Product : Citrix, XenServer/6.5, Commercial Edition
Feature : Power Management, VM Mobility, VM Mobility and HA
Content Owner:  Roman Macek
Yes Workload Balancing
Power management is part of XenServer Workload Balancing (WLB).

Background: Power Management introduced with 5.6 was able to automatically consolidate workloads on the lowest possible number of physical servers and power off unused hosts when their capacity is not needed. Hosts would be automatically powered back on when needed.