---
title: "Proof of concept"
canonical_url: "https://seatwirl.com/technology/proof-of-concept/"
date: 2026-11-05
author: "thomas"
---

# Proof of concept

03 / Proof of concept

# Proof of concept

To prove the concept, SeaTwirl deployed its 30 kW prototype S1 off the coast of Lysekil, Sweden, in July 2015. S1 was connected to the grid and tested according to plan until it was decommissioned in November 2025, after more than ten years at sea.

[Read about SeaTwirl’s history →](https://seatwirl.com/about/history/)

## Facts about SeaTwirl S1

Height above sea level

7.5 m

Turbine diameter

10 m

Rotor blade height

40 m

Designed for extreme wind speed

17 m/s

Rated power

30 kW

![SeaTwirl S1 off Lysekil at sunset](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAAKCAQAAAAnOwc2AAAAEElEQVR42mNY7YAJGYayIAC+j1vNcYFBWAAAAABJRU5ErkJggg==)

04 / Ten years at sea

## Ten years at sea

A small and ambitious team installed S1 on a limited budget. It is one of few floating wind projects to have been in the water for such a long period of time, and it withstood harsh weather conditions, with autumn and winter storms reaching hurricane wind speeds.

![The S1 generator house among breaking waves in a storm](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAAKCAQAAAAnOwc2AAAAEElEQVR42mNY7YAJGYayIAC+j1vNcYFBWAAAAABJRU5ErkJggg==)

![A service vessel alongside S1 off the Swedish coast](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAAKCAQAAAAnOwc2AAAAEElEQVR42mNY7YAJGYayIAC+j1vNcYFBWAAAAABJRU5ErkJggg==)

![S1 rotating at sea with hills behind it](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAAKCAQAAAAnOwc2AAAAEElEQVR42mNY7YAJGYayIAC+j1vNcYFBWAAAAABJRU5ErkJggg==)

Read on

01

Design

The basic principles of SeaTwirl’s concept.

[](https://seatwirl.com/technology/design/) 

02

Benefits

Robustness, reliability and redundancy.

[](https://seatwirl.com/technology/benefits/) 

Products

Our products

S3, 2 MW and S200.

[](https://seatwirl.com/products/)