BOA ESPERANÇA
Piauí · PARNAIBA
Capacity
5,085 hm³
Coordinates
-6.751°N, 43.568°W
Operator
ONS
80.9% full
Current fill
80.9%vs 7 days ago
-1.5%losing
vs 1 year ago
-3.1%year-over-year
7-day trend
→stable
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Technical specifications
| Total capacity | 5,085 hm³ |
| Usable capacity | 1,912 hm³ |
| Primary use | Hydroelectric |
| Operator | ONS |
| River | PARNAÍBA |
| Province | Piauí |
| River basin | PARNAIBA |
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. -6.751, -43.568 · Open in Google Maps
About BOA ESPERANÇA
As of July 28, 2026, BOA ESPERANÇA is filled to 80.9% of its total capacity, holding roughly 1,546 hm³ of water out of a maximum 5,085 hm³. At this level the reservoir is high. Of that total, about 1,912 hm³ is usable (live) storage.
Over the most recent week on record the fill level has held broadly steady (-1.5 pts), and it is 3.1 points below its level on the same date a year earlier.
Across the readings we hold for BOA ESPERANÇA — 52 data points between August 15, 2025 and July 28, 2026 — the level has ranged from a low of 22.7% (December 5, 2025) to a high of 100.0% (May 1, 2026). On average the reservoir is fullest around May and at its lowest around November.
It is operated by ONS primarily for hydroelectric power. It lies within the PARNAIBA basin at 6.751°S, 43.568°W.
Key facts
- Current fill level
- 80.9%
- Water stored
- 1,546 hm³
- Total capacity
- 5,085 hm³
- Usable capacity
- 1,912 hm³
- 7-day change
- ▼ 1.5 pts
- Year-on-year
- ▼ 3.1 pts
- Primary use
- Hydroelectric power
- River
- PARNAÍBA
- River basin
- PARNAIBA
- Operator
- ONS
- Coordinates
- 6.751°S, 43.568°W
- Last updated
- July 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Jul 2026 | 80.9% | 1,546 |
| 24 Jul 2026 | 82.3% | 1,574 |
| 17 Jul 2026 | 85.6% | 1,636 |
| 10 Jul 2026 | 88.0% | 1,682 |
| 3 Jul 2026 | 90.0% | 1,720 |
| 26 Jun 2026 | 92.2% | 1,762 |
| 19 Jun 2026 | 94.5% | 1,807 |
| 12 Jun 2026 | 95.9% | 1,834 |
| 5 Jun 2026 | 96.5% | 1,845 |
| 29 May 2026 | 96.5% | 1,845 |
| 22 May 2026 | 96.3% | 1,841 |
| 15 May 2026 | 96.5% | 1,845 |
Frequently asked questions
What is the current water level of BOA ESPERANÇA?
As of July 28, 2026, BOA ESPERANÇA is at 80.9% of its capacity, holding approximately 1,546 hm³ of water, according to ONS – Operador Nacional do Sistema Elétrico data.
Is BOA ESPERANÇA reservoir full?
No. As of July 28, 2026, BOA ESPERANÇA is high at 80.9% of its capacity, so it is not full.
Is the water level at BOA ESPERANÇA rising or falling?
The level at BOA ESPERANÇA has been broadly stable over the latest week on record (-1.5 points).
How much water can BOA ESPERANÇA hold?
BOA ESPERANÇA has a total capacity of 5,085 hm³, of which about 1,912 hm³ is usable storage.
Where is BOA ESPERANÇA reservoir located?
BOA ESPERANÇA is located in Piauí, Brazil, within the PARNAIBA basin (coordinates 6.751°S, 43.568°W).
What is BOA ESPERANÇA used for?
BOA ESPERANÇA is used primarily for hydroelectric power, and is managed by ONS.