More than 839,000 tonnes of armourstone and aggregates supplied to Tier-1 marine works in Portugal, France, the United States, Germany and Spain — alongside the leading European contractors in the sector.
Since 2019 we have been supplying high-density armourstone and aggregates to offshore wind and submarine high-voltage interconnection projects, in collaboration with the leading European marine contractors: DEME, Van Oord, Jan de Nul, Boskalis and Tideway Offshore Solutions.
The density of amphibolite (>3.10 T/m³) is especially valued for scour protection of offshore foundations and for ballast and protection of submarine cables, where the rock must remain stable on the seabed under Atlantic current and wave loading.
World's first commercial-scale semi-submersible floating wind farm and Europe's first floating wind farm in continental waters. Three Vestas V164 turbines (8.4 MW each, 25 MW total) on WindFloat semi-submersible floaters by Principle Power. HSS supplied armourstone for protection of the mooring system and cables.
France's first commercial offshore wind farm. 80 GE Haliade 150-6MW turbines for a total capacity of 480 MW. We supplied amphibolite armourstone in two consecutive phases (2020 with Van Oord and 2021 with DEME) for scour protection and base armour around the monopile foundations.
First commercial-scale offshore wind farm in the United States. 62 GE Haliade-X turbines of 13 MW each, totalling 806 MW of nameplate capacity. First power was delivered to the New England grid in January 2024. HSS supplied LMA 5/40 amphibolite for scour protection of the foundations.
First submarine electricity interconnection between Spain and France. Two HVDC links of 1,000 MW each (2 GW total) at 400 kV DC, with a total route of ~400 km (300 km submarine). EU Project of Common Interest, sponsored by Inelfe (Red Eléctrica + RTE), with EIB financing of €1.6 bn. HSS processes the existing granite preload in situ at the Outer Port of Ferrol into CE-certified armourstone and aggregates.
Largest offshore wind farm in the United States. 176 Siemens Gamesa SG 14-222 DD turbines totalling 2,587 MW of nameplate capacity, developed and operated by Dominion Energy. Commercial operation scheduled for late 2026. HSS supplies LMA 10/60 light amphibolite armourstone produced at the Lamas-Rapadoiro Quarry, San Sadurniño (A Coruña, Spain), under CE marking.
Offshore wind farm in the German Exclusive Economic Zone of the North Sea, in operation since October 2015. 80 Siemens 3.6 MW turbines with 120 m rotors totalling 302 MW, on monopile foundations in 20 to 25 m of water; it supplies around 300,000 households. HSS supplied LMA 5/40 kg light amphibolite armourstone produced at the Lamas-Rapadoiro Quarry, San Sadurniño (A Coruña, Spain), under CE marking.
Exact breakdown of quantities supplied to each project since 2019.
| Year | Project | Client | Material | Tonnes |
|---|---|---|---|---|
| 2019 | Windfloat Atlantic · Portugal | Tideway | Amphibolite | 114,750 |
| 2020 | Saint-Nazaire OWF · France (phase 1) | Van Oord | Amphibolite | 96,200 |
| 2021 | Saint-Nazaire OWF · France (phase 2) | DEME Group | Amphibolite | 16,500 |
| 2023 | Vineyard Wind 1 · USA | Jan de Nul | Amphibolite | 32,000 |
| 2025-26 | Coastal Virginia OWF · USA | DEME Group | Amphibolite | 65,000 |
| 2025-27 | Biscay Gulf Cable 1 & 2 · ES–FR | DEME / JDN | Granite | 501,350 |
| 2026 | Amrumbank West OWF · Germany | Boskalis | Amphibolite | 13,500 |
| CUMULATIVE TOTAL | 839,300 | |||
Figures in tonnes. Includes material supplied and scheduled to be supplied. All production under CE marking System 2+ (VERUS Certification, ENAC no. 161/C-PR363).
The largest dredging, submarine installation and marine works contractors in the world rely on HSS for the supply of CE-certified armourstone and aggregates.
Request a quotation for CE-certified armourstone and aggregates, with shipping from the Outer Port of Ferrol.
Offshore wind + HVDC interconnections · Since 2019