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200 MW BESS operating in Multnomah, OR
200 MW
Nameplate Capacity
1
Generators
unit
Batteries
Technology
2025
Operating Since
Coordinates
45.6153, -122.7811
County
Multnomah, OR
Nearby Plants
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| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Portland General Electric Co | Portland General Electric | — |
| Owner(s) | Portland General Electric Co | Portland General Electric | — |
| Status | Operating | — | — |
Seaside BESS is a 200 MW battery energy storage system located in Multnomah County, Oregon. The plant, which began operating in 2025, is owned and operated by Portland General Electric (PGE). It is the 8th largest power plant in Oregon and ranks 281st nationally. The facility consists of a single generator utilizing battery technology with a storage duration of 4 hours. The primary fuel type is listed as MWH, indicating it draws power from the grid to charge the batteries.
Seaside BESS operates within the Western Electricity Coordinating Council (WECC) NERC region and is under the balancing authority of Portland General Electric Company. The plant's integration into the grid has been noted in news articles covering grid-related topics.
Generated from EIA, GEM, and public data sources
Grid Region
Pacific Northwest
Market
WEIM Participant
NERC Region
WECC — Western Electricity Coordinating Council
Balancing Authority
Portland General Electric Company (PGE)
Grid Voltage
230.0 kV
Regulatory Status
RE — Regulated
Entity Type
Investor-Owned Utility
Sector
Electric Utility
Monthly net generation as reported to EIA-923 — useful for historical context. Confidence varies sharply by fuel type; the band above and the “About this data” button explain the caveats specific to this plant and how InfraSure’s in-house model handles them.
−3.3K MWh
Net Charging
-10.6K MWh
Annual Net Energy
-1.2%
Capacity Factor
Positive values indicate net discharge (generation exceeds station load). Negative values indicate net charging. Pure battery storage plants are typically net negative due to round-trip efficiency losses.
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2023
$1,361/kW
Est. Construction Cost
Total estimated cost: $272.2M
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This plant's balancing authority participates in CAISO's Western Energy Imbalance Market (WEIM). Direct nodal pricing data is not yet available.
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Browse source data on FERC EQRLast updated 2026-03-26
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