  We propose here - for the first time in the literature, to our best knowledge
- an electroweak unification based on the $SU(5)_{L}\times U(1)_{Y}$ gauge
group. The spontaneous symmetry breaking takes place in the manner
$SU(5)_{L}\times U(1)_{Y} \rightarrow U(1)_{em}$, due to a particular Higgs
sector consisting of five scalar quintuplets. Each scalar quintuplet acquires
its own vacuum expectation value, by means of a proper parametrization which is
worked out once the overall vacuum expectation value in the model is
established. The decoupling of the low energy regime (corresponding to the
Standard Model) from the high scale (required by out model here) is
straightforwardly achieved in order to preserve the consistency with the
present experimental data. Finally, a promising phenomenological outcome is
derived by simply tuning a single free parameter. Our results include, besides
a viable one-parameter mass spectrum, also the prediction of precisely three
generations in the fermion sector and the electric charge quantization.
