These references clearly demonstrate that ZPE is real:
A thought experiment published by physicist Robert Forward in 1984 demonstrated how the Casimir force could in principle be used to extract energy from the quantum vacuum (Phys. Rev. B, 30, 1700, 1984). Theoretical studies in the early 1990s (Phys. Rev. E, 48, 1562, 1993) verified that this was not contradictory to the laws of thermodynamics (since the zero-point energy is different from a thermal reservoir of heat).
Inertial mass and the quantum vacuum fields
Bernard Haisch, Alfonso Rueda & York Dobyns, Annalen der Physik, 10, 393-414 (2001).
Inertial mass as reaction of the vacuum to acccelerated motion
A. Rueda & B. Haisch, Phys. Letters A, vol. 240, No. 3, pp. 115-126, (1998).
Inertia as a zero-point-field Lorentz force
B. Haisch, A. Rueda & H.E. Puthoff, Physical Review A, Vol. 49, No. 2, pp. 678-694 (1994).
Plus numerous others quoted at the bottom of this link
http://www.calphysics.org/zpe.html
And it’s discussed in this link
http://www.nature.com/nature/fow/010719.html
The question that now arises is whether there are real practical commercial applications.
I'll try to find something on this.