On June 29, 2012, a major storm system known as a derecho (“deh-REY-cho”) formed and moved across Illinois through the Ohio Valley and Mid-Atlantic States. The 2012 Derecho traveled about 600 miles in about 10 hours. Approximately 4.2 million customers were without power across 11 States and the District of Columbia and restoration in some cases took 7 to 10 days. The U.S. Department of Energy, Office of Electricity Delivery and Energy Reliability (OE), Infrastructure Security and Energy Restoration Division (ISER) publishes situation reports during energy emergencies and analyses of past energy emergency events to provide information to Federal, State, and local governments as well as the public. Due to the unique nature of this storm compared to traditional summer seasonal storms and the extent of physical damage caused, ISER developed a handy report to assess whether the restoration period from the 2012 Derecho was consistent with other major storms and, if not, what caused the differences in restoration times.
Released in August, the report is full of useful data. Exhibit 3 below highlights the impact of the 2012 Derecho storm.
Ultimately the ISER report concludes the 2012 Derecho was a unique storm due to its unforeseen intensity, area of impact, and post-storm conditions. As a result power restoration lagged compared to other major storms, including Hurricanes Ike and Irene.