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51 MW Hydro out of service in Clackamas, OR — Portland General Electric Company
51 MW
Nameplate Capacity
2
Generators
units
Conventional Hydroelectric
Technology
1924
Operating Since
Coordinates
45.1220, -122.0699
County
Clackamas, 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 | Out of service | operating | — |
The Oak Grove Hydroelectric Project is a 44 megawatt hydroelectric plant operated by Portland General Electric (PGE) on the Oak Grove Fork Clackamas River. Water for this project is held by three lakes, built between 1923 and 1956. The dam creates the impoundment Lake Harriet.
Read more on WikipediaOak Grove is a hydroelectric power plant located in Clackamas County, Oregon. The plant, owned and operated by Portland General Electric (PGE), has a total capacity of 51 MW distributed across two generators. It commenced operations in 1924, utilizing water as its primary fuel source and employing conventional hydroelectric technology. Oak Grove ranks as the 13th largest power plant in Oregon out of 63, and 300th nationally out of 1464 facilities. The plant operates within the Portland General Electric Company balancing authority, under the oversight of the Western Electricity Coordinating Council (WECC).
In the most recent year with available data, Oak Grove generated 150,144 MWh of electricity, achieving a capacity factor of 33.6%. Financial data indicates an installed cost of $1,455.11 per kW. Information about the plant has appeared in news articles 10 times, with coverage focusing on regulatory matters (7 articles), industry news (2 articles), and hazards (1 article). A Wikipedia extract is available for the plant.
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
115.0 kV
Regulatory Status
RE — Regulated
Entity Type
Investor-Owned Utility
Sector
Electric Utility
15.9K MWh
Latest Month
150.1K MWh
Annual Generation
33.6%
Capacity Factor
Run-of-river hydro · Portland General Electric Company · Data from 2015–2024
$1,714/kW
Installed Cost
$35.4/MWh
Operating Cost
Annual Capital & Operating Expenses
Cumulative Installed Cost
Per-Unit Cost Trends
Market Position
LMP Node
OGP1_1_GNODE1
Pricing Hub
—
Last updated 2026-03-26
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