
Portland General Electric announced Thursday it has brought a trio of battery projects online totaling 475 MW/1.9 GWh to maintain reliability and limit price volatility in the metropolitan area.
The three projects bring PGE’s large-scale battery storage capacity to 492 MW, representing a significant expansion.
Energy storage plays “an important role in helping PGE build a more flexible, reliable and diverse generation portfolio,” Darrington Outama, PGE’s senior director of energy supply, said in a statement.
Along with providing energy during hours of grid stress, batteries “enhance our ability to respond to sudden changes in the grid and help keep energy supply and demand balanced,” he said.
The four-hour batteries are “strategically located at key substations” in North Portland, Troutdale and Hillsboro, Oregon, PGE said. They will reduce the utility’s need for expensive short-term electricity purchases and support the integration of intermittent sources like wind and solar, the utility said.
The projects include:
- The 200-MW Seaside project, located in North Portland and developed for the utility by Eolian under a fixed-cost build-transfer agreement. The project began commercial operations in July.
- The 200-MW Sundial project in Troutdale, developed by Eolian and operated by NextEra Energy Resources under a 20-year storage capacity agreement with PGE. Sundial came online in December.
- The 75-MW Constable facility in Hillsboro, which was constructed for PGE under an engineering, procurement and construction agreement with Mortenson. The facility achieved commercial operation in December.
Eolian won the Seaside and Sundial projects as part of an all-source request for proposals PGE held in 2021.
“Battery energy storage systems sited at major substations radically improve the use of existing high voltage transmission lines, avoiding expensive or challenging new grid upgrades and providing a low-cost load growth solution through existing infrastructure,” Eolian CEO Aaron Zubot said in a statement.
PGE also has a 17 MW Coffee Creek Battery Storage system near Wilsonville, which began operating in 2024.