Installed solar energy capacity in Tonga
Tonga: Installed solar energy capacity was 0.0158 gigawatts in 2025. ◆ Volatile
Installed solar energy capacity in Tonga, 2000–2025
Source: IRENA (2026) – processed by Our World in Data. Measured in gigawatts.
Analysis
In 2025, installed solar energy capacity in Tonga stood at 0.0158 gigawatts. That is the highest value across all 26 years on record.
That represents a change of up 1.5% on the previous year and up 320.5% over ten years.
Over the whole period, installed solar energy capacity in Tonga peaked at 0.0158 gigawatts in 2025 and was at its lowest, 0.0001 gigawatts, in 2000.
Tonga ranks 166th of 218 countries on this measure, in the bottom quarter.
The series is highly variable year to year, so single readings are best treated with caution.
Installed solar energy capacity in Tonga, year by year
| Year | gigawatts | Change |
|---|---|---|
| 2000 | 0.0001 gigawatts | — |
| 2001 | 0.0001 gigawatts | +0.0% |
| 2002 | 0.0001 gigawatts | +47.4% |
| 2003 | 0.0001 gigawatts | +0.0% |
| 2004 | 0.0001 gigawatts | +0.0% |
| 2005 | 0.0001 gigawatts | +0.0% |
| 2006 | 0.0001 gigawatts | +32.1% |
| 2007 | 0.0001 gigawatts | +0.0% |
| 2008 | 0.0001 gigawatts | +9.9% |
| 2009 | 0.0001 gigawatts | +7.4% |
| 2010 | 0.0001 gigawatts | +0.0% |
| 2011 | 0.0003 gigawatts | +137.4% |
| 2012 | 0.002 gigawatts | +543.7% |
| 2013 | 0.0027 gigawatts | +35.3% |
| 2014 | 0.0027 gigawatts | +0.2% |
| 2015 | 0.0037 gigawatts | +38.2% |
| 2016 | 0.0045 gigawatts | +21.0% |
| 2017 | 0.0067 gigawatts | +47.8% |
| 2018 | 0.007 gigawatts | +4.6% |
| 2019 | 0.007 gigawatts | +0.0% |
| 2020 | 0.007 gigawatts | +0.0% |
| 2021 | 0.007 gigawatts | +0.0% |
| 2022 | 0.0143 gigawatts | +104.0% |
| 2023 | 0.0151 gigawatts | +5.6% |
| 2024 | 0.0155 gigawatts | +2.9% |
| 2025 | 0.0158 gigawatts | +1.5% |
Tonga compared with similar countries
- Tonga's 0.0158 gigawatts is below the median for upper middle income countries, which is 0.3169 gigawatts, 5% of the median. (57 countries reporting)
- Tonga's 0.0158 gigawatts is below the median for East Asia & Pacific, which is 0.1563 gigawatts, 10% of the median. (35 countries reporting)
Biggest year-on-year movements
Years where Installed solar energy capacity in Tonga changed far more than this series normally does. A large move can be a real event or a change in how the figure was measured — the source note below says who published it.
| Year | Change | From | To |
|---|---|---|---|
| 2012 | +543.7% | 0.0003 gigawatts | 0.002 gigawatts |
| 2011 | +137.4% | 0.0001 gigawatts | 0.0003 gigawatts |
| 2022 | +104.0% | 0.007 gigawatts | 0.0143 gigawatts |
| 2017 | +47.8% | 0.0045 gigawatts | 0.0067 gigawatts |
| 2002 | +47.4% | 0.0001 gigawatts | 0.0001 gigawatts |
Averages by decade
| Decade | Average | Lowest | Highest | Years |
|---|---|---|---|---|
| 2000s | 0.0001 gigawatts | 0.0001 gigawatts | 0.0001 gigawatts | 10 |
| 2010s | 0.0037 gigawatts | 0.0001 gigawatts | 0.007 gigawatts | 10 |
| 2020s | 0.0125 gigawatts | 0.007 gigawatts | 0.0158 gigawatts | 6 |
Countries ranked near Tonga
- 163 Sierra Leone 0.0174 gigawatts compare
- 164 Guinea 0.0173 gigawatts compare
- 165 Saint Martin (French part) 0.0171 gigawatts compare
- 167 Samoa 0.0157 gigawatts compare
- 168 Antigua and Barbuda 0.0156 gigawatts compare
- 169 Rwanda 0.0154 gigawatts compare
More energy & mining data for Tonga
- Fossil fuel consumption by fuel, per unit of GDP 0 terawatt-hours per US$ of GDP (2024)
- Primary energy use, annual growth rate 8.74 % change on previous year (2024)
- Coal consumption, per capita 0 terawatt-hours per person (2024)
- Coal consumption, per unit of GDP 0 terawatt-hours per US$ of GDP (2024)
- Primary energy use, per unit of GDP 0 terawatt-hours per US$ of GDP (2024)
- Primary energy use, per capita 0 terawatt-hours per person (2024)
- Coal production, per capita 0 terawatt-hours per person (2024)
- Coal production, per unit of GDP 0 terawatt-hours per US$ of GDP (2024)
- Fossil fuel consumption by fuel, per capita 0 terawatt-hours per person (2024)
- Fuel imports 16.4% (2023)
Frequently asked questions
- What is installed solar energy capacity in Tonga?
- Installed solar energy capacity in Tonga was 0.0158 gigawatts in 2025, according to IRENA (2026) – processed by Our World in Data.
- What is the highest installed solar energy capacity recorded in Tonga?
- The highest recorded value was 0.0158 gigawatts in 2025.
- What is the lowest installed solar energy capacity recorded in Tonga?
- The lowest recorded value was 0.0001 gigawatts in 2000.
- How does Tonga rank for installed solar energy capacity?
- Tonga ranks 166th out of 218 countries with data for 2025.
- Is installed solar energy capacity rising or falling in Tonga?
- Over the last ten years it is up 320.5%. The long-run trend across the full record is volatile.
- Where does this Tonga data come from?
- The figures come from IRENA (2026) – processed by Our World in Data, published as part of Installed solar energy capacity. Statizoid updates them automatically from the source API.
Download this data
CSV · JSON — 26 observations, free to reuse under CC BY 4.0 (Our World in Data).
About this data
Total solar (on- and off-grid) electricity installed capacity, measured in gigawatts. This includes solar photovoltaic and concentrated solar power.