Boskalis & Allseas Win €1.2 Billion Contract to Build Taiwan’s Second Yongan–Tongxiao Offshore Gas Pipeline

Boskalis & Allseas Win €1.2 Billion Contract to Build Taiwan’s Second Yongan–Tongxiao Offshore Gas Pipeline

(IN BRIEF) Boskalis and Allseas have formed a 50/50 consortium that will deliver CPC Corporation Taiwan’s second offshore gas pipeline, YT2, valued at approximately €1.2 billion. The project entails designing, constructing, installing and pre‑commissioning a 232 km, 36‑inch pipeline running parallel to the existing YT1 route between the Yongan LNG terminal and the Tongxiao transfer station. Key activities include seabed trenching, crossing 34 pieces of infrastructure, backfilling and executing two landfalls. Boskalis will handle landfalls, microtunnelling, trenching, backfilling and rock placement using specialized dredging and rock‑installation vessels. Allseas will perform the pipeline lay and pre‑commissioning—complete with concrete mattress deployment—using its state‑of‑the‑art pipelay ships. Scheduled from 2026 to 2028, the project will strengthen Taiwan’s energy transition and ensure a more robust natural gas supply in the north.

(PRESS RELEASE) PAPENDRECHT, 29-Jul-2025 — /EuropaWire/ — Boskalis and Allseas are delighted to confirm that their evenly split joint venture has secured a major contract from CPC Corporation Taiwan to build the YT2 offshore gas pipeline from Yongan to Tongxiao. Valued at around €1.2 billion, this strategic endeavour will bolster Taiwan’s energy transition efforts and enhance northern Taiwan’s gas delivery capacity.

The agreement tasks the consortium with the full lifecycle of the new 36‑inch YT2 pipeline—design, construction, installation and pre‑commissioning—along a 232‑kilometre route paralleling the existing YT1 line. The comprehensive work package comprises seabed trenching, laying the pipeline across 34 crossings of current and planned infrastructure, backfilling operations and two shore landfalls.

Within the partnership, Boskalis will oversee the two onshore landfalls and execute microtunnelling, as well as handle near‑ and offshore trenching, backfilling, and the placement of rock protections at each crossing. To accomplish these tasks, Boskalis will deploy two large hopper dredgers, a heavy backhoe dredger and a subsea rock‑installation vessel.

Allseas will be responsible for the main pipeline laying and its pre‑commissioning, including the pre‑lay deployment of concrete mattresses to stabilise the seabed. For these operations, Allseas will utilize two of its most advanced pipelay vessels.

This award underscores both companies’ dedication to advancing critical offshore energy infrastructure and reinforces their leading positions in the global marine engineering sector. By collaborating closely with CPC Corporation Taiwan, the consortium will play a pivotal role in securing a reliable and resilient natural gas supply for the region.

Project work is slated to begin in 2026, with hand‑over and completion expected by 2028.

About Boskalis
Boskalis is a leading global services provider operating in the dredging, maritime infrastructure and maritime services sectors. The company provides creative and innovative all-round solutions to infrastructural challenges in the maritime, coastal and delta regions of the world. With core activities such as coastal defense, riverbank protection and land reclamation Boskalis is able to provide adaptive and mitigating solutions to combat the effects of climate change, such as extreme weather conditions and rising sea levels, as well as delivering solutions for the increasing need for space in coastal and delta regions across the world. The company facilitates the development of offshore energy infrastructure, including renewable wind energy. Boskalis is furthermore active in the construction and maintenance of ports, waterways, access channels and civil infrastructure, thus helping to facilitate trade flows and regional socio-economic development. In addition, Boskalis is a global marine salvage expert and provides terminal services at various locations worldwide. With a versatile fleet of approximately 500 vessels and floating equipment and over 11,000 employees, Boskalis is creating new horizons around the world.

About Allseas
Allseas is a family-owned global offshore contractor specializing in pipelay, subsea construction, and ultra-heavy lift. Since 1985, they have led the offshore energy market through bold innovation, consistently pushing technical boundaries to deliver pioneering, responsible solutions that evolve with the changing energy industry. By delivering cutting-edge solutions to the industry’s toughest challenges, learning fast and sharing knowledge, Allseas redefines what is possible above and below the water’s surface, and seizes market opportunities that drive sustainable growth, leveraging engineering expertise to develop technologies that will play a key role in accelerating the energy transition.

This press release can also be found on our website www.boskalis.com.

Media Contact:

Martijn L.D. Schuttevâer
email: press@boskalis.com
Tel: +31 786969310

SOURCE: Boskalis