St Stephen
Hydro power plant in Berkeley County, South Carolina. 84 MW of nameplate capacity across 3 generators, operated by US Army Corps of Engineers.
Also known as St Stephen Dam · EIA plant 6789
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 84 MWNameplate
- Generators
- 3 operatingEIA-860M, August 2026
- Operating since
- March 1985First generator online
- Operator
- US Army Corps of EngineersEIA operator ID 50118
- Grid
- SCBalancing authority SC
- Price nodes
- None linkedNo verified ISO node
- Location
- Berkeley County, SC33.4261, −79.9300
- EIA plant ID
- 6789EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power St Stephen produces
Free · EIA-923Net generation, 2025
161 GWh
161,076 MWh, final
Capacity factor, 2025
21.9%
2024: 35.0%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
124.9–489.6
GWh a year. Low 2017, high 2020
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 92,194 | Not reported | 12 of 12 |
| 2001 | 15,852 | Not reported | 12 of 12 |
| 2002 | 48,241 | Not reported | 12 of 12 |
| 2003 | 454,619 | Not reported | 12 of 12 |
| 2004 | 178,559 | Not reported | 12 of 12 |
| 2005 | 266,057 | Not reported | 12 of 12 |
| 2006 | 115,570 | Not reported | 12 of 12 |
| 2007 | 129,066 | Not reported | 12 of 12 |
| 2008 | 25,370 | Not reported | 12 of 12 |
| 2009 | 194,767 | Not reported | 12 of 12 |
| 2010 | 191,018 | 26.0% | 12 of 12 |
| 2011 | 41,811 | 5.7% | 12 of 12 |
| 2012 | 28,485 | 3.9% | 12 of 12 |
| 2013 | 354,312 | 48.2% | 12 of 12 |
| 2014 | 250,349 | 34.0% | 12 of 12 |
| 2015 | 270,817 | 36.8% | 12 of 12 |
| 2016 | 179,304 | 24.3% | 12 of 12 |
| 2017 | 124,928 | 17.0% | 12 of 12 |
| 2018 | 333,414 | 45.3% | 12 of 12 |
| 2019 | 306,898 | 41.7% | 12 of 12 |
| 2020 | 489,597 | 66.4% | 12 of 12 |
| 2021 | 243,863 | 33.1% | 12 of 12 |
| 2022 | 163,477 | 22.2% | 12 of 12 |
| 2023 | 205,824 | 28.0% | 12 of 12 |
| 2024 | 258,562 | 35.0% | 12 of 12 |
| 2025 | 161,076 | 21.9% | 12 of 12 |
| 2026 (provisional, partial year) | Not reported | Not reported | 0 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free accountNo verified ISO price node is linked to this plant, or its price history could not load.
Emissions
Free · EPA CAMPDNo EPA emissions units are linked to this plant.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024. Plants without steam cooling, such as wind, solar and batteries, do not report cooling water.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| 1 | Conventional Hydroelectric | 28.0 | March 1985 |
| 2 | Conventional Hydroelectric | 28.0 | March 1985 |
| 3 | Conventional Hydroelectric | 28.0 | March 1985 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists US Army Corps of Engineers as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
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Questions about St Stephen
How much power does St Stephen produce?
St Stephen reported 161,076 MWh (161 GWh) of net generation in 2025, a 21.9% capacity factor on 84 MW of nameplate capacity.
Where is St Stephen?
St Stephen is in Berkeley County, South Carolina, at 33.4261, −79.9300. It is in the South Carolina Public Service Authority balancing area (SC).
Who operates St Stephen?
EIA-860M for August 2026 lists US Army Corps of Engineers as the operator (EIA operator ID 50118). The operator is not always the owner.
When did St Stephen start operating?
Its first generator began operating in March 1985, according to EIA-860M.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page