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Anderer Ressourcentyp

Siemens Stiftung

Tidal power plant

Simulation:Operating principle of a tidal power plant A tidal power plant makes sense if the height difference between high and low tide is very large. The first (since 1966) and largest tidal power plant is located in Saint-Malo, France (240 MW, 600 million kWh of electricity per year). There are others (or others are planned) in Canada, Russia, and China. The tidal power plant harnesses the power of the enormous water movements during high and low tide. For this purpose, a dam is built across a bay or the mouth of a river and turbines are installed inside the dam. At high tide, the water flows from the ocean side into the bay through the turbines. At low tide, the water flows in the opposite direction and also drives the turbines. Primarily Kaplan tubular turbines are used in this case. Other tidal power plants do without a dam; instead of making use of the height difference of the tides, they take advantage of the currents produced by the tides ("tidal current power plant”).

Anderer Ressourcentyp

Siemens Stiftung

Storage power plant

Graphic:Operating principle of a storage power plant In a storage power plant, naturally flowing water is dammed up by means of an artificial reservoir and stored for times of peak demand. The accumulated water is then fed to the turbines of the low-lying power plant via penstocks. All the potential energy of the water in the storage reservoir is thus an energy store for times of peak demand. Smaller storage power plants use Pelton turbines, while large storage power plants (high pressure and large volume of water) use Francis turbines.

Anderer Ressourcentyp

Siemens Stiftung

Wind power plant at sea

%hoto:View of the Middelgrunden offshore wind park in Denmark.In the sea near the coast, there is enough space to erect a large number of wind turbines for electrical power generation. Because there is also more wind at sea, around 50% more energy is produced than on land. One problem is the transmission of the electrical energy to the power grid on land. If the modern technology of high-voltage direct-current (HVDC) transmission via marine cable is used, transmission losses are minimal. Information and ideas:How are offshore wind parks different from those on land? What are the advantages and disadvantages? What hurdles have to be overcome, for example, for transfer to the power grid? What ecological consequences could occur%

Anderer Ressourcentyp

Siemens Stiftung

Run-of-river power plant

Simulation:Operating principle of a run-of-river power plant A run-of-river power plant is used on rivers with a very small fall in elevation and a high flow rate of water. The turbines operate nonstop, meaning they can produce electric power continuously and have very low operating costs. The river water flows through a turbine, which drives a generator, thus producing electricity. An effective head of a few meters is sufficient for run-of-river power plants, but the pressure difference is low. That’s why Kaplan turbines are often used as tubular turbines (horizontal installation) in these cases. They sometimes also have high-speed gearboxes (pit turbines).