Power plant · EIA plant code 3406
Johnsonville
- Operator
- Tennessee Valley Authority
- Location
- Humphreys, TN (county level only)
- Balancing authority
- Tennessee Valley Authority (TVA)
- Nameplate capacity
- 1,676 MW
- Summer capacity
- 1,292.2 MW
Planned changes reported to EIA: 10 planned retirements.
U.S. Energy Information Administration · Annual Electric Generator Report (Form EIA-860) · data for 2025 · as of Sep 10, 2026 · retrieved Oct 31, 2026 · CC-BY-4.0 May be out of date. The next release was due by Sep 10, 2027. Last checked for an update: Oct 31, 2026.
Generation in 2025
- Net generation
- 1,433,228 MWh
- Capacity factor
- 10.6%
Capacity factor is net generation divided by nameplate capacity times the hours each generator was in service that year, counted by month.
U.S. Energy Information Administration · Power Plant Operations Report (Form EIA-923) · data for 2025 · as of Sep 11, 2026 · retrieved Oct 31, 2026 · CC-BY-4.0 May be out of date. The next release was due by Sep 11, 2027. Last checked for an update: Oct 31, 2026.
Emissions
- Carbon dioxide in 2023
- 447,356 metric tons
- Carbon dioxide per MWh
- 1,671 lb/MWh
eGRID reports 493,125 short tons. One short ton is 0.90718474 metric tons.
Emissions are for 2023, the newest eGRID year. Generation is for 2025, the newest EIA-923 year.
U.S. Environmental Protection Agency · Emissions & Generation Resource Integrated Database (eGRID) · data for 2023 · as of Jun 16, 2025 · retrieved Oct 31, 2026 · CC-BY-4.0 May be out of date. The next release was due by Jan 31, 2026. Last checked for an update: Oct 31, 2026.
Generators
| Generator | Technology | Energy source | Nameplate | Operating since | Status |
|---|---|---|---|---|---|
| G10 | Natural Gas Fired Combustion Turbine | NG | 68 MW | 1975 | Operable · Planned retirement: 2028 (reported to EIA) · As of September 2026 (EIA-860M): (OP) Operating |
| G11 | Natural Gas Fired Combustion Turbine | NG | 68 MW | 1975 | Operable · Planned retirement: 2028 (reported to EIA) · As of September 2026 (EIA-860M): (OP) Operating |
| G12 | Natural Gas Fired Combustion Turbine | NG | 68 MW | 1975 | Operable · Planned retirement: 2028 (reported to EIA) · As of September 2026 (EIA-860M): (OP) Operating |
| G13 | Natural Gas Fired Combustion Turbine | NG | 68 MW | 1975 | Operable · Planned retirement: 2028 (reported to EIA) · As of September 2026 (EIA-860M): (OP) Operating |
| G14 | Natural Gas Fired Combustion Turbine | NG | 68 MW | 1975 | Operable · Planned retirement: 2028 (reported to EIA) · As of September 2026 (EIA-860M): (OP) Operating |
| G15 | Natural Gas Fired Combustion Turbine | NG | 68 MW | 1975 | Operable · Planned retirement: 2028 (reported to EIA) · As of September 2026 (EIA-860M): (OP) Operating |
| G16 | Natural Gas Fired Combustion Turbine | NG | 68 MW | 1975 | Operable · Planned retirement: 2028 (reported to EIA) · As of September 2026 (EIA-860M): (OP) Operating |
| G17 | Natural Gas Fired Combustion Turbine | NG | 84.5 MW | 2000 | Operable · As of September 2026 (EIA-860M): (OP) Operating |
| G18 | Natural Gas Fired Combustion Turbine | NG | 84.5 MW | 2000 | Operable · As of September 2026 (EIA-860M): (OP) Operating |
