A new generation of floating windpower
SeaTwirl enables floating wind power wherever it is needed
For wind farms, oil and gas assets, islands and remote locations, and aquaculture. Whatever the site, our vertical-axis turbines are designed to float from the start, so they need less infrastructure to build, install and maintain.
02 / Partners
Our partners
HFLOW
VERTI-GO partners
Co-funded by the European Union. Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or CINEA. Neither the European Union nor the granting authority can be held responsible for them. About VERTI-GO →
03 / Why offshore wind power?
Wind power for deep water and remote sites
The problem
Bottom-fixed turbines are not economically feasible in water deeper than about 60-80 meters, yet stronger winds blow further out. Meanwhile, many offshore installations, islands and remote communities run on diesel generators, which are expensive and emit CO2.
The markets
SeaTwirl develops turbines for wind farms, oil and gas assets, islands and remote locations, and aquaculture: places that need power at sea or far from the grid.
The solution
Our floating vertical-axis turbines are designed to float from the start. The turbine and floater form one unit with fewer moving parts, and everything that needs service sits just above the water, within reach of small, locally available vessels.
04 / Our markets
Four markets with different needs
Wind farms
The next step for offshore wind is deeper water, beyond the 60-80 meters where bottom-fixed foundations stop being economically feasible. Our floating turbines can be anchored further out, where winds are stronger, and are designed to be serviced from small, locally available vessels.
Read about wind farms →
Oil and gas assets
Platforms far out at sea account for a significant part of the emissions from oil and gas production, and conventional technology has offered few ways to reduce them. Our turbines are built for deep water and can reduce the fossil fuel burned to power a platform.
Read about oil and gas assets →
05 / Top 5 reasons
Top 5 reasons for offshore wind power
1
Oceans
Oceans – an untapped resource: 71% of the Earth is covered by ocean – 92% of which is more than 200 meters deep. SeaTwirl’s floating wind turbines can use these deep waters.
2
More powerful winds
There is much more energy available offshore than onshore, when wind speed doubles, energy is increased eightfold. Offshore wind is stronger and more reliable. Research shows that offshore wind has the potential to achieve 30% more output than onshore because ocean winds are 5%-10% stronger.
3
New locations
Floating wind turbine structures can be placed at greater depths than conventional, bottom fixed, offshore turbines. Floating turbines offer greater flexibility and reduce risk of conflicts with other ocean industries.
4
Energy security
Offshore wind power enables production of electricity close to urban areas, often near the coastline. Locally-produced power means reduced transport losses, lower infrastructure costs, and most importantly energy security with reduced dependencies on energy imports.
5
Market potential
There is a great market potential in offshore wind power. WindEurope expects Europe’s offshore wind capacity to grow from 39 GW at the end of 2025 to 73 GW by 2030.
“Today Europe doubles down on offshore wind. Government cooperation on offshore wind buildout can help crowd in €1 trillion of investments in the next decade.”
Malgosia Bartosik, CEO of WindEurope, on the Investment Pact signed at the North Sea Summit in Hamburg, January 2026
06 / Our turbines
Our Turbines
07 / Our technology
Our Technology
SeaTwirl’s unique floating vertical-axis wind turbine is a robust solution designed from the start for the deep-water offshore environment. A low center of gravity, enabled by integrating the tower and the SPAR into one rotating unit, provides many beneficial qualities. The turbine enables easier access for service and maintenance which results in lower maintenance costs and the possibility of using locally available vessels.
Floating turbine
The offshore wind industry is dominated by bottom fixed turbine technology. In a floating environment the context is different, and we are convinced that the vertical-axis turbine has an important role to play in this market. The Global Wind Energy Council forecasts that floating offshore wind will grow from 278 MW at the end of 2025 to 18.8 GW by the end of 2035, with almost all of that growth coming after 2030.
Easy maintenance
Parts requiring maintenance are inside the Generator housing, which is easily accessible, right above water level and below the wind turbine.
Integrated structure
SeaTwirl offers an integrated solution where the turbine and foundation are merged from the start, eliminating the complex interface between wind turbine and substructure.
08 / Challenges and striving goals
The challenge
SeaTwirl and our planet are facing a global challenge. We want to make our contribution to eliminate the use of fossil fuels and significantly reduce its devastating long-term effects on the environment and all other life forms. We firmly believe that our work will make a difference. We define the challenge as addressing three important goals:
“Global electricity demand is forecast to increase at a brisk average annual rate of 3.6% over the 2026-2030 forecast period, supported by rising consumption from industry, electric vehicles, air conditioning and data centres.”
IEA, Electricity 2026: Analysis and forecast to 2030
CO2 reduction
Reducing carbon emissions to a sustainable level, a.k.a. a net zero carbon footprint.
2 °C cap
We want to be actively involved in keeping the global rise in temperature below the two degree threshold.
Good life
We believe that clean and affordable energy is vital for our society to prosper.
09 / About us
About us
SeaTwirl was founded in 2012 with a pure focus to develop a wind turbine specifically for the deep waters. Commercial offshore wind power is currently almost only built on bottom fixed foundations, meaning that projects are limited to shallow waters up to approx. 60-80 meters. The next generation of wind power is floating turbines for the deep waters. SeaTwirl has a unique floating wind turbine technology, based on a vertical-axis turbine on a rotating SPAR foundation. The simplicity of the design, with standardized components, low center of gravity, and easy access for maintenance are the main big advantages. SeaTwirl installed its first prototype in the sea in 2015 and has been listed on Nasdaq First North Growth Market since 2016.
Besides our HQ in Gothenburg Sweden, we have representation in the Nordics, UK, South America, and Asia.
10 / Investor relations
Investor Relations
SeaTwirl AB is listed on Nasdaq First North Growth Market under the ticker STW. The company is in the development phase, and an investment in its shares carries a high level of risk. Reports, press releases and information about the share are on our investor relations website.