Data last collected:
PowerPlantFactsEvidence report · prepared 19 October 2026https://powerplantfacts.com/entity/50382
EIA plant 50382
Walla Walla · Walla Walla · WA
Twin Reservoirs
Operated by Walla Walla City of
Published location
Where is Twin Reservoirs?
This locator uses the coordinates in the approved source record. It shows geographic context, not a site boundary, safety zone or property-risk area.
46.088333, -118.254722
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Capacity is not generation. Nameplate MW describes equipment; annual MWh describes recorded output. Proposed and retired units are not added to operating capacity.
Equipment mix
Operating capacity by technology
Grouped from this plant’s represented generator records. Use the WA plant index for regional peers.
See the evidence
Electricity output across the year
Monthly net generation shows the seasonal shape of this plant's represented output. A negative value is retained when the source reports net consumption.
1604
2569
3454
4358
5633
6868
71,067
8823
9573
10558
11328
12486
MWh net generation · 2024 final edition · EIA 923 represented operating rows. 12 of 12 supplied rows shown; 0 missing values omitted. Months with no reported numeric value are omitted, not treated as zero.
Read the chart as a table
| Record | MWh net generation |
|---|---|
| 1 | 604 |
| 2 | 569 |
| 3 | 454 |
| 4 | 358 |
| 5 | 633 |
| 6 | 868 |
| 7 | 1,067 |
| 8 | 823 |
| 9 | 573 |
| 10 | 558 |
| 11 | 328 |
| 12 | 486 |
2024 monthly net generation
| Month | Net generation |
|---|---|
| 1 | 604 MWh |
| 2 | 569 MWh |
| 3 | 454 MWh |
| 4 | 358 MWh |
| 5 | 633 MWh |
| 6 | 868 MWh |
| 7 | 1,067 MWh |
| 8 | 823 MWh |
| 9 | 573 MWh |
| 10 | 558 MWh |
| 11 | 328 MWh |
| 12 | 486 MWh |
Operating generators
| ID | Technology | Fuel | MW | Status |
|---|---|---|---|---|
| GEN1 | Conventional Hydroelectric | WAT | 2.2 | OP |
Continue exploring
Similar-capacity plants in the same state
Identity, technology and limitations
EIA plant ID
50382
Sector
IPP Non-CHP
Water source
Mill Creek
Data edition
2024-final
Use this record
Questions this evidence can answer
01What exactly is this record?
Use the name, place, date and identifiers above to confirm that you have the right Twin Reservoirs power plant: capacity and generation | PowerPlantFacts record.
02What does the evidence establish?
Read the reported values with their units, coverage dates and source notes. Keep observed facts separate from estimates or interpretation.
03What should I verify next?
Follow the primary-source links and check the limitations before using this evidence for a decision, comparison or citation.
A closer look at Twin Reservoirs
Variation in the published months
Across 12 numeric monthly generation entries, 7 has the highest recorded value (1,067 MWh) and 11 the lowest (328 MWh). Their difference is 739 MWh. Missing months have not been treated as zero.
Generator capacity in different operating conditions
| Generator ID | Technology | Nameplate MW | Summer MW | Winter MW | Minimum load MW |
|---|---|---|---|---|---|
| GEN1 | Conventional Hydroelectric | 2.2 | 1.8 | 1.5 | 0.4 |
EIA-860 2024 final source. Ratings describe capacity, not actual generation or availability. Missing ratings are not zero.
Source: US Energy Information Administration Form EIA-860 2024 plant and operable-generator workbooks; archive 2024. US EIA-authored information is generally public domain; cite EIA, preserve third-party exceptions, changes and no-endorsement context. Source-specific derived data.