Last year was the first time someone could use the words “solar” and “mainstream” in the same sentence and be taken seriously. It’s still too early to call solar PV a truly mainstream energy technology, but as GTM Research VP Shayle Kann recently pointed out, it’s getting close. And there a lot of factors to consider other than how it stacks up in today’s generation mix compared to legacy resources. We’ve compiled a list of some of the best solar statistics of 2013 that demonstrate how far the technology has come — as well as how far it still needs to go.