Online LowTech Magazine has a privately-owned dedicated web server to run their sustainable magazine, powered by a 50 Watt solar panel and 0.17 kWh battery.
During the period under study (351 days), the solar powered website received 865,000 unique visitors. Including all energy losses in the solar set-up, electricity use is then 0.021 watt-hour per unique visitor. One kWh solar electricity can serve almost 50,000 unique visitors. This is all renewable energy and as such there are no direct associated carbon emissions.
If there is not enough sunshine, the site is offline. Yet the site was available for 98.2% of the time, with a downtime of only 152 hours over almost a year.
[lowtechmagazine.com] – How Sustainable is a Solar Powered Website?