Abundance and high prices at the same time
Em um país abençoado com reservatórios razoavelmente cheios e capacidade renovável excedente, o Brasil se prepara para pagar mais pela eletricidade — não por escassez real, mas pela lógica interna de um modelo de precificação que enxerga perigo onde há abundância. O El Niño, ao secar o Norte e o Nordeste, serve de gatilho para as bandeiras tarifárias vermelhas que pesarão sobre as contas das famílias de junho a setembro de 2026. É uma história antiga sobre como os sistemas criados para proteger podem, por sua própria cautela excessiva, tornar-se fontes de injustiça.
- O El Niño promete uma seca prolongada no Norte e Nordeste, e os analistas já projetam bandeira vermelha nível 2 de julho a setembro — o patamar mais caro para o consumidor.
- A conta de luz deve subir 9% ao longo do ano, repetindo o padrão de 2025, quando a energia elétrica residencial foi a maior vilã da inflação, com alta de 12,31%.
- Especialistas apontam que o verdadeiro problema não é a falta de água nos reservatórios — que estão em níveis adequados no Sudeste e Centro-Oeste —, mas um modelo de precificação excessivamente conservador e mal calibrado.
- O paradoxo é gritante: o Brasil desperdiça 20% de toda a geração solar e eólica possível, cortando energia barata para evitar sobrecargas, enquanto cobra tarifas de escassez de quem mais precisa.
- Famílias de menor renda, que destinam parcela maior do orçamento às contas de energia, são as mais expostas à erosão do poder de compra — e o governo reconhece o custo político da situação.
O sistema elétrico brasileiro entra em uma temporada cara. Com o fim das chuvas em abril, a transição para o período seco já está em curso — e o El Niño, ao aquecer as águas do Pacífico e reduzir as precipitações no Norte e Nordeste, deve manter a bandeira tarifária vermelha acionada por mais tempo do que em 2025. A projeção de economistas é clara: bandeira vermelha nível 1 em junho, escalando para nível 2 de julho a setembro, com recuo apenas quando as chuvas voltarem em outubro. O efeito acumulado deve ser uma alta de 9% nos preços da eletricidade ao longo do ano.
Os reservatórios, porém, contam uma história mais nuançada. O Sudeste e o Centro-Oeste operam com cerca de 65% da capacidade, o Sul está em 46% e pode enfrentar pressão real, enquanto Norte e Nordeste estão praticamente cheios. Pela lógica convencional, o sistema teria água suficiente para gerar energia sem medidas emergenciais. Ainda assim, as tarifas sobem — e especialistas apontam cada vez mais para o modelo de precificação como o verdadeiro culpado. Segundo análises de associações de consumidores industriais e da consultoria Thymos Energia, o arcabouço matemático que define as tarifas é excessivamente conservador e mal calibrado, sinalizando escassez onde não há.
O impacto chega direto ao bolso. Em 2025, a energia elétrica residencial subiu 12,31%, tornando-se o maior componente individual da inflação ao consumidor. O governo tentou amortecer o golpe com R$ 2,2 bilhões em descontos tarifários, mas a pressão estrutural permanece — e recai com mais força sobre as famílias de menor renda, que comprometem fatia maior do orçamento com serviços de utilidade pública.
Há ainda um paradoxo que desafia a racionalidade do sistema: o Brasil gera mais eletricidade do que consome. O excesso é tão pronunciado que o operador da rede precisa desligar usinas solares e eólicas para evitar sobrecargas. Em 2025, cerca de 20% de toda a geração renovável potencial foi cortada, custando ao setor aproximadamente R$ 6,5 bilhões em receita perdida. O país, portanto, descarta energia barata e limpa enquanto cobra tarifas de escassez — uma contradição que não serve nem às finanças do setor elétrico nem ao orçamento das famílias.
Brazil's electricity system is heading into an expensive season. As the rainy months ended in April, the country's power grid began preparing for the dry stretch ahead—a transition that will almost certainly mean higher bills for millions of households. The culprit is El Niño, the Pacific weather pattern that warms ocean waters and starves the North and Northeast of rainfall. This year, forecasters expect the red tariff flag—the highest cost tier—to stay raised far longer than it did in 2025.
