Cause of weekend NYC outage still unknown; ConEd to investigate why grid failed to isolate probem

Source: By Robert Walton, Utility Dive • Posted: Tuesday, July 16, 2019

ConEd officials describe the weekend blackout as “a significant transmission disturbance,” but are still seeking the root cause — as well as why the system did not take steps to isolate the failure and keep power online.

“Our engineers and planners will analyze why equipment wasn’t isolated the way it would normally be in response to a transmission disturbance of this type,” spokesman Allan Drury told Utility Dive.

The blackout struck on the anniversary of a much-larger event. In 1977, a power outage left much of New York City without power for more than 24 hours.

Consolidaed Edison said that at its height, the weekend blackout left approximately 72,000 customers without power — concentrated in an area that reached from West 30th Street to West 72nd Street, and from the Hudson River to 5th Avenue.

“With all customers back in service, the company will focus on investigating the cause of the equipment failures and on getting the electrical-delivery system back to its normal level of reliability,” the utility said in a statement.