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.