Influence of offshore wind turbine size in levelised cost of energy
I. Arrambide Department of Electrical Engineering, Escuela de Ingeniería de Guipúzcoa, University of the Basque Country, Donostia-San Sebastián (Spain) 2026-01-20

Abstract

Offshore wind energy is developing rapidly in recent years. Within the offshore wind energy industry, the main advance that has occurred has been the wind turbine growth. In fact, the offshore turbines have changed from small turbines adapted to the marine environment to turbines that currently range between 16~18 MW. This increase has been done in order to cut down costs and get longer production of wind energy, consequently, reducing the levelized cost of energy.

The current mechanisms for assigning marine sites are based on successive auctions organized by government agencies. In some countries, these auctions are carried out through reverse bidding, that is, they are awarded to the promoters who present the lowest sales price for the energy generated or, in the case of other countries, that price marked in the auction has a partial weight of 60%~80% in the final ranking. Other countries organize a second type of reverse auction to award subsidies, which, being limited, are awarded to the promoters who present the lowest energy sales price.

In this article, a comparative study developed for evaluation of the value of levelized cost of energy, as a result of bigger nameplate capacity of the offshore wind turbines. The results show that the bigger turbine capacity, the lower the levelized cost of energy is obtained.

Key words: Offshore wind, LCoE, wind turbines, energy cost evaluation

References

[1] 4COffshore. Offshore Wind Farms Database. Available: https://www.4coffshore.com/

[2] DNV Report. “Energy Transition Outlook 2022. A global and regional forecast to 2050”. 2022.

[3] Clarksons Report. “Focus on China's Offshore Wind Power Market”. June 2022.

[4] “Scaling up the use of offshore wind turbines”. Available: https://www.siemensgamesa.com/en-int/products-and-services/offshore

[5] “Offshore wind turbines”. Available: https://www.vestas.com/en/products/offshore

[6] “Haliade X offshore wind turbine”. Available: https://www.gevernova.com/wind-power/offshore-wind/haliade-x-offshore-turbine

[7] “Statistics of new offshore wind power models in China in 2023 released” Press note. February 2024. Available: https://news.bjx.com.cn/html/20240228/1363221.shtml

[8] Y. Saint-Drenan, R. Besseau, M. Jansen, I. Staffell, A. Troccoli, L. Dubus, J. Schmidt, K. Gruer, S. Simões, S. Heier “A parametric model for wind turbine power curves incorporating environmental conditions” Renewable Energy Vol. 157, September 2020, pp. 754-768. https://doi.org/10.1016/j.renene.2020.04.123

[9] J. Dai, D. Liu, L. Wen, X. Long. “Research on power coefficient of wind turbines based on SCADA data”. Renewable Energy 86, 2016, pp. 206-215.

[10] J. Bleeg, M. Purcell, R. Ruisi, E. Traiger. “Wind Farm Blockage and the Consequences of Neglecting Its Impact on Energy Production” Energies 2018, 11, 1609. doi: 10.3390/en11061609

[11] IEC 60287 Calculation of the current rating - Part 1: Current rating equations (100 % load factor) and calculations of losses.

[12] I. Arrambide, I. Zubia, A. Madariaga, “Re-optimizing array cable systems in offshore wind farms using 66 kV voltage”, in Proc. Int. Conf. Renewable Energies Power Quality, Granada, Spain, 2020, pp 48-52 https://doi.org/10.24084/repqj18.212

[13] Cigré Working Group WG B1.10 “Update of service experience of HV underground and submarine cable systems”, Reference TB 379 Technical Brochure, Paris, France, 2009.

[14] BVG Associates, “Guide to an offshore wind farm” UK, January 2019.

[15] M. Dicorato, G. Forte, M. Pisani, M. Trovato. “Guidelines for assessment of investment cost for offshore wind generation” Renew. Energy, 36 (8) (2011), pp. 2043–2051.

[16] A. P. Neumann, M. J. Mulroy, C. Ebden. “The use of 66 kV tchnology for Offshore Wind demonstration sites” 3rd Renewable Power Generation Conference (RPG 2014), 2014, pp. 1-6, doi: 10.1049/cp.2014.0832

[17] K. E. Thomsen “Offshore Wind. A Comprehensive Guide to Successful Offshore WindFarm Installation” Academic Press. 2012. ISBN: 978-0-12-385936-5

[18] GL Garrad Hassan, 2013 “A Guide to UK Offshore Wind Operations and Maintenance”, Scottish Enterprise and The Crown Estate.