The issues of optimizing the operation of thermal power plants, which include combined cycle gas turbine units (CCGTs), are considered to increase their efficiency and reliability. The energy system of Algeria is considered as an example. The study highlights the importance of using modern technologies to improve the efficiency and sustainability of the country’s energy system, which is 99.5% dependent on fossil fuels. The focus is on analyzing current trends in the electrical power industry and the characteristics and performance of the General Electric (GE) 9FA and 9FB series turbines used at Bellara Station. A detailed analysis of the technical characteristics of turbines, their performance and the influence of climatic conditions on their operation was carried out. Particular attention is paid to the influence of temperature and humidity on the efficiency of turbines, which is especially important for the climatic conditions of Algeria. High temperatures reduce turbine performance, requiring the use of inlet air cooling systems. An example of using the relative increment method for optimal load distribution between power units is given. Formulas for calculating optimal loads are presented and graphs are presented illustrating the distribution of load between units. Optimizing operating modes can significantly reduce specific fuel consumption and minimize equipment wear.