| G19 | Natural Gas Fired Combustion Turbine | NG | 84.5 MW | 2000 | Operable · As of September 2026 (EIA-860M): (OP) Operating |
| G20 | Natural Gas Fired Combustion Turbine | NG | 84.5 MW | 2000 | Operable · As of September 2026 (EIA-860M): (OP) Operating |
| G21 | Natural Gas Fired Combustion Turbine | NG | 65.8 MW | 2025 | Operable · As of September 2026 (EIA-860M): (OP) Operating |
| G22 | Natural Gas Fired Combustion Turbine | NG | 65.8 MW | 2025 | Operable · As of September 2026 (EIA-860M): (OP) Operating |
| G23 | Natural Gas Fired Combustion Turbine | NG | 65.8 MW | 2025 | Operable · As of September 2026 (EIA-860M): (OP) Operating |
| G24 | Natural Gas Fired Combustion Turbine | NG | 65.8 MW | 2025 | Operable · As of September 2026 (EIA-860M): (OP) Operating |
| G25 | Natural Gas Fired Combustion Turbine | NG | 65.8 MW | 2025 | Operable · As of September 2026 (EIA-860M): (OP) Operating |
| G26 | Natural Gas Fired Combustion Turbine | NG | 65.8 MW | 2025 | Operable · As of September 2026 (EIA-860M): (OP) Operating |
| G27 | Natural Gas Fired Combustion Turbine | NG | 65.8 MW | 2025 | Operable · As of September 2026 (EIA-860M): (OP) Operating |
| G28 | Natural Gas Fired Combustion Turbine | NG | 65.8 MW | 2025 | Operable · As of September 2026 (EIA-860M): (OP) Operating |
| G29 | Natural Gas Fired Combustion Turbine | NG | 65.8 MW | 2025 | Operable · As of September 2026 (EIA-860M): (OP) Operating |
| G30 | Natural Gas Fired Combustion Turbine | NG | 65.8 MW | 2025 | Operable · As of September 2026 (EIA-860M): (OP) Operating |
| GT1 | Natural Gas Fired Combustion Turbine | NG | 68 MW | 1975 | Operable · Planned retirement: 2028 (reported to EIA) · As of September 2026 (EIA-860M): (OP) Operating |
| GT2 | Natural Gas Fired Combustion Turbine | NG | 68 MW | 1975 | Operable · Planned retirement: 2028 (reported to EIA) · As of September 2026 (EIA-860M): (OP) Operating |
| GT3 | Natural Gas Fired Combustion Turbine | NG | 68 MW | 1975 | Operable · Planned retirement: 2028 (reported to EIA) · As of September 2026 (EIA-860M): (OP) Operating |
| GT4 | Natural Gas Fired Combustion Turbine | NG | 68 MW | 1975 | Retired in 2025 · As of September 2026 (EIA-860M): retired |
| GT5 | Natural Gas Fired Combustion Turbine | NG | 68 MW | 1975 | Retired in 2025 · As of September 2026 (EIA-860M): retired |
| GT6 | Natural Gas Fired Combustion Turbine | NG | 68 MW | 1975 | Retired in 2025 · As of September 2026 (EIA-860M): retired |
| GT7 | Natural Gas Fired Combustion Turbine | NG | 68 MW | 1975 | Retired in 2025 · As of September 2026 (EIA-860M): retired |
| GT8 | Natural Gas Fired Combustion Turbine | NG | 68 MW | 1975 | Retired in 2025 · As of September 2026 (EIA-860M): retired |
| GT9 | Natural Gas Fired Combustion Turbine | NG | 68 MW | 1975 | Retired in 2025 · As of September 2026 (EIA-860M): retired |
U.S. Energy Information Administration · Monthly Update to the Annual Electric Generator Report (Form EIA-860M) · data for 2026-09 · as of Oct 23, 2026 · retrieved Oct 31, 2026 · CC-BY-4.0 May be out of date. The next release was due by Nov 23, 2026. Last checked for an update: Oct 31, 2026.