The article discusses 2 different engine designs: -A prototype with 2 conventional turbos and a third electric "e-booster" to help spool them up. This one is "

The article discusses 2 different engine designs: -A prototype with 2 conventional turbos and a third electric "e-booster" to help spool them up. This one is "five to 10 years" away. -A 2.0L 4-cylinder 'Drive-E' engine coming to market on the 2016 XC90 that has a turbo- and a supercharger (but no electric fan).