A PowerDown schedule is used to define repeating needs for resources, but often, users have unexpected needs for extended access to resources that would normally be powered down. For example: an after-hours crunch time at the end of a sprint.
An override schedule is a one-time command to power on a resource for up to 24 hours. This will create an override schedule that will be automatically deleted when the scheduled time period completes.
You can also use the PowerDown CLI to create quick overrides:
power up test-server 4h
This will power up the "test-server" for 4 hours overriding any schedules. After 4 hours, the normal scheduled programming will resume.