MESA 1Retired
Snohomish County, Washington · EIA plant ID 60016 · Operator: PUD 1 of Snohomish County
×2 MW battery retired since 2020 (latest Aug 2025)
Nameplate—MWSummer — MW
Generators0in service
Net generation—GWh12 mo
Capacity factor—not meaningful for storage
Heat rate—thermal plants only
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.
No capacity factor available.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Heat rate applies to fuel-burning (thermal) units only.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2016 | -0.1 | — | — |
| 2017 | -0.1 | — | — |
| 2018 | -0.1 | — | — |
| 2019 | -0.1 | — | — |
| 2020 | 0 | — | — |
| 2021 | 0 | — | — |
| 2022 | -0 | — | — |
| 2023 | 0 | — | — |
| 2024 | -0 | — | — |
| 2025 | -0 | — | — |
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 |
|---|---|---|---|---|---|---|---|---|
| A | Batteries | BA | 1 | 1 | Jul 2015 | Retired Aug 2025 | — | coming soon |
| B | Batteries | BA | 1 | 1 | Feb 2016 | Retired Aug 2025 | — | coming soon |
Owner / operator
Operator: PUD 1 of Snohomish County. 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.
| MESA 2 | retired | 5.4 km |
| Arlington Microgrid | 2 MW | 25.5 km |
| Arlington Battery Energy Storage System | — | 25.6 km |
| University of Washington Power Plant | 15 MW | 31.7 km |
| H M Jackson | 112 MW | 32.4 km |
| AGATE BESS | — | 32.7 km |