Name

Welcon

Legal name

Welcon A/S

Website

https://welcon.dk

Company type

Private

Founded year

1966

Operating status

Operating

Headcount range

251–500 employees

Ownership category

akta.pro rank

Headquarters

HQ city

Give

HQ country

Denmark

HQ region

Europe

Offices5 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Infrastructure, Personnel, Technology or R&D, Operations

Revenue model

1. Wind Turbine Tower Manufacturing: Welcon manufactures custom steel towers for offshore and onshore wind turbines for major OEMs including Vestas, Siemens Gamesa, and Nordex. Towers are produced to specification for specific wind farm projects, with contracts often covering dozens of towers per project. Revenue is recognized upon delivery of tower sections, typically over 1–2 year project timelines. The company has supplied approximately 50% of all offshore towers in Europe.
2. Floating Offshore Foundation Manufacturing: Welcon produces floating offshore wind foundations (TetraSpar and TetraSub) for Stiesdal Offshore Technologies and project developers. These are highly specialized, large-scale steel structures weighing hundreds of tons per component, sold per project as bespoke manufacturing contracts.
3. Precision Component Manufacturing (Flanges, Transition Pieces): Welcon also manufactures precision flange components and transition pieces for offshore wind turbines, in partnership with companies like Smulders for transition piece production at the Port of Albany facility.

Go-to-market motion2 records

Distribution channels4 records

Marketing channels4 records

Core offering

Welcon manufactures large-scale steel structures for the wind energy industry, primarily offshore and onshore wind turbine towers (up to 10m diameter, 70m length, 500 tons) and floating offshore wind foundations (TetraSpar and TetraSub models). The company operates as a Tier 1/Tier 2 supplier in the wind turbine OEM supply chain, producing bespoke towers and foundations under long-term contracts for specific wind farm projects delivered across Europe, the US, and Asia.

Product overview

Welcon is a steel manufacturing company specializing in large-scale steel constructions primarily for the renewable energy sector. The company's product portfolio centres on wind turbine towers (offshore and onshore), floating foundations (TetraSpar and TetraSub models), and transition pieces. Welcon operates as a single unified manufacturing operation rather than a platform with modular products, serving major wind turbine OEMs including Vestas, Siemens Gamesa, and Nordex. The manufacturing capabilities include cutting, plate rolling, welding, surface treatment, assembly, and loading/transport of steel components up to 10 metres in diameter, 70 metres in length, and 500 tons in weight.

Differentiator

Problem solved

Functional benefit

Products and services

• Offshore Wind Turbine Towers Large-scale steel tower structures manufactured for offshore wind turbines. Welcon produces bottom, middle, and top tower sections with diameters up to 10 metres and lengths up to 70 metres (up to 500 tons), serving major wind turbine manufacturers including Vestas and Siemens Gamesa under project-specific long-term contracts.
• Onshore Wind Turbine Towers Steel tower structures for onshore wind turbines, manufactured with the same precision and quality standards as offshore towers. Welcon supplies tower sections to OEMs such as Nordex for projects across Scandinavia, Germany, the Netherlands, Finland, Ireland, and France.
• TetraSpar Floating Foundation The world's first industrialized floating offshore wind foundation, produced by Welcon in partnership with Stiesdal Offshore Technologies under worldwide production rights. It enables wind turbine installation in deep water where fixed-bottom foundations are not viable.
• TetraSub Floating Foundation Next-generation floating foundation three times larger than the TetraSpar model. Enables wind turbines on water 60-1,000 metres deep and can carry a 15 MW wind turbine with a 236-metre rotor diameter. Production involves cylinders measuring 10 metres in diameter weighing 1,000 tons.
• Transition Pieces Steel transition pieces connecting wind turbine towers to foundations in offshore installations. Welcon produces these in partnership with Marmen and Smulders for projects including the Port of Albany facility serving the U.S. offshore wind market.

Quantifiable outcome

• Achieved 0.21mm global flatness tolerance on 7.5m diameter tower flanges — a 79% improvement over the 1mm specification and far below the 2.5mm industry standard
• +4 more outcomes

Named customers7 records

Segments3 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

Seven partnerships are on record, tiered core and minor.

