A DRS cluster can be configured to change the power state of the selected hosts in order to reduce the power consumption by the cluster. This feature is called vSphere Distributed Power Management and is configurable only if the cluster is DRS-enabled.
DPM is disabled by default. You will need to edit the DRS cluster settings to enable DPM.
vSphere DPM uses IPMI for power management. Hence, for the ESXi hosts to be managed by DPM, they have to be configured with their corresponding IPMI settings. This has to be done at a per-ESXi host level under Manage | Settings | Power Management.
The following procedure will help you enable and configure DPM on a DRS-enabled cluster: ...