Generation capacity refers to the maximum amount of electricity that can be produced by a power plant or an electrical generating station in a given period, usually measured in megawatts (MW). It is determined by several factors such as the efficiency of the turbines used, the availability and quality of fuel, maintenance schedules, and environmental regulations. The generation capacity of a power plant can vary depending on these factors and it is an important measure to determine how much electricity can be generated from different sources to meet the demand in a region or country.