The floating foundation

The floating foundation is a square shaped barge:

  • The shell is a ring with a central opening (Damping Pool©), patented by Idéol, which softens the movement from swells.
  • The base is extended around the entire perimeter of the floater to form a skirt that further softens the frequency of the swells.
  • The wind turbine is fixed to the bridge, at the back of the floater via an intermediary transition piece.

The advantages of a floating foundation:

  • The concept of a floater can be adapted to any type of wind turbine (mass, capacity) or environmental conditions.
  • Once the entry data is determined, the dimensions of the floater can be optimized.
  • Its relatively reduced size also means it can be integrated into the port environment without difficulty.
Technical data
Type Semi-submersible barge
Material Concrete
Size 53m/53m/10m
Concrete vol. 3000m3
Floater mass 8000T
Anchoring 6 anchor lines
Anchor Drag Anchor type

A full service technology developed by the Bouygues Travaux Publics / Idéol group:

  • Design studies
  • Construction
  • Floater installation and on site anchoring offshore
About Idéol

Company created in La Ciotat in 2010
2.8 M€ of turnover in 2015
60 employees, 90% of which are experienced engineers

  • Internationally recognized, patented Damping Pool technology
  • 6 in-basin trials
  • 1 demonstrator commissioned in France in 2018 (the Floatgen project, 1st offshore wind turbine in France) and a second one in Japan in mid-2018
  • A pipeline of commercial-scale projects, especially in Japan
About Bouygues Travaux Publics

2 000 M€ of turnover in 2015
2 777 employees
Headquarters in Guyancourt (78)
46 years of experience

  • Ability to develop large design/construction projects internationally
  • Maritime project know-how
  • Financial standing favoring the “bankability” of the project

the SENVION turbine

About the Senvion 6.2M152 offshore wind turbine

Senvion adapted its 6.2M152 wind turbine to the specifications of the floating foundation developed by the EolMed consortium. The Senvion 6.2M152 offshore wind turbine’s rotor has a diameter of 152 meters and a swept area greater than the surface of three soccer fields.
Thanks to a larger rotor and a proven “drive train” system, the 6.2M152 turbine can generate competitive energy on the high seas with a lifespan of 25 years instead of 20. With a nominal capacity of 6.15 megawatts, each Senvion 6.2M152 wind turbine can provide the electrical energy for 12,500 inhabitants, roughly 4,000 households.

About Senvion

Senvion has been gaining experience for more than 25 years in the field of offshore and onshore wind turbines. No other wind turbine builder can match Senvion’s offshore experience in the area of 5 to 6 megawatt turbines with more than 140 wind turbines installed on the high seas.
Senvion is proud to provide the first floating pilot wind farm in France with its capacity for innovation, its role as a wind power pioneer in France with a presence of 15 years, 1,000 wind turbines in service in the country, as well as its national presence with 14 locations around France.

Technical data
Nominal capacity 6.15 MW
Starting speed 3,5m/s, soit 12.6km/h
Nominal wind speed 12 m/s, soit 43.2km/h
Stall speed 30 m/s, soit 108 km/h
Diameter 152m
Rotor swept area 18 146m2
Or an area greater than 3 soccer fields

1,683 M € in turnover in 2015(*)
4000 employees worldwide
International builder with a presence in France since 2002
25 years of experience

*2015 fiscal year (April 1st, 2015 – December 31, 2015)

Composition of a Senvion 6.2M152 wind turbine

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