Diablo
Hydro power plant in Whatcom County, Washington. 182.4 MW of nameplate capacity across 4 generators, operated by City of Seattle - (WA).
Also known as Diablo Dam · EIA plant 6432
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 182.4 MWNameplate
- Generators
- 4 operatingEIA-860M, August 2026
- Operating since
- October 1936First generator online
- Operator
- City of Seattle - (WA)EIA operator ID 16868
- Grid
- SCLBalancing authority SCL
- Price nodes
- 2 CAISO nodesResource nodes with prices
- Location
- Whatcom County, WA48.7139, −121.1317
- EIA plant ID
- 6432EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Diablo produces
Free · EIA-923Net generation, 2025
518 GWh
518,187 MWh, final
Capacity factor, 2025
32.4%
2024: 22.6%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
361.4–869.1
GWh a year. Low 2024, high 2016
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 813,281 | Not reported | 12 of 12 |
| 2001 | 476,472 | Not reported | 12 of 12 |
| 2002 | 898,864 | Not reported | 12 of 12 |
| 2003 | 742,870 | Not reported | 12 of 12 |
| 2004 | 776,449 | Not reported | 12 of 12 |
| 2005 | 653,648 | Not reported | 12 of 12 |
| 2006 | 744,219 | Not reported | 12 of 12 |
| 2007 | 833,695 | Not reported | 12 of 12 |
| 2008 | 754,683 | Not reported | 12 of 12 |
| 2009 | 689,399 | Not reported | 12 of 12 |
| 2010 | 718,580 | Not reported | 12 of 12 |
| 2011 | 918,897 | 57.5% | 12 of 12 |
| 2012 | 935,630 | 58.4% | 12 of 12 |
| 2013 | 826,276 | 51.7% | 12 of 12 |
| 2014 | 856,105 | 53.6% | 12 of 12 |
| 2015 | 773,699 | 48.4% | 12 of 12 |
| 2016 | 869,137 | 54.2% | 12 of 12 |
| 2017 | 691,559 | 43.3% | 12 of 12 |
| 2018 | 624,780 | Not reported | 12 of 12 |
| 2019 | 609,755 | Not reported | 12 of 12 |
| 2020 | 702,510 | 43.8% | 12 of 12 |
| 2021 | 845,622 | 52.9% | 12 of 12 |
| 2022 | 588,918 | 36.9% | 12 of 12 |
| 2023 | 548,860 | 34.4% | 12 of 12 |
| 2024 | 361,396 | 22.6% | 12 of 12 |
| 2025 | 518,187 | 32.4% | 12 of 12 |
| 2026 (provisional, partial year) | Not reported | Not reported | 0 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free account · CAISOEmissions
Free · EPA CAMPDNo EPA emissions units are linked to this plant.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024. Plants without steam cooling, such as wind, solar and batteries, do not report cooling water.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| 31 | Conventional Hydroelectric | 90.0 | April 1937 |
| 32 | Conventional Hydroelectric | 90.0 | October 1936 |
| 35 | Conventional Hydroelectric | 1.2 | October 1936 |
| 36 | Conventional Hydroelectric | 1.2 | October 1936 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists City of Seattle - (WA) as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
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Power plants near Diablo
More plants operated by City of Seattle - (WA)
Questions about Diablo
How much power does Diablo produce?
Diablo reported 518,187 MWh (518 GWh) of net generation in 2025, a 32.4% capacity factor on 182.4 MW of nameplate capacity.
Where is Diablo?
Diablo is in Whatcom County, Washington, at 48.7139, −121.1317. It is in the Seattle City Light balancing area (SCL).
Who operates Diablo?
EIA-860M for August 2026 lists City of Seattle - (WA) as the operator (EIA operator ID 16868). The operator is not always the owner.
When did Diablo start operating?
Its first generator began operating in October 1936, according to EIA-860M.
Does InfraMap have power prices for Diablo?
Yes. InfraMap has CAISO day-ahead and real-time prices at 2 price nodes linked to Diablo, with the hub price and node-to-hub basis. Prices are free with an InfraMap account; pricing node names are part of InfraMap Pro.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
- CAISO day-ahead and real-time prices; node and hub assignments as of 2026-10-05
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page