Global Shipbuilding Boom Creates Engine Supply Constraints
A familiar constraint from shipping’s last great shipbuilding boom is beginning to reappear: yards are short of engines. The pressure is most visible in dual-fuel low-speed two-stroke engines, where production lines are stretched by a record newbuilding wave and increasingly complex specifications.
Impact on Shipyard Output
Alphaliner has identified the same problem in container shipping, reporting that several mid-sized boxship projects of around 6,000 teu have stalled in recent months because timely main engine building slots could not be secured. Established yards with strong supplier relationships are still securing equipment, while some delays can be absorbed into construction schedules.
However, the constraint is now material enough to affect delivery assumptions. According to Adam Kent, who heads up consultancy Maritime Strategies International, “We’ve certainly heard that the availability of engines is having an impact on some yards, in terms of output. However, I think this is ultimately leading to delays and pushing out deliveries rather than yards not taking orders.”
Auxiliary Diesels and Generator Sets Also Affected
Shipowners have also reported growing difficulty sourcing auxiliary diesels and generator sets, with longer lead times and rising prices. This is where shipping’s equipment cycle has begun to overlap with another global boom: artificial intelligence. Data centres require huge volumes of reliable backup power, often supplied by large industrial diesel or gas generator sets in the 1 MW to 4 MW range.
- Wärtsilä announced a 30% expansion of technical production capacity to meet growing demand from the energy and marine industries.
- Rolls-Royce is increasing production of mtu Series 4000 generator sets in the US to meet record demand from the data centre sector.
- Accelleron delivered a record 8,000 TPX44 turbochargers for data centre and critical infrastructure applications in 2025, more than tripling output year on year.
Competing with AI Infrastructure for Parts
The pressure is visible further down the supply chain, with shipbuilding competing with AI infrastructure for parts of the same industrial power supply chain. Kent said he has read that auxiliary engine manufacturers are favouring data centre sales at premium prices, although he has not heard this directly from owners.
Roar Adland, who heads up research at broker SSY, cautioned that bottlenecks could disappear if incentives are strong enough. Burak Cetinok, Adland’s counterpart at Arrow, argued that longer lead times should not be confused with a systemic shortage.