In a statement released this week, ConEd outlined the root cause of the outage earlier this month that left 72,000 customers without power on Manhattan’s Westside for five hours on July 13.
The blackout reached West 72nd Street on the north, West 30th Street on the south, the Hudson River on the west and 5th Avenue on the east. Power has since been fully restored.
ConEd says a flawed connection between some of the sensors and protective relays at the 65th Street substation was the cause. The problem is now corrected.
“Out of an abundance of caution, we have taken preventive measures by isolating similar relay equipment at other substations,” ConEd said. “We will analyze and test the equipment before we put it back in service. Our electrical delivery system continues to operate with multiple layers of relay protection.”