How to check the supported power states on Windows 11

Windows 11 can handle different power states specified in the Advanced Configuration and Power Interface (ACPI) Specifications.

Most people are generally aware of commonly used energy states such as on, off, sleep and hibernation. However, your computer can handle power in several ways. Knowing these power states can help you better understand how your PC works with power and may give you some helpful ways to use your computer.

However, not all power states are available on all computers. You need to check the power states available on your computer based on your hardware, and we’ll show you how below.

How to check your available power states in Windows 11

You can find the available power states on your computer using the command prompt.

  1. Press the Start menu, type cmdmove your cursor over the Command Promptand select Run as administrator.
  2. Type the following command and press Enter:
    powercfg /availablesleepstates

You will see two lists of power statuses. One is a list of supported power states and the other is a list of unsupported power states.

All Windows 11 power states

You probably don’t know what all those power states mean and how they differ from each other. However, they are quite easy to understand. Here is the list of power states you will see:

S0: Working State

S0 stands for the working state. This is the state of your computer when you can use it.

S0 Low Power Idle: Sleep Mode (Modern Standby)

Modern Standby is an upgrade of the older S3 power model. It allows you to power on devices much faster than S3, allowing for a seamless experience when using a modern device. It is widely supported on System on Chip (SoC) devices. However, it is still possible that a modern device does not support modern standby. If your computer supports S0 low-power idle mode, it does not support S1, S2, or S3 mode.

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S1, S2, S3: Sleep power status

The “sleep state” is where one or more components of the computer are turned off or switched to power-saving mode.

The S1 sleep mode stops the CPU, the rest of the components shut down or continue to run in power-saving mode, and the RAM retains power.

S2 sleep mode cuts off power to the CPU, other components shut down or continue in power-saving mode, and RAM retains power.

S3 is a standby state where the CPU has no power, but RAM retains power and refreshes slowly. Other hardware components such as the hard drive and fan are stopped.

Your device may also support a “Hybrid Sleep” mode where you can save the session. If the power to the computer goes out in sleep mode, you can pick up where you left off.

S4: Sleep Mode

Hibernate is different from hibernate because hibernate saves RAM contents and operating system context to a hard drive and turns off all connected devices. When you turn the computer back on, you can immediately start working from where you left off before hibernation.

Windows 11 also has a Fast Startup mode, a lightweight version of hibernation. Instead of saving everything as it is (such as logged in users and open files and applications), it saves only the bare minimum of services needed to boot the system. As a result, it helps systems start up faster. However, there are several arguments for disabling fast startup.

S5: Soft Off Power Status

S5 is the soft off state. Only components like the power button have trickle power. No other component is actively drawing power in this state, and the computer is not performing any computational tasks.

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G3: Mechanical off

The mechanical off state is also a state where the computer is completely turned off, as in S5. However, the power is completely removed via a mechanical switch. No hardware components, including the power button, have a power supply. This status is usually only necessary for disassembling a computer. Note that the real-time clock can still run with its small battery.

Energy modes, explained

Knowing the power modes can help you understand what happens when you put your computer into a certain power state and how power-intensive that state can be. Did you know that Windows also has an Ultimate Performance Power subscription? It’s not always recommended to turn it on, but if you’re not too concerned about power consumption, consider turning it on.

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