The electric grid in many parts of the U.S. is already under strain due to rising demand from data centers and the slow construction of new power generation.

Winter storms and extreme cold are forecast to wallop the U.S. with snow and ice through the weekend. Prepare for power outages and transportation issues.

Impacts from what could be the most significant storm of winter are expected to begin on Friday, spreading ice, snow and cold across much of the U.S.