The electricity markets in Europe are growing together and therefore understanding of cross-border flows becomes more and more important. Due to Market Coupling the method for allocating cross-border transfer capacity is changing, from explicit to implicit auction. This results in strictly price driven cross-border flows. In this thesis a model for forecasting price driven cross-border flows is developed. The problem of finding the optimal cross-border flows, is modelled as a linear optimisation problem. The flows are found by minimising production cost in all involved areas for 24 hours at a time. The optimisation is subjected to constraints that derive from technical restrictions on the interconnecting cables. From simulation it is shown that the modelled flows are close to the real flows. The model is also compared with an existing model and the results are at least as good, sometimes even better. This is very good for a fully flexible model.