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by chockablock 4255 days ago
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).