- Clean firm
- Operating
- 10 · 100 · 1,000 MW
Map
- Clean firm
- Operating
Merwin: location. Basemap: Protomaps, © OpenStreetMap contributors, ODbL.
Merwin
Power plant · Hydro
Key facts
Power plant · Hydroran 35% of 2025 Operating- Capacity
- Capacity: sourceEIA-860M · Open licenseMW
- Commissioned
- 1931
- Net generation, 2025
- 422,567 MWh
- Grid
- 115 kV to PacifiCorp (PACW)
- Location
- Cowlitz County, Washington
- Operated by
- PacifiCorpSourceEIA-860M Preliminary Monthly Electric Generator Inventory
Operations
- Net generation, 2025
- 422,567
MWh - Fuel burned, 2025
- 1,441,798
MMBtu - Capacity factor, 2025
- 35.5
% - Heat rate, 2025
- Not stated
| Year | Net generation (MWh) | Fuel burned (MMBtu) | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|---|
| 2025 | 422,567 | 1,441,798 | 35.5% | — |
| 2024 | 467,317 | 1,594,485 | 39.1% | — |
| 2023 | 471,579 | 1,609,028 | 39.6% | — |
| 2022 | 487,064 | 1,661,863 | 40.9% | — |
| 2021 | 465,720 | 4,118,828 | 39.1% | — |
| 2020 | 471,718 | 4,135,550 | 39.5% | — |
| 2019 | 337,034 | 3,001,290 | 28.3% | — |
| 2018 | 450,459 | 4,100,979 | 37.8% | — |
| 2017 | 629,623 | 5,800,717 | 52.8% | — |
| 2016 | 560,116 | 5,170,991 | 46.9% | — |
| 2015 | 398,837 | 3,716,762 | 33.5% | — |
| 2014 | 579,582 | 5,511,825 | 48.6% | — |
| 2013 | 460,852 | 4,396,988 | 38.7% | — |
| 2012 | 657,559 | 6,257,331 | 55.0% | — |
| 2011 | 576,030 | 5,596,708 | 48.4% | — |
| 2010 | 559,382 | 5,457,333 | 46.9% | — |
| 2009 | 452,443 | 4,415,844 | 38.0% | — |
| 2008 | 481,775 | 4,747,410 | 40.3% | — |
| 2007 | 473,458 | 4,679,659 | 39.7% | — |
| 2006 | 547,025 | 5,425,942 | 45.9% | — |
| 2005 | 406,308 | 4,062,674 | 34.1% | — |
| 2004 | 457,331 | 4,583,371 | 38.3% | — |
| 2003 | 501,921 | 5,140,173 | 42.1% | — |
| 2002 | 486,481 | 4,948,971 | 40.8% | — |
| 2001 | 353,415 | 3,651,837 | 29.7% | — |
How these are worked out
Net generation and fuel burned are the monthly figures EIA publishes in its bulk electricity file, from the plant's Form 923 reports; a year is the sum of its months. Capacity factor is a full year's net generation over today's nameplate capacity times the hours in that year (8,784 in a leap year), so a plant uprated or partly retired since reads against its current size; heat rate is fuel burned over net generation, for plants that burn fuel. A year with fewer than twelve months stated has no capacity factor, and a value outside the plausible range is left blank rather than shown. By month, the charts apply the same rules to each month's own hours and fuel.
Sources
3 sourcesSources
- EIA-860M
- GEMGlobal Integrated Power Tracker, Global Energy Monitor, September 2026 release (https://globalenergymonitor.org/projects/global-integrated-power-tracker), CC BY 4.0. Modified by Inframation: TransitionZero-sourced rows removed; statuses and technologies mapped to Inframation's vocabulary; figures aggregated. Copyright © Global Energy Monitor. Global Integrated Power Tracker, September 2026 release. Distributed under a Creative Commons Attribution 4.0 International License.
- EIASource: U.S. Energy Information Administration, Electricity bulk data (Form EIA-923 monthly plant series)