Windows Disable Sleep on AC Power Script

<#
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to your production environment. We welcome contributions to our community 
library

Level Library
https://level.io/library/script-windows-disable-sleep-on-ac-power
#>

# Disable sleep on AC power
Write-Host "Disabling sleep on AC power..." -ForegroundColor Green

# Method 1: Using powercfg with correct syntax (recommended)
try {
    # Set the AC power setting for sleep timeout to never (0 minutes)
    $result = powercfg /change standby-timeout-ac 0
    
    if ($LASTEXITCODE -eq 0) {
        Write-Host "Sleep on AC power has been disabled successfully." -ForegroundColor Green
    } else {
        throw "PowerCfg command failed with exit code: $LASTEXITCODE"
    }
} catch {
    Write-Host "Method 1 failed. Trying alternative method..." -ForegroundColor Yellow
    
    # Method 2: Using GUID-based approach
    try {
        # Get the current active power scheme GUID
        $currentScheme = (powercfg /getactivescheme).Split()[3]
        
        # Set sleep timeout on AC to 0 (never) using GUIDs
        # SUB_SLEEP GUID: 238c9fa8-0aad-41ed-83f4-97be242c8f20
        # STANDBYAC GUID: 29f6c1db-86da-48c5-9fdb-f2b67b1f44da
        powercfg /setacvalueindex $currentScheme 238c9fa8-0aad-41ed-83f4-97be242c8f20 29f6c1db-86da-48c5-9fdb-f2b67b1f44da 0
        
        # Apply the changes
        powercfg /setactive $currentScheme
        
        if ($LASTEXITCODE -eq 0) {
            Write-Host "Sleep on AC power has been disabled successfully using alternative method." -ForegroundColor Green
        } else {
            throw "Alternative method also failed"
        }
    } catch {
        Write-Host "Failed to disable sleep on AC power. Please check your permissions or try running as Administrator." -ForegroundColor Red
        Write-Host "Error details: $($_.Exception.Message)" -ForegroundColor Red
    }
}

# Verify the change
Write-Host "`nVerifying changes..." -ForegroundColor Cyan
try {
    $verification = powercfg /query SCHEME_CURRENT SUB_SLEEP STANDBYAC 2>&1
    
    # Check if Group Policy is overriding settings
    if ($verification -match "Group policy override settings exist") {
        Write-Host "WARNING: Group Policy is controlling power settings on this system." -ForegroundColor Yellow
        Write-Host "The script may have applied changes, but Group Policy will override them." -ForegroundColor Yellow
        Write-Host "Contact your IT administrator to modify Group Policy power settings." -ForegroundColor Yellow
        
        # Try to show what the effective setting would be without GP
        Write-Host "`nAttempting to show configured setting (may differ from effective setting due to GP):" -ForegroundColor Cyan
        powercfg /query SCHEME_CURRENT SUB_SLEEP STANDBYAC 2>$null | Select-String -Pattern "Current Setting"
    }
    elseif ($verification -match "Invalid Parameters") {
        Write-Host "Unable to verify due to parameter issues. Trying alternative verification..." -ForegroundColor Yellow
        
        # Alternative verification using export
        $tempFile = [System.IO.Path]::GetTempFileName()
        powercfg /export $tempFile 2>$null
        if (Test-Path $tempFile) {
            Write-Host "Settings export successful - changes likely applied." -ForegroundColor Green
            Remove-Item $tempFile -Force
        }
    }
    elseif ($verification -match "Current Setting.*0x00000000") {
        Write-Host "Verification successful: Sleep on AC power is disabled (0 minutes)" -ForegroundColor Green
    }
    else {
        Write-Host "Current AC sleep timeout setting:" -ForegroundColor Yellow
        $verification | Select-String -Pattern "Current Setting" | ForEach-Object { Write-Host $_.Line -ForegroundColor White }
    }
} catch {
    Write-Host "Could not verify the setting change: $($_.Exception.Message)" -ForegroundColor Yellow
}

# Additional Group Policy check
Write-Host "`nChecking for Group Policy restrictions..." -ForegroundColor Cyan
$gpResult = gpresult /r /scope:computer 2>&1 | Select-String -Pattern "Power Management"
if ($gpResult) {
    Write-Host "Group Policy power management settings detected:" -ForegroundColor Yellow
    $gpResult | ForEach-Object { Write-Host "  $($_.Line)" -ForegroundColor White }
}