The Hydro electrolyser design implies an automatic range in gas productionvolumes from 20% to 100% according to demand. Labour costs are reduced toa minimum and only routine shift inspec-tions are required. The availability of ourelectrolyser plant is typically better than98%. Accordingly the intervals betweenoverhauls are typically seven to tenyears. A general cell overhaul for our largest units requires only 3 to 5 daysdown time.