The Texas electric grid operator extended its call for residents and businesses to conserve power until Tuesday morning as a late arctic cold front that barreled as far as South Texas boosted the state's electricity consumption to a monthly record on Monday. The Electric Reliability Council of Texas (ERCOT), the state's primary grid, had issued a public call for conservation on Sunday evening, citing freezing temperatures that would strain available generation capacity. "With the continued cold weather, we expect conditions to remain tight, especially during the early evening tonight and early morning hours tomorrow," said Dan Woodfin, director of system...