The current document suggests a possibility to generate hydro-electric power by combining a low head hydro-turbine with an existing coal-based thermal power plant. A comparative analysis is conducted by comparing scenarios with and without adjustable moving blades on the hydro-turbine. The findings demonstrate that incorporating a surface hydro-kinetic turbine system into the cooling water system of a 500 MW power plant can produce approximately 170 kWh of clean energy with a cooling water flow rate of around 16.7 m3/s and a gross head of about 1.5 m between the cooling tower (CT) and the cooling water (CW) basin. The efficiency of the hydro-power plant with fixed-moving blades is lower than that of the adjustable blades due to the reduced turbine efficiency at low flow velocity. This proposed system is expected to reduce the CO2 emissions of the primary plant by approximately 3.34t/day. The power generation cost and the simple payback period for the proposed mini hydro project at full capacity are approximately INR 2.1/kWh and about 6 years, respectively.