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This paper gives an overview of grid impact indicators that could be used to assess the impact of the energy exchange with a single intelligent building on the electricity grid. Seven indicators are given, the capacity factor, loss of load probability, cover factor, one percent peak power, peaks above limit, dimensioning rate and kVA credit. An example of a building simulation is used to show what these indicators can teach us. For this example the indicators are calculated and an explanation of what they show is given. Finally a summary of the grid impact indicators is given in the conclusion of this paper.