Electricity generation and consumption must be exactly balanced every time. The objective of APG as a control area manager is to maintain this sensitive balance in Austria .

THE indicator of the quality of this equilibrium and thus for the quality of supply of the end-user is the frequency of the system which has to be close to 50 Hertz (Hz) . If there is an imbalance between production and consumption, the frequency changes. For example, if a large power plant is shut down there is suddenly a lack of production in the grid and the frequency decreases. Vice versa, the frequency rises above 50 Hz, when more power is generated than consumed. Because of the new installation of strongly fluctuating power generation - consisting preliminary of wind and solar power, APG must intervene balancing more often and with increasing efforts.

The publication of actual frequency of the system is on a voluntary level and not part of the obligations defined in Regulation (EU) No 543/2013.