The second way to improve the model performance would be to introduce additional input information, such as:
• the capacity of generating units (or rather, the distance between the system operating point and the reserve margin level);
• the start-up costs of turning on units and their running costs in the case where the system operating point approaches the reserve margin level; and
• the structure of generating plants in the power system that impacts the reserve margin ‘‘stability’’ (it is less stable when many renewable energy sources, such as wind and photovoltaic power plants, are working in the power system. Because the share of these unstable sources depends on weather conditions, such as wind speed, insolation and cloud cover, the introduction of these weather variables into the model should have a positive effect).