Repeated power outages in Southlake, Texas, have prompted local leaders to file a formal complaint with state regulators, saying the disruptions continued through some of the hottest months of the year. Here's what to know On August 11, Shawn McCaskill, the mayor of Southlake, Texas, sent a complaint letter to the Public Utility Commission of Texas, according to NBC5. The letter accuses Tri-County Electric Cooperative of persistent service probl…