The Texas power grid system, which failed during a winter storm five years ago, could be put to the test this weekend as the region faces subfreezing temperatures and dangerous wind chills.

A major winter storm bringing heavy snow, sleet and freezing rain will impact millions across the country, including Texans.

"Oncor continues to closely monitor and respond to initial impacts from the ongoing winter storm, which continues to bring below-freezing temperatures and a wintry mix of precipitation across our serv...