VOLTA GRANDE
Minas Gerais · GRANDE
Capacity
2,244 hm³
Coordinates
-20.033°N, 48.217°W
Operator
ONS
44.0% full
Current fill
44.0%vs 7 days ago
+0.7%gaining
vs 1 year ago
-51.1%year-over-year
7-day trend
→stable
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 July 28, 2026, VOLTA GRANDE is filled to 44.0% of its total capacity, holding roughly 118 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 held broadly steady (+0.7 pts), and it is 51.1 points below its level on the same date a year earlier.
Across the readings we hold for VOLTA GRANDE — 52 data points between August 15, 2025 and July 28, 2026 — the level has ranged from a low of 33.1% (January 2, 2026) to a high of 95.1% (August 15, 2025). On average the reservoir is fullest around October and at its lowest around January.
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
- 44.0%
- Water stored
- 118 hm³
- Total capacity
- 2,244 hm³
- Usable capacity
- 268 hm³
- 7-day change
- ▲ 0.7 pts
- Year-on-year
- ▼ 51.1 pts
- Primary use
- Hydroelectric power
- River
- GRANDE
- River basin
- GRANDE
- Operator
- ONS
- Coordinates
- 20.033°S, 48.217°W
- Last updated
- July 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Jul 2026 | 44.0% | 118 |
| 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 |
| 19 Jun 2026 | 54.9% | 147 |
| 12 Jun 2026 | 51.2% | 137 |
| 5 Jun 2026 | 44.7% | 120 |
| 29 May 2026 | 39.5% | 106 |
| 22 May 2026 | 48.3% | 130 |
| 15 May 2026 | 52.7% | 141 |
Frequently asked questions
What is the current water level of VOLTA GRANDE?
As of July 28, 2026, VOLTA GRANDE is at 44.0% of its capacity, holding approximately 118 hm³ of water, according to ONS – Operador Nacional do Sistema Elétrico data.
Is VOLTA GRANDE reservoir full?
No. As of July 28, 2026, VOLTA GRANDE is within its normal operating range at 44.0% of its capacity, so it is not full.
Is the water level at VOLTA GRANDE rising or falling?
The level at VOLTA GRANDE has been broadly stable over the latest week on record (+0.7 points).
How much water can VOLTA GRANDE hold?
VOLTA GRANDE has a total capacity of 2,244 hm³, of which about 268 hm³ is usable storage.
Where is VOLTA GRANDE reservoir located?
VOLTA GRANDE is located in Minas Gerais, Brazil, within the GRANDE basin (coordinates 20.033°S, 48.217°W).
What is VOLTA GRANDE used for?
VOLTA GRANDE is used primarily for hydroelectric power, and is managed by ONS.