Offshore wind power station is constructed from many elements. The entire structure maintains its stability thanks to foundations. Depending on the geological structure of the seabed and on the depth, various technologies are used:
a) monopile – it is a foundation with a concrete or steel base which is respectively drilled or driven into the seabed,
b) jacket foundation;
c) tripod consisting of three pillars placed on or driven into the seabed;
d) gravity foundation – consists of a steel or concrete base placed on the seabed.
Moreover, a windmill consists of:
Tower – usually it is a steel conical structure with a circular cross-section, made up from several or more than ten steel or concrete segments connected with one another. It may be even 150 metres high.
Nacelle – it hosts a power generator that converts wind energy into electricity. The nacelle is located on the tower and it aligns itself against the direction of the wind. The generated beam is sent via an energy cable located in the tower, first to an offshore power substation, then to an onshore one.
Rotor – a rotor of a typical wind turbine consists of three glass fibre blades. The rotor diameter may reach approx. 200 m.
Hub – it is a central rotor part responsible for the rotation of the blades.
Due to technological advancements and long duration of individual construction phases, it is hard to accurately determine a specification for the structure.