The Panasonic World Solar Challenge is currently crossing Australia . The average speed has shot up to 103 kph ( 64 mph ) -- in the 2005 race the winning car achieved a top speed of 147 kph ( 91 mph ) -- while the competition has expanded to incorporate several different classes of vehicle : the Challenge and Adventure Classes for exclusively solar cars , and the Greenfleet Technology Class for other types of environmentally friendly , low-emission vehicles . Race involves cars powered exclusively by solar energy . 47 teams from 18 countries cover 3000 kms in 8 days . Comment:
The Panasonic World Solar Challenge is currently crossing Australia . Race involves cars powered exclusively by solar energy . 47 teams from 18 countries cover 3000 kms in 8 days . Comment: