Paraguay controls 99% of Brazil's electricity import supply

98.9%. That is Paraguay's share of Brazil's electricity imports through the first four months of 2026, according to MDIC ComexStat data. Three partners show positive flow in the record. The other two combined account for barely 1%.

The headline figure is striking, but the story behind it is more structural than alarming. Brazil's imported electricity is almost entirely tied to Itaipu — the binational hydroelectric dam built under a 1973 treaty that fixes quotas, pricing and operational rules between the two countries. The HHI of 0.978, where 1.0 would be an absolute monopoly, reflects a deliberate bilateral arrangement, not a procurement failure.

Why the concentration exists

Itaipu's installed capacity of 14,000 MW is split evenly between Brazil and Paraguay. Brazil uses most of its share; Paraguay sells the bulk of its unused quota back to Brazil under terms set by the treaty. That contractual structure — not the open market — explains why the US$ 910.7 million in total chapter imports flows almost entirely through one corridor.

The rational case for concentration is clear: Itaipu energy is renewable, inexpensive by amortized cost, and geographically close to Brazil's southern and southeastern grid. The construction investment is fully paid off. What gets negotiated now is how to divide the surplus — and that is where the bilateral dynamic becomes politically charged.

Where the risk sits

The vulnerability does not disappear behind the rational framing. Three active partners and near-zero backup capacity means any disruption to Paraguayan supply — forced maintenance, drought-driven output cuts, or a bilateral negotiation breakdown — leaves Brazil without a near-term substitute at comparable volume.

The real pressure point is Annex C of the Itaipu Treaty. The original term expired in 2023. Negotiations over Paraguay's compensation for its unused energy quota remain unresolved in public. The outcome will set both the cost and the security of supply for the next two decades. Paraguay has signaled in various forums that it considers current compensation insufficient — and its leverage is growing as the surplus value of the dam becomes clearer.

Alternative routes

Argentina can export electricity to Brazil under specific conditions, but faces chronic domestic generation and distribution constraints. Uruguay's scale is smaller still. Domestically, Brazil's wind and solar build-out is gradually reducing the share of imported electricity in the national mix — which could, over a multi-year horizon, lower Paraguay's strategic weight as an external supplier. That shift plays out in years, not quarters.

For now, the practical reality is simple: no country in the region can absorb the Paraguayan volume at comparable price. The concentration is rational, but it is also a structural single point of failure. A drought year in the Paraná basin — which feeds Itaipu's reservoir — can simultaneously constrain both Brazilian and Paraguayan generation, removing even the partial buffer that the bilateral quota system otherwise provides.