Set Power & Sleep Settings

# Run as SYSTEM
# Run in 64-bit PowerShell
# Suitable for Intune or any RMM
# Power mode API requires Windows 11

$ErrorActionPreference = 'Stop'

# -----------------------------
# Desired settings
# -----------------------------
# Plugged in
$AcDisplayTimeoutSeconds   = 300    # 5 minutes
$AcSleepTimeoutSeconds     = 0      # Never
$AcHibernateTimeoutSeconds = 0      # Never
$AcPowerModeGuid           = 'ded574b5-45a0-4f42-8737-46345c09c238'  # Best Performance

# On battery
$DcDisplayTimeoutSeconds   = 180    # 3 minutes
$DcSleepTimeoutSeconds     = 900    # 15 minutes
$DcHibernateTimeoutSeconds = 18000   # 300 minutes
$DcPowerModeGuid           = '00000000-0000-0000-0000-000000000000'  # Balanced

# Base power plan must be Balanced for the power mode UI/slider
$BalancedPlanGuid          = '381b4222-f694-41f0-9685-ff5bb260df2e'

function Invoke-PowerCfg {
    param(
        [Parameter(Mandatory = $true)]
        [string[]]$Arguments
    )

    $proc = Start-Process -FilePath "$env:SystemRoot\System32\powercfg.exe" `
                          -ArgumentList $Arguments `
                          -Wait `
                          -PassThru `
                          -NoNewWindow
    if ($proc.ExitCode -ne 0) {
        throw "powercfg failed: powercfg $($Arguments -join ' ') ExitCode=$($proc.ExitCode)"
    }
}

# Win32 interop for documented power mode APIs
Add-Type -TypeDefinition @"
using System;
using System.Runtime.InteropServices;

public static class PowerModeNative
{
    [DllImport("powrprof.dll", SetLastError = true)]
    public static extern UInt32 PowerSetUserConfiguredACPowerMode(ref Guid PowerModeGuid);

    [DllImport("powrprof.dll", SetLastError = true)]
    public static extern UInt32 PowerSetUserConfiguredDCPowerMode(ref Guid PowerModeGuid);

    [DllImport("powrprof.dll", SetLastError = true)]
    public static extern UInt32 PowerGetUserConfiguredACPowerMode(out Guid PowerModeGuid);

    [DllImport("powrprof.dll", SetLastError = true)]
    public static extern UInt32 PowerGetUserConfiguredDCPowerMode(out Guid PowerModeGuid);
}
"@

function Set-PowerMode {
    param(
        [Parameter(Mandatory = $true)]
        [Guid]$AcModeGuid,

        [Parameter(Mandatory = $true)]
        [Guid]$DcModeGuid
    )

    $acResult = [PowerModeNative]::PowerSetUserConfiguredACPowerMode([ref]$AcModeGuid)
    if ($acResult -ne 0) {
        throw "PowerSetUserConfiguredACPowerMode failed with code $acResult"
    }

    $dcResult = [PowerModeNative]::PowerSetUserConfiguredDCPowerMode([ref]$DcModeGuid)
    if ($dcResult -ne 0) {
        throw "PowerSetUserConfiguredDCPowerMode failed with code $dcResult"
    }
}

function Get-PowerMode {
    $acGuid = [Guid]::Empty
    $dcGuid = [Guid]::Empty

    $acResult = [PowerModeNative]::PowerGetUserConfiguredACPowerMode([ref]$acGuid)
    if ($acResult -ne 0) {
        throw "PowerGetUserConfiguredACPowerMode failed with code $acResult"
    }

    $dcResult = [PowerModeNative]::PowerGetUserConfiguredDCPowerMode([ref]$dcGuid)
    if ($dcResult -ne 0) {
        throw "PowerGetUserConfiguredDCPowerMode failed with code $dcResult"
    }

    [PSCustomObject]@{
        ACPowerMode = $acGuid.Guid
        DCPowerMode = $dcGuid.Guid
    }
}

try {
    $osVersion = [System.Environment]::OSVersion.Version
    if ($osVersion.Major -lt 10) {
        throw "Unsupported Windows version."
    }

    Write-Output 'Setting active power plan to Balanced...'
    Invoke-PowerCfg -Arguments @('/setactive', $BalancedPlanGuid)

    Write-Output 'Setting display timeout values...'
    Invoke-PowerCfg -Arguments @('/setacvalueindex', 'SCHEME_CURRENT', 'SUB_VIDEO', 'VIDEOIDLE', $AcDisplayTimeoutSeconds)
    Invoke-PowerCfg -Arguments @('/setdcvalueindex', 'SCHEME_CURRENT', 'SUB_VIDEO', 'VIDEOIDLE', $DcDisplayTimeoutSeconds)

    Write-Output 'Setting sleep timeout values...'
    Invoke-PowerCfg -Arguments @('/setacvalueindex', 'SCHEME_CURRENT', 'SUB_SLEEP', 'STANDBYIDLE', $AcSleepTimeoutSeconds)
    Invoke-PowerCfg -Arguments @('/setdcvalueindex', 'SCHEME_CURRENT', 'SUB_SLEEP', 'STANDBYIDLE', $DcSleepTimeoutSeconds)

    Write-Output 'Setting hibernate timeout values...'
    Invoke-PowerCfg -Arguments @('/setacvalueindex', 'SCHEME_CURRENT', 'SUB_SLEEP', 'HIBERNATEIDLE', $AcHibernateTimeoutSeconds)
    Invoke-PowerCfg -Arguments @('/setdcvalueindex', 'SCHEME_CURRENT', 'SUB_SLEEP', 'HIBERNATEIDLE', $DcHibernateTimeoutSeconds)

    Write-Output 'Applying power scheme changes...'
    Invoke-PowerCfg -Arguments @('/setactive', 'SCHEME_CURRENT')

    Write-Output 'Setting power modes...'
    $acGuid = [Guid]$AcPowerModeGuid
    $dcGuid = [Guid]$DcPowerModeGuid
    Set-PowerMode -AcModeGuid $acGuid -DcModeGuid $dcGuid

    Start-Sleep -Seconds 2

    $modeCheck = Get-PowerMode

    Write-Output ''
    Write-Output 'Completed successfully.'
    Write-Output 'Configured values:'
    Write-Output '- Plugged in: Screen off 5 minutes, Sleep Never, Hibernate Never, Power mode Best performance'
    Write-Output '- On battery: Screen off 3 minutes, Sleep 15 minutes, Hibernate 300 minutes, Power mode Balanced'
    Write-Output ''
    Write-Output "Verification:"
    Write-Output "- AC power mode GUID: $($modeCheck.ACPowerMode)"
    Write-Output "- DC power mode GUID: $($modeCheck.DCPowerMode)"

    if ($modeCheck.ACPowerMode -ne $AcPowerModeGuid) {
        throw "AC power mode verification failed. Expected $AcPowerModeGuid, got $($modeCheck.ACPowerMode)"
    }

    if ($modeCheck.DCPowerMode -ne $DcPowerModeGuid) {
        throw "DC power mode verification failed. Expected $DcPowerModeGuid, got $($modeCheck.DCPowerMode)"
    }

    exit 0
}
catch {
    Write-Error $_.Exception.Message
    exit 1
}