Nathaniel "Nat" Washington Power Plant GSU Transformer Replacements

The Department of the Interior Bureau of Reclamation is conducting market research for the supply and installation of six single-phase, outdoor, Class II generator step-up (GSU) power transformers at the Nathaniel "Nat" Washington Power Plant at Grand Coulee Dam in Washington. The transformers must have a capacity of 165/220/276 MVA, utilize synthetic ester insulating fluid, and meet specific technical requirements including a 310.687 kV high side voltage, 15 kV low side voltage, and 1675 BIL winding rating. Key qualifications for interested contractors include demonstrated experience with similar transformer projects valued at a minimum of $8 million completed at least 75 percent within the last ten years, established relationships with transformer manufacturers, bonding capacity, and compliance with Buy American Act requirements. The government is seeking responses that address organizational capabilities, transformer manufacturing details including country of origin, estimated manufacturer lead times based on an October 10, 2027 Notice to Proceed date, market volatility assessments with Economic Price Adjustment recommendations, and technical input on two alternatives regarding insulating fluid specifications. Responses are due by 5 p.m. Mountain Time on March 12, 2026, and should be submitted to Contracting Officer Colby Clifford and Contract Specialist Drew McGuire.

This pre-solicitation notice uses no set-aside designations and does not identify any incumbent contractors. The estimated contract value exceeds $150 million, representing a significant construction and supply effort with an anticipated contract award in fiscal year 2026. The project scope includes supplying and installing six new GSU transformers, removing and disposing of three in-service and four spare transformers, relocating three transformers to spare locations, and modifying existing isolated phase bus connections. Work is planned to occur over two separate outage periods, with the anticipated execution window spanning from September through March across consecutive years. The contract is expected to be a hybrid firm fixed-price arrangement for both construction and supply components, and may be subject to Project Labor Agreement requirements under Executive Order 14063. Additionally, contractors must meet small business subcontracting goals including 42 percent for small business and 10 percent for small disadvantaged business participation.