Twin Branch
St. Joseph County, Indiana · EIA plant ID 989 · Operator: Indiana Michigan Power Co
Nameplate5MWSummer 4 MW
Generators8in service
Net generation21GWh12 mo to Dec 2025
Capacity factor61%hydro units, summer MW
Heat rate—thermal plants only
First online1989
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), hydro 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.
Heat rate applies to fuel-burning (thermal) units only.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2001 | 33 | 144.8% | — |
| 2002 | 26.7 | 112.8% | — |
| 2003 | 23.4 | 99.0% | — |
| 2004 | 28.1 | 118.3% | — |
| 2005 | 23.4 | 92.1% | — |
| 2006 | 19.5 | 76.7% | — |
| 2007 | 26.2 | 103.0% | — |
| 2008 | 26.5 | 104.1% | — |
| 2009 | 25.5 | 100.4% | — |
| 2010 | 26.4 | 103.9% | — |
| 2011 | 27.6 | 108.6% | — |
| 2012 | 21.8 | 85.5% | — |
| 2013 | 28.7 | 81.8% | — |
| 2014 | 29.9 | 85.2% | — |
| 2015 | 27.6 | 78.8% | — |
| 2016 | 29.2 | 83.0% | — |
| 2017 | 25.5 | 72.8% | — |
| 2018 | 31.4 | 89.5% | — |
| 2019 | 27 | 77.1% | — |
| 2020 | 24.4 | 69.3% | — |
| 2021 | 24.9 | 71.0% | — |
| 2022 | 24.2 | 69.0% | — |
| 2023 | 18.2 | 52.0% | — |
| 2024 | 22.9 | 65.2% | — |
| 2025 | 21.4 | 61.1% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| H1E | Conventional Hydroelectric | HY | 0.6 | 0.5 | May 1989 | Operating | — | coming soon |
| H1W | Conventional Hydroelectric | HY | 0.6 | 0.5 | May 1989 | Operating | — | coming soon |
| H2W | Conventional Hydroelectric | HY | 0.6 | 0.5 | May 1989 | Operating | — | coming soon |
| H3W | Conventional Hydroelectric | HY | 0.6 | 0.5 | May 1989 | Operating | — | coming soon |
| H4W | Conventional Hydroelectric | HY | 0.6 | 0.5 | May 1989 | Operating | — | coming soon |
| H5W | Conventional Hydroelectric | HY | 0.6 | 0.5 | May 1989 | Operating | — | coming soon |
| H6E | Conventional Hydroelectric | HY | 0.6 | 0.5 | May 1989 | Operating | — | coming soon |
| H6W | Conventional Hydroelectric | HY | 0.6 | 0.5 | May 1989 | Operating | — | coming soon |
Owner / operator
Operator: Indiana Michigan Power Co. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Indiana Michigan Power Co | 100.0% | 5 MW |
Nearby plants
Within 80 km.
| Twin Branch PV | 3 MW | 3 km |
| St. Joseph Solar | 20 MW | 7.6 km |
| Notre Dame Hydro | 3 MW | 9.5 km |
| University of Notre Dame | 40 MW | 10 km |
| Earthmovers LFGTE | 5 MW | 13.9 km |
| Elkhart | 3 MW | 14.2 km |