Ocean waves are not only useful for surfers, but can also be a powerful source of clean energy. This energy, known as wave energy, is generated by taking advantage of the movement of the waves to produce electricity wave energy is a renewable energy source that can be used to generate electricity using different technologies. Although it is still an expensive option with few large-scale commercial projects, its potential is enormous, especially for coastal areas with constant waves. Today, its application is still limited, but new research and technological advances are positioning wave energy as a key alternative within the renewable energy mix.
What is wave energy?
Wave energy, also known as wave energyIs a renewable energy which takes advantage of the movement of ocean waves to generate electricity. This conversion of the kinetic energy of waves into electrical energy is carried out using different technologies, some already in the experimental or commercial phase. The term “undimotriz” comes from the Latin “unda”, which means wave or pulse, and “motus”, which refers to movement. It is one of the many ways in which we can take advantage of the inexhaustible energy ocean potential to generate renewable energy without emissions polluting gases such as greenhouse gases.
How wave energy works
There are different methods for harnessing wave energy, but in general the process involves capturing the kinetic energy of wave motion and transforming it through devices that drive electric generators.
Technologies in development
Today, there are three main technologies for electricity generation from wave motion:
- Buoys: One of the most widely used technologies is the floating buoy system. These buoys rise and fall with the waves, generating energy through a vertical movement which drives pistons connected to electric generators. In Spain, there are already projects of this technology, such as the one developed by Iberdrola in Cantabria.
- Oscillating water column: This technology consists of a submerged structure that works on the principle of air pressure. When water rises through the column, the air is forced through a turbine that generates energy. When the water goes down, the air flows again, making the turbine spin again. This system is being implemented at the plant Mutriku, Basque Country.
- Wave energy converters:These devices capture wave energy and convert it into mechanical motion which is then converted into electricity. Some test projects are underway in the United States and Chile, as well as in Europe.
Each of these technologies has its own advantages and limitations, but they all point towards the sustainable electricity production from a highly predictable source: ocean waves.
Wave energy projects in Spain
In Spain, wave energy has a great potential due to its more than 8.000 km of coastline. Although the commercial development of wave energy is still in its early stages, several pilot projects have emerged that seek to explore this renewable source.
The Cantabria plant
One of the main projects in Spanish territory is the one developed by Iberdrola on the coast of Cantabria. They have settled there 10 buoys at depths of 40 metres and distances of between 1,5 and 3 kilometres from the coast. These buoys, with a power of 1,5 MW Each one generates electricity through the vertical movement of waves, winding and unwinding cables connected to generators. This project stands out not only for its innovative technology, but also for its low environmental impact and its durability.
Mutriku: a pioneer plant
Located in the Basque Country, the plant mutriku It is one of the first wave energy installations in Spain and the world. It uses the oscillating water column technology described above, and has been a key project in the research and development of this technology. In addition, it has achieved important milestones, such as generating more than one gigawatt hour since its implementation in 2011.
Advantages and disadvantages of wave energy
Wave energy presents a series of and advantages that make it attractive, but it also faces significant challenges that need to be addressed for its large-scale implementation.
Advantages
- Inexhaustible resource: Unlike fossil fuels, ocean waves are constantly moving, ensuring an inexhaustible source of energy.
- Low environmental impact: Being a clean energy source, wave energy does not emit greenhouse gases or other atmospheric pollutants.
- Predictability: Ocean waves and ocean currents are highly predictable phenomena, which facilitates the planning of energy production.
Disadvantages
- high costsWave energy technologies are not yet fully developed, which makes their installation and maintenance costs high.
- Resistance to extreme conditions: The structures used must be robust enough to support extreme waves and adverse weather events.
The future of wave energy
The potential of wave energy is enormous. According to the International Renewable Energy Agency (IRENA), this technology could generate around 100,000 tonnes of electricity. 29.500 TWh per year, an amount sufficient to meet global energy demand. However, this ambitious goal faces several technological and financial challenges that will need to be overcome.
Many countries, including Spain, Portugal, Scotland y Chile, are already investing in marine energy and innovative technologies that can make its exploitation feasible on a large scale. The project EuropeWave, an alliance between Spain and Scotland, seeks to boost wave energy by funding experimental devices and creating a market that allows these technologies to evolve rapidly.
A future in which wave energy It is possible that renewable energy can become one of the main sources of energy. However, it will be crucial to continue advancing in the development of better technologies and economic models that will allow this energy to reach the global market.