Repowering one of the old Indian wind farms located at a potential wind site is discussed. Various options of repowering have been suggested and compared based on annual energy production and levelised cost of generation. Economic performance indices of repowering in the current wind power policy scenario have been evaluated and the feasibility is discussed. The study infers that partial repowering could be economically more attractive than total repowering, whereas total repowering of old wind farms located at potential sites would be essential to meet renewable energy targets of a nation like India.

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An improvement in performance of hybrid solar system with use of liquid metal alloy GaInSn as a coolant has been demonstrated in this study. The performance of hybrid system using GaInSn, water, and air as coolants under different operating conditions such as ambient temperature, different inlet velocities of fluid, solar irradiations is analyzed using simulation software ANSYS and the results obtained are validated using experiments. The results obtained from simulations and experiments are used for determining important performance criteria such as electrical efficiency, thermal efficiency, and exergy efficiency. The exergy, thermal, and electrical efficiencies were found to be at least 11%, 12%, and 12% higher for hybrid system using GaInSn as a coolant when compared to hybrid systems using air and water as coolants, respectively.