What Is Low Power Mode on macOS?
Low Power Mode is a battery‑saving feature Apple introduced on MacBooks with macOS Monterey (12.0) and later. When enabled, your Mac reduces background activity and lowers system performance. The goal is to stretch battery runtime when you cannot charge.
This macos low power mode explained guide will help you understand exactly what changes, when to use it, and how much battery it saves. Unlike iOS, where Low Power Mode is a simple toggle, macOS offers more granular control.
If your macbook pro battery draining fast after update, enabling Low Power Mode can provide immediate relief while you diagnose the underlying cause. However, for permanent fixes, see our pillar post. For other battery settings, see our macOS battery settings guide (cluster post #10).
Which Macs Support Low Power Mode?
Low Power Mode is available on most MacBooks but not on all desktops. Here is the compatibility breakdown:
| Mac Model | Support for Low Power Mode |
|---|---|
| MacBook Air (2018 and later) | Yes |
| MacBook Pro (2016 and later) | Yes |
| MacBook (2015‑2017) | Yes (macOS Monterey or newer) |
| iMac (any model) | No – not applicable |
| Mac mini (any model) | No – not applicable |
| Mac Pro (any model) | No – not applicable |
| Mac Studio (any model) | No – not applicable |
Why not on desktops? Desktop Macs are always plugged in. Low Power Mode is designed for battery‑powered laptops. However, on Apple Silicon MacBooks, Low Power Mode is especially effective. For Intel MacBooks, the feature still works but with less dramatic power savings.
For Apple Silicon‑specific power management, see our MacBook charge limit guide (cluster post #1). For Intel Mac power tweaks, see our Intel Mac SMC reset guide for battery issues.
What Low Power Mode Actually Does
When you enable Low Power Mode, macOS makes several changes automatically. Here is a detailed list:
1. Reduces CPU clock speed
Your processor runs slower, which reduces power draw. On Apple Silicon Macs, the efficiency cores are prioritized over performance cores. On Intel Macs, Turbo Boost is limited or disabled.
2. Lowers GPU performance
Graphics‑intensive tasks (gaming, video editing, 3D rendering) will see lower frame rates. This saves significant power.
3. Dims the display slightly
The screen brightness is reduced by a small amount (about 10‑15%). You can still increase it manually, but that will reduce savings.
4. Pauses background mail fetch
Mail no longer checks for new messages automatically. You must open Mail to receive new emails.
5. Reduces iCloud sync frequency
Photos, Drive, and other iCloud services sync less often. This reduces network activity and CPU usage.
6. Disables “Hey Siri” listening
Voice activation is turned off. You can still activate Siri manually.
7. Lowers keyboard backlight brightness
The keyboard backlight dims or turns off more aggressively.
8. Reduces visual effects
Transparency and motion effects are reduced. This is similar to the Accessibility settings.
On Apple Silicon Macs, Low Power Mode also reduces the maximum wattage drawn by the CPU. On Intel Macs, it primarily affects Turbo Boost and fan curves.
For a complete list of power‑saving settings, see our macOS battery settings guide (cluster post #10).
How to Enable Low Power Mode on Your Mac
You have two ways to enable Low Power Mode: a quick toggle from the menu bar or a permanent setting in System Settings.
Method 1: Quick toggle (best for temporary use)
- Click the Battery icon in the menu bar.
- Select Low Power Mode.
The mode activates immediately. You will see a small battery icon change or a notification.
Method 2: Permanent setting (best for automatic activation)
- Go to System Settings > Battery.
- Next to Low Power Mode, click the dropdown menu.
- Choose Only on battery, Always, or Never.
- Only on battery – Low Power Mode turns on automatically when you unplug.
- Always – Stays on even when plugged in (rarely needed).
- Never – Low Power Mode never activates (default).
For most users, Only on battery is the best choice. For a deeper look at battery settings, see our macOS battery settings guide (cluster post #10).
When You Should Use Low Power Mode
Low Power Mode is not for everyday use. It reduces performance, so you should only enable it when you genuinely need to extend battery life. Here are the ideal scenarios:
- Long flights or train rides – When you cannot charge for 4+ hours.
- All‑day meetings or conferences – When outlets are scarce.
- Working in a coffee shop – When you forgot your charger.
