Some of the best-paid athletes, who can afford any car, are shunning gas guzzlers and driving hybrids and electric vehicles with minimal or no tailpipe emissions.
The chief executive of the race series, in which purely electric open-wheel racecars would compete in city centers, faces a number of challenges.
Fast chargers for electric vehicles are already available, but their connectors are largely incompatible. As standards wars go, the debate over which will become the industry leader is a version of the battle between Betamax and VHS.