9th largest plant in Tennessee · 171st nationally
Johnsonville is a natural gas power plant in Tennessee with a nameplate capacity of 1,426 MW. It generates roughly 590.1k MWh per year — enough to power about 56,202 average U.S. homes.
Its capacity factor of 5% reflects intermittent or peaking operation. At 1671 lb CO₂/MWh, its emission rate sits above the national grid average of roughly 800 lb/MWh.
| Plant Name | Johnsonville |
|---|---|
| Operator | Tennessee Valley Authority |
| City | New Johnsonville |
| County | Humphreys County |
| State | Tennessee |
| ZIP | 37134 |
| Coordinates | 36.02780, -87.98610 |
This plant highlighted in navy-ringed pin; other generators within 25 miles shown as fuel-colored dots.
| ID | Technology | Fuel | Capacity | Status | Online |
|---|---|---|---|---|---|
| 10 | Conventional Steam Coal | Subbituminous Coal | 173 MW | Retired | 1959 |
| 7 | Conventional Steam Coal | Subbituminous Coal | 173 MW | Retired | 1958 |
| 8 | Conventional Steam Coal | Subbituminous Coal | 173 MW | Retired | 1959 |
| 9 | Conventional Steam Coal | Subbituminous Coal | 173 MW | Retired | 1959 |
| 5 | Conventional Steam Coal | Subbituminous Coal | 147 MW | Retired | 1952 |
| 6 | Conventional Steam Coal | Subbituminous Coal | 147 MW | Retired | 1953 |
| 1 | Conventional Steam Coal | Subbituminous Coal | 125 MW | Retired | 1951 |
| 2 | Conventional Steam Coal | Subbituminous Coal | 125 MW | Retired | 1951 |
| 3 | Conventional Steam Coal | Subbituminous Coal | 125 MW | Retired | 1952 |
| 4 | Conventional Steam Coal | Subbituminous Coal | 125 MW | Retired | 1952 |
| G17 | Natural Gas Fired Combustion Turbine | Natural Gas | 84.5 MW | Operating | 2000 |
| G18 | Natural Gas Fired Combustion Turbine | Natural Gas | 84.5 MW | Operating | 2000 |
| G19 | Natural Gas Fired Combustion Turbine | Natural Gas | 84.5 MW | Operating | 2000 |
| G20 | Natural Gas Fired Combustion Turbine | Natural Gas | 84.5 MW | Operating | 2000 |
| G10 | Natural Gas Fired Combustion Turbine | Natural Gas | 68.0 MW | Operating | 1975 |
| G11 | Natural Gas Fired Combustion Turbine | Natural Gas | 68.0 MW | Operating | 1975 |
| G12 | Natural Gas Fired Combustion Turbine | Natural Gas | 68.0 MW | Operating | 1975 |
| G13 | Natural Gas Fired Combustion Turbine | Natural Gas | 68.0 MW | Operating | 1975 |
| G14 | Natural Gas Fired Combustion Turbine | Natural Gas | 68.0 MW | Operating | 1975 |
| G15 | Natural Gas Fired Combustion Turbine | Natural Gas | 68.0 MW | Operating | 1975 |
| G16 | Natural Gas Fired Combustion Turbine | Natural Gas | 68.0 MW | Operating | 1975 |
| GT1 | Natural Gas Fired Combustion Turbine | Natural Gas | 68.0 MW | Operating | 1975 |
| GT2 | Natural Gas Fired Combustion Turbine | Natural Gas | 68.0 MW | Operating | 1975 |
| GT3 | Natural Gas Fired Combustion Turbine | Natural Gas | 68.0 MW | Operating | 1975 |
| GT4 | Natural Gas Fired Combustion Turbine | Natural Gas | 68.0 MW | Operating | 1975 |
| GT5 | Natural Gas Fired Combustion Turbine | Natural Gas | 68.0 MW | Operating | 1975 |
| GT6 | Natural Gas Fired Combustion Turbine | Natural Gas | 68.0 MW | Operating | 1975 |
| GT7 | Natural Gas Fired Combustion Turbine | Natural Gas | 68.0 MW | Operating | 1975 |
| GT8 | Natural Gas Fired Combustion Turbine | Natural Gas | 68.0 MW | Operating | 1975 |
| GT9 | Natural Gas Fired Combustion Turbine | Natural Gas | 68.0 MW | Operating | 1975 |
| G21 | Natural Gas Fired Combustion Turbine | Natural Gas | 65.8 MW | Under Construction | — |
| G22 | Natural Gas Fired Combustion Turbine | Natural Gas | 65.8 MW | Under Construction | — |
| G23 | Natural Gas Fired Combustion Turbine | Natural Gas | 65.8 MW | Under Construction | — |
| G24 | Natural Gas Fired Combustion Turbine | Natural Gas | 65.8 MW | Under Construction | — |
| G25 | Natural Gas Fired Combustion Turbine | Natural Gas | 65.8 MW | Under Construction | — |
| G26 | Natural Gas Fired Combustion Turbine | Natural Gas | 65.8 MW | Under Construction | — |
| G27 | Natural Gas Fired Combustion Turbine | Natural Gas | 65.8 MW | Under Construction | — |
| G28 | Natural Gas Fired Combustion Turbine | Natural Gas | 65.8 MW | Under Construction | — |
| G29 | Natural Gas Fired Combustion Turbine | Natural Gas | 65.8 MW | Under Construction | — |
| G30 | Natural Gas Fired Combustion Turbine | Natural Gas | 65.8 MW | Under Construction | — |
| CO₂ | 493.1k metric tons |
|---|---|
| SO₂ | 15 metric tons |
| NOₓ | 108 metric tons |
| CO₂ Rate | 1671 lb/MWh |
Annual totals and CO₂ rate reported by EPA eGRID for 2023. Reference averages are approximate U.S.-wide figures from the same dataset.
| NERC Region | SERC |
|---|---|
| Balancing Authority | Tennessee Valley Authority |
Natural gas plants are the workhorse of the modern grid. Combined-cycle units achieve very high efficiency and can ramp up and down quickly to balance variable renewables. They emit roughly half the CO₂ per MWh of coal and far less of other pollutants, but they still release upstream methane during fuel extraction.