• CNC OnsitecoreTechnology or Integration · 22 May 2025CNC Onsite delivered its custom-built 'Goliath' precision milling machine to Welcon, specifically designed for large-diameter wind turbine tower flanges (6.5–10m diameter). The machine achieves 0.21mm flatness tolerance vs. 1mm specification. CNC Onsite has 12+ years of expertise in machining flanges for the wind industry. The machine is the third custom-built Goliath since 2022.
• MuehlhanminorStrategic or Co-development Partner · 1 March 2023Welcon and Muehlhan entered a joint venture for all paint activities at Welcon's facility in Give, Denmark, effective March 1, 2023. Muehlhan is a highly skilled surface treatment company that had partnered with Welcon for many years prior. The JV creates improved synergies for both parties and Welcon's customers.
• SmuldersminorStrategic or Co-development Partner · 24 August 2021Marmen, Welcon, and Smulders entered into an agreement to produce offshore wind transition pieces at the Port of Albany, New York. Smulders complements the tower manufacturing capabilities of the Marmen-Welcon JV with transition piece production.
• EquinorcoreStrategic or Co-development Partner · 1 September 2020Equinor developed the Port of Albany offshore wind tower manufacturing facility proposal in partnership with Marmen and Welcon, contingent on NYSERDA bid selection. Equinor is also developing US offshore wind assets (Empire Wind, Beacon Wind). Welcon's manufacturing rights for Stiesdal foundations complement Equinor's floating wind ambitions (Equinor commissioned the world's first floating offshore wind farm in 2017).
• Marmen Inc.coreStrategic or Co-development Partner · 17 December 2019Welcon and Marmen signed a MOU to create a jointly owned entity for US offshore wind tower and foundation fabrication. Marmen (based in Canada, one of the largest onshore wind tower manufacturers in North America) brings US market expertise while Welcon contributes offshore tower expertise and Stiesdal foundation production rights. The JV planned a manufacturing plant at Port of Albany, NY, capable of producing towers up to 10m diameter, 70m length, 500 tons, with capacity of up to 200 units. Project contingent on Equinor's NYSERDA bid selection.
• Stiesdal Offshore Technologies A/ScoreStrategic or Co-development Partner · 13 February 2019Welcon holds worldwide production rights for Stiesdal's TetraSpar and TetraSub floating offshore wind foundations. Stiesdal develops industrialized floating foundations for any water depth and any turbine size. Welcon manufactures prototypes (TetraSpar Demonstrator launched 2022, in operation for a year in the North Sea) and the next-generation TetraSub foundations for the global market. The partnership has produced the world's first industrialized floating foundation.
• ShellcoreStrategic or Co-development Partner · 13 February 2019Shell, alongside innogy and Stiesdal Offshore Technologies, commissioned Welcon to produce the world's first TetraSpar floating offshore foundation. This consortium investment in floating wind technology positions Welcon as the manufacturing partner for next-generation deep-water wind deployment. Shell is also a partner in Ecowende (with Eneco) for Hollandse Kust West VI, where Welcon supplies towers.

Scale indicators15 records

Recent moves14 records

Expansion highlights6 records

Direct peers

• Steelwind Nordenham: German manufacturer of monopiles and heavy steel foundations for offshore wind, majority-owned by Dillinger. Direct competitor to Welcon in European offshore wind foundation supply, focused on monopiles for fixed-bottom turbines.
• EEW SPC: German manufacturer of large-diameter steel pipe and monopile foundations for offshore wind, with the only facility capable of producing monopiles up to 10m diameter. Directly comparable to Welcon for monopile/tower component supply in European offshore wind.
• Sif Group: Netherlands-based manufacturer of monopiles and large-diameter steel foundations for offshore wind. Direct comparable as a European offshore wind foundation specialist competing for the same OEM and developer contracts as Welcon.
• Bladt Industries: Danish manufacturer of offshore wind foundations, monopiles, and transition pieces, with facilities in Denmark and the US. Direct competitor to Welcon for offshore wind foundation and large steel structure contracts in Northern Europe.
• SeAH Steel Holdings: Korean steel manufacturer with wind tower production, supplying European and US offshore wind developers. Direct comparable for large-diameter offshore wind tower manufacturing with similar customer overlap among European OEMs.
• Smulders: Belgian steel fabricator producing offshore wind foundations and transition pieces, including at Port of Albany in partnership with Marmen-Welcon. Directly comparable to Welcon as a Tier 1 supplier of large steel structures to European offshore wind developers.
• Marmen: Canadian manufacturer of onshore and offshore wind towers, also Welcon's JV partner at Port of Albany. Direct comparable for wind tower production at scale and the closest North American analogue to Welcon's tower manufacturing capability.

Emerging players

• Principle Power: US-based developer of the WindFloat floating offshore wind foundation, a competing design to Stiesdal's TetraSpar/TetraSub. Comparable to Welcon as a player in the floating offshore wind supply chain, though as a technology designer rather than manufacturer.

Broad incumbents

• Vestas Wind Systems: World's largest wind turbine manufacturer and Welcon's largest customer (V236-15.0 MW platform, Nordseecluster A, Hollandse Kust West VI). Comparable as a Tier-1 offshore wind OEM with deep influence over Welcon's revenue mix and quality benchmarks.
• Siemens Gamesa Renewable Energy: Major wind turbine OEM and one of Welcon's largest customers (Thor, Borssele, Hollandse Kust Zuid). Comparable in the broader offshore wind value chain as a Tier-1 OEM that both drives demand and represents potential vertical integration risk for tower suppliers like Welcon.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles6 records

Subsidiaries1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Welcon