We will show that we can model the Planck´s length expansion (1.28 10⁻⁵⁴ m < Lpɢ < 1.61 10⁻³⁵ m) as a function of the redshift z. Recall that in the theory: RLC electrical model of a black hole and the early universe, we proposed that when a black hole forms the Planck´s length corresponds to Lpɛ = 1.61 10⁻³⁵ m; as the black hole grows, the Planck´s length decreases until the black hole reaches its critical mass and then disintegrates, at which point the Planck´s length reaches the value of Lpɢ = 1.28 10⁻⁵⁴ m. This will allow us to understand dark energy and the Hubble´s tension problem, that is, the discrepancy with the Hubble´s constant.