FURNAS
Minas Gerais · GRANDE
Capacity
22,950 hm³
Coordinates
-20.669°N, 46.314°W
Operator
ONS
61.5% full
Current fill
61.5%vs 7 days ago
-0.1%losing
vs 1 year ago
N/A7-day trend
→stable
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Technical specifications
| Total capacity | 22,950 hm³ |
| Usable capacity | 17,217 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. -20.669, -46.314 · Open in Google Maps
About FURNAS
As of September 12, 2026, FURNAS is filled to 61.5% of its total capacity, holding roughly 10,582 hm³ of water out of a maximum 22,950 hm³. At this level the reservoir is within its normal operating range. Of that total, about 17,217 hm³ is usable (live) storage.
Over the most recent week on record the fill level has held broadly steady (-0.1 pts).
Across the readings we hold for FURNAS — 52 data points between October 3, 2025 and September 12, 2026 — the level has ranged from a low of 28.7% (December 12, 2025) to a high of 67.3% (July 3, 2026). On average the reservoir is fullest around July and at its lowest around December.
It is operated by ONS primarily for hydroelectric power. It lies within the GRANDE basin at 20.669°S, 46.314°W.
Key facts
- Current fill level
- 61.5%
- Water stored
- 10,582 hm³
- Total capacity
- 22,950 hm³
- Usable capacity
- 17,217 hm³
- 7-day change
- ▼ 0.1 pts
- Primary use
- Hydroelectric power
- River
- GRANDE
- River basin
- GRANDE
- Operator
- ONS
- Coordinates
- 20.669°S, 46.314°W
- Last updated
- September 12, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 12 Sep 2026 | 61.5% | 10,582 |
| 11 Sep 2026 | 61.4% | 10,571 |
| 4 Sep 2026 | 61.5% | 10,594 |
| 28 Aug 2026 | 63.3% | 10,893 |
| 21 Aug 2026 | 64.6% | 11,127 |
| 14 Aug 2026 | 65.1% | 11,210 |
| 7 Aug 2026 | 66.2% | 11,398 |
| 31 Jul 2026 | 66.6% | 11,468 |
| 24 Jul 2026 | 66.8% | 11,492 |
| 17 Jul 2026 | 67.1% | 11,551 |
| 10 Jul 2026 | 67.2% | 11,575 |
| 3 Jul 2026 | 67.3% | 11,585 |