750 KVA Three Phase 60 Hertz, Onan, Subway-Type Network Transformers

Six 750 kVA three-phase 60 Hz ONAN subway-type network transformers are being procured by Nashville Electric Service under solicitation Z4381 with a submission deadline of May 11, 2026. Each transformer must have a high-voltage rating of 13,750 volts delta with four taps—two at +2.5% and two at -2.5% of rated voltage—and a low-voltage output of 277/480 volts without taps. The units must include a three-position high-voltage disconnect and ground switch in a single compartment, an exception to NES Specification ET-258-12 Section 5.3. All equipment must comply with the latest version of NES ET-258-12 and meet or exceed the U.S. Department of Energy’s 2016 minimum efficiency standards. Only transformers manufactured by Pioneer, Genelec, ABB, or Auto Car are acceptable, and no alternate brands may be submitted. Each transformer must be equipped with a permanent Uticom ID tag on the primary bushing, marked with the stock number, serial number, manufacturer, and impedance percentage using indelible ink, and the nameplate must clearly identify the type of insulating oil used. Actual excitation and total loss data from the manufacturer must be provided with or prior to shipment; estimated values are not acceptable. Bids must be submitted electronically via the NES Vendor Web Portal by 2:00 PM local time on the deadline date, and delivery is required to Nashville, Tennessee, at 1214 Church St., 37246. Inspection and acceptance will occur at the place of performance, and any non-compliant units will be rejected. The solicitation is structured as a competitive fixed-price procurement, with technical compliance and loss data accuracy as critical evaluation factors, suggesting an LPTA methodology. No federal contract clauses are referenced, no socioeconomic or size certifications are required, and pricing details are not provided as they are to be submitted by vendors.