SeaTwirl
SeaTwirl is a Swedish public company developing floating wind turbines based on a vertical-axis design that rotates with its floating structure and keel as one unit. The company is headquartered in Gothenburg and its shares trade on Nasdaq First North Growth Market under the ticker STW.
Fiscal year 2025 · change from previous year
Development 2021–2025
Business
Share of revenueDesign and engineering of SeaTwirl's floating vertical-axis wind turbine concept.
Build and operation of test units used to validate the technology in marine conditions.
Development and protection of technical know-how, patents, and related rights.
Customers
SeaTwirl's direct customers are not yet commercial end-users in the traditional sense; the company is still developing and validating its turbine technology. Its commercial counterparties are typically utilities, energy developers, industrial partners, and strategic collaborators that could adopt, license, finance, or co-develop future offshore wind projects.
Would buy or deploy SeaTwirl turbines for offshore power generation if the technology is commercialized.
Partner on market access, localization, and commercialization, such as the Japan MoU disclosed in reports.
Support development programs and demonstration projects that fund technical validation.
May adopt the technology through licensing, joint ventures, or project-specific deployments.
Strategy
SeaTwirl's strategy is to advance its floating wind platform from prototype validation toward larger commercial turbines that can be deployed in different sites and applications. The company also pursues partnerships and market access agreements to prepare for commercialization in target offshore wind markets such as Japan.
Commercial viability depends on proving the design at larger turbine sizes.
Local partners can accelerate market access, customer validation, and deployment.
The business model requires capital before meaningful commercial revenue arrives.
Geography
SeaTwirl is based in Sweden, with its headquarters in Gothenburg and early prototype activity tied to the Swedish coast near Lysekil. The company has also disclosed commercial outreach in Japan through a memorandum of understanding with a Sumitomo Corporation subsidiary, indicating an international commercialization path.
Risks
SeaTwirl faces the typical risks of a pre-commercial development company: technology may not scale as planned, commercialization may take longer than expected, and future revenue may remain limited. The company also depends on external financing, so dilution and funding availability are central risks, while offshore wind projects carry technical, regulatory, and market-adoption uncertainty.
The company has not yet launched a commercial wind turbine, so sales may remain limited or delayed.
Exposure: Core business model
Development spending must be funded before commercial cash flow exists, often through new equity or other financing.
Exposure: Capital structure
Prototype success does not guarantee performance, reliability, or economics at larger turbine sizes.
Exposure: Product development
Marine installations face weather, engineering, permitting, and logistics complexity.
Exposure: Prototype and future deployments
Accounting
Judgemental itemsA large share of spending is capitalized rather than expensed, affecting operating loss, assets, and future amortization.
Impact: Development asset balance and future impairment risk
Patent costs are capitalized and must be assessed for recoverability if commercialization slows.
Impact: Intangible asset carrying value
If the technology or market outlook weakens, capitalized project assets may need write-downs.
Impact: Earnings volatility
Qualified employee options create non-cash expense and dilution effects.
Impact: Operating costs and share count
Similar listed companies
Publicly listed companies with a comparable business focus.
Eco Wave Power Global AB (publ)
WAVE · Electric Services
Eco Wave Power Global AB (publ) develops and operates onshore wave-energy systems that convert ocean and sea waves into electricity using patented technology…
Nauticus Robotics, Inc.
KITTW · General Industrial Machinery & Equipment, NEC
SEADRILL Ltd
SDRL · Drilling Oil & Gas Wells
Seadrill Ltd is an offshore drilling contractor that owns and operates drillships and semi-submersible rigs for oil and gas customers worldwide.
CTT Systems
CTT · Industrials
CTT Systems AB is a Swedish company specializing in the development and manufacturing of humidity control systems for aircraft.
Seafire
SEAF · Financials
Seafire is a Swedish company group founded in 2016, focused on acquiring and developing profitable companies through active and long-term ownership.
Tidewater Inc
TDW · Water Transportation
Last updated: 24/09/2026