San Antonio see "nexus" between dirty, old technology and new, green opportunity.

CPS Energy, owned by The City of San Antonio, announced earlier this week they will close their clunker 800+MW coal plant in 2018, invest heavily in local solar and natural gas electricity generation, invest heavily in attracting clean tech manufacturers, and build a 200MW "cleaner coal" plant.

Why? It's better economically. Their big plan will bring 800 to 1,000 green tech jobs to town by 2015. Mayor Julian Castro (pictured), "San Antonio understands the nexus between sustainability and job creation."

Castro's leadership has some folks in green tech saying, "San Antonio will be America's greenest city."

So, where does that leave Austin?