Mark Z. Jacobson, professor of Civil and Environmental Engineering at Stanford gave a talk at the New School in 2012 about the economics of renewable energy.
His part of the talk starts at 18:50.
See also: his TED debate with Stewart Brand about nuclear energy.
I feel slightly bad linking to this since I know a couple of the speakers on the list. But I still chuckled a bit as I was reading it. Now I see some chatter about a TED parody event.