Grid operators told power providers to expand rolling blackouts again.įour minutes and 23 seconds after it dipped below 59.4 hertz, the frequency began to rise as more customers were dumped from the grid. Within minutes, the frequency fell to about 59.3 hertz. That may not sound much different than 60 hertz, but if the frequency stayed under that threshold for 9 minutes or more, ERCOT officials said, it would trigger that cascading failure of the grid. At about 1:51 a.m., the grid dropped below 59.4 hertz. Monday, the frequency of the grid was falling to dangerous levels. Still more power plants went offline because of the weather. And it can force more power plants to shut down - possibly leading to a complete failure of the grid.īut those initial rolling blackouts didn't solve the problem. That can cause physical damage to equipment that moves power around the state. If there's not enough power on the grid to meet demand, ERCOT officials said, the frequency of the grid drops below that 60 hertz level. The highest alert was triggered, and ERCOT ordered power providers to start rolling blackouts. By 1:23 a.m., one-third of the state's power-generation capacity was down. This triggered some power reductions for industrial customers that volunteer to have power turned off when supply gets scarce. ![]() At 1:07 a.m., ERCOT went to the second level. RELATED | Here Are Some Terms You Need To Know To Understand The Debate Over The Texas Blackoutīut that wasn't enough. Monday, ERCOT went to its first level of energy emergency alert. Equipment and pipelines were freezing up. Meanwhile, power plants across the state were going offline because of the cold weather natural gas, coal, nuclear and wind energy sources were all failing. ERCOT A timeline of Texas’ power grid frequency on the morning of Monday, Feb.
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