Saint Helena, Ascension and Tristan da Cunha energy mix & electricity
Power plants in Saint Helena, Ascension and Tristan da Cunha produced 10 GWh of electricity in 2023. The supply is entirely oil (100%).
The power system is very small (under 1 TWh a year), so it is not included in share-based world rankings. A single plant can change its mix dramatically from one year to the next.
Electricity generation by source in 2023
Share of electricity generation by source, with the change in percentage points over the last ten years.
| Source | TWh | Share | 10-yr Δ pp |
|---|---|---|---|
| Oil | 0.01 | 100% | 0 |
| Total | 0.01 | 100% |
Saint Helena, Ascension and Tristan da Cunha: electricity in context
Power plants in Saint Helena, Ascension and Tristan da Cunha produced 10 GWh of electricity in 2023. That puts it in the same league as Falkland Islands. The supply is entirely oil (100%).
The renewable share stood at 0%. That is 34 points below the world average of 33.8%. It is also below the average for Africa (24.7%). Generating one kWh emits about 1,000 g CO₂e here (world average: 458 g). That makes it one of the most carbon-intensive grids in the world.
Wind and solar have barely started in Saint Helena, Ascension and Tristan da Cunha: combined, they produce less than 1% of the power.
Generation per person is 1,881 kWh a year, 49% of the world average of 3,860 kWh. Saint Helena, Ascension and Tristan da Cunha does not trade electricity with other countries: the grid is not interconnected with any neighbour.
How the power mix has changed
Electricity generation by source since 2000. Switch to shares to see the structural shift independent of demand growth.
Solar & wind farms: Saint Helena, Ascension and Tristan da Cunha
1 utility-scale facilities tracked by Global Energy Monitor (2026): 0 MW of solar and 0 MW of wind operating, plus 3 MW under construction or planned.
See them on the mapLargest solar & wind farms: Saint Helena, Ascension and Tristan da Cunha →
How does Saint Helena, Ascension and Tristan da Cunha compare?
Saint Helena, Ascension and Tristan da Cunha next to 6 neighbouring countries, plus regional and world averages. Click a column to sort; use “Compare” for full side-by-side charts.
| Country | Renewable % | Low-carbon % | Fossil % | gCO₂/kWh | kWh / person | Generation TWh | Mix | |
|---|---|---|---|---|---|---|---|---|
| Saint Helena, Ascension and Tristan da Cunha | 0% | 0% | 100% | 1,000 | 1,881 | 0 | — | |
| Namibia | 97.6% | 97.6% | 2.4% | 49 | 541 | 1.6 | Compare | |
| Liberia | 54.4% | 54.4% | 45.6% | 316 | 102 | 0.6 | Compare | |
| Gabon | 35.4% | 35.4% | 64.6% | 523 | 1,024 | 2.6 | Compare | |
| Angola | 73.7% | 73.7% | 26.3% | 185 | 412 | 15.6 | Compare | |
| Equatorial Guinea | 26.8% | 26.8% | 73.2% | 644 | 787 | 1.5 | Compare | |
| Côte d'Ivoire | 28.9% | 28.9% | 71.1% | 405 | 338 | 10.8 | Compare | |
| Africa average | 24.7% | 25.5% | 74.5% | 544 | 635 | 962 | Compare | |
| World average | 33.8% | 42.6% | 57.4% | 458 | 3,860 | 31,772 | Compare |
Calculators for Saint Helena, Ascension and Tristan da Cunha
Saint Helena, Ascension and Tristan da Cunha energy: frequently asked questions
What percentage of electricity in Saint Helena, Ascension and Tristan da Cunha is renewable?
What is the main source of electricity in Saint Helena, Ascension and Tristan da Cunha?
How clean is the electricity in Saint Helena, Ascension and Tristan da Cunha?
How much electricity does Saint Helena, Ascension and Tristan da Cunha use per person?
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Sources & references
- Our World in Data: Energy dataset (CC BY 4.0) — compiled from the sources below
- Ember: Yearly Electricity Data — generation, shares, carbon intensity
- Energy Institute: Statistical Review of World Energy — primary energy, fossil production
- U.S. Energy Information Administration: International Energy Data — gap-filling for smaller countries
- World Resources Institute: Global Power Plant Database v1.3 (CC BY 4.0) — power plant locations and capacity
Electricity data: Ember and Energy Institute Statistical Review via Our World in Data (CC BY 4.0); latest year 2023. Power plants: WRI Global Power Plant Database (CC BY 4.0). Rankings exclude systems under 1 TWh and values older than 2020. Figures may be revised by the original publishers.