(Gilpin, 2014) According to Tesla, the efficiency of electric cars is three times that of the traditional gasoline engine, because most of the energy is lost during the heating process. Gilpin, 2014) There are two types of electric vehicles in production today, BEVs and PHEVs. BEV or Battery electric vehicles operate solely with energy stored in a battery which is recharged at stations. These cars have a range of over 60 miles and take around 6-8 hours to charge at a station. (Gilpin, 2014) Those who have to travel more than 60 miles per day might face problems with this. Those who might need to travel much further in a day would do well to choose the PHEV or plug-in hybrid electric vehicle. These vehicles run on both electricity and gasoline. They can run on electricity alone for up to 40 miles until they switch to gasoline acting as a hybrid. This means that after switching to hybrid mode, they will use both electricity and gasoline until they are recharged again. (Gilpin, 2014) In hybrid mode, PHEVs can travel more than 400 miles before requiring a recharge. (Gilpin, 2014) The relevance of electric cars is increasing. Particularly in large cities facing air quality problems, the demand for low-emission transport will be enormous.