Powershell - Displaying and changing the power mode in Windows

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Hello,

For some time now, I’ve been paying more attention to my energy consumption, and of course that includes the power consumption of my work PC. In normal use, I haven’t seen any big difference in power consumption between normal and performance mode (in normal use), but in energy-saving mode I’ve reduced it by more than 60w (roughly 140w instead of 200w).
I haven’t noticed any slowdown in the power consumption of my PC. I didn’t experience any annoying sluggishness in power-saving mode, but to be on the safe side I switch to performance mode when I’m making and encoding videos or 3D.
. But switching from economy to performance takes too much graphical action (and I’m lazy) whereas a small powershell function launches quickly.

# List power modes
Get-CimInstance -Name root\cimv2\power -Class Win32_PowerPlan | Select-Object -Property ElementName, instanceid, IsActive
# or
PowerCfg.exe -list

# List the power mode currently in use
Get-CimInstance -Name root\cimv2\power -Class Win32_PowerPlan -filter "IsActive = 'true'"
# or
PowerCfg.exe -getactivescheme

# Create a custom object
$PowerSchemes = Get-CimInstance -Name root\cimv2\power -Class Win32_PowerPlan
[System.Collections.ArrayList]$PowerPlan = @()
Foreach ( $Scheme in $PowerSchemes ) {
$PowerPlan += [pscustomobject]@{
Name = $Scheme.elementname
ID = $Scheme.InstanceID.Substring(21,36)
# Or
#ID $Scheme.InstanceID.split('\')[-1].trim('{}')
Active = $Scheme.IsActive
                                }}
$PowerPlan

# Change the power mode
Get-CimInstance -Name root\cimv2\power -Class Win32_PowerPlan |
    Where-Object ElementName -eq "Power saver" |
        Invoke-CimMethod -MethodName Activate
# or
$GUID = 'a1841308-3541-4fab-bc81-f71556f20b4a'
Powercfg.exe -SETACTIVE $GUID
# 381b4222-f694-41f0-9685-ff5bb260df2e Balanced
# 8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c High performance
# a1841308-3541-4fab-bc81-f71556f20b4a Power saver

This can be turned into two simple functions The first to display the power mode

function Get-PowerPlan {
Param (
        [switch]
        $Active,
        [switch]
        $List )

# List power modes
$PowerSchemes = Get-CimInstance -Name root\cimv2\power -Class Win32_PowerPlan

# Creation of a custom object
[System.Collections.ArrayList]$PowerPlan = @()
Foreach ( $Scheme in $PowerSchemes ) {
$PowerPlan += [pscustomobject]@{
Name = $Scheme.elementname
ID = $Scheme.InstanceID.Substring(21,36)
Active = $Scheme.IsActive
}}

# List the power mode currently in use
if ( $Active ) {
$PowerPlan.Where({$_.active -eq $true}).name }

# Change the power supply mode
if ( $List ) {
$PowerPlan }
 }
# Display the active power mode
Get-PowerPlan -Active

# List the power modes
Get-PowerPlan -List

And the second to change the power mode

function Set-PowerPlan {
Param (
        [GUID]
        $ID = 'a1841308-3541-4fab-bc81-f71556f20b4a',
        [string]
        $Name,
        [ValidateSet("Balanced", "Performance", "Saver")]
        $FriendlyName)

# List the power modes
$PowerSchemes = Get-CimInstance -Name root\cimv2\power -Class Win32_PowerPlan

# Change the power mode using the ID
if ( $Name ) {
$null = $PowerSchemes |
    Where-Object ElementName -eq $Name |
        Invoke-CimMethod -MethodName Activate }

if ( $ID ) {
$null = $PowerSchemes |
    Where-Object InstanceID -match $ID |
        Invoke-CimMethod -MethodName Activate }

if ( $FriendlyName ) {
switch ($FriendlyName) {
"Balanced" { $null = $PowerSchemes |
    Where-Object InstanceID -match '381b4222-f694-41f0-9685-ff5bb260df2e' |
        Invoke-CimMethod -MethodName Activate }
"performance" { $null = $PowerSchemes |
    Where-Object InstanceID -match '8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c' |
        Invoke-CimMethod -MethodName Activate }
"Saver" { $null = $PowerSchemes |
    Where-Object InstanceID -match 'a1841308-3541-4fab-bc81-f71556f20b4a' |
        Invoke-CimMethod -MethodName Activate }
    }
        }
        }
# Activate a plan via its id
Set-PowerPlan -id a1841308-3541-4fab-bc81-f71556f20b4a

# Activate a plan via its name
Set-PowerPlan -Name "High performance"

# Activate the default power-saving mode
Set-PowerPlan

# Use a friendlier name
Set-PowerPlan -FriendlyName Saver