Z--Hoover Dam Powerplant Rehabilitate Six (6) 100 MVA

The Department of the Interior, Bureau of Reclamation, issued solicitation 140R3021R0019 for the rehabilitation of six 100 MVA single-phase generator top-up transformers, identified as KN6A and KN8A, at the Hoover Dam Powerplant in Boulder City, Nevada. These transformers feature a 15.5kV low side and a 230kV high side. The project is a 100 percent small business set-aside construction contract with an estimated value between 1,000,000 and 5,000,000 dollars. The primary objective is to extend the operational life of the equipment by 20 or more years through the replacement of bushings, instrumentation, controls, pressure relief devices, DGA monitors, oil pumps, heat exchangers, and conservator components. The contract requires performance to begin within 10 calendar days of award with a total completion period of 360 calendar days. Key administrative and legal requirements include the submission of performance and payment bonds, adherence to Davis-Bacon Act wage determinations for Clark County, and the use of standardized Bureau of Reclamation invoicing and claim release forms. Technical execution involves specific constraints such as 150-ton crane weight limits and scheduled outages during January and February 2022. The procurement process included multiple amendments to extend proposal deadlines and provide clarifications on technical scopes, including rapid tank depressurization and the handling of lead in transformer oil.