Blackle by Candis July 10, 2007 Uncategorized 3 Did you know that an all white web page uses about 74 watts to display, while an all black page uses only 59 watts? I had no idea. Blackle is Google with a black background. Blackle saves energy because the screen is predominantly black. Read more about it here. If you use Blackle, every time you load your Internet browser you will save a little bit of energy.