- Minimum Environmental impact
Hammering of large piles is not required for this concept. All other marine operations required to transport and install the Gravity Base have minimum environmental impact. The operations required to prepare the seabed and to install the foundations are of short duration and have minimum disturbing effect on sea life.
- Low CO2 footprint
Low carbon footprint across the supply chain as a result of using concrete instead of steel, (ref.: Carbon Trust 2015).
- Ecological friendly
An installed concrete gravity base structure forms an artificial reef which attracts a lot of marine life. The outside of the concrete structure could be made ecology friendly such that oysters or corrals can attach and enhance the marine life. After the lifetime of the wind turbine a GBF has the potential to be repowered as the lifetime .
- Cost efficient
GBSs are particularly cost effective in deeper waters(beyond 35m) and larger WTGs, (ref.: Carbon Trust 2015). Cost of the foundations do not escalate when scaling up to large waterdepth and lagere WTGs by nature of the design of the self floating Gravity base. As an example for the MonoBaseWind a doubling of the WTG power would increase the costs of the installed foundation with only about 20% to 30%.
- Low construction risk
Fabrication of the MonobaseWind is comparable to the construction of tunnel segments and bridge pylons and bears little risk of cost over run and construction errors due to the vast experience with this type of marine concrete structures.
Transport and installation has been optimised to reduce risks and minimise exposure to the harsh North Sea environment based on the lessons learned by offshore marine contractors working for the Oil & Gas Offshore industry.
- High local content
Construction of the GBFs can be done at local yards, and docks using local labour and engineering capacity. Also the supply of steel and concrete can be organised locally which further increases the local content.
- High longevity
Longevity of a GBS is high due to concrete being an extremely durable material in the marine environment:
- Reduced maintenance is required and solutions with low sensitivity to fatigue.
- Exploit the fact that OpEx cost could be significantly reduced, lowering the overall LCOE.
- There is potential to extend lifespan of GBS for repowering scenarios (lasting 100 years) without major investments.