Mankato Energy Center
Blue Earth County, Minnesota · EIA plant ID 56104 · Operator: MEC Holdings, LLC
Nameplate741MWSummer 654 MW
Generators3in service
Net generation2,504GWh12 mo to Dec 2025
Capacity factor44%gas/coal/oil units, summer MW
Heat rate7,134Btu/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 | 286.2 | 13.0% | 7,993 |
| 2007 | 699.5 | 26.6% | 7,698 |
| 2008 | 450.6 | 17.1% | 8,168 |
| 2009 | 325.9 | 12.4% | 8,168 |
| 2010 | 513.3 | 19.5% | 7,650 |
| 2011 | 331.4 | 12.6% | 7,748 |
| 2012 | 488.4 | 18.5% | 7,547 |
| 2013 | 597.8 | 22.8% | 8,075 |
| 2014 | 355.3 | 13.5% | 7,854 |
| 2015 | 460.5 | 17.5% | 7,667 |
| 2016 | 861 | 29.7% | 7,667 |
| 2017 | 696.7 | 24.1% | 7,598 |
| 2018 | 486.3 | 16.8% | 7,506 |
| 2019 | 2,054.2 | 40.7% | 7,087 |
| 2020 | 2,829.9 | 49.3% | 7,741 |
| 2021 | 2,876.4 | 50.2% | 7,407 |
| 2022 | 1,753.8 | 30.6% | 7,599 |
| 2023 | 2,638.8 | 46.1% | 7,421 |
| 2024 | 2,714.6 | 47.3% | 7,037 |
| 2025 | 2,503.7 | 43.7% | 7,134 |
Fuel capability
Gas-fired turbines (CT/GT/CA/CS) that can also burn liquid fuel. EIA-860 Schedule 3 for capability, EIA-923 for actual burn.
StatusLikely still dual fuel
Liquid fuel burned · 36 mo5,108 MMBtu
Last month with liquid burnDec 2025
Switch while operatingYes
Net summer MW on gas167
Net summer MW on oil120
Time gas → oilup to 6 h (EIA 6H)
Time oil → gasup to 6 h (EIA 6H)
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 |
|---|---|---|---|---|---|---|---|---|
| CTG1 | Natural Gas Fired Combined Cycle | CT | 188.7 | 187 | Jun 2019 | Operating | — | coming soon |
| CTG2 | Natural Gas Fired Combined Cycle | CT | 192.1 | 167 | Jul 2006 | Operating | — | coming soon |
| STG1 | Natural Gas Fired Combined Cycle | CA | 360 | 300 | Jul 2006 | Operating | — | coming soon |
Owner / operator
Operator: MEC Holdings, LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| MEC Holdings, LLC | 100.0% | 741 MW |
Nearby plants
Within 80 km.
| Wilmarth | 25 MW | 0.3 km |
| Archer Daniels Midland Mankato | 6 MW | 1.6 km |
| Primrose Solar, LLC | 1 MW | 2 km |
| MN CSG 2019-57 | — | 3.4 km |
| School Sisters CSG | 1 MW | 3.5 km |
| MN CSG 2019-16 LLC | 1 MW | 3.9 km |