This is what Toyota says on their site... nothing bout "Supra" but its basically then next one.
"In 1800, Alessandro Volta arranged zinc and copper discs in a column and invented the battery. 204 years later, Toyota has electrified automotive history with the first high-performance hybrid, named in his honor. The Giugiaro-designed carbon-fiber body seats three people abreast and features "drive-by-wire" controls, allowing you to position the steering wheel and pedals in front of any one of them. And the Volta's 408-hp Hybrid Synergy Drive (a 3.3-liter V6 with an electric motor for each axle) not only delivers 435 miles on a 13.7-gallon tank, but 0 - 60 acceleration in a mere 4 seconds. Somewhere, Count Volta is smiling."