PTSC Thanh Hoa Makes Its Mark on the Offshore Substation – The ‘Heart’ of the Baltica 2 Wind Power Project

At PTSC’s bustling yard in Vung Tau, where massive structures for the Baltica 2 Wind Power Project are nearing completion, a team of engineers and technicians from PTSC Thanh Hoa is entering the most critical phase: the pre-commissioning and commissioning of the Electrical & Instrumentation system. In less than 50 days, the OSS3 offshore substation – one of the project’s four "hearts" – will be officially launched. Ready for its journey to the Baltic Sea, it carries Vietnam’s green energy ambitions to the European market.

The Baltica project site within the PTSC Port area, where four (4) offshore substations (OSS), each with a capacity of 375 MW, are currently under construction.

PTSC Thanh Hoa collaborates with PTSC M&C on a European-scale energy project

The Baltica Offshore Wind Farm (Baltica OWF) is one of the world’s largest offshore wind developments, planned for Polish territorial waters in the Baltic Sea. It will also be Poland’s largest renewable energy project to date. The project is being developed by a joint venture between Poland’s National Energy Group (Polska Grupa Energetyczna – PGE) and Ørsted A/S, a global leader in offshore wind.

Baltica 2, the first phase of the Baltica OWF, has a total capacity of 1.5 GW – enough to supply green energy to approximately 2.4 million Polish households, schools, hospitals, organizations, and businesses.

The OSS3 substation – the "heart" of the Baltica 2 wind farm – collects and converts electrical energy from the wind turbines before transmitting it to the mainland.

Within this overall framework, PTSC Thanh Hoa is honored to be entrusted by the consortium of Semco Maritime and PTSC M&C with the package for pre-commissioning and commissioning of the E&I systems for the OSS3 offshore substation. The scope of work covers the full range of pre-commissioning and commissioning activities, including drawing review, electrical installation and termination, line check, loop check, continuity check, and insulation testing prior to energization of the electrical systems. In addition, PTSC Thanh Hoa collaborates closely with Semco Maritime, PTSC M&C, and key vendors such as Hitachi and Hyundai to carry out site acceptance tests (SAT) and system integration tests (SIT) at the topside for all core systems of the offshore substation. These include power distribution systems, high-voltage and medium-voltage gas-insulated switchgear (HV GIS/MV GIS), transformers, HV shunt reactors, low-voltage and control systems (LV & Control), as well as telecommunication and auxiliary systems, HVAC, and SCADA technology enabling remote monitoring and full automation—ensuring that the “heart” of OSS3 operates safely and in perfect synchronization prior to sail-away.

PTSC Thanh Hoa’s E&I Technicians – thoroughly trained, highly skilled, proactive, professional, and strictly safety-compliant.

Progress in telling figures
As of mid-April 2026, the PTSC Thanh Hoa team, working tirelessly day and night, has achieved results to be proud of. The HV/MV system – the most labor-intensive and complex component, including 275 kV high-voltage testing – has reached 74% completion, far exceeding the PTSC M&C’s expectations. The LV & Control system stands at 42.87%, HVAC at 40.5%, while auxiliary equipment and communication systems are being commissioned according to plan following the handover of the installation site.

PTSC Thanh Hoa electrical technicians perform connections inside the voltage transformer for the high-voltage gas-insulated switchgear (HV GIS) – an advanced switching device using SF₆ gas for insulation and arc quenching.

Steel resolve recognized by the Main Contractor

What truly impressed the Main Contractor was not just the progress figures, but the quality of the workforce PTSC Thanh Hoa mobilized for the project. The entire team – engineers, supervisors, technicians, and craftsmans on OSS3 – brought solid expertise, thorough training, and hands-on experience from major industrial projects. They excelled in the Main Contractor’s quality assessments, meeting the project’s stringent safety and quality requirements. All commissioning equipment and measuring instruments have been inspected, tested, and calibrated to ensure peak readiness before deployment.

PTSC Thanh Hoa staff were commended and received gifts during Toolbox Meetings for their safe work practices and strong sense of responsibility.

Working in a multinational environment alongside experts from Denmark, South Korea, India, and various European countries, the PTSC Thanh Hoa team has demonstrated outstanding international integration across all professional aspects. Their agility, strong learning mindset, and high sense of responsibility have left a lasting impression on partners.

 
A multinational working environment requires personnel to possess strong language proficiency and solid technical expertise in order to work effectively with international experts.

The final stretch – ambition to reach new heights

The remaining two months will be the most demanding phase: all systems must be finalized, integrated, and verified as ready for operation before launch. But given their track record, the PTSC Thanh Hoa team on site is fully confident in maintaining performance, ensuring absolute compliance with Safety – Quality – Schedule, and working alongside PTSC M&C and Semco Maritime to bring the project to a successful close. The journey at Baltica 2 is more than just a project – it is proof of the resilience, ingenuity, and pride of the PTSC Thanh Hoa workforce, and of PTSC Corporation as a whole, on the global energy map.

Nguyen Vo Phuong Thao