SeaTwirl is a new principle to store and harvest offshore wind energy. SeaTwirl uses the ocean sea water as a bearing and can therefore use cheaper and heavier materials and function as a large low speed flywheel. By using this new principle offshore wind power plants can be built without any gearbox, transmission line or roller-bearings to take up the weight from the turbine. The new principles main advantages are therefore simplicity and the possibility to store energy without any conversion. SeaTwirl can therefore take wind power to a new level of scale and cost effectiveness.

SeaTwirl uses a vertical axis wind turbine to absorb the wind energy and a torus ring to store this energy. SeaTwirl uses the physical law for conservation of momentum to enable the storage capacity. When energy should be stored SeaTwirl transports fluids from a less rotationally centered position to a more rotationally centered position to rotate faster, as a skater doing a pirouette. In this way it can store large amounts of energy at low speed and tap it at higher rotational velocity when the demand for energy rises. SeaTwirl can in this way produce energy even if the winds have stopped blowing.

An illustration of SeaTwirl is seen above. 1 indicates the vertical wind turbine. 2 indicates the torus ring used by SeaTwirl to fill with water and store energy. 3 indicates the float body rotating in direct contact with the water and using the water as a roller bearing. 4 indicates the generator at the bottom of the float body. All these parts rotate together as one and the only thing not rotating is the generator axis and anchorage seen below the generator.