At the start of 2014, there were over 400,000 plug-in electric vehicles on roads worldwide.
That's according to an analysis by Zentrums für Sonnenenergie- und Wasserstoff-Forschung Baden-Württemberg (ZSW) in Germany.
As ZSW claims, this 400,000-unit figure represents a doubling from 2013 and a quadrupling from the start of 2012 when only 100,000 were on the roads.
Officially, ZSW pegs the number of plug-in electric vehicles on roads at 405,000 in the beginning of this year.
When will we crest 1 million? According to ZSW, that will happen in early 2016. The race to 1 million is on.
It's worth pointing out that none of the figures provided by ZSW included plug-in electric motorcycles, trucks or buses.
Plug-In Electric Vehicle Sales Chart - Automaker Breakdown
