People wait in line to fill propane tanks on Feb. 17 in Houston. Power grid problems left millions weathering conditions in the dark in uninsulated homes, intensifying the Texas winter storm’s deadliness.

People wait in line to fill propane tanks Wednesday, Feb. 17, 2021, in Houston. Customers waited over an hour in the freezing rain to fill their tanks. Millions in Texas had no power after a historic snowfall and single-digit temperatures created a surge of demand for electricity to warm up homes unaccustomed to such extreme lows, buckling the state’s power grid and causing widespread blackouts. (AP Photo/David J. Phillip)