2026-10-15
- It is reported that Wärtsilä has secured an order to supply a 282 MW onsite power plant for a U.S. data center.
- According to the company, the plant will use 15 Wärtsilä 50SG gas engines, and the customer is an undisclosed major U.S. independent power producer (IPP).
- The order was booked in Wärtsilä’s Q3 2026 order book, with equipment delivery in 2028 and full operation expected in 2029.
- It is Wärtsilä’s seventh U.S. data center order, and its total capacity sold for U.S. data centers now exceeds 3 GW.
Wärtsilä has reportedly won an order to supply a 282 MW gas engine power plant that will provide onsite power to a U.S. data center. According to the company’s release dated 5 October 2026, the customer is a major U.S. independent power producer (IPP) whose name has not been disclosed, and the plant will use 15 Wärtsilä 50SG engines. Equipment delivery is planned for 2028 and full operation for 2029. The data center is said to be yet to be built, and neither its location nor the contract value is known. With grid connection delays and AI-driven demand making power availability a key variable for developers, the order illustrates how engine-based onsite generation is being chosen as a practical option for very large loads.
The project involves building an onsite power plant that will supply electricity to a new U.S. data center independently of the grid. The customer is reported to be a major U.S. IPP, while the identity of the data center operator and the project site have not been disclosed. It is reported that Wärtsilä will supply 15 Wärtsilä 50SG gas engines, the core equipment of the plant.
According to the release, the customer chose an engine-based approach because it can deliver large capacity on an efficient timeline and allows capacity to be expanded in phases as computing demand grows. This fits the pattern in which data center power demand often rises gradually in step with server installation rather than all at once. Because engines are built up from individual units, Wärtsilä’s argument is that capacity can be added step by step.
Wärtsilä cites several features of the 50SG engine: efficient operation in demanding conditions, a closed-loop cooling system that uses very little water compared with traditional condensing power plants, and the ability to convert the engines to run on future fuels. The company describes the benefits to data center developers as reliable supply, scalable capacity and future fuel options.
Risto Paldanius, Vice President, Americas at Wärtsilä Energy, is quoted as saying, in essence, that the U.S. data center market is moving faster than traditional power infrastructure can support. The remark reflects an industry view that expansion of conventional grid infrastructure is not keeping pace with data center demand growth.
Numbers
The key figures of the order are as follows. Capacity is 282 MW, using 15 Wärtsilä 50SG engines. The order was booked in Wärtsilä’s Q3 2026 order book. Equipment delivery is scheduled for 2028 and full operation for 2029. A simple calculation gives an average of roughly 18.8 MW per engine, but this is only an arithmetic average of total capacity divided by engine count, not a confirmed rating of individual engines.
This is reportedly Wärtsilä’s seventh data center order in the U.S., and with it the total capacity sold for U.S. data centers exceeds 3 GW. The contract value, customer name, site and data center operator are not known.
On company scale, Wärtsilä Energy has a track record of 81 GW of power plant capacity in 180 countries, and about 35% of its operating installed base is under service agreements. The group has 17,900 professionals across 199 locations in 78 countries, reported net sales of EUR 6.2 billion in 2025 and is listed on Nasdaq Helsinki, according to the company.
Timeline
- 2026-Q3 — Wärtsilä books the 282 MW order in its order book
- 2026-10-05 — Wärtsilä announces the 282 MW onsite power solution for a U.S. data center
- 2028 — Planned equipment delivery
- 2029 — Planned full operation
Note
Onsite generation refers to placing generation equipment within or adjacent to the load, such as a data center, to supply power directly. Closed-loop cooling circulates cooling water instead of discharging it, which is known to reduce water consumption.