Casimir, Inc. claims to have built a device that harnesses Casimir forces to generate free energy, measuring voltage drops between plates and pillars in their prototype. The company says this effect stems from quantum tunneling mechanisms similar to those in quantum cascade lasers, where electrons lose energy through acoustic waves in crystalline materials.

The underlying physics isn't entirely implausible—electrons tunneling between locations with slight energy differences could theoretically create measurable potential differences. However, the referenced paper allegedly predicting these results appears to lack actual predictions, raising questions about the scientific rigor behind the claims. Surface chemistry and material properties could easily explain the observed voltage changes.

Even if the effect is real, extracting usable energy presents fundamental challenges. Connecting the device to external loads would introduce additional potential differences at metal junctions, requiring charge accumulation that eventually halts current flow. The entire system would grind to a halt without sustained energy extraction.

While the concept builds on legitimate quantum phenomena, the practical implementation faces insurmountable thermodynamic barriers. The venture appears more likely to burn through venture capital than power homes.