What Advances Are There in Tidal Stream Generators for Renewable Energy?

Harnessing renewable energy from various resources is imperative in this era of climate change. Among the diverse sources available, tidal energy has been gaining momentum as a promising alternative. This piece aims to shed light on the latest advancements in tidal energy, particularly focusing on tidal stream generators.

Through this article, you will gain a better understanding of tidal energy generation, the technology behind tidal stream generators, their strengths and weaknesses, and how they compare with other renewable energy sources like wind and solar power.

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The Basics of Tidal Energy

Before delving into the specifics of tidal stream generators, let’s first ground ourselves with some background knowledge on tidal energy. Tidal energy is a form of hydro power that converts the energy from tides into electricity or other useful forms of power. The key advantage of tidal energy is its predictability. Unlike wind or solar power, tides are not subject to weather conditions or daylight hours.

Two main technologies are commonly used in tidal energy generation: tidal range systems and tidal stream systems. Both utilize turbines to convert energy from water flow into electricity. However, they differ in the way they capture and use the tidal energy.

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Tidal range systems use barrages or lagoons to capture the potential energy in the difference in height (or head) between high and low tides. In contrast, tidal stream systems extract kinetic energy directly from the tidal current, similar to a wind turbine.

Tidal Stream Generators

Tidal stream generators are an emerging technology for harnessing tidal energy. They use the kinetic energy of moving water to power turbines, which then generate electricity. Unlike tidal barrages, tidal stream generators do not require large dams or reservoirs, making them more environmentally friendly and cost-effective.

The working principle of tidal stream generators is simple: As the tide flows, it moves the turbine blades, which are connected to a generator. The generator then converts the mechanical energy into electrical energy. The design of the turbine is crucial to the efficiency of energy generation.

Recent advancements in turbine technology have improved the efficiency and reliability of tidal stream generators. For example, improvements in blade design have enhanced the ability of turbines to capture energy from water flow, while advancements in materials have increased the durability of the turbines in harsh marine conditions.

Comparison with Other Renewable Energy Technologies

When compared with other renewable energy technologies, tidal stream generators bring several distinct advantages. First, they generate electricity constantly as they harness the energy from the predictable movement of tides. This is a significant advantage over wind and solar power, which are intermittent and depend on weather conditions.

Second, tidal energy is highly efficient. Water is roughly 800 times denser than air, so even a slow-moving tide can generate significant energy. In fact, a tidal turbine can extract up to 80% of the energy in a tidal stream, while a good wind turbine can only extract about 50% of the energy in the wind.

However, tidal stream generators also face challenges. The marine environment is harsh and corrosive, which can reduce the lifespan of the turbines. Also, the energy density of tidal streams varies greatly with the depth and speed of the water, which can make the planning and installation of tidal stream generators challenging.

The Future of Tidal Stream Generators

Despite these hurdles, the future of tidal stream generators looks promising. Research and development in this area are rapidly advancing, with new materials and designs being tested to improve the efficiency and durability of the turbines.

One of the promising technologies is the floating tidal stream generator. Unlike conventional tidal stream generators which are fixed to the seabed, floating tidal stream generators can be deployed in deeper waters where the tidal stream is stronger. This opens up a much larger potential for tidal energy generation.

Also, advancements in digital technology are improving the monitoring and control of tidal stream generators. For example, real-time data analysis can optimize the operation of the turbines and predictive maintenance can reduce the downtime of the generators.

In conclusion, tidal energy, particularly from tidal stream generators, holds great potential for renewable energy generation. With ongoing advancements in technology and an increasing awareness of the importance of clean energy, tidal power is set to play a more significant role in the future energy mix.

The Evolution of Tidal Stream Generators

The journey of tidal stream generators in harnessing tidal energy has been evolutionary. With successive generations, these devices have become more efficient and sustainable. The initial design of tidal stream generators was based on horizontal axis turbines, mimicking the design of wind turbines. However, it soon became evident that this design was not optimal for underwater conditions because of the greater density and slower speed of water compared to air.

As a result, vertical axis tidal turbines were developed. These turbines are more flexible as they can capture the tidal current from any direction and do not need to be oriented in the direction of the current. This makes them more effective in harnessing the power of irregular and unpredictable tidal currents.

Moreover, the use of advanced materials like composite materials and stainless steel has greatly increased the longevity of tidal turbines. These materials are resistant to the corrosive effects of sea water, reducing maintenance costs and downtime.

In addition, engineers have leveraged google scholar and scholar crossref databases to access a wealth of research on tidal power generation. This has led to the development of innovative designs like helical turbines and biomimicry designs inspired by the natural movements of marine organisms such as fish and sea plants.

The Impact on Renewable Energy Sector

Tidal stream generators are poised to have a transformative impact on the renewable energy sector. They can substantially contribute to the overall energy mix, reducing the reliance on fossil fuels and helping to mitigate climate change.

Unlike other forms of renewable energy, tidal power is reliable and predictable. Tidal currents follow a well-known cycle that is influenced by the gravitational pull of the moon and sun, so power generation from tidal energy is not subject to the same variability as solar and wind power.

Moreover, tidal power has a smaller environmental footprint than other forms of renewable energy. Tidal stream generators, in particular, do not require large structures like dams or barrages that can disrupt marine ecosystems. They are also often submerged, reducing their visual impact.

Furthermore, the energy density of water is significantly higher than that of air. Therefore, tidal turbines, even when operating at lower speeds, can generate a significant amount of power. This makes them a more efficient method of energy harvesting.


In conclusion, the future of tidal energy is bright with the continuous advancements in tidal stream generators. Through improved designs and materials, these generators are becoming more efficient, reliable, and sustainable. Furthermore, the predictability and efficiency of tidal power give it a unique advantage over other renewable energy sources.

Research and development in tidal power are rapidly progressing, and the sector is poised to become more significant in the future energy mix. As with all renewable energy sources, the goal is to harness energy in a way that is clean, sustainable, and reduces our reliance on fossil fuels. In this regard, tidal power, particularly power harnessed by tidal stream generators, is a step in the right direction. As we continue to innovate and refine this technology, the dream of a sustainable energy future becomes ever more feasible.

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