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    Texas grid vulnerable to blackouts in winter, ERCOT estimates


    November 23, 2021 - Erin Douglas

     

      Electricity outages in Texas could occur this winter if the state experiences a cold snap that forces many power plants offline at the same time as demand for power is high, according to an analysis by the Electric Reliability Council of Texas. The outages could occur despite better preparations by power plants to operate in cold weather.

      Heading into the winter, ERCOT considered five extreme scenarios in a risk assessment of the state's power supply. The grid operator estimates both how much electricity Texans are expected to demand and how much electricity power plants are expected to produce ahead of each season.

      Following the widespread February power outages that left millions without electricity for several days, ERCOT changed those assessments to calculate what would happen if extreme conditions occurred simultaneously – like what happened this year.

      The calculations show the power grid's vulnerability to the cumulative impact of multiple pressures that could leave the system short of a significant amount of power. Power grids must keep supply and demand in balance at all times. When Texas' grid falls below its safety margin of 2,300 megawatts of extra supply, ERCOT, the grid operator, starts taking additional precautions to avoid blackouts, such as asking residents to conserve power.

      The calculations for severe risk this winter show that it wouldn't take a storm as bad as the one in February, when hundreds of people died, to take the grid offline.

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