Wave energy pros and cons
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Ocean waves exert tremendous amounts of power - power which can be utilized as a renewable resource known as wave energy, or tidal energy. The United States has the potential to generate 2.64 trillion kilowatt hours of ocean energy - or more than half of the energy generated within the U.S. in 2018.
If we had the potential to generate more than half of the U.S. electricity from waves, what is hampering the utilization of wave energy?
In this article, we will take a deeper look at the pros and cons of wave energy and what makes wave energy power plants challenging to implement.
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The easiest way to think about it is this: a wave’s force powers underwater turbines that are attached to a buoy. The turbines then spin from the force of water and generate electricity.
Wave energy produces electricity using naturally occurring forces of water within the ocean. Waves are incredibly powerful and wave energy plants harness this power by utilizing the steps within the infographic below.
The buoys at the bottom right serve as a water intake system. The water then rushes up to a generator equipped with turbines, or wave energy converters (WEC), that spin when moving water hits them. The movement of the WECs is what generates electricity. This electricity is then sent to the grid via power lines.
Hydropower, on the other hand, uses the flow of moving water to directly push a turbine that is connected to a generator and creates electricity. In fact, the only thing that wave energy and hydropower share is the fact that they are both powered by the forces of water.
Learn more: Hydropower pros and cons
Wave energy has huge potential but it is very challenging to harness because of the nature of seawater - it is corrosive and its movements change often.
However, currently there aren’t any large-scale wave energy plants in use. There are only very small ones, which are mostly being used for research on how to best capture wave energy.
Inherently, wave energy does not emit greenhouse gasses when generated, like fossil fuels do.
Turbines generate electricity through the power of waves, making it a completely pollution-free, renewable energy source.
If we can get the technology right, tidal power can be a huge part of the green energy mix, complementing solar power, wind turbines, geothermal, and hydropower.
Like all alternative energy sources, wave power is renewable.
Waves are created by wind, and wind is caused by uneven heat on the planet's surface driven mostly by the sun warming different locations at different rates.
Wind moves heat energy from one part of the planet to another, which causes waves to form. Because wind will always exist, waves will always be available at the surface of the water to generate electricity, making this a renewable source.
The amount of kinetic energy that is exerted in a wave is huge - that energy then gets captured by wave energy converters to produce electricity.
For example, an average 4-foot, 10-second wave can put out 35,000 horsepower per mile of coast. The ocean provides a lot of potential for energy production because it is constantly moving and generating energy.
There is also a lot of potential because many countries have access to an ocean that can help power their electric grids.
Waves are hardly interrupted and almost always in motion. This makes electricity generation from wave energy a more reliable energy source compared to wind power, since wind is not constantly blowing.
It should be noted that the amount of energy that is being transported through waves does vary every year, and from season to season. Generally, waves are more active in the winter because of the increased wind, which is due to colder temperatures.
Because wave energy is still in its infancy, mostly in research, there is no measure of the environmental effects of large-scale power stations on the shore.
Building plants or electrical wires directly on the beach might prove challenging because they would be unsightly and can cause damage to marine life and the surrounding ecosystems.
Local fishing zones could be affected or the plants could lead to more coastal corrosion. However, more research is needed to determine the true environmental impacts that wave energy plants could cause.
Wave power is an emerging energy technology in the early stages of development, making speculating on costs difficult.
Wave energy systems have the potential to be as cheap as $1.09 per kWh to build, but will depend on location and maintenance costs. However, at the moment, the costs of wave power are generally very high because they are in the research phase of development and generally paid for by government grants or research grants. There are no energy companies utilizing wave energy at scale - something which would bring the cost down.
Maintenance for these plants is projected to be very expensive because they will be submerged in constantly-moving salt water. Because constant movement can lead to more breaking, wave energy plants will most likely need regular (and costly) maintenance.
Perhaps the biggest con at the moment is that no utility has the ability to install wave farms because they are not yet large enough to provide a significant amount of electricity.
While some wave energy systems have been tested in Scotland, Hawaii and most recently, Australia, their power generation capacity is only about 2.5MW at their peak. The industry is expected to grow, but it remains challenging to implement wave energy generators at a usable scale.
For many ocean-bordering countries, wave energy could be a great addition to the renewable energy mix.
Waves would provide 24/7 energy that could be harnessed for clean electricity generation. Because wave energy is still in its early stages, it remains expensive to install and the potential environmental disadvantages are not yet fully known.
The bottom line is that wave power has enormous global potential. However, the industry needs more funding and research to finalize the technology involved so that countries and utilities can begin adding wave energy to their renewable energy arsenal.
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