Less than a day after San Antonio Mayor Ron Nirenberg warned residents to prepare for possible rolling power outages, the state’s grid operator is again asking Texans to cut their energy use so it can avoid emergency measures. “Current forecasts are showing a potential to enter emergency operations this evening because of expected low wind-power generation and high demand,” the  Electric Reliability Council of Texas (ERCOT) said in a statement. “ERCOT will continue to closely monitor conditions throughout the day and will keep the public informed through our communication channels.”