It’s lights out for ERCOT’s CEO Bill Magness. He was fired Wednesday for his mismanagement of Texas’ power grid during last month’s sub-zero freezing temperatures which left over 4 million Texas residents without power and therefore, unable to heat their homes.

Magness has defended his decision to begin rolling blackouts to ease the strain on Texas’ power grid. He later refused to return power, saying the grid could end up being down for weeks or even months. At least 40 people died as a result of what some are calling one of the worst blackouts in US history.

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