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Dynamic cables – opening up new markets in offshore wind development

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Dynamic cables – opening up new markets in offshore wind development

Did you know that 80% of the total ocean space is too deep for conventional offshore wind farms?

As wind energy takes on a greater role in providing sustainable electricity to millions, harnessing stronger and more consistent winds found farther offshore is critical. In recent years, advancements in high-voltage (HV) dynamic cables, critical to transporting energy back to land, are opening up new opportunities for offshore commercial wind power.

Harnessing wind power in areas previously impossible

A vast, untapped potential lies in harnessing offshore wind power. Although fixed-bottom wind projects currently lead offshore generation, nearly 80% of the world’s offshore wind potential is in waters deeper than 60 meters. This offers a tremendous challenge for the electrical transmission industry.

Yet, during the past thirty years, offshore wind has played an essential role in the decarbonization of energy. According to McKinsey, the growth of offshore wind capacity is projected to reach 630 gigawatts (GW) by 2050, up from 40 GW in 2020.

Since deeper waters are common along most coastlines worldwide, floating offshore wind turbines are crucial for these regions to harness offshore wind energy. Thus, floating offshore wind offers many countries and regions a viable path to electricity decarbonization. But getting this energy back to shore requires robust HV dynamic cables that can withstand the harsh conditions of the seas.

From sea to shore: How tech breakthroughs are powering up floating wind farms

One of the many advantages of placing wind turbines further out from the shoreline is the sheer power of the winds. More powerful and consistent wind speeds equate to a more reliable energy source.

Turning this powerful wind into sustainable energy is possible in part due to new developments in HV dynamic cables and enhancements in floating wind turbines and substation designs.

And it is thanks to these advances that by the end of the decade, large-scale floating wind farms on the West Coast of the United States, France, and South Korea will finally be a reality.

And we’re already seeing this happen. The first commercial floating wind project to be awarded is in France, off the coast of Southern Brittany. This monumental project will, upon completion, be the largest floating offshore wind farm in the world. The 250 MW site will double Europe’s current floating offshore wind capacity.

However, reaching this milestone requires getting the energy back to land where it can be transmitted and used. And this is where HV dynamic export cables are the critical link. To do that requires cables that can withstand deep-water seas. A feat that has taken years to achieve!

4 differences: Breaking new boundaries in HV dynamic cable design

1. Dynamic vs. static HV subsea cables

2. Water resistance of dynamic cables

3. Design simulation to achieve greater mechanical performances

4. Collaboration between stakeholders is critical to project success

Overcoming new challenges going forward

The oil & gas industry has a long history of using medium voltage (MV) electrical subsea equipment. Today, that same philosophy is being explored for subsea substations. However, HV systems are a different playing field!

Transitioning to HV subsea equipment brings in a lot of additional challenges due to both increased voltage and larger sizes. This generates new challenges for design and handling offshore, combined with even more strict requirements for design tolerances and water tightness.

All HV subsea systems, including cables and potential substations and their connectors, require significant testing and qualification efforts over long time spans. Often, new failure modes arise as we acquire more knowledge about higher-voltage subsea equipment.

When it is possible to install subsea offshore substations or converter stations on the seabed, it will be a game-changer. It will unlock vast new areas for wind energy production, improve efficiency, and contribute significantly to the transition towards a sustainable energy future. For example, this advancement will significantly enhance the cost efficiency of electrical export, ultimately reducing costs and optimizing resources.

Driving the critical link in floating wind power

The largely untapped deep-water areas open up new opportunities for floating wind farms. A key link to the future of floating wind is the vital cables required to transport energy to shore. Nexans is driving innovative cable technologies and design methodologies to further the development of commercial floating wind farms.

A long track record in dynamic hybrid cables is led by the Group’s experience in materials, modeling, and software development. Dynamic power umbilicals & DEH systems experience, combined with its HV subsea cable expertise, this gives a unique combination of design and manufacturing know-how, allowing to simulate, test, qualify, and manufacture HV dynamic cables.

In 2021, Nexans made a major breakthrough by qualifying the first 145 kV dynamic cable for 1300-meter water depth. Selected for the Jansz-lo project, this innovative cable is leading the way for floating offshore wind projects.

