Black Google Would Save 3,000 Megawatts a Year
As noted, an all white web page uses about 74 watts to display, while an all black page uses only 59 watts. Let us do a little math and see what could be saved by moving a high volume site to the black format.
Take at look at Google, who gets about 200 million queries a day. Let’s assume each query is displayed for about 10 seconds; that means Google is running for about 550,000 hours every day on some desktop. Assuming that users run Google in full screen mode, the shift to a black background will save a total of 15 (74-59) watts. That turns into a global savings of 8.3 Megawatt-hours per day, or about 3000 Megawatt-hours a year. And at 10 cents a kilowatt-hour, that’s $300,000, a goodly amount of energy and dollars for changing a few color codes.
Black is only more efficient for CRT monitors, it makes no difference on LCDs.
The link to the wattage for different colors is from EnergyStar.
Originally by – http://ecoiron.blogspot.com