Refurbishment of Existing On Load Tap Changer at Adobe Creek Substation - AC21

The City of Palo Alto is seeking a qualified electrical contractor to refurbish the existing On‑Load Tap Changer (OLTC) at the Adobe Creek Substation (AC‑21). The work includes complete removal, oil handling, replacement of the TLH‑21 LTC with a certified remanufactured unit, sealing, radiator and valve repairs, oil processing, and comprehensive testing before and after the rebuild (TTR, Power Factor, SFRA, DGA, etc.). The contractor must provide all labor, equipment, materials, and certifications, comply with California prevailing‑wage and DIR registration requirements, and furnish performance and payment bonds equal to 100 % of the contract sum. • Replace and re‑gasket the OLTC (TLH‑21) and associated radiators, valves, and seals. • Drain and re‑use transformer oil (≈ 760 gal from LTC, ≈ 4,348 gal from main tank). • Perform extensive pre‑ and post‑work electrical and mechanical testing (TTR, Power Factor, SFRA, DGA, winding resistance, etc.). • City supplies de‑energizing, isolation, grounding, and disposal of non‑re‑usable oil. • Mandatory compliance with California Labor Code, prevailing‑wage rates, and DIR contractor registration. • Bid submission electronically via OpenGov portal; pre‑bid conference (non‑mandatory) on Oct 26, 2026.