St Stephen
Berkeley County, South Carolina · EIA plant ID 6789 · Operator: US Army Corps of Engineers
Nameplate84MWSummer 84 MW
Generators3in service
Net generation161GWh12 mo to Dec 2025
Capacity factor22%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 | 15.9 | 2.1% | — |
| 2002 | 48.2 | 6.6% | — |
| 2003 | 454.6 | 61.8% | — |
| 2004 | 178.6 | 24.2% | — |
| 2005 | 266.1 | 36.2% | — |
| 2006 | 115.6 | 15.7% | — |
| 2007 | 129.1 | 17.5% | — |
| 2008 | 25.4 | 3.4% | — |
| 2009 | 194.8 | 26.5% | — |
| 2010 | 191 | 26.0% | — |
| 2011 | 41.8 | 5.7% | — |
| 2012 | 28.5 | 3.9% | — |
| 2013 | 354.3 | 48.1% | — |
| 2014 | 250.3 | 34.0% | — |
| 2015 | 270.8 | 36.8% | — |
| 2016 | 179.3 | 24.3% | — |
| 2017 | 124.9 | 17.0% | — |
| 2018 | 333.4 | 45.3% | — |
| 2019 | 306.9 | 41.7% | — |
| 2020 | 489.6 | 66.3% | — |
| 2021 | 243.9 | 33.1% | — |
| 2022 | 163.5 | 22.2% | — |
| 2023 | 205.8 | 28.0% | — |
| 2024 | 258.6 | 35.0% | — |
| 2025 | 161.1 | 21.9% | — |
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 | 28 | 28 | Mar 1985 | Operating | — | coming soon |
| 2 | Conventional Hydroelectric | HY | 28 | 28 | Mar 1985 | Operating | — | coming soon |
| 3 | Conventional Hydroelectric | HY | 28 | 28 | Mar 1985 | Operating | — | coming soon |
Owner / operator
Operator: US Army Corps of Engineers. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| US Army Corps of Engineers | 100.0% | 84 MW |
Nearby plants
Within 80 km.
| Cross | 2,452 MW | 18.1 km |
| Pinopolis BESS | — | 20.6 km |
| Jefferies | 145 MW | 21 km |
| Spillway | 2 MW | 21.9 km |
| Kingstree West 115 | — | 29.9 km |
| Berkeley County Landfill | 3 MW | 35.2 km |