Renewable electricity sources bring lower emissions, but they also have a lot of problems. They are often very dependent on weather fluctuations (wind, sun), so sometimes they produce a lot of electricity, other times a little. This also means that with their increasing share, the electricity grid could suffer from more pronounced fluctuations, which is definitely an unwanted situation. Therefore, in times of excess energy, it is necessary to temporarily store this energy and, conversely, to use it in lack. Although many people imagine this accumulation only in the form of accumulators that are not exactly ecological, cheap and durable, there are dozens of storage methods (flywheels, pumping dams, caves / compressed air vessels, (super) condensers, hydrogen and many others) . Gravity can also be used for storage, which is the case with the above-mentioned pumping dams as well as the project Gravitricity.
It works on a relatively simple principle. When there is enough electricity, the system uses electricity to pull very heavy weights up. When it is low, electricity is produced back by dropping the weights down. Electricity is thus stored in the form of potential energy. The Gravity System should have efficiency between 80 and 90%, which in the above list belongs rather to the above average.
The advantage is that it is a very environmentally friendly method (definitely true compared to batteries), long life in decades without reducing the efficiency or amount of storable energy over time (again, the difference from batteries, where capacity decreases over time) . It also has a relatively fast start-up, it reaches full power from zero in a second and the available power can be regulated by the release speed. It is also a relatively inexpensive solution. He just needs a good height to work. And it is for this reason that the former deep mines are best suited for the construction of these systems. This is also the reason why the first such system (not counting a test project in Edinburgh at a height of only 15 meters with a 25 tonne weight to verify the concept) could stand in a former coal mine in Old men near Frýdek-Místek.
Gravitricity has already negotiated with DIAMO and VŠB – Technical University of Ostrava. The decision on where this repository will be located should be made at the beginning of next year. It is said that it could be up to 8MW system (it was not said how many MWh it will have, but it can be assumed around 12-20 MWh). The blocks, which are lowered and lowered, weigh 500 tons, and the system can stack several pieces in one shaft, which then do not have to hang on the surface, but can be stored. One unit can allegedly mean up to 2 MWh of energy, and it is anticipated that multi-weight systems could store up to 25 MWh of energy in this way.
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Source: Svět hardware by www.svethardware.cz.
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