Survey Questions - Edison Electric Institute

Chapter 2: Storms and Outages
Hours
9
8
7
6
5
4
3
2
1
0
12 Edison Electric Institute
Figure 2.4 EIA Data: Hours of Interruptions
2003 2004 2005 2006 2007 2008 2009 2010 2011
Figure 2.5, EIA Data: Customers Out per Reported Storm, represents the average number of customers
experiencing an outage per storm. The outlier years for average number of customers experiencing an
outage per storm are 2005, 2007, and 2009. Data for the other years falls within one standard deviation of
±51.8 thousand customers. The data shows a decreasing trend for customers out per storm over the nine-year
period.
Customers Out per Reported Event
Thousands
Thousands
300
250
200
150
100
50
0
Years
Standard Deviation Range Designated
Figure 2.5 EIA Data: Customers Out per Reported Storm
2003 2004 2005 2006 2007 2008 2009 2010 2011
Years
Standard Deviation Range Designated