Cadeler, Vattenfall sign offshore wind service MoU

Available on EDGAR 09/22/2026 - 06:08 AM EDT Accepted by SEC EDGAR 09/22/2026 - 06:08 AM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Cadeler A/S (CDLR), through its dedicated offshore wind service platform Nexra, has entered into a memorandum of understanding with Vattenfall Vindkraft AB for a strategic collaboration to explore next-generation operations and maintenance solutions for offshore wind.

The collaboration focuses on advancing innovative Major Component Exchange capabilities by combining operational expertise, service methodologies and long-term planning to support more efficient, scalable and safe offshore wind maintenance across multiple turbine platforms. Cadeler describes this as aligned with the industry’s growing installed base and increasingly complex maintenance needs, aiming to improve long-term asset performance, reliability and lifecycle costs.

Key Terms

memorandum of understanding, operations & maintenance (O&M), Major Component Exchange (MCE), offshore wind installation vessels, +1 more

5 terms

memorandum of understanding regulatory

"have entered into a memorandum of understanding (MoU) for a strategic collaboration"

A memorandum of understanding (MOU) is a formal agreement between two or more parties that outlines their shared intentions and plans to work together. It acts like a handshake in writing, clarifying each side’s roles and expectations before any official contract is signed. For investors, an MOU signals that parties are serious about collaboration, which can influence future business opportunities and potential growth.

operations & maintenance (O&M) technical

"development of next-generation operations & maintenance (O&M) solutions for the offshore"

Operations & maintenance (O&M) are the ongoing activities and costs required to run, service, inspect and repair a physical asset or business system so it continues to function as intended. Think of it like the regular upkeep and repairs on a house — these recurring efforts determine reliability, lifespan and operating cost, so investors watch O&M closely because higher or unpredictable O&M can reduce profits, cash flow and the value of an asset.

Major Component Exchange (MCE) technical

"advancing innovative Major Component Exchange (MCE) capabilities, combining operational"

offshore wind installation vessels technical

"owns and operates the industry’s largest fleet of jack-up offshore wind installation vessels"

Specialized ships and marine platforms equipped with heavy cranes, foundations, cable-laying gear and accommodation used to transport, lift and install wind turbine components at sea, often in deep or rough-water locations. Like a floating construction site, these vessels determine how fast, safely and cheaply offshore wind farms can be built and maintained, affecting project schedules, capital costs, contractor revenue and the value of related assets.

lifecycle costs financial

"improve long-term asset performance and reduce lifecycle costs, helping to keep offshore"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did Cadeler (CDLR) announce in its September 2026 Form 6-K?

Cadeler announced a memorandum of understanding between its Nexra platform and Vattenfall Vindkraft AB to explore next-generation operations and maintenance solutions for offshore wind, with a focus on innovative Major Component Exchange capabilities and scalable maintenance approaches.

Who is Cadeler collaborating with under the new MoU disclosed by CDLR?

Cadeler, through Nexra, is collaborating with Vattenfall Vindkraft AB. The parties intend to explore concepts and solutions to improve the efficiency, safety and scalability of offshore wind maintenance activities across multiple turbine platforms.

What is the focus of the Cadeler–Vattenfall offshore wind collaboration?

The collaboration focuses on advancing innovative Major Component Exchange (MCE) capabilities, combining operational expertise, service methodologies and long-term planning to support more efficient, predictable and effective operations and maintenance of offshore wind assets.

How does Cadeler describe the industry need addressed by this MoU?

Cadeler notes that the growing installed base of offshore wind turbines is driving more complex maintenance needs, making efficient strategies and access to specialised MCE capabilities increasingly important for long-term asset performance, reliability and availability.

What is Nexra’s role within Cadeler (CDLR)?

Nexra is Cadeler’s dedicated operations and maintenance service platform, established in 2025 to support the global offshore wind aftermarket by providing heavy maintenance services and leveraging a flexible vessel portfolio from Cadeler’s wider fleet.

On which exchanges is Cadeler (CDLR) listed?

