What is the Meaning of the Fermi Energy?

In summary, the Fermi energy is the highest energy state of a system at absolute zero temperature in physics. It is determined by the number of electrons and energy levels available to them, and can be calculated or measured experimentally. The Fermi energy is significant in understanding the behavior of electrons in a material and is often used interchangeably with the Fermi level, although they are not exactly the same. The Fermi energy can change due to external factors and can also be manipulated in certain materials.
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chikchok
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Is fermi energy is the energy of one of the two electrons located in the state n=1?
The Fermi energy Ef is defined as the energy of the topmost filled level in the ground state of the N electron system. Ground state is n=1 level. And in the ground state there can be only one orbital right? One orbital can have only up to 2 electrons. Does this mean that fermy energy is the energy of one of the two electrons located in this orbital (in n=1 state)?
 
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The ground state is only n=1 for hydrogen and helium
 
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