You can configure a power policy for the virtual machines in a desktop pool if the virtual machines are managed by vCenter Server.
Power policies control how a virtual machine behaves when its associated desktop is not in use. A desktop is considered not in use before a user logs in and after a user disconnects or logs off.
You configure power policies when you create or edit desktop pools in Horizon Console.
Note: You cannot configure power policies for desktop pools that have non-vSphere machines or for floating instant-clone desktop pools. Floating instant clones are always powered on.