A system-wide power outage that affected Yellowknife, Dettah and Behchoko is now reported to be over. Social Sharing CBC News · Posted: Jul 14, 2021 5:12 PM CT | Last Updated: July 15 The Northwest Territories Power Corporation office in Hay River, N.W.T. The corporation reported an outage affecting Yellowknife, Dettah and Behchoko on Wednesday afternoon.(NTPC) comments A system-wide power outage that affected Yellowknife, Dettah and Behchoko is now reported to be over. The Northwest Territories Power Corporation (NTPC) first announced the power outage on Twitter Wednesday afternoon, shortly after the outage was felt in Yellowknife. In an email, NTPC spokesperson Doug Prendergast said a "lightning strike" on the Snare hydro facility transmission line appeared to be the cause of the outage.