The aim of this project is to use the energy analysis based on the first law of thermodynamics to identify the locations and magnitudes of losses in order to maximise the performance of a 25 MW plant at Nirma Company Ltd., Porbandar, to evaluate the overall plant, boiler, and turbine and subsystem efficiencies. Energy flows in a boiler have been shown in this paper. The boiler efficiency is calculated using indirect method after estimating the various heat losses in the boilers. From results the overall thermal efficiency of the plant is obtained by computing the individual efficiency of the boiler (79.4%), steam turbine (33.57%), and generator (98%). The overall efficiency of the plant appears to be 26.2%.Keywords: Energy, boiler efficiency, extraction back-pressure turbineCite this ArticleMilan Pankhaniya, Akash Shukla, Ashutosh Joshi, et al. Thermodynamic Analysis of 25 MW Cogeneration Plant. Journal of Thermal Engineering and Application. 2016; 3(1): 55–60p.