COB Addendum Substation upgrades Transformer purchase.pdf

This is an addendum to a Request for Bid issued by the City of Batavia, Illinois, for the NE & SE Substation Upgrades Transformer Purchase project, prepared by BHMG Engineers, Inc. The procurement requires one 138kV to 34.5kV power transformer with an On-Load Tap Changer (OLTC). The project specifications mandate compliance with the National Electric Code, National Electrical Manufacturers Association standards, ANSI standards, IEEE standards, and prevailing state and local electrical codes, with materials bearing UL labels where possible. The bid due date was revised from its original date to October 15, 2026, with the time and location of submission remaining unchanged.

The addendum clarifies that Vapor Phase Drying is the preferred drying method for the transformer; however, bidders may propose alternative drying methods if their proposed product and overall bid remain competitive in other areas. All materials, sizes, and capacities must conform to referenced IEEE standards including C57.12.00 for General Requirements for Liquid-Immersed Distribution, Power and Regulating Transformers; C57.12.10 for Safety Requirements; C57.12.28 for Coating System Requirements; C57.12.70 for Terminal Markings and Connections; and C57.12.90 for Standard Test Code, as well as NEMA TP 80050-2013 (R2024) for Transformers, Step Voltage Regulators, and Reactors. Bidders must confirm receipt of the addendum by signature and company name via email to awooldridge@bhmg.com.