Black Google

Black webpages use 59 watts of power, 15 watts less than white webpages.
With 200 million queries a day, that's 8.3 Megawatt-hours per day, or 3 gigawatts per year.
And that's disregarding all of those who use Google as their startpage and
therefore open it without searching every time they open their browser.

All of this means that a black Google would save over $300,000 per year.

Advertising Programs - About Google