For delivery groups with static VDAs we may not be able to configure power management in Studio, in this scenario, we can use PowerShell to manage the power settings.
PowerShell command:
Set-BrokerPowerTimeScheme

For example, if customer wants to the entire day as peak hours, we can use parameter -PeakHours followed by 24 $true.
Set-BrokerPowerTimeScheme -Name "DeliveryGroupName_Weekdays" -PeakHours $true,$true,$true,$true,$true,$true,$true,$true,$true,$true,$true,$true,$true,$true,$true,$true,$true,$true,$true,$true,$true,$true,$true,$true
Set-BrokerPowerTimeScheme -Name "DeliveryGroupName_Weekend" -PeakHours $true,$true,$true,$true,$true,$true,$true,$true,$true,$true,$true,$true,$true,$true,$true,$true,$true,$true,$true,$true,$true,$true,$true,$true


For more detailed use of "Set-BrokerPowerTimeScheme" please refer to:
https://developer-docs.citrix.com/projects/citrix-virtual-apps-desktops-sdk/en/latest/Broker/Set-BrokerPowerTimeScheme/