TNSG South Plant
North Slope County, Alaska · EIA plant ID 58117 · Operator: TDX North Slope Generating Inc.
Nameplate8MWSummer 7 MW
Generators5in service
Net generation-0GWh12 mo to Dec 2025
Capacity factor-0%!gas/coal/oil units, summer MW
Heat rate—Btu/kWhfossil units, electric fuel, HHV
First online1992Runs as rarely runs
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), gas/coal/oil 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.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2012 | 35.6 | 48.2% | 11,653 |
| 2013 | 10.7 | 14.5% | 10,183 |
| 2014 | 9.1 | 21.6% | 9,056 |
| 2015 | 0.8 | 1.9% | 13,406 |
| 2016 | 0 | 0.0% | — |
| 2017 | -0.6 | -1.4% | — |
| 2018 | -0.5 | -1.1% | — |
| 2019 | -0.2 | -0.4% | — |
| 2020 | -0.5 | -0.8% | — |
| 2021 | -0.4 | -0.6% | — |
| 2022 | -0.3 | -0.5% | — |
| 2023 | -0.3 | -0.5% | — |
| 2024 | -0.3 | -0.5% | — |
| 2025 | -0.3 | -0.5% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| 1A | Natural Gas Internal Combustion Engine | IC | 1.4 | 1.3 | Sep 2006 | Operating | — | coming soon |
| 2 | Natural Gas Internal Combustion Engine | IC | 0.8 | 0.8 | Jan 1992 | Operating | — | coming soon |
| 3 | Natural Gas Internal Combustion Engine | IC | 0.8 | 0.8 | Jan 1992 | Operating | — | coming soon |
| 4A | Natural Gas Internal Combustion Engine | IC | 1.4 | 1.3 | Sep 2006 | Operating | — | coming soon |
| 6 | Natural Gas Internal Combustion Engine | IC | 3.4 | 3 | Oct 2003 | Operating | — | coming soon |
| 12 | Natural Gas Internal Combustion Engine | IC | 0.6 | 0.6 | Aug 2010 | Retired Jan 2012 | — | coming soon |
Owner / operator
Operator: TDX North Slope Generating Inc.. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| TDX North Slope Generating Inc. | 100.0% | 8 MW |
Nearby plants
Within 80 km.
| TNSG North Plant | 26 MW | 5 km |