15.4 MW Hydro operating in Clackamas, OR — Portland General Electric Company
15.4 MW
Nameplate Capacity
13
Generators
units
Conventional Hydroelectric
Technology
1924
Operating Since
Coordinates
45.3540, -122.6190
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 | — | — |
Portland General Electric's (PGE) T. W. Sullivan Hydroelectric Plant is a hydroelectric dam on the Willamette Falls built between 1888 and 1895. It is the source of the nation's first long-distance power transmission. The plant first opened with Station A in 1889. In 1895 a second powerhouse was built on the same dam, Station B, and Station A was removed. Station B. In 1953 Station B was renamed after the engineer, Thomas Sullivan, who designed it and the nearby paper mills. The Willamette Falls Paper Company was on the northwest bank, whereas the Blue Heron paper mill was across the river in Oregon City. By that year, the plant was generating between 11,000 and 17,500 kilowatts, which it still does today. PGE's Sullivan Plant at Willamette Falls is one of only a few dozen hydro-plants in the country officially designated as "Green." In the 1920s a portion of the paper mill was put on top of the dam, which was demolished in 2024.
Read more on WikipediaThe Sullivan hydroelectric plant is located in Clackamas County, Oregon. The plant has a total capacity of 15.4 MW across 13 generators, and it began operating in 1924. It is owned and operated by Portland General Electric (PGE). The plant utilizes conventional hydroelectric technology and its primary fuel source is water (WAT).
In the most recent year with available data, Sullivan generated 104,142 MWh, achieving a capacity factor of 77.0%. The plant operates within the Portland General Electric Company balancing authority and the Western Electricity Coordinating Council (WECC) NERC region. According to available data, the installed cost per kW was $4,298.29. Sullivan ranks as the 31st largest power plant in Oregon out of 63, and 545th nationally out of 1464 plants.
Generated from EIA, GEM, and public data sources
NERC Region
WECC
Balancing Authority
Portland General Electric Company
Grid Voltage
57 kV
Regulatory Status
RE
Entity Type
Investor-Owned Utility
Sector
Electric Utility
6.6K MWh
Latest Month
104.1K MWh
Annual Generation
77.0%
Capacity Factor
$4,298/kW
Installed Cost
$10.4/MWh
Operating Cost
Portland General Electric Company
Reporting Utility
Cumulative Installed Cost
Per-Unit Cost Trends
This plant is outside organized wholesale electricity markets (ISOs/RTOs). Nodal pricing data is not available.
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Last updated 2026-03-15
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