GigaOm's Katie Fehrenbacher has a detailed state of the green data center story in NC featuring Apple, Google, and Facebook.
The controversial world of clean power and data centers
The post is long, but a quick read. Here is the main point that highlights Apple vs. Google vs. Facebook.
Note that Greenpeace is planning an update tomorrow.
While questions still remain about how exactly Apple will meet its 100 percent clean power data centers goals (see Greenpeace report out tomorrow), Apple is clearly acting as a pioneer.