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18.8 MW Hydro operating in Clackamas, OR — Portland General Electric Company
18.8 MW
Nameplate Capacity
5
Generators
units
Conventional Hydroelectric
Technology
1911
Operating Since
Coordinates
45.3000, -122.3500
County
Clackamas, OR
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Portland General Electric Co | Portland General Electric | Portland General Electric |
| Owner(s) | Portland General Electric Co | Portland General Electric | — |
| Status | Operating | — | — |
River Mill Hydroelectric Project, also known as River Mill Dam and Station M, is a hydroelectric dam and powerhouse in Clackamas County, Oregon, United States. It is just north of Estacada, Oregon, on the Clackamas River at river mile 23.5. It received its name from being near a sawmill that was located along the river.
Read more on WikipediaRiver Mill is a hydroelectric power plant located in Clackamas County, Oregon. The plant has a total capacity of 18.8 MW across 5 generators, utilizing conventional hydroelectric technology. It began operating in 1911 and is owned and operated by Portland General Electric (PGE). River Mill is ranked as the 27th largest power plant in Oregon out of 63, and 503rd nationally out of 1464 plants. The plant operates within the Portland General Electric Company balancing authority, in the Western Electricity Coordinating Council (WECC) NERC region.
In the latest year of available data, River Mill generated 99,102 MWh of electricity, achieving a capacity factor of 60.1%. Financial data indicates an installed cost of $3,974.48 per kW. The plant's operations and impact have been covered in approximately 10 news articles, with a focus on industry trends, deals, regulatory matters, and grid-related issues.
Generated from EIA, GEM, and public data sources
Grid Region
Pacific Northwest
Market
WEIM Participant
NERC Region
WECC — Western Electricity Coordinating Council
Balancing Authority
11.6K MWh
Latest Month
99.1K MWh
Annual Generation
60.1%
Capacity Factor
Run-of-river hydro · Portland General Electric Company · Data from 2015–2024
$4,145/kW
Installed Cost
$22.0/MWh
Operating Cost
Annual Capital & Operating Expenses
Cumulative Installed Cost
Per-Unit Cost Trends
Market Position
LMP Node
RMP1_7_GNODE1
Pricing Hub
—
Last updated 2026-03-26
View all 5 articlesNo ask pi reports yet for this entity.
ask pi about River MillPortland General Electric Company (PGE)
Grid Voltage
57.0 kV
Regulatory Status
RE — Regulated
Entity Type
Investor-Owned Utility
Sector
Electric Utility