McGrath,

Probably not much for the computers themselves, but I was thinking of the supporting systems. Multiprocessor servers, monitors, modems and related switches, bridges and routers generate a lot heat. A really big operation would use a lot of power to maintain ambient temperature and air. And unlike a lot of commercial buildings, it would be a 24/7 operation.

Plus there's technological obsolescence and what to do with all the computers and monitors. No one's recycling much so all those old XT's and black and white monitors end up in landfills. I think I saw the figure of six pounds of lead leachate for some older monitors. Plus mercury and all those other heavy metals. I know I'm on my fourth generation of computer. Earlier ones were recycled down to friends and soon ended up in the landfill.

On top of that, most would have fairly extensive UPS systems that could carry the computer and AC load in case of power problems. Which means not just generators but banks of batteries that have to be kept charged.

Regards

John