The nacelle supply bottleneck is threatening Europe’s offshore wind ambitions

Nacelle manufacturing is the most constrained segment of the offshore wind supply chain under the current outlook. For developers, investors, and OEMs planning through 2030, it is important to understand the potential bottleneck in order to successfully navigate it. Here, Spinergie’s Senior Offshore Wind Analyst, Maëlig Gaborieau, explains the reasons behind the shortfall. 

Spinergie’s Q2 Offshore Wind Installation Forecast estimated that the available nacelle supply is expected to reach 619 units for 2030. This is based on disclosed capacity from Western manufacturers and is reflective of existing facilities operated by Siemens Gamesa, Vestas, and GE Vernova. 

‍The nacelle supply bottleneck

A nacelle supply bottleneck is already visible with supply falling short of demand. Issues in ramping up at existing nacelle factories is delaying projects in the North and Baltic seas,  effectively locking part of the project pipeline behind manufacturing constraints. As the decade progresses, the gap will widen closer to 2030, where a significant share of demand will become infeasible. 

Nacelle production offers limited short-term flexibility. Assembly lines require long lead times, skilled labour, and firm order commitments to justify investment. This bottleneck compounds installation vessel constraints and represents an additional, near-term constraint. In real terms it means that even for mature projects where installation assets are available, insufficient nacelle supply could prevent execution. 

The nacelle supply/demand imbalance is expected to persist beyond 2030, even as the project pipeline is reduced. This acts as confirmation that nacelle manufacturing capacity did not scale with deployment ambitions. 

‍Constrained nacelle supply in a duopolistic landscape 

Two recent developments have reshaped the outlook for nacelle manufacturing in Europe. In the UK, Mingyang’s planned nacelle factory was cancelled, removing a potential source of additional capacity and market diversification. Shortly after, Vestas announced plans for a new nacelle assembly facility in the UK—following earlier news of the commissioning of a facility in Szczecin, Poland. However, this UK project remains conditional on secured project pipelines and long-term demand visibility. 

This evolving landscape is further defined by the absence of new developments from GE Vernova in offshore nacelle manufacturing. In contrast, Siemens Gamesa and Vestas continue to dominate both installed capacity and future project pipelines. The result is an increasingly concentrated market structure, with a duopoly taking shape across European nacelle supply.

At the same time, demand trajectories point toward a structural undersupply. European offshore wind targets imply the installation of several hundred turbines per year over the next decade, yet manufacturing capacity expansion remains slow and conditional. In this context, Siemens Gamesa and Vestas effectively control production volumes, delivery schedules, and pricing. This concentration shifts negotiating power toward OEMs, with direct implications for turbine costs and contractual terms. Indeed, limited nacelle availability is already impacting projects including He Dreiht and Baltic Power. 

Policy developments reinforce these dynamics. Chinese manufacturers offer lower-cost alternatives and have reached increasing levels of technological maturity. However, their access to the European market is becoming more constrained. The cancellation of Mingyang’s UK factory reflects a broader tightening of market access, while tender frameworks across Europe increasingly include local content requirements and criteria that limit participation from non-European suppliers. These measures reduce the likelihood of additional supply entering the market at a meaningful scale.

Nacelle manufacturing is therefore emerging as a central constraint in Europe’s offshore wind expansion. Without sustained investment in new capacity, supported by stable demand signals and credible project pipelines, supply limitations are expected to persist. Under these conditions, a concentrated group of OEMs will continue to shape both the pace and cost structure of offshore wind deployment in Europe.

‍The nacelle analysis in this article draws from Spinergie's quarterly Offshore Wind Installation Forecast. This report confronts heavy-lift vessel and factory supply directly against demand, giving operators, planners, and investors the strategic intelligence to act ahead of constraints. The report is available to buy directly, or is available to subscribers via the Spinergie Market Intelligence app. Click here to find out more.