Cadeler is listed on the New York Stock Exchange under ticker CDLR and on the Oslo Stock Exchange under ticker CADLR, and positions itself as a global leader in offshore wind turbine transport and installation.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13A-16 OR 15D-16 OF THE

SECURITIES EXCHANGE ACT OF 1934

For the month of September 2026

Commission File Number: 001-41889

CADELER A/S

(Translation of registrant's name into English)

Kalvebod Brygge 43

DK-1560 Copenhagen V, Denmark

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F x Form 40-F o

Press Release

Copenhagen, 21 September 2026 – Cadeler A/S ("Cadeler"), through Nexra, its dedicated offshore wind service platform, and Vattenfall Vindkraft AB have entered into a memorandum of understanding (MoU) for a strategic collaboration to explore the development of next-generation operations & maintenance (O&M) solutions for the offshore wind industry.

The collaboration will focus on advancing innovative Major Component Exchange (MCE) capabilities, combining operational expertise, service methodologies, and long-term planning to explore more efficient and scalable approaches to offshore wind maintenance and support the evolving needs of offshore wind asset owners and operators.

As the global installed base of offshore wind turbines continues to grow and mature, efficient maintenance strategies and access to specialised MCE capabilities are becoming increasingly important to ensuring long-term asset performance, reliability and availability.

Through the collaboration, Nexra and Vattenfall will explore concepts and solutions designed to improve the efficiency, safety and scalability of offshore wind maintenance activities across multiple turbine platforms, with the ambition of supporting more predictable and effective maintenance of offshore wind assets.

Jacob Christian Gregersen, Chief Growth Officer at Cadeler, commented:

“The offshore wind industry is entering a new phase, with a growing installed base and increasingly complex maintenance needs. This collaboration gives us an opportunity to combine complementary expertise and explore new approaches to Main Component Exchange, helping shape more efficient and scalable O&M solutions for the assets of tomorrow.”

Pavlo Malyshenko, Head of Generation, Offshore Wind at Vattenfall, commented:

“The long-term competitiveness of offshore wind will depend not only on how we build projects, but also on how effectively and efficiently we operate and maintain them over decades. Every major component exchange comes with significant cost, complexity and lost generation. Through this collaboration, we want to explore smarter approaches that support safe and reliable operations, improve long-term asset performance and reduce lifecycle costs, helping to keep offshore wind an affordable source of fossil-free electricity.”

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For further information, please contact:

Cadeler Press Office

press@cadeler.com

Mikkel Gleerup CEO, Cadeler +45 3246 3102 mikkel.gleerup@cadeler.com Alexander Simmonds EVP & CLO, Cadeler +44 7376 174172 alexander.simmonds@cadeler.com About Cadeler:

Cadeler A/S (Cadeler) is a pure-play offshore wind installation partner and a global leader in offshore wind turbine transport and installation. The company owns and operates the industry’s largest fleet of jack-up offshore wind installation vessels and is expanding its capabilities into full-scope foundation transport and installation, as well as operations & maintenance. With its modern fleet and depth of expertise across onshore and offshore operations, Cadeler supports the safe, efficient and reliable delivery of offshore wind projects worldwide. Cadeler is listed on the New York Stock Exchange (ticker: CDLR) and the Oslo Stock Exchange (ticker: CADLR). For more information, please visit www.cadeler.com.

About Nexra:

Nexra is Cadeler’s dedicated Operations & Maintenance (O&M) service platform, established in 2025 to support the growing offshore wind aftermarket globally. Nexra provides heavy maintenance services throughout the operational lifetime of offshore wind assets. Nexra leverages a flexible vessel portfolio, primarily drawing on Wind Zaratan, Wind Scylla and Wind Keeper, with the ability to deploy vessels from across the broader Cadeler fleet when required. This flexibility complements Cadeler’s core installation activities, supporting efficient fleet-wide utilisation and delivering responsive support to the group’s clients across key offshore wind markets.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date: September 22, 2026 CADELER A/S

(Registrant)

By: /s/ Mikkel Gleerup        
Name:     Mikkel Gleerup
Title:    Chief Executive Officer

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