Strategic partner · 2020
RWE Renewables
RWE joined the project to test new ways of installing and operating offshore wind in deep waters, contributing offshore experience and operational knowledge.
Project · Full-scale demonstrator
Spain’s first grid-connected floating offshore wind turbine
DemoSATH: a 2 MW concrete floating platform operating off Armintza, Bizkaia.
The project
A full-scale demonstrator for SATH technology.
DemoSATH validates SATH technology in real conditions: a concrete platform built and assembled in port, towed to sea and moored from a single point, rotating freely with waves to maximise wind energy capture.
2MW
Power
85m
Depth
82m
Rotor diameter
~2,000
Household energy / year
Local value chain
75% of the construction budget was delivered by companies located within a 35 km radius.
From port to sea · project phases
DemoSATH, from manufacturing to installation and operation at BiMEP.
Project collaborators
Alliances to develop the DemoSATH project
Phase 1
Validation of SATH technology
RWE and The Kansai Electric Power Co. Inc. (KEPCO) have supported the construction, installation and operation of the demonstrator to validate SATH in real sea conditions.
Strategic partner · 2023
The Kansai Electric Power Co. Inc. (KEPCO)
The Kansai Electric Power Co. Inc. (KEPCO) joined DemoSATH as a strategic partner and co-investor, strengthening the demonstrator's international projection around SATH technology.
Phase 2
Innovation and research to scale up to commercial wind farms
The Kansai Electric Power Co. Inc. (KEPCO) continues in the project, while Kumagai Gumi joins this new phase. The agreement extends DemoSATH operations until 2027 to conduct research, optimise the technology and transfer knowledge to future commercial wind farms.
Strategic partner · 2026
Kumagai Gumi
Kumagai Gumi contributes its construction expertise to assess serial production methods and optimise future decommissioning procedures.
Proven resilience
+13m
wave height endured · November 2023
With wind gusts of more than 140 km/h and waves above 13 metres, DemoSATH has withstood the demanding conditions of the Bay of Biscay, demonstrating the robustness of SATH technology in open-sea operation.
The documentary
The DemoSATH documentary on DMAX
The documentary Mega Structures at Sea shows the project from the inside: technical decisions, port fabrication, offshore installation and commissioning of Spain’s first grid-connected floating offshore wind turbine
Discover the work of the Saitec Offshore team and its closest collaborators: engineering work, marine operations and industrial coordination.