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Data reveals reliability impact of storm damage years after grid restoration

New field data from Exacter, Inc., a grid analytics company, is revealing a correlation between significant weather-related outage events and the subsequent near-term health of the overhead grid, confirming what many have believed for a long time -- major storms have a significant non-visible impact on grid health even after complete system restoration.
 
"In our post-storm analysis for a number of U.S. utilities, we are seeing a clear, measurable correlation between Major Event Days (MED) caused by severe weather and the reliability measurements of those utilities over the next two years," explained Geoffrey Bibo, Exacter president. "We've noticed that despite repairs and restoration of power after the storm¡¦there is unseen, unidentified damage to a system after a MED that eventually emerges in the form of equipment failure. The high winds, moisture, ice, and extreme temperatures that were part of the MED have broad impact on individual system components, even if they do not manifest in the form of an immediate outage."
 
The Whitehouse 2013 Executive Report on "The Economic Benefits of Grid Resilience to Weather Outages" clearly outlined that severe weather is on the rise, and the grid infrastructure is aging and vulnerable with over 70 percent of its conductors and transformers more than 25 years old. They believe attaining grid resiliency will require significant investment to strengthen the overhead infrastructure against future storms.
 
Utilities can impact grid resiliency by using a post-storm approach utilizing analytics to identify those portions of the grid that have been weakened and are most vulnerable to failure and then direct resources to those weakened areas of the system that would impact the most customers.
 
"Utilities have very accurate metrics on the damage and repairs that have been made to restore the system, however, they do not know the unseen, lurking issues exacerbated by the storm," said John Lauletta, founder and CEO of Exacter. "When you add the two numbers together, you have a very accurate picture of storm impact -- not to mention actionable data for prioritizing future grid resiliency improvements."
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