On 26 February 2025, electrical connection technology supplier Pfisterer secured a contract from Siemens Energy to deliver turnkey CONNEX cable connector/accessory systems for the BorWin4 (and DolWin4) offshore HVDC grid connection platforms. Pfisterer's scope is the high-voltage cable connector and plug-in bushing systems that interface the converter platforms with the 320 kV HVDC export cables supplied by Prysmian - not the main cable system itself. The contract is a subcontract under Siemens Energy's converter station scope. Classified as procurement_other to reflect that this is an accessory/subsystem contract distinct from Prysmian's main cable_supplier award of 15 September 2022.
In June 2024, Amprion announced that construction of the DolWin4 and BorWin4 offshore grid connection projects in northern Germany had commenced, with work starting in Lingen and Wietmarschen where construction camps are being set up, marking the start of onshore construction activities for BorWin4.
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BorWin4 is a 900 MW high-voltage direct current (HVDC) offshore grid connection system being developed by Amprion Offshore GmbH to connect multiple offshore wind farms in German North Sea Area 6 (e.g. NC 3, NC 4, Nordlicht 2, Waterkant) to the German transmission grid. The scheme comprises the Bo...
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BW4, NOR-6-3
BNetzA confirmed BorWin4 in Netzentwicklungsplan (NEP) 2037/2045 (2023) on 1 March 2024. This confirmation under §12c EnWG creates the legal basis for the responsible TSO to plan, procure, and construct the offshore grid connection system.
BNetzA confirmed the Netzentwicklungsplan Strom 2037/2045 (2023 edition) on 1 March 2024 under section 12c of the German Energy Industry Act (EnWG). This confirmation creates the legal basis and obligation for the responsible TSO to plan, procure, and construct this offshore grid connection system. For regulated German TSO offshore grid connections, the BNetzA NEP confirmation functions as the de facto Final Investment Decision: unlike merchant or developer-led projects that require a separate board-level investment decision and financial close, the NEP confirmation simultaneously authorises and obligates the TSO to invest. Costs are recovered through the offshore grid levy (Offshore-Netzumlage). The NEP 2037/2045 (2023) schedules 25,980 MW of offshore transmission capacity across 16 grid connection systems for commissioning between 2026 and 2032.
On 15 September 2022, Amprion Offshore GmbH awarded Prysmian Group a contract to design, supply, install, and commission the land and submarine HVDC cable systems for the BorWin4 offshore wind grid connection in the German North Sea, as part of a twin award that also covers DolWin4. Under the contracts, valued together at more than EUR 800 million, Prysmian will deliver approximately 1,000 km of ±320 kV single-core copper HVDC cables with XLPE insulation, including submarine sections routed from the offshore converter platforms through the Niedersächsisches Wattenmeer national park and across the island of Norderney to landfall near Hilgenriedersiel, and land cables running largely in parallel with the A-Nord underground corridor, with delivery and commissioning scheduled by 2028.
Amprion Offshore commissioned Siemens Energy / Dragados Offshore consortium for the BorWin4 2 GW HVDC grid connection. Siemens Energy responsible for converter stations including offshore platform technology and onshore converter station.
On 30 March 2021, Amprion Offshore GmbH announced that it had started the bidding process for awarding the converter systems and cable packages for the DolWin4 and BorWin4 offshore grid connection systems, launching a private tender that combines both projects to exploit synergies and covers all converter systems, optional maintenance services, and associated submarine and underground cables.
In March 2021, Amprion, through its subsidiary Amprion Offshore GmbH, submitted its own pre-design for the DolWin4 and BorWin4 offshore grid connection systems together with the associated approval documents to the Federal Maritime and Hydrographic Agency (BSH) for a completeness check, as part of the public planning procedure for the offshore converter platform and cable route approvals.
In 2020, Amprion, together with experienced manufacturers, carried out a Front End Engineering Design (FEED) study for the DolWin4 and BorWin4 offshore converter platforms, developing approaches for the technical design and establishing a clearly defined, uniform system concept that underpinned preparation of the tender documents.
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