I am a firm believer in the electric sun hypothesis. Check out http://thesurfaceofthesun.com for some background. There are two inventions by experienced scientists that are reportedly over-unity by taking advantage of plasma discharges. The excess energy cannot be explained with conventional physics. Aether physics modeling is more appropriate. Many believe the same phenomenon occurring in these experiments also happen in the plasma atmosphere of our sun. Since both inventions appear to be drawing energy from the vacuum, I'll refer to them as zeropoint energy devices.

First invention: SAFIRE project plasma experiments:

Montgomery Childs from the SAFIRE project; (8:13 minutes) "This cloud of ions got so dense it blew off into the chamber atmosphere. There was a pressure spike during these events. Even more importantly is that although we limited the power to only 1800 watts DC, the oscilloscopes measured a short lived power surge of over 2 million watts. At times, at over 10 million watts. To offer some perspective on this, the Bruce Nuclear power plant in Canada, the largest one we have, produces 7 million watts. " https://www.youtube.com/watch?v=CFsTttzh0oA

Second invention is by Dr. Paulo & Alexandra Correa known as the PAGD (Pulsed Abnormal Glow Discharges) that utilizes very specific types of plasma discharges.  It was endorsed by the late Dr. Eugene Mallove. There are two successful independent replications at this time. We need more replications and hopefully improvements. Inventor mentioned achieving greater yields but hasn't disclosed details.

http://overunity.com/15081/moray-and-correa-tube-experiments/dlattach/attach/145645/
https://www.overunityresearch.com/index.php?topic=17.0
http://overunity.com/1965/correas-pagd-in-action/

Note: Correa patents are expired.

My theory:

Neutrino interaction cross-section with nucleons is energy dependent. At >~1 TeV, the cross-section of interaction rises sharply. Below that, it's still energy-dependent, but non-linear.

https://arxiv.org/pdf/1711.11043.pdf
See the chart on page 4.

Above a few GeV, neutrino-nucleon interactions are typically deep-inelastic scatterings (DIS), where the neutrino scatters off one of the constituent partons of the nucleon (a quark or a gluon). This typically knocks the quark loose, but due to quark confinement, a new quark is immediately pulled from the quantum vacuum to keep the nucleon intact, and the quark knocked loose undergoes hadronization, scattering into a particle shower, extremely short-wavelength photons and extremely high-energy virtual photons (ie: magnetism).

So the energy gain in the above devices may well be because the higher energy levels increase the probability of neutrino-nucleon interaction. The absorption of neutrino kinetic energy by neutrino-nucleon interactions and the resultant quark being knocked loose sets off a cascade as the unconfined quark hadronizes, which releases the energy of that quark... energy straight from the quantum vacuum.