Technology group Wärtsilä has announced a €90m ($104.7m) investment to expand technical production capacity by 30% at its Sustainable Technology Hub (STH) in Finland, alongside adjustments across its global supply chain.
This new expansion builds on a previous decision made in February 2026 to increase capacity by 35%, bringing the company’s total planned production uplift to 65% compared with its 2025 baseline.
The earlier phase of the expansion is scheduled to come online in the first quarter of 2028, while the additional 30% capacity increase is expected to be operational by the first quarter of 2029.
The added output will enable Wärtsilä to manufacture a higher volume of engines to serve rising demand in both the marine and energy sectors. This demand is being driven by increasing global electricity consumption, the rapid expansion of data centres, tightening decarbonisation regulations, and the growing need for fuel-efficient and fuel-flexible propulsion systems. The investment is also intended to reinforce the company’s global supply chain resilience.
“This investment strengthens our ability to respond to the increasing demand, support our customers’ requirements and reinforce Wärtsilä’s long-term market position, while enhancing our global supply chain. It is an important step on our journey to shape the decarbonisation of marine and energy,” said Håkan Agnevall, President and CEO of Wärtsilä.
The Sustainable Technology Hub, inaugurated in 2022, spans 90,000 square metres and employs more than 3,800 people. It operates as a collaboration centre for Wärtsilä, customers, technology partners and academic institutions, hosting around 1,000 visitors per month. All engine types in the company’s portfolio are produced at the facility, which also includes a training centre and a global remote monitoring hub.
Since the STH concept was introduced in 2018, Wärtsilä has invested more than €490m in the site. This includes €50m for expanded R&D and testing infrastructure in April 2025, an office expansion in early 2026, and €230m allocated to production and supply chain scaling during 2026.
An extension of more than 11,000 square metres, scheduled to open in early 2028, will accommodate the additional capacity. The facility is designed to generate its own electricity and heat, with surplus power fed back into the grid and process heat stored for efficient reuse in building operations, supporting Wärtsilä’s goal of achieving carbon neutrality in its own operations by 2030.
