Superchargers allow Tesla owners to charge their cars quickly and for free, for life. The network is a big part of Tesla's efforts to convince drivers that range anxiety — the fear of running out of power on the road — shouldn't stop them from going electric.

There are currently 71 stations in North America and 14 in Europe. Tesla says that covers about 80% of the U.S. population.

Musk also confirmed he will set off on the cross-country trip he first announced in May, accompanied by his five young sons: