As the United States begins to enter a warming period leading up to the onset of Spring. We take a look back on the Polar Vortex – the bouts of severe cold experienced by much of the country in early 2014. In this video interview, we discusses the impact of growing shale gas resources on the energy sector, the key role that coal-fired electric generation played during the Polar Vortex, and what this experience of severe cold tells us about future energy policy and prices.