Pole Fire Cuts Power to 9,000 in NW Indiana, Darkening Signals on U.S. 41

Q: What caused the crucial power line sleeves to fail right after Indiana residents finally got their electricity back?

The immediate cause appears to have been the failure of sleeves on some power lines, which utility contractors told Schererville Fire Chief Robert Patterson likely caused the lines to slip or fall, triggering the pole fire and transformer explosions. Officials have not reported a final root-cause determination for why the sleeves themselves failed. But the incident came while NIPSCO’s system was under exceptional strain from the earlier derecho, which caused widespread damage to poles, lines, substations and other grid equipment across northwest Indiana. In that context, the sleeve failure is being treated as a likely equipment breakdown within a storm-damaged and heavily stressed power network. Witness accounts and local reports also pointed to a main line slipping out of its sleeve, which is consistent with what fire officials said at the scene. That line damage then led to the cascading outage affecting roughly 9,000 customers across Schererville, Dyer, St. John, Highland, Munster and nearby areas. So, based on the available reporting, the crucial sleeves did not fail because residents had just regained power; rather, they appear to have given way on damaged or stressed power-line infrastructure still recovering from the historic storm. No more specific mechanical explanation had been publicly confirmed at the time.

2 articles · Updated · NBC Chicago · Aug 21

About 9,000 NIPSCO customers lost electricity Thursday after a fire on an electrical pole near U.S. 41 and Main Street in Schererville brought down power lines.
Downed lines shut off traffic lights along U.S. 30 and U.S. 41, and police urged drivers to avoid the area because of heavy congestion while crews assessed damage.
Schererville, St. John and Highland reported outages, and Schererville Town Hall also lost power, leaving many municipal services unavailable.
No restoration timetable was given as NIPSCO crews, firefighters and city officials responded, with the utility still recovering from last week's derecho.