The math is straightforward. In May, the National Electric Energy Agency confirmed the yellow flag, a step up from the green rates that held through the first months of 2026. By June, analysts expect the red flag to arrive and stay through September. One chief economist at Banco BMG projects red level 1 starting in June, escalating to red level 2 from July through September, before easing back down when rains return in October. The cumulative effect: electricity prices are expected to rise 9 percent across the year, with the steepest increases hitting during the dry season months.
Reservoir levels tell a more complicated story. The Southeast and Center-West subsystems, which serve the bulk of Brazil's population, are holding at about 65 percent capacity. The South is lower, at 46 percent, and could face real strain depending on rainfall. The Northeast and North are nearly full. By conventional logic, this should mean the system has enough water to generate power without emergency measures. Yet the tariff flags keep climbing, and economists are increasingly pointing not to actual scarcity but to how the system calculates prices.
The pricing model itself has become the focus of scrutiny. Victor Hugo Iocca, who directs electricity affairs for a major industrial consumers' association, argues that the mathematical framework used to set rates is overly conservative. When the dry season arrives, that conservatism becomes even more pronounced, pushing prices higher regardless of whether the system actually needs the signal. A separate analysis by Thymos Energia, examining data from the National Electric System Operator, found a significant gap between how the system actually operates and what the pricing signals suggest. The researchers concluded that the coming months will see elevated prices not because reserves are genuinely low, but because the model's calibration is flawed.
This matters for inflation and household budgets. Last year, residential electricity rose 12.31 percent, making it the single largest contributor to Brazil's consumer price index. The government tried to cushion the blow with 2.2 billion reais in tariff discounts funded by a hydroelectric facility, but the underlying pressure remains. As purchasing power erodes, particularly for lower-income households that spend a larger share of their income on utilities, the political cost rises too. The government has made clear it views high electricity bills as a threat to public confidence.
There is another paradox at work. Brazil's power system currently generates more electricity than it consumes. The excess capacity is so pronounced that the grid operator must regularly shut down renewable sources—solar and wind farms—to prevent overloads that could trigger blackouts. Last year, about 20 percent of all potential solar and wind generation was curtailed, costing the renewable energy sector roughly 6.5 billion reais in lost revenue. So the country is simultaneously cutting off cheap renewable power while charging consumers premium rates based on a pricing model that assumes scarcity. The system is protecting itself from abundance by making electricity expensive, a logic that satisfies neither the grid's financial health nor the household budget.
Citas Notables
The price high happens because our model uses very conservative mathematical standards. That's the core issue. Once we enter the dry season, that conservative model becomes even more worried.— Victor Hugo Iocca, director of electricity affairs for the Brazilian Association of Large Energy Consumers
The coming months should show elevated prices because of poor calibration of the pricing model, not because of an actual need for the system to signal low reserves.— João Carlos Mello, CEO of Thymos Energia
La Conversación del Hearth Otra perspectiva de la historia
Why does El Niño in the Pacific matter so much to someone paying an electricity bill in São Paulo?
El Niño shifts rainfall patterns. It dries out the North and Northeast, which means less water flowing into the hydroelectric dams that generate most of Brazil's power. When water is scarce, the system has to rely on more expensive thermal plants, and the tariff flags rise to signal that cost.
But the article says reservoirs are actually fairly full right now. So why are prices going up?
That's the real puzzle. The system has enough water. The problem is the pricing model itself—it's built with very conservative assumptions. Once the dry season starts, those assumptions get even more cautious, and prices climb even if there's no actual shortage.
So the model is essentially crying wolf?
Not quite. It's more that the model was designed to be protective, to ensure the system never runs dry. But that protection has a cost, and households pay it whether the danger is real or not.
The article mentions that Brazil is actually cutting off renewable energy—solar and wind—while raising electricity prices. How does that make sense?
The grid has too much power right now. If it doesn't cut something, the system overloads. So it shuts down the cheapest sources—renewables—to maintain balance. Meanwhile, the pricing model signals scarcity and raises rates. You end up with abundance and high prices at the same time.
Who loses in this scenario?
The renewable energy companies lose directly—6.5 billion reais in curtailed generation last year. But households lose too, through higher bills. And the government loses politically, because people feel poorer even though the system isn't actually starving for power.