NYC utility probes electric flash that lit sky in eerie blue

In this photo provided by Con Edison, workers walk in a power substation, Friday, Dec. 28, 2018 in the Astoria section of Queens, New York. Thursday night a high-voltage equipment failure at the substation unleashed an otherworldly flash of bright blue light in the night sky over New York City. (Con Edison via AP)

In this image taken from video, the night sky is illuminated in a bright, blue color after an explosion in the Queens borough of New York, Thursday, Dec. 27, 2018. New York police say a transformer exploded at a Con Edison facility in Queens. The explosion caused a bright, blue light that illuminated the New York skyline and caused a stir on social media. (AP Photo/Sophie Rosenbaum)

In this photo provided by Con Edison, workers walk in a power substation, Friday, Dec. 28, 2018 in the Astoria section of Queens, New York. Thursday night a high-voltage equipment failure at the substation unleashed an otherworldly flash of bright blue light in the night sky over New York City. (Con Edison via AP)

In this photo provided by Con Edison, workers walk in a power substation, Friday, Dec. 28, 2018 in the Astoria section of Queens, New York. Thursday night a high-voltage equipment failure at the substation unleashed an otherworldly flash of bright blue light in the night sky over New York City. (Con Edison via AP)

In this image taken from video, the night sky is illuminated in a bright, blue color after an explosion in the Queens borough of New York, Thursday, Dec. 27, 2018. New York police say a transformer exploded at a Con Edison facility in Queens. The explosion caused a bright, blue light that illuminated the New York skyline and caused a stir on social media. (AP Photo/Sophie Rosenbaum)

NEW YORK — Electric utility Con Edison was working Friday to figure out what caused a high-voltage equipment failure that unleashed an otherworldly flash of bright blue light in the night sky over New York City.

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