Growth of floating wind farms in the years to come

The vast open seas hold great potential in the world’s quest to decarbonize electricity. Floating wind farms, farther out and deeper, will play an increasingly important role in the battle against climate change.

Major advancements in HV dynamic capabilities play a critical role in achieving the commercial success of floating wind farms. Nexans’ groundbreaking 145 kV dynamic cable capable at 1300 meters opens up new opportunities for deep sea projects in harsh water conditions. This innovation is crucial for the future of commercial floating wind farms.

According to an August 2023 Global Wind Energy Council (GWEC) report, the floating wind market will accelerate by the end of the 2020s, with 11 gigawatts (GW) installed by 2030 and 26 GW by 2032.

Starting in 2031, floating wind installations will constitute over 10% of annual offshore wind installations, a notable achievement given the rapid expansion of offshore wind overall.

This growth will significantly contribute to adding decarbonized electricity generation to power grids, supporting global efforts to reduce carbon emissions, and the transition to sustainable energy sources.

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Wind Energy Articles

Türkiye’s 1200 MW Wind Competitions (YEKA-4 RES 2024) Completed in January 2025

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Habib BABACAN General Manager Mature Capital

YEKA is the abbreviation of capital letters of “Yenilenebilir Enerji Kaynak Alanları” which means Renewable Energy Resource Zones.  RES is the abbreviation of capital letters of “Rüzgar Enerji Santrali” which means Wind Energy Power plant. 

Ministry of Energy of Türkiye executes wind tenders for YEKA RES zones since 2017, and so far 2850 MW capacity was tendered in the first three YEKA RES competitions; respectively – 1000 MW in 2017, 1000 MW in 2019, and 850 MW in 2022. Tender eligibility requirements and competition rules were different in all these three tenders. However, the common point for these three tenders, in none of them projects were developed. 

Projects were pre-developed in YEKA-4 RES 2024

YEKA-4 RES 2024 Competition was announced on 28 October 2024 for a connection capacity of 1200 MW in five different projects. Different than before in this tender, the announced projects were pre-developed by Ministry and long-term wind measurements were carried out, site coordinates, and even turbine coordinates are defined, and development data was shared with tender participants.

Here are some highlights for this tender rules are given in below table.

Table 1: Highlights of YEKA 4 RES – 2024 Auction
TopicDetailsExplanation
Capacity Tendered1200 MW– 5 different projects
Pre-Licence Period (for Electricity Generation)24 months– Starts with issuance of Pre-Licence, usually 6 months after the signature of YEKA Agreement
Licence Period (for Electricity Generation)49 years– 49 years after the prelicence period
Local Content Requirement (applied to main components, and some sub components)Minimum 55%– No local nacelle or other factory obligation.
– Supply of selected components should exceed 55% point.
– All locally supplied subcomponents should exceed certain localization ratios.
Electricity Sales with Market RatesFirst 72 months after the signature of YEKA Agreement– This period starts approximately on 31 March 2025 and lasts 72 months.
– This 72 months includes remaining project development activities including permits, design and turbine selection, as well as construction period of wind farm.
– For the winner, earlier completion is better to benefit from electricity market rates.
Competition Electricity Sales – Feed in Tariff & Contribution Fee– First bid shall be given between 5.5 to 3.5 USDCents/kWh.
– Reverse Auction continues until it reaches 3.5 USDCents/kWh.
– After reaching 3.5 USDCents/kWh, auction off for Contribution Fee in USD per MW. Highest Contribution Fee bidder is the winner.
– Feed in tariff (USDCent/kWh) shall continue for 20 years.
– This 20-year period starts 72 months after the signature of YEKA Agreement.
– No annual escalation for the winning bid.- Contribution Fee is in USD per MW, and paid just after the signature date of YEKA Agreement. [Until 31 March 2025]. Winning bid should pay [Contribution Fee X Project Installed Capacity].

Tender Applications

Deadline for YEKA-4 RES 2024 was 21 January 2025, and investors were given around three months of time for preparations. Since Turkish wind market is eager for the developed wind projects, interest from the local investors were high, and 40 different investor groups were applied for the competition. The below table shows number of bidders for each project. Since the investment amount (CAPEX) increases with the capacity, more applicants were seen for smaller capacities. However, even 14 applicants for 410 MW Edirne RES Project were enough for a tough competition.

