Hydro is developing a floating offshore wind turbine concept called Hywind. The document provides technical specifications of the floating wind turbine design, which includes a 2.3 MW turbine on a deep draft cylindrical floating hull that is anchored to the seafloor. Extensive scale model tests were conducted and showed the design had low dynamic motion in waves up to 14 meters. The design faces challenges around fatigue loads on the steel tower but aims to achieve low costs through simple anchoring and fabrication/installation in sheltered waters. The Hywind concept has large potential for providing renewable energy on a scale comparable to other offshore energy sources.

1. Hywind - Floating wind power production
Alexandra Bech Gjørv
Senior Vice President, Norsk Hydro ASA
Oil & Energy
2006-05-24

2. Hydro is developing innovative energy solutions
based on renewable resources
Dato: 2006-05-24 • Side: 3 • Oil & Energy

3. 5
Technical data
WTG: 2,3 MW
Turbine weight: 138 tonnes
Turbine height 65 m
Rotor diameter: 82,4 m
Draft hull: 100 m
5300 m3
Displacement:
Diameter at water line: 6m
Diam. submerged body: 8,3 m
Water depths: 120-700 metres
Mooring: 3 lines

4. Many advantages compared to near shore wind
Higher winds further out
Relatively robust and cost
efficient design
Minimal offshore work
Independent of location, less
conflicts
Flexible on grid connection
Dato: 2006-05-24 • Side: 7 • Oil & Energy

5. 6
Offshore location 10 km off the coast of Karmøy, Norway

6. 7
Long way from idea to commercial concept
Current Onshore connected parks
status
Medium park
Market Focus
Demo
Cost Focus
Model test
Concept & theory
Technological Focus

7. Extensive model test at Marintek in Trondheim
Simulated water depth - 320 meters
Significant wave height: 3 – 14 meters (100 years condition)
Wind speeds: 8 – 30 m/sec
Model tests showed a very good correlation with teoretical models
Dato: 2006-05-24 • Side: 8 • Oil & Energy

8. Challenges for floating wind turbines
The Challenge:
Achieve satisfactory fatigue strengths
in the steel tower
Low fabrication and installation cost
The Solution:
A deep bouy (SPAR) with low dynamic
response compared to the
displacement
3 point anchoring system with low cost
components and installation cost
Fabrication, completion and testing in
sheltered waters
Dato: 2006-05-24 • Side: 9 • Oil & Energy

9. Active control reducing turbine motion
Dato: 2006-05-24 • Side: 10 • Oil & Energy

10. Innovative cost-efficient anchoring concept
Dato: 2006-05-24 • Side: 11 • Oil & Energy

11. 9
Taking the lead from shore to sea
10 m/s 11 m/s
9 m/s
7 m/s
3 MW 3-5 MW 5+ MW 5+ MW
0-30
30-70 100-700
5 MW + WTG
Efficient O&M
Jacket installation

12. Floating wind turbines
Potential for offshore power supply
Shore
Capacity
Total load
100 MW
100 MW
Max capacityt
200 MW
Dato: 2006-05-24 • Side: 14 • Oil & Energy

13. 125 TWh Hywind
A large long term potential
Natrual gas from Ormen Lange will produce 125 TWh/year for 20 years
The same amount can be produced from a Hywind windfarm with a size of
20 x 40 miles – for ever
Dato: 2006-05-24 • Side: 16 • Oil & Energy

14. 10
Bridgehead market
Medium-term market
opportunities
Floating wind turbines have global potential
Map: NASA
Deepwater sites exist near major consumption areas
•
Market assessment based on:
•
• Water depth
Wind conditions
•
Regulatory regimes
•
Market size
•
Price/incentives schemes
•