During the past years, liberalisation of electricity sectors in many countries has taken place, changing significantly the general framework. A subject of increasing interest is the access of market actors to the transmission network and the remuneration of realised wheeling transactions. Various pricing methodologies have been discussed extensively and are now adopted inhomogeneously by different countries. This presentation gives a survey of the existing models and their advantages and disadvantages. It examines the impact of wheeling transactions on the state of the transmission system. Furthermore, it agrees to the treatment of losses and deviations from the scheduled energy. For this purpose, an object-oriented software-package presented in earlier papers for operation, simulation and analysis of electrical energy systems is used.
