We really cannot answer this question for sure because the Tesla coils are not free energy generators, but rather are used to store energy. The energy is used to operate the Tesla coils and then it is stored to generate electricity and for future use.
If the free energy is generated outside of the Tesla coils, where do the energy generated from the free energy become electric? There are three ways to produce electrical energy in any given system: thermal energy, electromagnetic energy and kinetic energy.
Thermal energy is produced when materials in the power system such as the electricity turbines, which store energy, heat the air. When the air rises, the temperature is increased. The air is warmed and that leads to electrical energy being stored in the materials stored inside the Tesla coils and in the air itself. This process is called thermoelectrics.
Electromagnetic energy is generated inside a Tesla coil when the atoms in the air come together under a magnetism that holds its atoms together. This process is called magnetic fields.
Kinetic energy happens when a moving object hits another stationary object such as a building. The kinetic energy can be either added to or subtracted from the initial energy that was generated. The result of a collision is either new kinetic energy, which is stored in the moving object and that creates a new source of energy, or the new energy is stored in the moving object. However unlike the kinetic energy, which is created by moving, the energy in kinetic energy is created when an object is stationary.
Let’s say we want to build a building. We don’t want it to burn or explode because we want our building to last forever. That is a good idea, but we don’t want it to last forever, so we want to store as much energy as possible. That is called storing the energy. What is the most efficient way to store the energy?
If we want to build a machine that makes as much money as possible, then we want to put the most efficient machine possible into the building. But a good machine can only produce a certain amount of output, which means we have to store that output for later use. That is called storing the output, and that is why power plants store so many different kinds of energy: to store energy so they can produce more energy next time.
I have just shown you that energy stored in batteries is not really free energy. As a consequence, there are many types of efficiency in batteries that are not free, some of them called non
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