The practice of System and Network administration is a great resource for the "other" things that make a data center successful.

http://www.amazon.com/gp/product/0321492668?ie=UTF8&tag=wwwcolinmcnam-20&linkCode=as2&camp=1789&creative=9325&creativeASIN=0321492668

Another great resource that you should reference is your local power company. PG&E for example will consult with you, and sometimes pay for upgrades to lower your power consumption.

Here is an article that talks about that in general -

http://www.colinmcnamara.com/2008/02/22/moving-towards-a-green-data-center-truth-behind-the-hype

If this is helpful please rate it

--Colin