Old Hickory
Hydro power plant · Sumner County, Tennessee
Nameplate capacity
104 MW
Rank in Tennessee
#29
of 106 plants
In service since
1957
April 1957
Details
- Primary fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Operator
- USCE-Nashville District
- County
- Sumner County
- Generating units
- 4
- Share of state capacity
- 0.44%
- Rank among hydro plants in Tennessee
- #13 of 29
- EIA plant code
- 3426
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 1 | Conventional Hydroelectric | 29 MW | 29 MW | 1957 | Operating |
| 2 | Conventional Hydroelectric | 25 MW | 29 MW | 1957 | Operating |
| 3 | Conventional Hydroelectric | 25 MW | 29 MW | 1957 | Operating |
| 4 | Conventional Hydroelectric | 25 MW | 29 MW | 1957 | Operating |
Nameplate is the maximum rated output; summer capacity is what the unit can reliably deliver on a hot day, which is typically lower.
Similarly sized plants in Tennessee
| Boone Dam | Hydro | 106 MW |
| Nickajack | Hydro | 104 MW |
| OETN1 | Solar | 100 MW |
| Cordell Hull | Hydro | 100 MW |
About this data
From EIA’s inventory of operable generators, May 2026 release. Capacity is nameplate — the maximum rated output of the equipment, not what the plant actually generates over a year, which depends on how often it runs. A 104 MW solar plant and a 104 MW nuclear plant have the same entry here and produce very different amounts of electricity.
“In service since” is the earliest in-service date among the units still listed, so a site rebuilt around newer equipment can read as younger than the site itself. All Tennessee power plants · What Tennessee actually generates