Here are some ideas that may help having a lower energy consumption with Mac OS (OS X, macOS) when you want to save the energy of your MacBook's battery. See also: Mac OS Settings, Operating Systems, Software.
Security & Privacy
Privacy
Location Services
System Services
[ ] Location-Based Suggestions
[ ] Setting Time Zone
Analytics
[ ] Share Mac Analytics
[ ] Share with App Developers
[ ] Share iCloud Analytics
Spotlight
Privacy
Macintosh HD
Energy Saver
[x] Automatic graphics switching
[x] Put hard disks to sleep when possible
[ ] Wake for network access
Keyboard
Text
[ ] Correct spelling automatically
App Store
[ ] Automatically check for updates
Network
[Turn Wi-Fi Off] (of course, only turn off when not needed)
Bluetooth
[Turn Bluetooth Off]
Extensions
Share Menu
[ ] Notes
[ ] Reminders
[ ] Add to Reading List
[ ] Add to Aperture
[ ] Add to Photos
[ ] Flickr
[ ] Vimeo
[ ] Sina Weibo
[ ] Tencent Weibo
[ ] Youku
[ ] Tudou
Today
[ ] Calendar
[ ] Weather
[ ] Social
[ ] iTunes
[ ] World Clock
[ ] Find My Friends
[ ] Calculator
[ ] Stocks
Sharing
All off
Users & Groups
Login Items
[ ] iTunesHelper
[ ] AdobeResourceSynchronizer
Siri
[ ] Enable Siri
Date & Time
Time Zone
[ ] Set time zone automatically using current location
Accessibility
VoiceOver
[ ] Enable VoiceOver
Zoom
[ ] Use keyboard shortcuts to zoom
Display
[x] Use grayscale
Speech
[ ] Enable announcements
Keyboard
[ ] Enable Sticky Keys
[ ] Enable Slow Keys
Use the lowest possible setting where you still can see considering the environment you are at.
If it is difficult to see, try increasing the zoom factor or font size of the app you are using.
w3m for web browsing (instead of Google Chrome)
emacs for editing text files (instead of using LibreOffice for word processing)
Profiles
Basic 2 (new profile)
Text
Font
SF Mono, 16
Character Spacing: 1
Line Spacing: 1
Window
Window Size
Columns: 165 (depends on the display size)
Rows: 49 (depends on the display size)
Advanced
Text encoding: [Unicode (UTF-8)]
When an app is in full screen mode the operating system can determine to discontinue some background tasks.
You can put two or more apps to full screen view and then use three fingers to swipe left/right on your trackpad to switch between those full-screen apps.
See "System Preferences", "Trackpad", "More Gestures", "Swipe between full-screen apps".
QupZilla
Firefox
(When comparing web browsers, remember to start them approximately at the same time after starting your computer, use them for the same period of time and use them on the same web pages for more reliable "Avg Energy Impact" on "Activity Monitor".)
Preview
Last modified: August 27th, 2018
Author: Tomi Häsä (tomi.hasa@gmail.com)
URL: http://sites.google.com/site/tomihasa/mac-os-low-battery-usage