FURNAS
Minas Gerais · GRANDE
Capacity
22,950 hm³
Coordinates
-20.669°N, 46.314°W
Operator
ONS
66.9% full
Current fill
66.9%vs 7 days ago
+0.1%gaining
vs 1 year ago
+8.3%year-over-year
7-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 July 28, 2026, FURNAS is filled to 66.9% of its total capacity, holding roughly 11,515 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), and it is 8.3 points above its level on the same date a year earlier.
Across the readings we hold for FURNAS — 52 data points between August 15, 2025 and July 28, 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
- 66.9%
- Water stored
- 11,515 hm³
- Total capacity
- 22,950 hm³
- Usable capacity
- 17,217 hm³
- 7-day change
- ▲ 0.1 pts
- Year-on-year
- ▲ 8.3 pts
- Primary use
- Hydroelectric power
- River
- GRANDE
- River basin
- GRANDE
- Operator
- ONS
- Coordinates
- 20.669°S, 46.314°W
- Last updated
- July 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Jul 2026 | 66.9% | 11,515 |
| 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 |
| 26 Jun 2026 | 66.6% | 11,468 |
| 19 Jun 2026 | 66.2% | 11,398 |
| 12 Jun 2026 | 65.6% | 11,293 |
| 5 Jun 2026 | 65.1% | 11,210 |
| 29 May 2026 | 64.4% | 11,081 |
| 22 May 2026 | 63.5% | 10,940 |
| 15 May 2026 | 63.0% | 10,845 |
Frequently asked questions
What is the current water level of FURNAS?
As of July 28, 2026, FURNAS is at 66.9% of its capacity, holding approximately 11,515 hm³ of water, according to ONS – Operador Nacional do Sistema Elétrico data.
Is FURNAS reservoir full?
No. As of July 28, 2026, FURNAS is within its normal operating range at 66.9% of its capacity, so it is not full.
Is the water level at FURNAS rising or falling?
The level at FURNAS has been broadly stable over the latest week on record (+0.1 points).
How much water can FURNAS hold?
FURNAS has a total capacity of 22,950 hm³, of which about 17,217 hm³ is usable storage.
Where is FURNAS reservoir located?
FURNAS is located in Minas Gerais, Brazil, within the GRANDE basin (coordinates 20.669°S, 46.314°W).
What is FURNAS used for?
FURNAS is used primarily for hydroelectric power, and is managed by ONS.