VOLTA GRANDE
Minas Gerais · GRANDE
Capacity
2,244 hm³
Coordinates
-20.033°N, 48.217°W
Operator
ONS
97.5% full
Current fill
97.5%vs 7 days ago
+9.8%gaining
vs 1 year ago
N/A7-day trend
↑rising
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Technical specifications
| Total capacity | 2,244 hm³ |
| Usable capacity | 268 hm³ |
| Primary use | Hydroelectric |
| Operator | ONS |
| River | GRANDE |
| Province | Minas Gerais |
| River basin | GRANDE |
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. -20.033, -48.217 · Open in Google Maps
About VOLTA GRANDE
As of September 9, 2026, VOLTA GRANDE is filled to 97.5% of its total capacity, holding roughly 261 hm³ of water out of a maximum 2,244 hm³. At this level the reservoir is high. Of that total, about 268 hm³ is usable (live) storage.
Over the most recent week on record the fill level has risen by 9.8 percentage points.
Across the readings we hold for VOLTA GRANDE — 52 data points between September 26, 2025 and September 9, 2026 — the level has ranged from a low of 33.1% (January 2, 2026) to a high of 97.5% (September 9, 2026). On average the reservoir is fullest around October and at its lowest around August.
It is operated by ONS primarily for hydroelectric power. It lies within the GRANDE basin at 20.033°S, 48.217°W.
Key facts
- Current fill level
- 97.5%
- Water stored
- 261 hm³
- Total capacity
- 2,244 hm³
- Usable capacity
- 268 hm³
- 7-day change
- ▲ 9.8 pts
- Primary use
- Hydroelectric power
- River
- GRANDE
- River basin
- GRANDE
- Operator
- ONS
- Coordinates
- 20.033°S, 48.217°W
- Last updated
- September 9, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 9 Sep 2026 | 97.5% | 261 |
| 4 Sep 2026 | 87.8% | 235 |
| 28 Aug 2026 | 52.7% | 141 |
| 21 Aug 2026 | 39.5% | 106 |
| 14 Aug 2026 | 45.4% | 122 |
| 7 Aug 2026 | 34.7% | 93 |
| 31 Jul 2026 | 46.9% | 126 |
| 24 Jul 2026 | 43.2% | 116 |
| 17 Jul 2026 | 41.0% | 110 |
| 10 Jul 2026 | 66.0% | 177 |
| 3 Jul 2026 | 52.7% | 141 |
| 26 Jun 2026 | 49.8% | 133 |