Our Moon Environment Simulator recreates electrostatically charged lunar-surface conditions and provides a repeatable experimental platform for evaluating technologies that interact with charged lunar regolith. Lunar regolith simulant is spread to a thickness of approximately 50 mm in a 1,040 × 2,000 mm acrylic tray. Because electrostatic charging is highly sensitive to atmospheric moisture, experiments are conducted inside a humidity-controlled, nitrogen-filled glovebox. A negative-ion generator applies voltages of up to −20 kV to charge the simulant surface. Mounted on a linear actuator, the charging device moves across the tray to generate a wide charged test area, while the resulting surface potential is measured using a non-contact electrostatic sensor. Following surface charging, test devices can be translated or driven across the regolith to quantitatively evaluate surface-potential measurement, electrostatic charge mitigation, contact electrification, and electrical energy-harvesting performance. The simulator supports a wide range of lunar-surface technologies, including wheels, rovers, electrodes, sensors, and payload systems.