Clean energy? We'll drink to that. Join us on the rooftop of One American Center for happy hour with CleanTX, Austin's clean technology cluster group, and E.ON Climate and Renewables, one of the world's leading renewable energy developers.

Before the event, check out the SXSW Eco Startup Speed Pitches featuring presentations from 15 top social impact and cleantech companies:

http://schedule.sxsw.com/2014/events/event_IAP994369