Top leadership at Texas is electric grid operator resigned on Tuesday after they were blamed for rolling blackouts during last week's deadly winter storm.

The board's chairman, vice chairman and several directors were among those who stepped down from their roles at the Electric Reliability Council of Texas were Air cot effective Wednesday, according to an official state notice.

Their resignations came the same day Air Kat was hit with a proposed class action lawsuit by customers who claim their power failed in freezing temperatures, leaving them without light, heat and drinkable water.

The lawsuit accuses Air Kat of failing to prepare the state's electric power grid for severe weather.

Dozens of Texans died in last week's freezing temperatures, and the state has launched investigations into what caused electrical systems to shut down.

State Governor Greg Abbott welcomed the resignations, noting Air Kat had assured it had adequate power ahead of the storm.

In a statement, he said investigations will uncover the full picture of what went wrong and added he'll insure it won't happen again.