The U.S. electricity sector is undergoing a steady shift in favor of clean energy. But transportation isn't seeing the same level of change. In this week's podcast, recorded live at the Department of Transportation, we'll look at where the tipping points may occur in electric vehicles, car-sharing, public transport and freight.

This week's podcast was recorded live at the Department of Transportation. Joining us are Greg Winfree, assistant secretary of research and technology at DOT, and Austin Brown, a senior analyst at the National Renewable Energy Laboratory.

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The Energy Gang is produced by Greentechmedia.com. The show features weekly discussion between energy futurist Jigar Shah, energy policy expert Katherine Hamilton and Greentech Media Editor Stephen Lacey.