One site states that Aether and Zeropoint Energy are the same thing. I believe Zeropoint energy is actually the energy collected by the natural existence of a black hole. Since a black hole has more energy than we could ever imagine using, we consider what is in the center "free energy." This is similar to our view of the sun being a renewable energy source.. because it will be around for millions of years. Zeropoint energy is abundant by hypothesis. Aetheric energy is energy that exists by the nature of space. The vacuum is actually an energy bed of sorts, in the theory of the aether. This means energy is available, but changing it into useful forms is another story. Zeropoint (singularity) energy is considered to be in an active form (kinetic) and can therefore be used for mechanical purposes.
That's who it works as I understand it.