The passive voice issue is secondary to the other issues of the sentence:
1) Ambiguous antecedent - to what does "which" refer - special hardware? Lower energy consumption?
2) Exploiting is not a noun. "The exploitation of special hardware..."
Perhaps: A well-known technique to lower energy consumption is the exploitation of special hardware. ...
Exploiting can be a noun: https://en.wikipedia.org/wiki/Gerund
An example from the abstract of my (unpublished) dissertation: Exploiting special hardware is a well-known technique to lower energy consumption, which is another important aspect that must be balanced with raw performance.
I don't want to use active voice, because at this point nobody cares who does the balancing. Using you (...that you must balance...) seems not suitable in an abstract.