PGE Completes 475 MW Battery Energy Storage Expansion to Boost Grid Reliability and Stabilize Costs

Portland General Electric has energized 475 MW of battery energy storage capacity across three facilities in the Portland metro area. These systems provide enough electricity to power around 300,000 homes for four hours during peak demand or power interruptions. The expanded battery storage aids in stabilizing energy costs and improving grid reliability, supporting the local power supply during peak demand periods. PGE now boasts a total battery storage capacity of 492 MW, furthering its capability to integrate renewable energy sources and enhance the flexibility and reliability of its service offering.

Portland General Electric (PGE) has expanded its battery energy storage capacity by 475 MW across three facilities in the Portland metro area. These systems, strategically located at key substations in North Portland, Troutdale, and Hillsboro, can power approximately 300,000 homes for four hours during peak demand or power interruptions [1]. The new battery storage capacity brings PGE's total to 492 MW, enhancing its ability to integrate renewable energy sources and improve grid reliability.

The three new facilities include:
- Seaside: A 200 MW PGE-owned facility in North Portland, delivered by Eolian under a fixed-cost Build-Transfer Agreement (BTA) and achieved commercial operation in July 2025 [1].
- Sundial: A 200 MW facility in Troutdale, developed by Eolian and operated by NextEra Energy Resources under a 20-year storage capacity agreement with PGE, and achieved commercial operation in December 2024 [1].
- Constable: A 75 MW PGE-owned facility in Hillsboro, constructed for PGE under an engineering, procurement, and construction agreement with Mortenson, and achieved commercial operation in December 2024 [1].

These battery energy storage systems help PGE stabilize energy costs, limit price volatility for customers, and support the integration of intermittent sources like wind and solar. By providing added flexibility and backup capacity, they ensure reliable electricity access during peak demand periods or grid disruptions [1].

PGE's Senior Director of Energy Supply, Darrington Outama, stated, "Batteries play an important role in helping PGE build a more flexible, reliable, and diverse generation portfolio. They enhance our ability to respond to sudden changes in the grid and help keep energy supply and demand balanced. For customers, that means more stable and reliable power, all at the lowest possible cost" [1].

The completion of these facilities also reduces PGE's reliance on expensive short-term electricity purchases, further stabilizing energy prices and supporting the clean energy transition [1].

References:
[1] https://www.marketscreener.com/news/portland-general-electric-announces-the-completion-of-three-new-utility-scale-battery-energy-storage-ce7c5edfdf89f226
[2] https://finance.yahoo.com/news/pge-energizes-475-mw-battery-110000670.html
[3] https://solarquarter.com/2025/08/07/portland-general-electric-brings-475-mw-of-battery-storage-online-to-boost-grid-reliability-and-support-clean-energy-transition/