Why does one wind turbines not directly into a water basin, which is part of a pumped storage power plant? Exactly this technique is now successfully close to Stuttgart. There is a very interesting energy storage in the building.
The Baden-Württemberg town Gaildorf in Stuttgart which dares there is a powerhouse that generates its energy with wind turbines and can store excess electricity using large water reservoirs. Framework of a pilot project was funded by the German Federal Government. Developed solution will be copied across the country.
The power produced by the four wind turbines flows usually equal in Gaildorf electricity, to power the 12,000 inhabitants. There is a slowdown, are used the integrated power storage water-based: from higher elevations basin water flows in a basin situated below and it drives turbines. The water is pumped back once the wind turbines to produce more electricity.
New on this pumped storage station of Ulmer MBS natural power GmbH: the upper reservoirs are located directly on the foundations of wind turbines. This saves lots of excavation, emissions, work and money. Also, the intervention in the landscape is low.
Huge wind turbines stand in the huge water deposit
To see the Gaildorf project is not however: the four turbines of the Spanish manufacturer Gamesa, Siemens also is include with a hub height of 173 m and a rotor diameter of 137 m to the world’s largest – in any case, according to today’s State. Them to go end of 2017 to the network.
With an output of each 3.4 megawatts at an average wind speed of 6.4 meters per second, come the plant at about 2,200 full-load hours to 40 gigawatt hours a year, estimates the magazine technology review.
However, the concept to build the water storage at the foot of the wind turbines is particularly unusual. The integrated into the Foundation, completed pool 16.6 meters in diameter and up to 40 m high which varies depending on the location of each gangplank. Trappings are open basin are built from 63 m diameter and 4 m deep, so-called passive water basin. Total 160,000 cubic meters hold water here.
The pressure pipe is welded directly on-site
If necessary, the water runs through a 5 km long and 2 m thick pressure pipe into the Valley, where 200 meters deeper from a 300 x 150 m deep it large and 4.5 m pool is captured. To reduce the burden on the landscape, the pipe had to be adapted to the conditions, withstand up to 30 bar and still blow up the financial framework. The solution: a flexible polyethylene pipe, which brought 18 m into the forest in parts and welded in place. 2018, everything should be finished.
Water under full load rushes through, generate the turbines of the Heidenheim-based Voith group from the amount of stored water 70 MWh electricity. The water is enough for four hours of electricity. It takes only a half a minute to go to up the power station ideal for an energy buffer.
Whatsoever yield of 6.5 million euros in the year
The project cost is 70 million euro, of which the Federal Environment Ministry is 7.15 million euros. The builders expect earnings of 6.5 million euros per year. Another project, also in Gaildorf, has already announced the natural GmbH: you could install a natural heat storage In the basin – water is available there eventually anyway, and at any time.
It is a floating heat exchange, which use the temperature of the surrounding water for heating or cooling purposes. A decision is still pending.
An also unusual, but quite another approach Belgium. Now, lack mountains wants to build the country a granary island in the middle of the sea. North Rhine-Westphalia, however, reflects on its mines as energy storage. This suited to the part as pumped storage.