The Bâtiment des Forces Motrices (BFM) is easily accessible via public transport. The closest stops are Bel-Air and Stand. From Geneva main station, you can use a number of tram (14, 15, 18) and bus lines(1, 3, 5, 10, 19).
On foot, the venue is only 13 minutes from the station.
By car, nearby parkings are Seujet, Hotel des Finances and Tribune de Genève.