To get info on the current settings of your hosts:
Get-VMHost | Sort | Select Name,
@{ N="CurrentPolicy"; E={$_.ExtensionData.config.PowerSystemInfo.CurrentPolicy.ShortName}},
@{ N="CurrentPolicyKey"; E={$_.ExtensionData.config.PowerSystemInfo.CurrentPolicy.Key}},
@{ N="AvailablePolicies"; E={$_.ExtensionData.config.PowerSystemCapability.AvailablePolicy.ShortName}}
Name CurrentPolicy CurrentPolicyKey AvailablePolicies
---- ------------- ---------------- -----------------
esxihost0021.domain.local static 1 {static, dynamic, low, custom}
esxihost0022.domain.local static 1 {static, dynamic, low, custom}
esxihost0033.domain.local off 0 static
esxihost0034.domain.local off 0 static
esxihost0041.domain.local static 1 static
esxihost0062.domain.local dynamic 2 {static, dynamic, low, custom}
esxihost0063.domain.local dynamic 2 {static, dynamic, low, custom}
Note: CurrentPolicy off indicates that the host does not support OS-controlled power management or you set the host BIOS to a specific power management policy like static high performance already.
To set the power policy for a host:
$view = (Get-VMHost esxihost24.domain.local | Get-View)
(Get-View $view.ConfigManager.PowerSystem).ConfigurePowerPolicy(X)
Where X equals the key of the policy you want to set (1=static, 2=dynamic, 3=low, 4=custom)