VOLTA GRANDE
Minas Gerais · GRANDE
Capacity
2,244 hm³
Coordinates
-20.033°N, 48.217°W
Operator
ONS
Current fill
46.9%vs 7 days ago
+2.2%gaining
vs 1 year ago
-25.9%year-over-year
7-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 June 10, 2026, VOLTA GRANDE is filled to 46.9% of its total capacity, holding roughly 126 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 risen by 2.2 percentage points, and it is 25.9 points below its level on the same date a year earlier.
Across the readings we hold for VOLTA GRANDE — 52 data points between June 27, 2025 and June 10, 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
- 46.9%
- Water stored
- 126 hm³
- Total capacity
- 2,244 hm³
- Usable capacity
- 268 hm³
- 7-day change
- ▲ 2.2 pts
- Year-on-year
- ▼ 25.9 pts
- Primary use
- Hydroelectric power
- River
- GRANDE
- River basin
- GRANDE
- Operator
- ONS
- Coordinates
- 20.033°S, 48.217°W
- Last updated
- June 10, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 10 Jun 2026 | 46.9% | 126 |
| 5 Jun 2026 | 44.7% | 120 |
| 29 May 2026 | 39.5% | 106 |
| 22 May 2026 | 48.3% | 130 |
| 15 May 2026 | 52.7% | 141 |
| 8 May 2026 | 64.5% | 173 |
| 1 May 2026 | 70.5% | 189 |
| 24 Apr 2026 | 85.1% | 228 |
| 17 Apr 2026 | 71.3% | 191 |
| 10 Apr 2026 | 75.0% | 201 |
| 3 Apr 2026 | 70.5% | 189 |
| 27 Mar 2026 | 57.1% | 153 |
Frequently asked questions
What is the current water level of VOLTA GRANDE?
As of June 10, 2026, VOLTA GRANDE is at 46.9% of its capacity, holding approximately 126 hm³ of water, according to ONS – Operador Nacional do Sistema Elétrico data.
Is VOLTA GRANDE reservoir full?
No. As of June 10, 2026, VOLTA GRANDE is within its normal operating range at 46.9% of its capacity, so it is not full.
Is the water level at VOLTA GRANDE rising or falling?
The level at VOLTA GRANDE is rising — it gained 2.2 percentage points over the latest week on record.
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.