How is Blackle saving energy?

Blackle saves energy because the screen is predominantly black. "Image displayed is primarily a function of the user's color settings and desktop graphics, as well as the color and size of open application windows; a given monitor requires more power to display a white (or light) screen than a black (or dark) screen." (Roberson et al, 2002)

In January 2007 a blog post titled Black Google Would Save 750 Megawatt-hours a Year proposed the theory that a black version of the Google search engine would save a fair bit of energy due to the popularity of the search engine.

In 2024 the majority of monitor sales are LED backlit LCD's which do not light up the parts of the screen that are black. Some older CCFL LCD monitors worked by wastefully backlighting the entire screen. Since 2005 manufacturers have moved away from CCFL's.

We believe that there is value in the concept because even if the energy savings are small, they all add up. Secondly we feel that seeing Blackle every time we load our web browser reminds us that we need to keep taking small steps to save energy.

Blackle was created by Heap Media and is powered by Google Custom Search.

How can you help?

We encourage you to Set Blackle as your homepage. This way every time you load your Web browser you will save a little bit of energy. Remember every bit counts! You will also be reminded about the need to save energy each time you see the Blackle page load.

Help us spread the word about Blackle by telling your friends and family to set it as their home page. Put the following text in your email signature: "Blackle.com - Saving energy one search at a time".

There are a lot of great web sites about saving energy and being more environmentally friendly. They are full of great tips covering the little things that we can all do to make a difference today. Try Blackling "energy saving tips".

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