SPIE Energy Poland leads 400 kV Choczewo substation to connect offshore wind
- In May 2026 the Choczewo substation supplied auxiliary power to the Baltic Power substation, enabling its commissioning and grid connection.
- The project investor is Polskie Sieci Elektroenergetyczne (PSE); delivery is by a consortium of SPIE Energy Poland and Elfeko, with completion scheduled for 2027.
- Infrastructure includes 25 ha site area, 6 km of cable ducts, >2,000 foundations, 1,100 t of steel, ~20 km of tubular busbars and >250 km of control cables.
- The investment is co‑financed by the National Recovery Plan; station design uses transformers for auxiliary power and implements cybersecurity measures compliant with the EU NIS 2 Directive.
Project status
The Choczewo 400 kV substation in Osieki Lęborskie is under construction as the first Polish grid node designed for offshore wind. In December 2025 the site was cleared to receive electricity from the first offshore farms; in May 2026 the substation supplied auxiliary power to the Baltic Power substation, enabling its commissioning and connection to the national grid. The investor is Polskie Sieci Elektroenergetyczne (PSE); delivery is by a consortium of SPIE Energy Poland and Elfeko. Full project completion is scheduled for 2027.
Technical scope
The site covers 25 hectares and includes 6 km of cable ducts, more than 2,000 foundations, 1,100 tonnes of steel structures, nearly 20 km of tubular busbars and over 250 km of control cables. Installations also comprise more than 5 km of internal roads, ~500 lighting columns, two technical buildings totaling over 1,500 m², and a 6,000 m³ stormwater retention basin. Advanced commissioning includes the 400 kV switchgear bays and station protection systems.
Operations and resilience
For the first time in the Polish sector, electrical transformers are used to power the substation’s auxiliary systems, avoiding a conventional auxiliary transformer. Cybersecurity measures meet the European NIS 2 Directive. Landscaping, micro‑leveling and revegetation works are under way to restore and integrate the site visually.
Socio‑economic and environmental aspects
The project relies heavily on Polish suppliers, particularly in Pomerania, and is expected to boost local tax revenues, infrastructure and jobs. A specific drainage system was designed for difficult terrain; five months of archaeological research recovered face‑ornamented urns dated to about 2,500 years ago. Plans provide for future connection of an energy storage facility and a data processing centre to increase grid flexibility.
Source: SPIE
