Distributed generation feeds into the distribution part of the electric grid. As it is constructed with power flows going from higher to lower voltages, there might be problems with overloading and high currents, caused by more production than consumption in the area fed by a substation. 

To estimate the impact of generation connected to the distribution system, there is need for a statistical description of the production. Five years of data from a solar power plant in Luleå have been analysed statistically. Also, a physical model has been applied. 

The results show that the physical model manages to predict reasonable the data. There right-hand tail is reasonably similar from year to year.