See update published May 28, 2019: How to Set Up Your Computer to Auto-Restart After a Power Outage ...

How to Set Auto Start-Up for a Computer. Windows computers that support advanced startup options in the BIOS can be set to start automatically on a schedule.

Thankfully, Windows 11 provides a few methods for setting a timer to shut down your PC, whether it's a one-time thing or you want to do it regularly.