FAQ

FAQ - about wave energy

Who invented wave energy?

By the end of the 18th. century, the idea of harvesting energy from the waves was born i France. But it was not until the 1970´s, that the development of wave energy really took off. It is impossible to name a specific inventor for wave energy as a whole, but the different concepts that make up wave energy today, is possible to ascribe centain individuals. In the case of Crestwing, Henning Pilgaard is the inventor of the actual "crest wing".

What is the price of wave energy?

»When we have installed 100 MW - or 20 plants - then we are in business, and will have no trouble producing electricity at 30-45 øre pr. kwh, if it is deployed in the Atlantic ocean. In Denmark, it would be on par with offshore-vind, meaning 60 øre pr. kwh. We need help in getting the first 10-20 devices installed.« quote Hans Christian Sørensen. Source: Ingeniøren ING.DK

What is wave energy?

Wave energy is the harvesting of energy, from the motions of the waves of the ocean. The motions of the waves drives a small or larger generator. The transformation of power to electricity, has over time, been presented in many forms and with different relevant factors. Listing Oscillating Water Columns (OWC plants), turbine or fan-systems, overtopping systems, floater/pump-systems and more.

Where is wave energy usefull?

Every country with a coastline can make good use of wave energy in their mix of renewable energy. Many nations around the globe has promising projects. Denmark being one of them, despite the possibilities to get subsidies having deminished over the last few years.

How widespread is wave energy?

Since the late 70´s, following the oil crisis, the transistion to green and renewable energy has been a hot topic. Wave energy is normally seen as the akward cousin of wind energy, and there is certainly a connection between the two. Wind energy has matured over the last 50 years and wave energy was bound to go through the same phase. In 2017, the world has yet to see commercial wave energy projects. At Crestwing, we believe we may have cracked the code, thus having the potential to change all that.

Why wave energy?

Because the goal is to become fossilfree and base our power needs on 100% renewable energy globally. We will only reach this goal if the different types of technology within sustainable energy work together. It means a mix of solar, wind, waves and other green technology, if we want to meet the growing demands of energy on the globe.

Wave energy, how does it work?

Energy kan be converted from one state to another, but cannot be created or destroyed. Any wave energy converter aims to convert the energi from the waves into electricty with a minimal loss.

How is wave energy created?

When the wind blows, some of that energy makes ripples on the surface of the water and in essence "creates" the waves.  Without wind, there would be no waves. Water is over 800 times more dense than air, and therefore it will potentailly contain 800 times more energy.

How is wave energy used?

The motion of the waves runs a generator, the power is sent ashore through seacables, and is fed into the grid, just like with solar or wind energy. The question that remains is the storing of the energy. If the distance to shore is too great, it would make sense to convert the energy into hydrogen as an alternative to storing the energy in conventional batteries.

How is wave energy harvested?

Wave energy is harvested when the motions of the waves runs a generator. The kinetic energy from the horizontal movement and the potential energy from the vertical movement. Most concepts focus on harvesting one of these motions, but Crestwings concept seeks to take advantage of both. The amount of energy is determined by the wave height, the wave length, the speed of the wave and the density. In general, it is thought to be the push from the wave that should be used to havest the energy. At Crestwing, we have turned it around, and focused on using the atmospheric pressure to create a vacuum. Pulling instead of pushing is also how modern windmills work.