Formula E continues to shape up as a major single seater series of the future.
The latest driver to take the all-electric category seriously is Sergey Sirotkin, who will test in Morocco later this month.
Series of the future
"Formula E is now one of the most rapidly developing championships. The competition here is at very high level," the ousted Williams driver said.
READ: 'Nobody in Foruma 1 watches Formula E' - Jacques Villeneuve
Given the involvement by major manufacturers and top drivers, and the direction the car industry and society is heading, series boss Alejandro Agag thinks Formula E is the series of the future.
"We love Formula 1, we think it's great. But I think we will be the only motor sport left in 20, 30, 40 years," he is quoted by Speed Week.
Top Formula E driver Jean-Eric Vergne, who also raced in F1, thinks Formula E and F1 will eventually merge.
"In 2030 there will only be electric cars. F1e will have completely changed its attitude in terms of electric," he said.
"Today, Formula E is something completely different from F1, but I sometimes hear that one day the two series could merge, which I think would be great," Vergne added.
"But F1 is the premier class and it will remain that way - in whatever form."