Siemens Energy and Dragados Offshore secure DolWin4 and BorWin4 contracts

Amprion Offshore announced it has awarded awarded contracts to Siemens Energy and Dragados Offshore for turnkey delivery of the High Voltage Direct Current (HVDC) converter platforms of both the DolWin4 and BorWin4 grid connection projects.

DolWin4 and BorWin4 offshore grid connection systems, which run largely in parallel, are scheduled to go into operation in 2028 and 2029. From the North Sea wind farm and offshore platforms, the cables will run 60 and 125 kilometers at sea. They cross below the island of Norderney and reach the coast in the Hilgenriedersiel. From there, they run for around 155 kilometers as underground cables toward the Hanekenfähr substation in Lingen (Ems), where Amprion will connect them to its transmission network. There, the Emsland nuclear power plant will be taken off the grid at the end of 2022. They will have the capacity to transmit 1.8 GW off electricity generated offshore.

Siemens Energy's scope of supply consists of two offshore converter platforms and two associated stations on land. The platforms convert alternating current, as produced by wind turbines, into direct current. The direct current is then transferred to a high-voltage direct current transmission cable (HVDC cable) for transport. A second converter station on land then converts the electricity back into alternating current.

In addition to supplying the technology, Siemens Energy will also take over the complete maintenance of the converter solutions for an initial period of 10 years. All high-voltage equipment for the two connection systems, such as converter technology, transformers, and switchgear, will be manufactured by Siemens Energy in Europe.

Dragados Offshore S.A. (a subsidiary of the VINCI Group) is responsible for providing the offshore platforms, including detail design and engineering, procurement, fabrication, construction, load out, transportation, installation and hook-up of the offshore platform, and installation and commissioning of its platform systems.  Construction will take place at the company's yard in Cádiz, Spain.

"With Siemens Energy and Dragados Offshore, we are awarding the contract to two companies that are experienced in the construction of converter stations,"
said Peter Barth, Managing Director of Amprion Offshore.

"This was particularly important to us in our first two offshore projects." In addition, he says, the partners impressed with their performance, solution orientation and market-driven conditions. They have also agreed to complete BorWin4 for the accelerated scenarios of the German government as early as 2028 - one year earlier than planned. "In this way, Siemens Energy, Dragados Offshore and Amprion Offshore are making an important contribution to accelerating the energy transition,"
added Barth.

"We are looking forward to working together with Siemens Energy and Dragados Offshore,"
adds Dr. Carsten Lehmköster, also Managing Director of Amprion Offshore. "Together, we will take an innovative approach." For example, the converter stations at sea will be designed as unmanned platforms. All stations will be maintainend every year.

"Both aspects are innovative regarding converter platforms in the German North Sea and will ensure significant cost reductions in the long term,"
said Peter Barth.

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