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136 MW Hydro operating in Cowlitz, WA
136 MW
Nameplate Capacity
4
Generators
units
Conventional Hydroelectric
Technology
1931
Operating Since
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| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | PacifiCorp | Pacific | — |
| Owner(s) | PacifiCorp | Berkshire Hathaway | — |
| Status | Operating | operating | — |
Merwin Dam is a concrete arch gravity-type hydroelectric dam on the Lewis River, in the U.S. state of Washington. It is located on the border between Cowlitz County and Clark County. Its reservoir is called Lake Merwin.
Read more on WikipediaMerwin is a 136 MW hydroelectric power plant located in Cowlitz County, Washington. The plant began operating in 1931 and consists of 4 generators utilizing conventional hydroelectric technology. The primary fuel source is water (WAT). PacifiCorp, a subsidiary of Berkshire Hathaway, operates the facility. Merwin ranks 19th out of 23 power plants in Washington and 140th out of 194 nationally. The plant operates within the PacifiCorp - West balancing authority and the Western Electricity Coordinating Council (WECC) NERC region.
In the latest year of reported generation, Merwin produced 467,317 MWh of electricity, achieving a capacity factor of 39.2%. Financial data indicates an installed cost of $1305.66 per kW. The power purchase agreement (PPA) price is $10.78 per MWh. Financial data is sourced from FERC and FERC Electric Quarterly Reports (EQR).
Generated from EIA, GEM, and public data sources
Grid Region
Pacific Northwest
Market
WEIM Participant
NERC Region
WECC — Western Electricity Coordinating Council
Balancing Authority
PacifiCorp - West (PACW)
Grid Voltage
115.0 kV
Regulatory Status
RE — Regulated
Entity Type
Investor-Owned Utility
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.
60.7K MWh
Latest Month
467.3K MWh
Annual Generation
39.2%
Capacity Factor
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PacifiCorp · Data from 2015–2025
$10.8/MWh
PPA Price
Annual Capital & Operating Expenses
Cumulative Installed Cost
Per-Unit Cost Trends
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This plant's balancing authority participates in CAISO's Western Energy Imbalance Market (WEIM). Direct nodal pricing data is not yet available.
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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