The Texas utility responsible for shutting off power to millions of Texas residents last week during a record winter storm now faces at least two lawsuits claiming negligence in its failure to prepare for the state’s power needs.

The lawsuits both seek punitive damages against the Austin-based Electric Reliability Council of Texas Inc., or ERCOT, which operates 90% of the state’s power grid. They claim the utility did not prepare residents about possible rolling blackouts and failed to winterize electrical equipment.