When extreme heat hits, people turn to AC, but what if the grid fails? From France to the US, heat waves are pushing power systems to the limit, raising blackout risks and energy prices when electricity is needed most.

The heat wave threatens to overwhelm U.S. grids and may force some to change their plans on one of the busiest travel weeks of the year.

During extreme heat waves, power grids are more vulnerable to outages. Experts and utilities said there are many ways people can reduce the energy strain.

A massive heat wave across eastern US pushed electricity demand close to record levels on Friday, prompting the country's largest power grid operator to activate emergency…

When extreme heat hits, people turn to AC, but what if the grid fails? From France to the US, heat waves are pushing power systems to the limit, raising blackout risks and energy…

Power grids worldwide are struggling under intense heat waves and other extreme weather events — and in the US, outages are already happening. | World News

A hot and stormy Fourth of July weekend saw more than 20 cities hit record highs. While the grid was strained in some places, the power mostly stayed on.