Even as millions of customers remained trapped in their homes with no power amid unprecedented Arctic weather conditions, the energy emergency gripping Texas sparked a furious blame-game over the role of wind power.

Texas's 33GW of wind, the largest of any US state, its thermal generation fleet, its network operator, its grid and its power companies were all in the firing line from various quarters as a furious row erupted across America over the shock crisis.

The main Texas grid operator late Tuesday struggled to restore electricity to millions of customers as a brutal winter storm with record cold temperatures spiked demand, while crippling fossil fuel generators and about two-thirds of rated wind capacity in the largest US state power market.