What is the beginning date of this inaugural season of a new FIA Champoinship for electrically powered cars, in which the Buenos Aires ePrix was first raced?
Buenos Aires ePrix:  It was first raced in the 2014–15 season. 2014–15 Formula E season: The 2014–15 FIA Formula E season was the inaugural season of a new FIA championship for electrically powered cars. 2014–15 Formula E season:  It began on 13 September 2014 at Beijing in China and finished on 28 June 2015 in London after eleven races.
i don't know