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Gravity-based structure

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A Condeep type GBS under construction in Norway

A gravity-based structure (GBS) is an offshore foundation structure. A common application for a GBS is an offshore wind turbine. Offshore concrete foundations are often constructed locally at a harbour facility nearby the offshore wind farm. Gravity-based structures are also widely used for offshore wind power plants. By the end of 2010, 14 of the world's offshore wind farms were supported by gravity-based structures. T he GBS are suited for water depths greater from 20 meters until approx 100 meters depth. Offshore wind power plants are growing in size and moving towards deeper waters, and therefore GBS is a competitive alternative in comparison with other support structures such as monopiles and jacket constructions as such structures tends to be costly in steel.