NOAA intends to negotiate a sole source purchase order with Proton Energy Systems for HOGEN Series 3 replacement generators, with delivery to the National Logistics Support Center in Grandview, MO. The sole source justification is based on standardization with the existing Proton/NEL S20 hydrogen generator platform used at National Weather Service upper-air stations, including physical compatibility with current facilities. It also cites embedded control software and trained Sterling Field Support Center personnel as critical for