Power-generation facilities require tightly controlled water chemistry to protect boilers, turbines, condensers, cooling towers and heat-transfer equipment. Treatment programmes use oxygen scavengers, corrosion inhibitors, antiscalants, biocides, pH-control chemicals and filtration technologies to prevent deposits, microbial growth and equipment degradation. Cooling-water consumption, boiler efficiency and wastewater discharge are major operational considerations across thermal and nuclear plants. Water scarcity and stricter environmental requirements are increasing investment in recycling, high-recovery treatment and zero-liquid-discharge systems. Digital monitoring and automated dosing are also improving chemical efficiency and predictive maintenance. Research coverage assesses boiler- and cooling-water chemical demand, treatment-system investment, supplier strategies, plant-modernization activity and opportunities in reuse, geothermal water treatment and digitally controlled utility-water operations.