Global GridGuam's energy mix and electricity
🇬🇺 In 2024, Guam generated 1.86 TWh of electricity. Almost all of it, 91%, came from oil and other fossil fuels. In total, 8.6% came from low-carbon sources (nuclear and renewables) and 91% from fossil fuels.
On average, each kilowatt hour produced about 608 grams of carbon dioxide (CO₂), above the world average of 458 grams in 2025. That makes Guam the 127th cleanest of 158 countries that generate at least 1 TWh a year.
Electricity demand was 1.86 TWh. Its electricity imports and exports were roughly in balance.
Since 2000, electricity generation has stayed about the same, from 1.94 TWh. The low-carbon share went from 0% to 9%. The biggest rise was in solar, from 0% to 9% of generation. The biggest fall was in oil and other fossil fuels, from 100% to 91%. Carbon intensity fell from 660 to 608 grams per kWh.
Live, hour-by-hour figures for Guam are not connected yet. The dashboard shows its yearly figures, energy mix since 2000 and interconnector trade.
Energy mix in 2024
- Oil and other fossil fuels 91%
- Solar 8.6%
| Source | Share | Generated |
|---|---|---|
| Oil and other fossil fuels | 91% | 1.70 TWh |
| Solar | 8.6% | 0.16 TWh |
Energy security score
Vulnerable. Guam ranks 147th of 158 countries and 6th of 6 in Oceania. The score shows how well a country could keep electricity affordable and on if fuel supplies were disrupted. It is based on 4 of the 5 measures.
| Measure | Score |
|---|---|
| Produces its own energy No reliable figure exists for Guam, so this measure is left out and the other four count for more. | n/a |
| Variety of power sources How evenly generation is spread across nine sources. The largest, oil and other fossil fuels, made 91%. | 18 |
| Little reliance on imported power Guam exported more electricity than it imported, so it scores full marks. | 100 |
| Low-carbon power Nuclear and renewables made 8.6% of generation. | 9 |
| Low gas and oil use Gas and oil made 91% of generation; the score is 100 minus that share. | 9 |
The five measures are weighted 30%, 20%, 20%, 15% and 15%. How the score works.
How it has changed
| Year | Generated | Low-carbon | Fossil | CO₂ g/kWh |
|---|---|---|---|---|
| 2000 | 1.94 TWh | 0% | 100% | 660 |
| 2005 | 1.90 TWh | 0% | 100% | 658 |
| 2010 | 1.87 TWh | 0% | 100% | 658 |
| 2015 | 1.71 TWh | 2% | 98% | 649 |
| 2020 | 1.71 TWh | 5% | 95% | 626 |
| 2023 | 1.80 TWh | 8% | 92% | 611 |
| 2024 | 1.86 TWh | 9% | 91% | 608 |
Questions about Guam's energy
What is Guam's energy mix?
In 2024, Guam's electricity came from oil and other fossil fuels 91% and solar 8.6%.
How much of Guam's electricity is renewable?
8.6% of its electricity came from renewables in 2024 (solar 8.6%).
What is Guam's main source of electricity?
Oil and other fossil fuels, which made 91% of its electricity in 2024.
How clean is Guam's electricity?
About 608 grams of CO₂ for each kilowatt hour in 2024, above the world average of 458 grams. It ranks 127th cleanest of 158 countries that generate at least 1 TWh a year.
Does Guam import electricity?
Its imports and exports were roughly in balance in 2024.
How secure is Guam's energy supply?
Global Grid's energy security score for Guam is 37 out of 100 (vulnerable), 147th of 158 countries. It looks at how much of its own energy it produces, how varied its power sources are, its reliance on imported power and its use of low-carbon power, gas and oil.
Other countries in Oceania
- 🇦🇺 Australia
- 🇳🇿 New Zealand
- 🇵🇬 Papua New Guinea
- 🇳🇨 New Caledonia
- 🇫🇯 Fiji
- 🇵🇫 French Polynesia
- 🇦🇸 American Samoa
- 🇼🇸 Samoa
Sources: Ember yearly electricity data (CC BY 4.0), figures up to 2024. Ember's latest-year figures are first estimates and may be revised. TWh: terawatt hours (one billion kWh).