1412175446 Addendum 4.pdf

This is Addendum 4 to an RFP issued by the Procurement Department of JEA (Jacksonville Electric Authority) in Florida for the procurement of Unit Auxiliary Transformers (UATs) for the St. Johns River Power Park (SJRPP) Unit 3 Combined Cycle project. The solicitation seeks two Combustion Turbine Generator (CTG) UATs and two Steam Turbine Generator (STG) UATs. The original response due date was June 23, 2026, which was extended to July 14, 2026, with responses due by 12:00 PM EST. An optional pre-response meeting was scheduled for May 26, 2026, at 3:00 PM. The effective date for submittals is defined as the EPC LNTP (Engineering, Procurement, and Construction Lump-Sum Turnkey) date of February 2027, unless mutually agreed otherwise in writing by both parties.

Addendum 4 addresses technical clarifications regarding the transformers' impedance specifications and updates the list of approved manufacturers. In response to a bidder inquiry, JEA confirmed that the 18% impedance shown on the Power Transformer Data Sheet (lines 18 and 19, page 7 of the Technical Specification) is correct and suitable as designed. Under normal operating conditions, the two UATs will operate in parallel with a combined operating impedance of 9%. JEA's engineering analysis, conducted through ETAP modeling and reviewed by BV, confirmed that the impedance was selected to balance short-circuit currents with voltage drop conditions and remains suitable even in worst-case scenarios with one UAT out of service. Additionally, JEA revised Attachment C, the "All Approved Transformer Manufacturers" document, which is referenced in a separate accompanying document.