Seaside BESS
Battery storage power plant · Multnomah County, Oregon
Nameplate capacity
200 MW
Rank in Oregon
#24
of 301 plants
In service since
2025
July 2025
Details
- Primary fuel
- Battery storage
- Technology
- Batteries
- Operator
- Portland General Electric Co
- County
- Multnomah County
- Generating units
- 1
- Share of state capacity
- 1.04%
- Rank among battery storage plants in Oregon
- #1 of 4
- EIA plant code
- 67711
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| SESD1 | Batteries | 200 MW | 200 MW | 2025 | Operating |
Nameplate is the maximum rated output; summer capacity is what the unit can reliably deliver on a hot day, which is typically lower.
Similarly sized plants in Oregon
| Golden Hill Wind | Wind | 201 MW |
| Montague Wind Power Facility LLC | Wind | 200 MW |
| Sundial (Troutdale) BESS | Battery storage | 200 MW |
| Wheatridge East Wind | Wind | 200 MW |
About this data
From EIA’s inventory of operable generators, May 2026 release. Capacity is nameplate — the maximum rated output of the equipment, not what the plant actually generates over a year, which depends on how often it runs. A 200 MW solar plant and a 200 MW nuclear plant have the same entry here and produce very different amounts of electricity.
“In service since” is the earliest in-service date among the units still listed, so a site rebuilt around newer equipment can read as younger than the site itself. All Oregon power plants · What Oregon actually generates