In 1966, the first tidal power station with stainless steel turbine blades was completed in France. The Rance Tidal Power Station is a tidal power station located on the estuary of the Rance River in Brittany, France.In order to be able to construct the structure across the estuary, two dams had to be built to block the Rance river during the first two years of the construction phase to ensure that the estuary was completely drained. The reason that the Rance River estuary was chosen was due to its large tidal range; it actually has highest tidal range in France. It has an average tidal range of 8m between low and high tide, while the spring and neap range can be as big as 13.5m.
Its 24 turbines reach peak output at 240 megawatts (MW) and average 57 MW, a capacity factor of approximately 24%.
Salt water causes corrosion in metal parts. It can be difficult to maintain tidal stream generators due to their size and depth in the water. The use of corrosion-resistant materials such as stainless steel, greatly reduces, or eliminates, corrosion damage.
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Pic:A stamp showing Range Tidal Power Station