this post was submitted on 01 Oct 2023
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According to a Purdue University Study dark mode can save 3 to 9% of your battery if you're on auto brightness. Let's say your average phone uses 15Wh per day (5.475 kWh per year). Let's say 5 billion people use smartphones. That's around 30 TWh for total yearly smartphone consumption.
So if everyone was using dark mode, it could save around 0.8 to 2.5 TWh a year in the best case scenario. But that is if everything on your phone was dark mode. Not sure how much time people spend browsing websites percentually.
That's around 0.1 to 2.7 times the daily electric energy production of all nuclear power plants.
The world electricity production is around 23000 TWh per year, so you could save around 0.0036% to 0.01% of yearly energy consumption by switching everyone to dark mode.
Such impactful, much environment, wow
I’m pretty sure those savings would apply only on pitch black interfaces on OLED screens, IPS panels do not use less energy by displaying black, unless is the only color on screen.
If a UI is dark grey (like the Nestle one in this post screenshot), all of the diodes on an OLED screen are lit up, so there shouldn’t be any savings whatsoever.
Also, we’re far from having dominance of OLED screens in the smartphone market, which would be required for your scenario to apply.