Our goal is to produce high-purity silicon from natural 99.7-99.9% pure quartzite (SiO2) in only one-step, utilizing molten salt electrolysis with a state-of-the-art molten salt composition. This process can produce silicon with 4-6N purity using <30 kWh/kg, with pure oxygen by-product and zero direct Greenhouse Gas (GHG) emissions. The 4-6N product purity would be sufficient for directional solidification or direct boule/wafer production, resulting in a low-cost solar-grade silicon, i.e., 75-80% lower than today. Besides considerable silicon price reduction, our novel technology removes currently presented safety and environmental concerns of silicon production.