EEW Special Pipe Constructions is investing tens of millions of euros in its Rostock manufacturing operation to support offshore wind monopiles up to 12 metres in diameter and 3,000 tonnes in weight from the second quarter of 2028.
The programme covers machinery, infrastructure and factory-space optimisation at the Baltic Sea facility. Refurbishment of existing buildings and construction of new facilities are already under way, while EEW has acquired neighbouring industrial land to provide additional raw-material storage.
Further investment is planned through 2027 and 2028. The company is also discussing longer-term expansion with regional and port authorities as future offshore turbines may require monopile foundations approaching 15 metres in diameter after 2030.
The latest investment reflects how quickly foundation dimensions have changed. EEW began manufacturing monopiles at Rostock in 2008, when the largest units were around six metres in diameter. Increases in offshore turbine rating have since transferred substantially greater loads into towers and foundations, forcing manufacturers to enlarge almost every stage of the fabrication process.
A monopile starts with heavy steel plate that is rolled into cylindrical sections, welded longitudinally and then joined into progressively larger cans. Those sections have to maintain demanding dimensional and weld-quality tolerances even as diameter, wall thickness and individual unit mass increase.
Moving from one generation of foundation to the next therefore affects more than the plate roller. Welding stations, cranes, internal transport, inspection equipment, hall clearances and storage areas all have to accommodate larger components, while the quay and handling systems must be capable of transferring completed foundations onto installation vessels.
Unit weights approaching 3,000 tonnes make material flow a major part of the factory design. A component of that scale cannot simply be moved to one side if another production process falls behind. Production sequencing has to account for where each section can be stored and how it will move through welding, inspection, coating and final load-out.
EEW’s location directly at the Port of Rostock is therefore an industrial advantage. Finished foundations can be transferred to vessels without road transport, avoiding one of the largest logistical constraints associated with oversized offshore wind structures.
The company also provides secondary steel, corrosion protection and logistics support around its primary foundation products. Combining those activities near the quay allows more preparation to be completed before a monopile enters the installation campaign offshore.
Technical managing director Sascha Hofmeister said the investment is intended to strengthen European value creation and security of supply. EEW argues that European manufacturers can supply the foundation capacity required for regional offshore-wind expansion without creating an unnecessary dependence on imported monopiles.
That issue is becoming more prominent as European policy moves beyond renewable-generation targets and towards the industrial capability required to deliver them. Offshore wind projects depend on steelmaking, foundation fabrication, cables, substations, installation vessels and port capacity, several of which face long investment lead times.
Foundation manufacturing is particularly capital intensive. Large rolling and welding equipment cannot be added quickly once a wind-farm developer places an order, meaning suppliers have to invest ahead of confirmed demand if they expect turbine dimensions to continue rising.
EEW is already considering that next step. Commercial managing director Robert Dreves has said future turbines could require foundation diameters of up to 15 metres, prompting discussions with the City of Rostock, state authorities and the port over possible further expansion from 2030.
That planning horizon shows how production decisions are now being driven by turbine designs that may not yet have entered serial manufacture. Larger turbines can reduce the number of machines needed to deliver a given wind-farm capacity, but their scale moves complexity into foundations, installation vessels and ports.
There is an economic limit to that progression. Each increase in monopile diameter requires more steel, heavier equipment and greater handling capacity, while soil conditions and water depth can make alternative foundation concepts more attractive for some projects. Manufacturers therefore have to expand without assuming that every future offshore development will use the largest technically possible monopile.
Rostock already operates at substantial industrial scale. EEW’s live facility information lists approximately 1,000 employees, 32,000 square metres of production space and more than 2,600 monopiles produced since the operation was established.
Public information currently gives conflicting descriptions of the plant’s precise present-day capacity. EEW’s live facility page describes 12-metre monopiles as an existing capability and lists 250,000 tonnes of annual production capacity, while the dated 15 September expansion statement says the investment will enable 12-metre, 3,000-tonne production from the second quarter of 2028 and contemporary reporting of that statement gives normal annual capacity as 200,000 tonnes.
The expansion announcement is the appropriate basis for the forward programme, while the conflicting current-state figures require clarification before publication of a precise baseline capacity. The industrial direction is unaffected: EEW is spending tens of millions of euros on additional equipment, space and infrastructure to handle a larger generation of offshore foundations.
Its first major construction steps are due to complete in early 2027, with further investment continuing into 2028. By the time the announced 12-metre capability is fully available under the programme, planning may already be under way for the next factory configuration. Offshore wind’s scale race has moved from turbines into the plants that manufacture the structures beneath them.