- Power outages – When you need your Mac to last as long as possible.
- When your battery is low (below 20%) – To stretch the remaining charge.
Pro tip: Combine Low Power Mode with reduced screen brightness and closed unused apps for maximum runtime. See our MacBook battery health tips (cluster post #7).
When You Should Avoid Low Power Mode
Low Power Mode limits performance. Therefore, you should disable it for certain tasks:
- Video editing (Final Cut Pro, DaVinci Resolve, Premiere Pro)
- Gaming (any 3D game)
- Photo editing (Lightroom, Photoshop with large files)
- Software compilation (Xcode, compiling code)
- 3D rendering (Blender, CAD software)
- Virtual machines (Parallels, VMware)
In these scenarios, Low Power Mode will cause noticeable lag and reduced productivity. Plug in your MacBook or disable the mode temporarily.
For Intel Mac users, Low Power Mode can also cause fan curves to change, potentially leading to higher temperatures under sustained loads. Monitor your Mac’s temperature if you experience slowdowns.
For more on performance optimization, see our Mac performance optimization guide (placeholder).
How Much Battery Does Low Power Mode Save?
The exact savings depend on your Mac model and what you are doing. However, here are approximate real‑world results:
| Activity | Battery Savings with Low Power Mode |
|---|---|
| Web browsing (Safari) | 10‑15% longer runtime |
| Video streaming (Apple TV, YouTube) | 5‑10% longer runtime |
| Document editing (Word, Pages) | 15‑20% longer runtime |
| Light coding (VS Code) | 10‑15% longer runtime |
| Video calls (Zoom, Teams) | 5‑8% longer runtime |
| Idle / sleep | 20‑25% longer standby time |
Example: If your MacBook normally lasts 10 hours on a charge, Low Power Mode might extend it to 11‑11.5 hours. This is not a miracle, but it can mean finishing a flight instead of running out of battery.
For Apple Silicon Macs, the savings are slightly higher because the chips are already efficient. For Intel Macs, the savings are more noticeable during idle and light tasks.
For real‑time battery monitoring, see our MacBook battery terminal commands (cluster post #18).
Low Power Mode vs. Other Battery Settings
Low Power Mode is one of several battery‑saving tools. Here is how it compares:
| Setting | What It Does | Best Used When |
|---|---|---|
| Low Power Mode | Reduces CPU/GPU performance, pauses background tasks | Need to extend runtime significantly |
| Dim display | Lowers screen brightness | Any time, immediate effect |
| Disable Power Nap | Prevents background activity during sleep | MacBook is often unplugged in sleep |
| Manual charge limit | Caps battery at 80% (Apple Silicon only) | MacBook stays plugged in most of the time |
| Close unused apps | Frees CPU and memory | Always |
Low Power Mode is the most aggressive single setting. However, combining it with a dimmed display and closed apps yields the best results.
For a complete comparison of battery settings, see our macOS battery settings guide (cluster post #10) and MacBook battery health tips (cluster post #7).
Frequently Asked Questions
Q: Does Low Power Mode affect battery health?
No. It only affects runtime, not long‑term battery aging. In fact, running at lower power and temperature may slightly reduce aging.
Q: Can I use Low Power Mode while charging?
Yes, but there is no benefit. The MacBook runs on AC power, so battery savings are irrelevant. Disable it to restore full performance.
Q: Why is Low Power Mode grayed out on my Mac?
Your Mac may be a desktop (iMac, Mac mini) or an older MacBook that does not support the feature. Check compatibility above.
Q: Does Low Power Mode turn off automatically when I plug in?
If you set it to Only on battery, yes. If you used the quick toggle from the menu bar, it stays on until you turn it off manually.
Q: Will Low Power Mode make my MacBook Pro slow?
For everyday tasks (browsing, email, office work), the difference is minor. For heavy tasks (gaming, video editing), you will notice significant slowdowns.
Q: Can I schedule Low Power Mode to turn on automatically at a certain battery percentage?
Not with built‑in settings. However, you can use the pmset command (see our macOS pmset commands guide) to create a script that enables it below a threshold (advanced).
Q: Does Low Power Mode work on Boot Camp (Windows)?
No. It is a macOS‑only feature.