Marco Três Border Bulletin: September 2026

The dollar exchange rate in September 2026 averaged R$ 5.14, with a low of R$ 5.09 and a high of R$ 5.22, according to Marco Três (AwesomeAPI data).

Iguaçu River Flow

The average flow measured at the Hotel Cataratas station was 5,244 m³/s, with a peak of 10,107 m³/s. There were 7 days above 6,500 m³/s, a level that usually triggers the preventive closure of the Devil's Throat in the Argentine park. The typical long-term average flow of the river is ~1,500 m³/s, meaning the month ran with the river 250% fuller than normal.

Passengers at Foz Airport

In September 2026 Foz Airport handled 228,021 passengers, a 36.3% increase over the same month in 2025, according to ANAC data.

Fuel Prices

Regular gasoline in Foz cost R$ 6.45 per liter (ANP). In Argentina, the equivalent fuel cost R$ 7.76 per liter, calculated with the blue-dollar rate, making fueling 20% more expensive in Argentina.

Itaipu Generation

The Itaipu plant generated an average of 237.1 GWh per day in September 2026 (ONS). Each GWh equals the daily consumption of roughly 200,000 households, so the energy produced corresponds to the daily consumption of about 47.4 million homes – most of it goes to Brazil’s National Interconnected System, while almost all of Paraguay’s consumption is covered by its share.

What this means for you:

• The dollar is stable but still above R$ 5.00, so plan foreign-currency expenses carefully.
• The river is far above normal; if you plan to visit the Devil's Throat, check the park’s opening status before you go.
• The rise in passengers indicates higher tourist flow; expect longer lines at airport services.
• Fueling in Argentina is more expensive; consider filling up in Foz before crossing the border.
• Itaipu’s energy is mainly used outside the border region; there is no direct impact on power supply for Foz or Ciudad del Este.

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Monthly bulletin generated from Marco Três open-data series (official sources: ANA, ANAC Brazil and Argentina, ANP, Secretaría de Energía AR, Comex Stat/MDIC, ONS, AwesomeAPI). Reusable data with credit — open data.