VOLTA GRANDE
Minas Gerais · GRANDE
Capacity
2,244 hm³
Coordinates
-20.033°N, 48.217°W
Operator
ONS
51.2% full
Current fill
51.2%vs 7 days ago
-8.1%losing
vs 1 year ago
N/A7-day trend
↓falling
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 October 7, 2026, VOLTA GRANDE is filled to 51.2% of its total capacity, holding roughly 137 hm³ of water out of a maximum 2,244 hm³. At this level the reservoir is within its normal operating range. Of that total, about 268 hm³ is usable (live) storage.
Over the most recent week on record the fill level has fallen by 8.1 percentage points.
Across the readings we hold for VOLTA GRANDE — 52 data points between October 24, 2025 and October 7, 2026 — the level has ranged from a low of 33.1% (January 2, 2026) to a high of 95.9% (September 11, 2026). On average the reservoir is fullest around September 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
- 51.2%
- Water stored
- 137 hm³
- Total capacity
- 2,244 hm³
- Usable capacity
- 268 hm³
- 7-day change
- ▼ 8.1 pts
- Primary use
- Hydroelectric power
- River
- GRANDE
- River basin
- GRANDE
- Operator
- ONS
- Coordinates
- 20.033°S, 48.217°W
- Last updated
- October 7, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 7 Oct 2026 | 51.2% | 137 |
| 2 Oct 2026 | 59.3% | 159 |
| 25 Sep 2026 | 85.1% | 228 |
| 18 Sep 2026 | 93.4% | 250 |
| 11 Sep 2026 | 95.9% | 257 |
| 4 Sep 2026 | 88.4% | 237 |
| 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 |