Question

I'm a real "powerhouse".

That's plain to see.

I break down food to release energy

Answer 1

It is the mitochondria.
It is an organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur. It has a double membrane, the inner layer being folded inward to form layers (cristae).
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Answer 2

The Mitochondria! i hope this helped.