Siemens has received a new order from TenneT TSO to deliver grid connection technology for a high-voltage direct-current transmission (HVDC) unit.

Intended for the DolWin6 offshore windpower project in the North Sea near Germany, the company will work in partnership with Dragados Offshore, which is responsible for the construction and installation of the platform.

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DolWin6 will help supply electricity to around one million German households.

Siemens energy management division CEO Ralf Christian said: “DolWin6 marks a new milestone for the success of the energy transition. We are very pleased with the new order from TenneT for an offshore grid connection in the German waters of the North Sea.

"After BorWin3 and DolWin6 are commissioned, approximately 4.7GW of electrical power will be converted and transmitted to shore using Siemens technology alone."

“This makes Siemens the technology partner in six out of ten direct current (DC) projects. After BorWin3 and DolWin6 are commissioned, approximately 4.7GW of electrical power will be converted and transmitted to shore using Siemens technology alone. This is enough to supply just under five million homes.”

Commercial commissioning of the windpower facility is expected to start in 2023.

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As part of the project, the company will use DC Compact Switchgear (DC CS) technology for the first time. The gas-insulated switchgear for 320kV requires around 95% less space compared to the current air-insulated solutions. If used on an offshore platform, it can reduce the size by around 10%, which will enable Siemens to reduce the cost of grid connections for offshore windfarms.

Approximately 90km in length, the DolWin6 grid connection can connect multiple offshore wind turbines to the mainland.

Image: Wind turbines. Photo: courtesy of Rob Faulkner / flickr.com.