The cheapest place in Brazil to go solar is in the Amazon
Ao longo do último ano, o Brasil assistiu a uma queda de sete por cento no custo de instalação de energia solar, com a média nacional chegando a R$2,45 por watt-pico — um sinal de que a transição energética não é apenas uma promessa, mas um processo em curso. O que os dados do Radar Solfácil revelam vai além dos números: é o Norte e o Nordeste do país, historicamente à margem do desenvolvimento industrial, que agora lideram o caminho para a energia mais barata. A Amazônia, símbolo de recursos naturais disputados, torna-se também o lugar mais acessível para capturar a energia do sol.
- A queda de 7% no preço da energia solar em um único ano pressiona o mercado a se adaptar rapidamente, encurtando o prazo de retorno do investimento para consumidores e empresas.
- A disparidade regional é aguda: enquanto o Acre instala painéis a R$2,08/Wp, outras regiões ainda pagam significativamente mais, criando um Brasil solar de duas velocidades.
- Estados do Norte e Nordeste — Acre, Rondônia, Amazonas, Paraíba e Alagoas — emergem como os novos polos de acessibilidade solar, desafiando a lógica de que o desenvolvimento energético segue os centros industriais.
- A barreira do custo inicial, que historicamente manteve a energia solar fora do alcance de muitos brasileiros, começa a ceder, ampliando o universo de potenciais adotantes.
- A trajetória de queda de preços, se mantida, pode redesenhar a infraestrutura energética do país — mas se o ritmo vai continuar ou desacelerar ainda é uma questão em aberto.
O custo de instalar energia solar no Brasil caiu sete por cento em um ano, com a média nacional chegando a R$2,45 por watt-pico, segundo o monitoramento trimestral do Radar Solfácil. A queda representa uma mudança real na equação econômica de adotar energia renovável — embora o movimento não seja uniforme em todo o território.
A geografia da acessibilidade conta uma história própria. Os três estados mais baratos para instalação solar estão no Norte: Acre lidera com R$2,08/Wp, seguido por Rondônia (R$2,17/Wp) e Amazonas (R$2,18/Wp). No Nordeste, Paraíba e Alagoas completam o grupo dos cinco mais acessíveis. Mato Grosso, Roraima, Mato Grosso do Sul, Paraná e Amapá fecham o ranking dos dez estados com menores custos, todos abaixo de R$2,37/Wp.
Essas diferenças regionais refletem fatores como custo de mão de obra, densidade de empresas instaladoras, logística e competição local. Regiões menos industrializadas, paradoxalmente, tornaram-se os maiores polos de energia solar acessível do país.
A redução de preços importa porque ataca diretamente a principal barreira à adoção: o investimento inicial. Com o prazo de retorno se encurtando, a energia solar deixa de ser privilégio e aproxima-se de uma escolha viável para um número crescente de brasileiros. Em 2026, o lugar mais barato do Brasil para ir ao solar é a Amazônia.
Across Brazil, the cost of installing solar panels dropped seven percent over the past year, making renewable energy more accessible to households and businesses willing to harness the sun. The decline, tracked by Radar Solfácil—a quarterly monitor of photovoltaic system prices—shows the national average settling at two reais and forty-five centavos per watt-peak, the standard unit measuring a solar panel's power output. That figure represents a meaningful shift in the economics of going solar, though the story is not uniform across the country.
The geography of affordability tells its own tale. Three northern states—Acre, Rondônia, and Amazonas—have emerged as the cheapest places to install solar systems. Acre leads the pack at two reais and eight centavos per watt-peak, followed by Rondônia at two reais and seventeen centavos, and Amazonas at two reais and eighteen centavos. All three sit well below the national average, a gap that reflects differences in labor costs, supply chains, and local market competition. The northeastern state of Paraíba rounds out the top five most affordable regions at two reais and twenty-five centavos per watt-peak, with neighboring Alagoas just behind at two reais and twenty-six centavos.
The full ranking of the ten cheapest states reveals a pattern: the less industrialized regions of Brazil, particularly those in the north and northeast, have become the country's solar bargains. Mato Grosso and Roraima tie at two reais and twenty-nine centavos each. Mato Grosso do Sul, Paraná, and Amapá round out the top ten, all hovering between two reais and thirty-three centavos and two reais and thirty-six centavos per watt-peak. The data suggests that as solar technology matures and supply chains deepen, prices are not falling evenly—some regions are pulling ahead faster than others.
What drives these regional differences remains implicit in the numbers themselves. Installation costs depend on labor availability, the density of competing solar companies, transportation distances, and local demand. States with fewer established solar installers may have lower overhead, while those with robust competition may be pushing prices down through market pressure. The northern states' advantage could also reflect lower labor costs and less congested supply networks, allowing installers to pass savings to customers.
The seven-percent annual decline matters because it removes a barrier to adoption. Solar energy has long promised environmental benefits and long-term savings, but the upfront capital requirement kept it out of reach for many Brazilians. As prices fall, the payback period shortens, and the financial case for going solar strengthens. The data from Radar Solfácil suggests this trend is accelerating, at least in pockets of the country. Whether the price declines will eventually level out, or whether competition and scale will continue driving costs down, remains to be seen. What is clear is that in 2026, the cheapest place in Brazil to go solar is in the Amazon.
Citações Notáveis
The price of solar energy fell 7% in one year, comparing the first quarter of 2026 to the same period in 2025— Radar Solfácil quarterly monitoring report
A Conversa do Hearth Outra perspectiva sobre a história
Why does Acre cost so much less than other states? Is it just labor?
It's probably several things at once—lower wages, sure, but also less competition among installers, shorter supply chains, and maybe less regulatory overhead. When there are fewer established solar companies, the ones that do operate can keep margins tighter.
So the northern states are winning by accident, not by design?
Not entirely by accident. Some of it is structural—they have lower costs of living, less developed infrastructure means fewer middlemen. But there's no evidence here of a deliberate policy to make solar cheaper in the north.
If prices keep falling at this rate, when does solar become the default choice?
That depends on what "default" means. At two reais per watt-peak, the payback period is getting short enough that it makes financial sense for many people. But adoption also depends on access to credit, roof space, and whether people trust the technology.
The article doesn't mention the most expensive states. Why is that important?
Because the gap tells you something about market fragmentation. If some states are paying fifty percent more than others for the same technology, that's a sign the market isn't fully integrated. It suggests opportunity—and also inefficiency.
Does this seven percent drop mean solar is now cheaper than grid electricity?
The article doesn't compare it to grid rates, so we can't say. Cost per watt-peak is just the installation price. You'd need to factor in financing, maintenance, and how much sun the region actually gets to know if it's cheaper than buying from the utility.
What happens to the solar companies in expensive states?
That's the real question. If customers in São Paulo are paying fifty percent more than customers in Acre for the same system, either the expensive-state companies will have to cut costs or they'll lose market share to cheaper competitors. Consolidation or collapse—one or the other.