Occasionally a small creature, squirrels or snakes can get into substations and cause an outage when they climb on circuit breaker, transformers or other equipment, I have seen this many times. I mentioned above the connections of new areas will occasionally require electric facilities to be de-energized for safety reasons. Of course you can have the occasional accidental digin from construction in the area or equipment failure. Just prior to our moving into our new home there were 5 interruptions, most if not all (as I recall) were due to the building of new homes just south of us. The power has been exceptionally reliable since.
Give SECO a couple of days and there will probably be a report.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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