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We show in this work how a sub-100 GeV Z in a U (1) extension of the Standard Model (SM) can emerge through Higgs mediated channels at the Large Hadron Collider (LHC). The light Z has minimal interaction with the SM sector as well as vanishing kinetic mixing with Z boson which allows it to be light and below the SM gauge boson masses. Interestingly such a light Z is very difficult to observe in the standard production modes. We show that it is possible to observe such a gauge boson via scalar mediators that are responsible for the symmetry breaking mechanism of the model. The model also provides a dark matter candidate whose compatibility with the observed relic density is established due to the light Z . We also comment on other interesting possibilities such a light Z may present for other observables.