(CNN)A large section of Manhattan woke up Friday morning to a power outage, a Con Edison map shows.
Most of the affected areas were from the Upper West Side north to Harlem.
"There's NO power in Harlem/Morningside Heights (sic) area! I've never seen this...crazy!" Shalin Cuello tweeted with a video. Shortly after, she tweeted: "Power's back, woohoo!!!"
About 6:30 a.m. ET, Con Edison issued a statement that said, "We are investigating a problem on our transmission system that caused three networks in Manhattan to lose their electric supply at about 5:13 this morning. The supply has been restored to those networks on the Upper West Side, Harlem and the Upper East Side."
Subway service was affected, officials tweeted.