Marco Ranch
Jerome County, Idaho · EIA plant ID 50323 · Operator: Marco Power Inc
Nameplate1MWSummer 1 MW
Generators4in service
Net generation2GWh12 mo to Dec 2025
Capacity factor24%hydro units, summer MW
Heat rate—thermal plants only
First online1985
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 | 0.9 | 9.0% | — |
| 2002 | 2.1 | 20.1% | — |
| 2003 | 2 | 19.4% | — |
| 2004 | 1.6 | 15.0% | — |
| 2005 | 2 | 19.2% | — |
| 2006 | 2.3 | 22.3% | — |
| 2007 | 2 | 18.9% | — |
| 2008 | 2.6 | 24.5% | — |
| 2009 | 2.9 | 27.9% | — |
| 2010 | 3.1 | 29.7% | — |
| 2011 | 3.5 | 33.3% | — |
| 2012 | 2.9 | 27.2% | — |
| 2014 | 2 | 18.7% | — |
| 2015 | 3 | 28.7% | — |
| 2016 | 2.9 | 27.8% | — |
| 2017 | 3.4 | 32.7% | — |
| 2018 | 3 | 28.6% | — |
| 2019 | 2.9 | 27.9% | — |
| 2020 | 3.1 | 29.7% | — |
| 2021 | 2.6 | 24.4% | — |
| 2022 | 2.2 | 21.0% | — |
| 2023 | 2.3 | 21.7% | — |
| 2024 | 2.5 | 23.6% | — |
| 2025 | 2.5 | 23.5% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| 1 | Conventional Hydroelectric | HY | 0.3 | 0.3 | Aug 1985 | Operating | — | coming soon |
| 2 | Conventional Hydroelectric | HY | 0.3 | 0.3 | Aug 1985 | Operating | — | coming soon |
| 3 | Conventional Hydroelectric | HY | 0.3 | 0.3 | Aug 1985 | Operating | — | coming soon |
| 4 | Conventional Hydroelectric | HY | 0.3 | 0.3 | Aug 1985 | Operating | — | coming soon |
Owner / operator
Operator: Marco Power Inc. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Marco Power Inc | 100.0% | 1 MW |
Nearby plants
Within 80 km.
| Rock Creek I | 2 MW | 1.6 km |
| Rock Creek II | 2 MW | 2.8 km |
| Crystal Springs | 2 MW | 4.9 km |
| Filer BESS | 2 MW | 7.8 km |
| Little Mac Project | 2 MW | 8.5 km |
| Cargill B6 Biofactory | 2 MW | 10.1 km |