The first wrongful death lawsuits have been filed against Electric Reliability Council of Texas Inc., or ERCOT, on behalf of two Texas residents who died during the mid-February winter storm.

The two cases add to at least three other lawsuits brought against several energy companies and ERCOT, which operates 90% of the state’s power grid. ERCOT is under fire for its decision to shut off power to millions of Texans as temperatures dipped into the single digits.