[en] The conference paper deals with the Alta hydroelectric power station being set into operation in May 1987. General rules for running the power station were given by the Norwegian authorities. In order to avoid difficulties like increased river bank erosion, ice-runs and death of fish due to sudden decreases in discharge, it has been necessary to work out a special strategy for running the power station. Discharge values from 1988 to 1990 in the Alta river downstream the power station is compared to simulated unregulated discharge values. It can be seen that today's regulated conditions differ very little from the natural situation. 4 figs., 2 tabs