The system is stronger now, but the real test comes with the rains.
Beneath the rhythms of daily life in Brazil, a drought has quietly reshaped the economics of the household — forcing the nation's electrical grid away from its rivers and toward costlier fires. The regulator Aneel has confirmed what many consumers already feel in their bills: the red tariff flag, carrying an added charge of R$4.46 per 100 kilowatt-hours, will almost certainly persist through December as thermal plants compensate for depleted reservoirs. A R$9 billion reserve fund offers partial shelter, and the grid is more resilient than it was during the crisis of 2021 — but the deeper question, as always, belongs to the rain.
- Brazil's worst drought on record has starved hydroelectric dams and forced the grid onto expensive thermal power, pushing electricity bills higher for millions of households.
- The red tariff flag — already active at its first level in September — is expected to hold or drop only to yellow through December, with no relief in sight before year-end.
- A R$9 billion reserve built from past surcharges could absorb some thermal costs and prevent the situation from escalating further, acting as a financial shock absorber.
- Unlike the 2021 water crisis, the grid now carries more diversified renewable capacity, giving officials cautious confidence that the system can hold without emergency measures.
- The real danger lies beyond 2024 — if the rainy season arrives late or falls short, energy officials warn the crisis could deepen sharply into 2025.
Brazil's electricity bills will remain elevated through the end of 2024. Sandoval Feitosa, director-general of the national electricity regulator Aneel, confirmed this week that the red tariff flag — which adds R$4.46 to every 100 kilowatt-hours consumed — will almost certainly stay in place through December, dropping at best to yellow. The cause is a historic drought that has gutted hydroelectric generation and forced the grid to lean on far more expensive thermal power plants.
Feitosa laid out the mechanics at a national energy seminar in Brasília: the tariff flag system anticipates future costs and adjusts monthly based on dozens of variables. When reservoirs fall and thermal plants fire up, consumers absorb the difference. The system is functioning as designed — but that offers little comfort to households watching their bills climb.
One potential buffer exists. The Tariff Flag Account, a reserve built from previous surcharges, holds roughly R$9 billion and could help offset thermal costs in the months ahead, softening the impact without eliminating it. Feitosa also drew a careful distinction from 2021, the last major water crisis, noting that years of investment in renewable energy have since diversified the grid, giving the system more resilience than it had then.
For now, reservoirs sit near 50 percent capacity — enough to provide some stability through the dry season's end. But the real uncertainty belongs to the rainy season ahead. If rainfall arrives late or below historical averages, the strain could extend well into 2025. That is the scenario energy officials are watching most closely: not the drought already underway, but the one that may follow if the skies don't deliver.
Brazil's electricity bills are going to stay expensive through the end of the year. That's the word from Sandoval Feitosa, the director-general of Aneel, the country's electricity regulator, who said this week that the red tariff flag—the system that charges consumers extra when energy costs spike—will almost certainly remain in place or drop at best to yellow through December. The culprit is a severe drought that has crippled hydroelectric generation across the country, forcing the grid to rely on costlier thermal power plants to keep the lights on.
Right now, in September, the red flag is already active at its first level, adding R$4.46 to every 100 kilowatt-hours of electricity consumed. Feitosa explained the mechanics during a national energy consumer seminar in Brasília: the tariff system is designed to anticipate future costs and adjust charges month to month based on a complex equation involving dozens of variables. When hydroelectric dams run low and thermal plants must be fired up, those extra costs get passed to consumers. The system is working as intended, but that doesn't make the bills any smaller.
There is one potential cushion. Brazil's Tariff Flag Account—a reserve fund built up from previous surcharges—currently holds about R$9 billion. Feitosa suggested this money could help absorb some of the thermal generation costs in the coming months, potentially softening the blow of the red flags. The account functions as a kind of shock absorber: when tariffs are high, extra revenue flows in; when the system needs relief, that money flows back out to subsidize costs. It's not a permanent fix, but it might prevent the situation from getting worse.
Comparisons to 2021, the last time Brazil faced a severe water crisis, offer some reassurance. That year was genuinely alarming—the government had to hold emergency auctions to contract thermal capacity and created an extraordinary tariff tier for water scarcity. Feitosa noted that despite this year's drought being the worst on record, the overall health of the electrical system is stronger now. Two years of green tariff flags—meaning cheap power and falling reservoir levels—have been followed by investments in renewable energy that have diversified the grid away from pure hydroelectric dependence. The system has more tools now than it did three years ago.
Still, the near-term picture is tight. Hydroelectric reservoirs are sitting around 50 percent capacity on average, which Feitosa said provides some comfort through the end of the dry season. But comfort is a relative term. The real test comes with the rainy season. If rainfall arrives late or falls short of historical averages, the situation could deteriorate sharply into 2025. That's the scenario keeping energy officials awake: not this year's drought, which is manageable, but next year's potential water shortage if the rains don't come as expected. For now, Brazilians should expect their electricity bills to remain elevated through year-end, with the possibility of improvement only if the weather cooperates.
Notable Quotes
There is a strong tendency for the tariff flag to remain between red and yellow through year-end, as the system must account for future costs and many complex variables.— Sandoval Feitosa, director-general of Aneel
While this year's drought is climatically more severe, the electrical system is qualitatively and quantitatively much better than it was in 2021, thanks to growth in renewable energy sources.— Sandoval Feitosa
The Hearth Conversation Another angle on the story
Why does a drought in one part of the country affect everyone's electricity bill?
Because Brazil's power grid is still heavily dependent on hydroelectric dams. When water levels drop, the system has to switch on thermal plants—coal, gas, oil—which are much more expensive to operate. Those costs get spread across the entire customer base through the tariff flag system.
So the R$9 billion reserve—that's basically money the government saved from charging people extra before?
Exactly. It's not new money. It's accumulated surcharges from previous months when thermal plants were running. The system is designed to smooth out these shocks, but it only works if you have a reserve built up. In this case, they do, which is why Feitosa thinks it can help.
He said this year's drought is worse than 2021, but the system is less fragile. How is that possible?
The grid has changed. Two years ago they had green flags—cheap power, stable reservoirs. That gave them time to invest in wind and solar. So even though the drought is more severe climatically, the system has more flexibility. It's not as dependent on one source.
What happens if the rain doesn't come in the wet season?
Then 2025 becomes the real crisis. Right now they're managing because reservoirs are at 50 percent and the dry season is ending soon. But if the rains are late or weak, those reservoirs stay low heading into next year's dry season. That's when you could see genuine strain.
Are people angry about the bills?
The source doesn't say, but you can imagine. Brazilians are already dealing with inflation and tight household budgets. An extra R$4.46 per 100 kilowatt-hours doesn't sound like much until you multiply it across millions of homes for six months straight.