Shuffling the Deck for Reliability [VIDEO]
The Transformer Shuffle aims to maximize Jefferson PUD’s energy load while making big steps forward in county growth areas.
In May, Phase 1 of the PUD’s “Transformer Shuffle” was completed with the installation of a new 118,000-pound, 20MW transformer at the Quilcene Substation. This upgrade replaces the previous
5MW transformer, which served much of south county—from Quilcene to Coyle and north to SR 104.
Why the swap? It’s all about proper load distribution. Peak loads, which occur during high usage in the winter months, can place excessive strain on a transformer, possibly leading to voltage concerns and the need to re-distribute load to other substations. This was the case with the smaller Quilcene substation transformer.
With continued growth in the area, the new transformer will provide 4X the capacity to help reduce strain on the system during peak demand and improve reliability. It also frees up the 5MW unit for use elsewhere.
Phase 2 – Discovery Bay Substation
In June, the 5MW transformer from Quilcene will be installed at the Discovery Bay Substation, replacing the current 20MW unit. Since energy demand in the Discovery Bay-to-Gardiner area rarely exceeds 3MW, the 
smaller transformer is a better match for the local load, improving overall system efficiency.
Phase 3 – Dana Roberts Substation
The 20MW transformer from Discovery Bay will be relocated to the Dana Roberts Substation. This move will coincide with the completion of a second transformer bay, which includes installation of new steel buswork, additional voltage regulators, and expanded control systems.
Once complete, the upgraded bay will enhance peak load management and provide flexibility for future demands—including the possibility of an electrified ferry and a proposed battery storage project. It will also ease equipment strain on both the Dana Roberts and nearby Hastings substations.
Bonus Shuffle – Port Ludlow Substation
Looking ahead, the rebuilt transformer from Port Ludlow is scheduled to return in October 2025. It will be installed in the substation’s second bay to support continued load growth and a new feeder in the area.