Offshore oil and gas platforms require a constant power supply and decarbonizing this power is a top priority. A case study with Lundin Energy Norway has shown that wave power is highly competitive with offshore wind power, both in terms of levelized energy cost and in providing a more stable power supply that does not requires only half power balancing.

To assess the oil and gas platform sizing and power balancing requirements, a one-year time series with sea state data was analyzed. A design for a 100 MW wave farm has been developed for on- and off-grid installations. The output power profile was compared to the output power profile of an equivalent wind farm and to wind data for the same location and time period. The more constant nature of the waves was evident and the wave energy provided a much more stable power output.

An off-grid wave farm installation required only half the amount of energy storage compared to the wind farm, both in terms of power and energy as well as energy going through the storage. The cost of balancing the power produced is therefore halved with wave energy, reducing both the cost of the energy storage system and the loss of electricity produced when using the wave energy. ‘energy.

Hydrogen has been identified as the most viable solution for long-term seasonal balancing in an off-grid facility, due to the large amounts of storage required. It can also be noted that the use of depleted gas fields to provide hydrogen storage is seen as an attractive opportunity for oil and gas companies to continue to generate value from these assets.

“In addition to the very promising results of this case study, it also allowed Ocean Harvesting to develop a comprehensive network and system design, handling plan and life cycle cost assessment for a 100-meter wave farm. MW, all of which will be very valuable moving forward to sea trials and commercialization,” says Mikael Sidenmark, CEO.

About wave energy

The estimated global theoretical potential of wave energy1 exceeds the world’s electricity consumption and is available in coastal areas where most of the population lives. Wave energy generates electricity more consistently and at different times compared to wind and solar power and therefore helps to compensate for intermittency, thereby reducing the total cost of carbon-free electricity. In addition, wave power only needs half the amount of energy storage to balance power generation at constant output throughout the year compared to wind power, which which further reduces the total cost of energy. Wave energy will be an important part of the future renewable energy mix, contributing to both lower energy costs and a more stable energy system.

About Ocean Harvesting and InfinityWEC

Ocean Harvesting is privately held with offices in Karlskrona and Gothenburg, Sweden. After years of research in the wave energy sector, the company started in 2017 to develop the InfinityWEC wave energy converter.

InfinityWEC is:

  • Efficient – Revolutionary PTO ensuring maximum power output with every wave.
  • Reliable – Hold the buoy submerged through the crest of large waves to ensure survivability and allow continuous power generation even in the toughest wave conditions.
  • Scalable – Proven subsystems, produced, assembled and installed efficiently, enabling large-scale deployment. Highly recyclable.
  • Ideal partner for Wind & Solar – Generate electricity at different times, improve the balance between electricity supply and demand. Shared infrastructure and operational costs.
  • Low levelized cost of energy (LCOE) – Estimated at 100 EUR/MWh for a deployed capacity of 100 MW and

What makes InfinityWEC so competitive is the advanced PTO system, which uses a combination of ball screw actuators and a hydraulic pre-tension system to provide instant control of the force applied to the buoy to control its movement (phase control) and capture. energy. This allows reactive force control to be used to maximize the power output of each individual wave, which can provide up to 30% more annual power output, compared to equivalent force control which does not is set only to sea state. A unique survival feature keeps the buoy submerged through the crest of large waves, protecting the system from excessive loading and allowing power to be generated even in the harshest conditions. most severe waves.

InfinityWEC is designed for sustainable large-scale production and efficient logistics. The PTO uses proven subsystems. InfinityWEC’s main engine (buoy) is made of concrete poured with locally sourced materials at the installation site using a common civil engineering process, minimizing transportation. A special high-strength and durable concrete mix is ​​being developed in conjunction with Sweden’s RISE research institutes, enabling a main engine with a weight equivalent to a conventional steel hull, but at 1/4 the cost, a 1/3 of the CO2 footprint, and which is 10 times faster to manufacture. Excellent performance and reliability, combined with a modular design where all critical parts are easily manufactured, transported, installed and maintained, make InfinityWEC a very competitive solution for the future global energy market. InfinityWEC’s market ranges from large-scale wave farms for electricity and hydrogen generation to gas and grid power on the mainland, to off-grid power supply for island communities and other facilities offshore industries such as oil and gas platforms and aquaculture. Learn more:

Source and top image: Ocean Harvesting


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