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75 MW BESS operating in Washington, OR — Portland General Electric Company
75 MW
Nameplate Capacity
1
Generators
unit
Batteries
Technology
2024
Operating Since
Coordinates
45.5590, -122.9437
County
Washington, OR
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Portland General Electric Co | Portland General Electric | — |
| Owner(s) | Portland General Electric Co | Portland General Electric | — |
| Status | Operating | — | — |
Constable BESS is a 75 MW battery energy storage system located in Washington County, Oregon. The plant began operating in 2024 and is owned and operated by Portland General Electric (PGE). It is interconnected to the grid within the Portland General Electric Company balancing authority, operating within the Western Electricity Coordinating Council (WECC) NERC region. The facility utilizes batteries as its primary fuel source (MWH) and consists of a single generator.
The battery system has a total storage capacity of 300 MWh, providing a duration of 4 hours. The battery chemistry is lithium-ion (LIB). Constable BESS ranks as the 10th largest of 12 battery storage plants in Oregon, and 555th out of 1205 nationally.
Generated from EIA, GEM, and public data sources
Grid Region
Pacific Northwest
Market
WEIM Participant
NERC Region
WECC — Western Electricity Coordinating Council
Balancing Authority
−1.1K MWh
Net Charging
-10.8K MWh
Annual Net Energy
-1.6%
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.
2023
$1,361/kW
Est. Construction Cost
Total estimated cost: $102.1M
This plant's balancing authority participates in CAISO's Western Energy Imbalance Market (WEIM). Direct nodal pricing data is not yet available.
Last updated 2026-03-26
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ask pi about Constable BESSPortland General Electric Company (PGE)
Grid Voltage
115.0 kV
Regulatory Status
RE — Regulated
Entity Type
Investor-Owned Utility
Sector
Electric Utility