TenneT intends to build several platforms (e.g. Tender HKN, HKWa option HKWb leading to amended Tender planning), which will connect wind farms to the onshore grid by HVAC sea-cables. The platforms within one area will be connected by means of a 66kV cable. The platforms are to carry high-voltage switching and transformation equipment 220kV as well as auxiliary facilities. Intake power from the wind farms will be 66 kV, export power from the platform will be 220 kV. The scope of the intended contracts includes design, engineering, production, delivery, transport and installation of topside and jacket. Topside size L45m x W21m x H30m and weight approx. 3.000 metric tonnes. The weight of the jacket is approx. 1.650 metrictonnes.