Wärtsilä deploys 282 MW of onsite power generation for data centers as electricity demand outpaces grid supply in key markets.

Onsite power generation is emerging as a solution for U.S. data center developers facing electricity constraints as demand from artificial intelligence and other computing workloads grows faster than traditional grid infrastructure can support.

Wärtsilä has secured an order to supply 15 Wärtsilä 50SG engines for a 282-megawatt onsite power project at a U.S. data center being developed by a major independent power producer. 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 conventional grid connections. 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.

Data center developers are increasingly turning to onsite generation as they encounter limited grid capacity and lengthy interconnection timelines. Large AI facilities can require hundreds of megawatts of power, creating a need for generation and electrical infrastructure that can be deployed alongside computing facilities. This approach provides an alternative path to securing power while utilities and developers work to expand the broader power system through new generation, transmission lines and substations—infrastructure projects that often require extensive development and permitting periods.

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 and can be converted to operate on future fuels, providing additional flexibility over the facility's operating life.

This is Wärtsilä's seventh data center-related project in the United States, with cumulative capacity sold for U.S. data center applications now exceeding 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 282 MW project 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 designed to serve a specific computing project.

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. Equipment deliveries are scheduled to begin in 2028, with the onsite power facility expected to become fully operational in 2029.