River Mill — Plant Summary
- EIA Plant ID
- 3049
- Capacity
- 18.8 MW
- Primary Fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Status
- Operating
- Location
- Clackamas, OR
- Operating Since
- 1911
- Generators
- 5
- Operator
- Portland General Electric Co
- Parent Company
- Portland General Electric
- Annual Generation
- 99,102 MWh
- Capacity Factor
- 60.1%
- Balancing Authority
- Portland General Electric Company
- ISO/RTO
- —
- NERC Region
- WECC
River Mill
OperatingHydro
Ranked #27 of 63 Hydro plants in OR#495 of 1454 nationally
18.8 MW Hydro operating in Clackamas, OR — Portland General Electric Company
EIAWD
18.8 MW
Nameplate Capacity
5
Generators
units
Conventional Hydroelectric
Technology
1911
Operating Since
Location
Coordinates
45.3000, -122.3500
County
Clackamas, OR
Nearby Plants
- Duus Solar, LLCSolar10 MW · 2.5 km
- Day Hill Solar, LLCSolar2.3 MW · 3.8 km
- OR - Solops - SPI 18 - ClayfieldSolar2.6 MW · 4.2 km
Ownership & Operator
| 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 | — | — |
Ownership Chain
About
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
Engineering & Generators
Grid Context
NERC Region
WECC
Balancing Authority
Portland General Electric Company
Grid Voltage
57 kV
Regulatory Status
RE
Entity Type
Investor-Owned Utility
Sector
Electric Utility
Generation
11.6K MWh
Latest Month
99.1K MWh
Annual Generation
60.1%
Capacity Factor
Jan 2022 – Dec 2024
Financial DataBeta
Source: FERC Form 1HIGH
$4,145/kW
Installed Cost
$22.0/MWh
Operating Cost
Portland General Electric Company
Reporting Utility
Cumulative Installed Cost
Per-Unit Cost Trends
Pricing & Market Data
Market Position
LMP Node
RMP1_7_GNODE1
Pricing Hub
—
News & Articles (10)Beta
Industry·corporate
City officials show residents park plans for unused power plant site
Basketball half-courts, pedestrian connector bridges and a lazy river — these are just some of the amenities that New Haven officials are...
New Haven (other)
Yale Daily News·4 weeks ago
Deals·m and a
Cleanup contract points to buyer, and challenges, of steel mill site
A New Jersey firm emerged last week as the prospective buyer for the Liberty Steel mill in Georgetown, and a possible contender for the...
Liberty Steel (seller)Georgetown (other)
Coastal Observer·2 months ago
Regulatory·state puc
Massachusetts selects 1.2GW of BESS through RFP
Massachusetts's Department of Energy Resources (DOER) has completed the evaluation of bids received in response to the Section 83E Storage...
Massachusetts Department of Energy Resources (regulator)
Energy-Storage.News·2 months ago
Industry·corporate
Jonathan Wharton (opinion): Plans for New Haven’s English Station call for realism over idealism
Over the last few months, much attention has centered on New Haven's unique Ball Island on the Mill River. United Illuminating's English...
New Haven (other)United Illuminating (operator)
CT Insider·2 months ago
Last updated 2026-03-14
View all 10 articles