Turn off the display (plugged in): registry value ACSettingIndexComputerHKLM\Software\Policies\Microsoft\Power\PowerSettings\3C0BC021-C8A8-4E07-A973-6B14CBCB2B7E

Policy ID: VideoPowerDownTimeOutAC_2
Scope: Computer Configuration
Supported on: At least Windows Vista
Source: Administrative Templates (.admx) for Windows 11 2026 Update (26H2) (version 1.0)
Category: System › Power Management › Video and Display Settings

Registry

ACSettingIndex

REG_DWORDComputer

HKLM\Software\Policies\Microsoft\Power\PowerSettings\3C0BC021-C8A8-4E07-A973-6B14CBCB2B7E Current key

Enabled value: Depends on the option value
Element: Turn Off the Display (seconds):
Value type: REG_DWORD
Maximum value: 4294967295

Apply with .reg · CMD · PowerShell

.reg

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Power\PowerSettings\3C0BC021-C8A8-4E07-A973-6B14CBCB2B7E]

; Value names and types follow the ADMX. Replace <enter value> below with your own data
"ACSettingIndex"=dword:<enter value>

CMD

:: Value names and types follow the ADMX. Replace <enter value> below with your own data

reg add "HKLM\Software\Policies\Microsoft\Power\PowerSettings\3C0BC021-C8A8-4E07-A973-6B14CBCB2B7E" /v "ACSettingIndex" /t REG_DWORD /d "<enter value>" /f

PowerShell

# Value names and types follow the ADMX. Replace <enter value> below with your own data

New-Item -Path 'HKLM:\Software\Policies\Microsoft\Power\PowerSettings\3C0BC021-C8A8-4E07-A973-6B14CBCB2B7E' -Force | Out-Null
New-ItemProperty -Path 'HKLM:\Software\Policies\Microsoft\Power\PowerSettings\3C0BC021-C8A8-4E07-A973-6B14CBCB2B7E' -Name 'ACSettingIndex' -PropertyType DWord -Value '<enter value>' -Force | Out-Null