Borgen (Sway) Copy_Outsourcing_book_temp.qxd 02/03/2010 15:54 Page 52
Floating Wind Power in Deep Water – Competitive with Shallow-water Wind Farms?
in-house or by investors in order to develop and commercialise the In Figure 1 the cost trends relative to different water depths are shown.
technologies, the carrot being that if the cost of energy produced from In approximately 40–50m water depth, tri-floaters and multiple-
floating windfarms turns out to be interesting to energy companies, tension-leg platforms can be used, but the tower and foundations
seem to be more expensive than the jacket solution up to around 90m
for the multiple-tension-leg platform. For the tri-floaters, the jacket
By participating in the seems to be more economical for even greater depths. Relative to the
operation of the prototypes,
Sway system, the jacket seems to be the most economical alternative
from 30m to about 70m depth. However, when the water depth
energy companies may
reaches approximately 60–70m, the Sway technology will cost the
benefit from early market
same as the jacket. An interesting point is that moving into waters
deeper than 70m, the cost of the Sway system actually decreases
operation experience.
sharply, and at 100m the cost flattens out at a level below that of the
jacket at only 30m water depth. The reason for this is that the Sway
system (see Figures 2 and 3) utilises the water depth to gain its stability.
the potential for offshore renewable power production will increase To achieve the optimum stability-to-weight ratio, the tower needs a
dramatically worldwide. minimum water depth of approximately 100m for a 5MW turbine.
A cost estimation (see Table 1) was carried out by the author based on It can therefore be seen that if the water depth exceeds approximately
publicly available information on steel weights for the different 30–40m, it would be more economical to avoid depths between 40 and
tower/foundation/anchor concepts and cost per kg for the type of 100m and instead place the windfarms in 100–200m water depth. This
construction in question. The costs of the anchor systems were may at first seem to be a paradox, but the reason behind it is that when
assessed based on a rough estimation of the assumed anchor line the floaters start to compete with the jackets, the Sway-type floating
lengths and forces in the anchor system. The installation costs were monopiles, being arguably the most economical of the floating concepts,
also based on estimations assuming the cost benefits of multiple are the most energy cost-efficient at water depths greater than 100m.
installations in a 200MW windfarm. The figures should therefore only
be used as a generic approximation of the relative costs of the As a result, it could be possible to reduce the cost of energy compared
different solutions. with a 30–40m depth windfarm by instead placing the windfarm
Tower factory Dynawind, the only independent tower producer in Sweden, cooperates today with 2 world leading
turbine suppliers. Started in 2007 Dynawind has a modern high quality and highly efficient tower factory.
Transportation Located in Kristinehamn, just between Stockholm and Oslo, with own transportation resources and
competence as well as good port facilities.
Erection & Dynawind has successfully managed the erection and start-up of approx. 50 MW in Sweden.
Commissioning
Service Dynawind service organisation is today responsible for more than 60 MW installed windpower.
Project Dynawind has successfully managed the full turn-key responsibility for Vindpark Vänern.
management A 30 MW project and the first ever off-shore project built in a large lake.
Your partner in Sweden
Dynawind AB
Box 159, SE-681 23 Kristinehamn, Sweden
Phone: +46 550-34300
Fax: +46 550-34301
www.dynawind.se
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