Sumitomo Electric Industries has officially opened the UK’s first High-Voltage Direct Current (HVDC) subsea cable manufacturing plant at the Port of Nigg in the Scottish Highlands. The £350 million flagship facility establishes local industrial capability to resolve grid bottlenecks and deliver offshore wind power directly to areas of high demand.
Establishing National Cable Manufacturing Capability
Sumitomo Electric Industries. has officially opened the UK’s first HVDC subsea cable factory at the Port of Nigg in Scotland. Representing a £350 million direct investment in the Highlands economy, the 58,000-square-metre facility occupies a 15-hectare site within the Inverness and Cromarty Firth Green Freeport.
HVDC subsea cables function as subsea electricity superhighways, carrying bulk renewable power efficiently over long distances. Operating as the UK’s premier production base, the state-of-the-art plant will manufacture 525kV XLPE HVDC subsea transmission cables and subsea inter-array cables to link offshore wind fields directly with high-demand population centres.
Economic Impact and Local Workforce Upskilling
The opening reinforces Scotland’s position as a destination for inward investment and advanced renewable manufacturing. Supported by £24.5 million in Scottish Government construction funding and £25 million in UK Government Green Freeport seed funding, the project establishes direct industrial capacity in the Highlands.
- 200+ High-Skilled Direct Jobs: Created locally at the Port of Nigg manufacturing site.
- 400+ Total Jobs: Projected across the broader UK supply chain network.
- Train-the-Trainer Model: Knowledge transfer delivered through specialized operator training programmes conducted in Japan.
Resolving Grid Infrastructure Bottlenecks
Connecting offshore wind resources to inland electrical grids remains one of the largest operational challenges facing the UK’s energy transition. Domestically produced subsea transmission lines tackle the severe supply chain shortages that currently delay renewable deployment.
Anchor contracts are already supporting this strategic infrastructure pipeline:
| Project / Partner | Contract Focus | Strategic Outcome |
| SSEN Transmission | Shetland 2 Subsea Cable Project | Serves as the primary anchor for the £350m facility investment. |
| National Grid | Sea Link HVDC Cable Supply | Part of a £28bn UK supply chain commitment for next-gen grid infrastructure. |
Strategic Playbook for Infrastructure Leaders
The launch of the Port of Nigg plant offers three critical insights for enterprise decision-makers navigating large-scale infrastructure investments:
Anchor Infrastructure Through Public-Private Co-Investment
Blending regional enterprise funding, freeport tax incentives, and private capital creates stable conditions for multi-hundred-million-pound capital projects.
Build Resilient Domestic Supply Chains
Transitioning away from total reliance on international supply chains mitigates global shipping delays, shortens project lead times, and ensures regulatory compliance.
Leverage Long-Term Capital Certainty
Substantial energy grid investments, such as SSEN Transmission’s £29bn five-year plan, provide the long-term commercial visibility required for major global manufacturers to establish localized production hubs.
Rob McDonald, Managing Director of SSEN Transmission, said: “The opening of Sumitomo Electric’s new cable manufacturing facility is a landmark moment. Not only for Scotland’s energy transition but for its economy too, And, we’re proud of the role our proposed Shetland 2 subsea cable project played as an anchor for this investment.”
