A further expansion of solar energy is impeded by high cost of solar-grade silicon used in photovoltaics. Carbothermal synthesis of silicon carbide (SiC) followed by reaction of SiC with quartz is a novel and economical approach for production of solar-grade silicon. The book presents results of investigation of the carbothermal reduction of quartz to SiC and production of silicon from quartz and SiC in different gas atmospheres, and reaction mechanisms. The book can be of interest to students and researchers engaged in research and production of solar-grade silicon.