Comment: Re:Didn't Apple just announce this? (Score 5, Insightful) 85
No, they didn't.
Roughly speaking, there are three levels of "greenness", for lack of a better word. "Off the grid" means you're totally self-sufficient; probably solar during the day stored to batteries for night, combined with ultra-efficient stuff. "Net zero" means you self-generate a surplus of power sometimes and a deficit others, selling your excess to the power company and buying your need. Being "fully renewable", like what Apple announced, "just" means you're buying all renewable energy. If you read the article you linked to, you'd see that Apple will only be generating 60% of its need, which means it's far from net zero.
I'm not actually sure how much the last means in practice, considering that it's not like they have dividers that say "this electron came from solar so it goes to Apple, while this electron came from coal so it can't." So really what it turns into is Apple giving the power company more money so that hopefully they'll build more renewable sources. Not to say that I don't applaud the decision, and even 60% generation is impressive, but it is indirect.