Pretty amazing. It's in a F1 car. Formula 1 racing is interesting in many ways, and one way is they don't do fuel stops--all the gas they get is what's in the car at the start. And according to the Road & Track article (linked below), they're putting one in a street car.
Mercedes-AMG's F1 Can Make More Power Than Waste Energy
Here's more of the techie details off the Mercedes/AMG web site. Among the clever things I wish I'd thought of myself is the turbocharger with a generator/motor between the in-and-out turbines, providing electric power boost to the turbo when needed, and turbine powered battery charging when not.
https://www.mercedesamgf1.com/en/mer...s-engineering/