Just listened to a TechNet Radio interview with David Ohara titled…
Building a Green Data Center
That led me to find his blog… Green Data Center Blog and an article in TechNet… Build a Green Data Center.

From Information Week…
Computer Servers In U.S., Europe and Japan Are Power Hogs
In total, electricity to power computer servers and related infrastructure worldwide reached 123 billion kWh in 2005, which is equivalent to fourteen 1,000-megawatt power plants, or 14 typical nuclear or coal-burning plants, says Koomey.