EPRI is an independent nonprofit organization that conducts research on electricity. The document discusses the growth of plug-in electric vehicles and infrastructure needs to support them. It summarizes EPRI research estimating Tennessee's plug-in electric vehicle population could reach between 10,000 and 20,000 by 2020, with the top ten counties being Davidson, Shelby, Knox, Hamilton, Williamson, Sullivan, Rutherford, Sumner, Blount, and Washington. Infrastructure such as charging stations will need to be installed to support the increasing number of electric vehicles.