Silos are the commonly used storage structures in production industries such as cement factories, power plant structures etc. When a Silo is used in the Thermal power plant structures it should be capable of storing ashes with high temperature. When compared to the Steel Silos, performances of RC Silos are better due to its easy construction and maintenance. In this thesis design and analysis of Fly ash and Bed ash Silo for thermal power plant structures was carried out with the sequence of preparation of plan, calculation of loads & load combinations, analysis using STAAD PRO and design as per Indian Standards. The height and diameter of two Silos are different and they are connected by a staircase.