power grid in the coming decades, and vast improvements are needed to enhance its reliability and ability to meet increasing electricity demands, experts say.

Why it matters: The effects of new weather extremes on the grid may be seen throughout the summer if intense heat waves trigger energy demand spikes that test the limits of power infrastructures nationwide, officials have warned.

Threat level: The North American Electric Reliability Corporation (NERC), a nonprofit that oversees the reliability of the North American power grids, warned in an as