Most reported anion exchange membrane water electrolyzers (AEMWEs) are currently limited to the usual 1−10 cm 2 electrodes in singlecell AEMWEs; however, accelerating its technology readiness level necessitates an explosive increment in unit sizes. We report the design, characterization, and validation of a 1 kW, 500 cm 2 (5 × 100 cm 2) non-PGM AEMWE stack. Complete with corrosion protection, internal heating, and a control system, the patented stack design operated stably at 1.0 A cm −2 with an energy efficiency of 53.2 kWh kg Hd 2