Aecon Group Inc. announced that Cascade Nuclear Partners, an equal joint venture comprised of Aecon, Kiewit, and Black & Veatch, is finalizing negotiations with Energy Northwest to collaboratively complete the design, planning and construction of the first four of 12 Xe-100 small modular reactors (SMR) under a progressive design-build model. Developed by X-energy, each Xe-100 SMR is a high-temperature gas-cooled reactor that provides 80 megawatts of electricity. This first phase of the Cascade Advanced Energy Facility will generate up to 320 megawatts through the delivery of four reactor modules and will be located adjacent to Energy Northwest's Columbia Generating Station near Richland, WA.

In October 2024, Energy Northwest announced a multi-year agreement with Amazon focused on comprehensive environmental, safety, permitting, licensing and risk analyses for the first-ever SMR project in eastern Washington. At the completion of this robust analyses, Energy Northwest is expected to submit a construction permit application to the Nuclear Regulatory Commission. Construction is anticipated to begin by the end of the decade, with operations targeted for the 2030s.