Gimundo.com (delivering good news daily) reported that an all-black Google home page saves 750 megawatt-hours of electricity a year. An all-white web page requires about 74 watts to display, whereas a black page requires only 59 watts.
750 megawatt-hours can power for an entire year:
77 North American homes
150 European homes
268 African homes
536 Asian or South American homes
3,750 homes in Afghanistan
An Australian company called Heap Media have created a Google-powered site called blackle.com. The site keeps a running total of the number of watts saved to date. At press time, that number was nearly 135 million watt-hours.
I’ve made Blackle my home page.