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1159.7 MW Hydro operating in Pend Oreille, WA
1,159.7 MW
Nameplate Capacity
6
Generators
units
Conventional Hydroelectric
Technology
1967
Operating Since
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Owner data does not fully agree across sources.
EIA typically reports the operating utility, while GEM resolves to the financial owner or parent corporation. Both can be correct.
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | City of Seattle - (WA) | Seattle City Light | — |
| Owner(s) | City of Seattle - (WA) | Seattle City Light | — |
| Status | Operating | operating | — |
GEM identifies the owner as Seattle City Light
This entity is not yet in the GEM ownership database — chain unavailable.
Boundary Dam is a concrete arch gravity-type hydroelectric dam, finished in 1967, on the Pend Oreille River, in the U.S. state of Washington. The dam is located in the northeast corner of Washington state. It is operated by Seattle City Light and makes up a significant portion of the City of Seattle's energy portfolio. On average, it provides upwards of 46% of the power generated by Seattle City Light. Boundary Powerhouse, located adjacent to the dam, is completely built inside of the rock that makes up the left abutment of the dam itself. It has a nameplate capacity of just over 1 gigawatt of generation. The component of the hydroelectric project were listed on the National Register of Historic Places in 2018.
Read more on WikipediaThe Boundary hydroelectric plant is located in Pend Oreille County, Washington. It has a total capacity of 1159.7 MW across six generators and began operating in 1967. The primary fuel source is water. The plant is owned and operated by the City of Seattle - (WA). Boundary ranks as the 5th largest power plant in Washington out of 23, and 16th nationally out of 194 plants.
In the most recent year with available data, the plant generated 3,099,497 MWh of electricity, achieving a capacity factor of 30.4%. The balancing authority for the plant is Seattle City Light, and it operates within the Western Electricity Coordinating Council (WECC) NERC region.
Generated from EIA, GEM, and public data sources
Grid Region
Pacific Northwest
Market
WEIM Participant
NERC Region
WECC — Western Electricity Coordinating Council
Balancing Authority
Seattle City Light (SCL)
Grid Voltage
230.0 kV
Regulatory Status
RE — Regulated
Entity Type
Municipal
Sector
Electric Utility
Monthly net generation as reported to EIA-923 — useful for historical context. Confidence varies sharply by fuel type; the band above and the “About this data” button explain the caveats specific to this plant and how InfraSure’s in-house model handles them.
393.8K MWh
Latest Month
3.1M MWh
Annual Generation
30.4%
Capacity Factor
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2013
$2,294/kW
Est. Construction Cost
Total estimated cost: $2.7B
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Market Position
LMP Node
BNDRYSCL_2_GEN51GNODE
Pricing Hub
—
No wholesale contracts disclosed in FERC EQR for this plant.
FERC EQR captures bilateral wholesale energy + capacity contracts ≥$1M/yr filed quarterly by jurisdictional sellers — covers renewable PPAs, thermal energy sales agreements, capacity contracts, and tolling agreements alike. Many plants don't appear: regulated-utility output flows to ratepayers via cost-of-service rather than bilateral contracts; small projects fall below the filing threshold; tax-equity-financed renewables route offtake to investors not utilities; merchant plants sell into ISO clearing markets without bilateral contracts. News-extracted buyer facts (below) may surface contracts disclosed only through announcements.
Last updated 2026-03-26
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