The book "A Case Study of Cogeneration Power Plant at Saurashtra Chemicals Ltd." offers a comprehensive analysis of the efficiency of power plants, particularly in the context of fuel prices and energy production. It examines the operation of a power plant that generates 25 MW of electricity and 120 TPH of steam, utilizing exergy analytical methods to evaluate thermal energy generation. By applying the first and second laws of thermodynamics, the energetic and exergetic performance of the power plant is assessed. The results of this study are significant for the design, evaluation, optimization, and improvement of thermal power plants. The detailed investigation of exergy efficiency and exergy losses provides valuable insights into the actual performance and sources of loss within the system.