Renewables are “here now” only if you’re talking about using them for, say, 20% of the nation’s power, with fossil fuels or nuclear handling the rest. (Well, hydroelectric can handle baseload too, but we can’t build that many more dams.)
To make wind and solar handle everything, you need affordable grid-scale storage, and that is definitely not here now.
Here’s an article that highlights just how big of a problem that is:
http://physics.ucsd.edu/do-the-math/2011/08/nation-sized-battery/
The assumptions there are probably overly pessimistic, but even so, the sheer scale of the problem boggles the mind.