Table 2: YEKA 4 RES – 2024 Projects & # of Bids
#Project NameProvinceInstalled CapacityNo of Bidders
1R24- EDİRNE RESEDİRNE410 MW14
2R24- BALKAYA RESKIRKLARELİ340 MW16
3R24- SERGEN RESKIRKLARELİ200 MW21
4R24- YELLİCE RESSİVAS160 MW23
5R24- GÜRÜN RESSİVAS90 MW26

Tender Results

In all these five projects tenders, first offers for feed in tariff which were provided within the closed envelopes contains minimum tariff of 3,5 USDcents/kwh. Therefore, reverse auction rounds for feed in tariffs were not carried, tenders directly started with auctioning off Contribution Fee per MW after the opening of closed offers.

Tender rounds for all five projects were very competitive in increasing contribution fees, even after reaching to lowest feed-in tariff of 3,5 USDcent/kwh for 20 years without annual escalation. Table 3 shows results of tender with the winning investors, and auction rounds.

Table 3: YEKA 4 RES – 2024 Results
#Project NameProvinceInstalled CapacityInvestor / Winning BidderFeed-in-Tariff ($cent/kWh)Contribution Fee (USD/MW)Auction Rounds
1R24- EDİRNE RESEDİRNE410 MWENERJİSA ENERJİ ÜRETİM A.Ş.3,50$60.0005th Round
2R24- BALKAYA RESKIRKLARELİ340 MWENERJİSA ENERJİ ÜRETİM A.Ş.3,50$92.0005th Round
3R24- SERGEN RESKIRKLARELİ200 MWRT ENERJİ TURZ. SAN. VE TİC. A.Ş.3,50$140.0008th Round
4R24- YELLİCE RESSİVAS160 MWEFOR HOLDİNG A.Ş.3,50$140.0004th Round
5R24- GÜRÜN RESSİVAS90 MWADY AKDENİZ RÜZGAR EN. ÜR. A.Ş.3,50$148.00011th Round

Next Step for the short term period for YEKA-4 RES 2024

The winning bidder for each project will be invited by the Ministry for the signing of YEKA Agreements, and afterward total contribution fee shall be paid in full amount until 31 March 2025 to EPİIAS which is electricity market operator. Table 4 shows the total contribution fee amount for each project.

Table 4: YEKA 4 RES – 2024 Contribution Fee to be paid until 31 March 2025
#Project NameProvinceInstalled Capacity (MW)Investor / Winning BidderContribution Fee (USD/MW)Total Contribution Fee (USD)
1R24- EDİRNE RESEDİRNE410ENERJİSA ENERJİ ÜRETİM A.Ş.$60.000$24.600.000
2R24- BALKAYA RESKIRKLARELİ340ENERJİSA ENERJİ ÜRETİM A.Ş.$92.000$31.280.000
3R24- SERGEN RESKIRKLARELİ200RT ENERJİ TURZ. SAN. VE TİC. A.Ş.$140.000$28.000.000
4R24- YELLİCE RESSİVAS160EFOR HOLDİNG A.Ş.$140.000$22.400.000
5R24- GÜRÜN RESSİVAS90ADY AKDENİZ RÜZGAR EN. ÜR. A.Ş.$148.000$13.320.000

About Habib Babacan 

Habib Babacan has been working professionally in the Turkish Wind Energy sector since 2008. He continues to provide consultancy services, with his own initiative, Mature Capital, to investors in the fields of Business Development, Project Development, Strategy Formulation and M&A of Projects in the wind business. 

More information about Mature Capital, which focuses on Mergers and Acquisitions of Wind Projects (M&A), is available through the links below.

https://www.maturecapital.com.tr

https://www.linkedin.com/company/mature-capital-m/

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Wind Energy Articles

Physical Climate Risks and Wind Power Investments: A Data-driven Approach

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Güven Fidan Founder - CEO Alkazar-UrClimate

Global investment in renewable energy has undergone significant growth over the past decade. According to the International Renewable Energy Agency (IRENA), the world’s total renewable energy capacity increased from 1,226 GW in 2010 to 2,799 GW in 2020, more than doubling in just ten years (1). This trend highlights the critical role of renewable energy in meeting sustainability and energy security goals, and in mitigating climate change. However, climate change itself, through extreme weather events and shifting environmental conditions, can pose new “physical risks” that wind power and other renewable energy facilities must anticipate and manage. Our company provides data-driven solutions—encompassing climatological, meteorological, and topographical information—to help investors, insurers, and banks address these emerging challenges.

