A morally questionable organization is developing a power source based on quantum fluctuations (zero-point energy), citing the Moray generator, freedom particles, the Searl effect, and so forth as foundational research.
Since these are at best theoretical, using known science as a springboard, what possible adverse effects might occur as a result of tapping into an infinite, free power supply (other than human-induced such as socio-economic fallout or nefarious political schemes)?
The answer doesn't have to be explicit or even feasible, just plausible, along the same lines as a Hadron collider spontaneously creating a black hole or a tear in spacetime, or EM fields disrupting brainwaves and causing cancer. It will be dumbed-down for a teenage protagonist when put into use. The only major criterion is that the negative effect must be evidential/discoverable by a layperson. Any ideas?