Cumulative sales of plug-in vehicles in the US topped 500,000 units in September, according to figures gathered by the US Department of Energy (DOE). The introduction of the first mass market plug-in vehicles occurred in December of 2010 with the introduction of the Chevrolet Volt and Nissan Leaf. By the end of 2012 there were 11 different plug-in models available, and by September of 2016 there were 27 different models. Electric vehicle sales have been accelerating in 2016. For the past three years, sales of plug-in vehicles have averaged a little over 10,000 units per month. However, monthly sales records have been set five times since December 2015, and reached an all-time high of 16,069 units in September of 2016. Top. Monthly and cumulative PEV sales in the US. Data: DOE. Bottom: Starting MSRP, electric range and full range of select PEVS currently on the market. Click to enlarge. […]