VOLTA GRANDE
Minas Gerais · GRANDE
Useful capacity
268 hm³
Coordinates
20.033°S, 48.217°W
Operator
ONS
70.5% of useful capacity
Current fill
70.5%of useful capacity
vs 7 days ago
+6.7 ppgaining
vs 1 year ago
-11.2 ppyear-over-year
7-day trend
↑rising
Drought context
Storage vs October average
102%of normal
70.5% full on 2026-10-26, against an average of 68.8% for October across 2 years of readings (+1.7 points).
Rain over the last three months · 11 October 2026
Near normal
In the three months to 11 October 2026 the area around VOLTA GRANDE had rain close to normal for the season. Rainfall compared with the long-run record for the same season at this point (Copernicus Global Drought Observatory, SPI-3 index +0.64). Rain, not storage. Brazil drought figures →
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 |
| Province | Minas Gerais |
| River basin | GRANDE |
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 20.033°S, 48.217°W · Open in Google Maps
About VOLTA GRANDE
As of October 26, 2026, VOLTA GRANDE is at 70.5% of useful capacity, holding 189 hm³ of 268 hm³. Of the 2,244 hm³ total capacity, that is 8.4%. At this level the reservoir is within its normal operating range.
Over the most recent week on record the fill level has risen by 6.7 percentage points, and it is 11.2 points below its level on the same date a year earlier.
Across the readings we hold for VOLTA GRANDE — 65 data points between October 26, 2025 and October 26, 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
- 70.5% of useful capacity
- Water stored
- 189 hm³
- Total capacity
- 2,244 hm³
- Usable capacity
- 268 hm³
- 7-day change
- ▲ 6.7 pp
- Year-on-year
- ▼ 11.2 pp
- Primary use
- Hydroelectric power
- River basin
- GRANDE
- Operator
- ONS
- Coordinates
- 20.033°S, 48.217°W
- Last updated
- October 26, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 26 Oct 2026 | 70.5% | 189 |
| 25 Oct 2026 | 54.9% | 147.1 |
| 24 Oct 2026 | 59.3% | 159 |
| 23 Oct 2026 | 62.3% | 167 |
| 22 Oct 2026 | 60.1% | 161 |
| 21 Oct 2026 | 59.3% | 159 |
| 20 Oct 2026 | 64.5% | 173 |
| 19 Oct 2026 | 63.8% | 171 |
| 18 Oct 2026 | 61.6% | 165 |
| 17 Oct 2026 | 57.1% | 153 |
| 16 Oct 2026 | 56.3% | 151 |
| 15 Oct 2026 | 44.0% | 117.8 |