existing underground facilities
are supplied from overhead sections of the grid. So any event causing an overhead outage will also cause
outages on sections of underground facilities.
In Chapter 3, we will investigate reliability of both overhead and underground electrical facilities to
determine if customers served by either would experience any difference in service.
16 Edison Electric Institute