Wärtsilä has signed a $100 million contract to deliver six dual-fuel engines totaling nearly 100 MW for a new power facility in Rapid City, South Dakota. The project, commissioned by Black Hills Energy, reflects a growing industry move toward flexible power generation—technology that can respond quickly to shifting demand and adapt to uncertain fuel supplies.
The six engines will allow the utility to run on either natural gas or an alternative fuel, a critical feature in a region where cold weather can disrupt gas availability. This added flexibility is increasingly seen as essential for ensuring grid stability, especially during peak heating seasons or in areas with aging infrastructure.
Beyond its dual-fuel capabilities, the plant’s fast-track development—targeting completion by late 2026—responds to mounting pressure on utilities to replace older units while meeting system reliability requirements. The combination of quick deployment, fast-ramping response, and fuel-switching options made Wärtsilä’s technology a fit for the region’s challenges.
As utilities across North America work to decarbonize while maintaining service reliability, flexible reciprocating engines are emerging as a key bridge technology. These systems can ramp up quickly when renewables like wind or solar drop off, helping balance the intermittency that comes with a growing share of renewable power.
The deal is part of a wider trend of utilities turning to flexible solutions that support renewable integration without compromising on performance.
