Threemile DigesterRetired
Morrow County, Oregon · EIA plant ID 58382 · Operator: TMF-RIG, LLC
×5 MW natural gas retired since 2020 (latest Mar 2026)
Nameplate—MWSummer — MW
Generators0in service
Net generation35GWh12 mo to Dec 2025
Capacity factor84%no 923 generation in the last 12 months
Heat rate5,026Btu/kWhfossil units, electric fuel, HHV
First online—
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), primary-fuel units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2013 | 21.7 | — | — |
| 2014 | 34.8 | — | — |
| 2015 | 34.3 | — | — |
| 2016 | 15.5 | — | — |
| 2017 | 28.7 | — | — |
| 2018 | 31.6 | — | — |
| 2019 | 32.8 | — | 5,025 |
| 2020 | 37.5 | — | 5,020 |
| 2021 | 36.3 | 86.4% | 5,018 |
| 2022 | 34.4 | 81.9% | 5,011 |
| 2023 | 37.6 | 89.4% | 5,062 |
| 2024 | 36.4 | 86.4% | 5,188 |
| 2025 | 35.4 | 84.2% | 5,026 |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| GEN1 | Natural Gas Internal Combustion Engine | IC | 1.6 | 1.6 | Dec 2012 | Retired Mar 2026 | — | coming soon |
| GEN2 | Natural Gas Internal Combustion Engine | IC | 1.6 | 1.6 | Dec 2012 | Retired Mar 2026 | — | coming soon |
| GEN3 | Natural Gas Internal Combustion Engine | IC | 1.6 | 1.6 | Dec 2012 | Retired Jan 2026 | — | coming soon |
Owner / operator
Operator: TMF-RIG, LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
Nearby plants
Within 80 km.
| Threemile Canyon | 10 MW | 4.7 km |
| Carty Generating Station | 500 MW | 7 km |
| Boardman | retired | 7.4 km |
| Willow Creek Energy Center | 72 MW | 9.4 km |
| South Hurlburt Wind LLC | 290 MW | 13.9 km |
| North Hurlburt Wind LLC | 265 MW | 14.4 km |