It's a flywheel/electric system -- the regen generates electricity to spin the flywheel, and then the flywheel generates electricity to power the front wheels. They had a turbo diesel V6 in the rear.
The Toyota system was an electric motor on the rear wheels (along with the gas V8) and it used supercapacitors to store the energy.
For 2014 ALL the LMP1 cars have to be hybrids, I think.
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