Ice storms knocked out nearly half the wind-power generating capacity of Texas on Sunday as a rare deep freeze across the state locked up turbine towers while driving electricity demand to record levels, the state’s grid operator reported. Responding to a request from Governor Greg Abbott, President Joe Biden granted a federal emergency declaration for all 254 counties in the state on Sunday, authorizing U.S. agencies to coordinate disaster relief from severe weather in Texas. The winter energy woes in Texas came as bone-chilling cold, combined with snow, sleet and freezing rain, gripped much of the United States from the...