Energy Sources can be classified as primary and secondary energy sources. Primary energy sources are normally categorized as renewable and non-renewable on the basis of their depleting characteristics. Renewable energy derived from natural resources and they are automatically replenished. It is also known as clean energy sources. Secondary energy sources are derived from transformation of primary energy sources i.e. heat and electricity. Renewable energy sources are inexhaustible but as per Indian climatic conditions solar energy is most suitable energy source.

Solar Photovoltaic (PV) and solar thermal both are efficient, getting popularity all over the globe. Selection of them is depends on utility, suitability. For energy storage and 24x7 energy supply solar thermal technology is getting more popularity than solar PV technology. Solar thermal technology is also acknowledged as Concentrating Solar Power (CSP).

CSP systems could be cost-effectively feasible at minimum 1600-1800 kWh/m2/year Direct Normal Irradiance (DNI) by utilizing novel technologies, substances, economies of scale and supporting renewable policies, etc. CSP systems have a range of prime objectives. These are to work environmentally safe, to diminish primary cost and ground area, to increase long-term system trustworthiness, to make possible ease in service and maintenance. Sequestration of one ton of Carbon Dioxide-Equivalent (C02-e) equivalent to one CER unit. CSP technologies can be categorized as line and point focus,