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Using an exhaust-driven generator integrated to the turbocharger doesn't seem to belong in the unicorn corral, but I still consider it more as a complementary source of electricity instead of a replacement for a traditional alternator. The only way to get rid of the alternator in a production car with an internal-combustion engine so far is still a hybrid setup, but it's also possible to keep the alternator and actually use it as an auxiliary motor to provide some mild-hybrid ability like in GM's e-Assist.
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