This is untrue, power demand has been largely flat since the 2000s.

Efforts at efficiency, moving away from incandescent bulbs (ludicrously inefficient), and other changes have had significant effects:

https://www.statista.com/statistics/201794/us-electricity-consumption-since-1975/

We're having an increase now, likely from EVs, but understand the time of demand also matters, solar panels are most effective almost at the exact time we have the highest demand from air conditioning, and in the same locations, which dramatically reduces the need for peaker plants.

The downsides are our utilities have become less efficient from bureaucracy and political exploitation (great place to put an idiot nephew and get kickbacks from).

We need to decentralize the grid more, which utilities are fighting tooth and nail.