White and bright colors (especially in backgrounds) can use up to 20% more power than black or dark colors.
Black Google Would Save 750 Megawatt-hours a Year
an all white web page uses about 74 watts to display, while an all black page uses only 59 watts. Google gets about 200 million queries a day. That means Google is running for about 550,000 hours every day on some desktop. The shift to a black background will save a total of 15 (74-59) watts. That turns into a global savings of 3000 Megawatt-hours a year. At 10 cents a kilowatt-hour, that’s $75,000.
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