CACU
Goiás · PARANAIBA
Capacity
227.45 hm³
Coordinates
-18.532°N, 51.149°W
Operator
ONS
97.4% full
Current fill
97.4%vs 7 days ago
+0.5%gaining
vs 1 year ago
N/A7-day trend
→stable
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Technical specifications
| Total capacity | 227.45 hm³ |
| Usable capacity | 31.69 hm³ |
| Primary use | Hydroelectric |
| Operator | ONS |
| River | CLARO |
| Province | Goiás |
| River basin | PARANAIBA |
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. -18.532, -51.149 · Open in Google Maps
About CACU
As of September 9, 2026, CACU is filled to 97.4% of its total capacity, holding roughly 31 hm³ of water out of a maximum 227 hm³. At this level the reservoir is high. Of that total, about 32 hm³ is usable (live) storage.
Over the most recent week on record the fill level has held broadly steady (+0.5 pts).
Across the readings we hold for CACU — 52 data points between September 26, 2025 and September 9, 2026 — the level has ranged from a low of 64.4% (February 20, 2026) to a high of 100.0% (April 10, 2026). On average the reservoir is fullest around September and at its lowest around February.
It is operated by ONS primarily for hydroelectric power. It lies within the PARANAIBA basin at 18.532°S, 51.149°W.
Key facts
- Current fill level
- 97.4%
- Water stored
- 31 hm³
- Total capacity
- 227 hm³
- Usable capacity
- 32 hm³
- 7-day change
- ▲ 0.5 pts
- Primary use
- Hydroelectric power
- River
- CLARO
- River basin
- PARANAIBA
- Operator
- ONS
- Coordinates
- 18.532°S, 51.149°W
- Last updated
- September 9, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 9 Sep 2026 | 97.4% | 31 |
| 4 Sep 2026 | 96.8% | 31 |
| 28 Aug 2026 | 93.2% | 30 |
| 21 Aug 2026 | 88.0% | 28 |
| 14 Aug 2026 | 88.5% | 28 |
| 7 Aug 2026 | 87.5% | 28 |
| 31 Jul 2026 | 85.9% | 27 |
| 24 Jul 2026 | 88.0% | 28 |
| 17 Jul 2026 | 90.6% | 29 |
| 10 Jul 2026 | 78.7% | 25 |
| 3 Jul 2026 | 83.3% | 26 |
| 26 Jun 2026 | 95.8% | 30 |