Spillway
Berkeley County, South Carolina · EIA plant ID 3321 · Operator: South Carolina Public Service Authority
Nameplate2MWSummer 2 MW
Generators1in service
Net generation5GWh12 mo to Dec 2025
Capacity factor28%hydro units, summer MW
Heat rate—thermal plants only
First online1950
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 | 15.1 | 85.9% | — |
| 2002 | 15.2 | 86.5% | — |
| 2003 | 14.4 | 82.4% | — |
| 2004 | 15.4 | 87.8% | — |
| 2005 | 16.1 | 91.7% | — |
| 2006 | 17 | 97.1% | — |
| 2007 | 14.4 | 82.1% | — |
| 2008 | 12.4 | 70.9% | — |
| 2009 | 13.7 | 78.0% | — |
| 2010 | 14.8 | 84.5% | — |
| 2011 | 15.9 | 90.9% | — |
| 2012 | 15.4 | 87.9% | — |
| 2013 | 15.5 | 88.6% | — |
| 2014 | 15.8 | 90.3% | — |
| 2015 | 15.1 | 86.4% | — |
| 2016 | 15.7 | 89.4% | — |
| 2017 | 16.6 | 94.9% | — |
| 2018 | 14.7 | 84.2% | — |
| 2019 | 6.4 | 36.6% | — |
| 2020 | 7.3 | 41.5% | — |
| 2021 | 13.2 | 75.5% | — |
| 2022 | 15.4 | 87.8% | — |
| 2023 | 11.8 | 67.3% | — |
| 2024 | 3.7 | 20.9% | — |
| 2025 | 4.8 | 27.5% | — |
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 | 2 | 2 | Aug 1950 | Operating | — | coming soon |
Owner / operator
Operator: South Carolina Public Service Authority. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| South Carolina Public Service Authority | 100.0% | 2 MW |
Nearby plants
Within 80 km.
| Cross | 2,452 MW | 10.3 km |
| St Stephen | 84 MW | 21.9 km |
| Bloom Solar | 2 MW | 23.7 km |
| Bond Solar | 2 MW | 25.9 km |
| Abbot Solar | 2 MW | 26 km |
| Jefferies | 145 MW | 28.3 km |