As a heat wave blankets much of the U.S., utilities are managing to keep up, for now

Power transmission lines span toward San Antonio, Texas. More than 100 million people are currently under heat-related warnings and advisories across the United States, the National Weather Service Weather Prediction Center said Tuesday. (Nick Wagner/Xinhua News Agency via Getty Images)

With a record-setting heat wave scorching much of the U.S. and expected to stretch into next week, electrical utilities are maneuvering to keep up with demand.

The warnings of possible rolling blackouts for this summer haven't come to pass. But tens of millions of people in numerous states across the country are under heat warnings or advisories, and the task of powering air conditioners on overdrive hasn't been easy.