  To ensure the smooth and near optimal operation of storage and controllable
generation in a grid with a high share of renewable energies, it is important
to have accurate forecasts for load and generation. But even with the advanced
forecasts available today, the prediction error can have a significant impact
on the operation performance of the system. This paper compares and analyzes
the impact of the prediction-error on the operational performance in case of a
small virtual power plant.
