The Baltica offshore wind farm is being developed in the Baltic Sea, offshore Poland. It will be the largest offshore wind farm in the Baltic Sea.
The project includes two development phases: Baltica 2, with a capacity of 1.5GW; and Baltica 3, with a capacity of 1GW.
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A 50:50 joint venture partnership between offshore wind energy producer Orsted and Polska Grupa Energetyczna (PGE), Poland’s largest electricity and heat production company, is developing the project.
The final investment decision for the Baltica 2 wind farm was taken in January 2025. Offshore installation began in May 2026, and the monopile installation was completed in August of the same year.
Baltica 2 is set to go online in 2027 and supply green energy for 2.4 million households, while reducing CO2 emissions by five million tonnes a year.
The project benefits from a 25-year, inflation-indexed contract for difference with the Polish government.
Baltica 3 is set to be up and running by 2029. The service life of Baltica 3 is scheduled to end in 2056, while that of Baltica 2 is projected to end in 2057.
Baltica offshore wind farm location
The Baltica offshore wind farm is being developed offshore Ustka, in the Polish region of the Baltic Sea.
The Baltica 2 development will cover an area of approximately 190km², while Baltica 3 will cover approximately 130km².
A minimum distance of 25km will be maintained between the closest wind turbines and the shore.
The onshore infrastructure for the wind farm will be built in the Choczewo commune, which will provide the necessary land infrastructure for its operation.
Baltica offshore wind farm details
Baltica 2 will be installed with 107 units of SG 14-222 DD turbines mounted on steel monopile foundations embedded directly into the seabed. The largest monopile exceeds 100m (328ft) in length, 9.5–10m in diameter and weighs nearly 1,900t.
The SG 14-222 DD turbine has a maximum capacity of 15MW with power boost. The turbine has a rotor diameter of 222m, with 108m-long blades resulting in a blade sweep area of 39,000m². The turbine is suitable for all wind speeds.
The project includes the installation of four offshore substations. Each substation will be equipped with two transformers rated at 225MV-amperes each and feature five deck levels, measuring roughly 45m × 25m × 20m, with an estimated weight of 3,000t. The first transformer of one of the substations was installed in October 2025.
The wind turbines will be connected to the offshore substations through 66kV subsea array cables totalling 170km in length.
The power generated from Baltica 2 and 3 will be exported from the offshore substations to the onshore station by a combined cable corridor, comprising four 275kV export cables with cross-linked polyethylene (XLPE) insulation with a combined length of approximately 300km.
Baltica 3 is expected to be installed with up to 80 turbines located 25km from the nearest shoreline.
Grid connection
A 275/400kV high-voltage substation and onshore underground export lines will deliver the power generated by the Baltica 2 wind farm to the Polish power system.
The onshore substation will be built in Osieki Lęborskie in the Choczewo municipality in Pomerania on a 13-hectare (32-acre) site. It will be equipped with gas insulated switchgear, transformers and static synchronous compensators.
Electricity generated by the offshore wind farm will be delivered to the onshore substation by the export cables. Once the cables make landfall, the power will be carried to the onshore transformer station via a 6km, 275kV cable link.
The voltage will then be stepped up to 400kV before being exported to the national grid through the adjacent Polish transmission system operator, PSE’s Choczewo substation.
Financing
PGE is covering its share of the project under a project finance structure, having secured debt funding from 24 domestic and international lenders, among them the European Investment Bank and the European Bank for Reconstruction and Development.
Around $1.48bn (6bn zlotys) is expected to be provided as loans from Bank Gospodarstwa Krajowego, including 5.5bn zlotys sourced from the National Recovery Plan.
Orsted is funding its portion of the investment from its own balance sheet.
Contractors involved in the Baltica offshore wind project
A consortium comprising Ramboll Polska and Projmors Maritime Construction Design Office was appointed to deliver a design package for the foundations, wind turbines, inter-array cabling and offshore substations; secure the required construction consent; and develop the detailed technical design for the Baltica 2 wind farm.In April 2023, Siemens Gamesa won the contract to supply wind turbines for Baltica 2. The company also entered a maintenance agreement for a period of five years for the project.
EEW delivered 77 monopile foundations for the Baltica 2 project, while Steelwind Nordenham delivered 34 monopile foundations.
Van Oord was contracted for the transport and installation of the monopiles for the wind turbines and the offshore substations using its Svanen and Aeolus offshore installation vessels in a dual-vessel approach.
Cadeler and Fred. Olsen Windcarrier are responsible for the transportation and installation of the wind turbines.
Marine export cables will be supplied by ZTT Submarine Cable & System and Hellenic Cables. Orient Cable is supplying 170km of 66kV subsea array cables.
A consortium of Semco Maritime and PTSC Mechanical & Construction, supported by primary sub-contractors ISC Consulting Engineers and Hyundai Electric, was awarded the engineering, procurement and construction contract for the four offshore substations. The contractual scope includes the design, procurement and installation of high and medium-voltage, supervisory control and data acquisition and auxiliary systems for the substations.
Seaway7 was contracted for the transport and installation of the four offshore substations, while Boskalis was chosen as the cable installation contractor.
GE Vernova and Polimex Mostostal were selected as the general contractor to build the onshore electrical connection, including the onshore substation, for the Baltica 2 project, while Enprom was selected to commission the substation.
RockWave, Geoquip Marine, MEWO, Green Giraffe Advisory and Palfinger Marine, as well as Protea, Grupa Przemysłowa Baltic (Baltic Industrial Group), Etermar, Smulders, ROMGOS Gwiazdowscy and ZRB Janicki, are also involved in the Baltica 2 wind project. DNV, Ayesa Engineering, Biuro Studiow, Projektow i Realizacji Energoprojekt-Katowice and Energopomiar are also contributing their services.
Baltica 1 details
Baltica 1 will have an installed capacity of 900MW and is being developed separately by PGE Group. The project is expected to be launched in 2030 after the completion of Baltica 2 and 3.
Baltica 1 will be located north of the Baltica 2 and Baltica 3 projects and 80km from the Polish shore. Environmental survey works for Baltica 1 were launched in September 2022. The project already has a location permit and a connection agreement in place.
