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It is said that websites with a black background are more sustainable from an electricity consumption perspective. Is there a tool to measure the most sustainable website design you can use while developing websites?

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    Your premise isn't entirely true, it depends on the used display. See also this question or this question
    – THelper
    Jan 30 '13 at 15:26
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    Are there better ways of designing a website to save electricity? Yes, and no. Some websites use a JQuery script to black the screen after inactivity, not because having the pixels black save on LCD power, (They don't, LCD uses same energy across any color) but because of an effort to reduce the load on the GPU that is maintaining the status of the background page. Jan 31 '13 at 6:11
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Nowadays, a black or white background of websites doesn't matter much as a lot of people trashed their CRT screens already. LCD displays don't vary that much in energy consumption of dark or light colours.

Anyway, to answer your question: No, or at least: difficult.

Why is that? Because today not the computer receiving the website is the huge power consumer but the computer which accepts and processes the requests of webbrowsers.

The best example is google. Current power consumption of Google server parks is estimated as high as one of a city with 500,000 inhabitants. A single search request consumes as much power as required to heat 200ml water.

In short: to measure website's power consumption you should consider the power used to generate the site rather than the power needed to display it.

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