The cross-border trade impact on the transmission losses

Due to the current path of least resistance, the loop flows are natural phenomena in interconnected power systems. In addition, the cross-border trade causes transits trough the hosted power systems from the sink to the source. As result, due to transits, transmission losses are increased in hosted power systems. This paper detects the main statistical correlation between the cross-border trade and the transmission losses, in order to improve the Bulgarian transmission system operator forecast for procurement of electricity to cover the losses and to minimize imbalances.