Alkaline water electrolyzer (AWE) offers a unique solution for generating hydrogen (H2) gas via an electrochemical water-splitting process. The major drawback of the AWE is its limitations in driving high-current densities, an important criterion for the industry standard. In this work, we have demonstrated the bi-functional electrocatalytic properties of ReS2 nanosheets towards hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) with low overpotential (139.2 and 258.89 mV for HER and OER) and Tafel slopes, respectively. The micro/nano electrocatalytic activity of the ReS2 electrocatalyst was examined using a scanning electrochemical microscope (SECM). A lab-scale AWE fabricated using prototype ReS2 electrocatalyst demonstrated that they could drive the benchmark current density (10 mA cm−2) with a low cell voltage of 1.645 V. Further, we also demonstrated a self-powered system comprising an on-shore wind-energy driven ReS2 AWE for sustainable H2 production. Further, the experimental results based on industrially recommended conditions for AWE illustrated that they need only 1.85 V to drive a current density of 500 mA cm−2; thus, ensuring their candidature towards high-rate AWE for clean hydrogen production.