You've seen the numbers before. We've said that we have about 300 data centres. That breaks down into 20 large ones, with 65 in the middle, and a balance of smaller ones. In aggregate, that adds up to about 600,000 square feet of data centre floor space.
I've had an opportunity to actually visit 18 of the original 20 big ones. By and large, all of those data centres were built in the late seventies and the early eighties, using standards that existed at that time. Two things have happened through data centre evolution. The first thing is power efficiency and cooling efficiency, because those two things come in tandem in a data centre. When you power something, it creates heat, and you have to turn around and cool it, so you get that double effect.
New data centres are much more efficient. They're built to much higher standards, so there's a bonus in that you use less power. They're enormous power hogs.
The second thing, because technology is a lot more compact, is that you can use much less floor space. We estimate that instead of using 600,000 square feet, by the time we've finished all of the work we'll get to somewhere around 200,000 square feet, so there is a 3:1 space advantage just by taking advantage of advances in technology and that sort of thing.
All of that adds up. By the time you have increased efficiency and less floor space, you're going to end up with an environmental bonus at the end.