Texans urged to save energy as extreme heatwave strains power grid

Electricity demand expected to surpass supply as temperatures hit triple digits, shattering records

Texans sweltering under record temperatures and high humidity have been urged to conserve energy as the power grid struggles to cope with a surge in demand.

An extreme heatwave across the south-west and central US has led to searing temperatures since Friday, with heat warnings in place for millions of Americans until at least midweek.