Top Texas utility regulator DeAnn Walker resigns following calls to step down FacebookTwitterEmail 1of2 Bill Magness, President and CEO of the Electric Reliability Council of Texas (ERCOT), testifies as the Committees on State Affairs and Energy Resources hold a joint public hearing to consider the factors that led to statewide electrical blackouts, Thursday, Feb. 25, 2021, in Austin, Texas. The hearings were the first in Texas since a blackout that was one of the worst in U.S. history, leaving more than 4 million customers without power and heat in subfreezing temperatures. (AP Photo/Eric Gay)Eric Gay, STF / Associated PressShow MoreShow Less