This document summarizes a solar power tower system. It focuses on concentrating sunlight from an array of sun-tracking mirrors (heliostats) onto a central tower-mounted receiver. The receiver heats a molten salt heat transfer fluid that is then used to generate steam to power a turbine and produce electricity. Thermal energy can also be stored in the molten salt for hours to allow electricity production when solar radiation is unavailable. Examples of commercial solar power tower plants currently in operation are provided.