Theoretically, humans can benefit from the energy of black holes.

    

.

Theoretically, humans can benefit from the energy of black holes.

What if we can predict the location where the FRB (Fast Radio Burst) or GRB (Gamma-ray burst)? That thing allows us free energy for millenniums. Theoretically, the energy of those highly energetic bursts can collect and store in the battery. Which gives energy to the entire Earth for millenniums. But the problem is that we must predict the location where those impulses travel. 

The energy can collect from FRBs by using a normal radio antenna. If the frequency and location of that energy radiation will predict. And maybe we can benefit from that energy in the future. The energy level in gamma-ray bursts is extremely high and in a couple of seconds released energy level will go over the energy, that the sun will create during all its life. 

There is the possibility to use the gravity of a black hole as a particle accelerator. In that case, the energy of electrons is rising by using gravity fields to increase their speed. 

The energy can load to electrons by accelerating it by using the gravity energy of the black hole. So there are required two satellites, which are shooting electrons to parabolic trajectory near the singularity. The gravity field will accelerate the speed of those particles and that will increase the energy of the electrons.

When the electrons are traveled past the black hole the other satellite will receive them and release their energy to the electric systems. The electricity will transmit by using maser-transmission to the users. 

But also the magnetic field can benefit for energy production.

We must remember that black holes are also repelling objects and that repel is the reason for the powerful magnetic fields of the black hole. So if positive particles are shot near the black holes north pole the magnetic field can push the particles back.  

The black hole is surrounded by an extremely powerful magnetic field, which can use as "negative energy". That means a black hole is a polar particle. If we are shooting protons to the north pole of the black hole and electrons to the black holes south pole, the magnetic field will push those particles back to the shooter. And during that journey, the particles will be loaded by the powerful radiation, that surrounds every single black hole. So this is one way to benefit the power of black holes. 

Another way is to create an artificial black hole or travel to the black hole and turn its transition disk into an energy source. The energy can collect from the transition disk by using solar panels. But the transition disk around black holes has one quality, that nobody ever mentions. The transition disk can turn to negative energy. 

The intensive heat in that the material disk around black holes causing that the radiation from the disk is throwing particles away from it. The material disk of the black holes can benefit energy production in the other way. 

The particles like protons or electrons can just shoot to the transition disk, and then it will push them back. The radiation that comes out of the disk will load the particles with energy. Or otherwise, there is the possibility to use the magnetic field of the black hole itself. As I wrote earlier. 

https://www.popularmechanics.com/science/energy/a35276127/harnessing-energy-from-black-holes/