You can and _must_ if you want competitive costs. Musk famously overpaid in order to get speed of deployment.

I was reading geohot's musings about building a data center and doing so cost effectively and solar is _the_ way to get low energy costs. The problem is off-peak energy, but even with that... you might come off ahead.

And that dude is anything but a green fanatic. But he's a pragmatist.