en.Wedoany.com Reported - Poland's first grid node specifically designed for offshore wind energy, the Choczewo 400 kV substation, is under construction in Osieki Lęborskie. By December 2025, the site was ready to receive power from the first offshore wind farms; by May 2026, the substation provided auxiliary power to the Baltic Power substation, enabling its commissioning and connection to the national grid. This project is invested by Polskie Sieci Elektroenergetyczne (PSE) and delivered by a consortium of SPIE Energy Poland and Elfeko, with overall completion expected in 2027.
The substation covers 25 hectares and includes 6 km of cable ducts, over 2,000 foundations, 1,100 tons of steel structures, nearly 20 km of tubular busbars, and more than 250 km of control cables. On-site installations also include over 5 km of internal roads, approximately 500 lighting poles, two technical buildings with a total floor area exceeding 1,500 square meters, and a 6,000 cubic meter rainwater retention tank. Advanced commissioning involves 400 kV switchgear bays and substation protection systems. For the first time in the Polish industry, this project uses a power transformer to supply the substation's auxiliary systems, replacing traditional auxiliary transformers. Cybersecurity measures comply with the EU NIS 2 Directive. Landscaping, micro-grading, and vegetation restoration are underway to rehabilitate the site and harmonize it with the surrounding environment.
The project extensively utilizes Polish suppliers, particularly from the Pomerania region, and is expected to boost local tax revenue, infrastructure, and employment. A dedicated drainage system was designed for the complex terrain. A five-month archaeological study unearthed face-urn cremation vessels dating back approximately 2,500 years. The project plan also includes future connections for energy storage facilities and data processing centers to enhance grid flexibility.
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