C# Signature:

    [DllImport(@"User32", SetLastError=true, EntryPoint = "RegisterPowerSettingNotification",
         CallingConvention = CallingConvention.StdCall)]
    private static extern IntPtr RegisterPowerSettingNotification(
        IntPtr hRecipient,
        ref Guid PowerSettingGuid,
        Int32 Flags);

VB Signature:

Declare Function RegisterPowerSettingNotification Lib "user32.dll" (TODO) As TODO

User-Defined Types:

       private const int WM_POWERBROADCAST = 0x0218;

    static Guid GUID_BATTERY_PERCENTAGE_REMAINING = new Guid("A7AD8041-B45A-4CAE-87A3-EECBB468A9E1");
    static Guid GUID_MONITOR_POWER_ON = new Guid(0x02731015, 0x4510, 0x4526, 0x99, 0xE6, 0xE5, 0xA1, 0x7E, 0xBD, 0x1A, 0xEA);
    static Guid GUID_ACDC_POWER_SOURCE = new Guid(0x5D3E9A59, 0xE9D5, 0x4B00, 0xA6, 0xBD, 0xFF, 0x34, 0xFF, 0x51, 0x65, 0x48);
    static Guid GUID_POWERSCHEME_PERSONALITY = new Guid(0x245D8541, 0x3943, 0x4422, 0xB0, 0x25, 0x13, 0xA7, 0x84, 0xF6, 0x79, 0xB7);
    static Guid GUID_MAX_POWER_SAVINGS = new Guid(0xA1841308, 0x3541, 0x4FAB, 0xBC, 0x81, 0xF7, 0x15, 0x56, 0xF2, 0x0B, 0x4A);
    // No Power Savings - Almost no power savings measures are used.
    static Guid GUID_MIN_POWER_SAVINGS = new Guid(0x8C5E7FDA, 0xE8BF, 0x4A96, 0x9A, 0x85, 0xA6, 0xE2, 0x3A, 0x8C, 0x63, 0x5C);
    // Typical Power Savings - Fairly aggressive power savings measures are used.
    static Guid GUID_TYPICAL_POWER_SAVINGS = new Guid(0x381B4222, 0xF694, 0x41F0, 0x96, 0x85, 0xFF, 0x5B, 0xB2, 0x60, 0xDF, 0x2E);

    // Win32 decls and defs
    //
    const int PBT_APMQUERYSUSPEND = 0x0000;
    const int PBT_APMQUERYSTANDBY = 0x0001;
    const int PBT_APMQUERYSUSPENDFAILED = 0x0002;
    const int PBT_APMQUERYSTANDBYFAILED = 0x0003;
    const int PBT_APMSUSPEND = 0x0004;
    const int PBT_APMSTANDBY = 0x0005;
    const int PBT_APMRESUMECRITICAL = 0x0006;
    const int PBT_APMRESUMESUSPEND = 0x0007;
    const int PBT_APMRESUMESTANDBY = 0x0008;
    const int PBT_APMBATTERYLOW = 0x0009;
    const int PBT_APMPOWERSTATUSCHANGE = 0x000A; // power status
    const int PBT_APMOEMEVENT = 0x000B;
    const int PBT_APMRESUMEAUTOMATIC = 0x0012;
    const int PBT_POWERSETTINGCHANGE = 0x8013; // DPPE

    const int DEVICE_NOTIFY_WINDOW_HANDLE = 0x00000000;
    const int DEVICE_NOTIFY_SERVICE_HANDLE = 0x00000001;

    // This structure is sent when the PBT_POWERSETTINGSCHANGE message is sent.
    // It describes the power setting that has changed and contains data about the change
    [StructLayout(LayoutKind.Sequential, Pack = 4)]
    internal struct POWERBROADCAST_SETTING
    {
        public Guid PowerSetting;
        public Int32 DataLength;
    }

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Notes:

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Sample Code:

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