(MENAFN- The Rio Times) Brazil's inflation looks set to rise in September for a prosaic reason: August power bills were temporarily cheaper, and that discount ended.

The national consumer price index (IPCA) due Thursday, October 9, 2025, is expected to show roughly a half-point monthly increase and a firmer year-over-year rate-not because demand is booming, but because a one-off credit fell out of the math.

The story in one line: August featured a R$936.8 million ($176.8 million) Itaipu hydropower credit that lowered light bills. In September, that credit vanished while the electricity“tariff flag” that reflects generation costs stayed on the costlier red level 2.

That automatically lifted housing costs in the index. In October, the flag eases to red level 1, pointing to some relief. What those flags mean in practice: red level 2 adds R$7.87 per 100 kWh ($1.49); red level 1 adds R$4.46 ($0.84).

A household using 200 kWh would see the add-on fall from about R$15.74 ($2.97) to R$8.92 ($1.68) in October. The mid-September preview (IPCA-15) already hinted at this pattern: electricity prices jumped about 12% while food edged down, softening the blow.


Power Costs Distort Brazil's Inflation Pulse
The story behind the story: Brazil's inflatio is unusually sensitive to electricity because hydropower still dominates and regulators pass fuel and system costs through the flag mechanism.

When reservoirs run tighter or thermal plants run more, flags go up; when conditions improve, they come down. That makes monthly readings noisy-even when underlying inflation, driven by services like dining out, repairs, and rent, is moving more slowly.

Why readers outside Brazil should care: this is a case study in how regulated utility pricing can swing national inflation without signaling an overheating economy.

It matters for bonds, currency, and central-bank decisions: policymakers will look past the temporary electricity“payback,” but they'll stay cautious if services remain sticky.

What to watch next: the official September breakdown-how much of the bump is electricity versus services-and whether October's cheaper flag helps headline inflation decelerate on schedule.

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