Tens of thousands of Texans were without power Tuesday morning, but the statewide electric grid wasn’t to blame. With the current cold snap’s most frigid temperatures still to come, electricity demand already has had its biggest spike since last January.

Snow, sleet and freezing rain across Central and South Texas could bring down power lines, causing localized outages beginning Monday evening.

Below-freezing temperatures will return to Texas as soon as Jan. 18, according to the National Weather Service. Grid conditions are expected to be normal and officials do not anticipate an emergency,

ERCOT leaders said they've been keeping a close eye on the state's power grid during the extremely cold weather across Texas.

According to Operations Messages on the ERCOT website, around 5 a.m. ERCOT issued a Transmission Emergency in South and Southeast Texas.

Areas around Houston could receive up to six inches of snow, which would rank among the heaviest snowfalls ever for the city. Winter Storm Warnings stretch as far south as the Rio Grande.