Marsh Valley Development
Bannock County, Idaho · EIA plant ID 50972 · Operator: Marsh Valley Development Inc
Nameplate2MWSummer 2 MW
Generators1in service
Net generation4GWh12 mo to Dec 2025
Capacity factor27%hydro units, summer MW
Heat rate—thermal plants only
First online1993
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 | 3.3 | 25.1% | — |
| 2002 | 3.3 | 25.1% | — |
| 2003 | 2.5 | 19.1% | — |
| 2004 | 2.1 | 15.5% | — |
| 2005 | 4.5 | 33.7% | — |
| 2006 | 6.7 | 50.3% | — |
| 2007 | 4.9 | 37.5% | — |
| 2008 | 4 | 30.4% | — |
| 2009 | 4.7 | 36.0% | — |
| 2010 | 3.2 | 24.0% | — |
| 2011 | 5.9 | 45.1% | — |
| 2012 | 5.1 | 38.6% | — |
| 2013 | 3.4 | 25.5% | — |
| 2014 | 3.7 | 27.9% | — |
| 2015 | 3.1 | 23.9% | — |
| 2016 | 4.7 | 35.9% | — |
| 2017 | 7.6 | 57.8% | — |
| 2018 | 6.9 | 52.3% | — |
| 2019 | 7.7 | 58.4% | — |
| 2020 | 6.3 | 47.6% | — |
| 2021 | 4 | 30.3% | — |
| 2022 | 3.7 | 28.4% | — |
| 2023 | 6.9 | 52.8% | — |
| 2024 | 2.2 | 16.6% | — |
| 2025 | 3.5 | 26.7% | — |
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 | 1.6 | 1.5 | Apr 1993 | Operating | — | coming soon |
Owner / operator
Operator: Marsh Valley Development Inc. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Marsh Valley Development Inc | 100.0% | 2 MW |
Nearby plants
Within 80 km.
| Bannock County LFG to Energy | 3 MW | 25.2 km |
| Grace | 33 MW | 30.7 km |
| Last Chance | 2 MW | 36.4 km |
| Soda | 15 MW | 37.1 km |
| Simplot Leasing Don Plant | 16 MW | 44.1 km |
| Power County Wind Park South | 23 MW | 50.5 km |