The Big Picture: Eco Mode or Sport Mode
A car can have "eco" and "sport" driving modes. Same engine, different rules: eco saves fuel and sport answers the pedal sharply. A Windows power plan is the same idea. It is a named bundle of settings that tells the Power Manager (Section 1) how to trade speed against energy.
7.1 Balanced, Power Saver, High Performance
What it is: A power plan (or power scheme) is a saved set of power settings. Windows ships with a few, and the PC maker may add its own.
| Plan | Idea | Typical effect |
|---|---|---|
| Balanced | The default. Speeds up when needed and saves power when idle | Good for most people |
| Power saver | Saves as much energy as it can | Slower CPU, dimmer screen, shorter timeouts |
| High performance | Favours speed over energy | CPU stays ready, higher power use and heat |
| Ultimate Performance | On some editions (for example, Windows 10/11 Pro for Workstations, and sometimes shown on other editions) | Removes small power-saving delays for the lowest latency |
Hedge: Which plans you see depends on the Windows version, whether the PC uses Modern Standby, and the PC maker. Some modern laptops show only Balanced in Control Panel, and offer the power mode slider instead (see 7.4).
Where to look:
| Place | Path |
|---|---|
| Control Panel | Control Panel → Hardware and Sound → Power Options (Chapter 15) |
| Settings | Settings → System → Power & battery (Chapter 16; on Windows 10, Power & sleep) |
Both are ways to view and set the same underlying plans.
7.2 Custom Plan Settings
What it is: Each plan holds many settings. Some are simple (shown in Settings); many more are in the Advanced window: Power Options → "Change plan settings" → "Change advanced power settings".
Most settings have two values: one for On battery and one for Plugged in.
| Setting | What it controls |
|---|---|
| Turn off the display after | When the screen turns off |
| Put the computer to sleep after | When the PC goes to sleep |
| Hibernate after | Sleep, then hibernate later (Section 4.6) |
| Processor power management → Minimum processor state | The lowest speed the CPU may drop to, as a percentage |
| Processor power management → Maximum processor state | The highest speed it may use. 100% allows full speed and turbo |
| Processor power management → System cooling policy | Fan first, or slow the CPU first |
| PCI Express → Link State Power Management | How aggressively the PCIe links nap (Section 8) |
| USB settings → USB selective suspend | Allow idle USB ports to sleep (Section 8) |
| Hard disk → Turn off hard disk after | When a spinning hard drive stops (Section 8) |
| Display → Display brightness / Dimmed brightness | Screen brightness |
| Battery → Critical battery action / levels | What to do at very low battery |
| Power buttons and lid | What closing the lid or pressing the button does |
| Sleep → Allow hybrid sleep / Allow wake timers | Section 4.5 and Section 10 |
You do not need to change any of these. In the lab you only look.
7.3 Reading Plans With powercfg (Read-Only)
powercfg has read-only switches for plans:
| Command | What it shows |
|---|---|
powercfg /list | All power plans, each with a GUID (a long unique ID); the active one has a star * |
powercfg /getactivescheme | Only the active plan and its GUID |
powercfg /query | Every setting of the active plan (a very long list) |
powercfg /query SCHEME_CURRENT SUB_SLEEP | Only the Sleep group's settings (hedge: the group alias; the plain /query always works) |
powercfg /list
Power Scheme GUID: 381b4222-f694-41f0-9685-ff5bb260df2e (Balanced) *
Power Scheme GUID: 8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c (High performance)
Power Scheme GUID: a1841308-3541-4fab-bc81-f71556f20b4a (Power saver)
(That is an example. Your PC may list fewer plans and different GUIDs for custom plans.)
Things you can read in /query:
- Setting GUID and its name
- Possible values (minimum, maximum, increment)
- Current AC Power Setting Index (plugged in) and Current DC Power Setting Index (on battery); the values are numbers, such as seconds or percentages, shown in hexadecimal.
Changing plans is possible with commands such as powercfg /setactive, and it is reversible, but it is not part of the lab. If you ever change a plan, note the old GUID first so that you can switch back.
7.4 The Power Mode Slider (Windows 10 and 11)
What it is: On newer Windows versions, Settings → System → Power & battery has a Power mode choice (on Windows 10 it is a slider reached from the battery icon). It sits on top of the power plan and quickly shifts the balance.
| Mode | Meaning |
|---|---|
| Best power efficiency | Save battery; the CPU is held back |
| Balanced | The default |
| Best performance | Favour speed (uses more battery) |
Hedge: The exact names and which modes appear depend on the Windows version and PC (some desktops show only "Balanced" and "Best performance"; an extra "Gaming" style mode can be offered by the PC maker). The slider is easy to experiment with and fully reversible, but the lab does not require it.
7.5 Why Plans Matter
| Situation | Better choice |
|---|---|
| On battery, light work | Balanced or Best power efficiency |
| Heavy video editing, plugged in | Best performance |
| Fan noise is annoying | Power saver or a lower maximum processor state |
| PC feels laggy on a laptop that is stuck in Power saver | Switch to Balanced |
| Server or workstation needing steady speed | High or Ultimate Performance |
You can see the effect: open Task Manager → Performance → CPU (Chapter 11) and watch Speed. Under a power-saving plan, it stays lower; under a performance plan it rises faster and higher.
Summary
| Term | Plain meaning |
|---|---|
| Power plan | Named bundle of power settings |
| Balanced / Power saver / High performance | The standard plans |
| Ultimate Performance | Extra plan on some editions, with the fewest delays |
| Advanced settings | Hundreds of per-plan settings, with AC and battery values |
powercfg /list | Lists plans; * marks the active plan |
powercfg /getactivescheme | Shows the active plan |
powercfg /query | Dumps the active plan's settings (read-only) |
| Power mode slider | Quick performance/efficiency shift above the plan |