Con Edison, the main provider of power for New York City and surrounding areas, issued a statement on Monday disclosing the results of their investigation into the July 13 blackout which plunged much of Manhattan’s West Side into darkness.

An official statement issued by the company on Monday detailed an investigation that reviewed 15 years of power data in NYC and stated in conclusion, “We identified a flawed connection between some of the sensors and protective relays at the substation. We have corrected that condition.”