Giant solar farms used to power equally giant server farms may be popular, but an Amazon engineer James Hamilton questions whether they're truly as good for the environment as they seem. The core issue is that these farms, even in the best of conditions, supply only a tiny fraction of the power used at a typical data center. As Wired points out, Facebook's Prineville, OR solar farm only powers the lights. As Hamilton points out, there are other non-obvious costs to solar farms from land usage to tax credits that shift costs to citizens. A better solution may be to focus more on reducing consumption at these data centers, but take a look at the math yourself at the links below to see if you agree.