The chair and four other members of the Texas power grid operator’s board are resigning after blackouts left millions across the state without electricity and heat during a deep freeze last week.

The Electric Reliability Council of Texas said in a regulatory filing Tuesday that chair Sally Talberg will resign effective Wednesday, alongside vice-chair Peter Cramton and board members Vanessa Anesetti-Parra, Raymond Hepper and Terry Bulger.

Texas Gov. Greg Abbott last week called for an investigation into Ercot and said its leaders and board members should step down. State leaders and residents have criticized the grid operator for employing a number of directors who reside out of state.

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