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In the retarder, what is the energy turned into? Heat?

I will admit I'm not up to date with the hybrid cars. Though I do find it amazing how tech keeps getting more usable energy out of a drop of petrol. And by the way, I never figured that I would ever see the price of gas go under $2. Carry on with the engine brakes. Sorry for the derail.

Maybe someday someone will develop a way to harness all the power lost during downhill braking, store it, and use it to help power the rig back up the next grade. Like winding spring, or compressing air. Maybe it's already here, but I haven't see or heard of it. Anybody?