Entry · Operation

Interchange with other countries

How much energy does the country exchange with its neighbors?

● checked against the primary source on Sep 30, 2026Source: ONS

Acronyms: SIN, National Interconnected System; ONS, National Electric System Operator.

In one sentence

Energy flow between the SIN and a neighboring country, measured as the sum of active power flows at the border frequency converters; positive is export from Brazil.

Real example

Net international interchange over 12 months (positive = export)

2,754,057 MWhNature of the data: Calculated

Sep 2025 to Aug 2026 · Brazil (SIN) with Argentina and Uruguay

Source: ONS, Intercâmbio do SIN com Outros Países. Reference up to Aug 2026. Captured on Sep 30, 2026.

Net interchange of the SIN with Argentina and Uruguay over 12 months; positive is export.

See in the panel: Grid: balance and abroad

Calculated: Deterministic transformation made by Scrutiniums, with a published formula.

Why it matters

The interchange of the South with neighboring countries is not in the dataset of borders between subsystems; without it, the energy accounts of the South and of the SIN are incomplete.

How it is measured

In MWavg, by hour and by country, in the ONS dataset “Intercâmbio do SIN com Outros Países”: Argentina through the Garabi I, Garabi II and Uruguaiana converters; Uruguay through Melo and Rivera; Paraguay through Acaray.

Unit: MWavg, by hour and country; positive is export

Not to be confused with

Interchange between subsystems
Interchange is the flow between subsystems of the SIN; international interchange is the flow between the SIN and a neighboring country, published in another dataset. Itaipu enters as the generation of a plant, not as interchange with Paraguay.

What cannot be concluded

Itaipu is published by the ONS as the generation of a plant, not as interchange with Paraguay.

Related entries

See in the panel

Where does the energy difference come from?

Official source

ONSData dictionary of the “Intercâmbio do SIN com Outros Países” dataset (version 1.2, May 4, 2026), accessed on Sep 30, 2026
Literal excerpt from the document
Portuguese only“As grandezas representam a soma das medidas de fluxo de potência ativa nas conversoras de frequência de fronteira entre os dois países. O intercâmbio com a Argentina pode ser realizado pelas conversoras de Garabi I, Garabi II e Uruguaiana. O intercâmbio com o Uruguai pode ser realizado pelas conversoras de Melo e Rivera. O intercâmbio com o Paraguai pode ser realizado pela conversora de Acaray.”
Literal excerpt from the document
Portuguese only“Dados positivos indicam exportação de energia do Brasil para outros países; dados negativos indicam importação de energia do Brasil de outros países.”

Documents accessed and text checked on Sep 30, 2026.