Drop 4
Imperial County, California · EIA plant ID 387 · Operator: Imperial Irrigation District
Nameplate20MWSummer 20 MW
Generators2in service
Net generation75GWh12 mo to Dec 2025
Capacity factor43%hydro units, summer MW
Heat rate—thermal plants only
First online1941
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 | 111 | 79.2% | — |
| 2002 | 118.5 | 84.5% | — |
| 2003 | 105.1 | 75.0% | — |
| 2004 | 101.6 | 72.3% | — |
| 2005 | 95.6 | 68.2% | — |
| 2006 | 106.7 | 76.1% | — |
| 2007 | 104.9 | 74.8% | — |
| 2008 | 106 | 75.4% | — |
| 2009 | 98.8 | 70.5% | — |
| 2010 | 98.1 | 70.0% | — |
| 2011 | 110.8 | 79.0% | — |
| 2012 | 110.5 | 78.6% | — |
| 2013 | 99.6 | 56.8% | — |
| 2014 | 96.2 | 57.5% | — |
| 2015 | 88.6 | 53.0% | — |
| 2016 | 93.2 | 55.6% | — |
| 2017 | 16.8 | 10.1% | — |
| 2018 | 3.3 | 2.0% | — |
| 2019 | 84.9 | 50.8% | — |
| 2020 | 79.3 | 47.3% | — |
| 2021 | 97.8 | 55.8% | — |
| 2022 | 93 | 53.1% | — |
| 2023 | 79.8 | 45.6% | — |
| 2024 | 78.2 | 44.5% | — |
| 2025 | 74.9 | 42.7% | — |
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 | 10 | 10 | Aug 1950 | Operating | — | coming soon |
| 2 | Conventional Hydroelectric | HY | 9.6 | 10 | Feb 1941 | Operating | — | coming soon |
Owner / operator
Operator: Imperial Irrigation District. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Imperial Irrigation District | 100.0% | 20 MW |
Nearby plants
Within 80 km.
| East Highline | 2 MW | 6 km |
| Imperial Sun Solar | — | 7.7 km |
| Drop 3 (CA) | 9 MW | 8.7 km |
| Geo East Mesa II | 22 MW | 8.9 km |
| Geo East Mesa III | 46 MW | 8.9 km |
| Ormesa II | 24 MW | 9.6 km |