You can configure a power policy for the virtual machines in a desktop pool if the virtual machines are managed by vCenter Server except instant clones.
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. Power policies also control how a virtual machine behaves after administrative tasks such as refresh, recompose, and rebalance are completed.
You configure power policies when you create or edit desktop pools in Horizon Administrator.
You cannot configure power policies for desktop pools that have unmanaged machines or instant clones. Instant clones are always powered on.