# ONS forecast points to above-average October inflows in southern Brazil

> The operator expects strong water inflows in the South and Southeast/Centre-West, while North and Northeast projections remain below average.

- **Source date:** 2026-10-05
- **Original source:** [Agência Cenário Energia](https://cenarioenergia.com.br/2026/10/05/ons-aponta-afluencia-superior-media-sul-sudeste-outubro/)
- **Reading time:** 1 min
- **Language:** en
- **URL:** https://voltformer.com/news/ons-october-hydrology-forecast-south-brazil-october-2026
- **Markdown:** https://voltformer.com/news/ons-october-hydrology-forecast-south-brazil-october-2026.md

## A wet September lifts southern inflow projections

A 5 October report on ONS’s weekly operating outlook said natural inflows for October were projected at 244% of the long-term average in the South and 128% in the Southeast/Centre-West. Forecasts were lower in the Northeast at 66% and in the North at 48%. ONS linked the stronger southern outlook to September’s highest rainfall across the system in 17 years.

[Agência Cenário Energia](https://cenarioenergia.com.br/2026/10/05/ons-aponta-afluencia-superior-media-sul-sudeste-outubro/)

## Storage remains uneven across regions

Projected end-of-month reservoir storage was 86.9% in the South, 56.3% in the Southeast/Centre-West, 63.6% in the Northeast and 62.5% in the North. The same outlook put October system load growth at 4.7% year on year. These are operational forecasts from ONS’s weekly programme, not final measured October results.

[Agência Cenário Energia](https://cenarioenergia.com.br/2026/10/05/ons-aponta-afluencia-superior-media-sul-sudeste-outubro/)

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