The world has thrown itself into the arms of renewables to meet the goals of decarbonization. Each country is developing its strategy And, if in some the photovoltaic takes the lead, in others it is the wind that splits the cod. The problem is the commitments: fill the plate field implies that crops receive less sunlight. And fill the world with wind turbines – apart from visual impact, for fishing and for the birds-, is causing something as curious as it is problematic.
Countries that are stealing the wind from their neighbors.
Wake effect. When the wind hits the wind turbine bladesthese rotate, generating kinetic energy and electricity. The wind continues its path, but after passing through a wind turbine, it does so with less force. Multiply that by fields full of these mills and we have what is known as the ‘wake effect‘ or ‘wake effect’.
This air that has already passed through a wind turbine station does so with a lower speed and greater turbulence. And if this is important, it is because the wind takes time to recover: the wakes can extend more than 100 kilometers after crossing a field of windmills.
wind thieves. These facilities are usually far from each other to better take advantage of the currents, but if under certain circumstances they extend tens of kilometers, and up to the aforementioned hundred, imagine the consequences for the wind turbines that remain behind that installation that receives the first “hit” of wind.
It is not an assumption: there is measurements by SAR satellite that confirm that, if a wind farm is built upwind of another, the wind speed it receives is 9% lower, causing it to have a reduction between 10% and 20% compared to that first installation. This is what is known as “wind theft,” a colloquial term for something that is easy to understand, but not so easy to fix.
This GIF of The Telegraph illustrates it perfectly:
Princess Elisabeth. As we read in BBCthe lawyer Eirik Finseras, specialized in offshore wind energy, “is a somewhat misleading term because you cannot steal something that you cannot own. Nobody owns the wind” – del Sol, yes, a Galician -. But of course, the fact that no one owns the wind does not exempt that park on the windward side from suffering the effects of the park built on the leeward side. In the North Sea, this is already becoming a problembecause the denser and larger the wind farm, the more intense the wake effect will be.
Belgium is building Princess Elisabeth, a huge park that will add a whopping 3.5 GW of offshore wind capacity to the country’s accounts. It is a really huge offshore facilitybut although it will allow the addition of those 3.5 GW, it will also affect the existing Belgian parks due to a wake that will extend 55 kilometers beyond the installation. According to the accounts of the University of Leuven, the oldest Belgian facilities located to the east will experience:
- An 8.5% reduction in annual electricity production.
- Losses of up to 15% on very windy days.
Impact. That in Belgian parks, but of course, it is also an international problem because the wind does not understand borders. By 2030, it is estimated that the current capacity of offshore wind energy in the North Sea will triple. This implies that thousands of turbines will be erected in a very short time with Belgium, Germany, Denmark and the Netherlands willing to obtain, in total, 65 GW of offshore wind energy.
The problem is knowing what will happen to these trails, since it is estimated that the 1,400 MW installation in the Dutch area of Borssele will cause a reduction of 2.7% on average in some Belgian wind farms. It is a very clear case of how the Netherlands is “stealing” the wind from Belgium.
It is logical to understand the interest in offshore wind
Bigger blades. In a report by BBCPablo Ouro, a civil engineering researcher at the University of Manchester, points out that they have been seeing wake effects for years, but that “the problem is that, to achieve emissions neutrality, we will need to triple offshore wind capacity and some of these new turbines will operate very close to those already in operation. There will be more and more crowds and the wake effects will have a greater impact.”
And it is no longer a question of the number of mills, but of their dimensions. In the North Sea we are seeing efforts to achieve both greater heights for the mills themselves (to take advantage of other currents that are not being taken advantage of right now, such as larger blades that receive even more force from the wind. They are imposing mega-constructions that will also affect this wake effect, aggravating the problem.
Solutions? Different countries are doing calculations. For example, in the United States, esteem that the planned offshore wind farms will produce a devastating wake effect: losses in the annual electricity production of other farms by up to 48.5 TWh per year. And there are already accusations: the Netherlands says that Belgium takes advantage of its wind, Germany says that the Netherlands is harming them… and the United Kingdom’s offshore parks stealing wind each other.
The solution? Nothing simple, especially when many of these parks have either already been built or are under construction, but even so, research is being carried out to optimize the facilities. For example, adjusting turbine angles and optimizing the space between them, manufacturing higher power turbines to produce more with less or creating buffer zones between parks
And, perhaps, the most difficult thing: that countries cooperate to carry out joint studies to place their facilities in the most efficient way for everyone.
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