For years users have enjoyed Low Power Mode on their iPhones. With macOS Monterey, Apple now has a similar feature for the Mac.
On the Mac, Low Power Mode is compatible with the MacBook (Early 2016 and later) and MacBook Pro (Early 2016 and later).
This feature can be enabled from System Preferences > Battery > Battery > Low Power Mode. Once enabled, your Mac will reduce energy usage to increase battery life.