KETR updated, 9:50 p.m. Thousands of people in Northeast Texas remain without electrical service as of Monday afternoon, as a night of record low temperatures approaches, with readings forecast to fall below zero across most of the region. The outage-tracking website poweroutage.us reports amost one in three Oncor customers being without power as of late afternoon Monday. "There are two major issues affecting many customers right now: winter storm outages & controlled power outages directed by the Electric Reliability Council of Texas," Oncor said in a late-afternoon release Monday. Most of Texas is served by the state’s own electrical grid, which is managed by the Electric Reliability Council of Texas (ERCOT). Oncor is one of many private electricity providers that deliver power through ERCOT’s systems. Other power providers in Northeast Texas include Greenville Electric Utility System, Farmers Electric Cooperative, Texas-New Mexico Power Company, and others.