Onsite power generation is emerging as a way for U.S. data center developers to address electricity constraints as demand from artificial intelligence and other computing workloads grows faster than traditional grid infrastructure.
The latest example is a 282-megawatt onsite power project planned for a U.S. data center being developed by a major independent power producer.
Wärtsilä has secured the order to supply 15 Wärtsilä 50SG engines for the project. The company booked the order in the third quarter of 2026, with equipment deliveries scheduled for 2028 and full operation expected in 2029.
The customer and project location have not been disclosed.
The generation facility will provide dedicated power to the data center rather than relying entirely on a conventional grid connection. Wärtsilä said the customer selected the engine-based system to secure large-scale power on an accelerated timeline while allowing the facility to expand as computing demand increases.
That approach is becoming more relevant as data center developers encounter limited grid capacity and lengthy interconnection timelines. Large AI facilities can require hundreds of megawatts. Creating a need for generation and electrical infrastructure that can be delivered alongside the computing facilities.
The 15 Wärtsilä 50SG engines will form the core of the onsite generation plant. The platform uses a closed-loop cooling system designed to reduce water consumption compared with conventional thermal power generation.
The engines can also be converted to operate on future fuels, giving the plant additional flexibility over its operating life.
Latest Wärtsilä U.S. order
The latest order is Wärtsilä’s seventh data center-related project in the United States. The company said its cumulative capacity sold for U.S. data center applications has now surpassed 3 gigawatts.
Risto Paldanius, vice president for the Americas at Wärtsilä Energy, said the U.S. data center market is “moving faster than traditional power infrastructure can support.”
The shift toward onsite generation comes as utilities and developers work to expand the broader power system needed to support data center growth. New generation, transmission lines and substations can require lengthy development and permitting periods.
For some projects, onsite generation can provide a separate path to securing power while those larger infrastructure investments move forward.
The 282 MW project also illustrates the scale of power infrastructure now being paired with individual data center developments. The generation capacity alone is comparable to a large power plant, even though the facility is being designed to serve a specific computing project.
Wärtsilä has not disclosed the data center’s location, development cost, construction contractors or the identity of the independent power producer.
Equipment deliveries are scheduled to begin in 2028, with the onsite power facility expected to become fully operational in 2029.
Additionally, the race to add power for new data centers is also prompting investment in existing nuclear generation. Vistra is set to receive $4.2 billion in federal financing to support uprates at three nuclear plants in the PJM market, a separate effort to bring additional electricity capacity to a grid facing growing demand.
Project factsheet: Onsite power facility for a U.S. data center
- Power capacity: 282 MW
- Generation equipment: 15 Wärtsilä 50SG engines
- Customer: Major U.S. independent power producer
- Location: Not disclosed
- Order booked: Q3 2026
- Equipment delivery: 2028
- Expected operation: 2029
- Wärtsilä U.S. data center orders: Seventh project
- Total U.S. data center capacity sold by Wärtsilä: More than 3 GW
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