Robert Mueller Energy Center
Travis County, Texas · EIA plant ID 56374 · Operator: Austin Energy
Nameplate6MWSummer 5 MW
Generators2in service
Net generation30GWh12 mo to Dec 2025
Capacity factor66%gas/coal/oil units, summer MW
Heat rate12,029Btu/kWhfossil units, electric fuel, HHV
First online2006Runs as baseload
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), gas/coal/oil 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) |
|---|---|---|---|
| 2006 | 1.3 | 5.7% | 9,107 |
| 2007 | 18.1 | 39.6% | 8,922 |
| 2008 | 12.3 | 26.9% | 11,297 |
| 2009 | 17 | 37.3% | 15,479 |
| 2010 | 23.7 | 52.0% | 11,716 |
| 2011 | 25 | 54.8% | 12,260 |
| 2012 | 29.1 | 63.6% | 11,869 |
| 2013 | 27.8 | 61.0% | 13,022 |
| 2014 | 27 | 59.3% | 9,091 |
| 2015 | 27.7 | 60.7% | 9,239 |
| 2016 | 28.3 | 62.0% | 11,539 |
| 2017 | 28.6 | 62.8% | 11,630 |
| 2018 | 28.8 | 63.1% | 11,620 |
| 2019 | 27.6 | 60.5% | 11,557 |
| 2020 | 27.1 | 59.3% | 11,675 |
| 2021 | 23.6 | 51.7% | 11,540 |
| 2022 | 27.7 | 60.8% | 11,742 |
| 2023 | 22.7 | 49.9% | 12,666 |
| 2024 | 32.2 | 70.5% | 11,688 |
| 2025 | 30 | 65.8% | 12,029 |
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 |
|---|---|---|---|---|---|---|---|---|
| CT1 | Natural Gas Fired Combustion Turbine | GT | 4.6 | 3.7 | Jul 2006 | Operating | — | coming soon |
| DG1 | Petroleum Liquids | IC | 1.5 | 1.5 | Jul 2006 | Operating (Standby / backup) | — | coming soon |
Owner / operator
Operator: Austin Energy. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Austin Energy | 100.0% | 6 MW |
Nearby plants
Within 80 km.
| Hal C Weaver Power Plant | 152 MW | 3.4 km |
| Kingsberry Energy Storage System | 2 MW | 4.8 km |
| PowerFin Kingsbery | 3 MW | 4.9 km |
| Austin | 18 MW | 7.5 km |
| Austin Gas Recovery | 5 MW | 8.9 km |
| Decker Creek | 206 MW | 9.1 km |