The Physical Risk Landscape

Wind, solar, and hydropower facilities operate under open-air conditions, making them particularly vulnerable to disruptions caused by climate change. Extreme heatwaves, flooding, icing, lightning, and wildfires are among the hazards affecting both the construction and operational phases of renewable energy projects. For example, in colder regions, such as Canada, ice accretion increases maintenance costs. It poses safety risks, whereas, in countries like Türkiye, wildfires and frequent lightning strikes can significantly threaten infrastructure and operational stability.

Our specialized climatological datasets provide valuable insight into current and future risk profiles for any given location. We integrate historical reanalysis data with validated climate projections using advanced numerical algorithms, which enables stakeholders to identify the severity of these risks under different scenarios. This holistic approach provides investors, insurers, and financiers a robust foundation for making informed decisions, from initial site selection to long-term asset management.

The Role of Insurance and Banking Sectors

Insurance companies have a vested interest in accurately assessing physical risks at the earliest stages of a project. By leveraging our high-resolution climate projections, they can develop risk scores that capture the likelihood and potential impact of hazards, such as extreme temperatures, lightning, or wildfire. In turn, this allows insurers to structure more precise policies, establishing coverage and premiums that reflect the true level of exposure throughout a project’s operational life cycle.

Banks, too, are increasingly aware of how climate change can threaten the viability of their investments. Traditionally, lenders have focused on collateral and revenue projections when evaluating project financing. Nowadays, institutions, such as the International Finance Corporation (IFC), the European Bank for Reconstruction and Development (EBRD), and the European Investment Bank (EIB) require investors to submit detailed climate risk assessments (2). These assessments help demonstrate the project’s environmental benefits and the borrower’s resilience strategy against future climate uncertainties. As a result, credit approvals now hinge more strongly on whether investors have factored in physical climate risks and taken adequate measures—often involving both adaptive engineering solutions and firm risk mitigation plans.

Data-driven Decision Making

Selecting a wind power plant site is a multifaceted process, balancing factors, such as wind resource potential, proximity to transmission lines, and local construction conditions. However, climate-driven risks—like future wildfire probability or increased frequency of intense storms—must no longer remain an afterthought. If a given climate projection indicates a heightened risk of wildfires, for instance, and the topographical data shows dense forestation near the planned site, additional investments in fire suppression systems or auxiliary firefighting equipment may be prudent. In areas with higher lightning frequency, the capacity of lightning protection systems might need upgrading from, say, a 25 kA to a 50 or even 75 kA system to ensure operational continuity.

Our company’s ultimate goal is to provide an online platform where investors, insurers, and banks can collaboratively monitor and assess these data-driven insights. By integrating our analysis into standard feasibility and “bankable” reports, decision-makers gain a clearer understanding of how climate change could affect both the short-term performance and the long-term resilience of their investments.

Conclusion

As the world increasingly relies on wind, solar, and hydropower to bridge the energy gap and reduce carbon emissions, the sector must prepare for the physical risks introduced by the changing climate. While providing cleaner and more sustainable energy, these projects are inherently exposed to environmental extremes. With our high-resolution climate analytics and tailored data products, we empower stakeholders to identify, quantify, and respond to risks with greater precision. In a future marked by uncertainty, a shared focus on robust, data-driven adaptation will be essential for ensuring that renewable energy investments fulfill their potential in both sustainability and resilience.

References

1. IRENA (2021). Renewable Capacity Statistics 2021. International Renewable Energy Agency.

2. IFC (2018). Climate Investment Opportunities in Emerging Markets. International Finance Corporation.

This article is based on the solutions and expertise our company provides, aiming to enhance the resilience of renewable energy projects against climate-induced physical risks.

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