What is powerd on Mac?

What it does

It decides when the Mac and display can sleep, wakes the Mac for scheduled tasks, and tracks power assertions, which are requests from apps to stay awake during a download, a call or a video. It also works with battery features like Optimized Battery Charging on laptops.

Why it gets busy

• Apps creating and releasing keep-awake requests rapidly.
• Frequent wakes from sleep, for example for network access.
• A charger, cable or adapter that keeps connecting and disconnecting.

Why is powerd using so much CPU?

powerd handles sleep, wake and keep-awake requests. High use usually means an app is toggling those requests constantly or the Mac keeps waking, and pmset -g assertions shows which app.

Is it safe to quit?

macOS relies on it for sleep and battery handling. It's restarted automatically, and quitting doesn't fix the cause.

The real powerd runs from /System/Library/CoreServices/powerd.bundle.

How to calm it down

1. Run pmset -g assertions in Terminal to see which apps are keeping your Mac awake. It only reads information.
2. If you don't need it, turn off Wake for network access in System Settings › Battery › Options… (on a desktop Mac, System Settings › Energy).
3. Try another charger or cable if charging keeps starting and stopping.

In SystemWatch

SystemWatch's History shows whether powerd's activity lines up with your Mac waking from sleep, which separates a wake problem from an app problem.