Knoxville Battery Energy Storage
Marion County, Iowa · EIA plant ID 62569 · Operator: MidAmerican Energy Co
Nameplate1MWSummer 1 MW
Generators1in service
Net generation-0GWh12 mo to Dec 2025
Capacity factor—not meaningful for storage
Heat rate—thermal plants only
First online2018
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) |
|---|---|---|---|
| 2018 | 0 | — | — |
| 2019 | -0.1 | — | — |
| 2020 | -0.1 | — | — |
| 2021 | -0.1 | — | — |
| 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 |
|---|---|---|---|---|---|---|---|---|
| ES1 | Batteries | BA | 1.1 | 1.1 | Dec 2018 | Operating | — | coming soon |
Owner / operator
Operator: MidAmerican Energy Co. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| MidAmerican Energy Co | 100.0% | 1 MW |
Nearby plants
Within 80 km.
| Knoxville Industrial | 16 MW | 0 km |
| Red Rock Hydro Plant | 55 MW | 9 km |
| Pella Peaking | 28 MW | 14.7 km |
| Prairie Wind Farm | 168 MW | 32.7 km |
| Hy-Vee Customer Hosted 2.25MW Solar | 2 MW | 38.5 km |
| Cargill Corn Milling Division | 40 MW | 39.9 km |