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Since the incentive regulation has started in Germany in 2009, system operators have a predetermined revenue cap, so that they have the incentive to reduce costs in order to increase their profit. Apart from this they have to prepare a trade balance every year but also consider the requirements of the Federal Network Agency for the grid fee calculation. Due to this fact the asset manager requires information concerning the long term costs. Therefore this paper presents two different possibilities to calculate the yearly costs over a long time period. The first method for calculating the yearly costs (e.g. capital expenditures (CAPEX) and operational expenditures (OPEX)) have been done with a simulation software called Powersim Studio® which bases on system dynamics and markov models, respectively. The other method has a statistical background and uses the normal distribution in order to calculate the yearly costs.