Sulfur dioxide (SO2) is a primary human-generated sulfur based air pollutant. Combustion of coal in Thermal power plants emits huge quantity of sulfur dioxide which poses several health hazard when exposed over a longer time. Flue gas desulfurization (FGD) technologies play a critical role in the reduction of oxides of sulfur (SOx) emissions from coal-fired power plants, a significant source of air pollution and acid rain. Semi-dry flue gas desulfurization (SD-FGD) technology, has garnered attention due to its effectiveness and versatility. This research paper presents a comprehensive performance evaluation of SD-FGD technology when applied to pulverized coal fired boilers. This research paper provides an in-depth analysis of the application and performance evaluation of SD-FGD technology in pulverized coal fired boilers (PFB) using Novel Integrated Desulfurization (NID), including its principles, mechanisms, operational considerations, and advantages, and, this study aims to provide valuable insights into the effectiveness of SD-FGD in emissions control for coal-fired power generation.