I enjoyed the discussion on energy consumption and laptops very much.
A friend in Leiden (1/2 hr outside amsterdam) runs an organisation
called cleanbits (www.cleanbits.nl
). Their aim is to encourage ISPs to
be green. I always thought it was a great idea but I didn't fully
appreciate how good it was until he posted me some calculations he has
done. To paraphrase Rene :
Cleanbits estimates that (based on info provided by Xs4all and IS.nl),
that the average (2U) server uses around 1700 KWh per year.
The reason it is so high is because about 90% of the total energy is
used by the enviroment that hosts the server. This includes lights,
security, cooling, ups charging etc etc
That equates to about 1 ton of CO2 per year.
Rene did some calculations on the consumption of wikipedia which hosts
approx 350 servers. Cleanbits estimation was this :
* Wikipedia uses approx 600.000 Kwh per year
* equates to 350 tons CO2 per year
* comparable with the yearly CO2 consumption of 17500 trees
* comparable with the pollution caused by an average car that drives 2
million km's per year
'free as in media'