System deviation

System deviation is the difference between the planned and actual production or consumption of electricity in the power system. This deviation occurs when actual production or consumption deviates from predicted values, which can affect the stability and reliability of energy supplies.

Each settlement entity creates a day-ahead plan for the consumption and production of electricity for its balancing group and is responsible for deviations caused by incorrect planning. The system deviation in each trading quarter-hour is the sum of the deviations of all settlement entities.

The system deviation can be positive or negative. A positive deviation occurs when the total consumption in the system is lower than the planned amount, indicating a surplus of electricity. A negative deviation occurs when the total consumption is higher than planned, leading to a shortage of electricity in the grid.