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In the network planning phase, the maximum harmonic emission limits will be allocated by network utilities to individual distorting installation, which will be connected to systems. Each distorting installation is responsible for maintaining its harmonic voltage as well as current levels within the allocated limits in order to avoid the overall harmonic problems in networks. This paper gives the overview of the assessment procedure of emission limits for connection of distorting installations to High Voltage (HV) and Extra High Voltage (EHV) systems as well as the concept of sharing planning levels for harmonic voltages according to the technical report IEC 61000-3-6. In this paper, some new concepts are introduced and implemented as the extension to the method proposed in IEC 61000-3-6 under consideration of the global and future harmonic emission. The proposed method suites network calculations without complicated algorithms and could be seen as complementary to IEC 61000-3-6. The method introduced in this work would contribute to lower harmonic emission limits to the new distorting installations. However, this would be necessary especially in the environment where harmonic distorting degree in neighboring networks is strong and the new distorting installations should not contribute to overall harmonic problems in the considered system. At the end of this paper, a calculation example of wind power grid integration in the aspect of harmonic planning levels is given in order to demonstrate the simplified application of the presented method in this paper.