SeaTwirl's S1: A small-scale workhorse

30 kW

The low power output can be used for specialised application areas.

Installed in 2015

S1 has withstood the test of time and weather.

The Concept Model

S1 sets a new benchmark for offshore windpower.

About S1

SeaTwirl deployed the 30kW floating wind turbine off the coast of Lysekil in July 2015. S1 has been connected to the grid and tested according to plan since its deployment.

The project was implemented by a small and ambitious group on a limited budget. S1 is one of the very few floating wind power projects in the world to have been launched and operated for a longer period of time. S1 has withstood harsh weather conditions, autumn and winter storms reaching hurricane wind speeds. This shows how robust our design is.

SeaTwirl' S1 running since 2015 – a true workhorse.

Potential customers

Although S1 is a small 30-kW turbine, it offers a practical solution in a number of situations.

Test platform for energy companies

S1 offers energy producing companies an attractive test platform for offshore wind power.

Alternative to diesel generators in remote areas

In remote areas that are off-grid or prone to power outages, S1 is an interesting alternative.

Organisations wanting to go green

Many organisations are interested in reaping the benefits of renewable energy.

“SeaTwirl with its simplicity and cost-effective solutions will become a real challenger in the offshore wind power market”
Peter Laurits
CEO, SeaTwirl


SeaTwirl’s S1 at a glance.


Height above sea level: 13 metres (below sea level: 18 metres)

Turbine diameter

10 metres


 S1, Test Lab Lysekil, is placed on a depth of 35 metres

Rated power of turbine

30 kW. Multiple S1’s can be placed in a dense pattern for increased output.

Advantages of SeaTwirl

  • Simple, robust design with a minimum of breakable moving parts, which means less downtime and more output
  • Provides easy access to parts requiring maintenance
  • Stable structure due to the low centre of gravity
  • The water supports the weight of the wind turbine which reduces stress on the bearings
  • Scientific reports show that vertical axis wind turbines have a high structural limit and can be built larger than horizontal-axis wind turbines.

Areas of use

  • Small-scale energy production
  • Islands and remote locations
  • Fish farms
The SeaTwirl S1 is easily accessed when maintenance is planned since all major components are at sea level.
SeaTwirl S1 in operation. Here in a light breeze.
The storm Helga passed over Sweden on December 4, 2015 with Hurricane winds of up to 35m/s, without SeaTwirl S1 been negatively affected.

Are you interested in our products?

Interested in how SeaTwirl can help your energy project deliver renewable energy at the lowest cost available? Welcome to contact us for a more in-depth presentation of our products and projects!

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Do you want to work with the offshore wind of the future? See available job openings here.